Some historians think that drinking wine from lead-glazed vases contributed to the fall of the Roman Empire.
What is wine and ancient Rome?Rome played a significant role in the history of wine. The first people to have an impact on winemaking on the Italian peninsula were the ancient Greeks and Etruscans.
Scientific advancements and an expanding understanding of winemaking were both brought about by the expansion of the Roman Empire. Rome had a significant impact on the history of today's important wine-producing regions in France, Germany, Italy, Portugal, and Spain.
Because the Romans believed that wine was a daily necessity, the beverage was "democratic" and widely available to everyone, including slaves, peasants, and aristocrats, both men and women. To ensure a consistent supply of wine for Roman soldiers and colonists, viticulture and wine production spread throughout the empire.
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Calculate the density of a fluid that has a mass of 100 grams and a volume of 97.18 cm3. Use a calculator if necessary.
Answer:
Density = mass÷volume (g/cm³)
= 100÷97.18
= 1.029
= 1.03 g/cm³ (3 significant figures)
this reaction is first order with respect to reactant a and second order with respect to reactant b. if the concentration of a is doubled and the concentration of b is halved, the rate of the reaction would by a factor of .
The rate of reaction will reduce by a factor of ½ when the concentration of A and B is doubled and halved respectively.
The reaction rate or rate of reaction is the rate at which a chemical reaction occurs, defined as proportional to the rise in product concentration per unit time and the reduction in reactant concentration per unit time. Chemists calculate reaction rates by initiating the reaction, evaluating the concentration of the product or reactant at various time points throughout the reaction, occasionally charting the concentration as a function of the time on a graph, and then computing the alteration in concentration per unit time. The rate of reaction may be calculated by calculating the amount of product created in a given amount of time. The time period used may be determined by the rate of the reaction.
Reaction:
[tex]A + 3B \rightarrow 2C + D[/tex]
Reaction rate is given as:
Rate = [tex]K [A][B]^2[/tex]
First order:
Rate (1) = [tex]K [A][B]^2[/tex]
When the concentrations of A and B is doubled and halved respectively:
Rate (2) = [tex]K [2A][B/2]^2[/tex]
Rate (2) = 2 [tex]\frac{K [A][B]^2}{4}[/tex]
Rate (2) = ½ [tex]K [A][B]^2[/tex]
Therefore, the rate of reaction will reduce by a factor of ½.
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The electron configuration of an element is 1s22s22p6. Describe what most likely happens when an atom of this element comes near an atom having seven valence electrons.
Answer: Nothing will happen
Explanation:
Elements want to fill their valence shell with electrons (8).
Referring to both of the table below we will know that the element with that electron configuration is Neon (Ne). It is on the far right side of the periodic table so it contains all 8 electrons in its valence shell. The elements on the right side of the periodic table are called noble gases and are not reactive because they have the maximum number of electrons.
A single electron from the outermost shell of this element will move into the outermost shell of the atom with seven electrons.Nothing will happen in these state.
What is an electronic configuration ?Electron configurations define the arrangement of electrons around an atom's nucleus. Lithium, for instance, contains two electrons in the 1s subshell and one electron in the 2s subshell, according to its electron configuration, 1s22s1.
We may determine that Neon is the element with that electron configuration by looking at both of the tables below (Ne). It has all 8 electrons in its valence shell since it is on the extreme right side of the periodic table.
Noble gases are the elements on the right side of the periodic table that contain the most electrons and are thus non-reactive.
Thus, Electronic configuration an element is 1s22s22p6, it is stable.
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The question is in the photo✨✨✨(Sorry) In the answer: Please leave all the numbers after the decimal point
36.2L of N2 can be produced.
1st) According to the stoichiometry of the reaction, 2 moles of NaN3 produce 3 moles of N2. Using the molar mass of NaN3 (65.0g/mol ) and N2 (28.0g/mol) we can convert the moles to mass, and we can see that with 130.0g of NaN3 we can produce 84.0g of N2.
Now, we can use a mathematical rule of three to calculate the grams of N2 that can be produced from 71.0g of NaN3:
[tex]\begin{gathered} 130.0gNaN_3-84.0gN_2 \\ 71.0gNaN_3-x=\frac{71.0gNaN_3\cdot84.0gN_2}{130.0gNaN_3} \\ x=45.9gN_2 \end{gathered}[/tex]So, 45.9g of N2 are produced from 71.0g of NaN3.
2nd) It is necessary to convert the grams of N2 produced to moles, so we can use it in the Ideal gas equation:
[tex]\begin{gathered} 28.0gN_2-1mol \\ 45.9gN_2-x=\frac{45.9gN_2\cdot1mol}{28.0gN_2} \\ x=1.6\text{mol} \end{gathered}[/tex]Now we know that 1.6mol of N2 are produced.
3rd) To calculate the volume of N2, it is necessary to use the Ideal gas equation and replace the values of Pressure (P), Temperature (T, in Kelvin) and Number of moles (n):
[tex]\begin{gathered} P\mathrm{}V=n\mathrm{}R\mathrm{}T \\ 1.30\text{atm}\cdot V=1.6\text{mol}\cdot0.082\frac{atm\cdot L}{mol\cdot K}\cdot359K \\ V=\frac{1.6mol\cdot0.082\frac{atm\cdot L}{mol\cdot K}\cdot359K}{1.30\text{atm}} \\ V=36.2L \end{gathered}[/tex]Finally, 36.2L of N2 can be produced from 71.0g of NaN3.
Particle
Proton
Neutron
Electron
Charge
A =
+1
0
-1
Location
Nucleus
Nucleus
Orbitals
Approximate
mass (amu)
1
1
0
Made of
quarks?
A
B
00
C
Complete the table to summarize the properties of the different subatomic particles by typing in "yes" or
"no."
Charge on neutron, proton and electron is 0,1,-1 respectively, proton and neutrons are in nucleus while electron are in orbitals, the mass of electron is nearly 0 while mass of proton and neutron is 1 amu and only proton and neutrons are made up of quarks.
Electron, neutron and proton, all three are sub-atomic particles.
The charge on Neutron is 0.
The charge on Electron is -1.
The charge on Proton is +1.
Protons and neutrons are found inside the nucleus because they only are forming the nucleus, this is why they are also called Nucleons.
The electrons are found in the orbitals.
Approximate mass of Proton and Neutron is 1 amu. But the electron is very very light as compared to electron. So, we can assume it to be zero.
Protons and Neutrons are made up of Quarks but electron is not made up of quark.
Electron and Quarks are the fundamental particle in an atom.
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Which of the following statements correctly explains why physical properties of a substance can be used to separate mixtures?
( HELP NEEDED ASAP!!!! )
When substances are mixed together, they retain their physical properties.
Mixtures contain different substances with different properties and chemists can separate one item from the mixture by forcing it to undergo a chemical change.
When substances are mixed together, the mixture assumes the physical properties of each individual substance.
When substances are mixed together, you can see each individual component.
The statements that correctly explains the use of physical properties of a substance to separate mixtures are
Statement 1: When substances are mixed together, they retain their physical properties.
Statement 3: When substances are mixed together, the mixture assumes the physical properties of each individual substance.
Mixtures are compounds that are made up of two or more chemical compounds which are not linked to each other chemically. They can be easily separated as there are no chemical reaction between each other.
Mixtures are compounds that retain their respective physical properties even though they were mixed together as there are no reaction between the two. Thus, these physical properties can be used to separate mixtures. Example: Oil in water. They have different densities. Thus, oil will float on water. We can exploit this physical property and separate them using separating funnel.
Mixtures contain different substances with different properties and chemists cannot separate one item from the mixture by forcing it to undergo a chemical change as there is no chemical reaction.
When substances are mixed together, you can see each individual component. But without knowing their property, we cannot separate them
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at the end of a reaction how much mass is present compared to the start of a reaction (if all products are captured) ?
Answer:At the end of chemical reactions, the total mass of the reatants compared to the total mass of the products - c) the mass is the same. Reason : all chemical reactions follow law of conservation of mass which states that mass of reactants and products remains the same
Explanation:hope this help <3
how does the octet rule explain the formation of a calcium ion? how does the octet rule explain the formation of a calcium ion? by losing two valence electrons from the fourth energy level, calcium achieves an octet in the third energy level so it attains [kr] electron configuration. by gaining two valence electrons into the fourth energy level, calcium achieves an octet in the fourth energy level. by losing two valence electrons from the fourth energy level, calcium achieves an octet in the third energy level so it attains [ne] electron configuration. by losing two valence electrons from the fourth energy level, calcium achieves an octet in the third energy level.
Group 2 of the periodic table places calcium, or Ca, which has two electrons on its outermost shell. Calcium must lose these two outermost electrons, also known as valence electrons, in order to have a full octet. Ionic compounds will be created when calcium reacts with nonmetals.
What is the octet rule rule?The octet rule describes an atom's propensity to prefer eight electrons in its valence shell. Atoms with fewer than eight electrons are more likely to interact with one another and create more stable compounds.Group 2 of the periodic table places calcium, or Ca, which has two electrons on its outermost shell. Calcium must lose these two outermost electrons, also known as valence electrons, in order to have a full octet. Ionic compounds will be created when calcium reacts with nonmetals.Only the main group elements are subject to the octet rule. The octet rule is known to be followed by the molecules of carbon, oxygen, nitrogen, and halogens. The s-block elements are typically among the elements that follow this rule.To learn more about : Octet rule
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a 1.00 g sample of gas occupies 250 ml at 273 k and 1.00 atm. calculate the molar mass of the gas. multiple choice question. 89.7 g/mol 24.9 g/mol 1.12 × 10–2 g/mol 0.897 g/mol
The given sample of gas if found to have a molar mass of 89.686g/mol.
For bulk quantities, the molar mass makes it possible to convert between a substance's mass and its quantity. It is determined as the total of all of the substance's atoms' standard atomic weights.
PV = nRT, where P is pressure (in atm), V is volume (in L), n is the No. of moles of gas, universal gas constant is denoted by R (0.082 Latm/molK), and T is temperature (in K), is the formula used to calculate the molar mass of a gas.
Given:
Mass of gas = 1g
P = 1atm
V = 250mL
T = 273K
To find:
Molar mass of Gas = ?
Formula:
PV = nRT
Calculations:
n = 1 x 0.25 / 0.082 x 273
n = 0.01115 mol
Mass of gas = No. of moles x molar mass
Molar mass = 1 / 0.01115
Molar mass = 89.686g/mol
Result:
The gas is found to have 89.686g/mol molar mass.
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3. If an acid has a pH of 2, what is its [H*]?
If an acid has a pH of 2, then [H⁺] of the given acid is 100.
What is an acid?
An acid is a molecule or ion that may either donate a proton (i.e. hydrogen ion, H+) as a Brnsted-Lowry acid or establish a covalent bond with an electron pair as a Lewis acid. The proton donors, also known as Brnsted-Lowry acids, are the first type of acid. Proton donors in aqueous solutions generate the hydronium ion H3O+ and are known as Arrhenius acids. The Arrhenius hypothesis was expanded by Brnsted and Lowry to include non-aqueous solvents. A Brnsted or Arrhenius acid is often composed of a hydrogen atom coupled to a chemical structure that remains energetically advantageous following the loss of H+.
pH = log[H⁺]
[H⁺] = antilog(pH)
= 10² = 100
Hence, [H⁺] of the given acid is 100.
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HCl has a molarity of 0.010 M and is a 0.010 M solution. Since [H+] = 1 x 10-2 M, this is true. This H+ ion solution is aqueous, and its pH value is 2.
Describe an acid ?A Lewis acid is a molecule or ion that can either contribute a proton (such as the hydrogen ion, H+) or form a covalent bond with an electron pair. The first kind of acid is the proton donor, also Brnsted-Lowry acid. Arrhenius acids are proton donors in aqueous solutions that produce the hydronium ion H3O+. Brnsted and Lowry expanded the Arrhenius hypothesis to incorporate non-aqueous solvents. A Brnsted or Arrhenius acid is frequently made up of a hydrogen atom attached to a chemical structure that continues to be energetically beneficial even after H+ is lost.
pH = log[H⁺]
[H⁺] = antilog(pH)
= 10² = 100
Hence, [H⁺] of the given acid is 100.
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What is the name of the product when you reduced 1-
hydroxy-2-hexanone
with sodium borohydride
(NaBH)?
Answer:
The name of the product on reducing 1-
hydroxy-2-hexanone with sodium borohydride is 1,2 - Dihydroxyhexane
Reduction of carbonyl compounds:
Carbonyl compounds undergo reduction using suitable reducing agent forming alcohols. A number of reducing agents serve this purpose. Some common reducing agents used are:
Sodium borohydrideLithium aluminium hydrideHydrogen in the presence of a catalyst like Platinum or PalladiumWhat is Sodium borohydride?
Sodium borohydride (NaBH4) is a reducing reagent that transforms aldehydes and ketones to their corresponding alcohol.It converts aldehydes to primary alcohol and ketones to secondary alcoholsWe can see that, since the second Carbon on product side has only one hydrogen along with OH group, thus it is a secondary alcohol.
Primary alcohols have 2 hydrogen with the carbon along with hydroxyl group, while tertiary alcohols have no hydrogen on the carbon with hydroxyl group.
Thus we can conclude that the name of the product on reducing 1-hydroxy-2-hexanone with sodium borohydride is 1,2 - Dihydroxyhexane
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Determine the number of bonding electrons and the number of nonbonding electrons in the structure of.
A full valence shell's number of electrons less the amount of electrons involved in bonding equals the number of non-bonding electrons (which is 2 x the typical number of bonds). The amount of electrons not in bonds is equal to the number of lone pairs divided by two.
How can you tell how many electrons are involved in bonds and how many are not?A full valence shell's number of electrons less the amount of electrons involved in bonding equals the number of non-bonding electrons (which is 2 x the typical number of bonds). The amount of electrons not in bonds is equal to the number of lone pairs divided by two.Method 1 for Calculating Bond Order (immediately determine bond order, half bond order) Antibonding Electrons.According to the molecular orbital theory, the difference between bonding and anti-bonding electrons is accounted for by the bond order. Additionally, the molecule will grow more stable the higher the bond order.To learn more about Bonding electrons refer to:
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find moles of fe from 392.2 g of fe(nh4)2(so4)2
Answer:
1.381 moles Fe
Explanation:
To find moles of Fe, you need to (1) convert grams Fe(NH₄)₂(SO₄)₂ to moles (using the molar mass) and then (2) convert moles Fe(NH₄)₂(SO₄)₂ to moles Fe (using the mole-to-mole ratio within the molecule). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 4 sig figs like the given value (392.2 = 4 sig figs).
Atomic Mass (Fe): 55.845 g/mol
Atomic Mass (N): 14.007 g/mol
Atomic Mass (H): 1.008 g/mol
Atomic Mass (S): 32.065 g/mol
Atomic Mass (O): 15.999 g/mol
Molar Mass (Fe(NH₄)₂(SO₄)₂):
55.845 g/mol + 2(14.007 g/mol) + 8(1.008 g/mol) + 2(32.065 g/mol) + 8(15.999 g/mol) = 284.045 g/mol
1 mole Fe(NH₄)₂(SO₄)₂ = 1 mole Fe, 2 moles N, 8 moles H, 2 moles S, 8 moles O
392.2 g Fe(NH₄)₂(SO₄)₂ 1 mole 1 mole Fe
----------------------------------- x ------------------- x ---------------------------------- =
284.045 g 1 mole Fe(NH₄)₂(SO₄)₂
= 1.381 moles Fe
3. Write a hypothesis based on observations and scientific principles.
Answer:
An example of a hypothesis based on observation and scientific principles is:
Deaf children whose parents are deaf will acquire language faster than deaf children whose parents are not deaf.
A hypothesis is an informed prediction or a tentative statement about what you think that would occur in a scientific experiment as a result of experience from observations accepted by scientific rules and law.
A hypothesis is a testable statement obtained from the research question but questions cannot be tested directly, it is the proposed relationship between the variables that are tested.
An example of a hypothesis is:
Deaf children whose parents are deaf will acquire language faster than deaf children whose parents are not deaf.
This specifies the direction of the hypothesis because one group is faster than the other.
write molecular equation (m.e.), ionic equation (i.e.), and net ionic equation (n.i.e.) for each of the following reactions. 1) potassium phosphate with copper (ii) acetate
The molecular, ionic, and net ionic equations of the reaction between potassium phosphate and copper (II) acetate are given below.
The physical states of the substances are depicted in the balanced chemical equation known as a molecular equation, which we may determine using the solubility principles.
When formulae for compounds are expressed as though they were all molecules, the equation is referred to as a molecular equation.
When dissolved ionic chemicals are represented as free ions, the equation is said to be an ionic equation.
A chemical equation known as an ionic equation expresses the electrolytes in aqueous solution as dissociated ions.
A chemical equation known as the net ionic equation shows how ions or molecules change throughout a process.
Net ionic equations lack the common ions that exist on both sides of the ionic equation and are known as spectator ions. In a reaction, ions that do not change at all are known as spectator ions.
Molecular equation:
[tex]2K_3PO_4 (aq) + 3Cu(CH_3COO)_2 (aq) \rightarrow 6K(CH_3COO) (aq) + Cu_3(PO_4)_2 (s)[/tex]
Ionic equation:
[tex]6K^+ (aq) + 2PO_4^{3-} (aq) + 3Cu^{2+} (aq) + 6CH_3COO^- (aq) \rightarrow 6K^+ (aq) + 6CH_3COO^- (aq) + Cu_3(PO_4)_2 (s)[/tex]
Net Ionic equation:
[tex]3Cu^{2+} (aq) + 2PO_4^{3-} (aq) \rightarrow Cu_3(PO_4)_2 (s)[/tex]
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Help please I been stuck on this
what might an engineer need to consider when designing a heating/cooling system for a home in a cooler climate?
How might the design differ for a house found in a warmer climate?
An engineer might need to consider this when designing a heating/cooling system for a home in a cooler climate are Operating Environment, Size Matters, Available Power, and Filtration.
The design might differ for a house found in a warmer climate as the inside environment of buildings will be impacted by a warmer climate, which will also impair the longevity of building materials. A larger requirement for cooling will result from hotter summers. The word "HVAC" refers to the many systems that are employed in both residential and commercial structures for the purpose of heating, cooling, and transferring air between indoor and outdoor areas.
These are the systems that keep you cozy and toasty during the winter and cool and energized during the summer. The three essential elements of heating and cooling systems are a source of hot or cold air, a device for transferring the heated or cooled air into your living space, and a way to control the temperature in your home.
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Mrs. Roberts' class won a day at the bowling alley for their good behavior all year. When they
arrived, jason picked the green ball that weighed 6 lbs, and amanda picked the yellow ball that
weighed 12 lbs. Amanda was having a hard time getting her ball to roll down the lane. Jason was
doing great! he was pushing his ball hard, and it was going straight down the center. He even got
a strike twicel
Amanda’s ball is heavier so it’s harder throw. This was illustrated in the bowling.
How to illustrate the information?Amanda was having such a difficult time because she chose a heavier ball.
Evidence: Jason had no trouble with his 6lb ball, while Amanda struggled with double the weight of Jason's ball, which was 12lb and had more mass.
Reasoning: Jason chose a ball with less mass weighting at 6 pounds, but his ball was more simpler to roll as a result. This was owing to Newton's second law, as having a lighter ball made it easier for him to pass through. Amanda, on the other hand, had a ball that was so heavy that it was difficult to throw.
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a lewis structure will usually require one or more multiple bonds if there is an atom present that does not have a full after all available electrons have already been placed. the multiple bond is formed by exchanging one electron pair for each new bond.
A lewis structure will usually require one or more multiple bonds if there is an atom present that Octet does not have a full after all available electrons have already been placed. the multiple bonds are formed by exchanging one lone electron pair for each new bond.
The entire number of valence electrons should be known. Step 2: Outline the molecule's skeletal structure. Step 3: Form each bond in the skeletal structure using two valence electrons. Step 4: Attempt to fill the remaining valence electrons' nonbonding positions to fulfill the atoms' octets.
The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. When two atoms are bonded together, electrons are depicted as "dots" or as a line.
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a modified ringer’s irrigation has the following formula: sodium chloride 4.6 g potassium chloride 0.2 g calcium chloride 0.43 g peg 3350 25 g water for injection ad 500 ml assuming that 470 ml of water is used in preparing the irrigation, calculate its specific gravity.
The specific gravity of a modified ringer's irrigation is 1.06g/ml
We start by calculating total mass of ingredients:
Total mass of ingredients=4.6+0.2+0.43+25+500
=530.23g
Volume of water=500ml
We now get the density of the solution:
Density=Mass of ingredients/volume of water
=530.23/500
=1.06g/ml
Calculate the specific gravity:
Specific gravity=Density of substance/Density of water
( Density of water=1g/ml)
Specific gravity=1.06/1
=1.06g/ml
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The question is in the photo.Which of the following atoms will bond with O in a 1:1 ratio of O and that element:a) Lithiumb) Boronc) Berylliumd) Nitrogen
Which of the following atoms will bond with O in a 1:1 ratio of O and that element:
a) Lithium
b) Boron
c) Beryllium
d) Nitrogen
To solve the problem we have to look for the oxidation states of these elements.
Li: +1 B: +3 Be: +2 N: +5
These compounds will form an oxide with oxygen. The usual oxidation state of oxygen is -2. To form an oxide, we have to combine our element with oxygen and produce a compound with neutral charge.
For example, Li is +1, O is -2, so we have to combine 2 atoms of Li with one atom of O. The formula for the lithium oxide is Li₂O. Similarly we can form the other oxides. We will obtain:
Li₂O B₂O₃ BeO N₂O₅
If we look at the formulas of these oxides, the only one that will bond with O in a 1:1 ratio is Beryllium since its formula is BeO (it has one atom of O and one atom of Be).
Answer: c) Beryllium.
Consider the balanced reaction below:
Hint: Tetrafluoromethane, otherwise called carbon tetrafluoride or R−14
, is the most straightforward perfluorocarbon (CF4
). As its IUPAC name shows, tetrafluoromethane is the per fluorinated partner to the hydrocarbon methane. It can likewise be named a haloalkane or halomethane.
Complete step by step answer:
On the off chance that you take a gander at the condition, you will see that for each one mole of C
that is responded, one mole of CF4
is delivered. Thus, 1.46
moles of CF4
are created (expecting that there is sufficient F2
). A mole of CF4
has a mass of around 88
grams, so 1.46
moles is equivalent to 128.48
grams. Adjusted to critical figures, your answer will be 128
grams.
Let’s do it bit by bit:
First Change moles of carbon to moles of CF4
n(CF4)=1.46 mol C × (1 mol CF41 mol C) = 1.46 mol CF4
At that point convert moles of CF4
to grams of CF4
utilizing the molar mass
M(CF4)=(1×12+4×19)gmol−1=88gmol−1
m(CF4)=nM=1.46mol×88gmol−1=128g
So, the required answer is [128g]
Given this equation: N2 + 3 H2 → 2 NH3, how many moles of NH3 can be produced from 3.1 moles of H2?
First, we write down our reaction:
N2 + 3H2 → 2NH3
Don't forget to balance it.
We only use moles as units.
Procedure:
3 x 1 mole H2 ------------ 2 x 1 mole NH3
3.1 moles H2 ------------- x
x = 2.1 moles NH3 are produced
Answer: 2.1 moles NH3
Explain why the following statement is trueThe initial number of moles of the unknown acid (HA) is equal to the final amount of the number of moles of the known base (NaOH),
Due to their complete oxidation of one another, the beginning moles of the unknown acid (HA) and the final moles of the known base (NaOH) are equal.
What is oxidation, and give a case?
Summary. An element combining with oxygen is referred to as an oxidation in scientific terminology. For instance, the chemical reaction between oxygen and magnesium metal produces magnesium oxide during the oxidation of magnesium.
What does "oxidation" mean exactly?In order to describe a substance's reaction with oxygen, Antoine Lavoisier coined the term "oxidation." Later, when it was understood that the substance loses electrons when it is oxidized, the definition was expanded to encompass all processes in which electrons are destroyed, regardless of whether oxygen is present.
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What is the density?
Answer:
Density = mass/volume (g/cm³)
First find the volume of the stone by subtracting the readings of the measuring cylinder.
Each unit is 4 ml. Take the reading where the lowest point of the curve of the liquid sits.
The first measuring cylinder reading is 24 ml.
The second measuring cylinder reading is 60 ml.
Volume of stone = 60 - 24 = 36 ml
Make sure the units are appropriate. Convert when necessary. ml and cm³ are the same so there is no need to convert. (36 ml = 36 cm³)
Density = 40/36 = 1.11 g/cm³
Mary thought that the number of frogs in the neighborhood pond had decreased over the last few years. So, she decided to count the number of frogs she saw around the pond twice each day for ten days. Mary's data is displayed in the table below. Day 1 2 3 4 5 6 7 8 9 10 # Frogs at 12 PM 3 2 1 0 1 0 3 2 0 2 # Frogs at 7 PM 15 21 22 13 19 15 20 17 23 18 Based on her observations, which of the following can Mary infer? A. The number of frogs at the pond has steadily increased over the last 2 years. B. Frogs are consumed by predators in the morning and are reborn in the evening. C. The number of frogs at the pond has steadily declined over the last 2 years. D. Frogs rest during the afternoon and become more active in the evening.
Based on her observations, marry infer that Frogs rest during the afternoon and become more active in the evening. option D.
Observations can occur in a lab placing or the herbal world. for example, watching an apple fall from a tree can be a commentary. Noticing that fish only come to a particular part of the river in the early morning is likewise a remark. Smelling garbage decomposing is some other instance of a remark.
The remark is the movement or technique of cautiously looking at a person or something. Careful statement of the motion of the planets. Synonyms looking, have a look at, survey, evaluation more Synonyms of statement.
Observations of a particular setting or state of affairs--this is, take field notes. next, you interpret the notes consistent with the applicable criteria. in the end, you write a nicely prepared paper that presents your observations and interpretations, typically with the goal of answering a research question.
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Most elements' names end in the suffix -ium. This practice started around the year 1800, with many elements discovered before that having a more common name. However, some elements are more recently discovered and don't end in -ium. Do you notice any patterns for these elements?
Most elements' names end in the suffix -ium this practice started around the year 1800, with many elements discovered before that having a more common name however, some elements are more recently discovered and don't end in -ium because element name start with the latin name and then it give suffix to the element
The ium in helium can be thought of carrying the meaning 'derived from' with the hel part representing greek helios means sun it having being inferred that helium was present in sun atmosphere and the ium suffix is a latin suffix which forms abstract nouns, thus it is used to form chemical elements name from its naming origin
There are 81 elements that end in the suffix ium or um which is derived from the latin and it is denoted a metallic substances
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HELP MEEEEE IMA FAIL
Calcium has a 2+ charge, and
oxygen has a 2- charge. A
Lewis dot diagram should
contain one calcium atom and
one oxygen atom to show how
these atoms form an ionic
bond.
O True
O False
The statement ,Lewis dot diagram having 1 calcium atom and 1 oxygen atom to form an ionic bond is true.
What is an ionic bond?Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.
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Answer:
A true
Explanation:
the vibrational frequency of the cl2 molecule in the gas phase is 559.7 cm−1 . calculate the ratio of the number of cl2 molecules in the first excited vibrational state to the number of molecules in the ground state at 298k
The ratio of the number of chlorine gas molecules in the first excited vibrational state to the number of molecules in the ground state at 298k is calculated to be 0.067.
The formula to calculate this ratio can be given as;
[tex]N_{1} / N_{0}[/tex] = [tex]exp (-\frac{hvc}{k_{B}T } )[/tex]
In this equation;
h represents the Planck's constant whose value equals 6.626 × 10^-34 Js
v represents the vibrational frequency
c represents the speed of light which is equal to 2.998 × 10^10 cm s^-1
[tex]k_{B}[/tex] means the Boltzmann constant which is equal to 1.381 × 10^-23 JK^-1
T is equal to 298 K
substituting these values in the above equations;
[tex]N_{1} / N_{0}[/tex] = exp {- (6.626 × 10^-34) (559.7) (2.998 × 10^10) ÷ (1.381 × 10^-23) (298K)}
[tex]N_{1} / N_{0}[/tex] = 0.067
Therefore, the ratio of the number of chlorine gas molecules in the first excited vibrational state to the number of molecules in the ground state at 298k is equal to 0.067.
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at what times should a ph electrode be submerged in a solution? select one or more: when being transferred from storage to a flask when monitoring a reaction in a beaker when being stored in a storage cabinet when not being used between measurements
If we are not using the pH electrode for measurement then it should be submerged in a solution.
What is a pH electrode?
Firstly, we know that the pH of a solution is the negative logarithm of the hydrogen ion concentration of the solution. We know that the more the hydrogen ion concentration of the solution, the owner the pH of the solution.
Having said this, It should be recalled that the measurement of the pH is carried out by the use of the pH electrode. When not being used between measurements, the ph electrode be submerged in a solution.
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A sample of 11.7 moles of silver bromide is reacted
with 8.6 moles of sodium thiosulfate to produce
sodium silver thiosulfate and sodium bromide. Using
the balanced equation below, predict which is the
limiting reactant and the maximum amount in moles
of sodium bromide that can be produced.
AgBr + 2Na2S2O3 → Na3Ag (S₂03)2 + NaBr
A. sodium thiosulfate, 4.30 moles
B. sodium thiosulfate, 8.60 moles
C. sodium bromide, 5.85 moles
D. sodium bromide, 11.7 moles
Answer:
0.30 moles of sodium thiosulfate formula units are needed to make 0.10 moles of AgBr soluble.
Explanation:
3Na2S2O3 + Ag Br→ NaBr + Nas [Ag(S2O3)3 According to reaction, 1 mole of silver bromide dissolves in 3 moles of Sodium thiosulfate. Then 0.10 moles of AgBr will dissolve with:3/1 x 0.10mol = 0.30mol - 0.30 moles of sodium thiosulfate formula units are needed to make 0.10 moles of AgBr soluble. Hope it will be