Answer:
C
Explanation:
ostriches are classified as diurnal
Answer: The answer is diurnal!
Explanation: Nocturnal animals, such as the owl or bat, stay awake during the night and sleep during the day! Which for diurnal animals, they sleep during the night, and roam around during the day! Such as us humans are both because some people may work during the night and sleep during the day! The most common for humans is us sleeping at night though and awake during the day!
Explain covalent bond?
You have 7 moles of H2O. How many particles are present?(Avogadro's Number is 6 x 10^23) a 4.2 x 10^23 b 4.2 x 10^24 c 4.2 d 42
Answer
b. 4.2 x 10²⁴
Explanation
Given:
Moles of H2O = 7 moles
Avogadro's Number is 6 x 10²³
What to find:
The number of articeles of H2O present in 7 moles of H2O.
Solution:
1 mole f any substanc contains 6 x 10²³ partcicles
Therefore 7 moles of H2O will contain
[tex]\frac{7\text{ }moles}{1\text{ }mole}\times6\times10^{23}\text{ }particles=4.2\times10^{24}\text{ }particles[/tex]The correct answer is option:
b. 4.2 x 10²⁴
In an experiment, a solution required 30. 05 g of nacl, 50. 0 g of , and 0. 4006 g of mgso4. Using the correct number of significant figures, what is the resulting mass?.
Using significant figures and rounding up, the resulting mass is 80.5 g.
When using addition or subtraction, the total number of significant figures is relevant. Instead, the last significant figure of every number is considered.
In 30.05, the last significant figure is 5, and it is in the hundredths. In 50.0, the last significant figure is 0, and it is in the tenths. Finally, in 0.4006, the last significant figure is 6, and it is in the ten thousandths. Of the three, the 0 from 50.0 is in the "highest" position, and so the last significant figure of the results should also be in the tenths.
If we add the numbers up, we get:
30.05 g + 50.0 g + 0.4006 = 80.4506 g
Because the last significant figure should be in the tenths, we are going to round up 4 to 5, because trailing numbers are greater than 0, so the final mass will be 80.5 g.
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How many moles of cobalt atoms are in 29.4 grams of cobalt?
0.4988699069454786 Moles of cobalt atoms are in 29.4 grams of cobalt.
How to convert grams of cobalt into moles of cobalt ?In order to convert grams of cobalt into moles of cobalt :
n = m / M,
n - number of moles.
m in grams - specific mass.
M is the molar mass of this material.
n = 29.4 g / 58.933200 g/mol
n = 0.4988699069454786 moles
A mole is defined as 6.0221076 × [tex]10^{23}[/tex] of any chemical unit, be it atoms, molecules, ions or others. A mole is a convenient unit to use because any substance has a large number of atoms, molecules or otherwise.
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A compound contains 19.3% Na, 26.9% S, and 53.8% O. its formula mass is 238g. what
The empirical formula of the compound, given it contains 19.3% Na, 26.9% S, and 53.8% O is NaSO₄
How to determine empirical formulaThe following paameters were obtained from the question:
Sodium (Na) = 19.3%Sulphur (S) = 26.9%Oxygen (O) = 53.8%Empirical formula =?The empirical formula of the compound can be obtained as follow:
Divide by their molar mass
Na = 19.3 / 23 = 0.839
S = 26.9 / 32 = 0.840
O = 53.8 / 16 = 3.3625
Divide by the smallest
Na = 0.839 / 0.839 = 1
S = 0.840 / 0.839 = 1
O = 3.3625 / 0.839 = 4
Thus, the empirical formula of the compound is NaSO₄
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Complete question:
A compound is 19.3% Na, 26.9% S, and 53.8% O. Its formula mass is 238 g/mol. What is the empirical formula? Show your work in a neat and logical manner.
A gas has a volume of 6 L when its temperature is 300 K. What will the gas's new volume be if the temperature is reduced to 200 K?
The volume of fuel is 6 liters and the temperature is about 300 degrees. Gasoline laws relate to volume, strain, temperature, and amount of fuel. New fuel volume when the temperature drops to 200 ok: the old way to fine-tune gasoline. 273 ok (0°C) and pressure 1.00 atm.
Temperature is a measure of hot or cold expressed in many scales, including Fahrenheit and Celsius. Temperature indicates the route wherein heat energy will spontaneously waft—i.e., from a hotter body (one at a better temperature) to a colder frame (one at a decreased temperature). warmness is the overall energy of the motion of the molecules of a substance, while temperature refers back to the measure of the average energy of the motions of the molecules inside the substance.
Temperature is just a size that shows the average kinetic strength of one atom or molecule. hence, whilst we say something is hot or bloodless, we're normally using some other reference factor to outline the hotness and coldness of a frame. A thermometer is a tool that measures temperature. it can measure the temperature of a stable along with food, a liquid inclusive of water, or fuel along with air.
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if you want to use the quick transition dialog box to apply multiple dissolves to a series of cut point, how do you identify the cuts to which the dissolves will be applied?
Around the cuts you want the transition to appear on, add in and out points.
What does "transition dialog box" mean to you?You can build a transition from one state in the lifecycle to another state using the new Transition dialog box. You can additionally specify which roles are permitted to move the object through this transition by using this feature.
What does the scientific term dissolve mean?A solute in a gaseous, liquid, or solid phase can dissolve in a solvent to create a solution through the process of dissolution.
Solubility. The greatest concentration of a solute that may dissolve in a solvent at a specific temperature is known as solubility.
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During the determination of molar mass of co2 experiment, suppose you measure the atmospheric pressure of the lab as 752 torr and the temperature of the lab as 21°c. If the vapor pressure of water is 18. 65 torr at 21°c, what is the pressure, in atm, of the co2 collected?.
The pressure of the CO₂ collected in atm is 0.965 atm.
We need to know about pressure to solve this problem. Pressure is unit that describe how much force applied on a surface area. It can be determined as
P = F / A
where P is pressure, F is force and A is area.
From the question above, we know that
Pvapor = 18.65 torr
P = 752 torr
From partial pressure, we can conclude that
P = Pco₂ + P vapor
752 = Pco₂ + 18.65
Pco₂ = 752 - 18.65
Pco₂ = 733.35 torr
Convert to atm
Pco₂ = 733.35 torr
Pco₂ = 733.35/760 atm
Pco₂ = 0.965 atm
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Answer the following questions using the information from these videos. Be sure to use complete sentences.
1) What are the suspects accused of doing?
2) Describe how the suspects used the zinc metal and the zinc chloride solution to change the copper coins to silver.
(Hint: Additive or Displacement plating?)
3) How did the suspects make the silver coins look gold?
Based on the electroplating process video:
The suspects were accused of producing fake gold coins.The suspects used the zinc metal and the zinc chloride solution to change the copper coins to silver by additive plating.The suspects made the silver coins look gold by holding it over a roaring bunsen flame.What is electroplating?Electroplating is the process by which a metal is used to coat the surface of another substance.
The process of electroplating is done in order to improve the quality of the material being coated as well as to make it more durable.
In the video, the copper coins were plated with zinc by dipping the coins into a solution of sodium zincate.
The sodium zincate is prepared by dissolving powdered zinc in a sodium hydroxide solution.
The undissolved zinc powder in the solution will form a fine film of zinc over the copper making it looks shiny like zinc.
The zinc-coated coin is then held over a bunsen flame until it turns shiny gold.
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Using the fictional periodic tale which of the following is the correct molar mass of H₂SO4
A
B
C
D
45.77 g
82.98 g
115.58 g
180.78 g
The mass of 6.022*10*23 atoms, molecules, or formula units make up one mole of a substance, which is known as the molar mass. This value is given in grams per mole.
The mass of a sample of a chemical compound divided by the quantity, or number of moles in the sample, measured in moles, is known as the molar mass of that compound. A substance's molar mass is a bulk characteristic rather than a molecular one.
Units: g/mol. Determine the atomic masses of each atom.Count the number of those atoms that are in the formula:The sum of all atomic masses. (Note: You must multiply it by the quantity of each atom in the formula if there are multiples of that atom.)Atomic masses:
Hydrogen - 1.01Sulphur - 32.06Oxygen - 16Number of atoms:
S - 1; O - 4; H - 2;
Molar mass = 32.06 + (1.01 * 2) + (16 * 4)
= 98.08 g/mol
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4. List the basic tenants of the Kinetic Molecular Theory.
Answer:
The five main postulates of the KMT are as follows: (1) the particles in a gas are in constant, random motion, (2) the combined volume of the particles is negligible, (3) the particles exert no forces on one another, (4) any collisions between the particles are completely elastic, and (5) the average kinetic energy of ...
Explanation:
HELP WILL GIVE BRAINLIST
A student measures the density of a piece of plastic to be 0.90 g/ml. However, the accepted value for the density of that type of plastic is 1.1 g/ml. What is the percent error in her measurements?
Answer: The density of a substances is generally known as mass per unit volume. And The SI unit is Kg/m3. Mass Versus Weight: Always there is confusion in people between mass and weight. Actually, the mass of an object is referred to its weight. In the scientific concepts mass refers loosely to the amount of matter in an object.
Explanation:
which of the following is a derived unit (a) kg ( b) meter ( c) kelvin ( d ) newton
Among the given options, the derived unit is Newton. Option d is correct.
Derived units are measure units that have been derived from more than one base unit. Also understood as the units derived from the fundamental units. They either lack dimension or are the products of base units, like derived unit of force is Newton. A total of 22 derived units exist. The basic 7 derived units are Length is meter(m), Mass is kg (kilogram) ,Time is s (second), Electric Current is A (Ampere) ,Thermodynamic Temperature is K (degrees Kelvin) ,Amount of Substance is mol (mole) and Luminous Intensity is cd (candela)
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Can someone help me with level 17 of Covalent Bonds o the Collision app? This is the last one and it's urgent.
The covalent compounds formed from the given elements are as follows:
Water; H₂OCarbo (iv) oxide; CO₂, and Nitrogen trifluoride; NF₃What are covalent compounds?Covalent compounds are compounds that are formed as a result of covalent bonds formed between atoms of different elements.
Covalent bonds are formed as a result of sharing of electrons between atoms of different elements usually non-metals.
Due to differences between the electronegativities of atoms of nom-metals, the electrons shared in covalent compounds are not always shared equally. Thus, several other intermolecular forces exist between molecules of covalent compounds.
Some of the intermolecular forces that exist in covalent compounds include:
London Dispersion forcesDipole Dipole forcesHydrogen bondingGiven the following elements: nitrogen, fluorine, oxygen, carbon, and hydrogen.
The covalent compounds that can be formed representing the given intermolecular forces are as follows:
Water; H₂O - hydrogen bonding exists between water moleculesCarbo (iv) oxide; CO₂ - London dispersion forces are the major intermolecular forces present in carbo (iv) oxide given moleculesNitrogen trifluoride; NF₃ - dipole dipole forces predominate in nitrogen trifluoride molecules.
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What rule can you state about the relationship between phase changes and heat energy?
The terms change of phase and change of state are synonymous. A change in phase is always accompanied by a change in heat. However, the temperature remains constant. When we heat a solid, the energy supplied is used to increase the kinetic energy of its molecules, resulting in an increase in temperature.
What happens to energy when the phases change?A system undergoing a phase change absorbs or releases energy. Energy changes are equal in magnitude but opposite in sign for systems undergoing complementary phase changes. The heat energy added during the phase change overcomes some of the forces that hold the molecules together, allowing them to move further apart. The added heat energy is stored as potential energy, or energy of position, during the phase change because the molecules are now further apart. A change in phase is always accompanied by a change in heat. However, the temperature remains constant. When we heat a solid, the energy supplied is used to increase the kinetic energy of its molecules, resulting in an increase in temperature.To learn more about phase changes, refer to:
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A compound containing only c, h, and o, was extracted from the bark of the sassafras tree. the combustion of 72.3 mg produced 196 mg of co2 and 40.2 mg of h2o. the molar mass of the compound was 162 g/mol. determine its empirical and molecular formulas
The Empirical formula of the compound is C₅H₅O.
and molecular formula of the compound is C₁₀H₁₀O₂.
mass of C in the compound = (196g CO2)x (12.0 g C/44.0 g CO2) = 53.45g C
mass of H in compound = (40.2 g H2O) x (2.0 g H /18.0 g H2O) = 4.46 g H
mass of O in compound = 72.3 g total - 53.45 g C - 4.46 g H = 14.39 g O
now convert mass of each element to moles
53.45 g C x (1 mole C/12.0 g C) = 4.45 moles C
4.46 g H x (1 mole H/1.0 g H) = 4.46 moles H
14.39 O x (1 mole O/16.0 g O) = 0.899 moles O
Divide each by 0.899 to get C₅H₅O, which has a mass of 81 g
double that to get C₁₀H₁₀O₂ with mass of 162 g.
This is a "classic" example of a combustion analysis problem.
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Is milk going sour caused by heating
Answer:
Both are chemical changes and both are physical changes.
Explanation:
Milk can go sour in the fridge and I don't really know about the conserve mass one.
Question 19
How many hydrogen ions (protons; H-) would need to bond with the carbonate anion to create carbonic acid?
A. 1
B. 2
C. 3
D. 4
2 hydrogen ions (protons; H-) would need to bond with the carbonate anion to create carbonic acid.
In what bonds does carbonic acid consist?One carbon-oxygen double bond and two carbon-oxygen single bonds make up the structure of carbonic acid, as can be seen from the example given above. One hydrogen atom is joined to each of the oxygen atoms involved in a single bond with the carbon.
Do hydrogen bonds exist in carbonic acid?In the dimers of carbonic acid, bifurcated hydrogen bonds frequently occur, creating a complicated picture with several orbital interactions of different intensities. The lowest energy dimers are made up of two anti-anti monomers interacting through the strongest C=OH-O hydrogen bonds.
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vanadium forms four different oxides in which the percent by mass of vanadium is, respectively, (a) 76%, (b) 68%, (c) 61%, and (d) 56%. determine the formula and the name of each oxide.
A. The formula and the name of the oxide is VO, Vanadium(II) oxide
B. The formula and the name of the oxide is V₂O₃, Vanadium(III) oxide
C The formula and the name of the oxide is VO₂, Vanadium(IV) oxide
D. The formula and the name of the oxide is V₂O₅, Vanadium(V) oxide
How to determine the formula and the nameThe formula and the name of the various oxide can be obtained as follow:
A. Formula and name for oxide with 76% vanadium
V = 76%O = 100 - 76 = 24%Empirical formula =?Divide by their molar mass
V = 76 / 50.9 = 1.49
O = 24 / 16 = 1.5
Divide by the smallest
V = 1.49 / 1.49 = 1
O = 1.5 / 1.49 = 1
Thus, the empirical formula of the compound is VO and the name is Vanadium(II) oxide
B. Formula and name for oxide with 68% vanadium
V = 68%O = 100 - 68 = 32%Empirical formula =?Divide by their molar mass
V = 68 / 50.9 = 1.34
O = 32 / 16 = 2
Divide by the smallest
V = 1.34 / 1.34 = 1
O = 2 / 1.34 = 1.5
Multiply by 2 to express in whole number
V = 1 × 2 = 2
O = 1.5 × 2 = 3
Thus, the empirical formula of the compound is V₂O₃ and the name is Vanadium(III) oxide
C. Formula and name for oxide with 61% vanadium
V = 61%O = 100 - 61 = 39%Empirical formula =?Divide by their molar mass
V = 61 / 50.9 = 1.2
O = 39 / 16 = 2.4375
Divide by the smallest
V = 1.2 / 1.2 = 1
O = 2.4375 / 1.2 = 2
Thus, the empirical formula of the compound is VO₂ and the name is Vanadium(IV) oxide
D. Formula and name for oxide with 56% vanadium
V = 56%O = 100 - 56 = 44%Empirical formula =?Divide by their molar mass
V = 56 / 50.9 = 1.1
O = 44 / 16 = 2.75
Divide by the smallest
V = 1.1 / 1.1 = 1
O = 2.75 / 1.1 = 2.5
Multiply by 2 to express in whole number
V = 1 × 2 = 2
O = 2.5 × 2 = 5
Thus, the empirical formula of the compound is V₂O₅ and the name is Vanadium(V) oxide
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determine the average value of the translational kinetic energy of the molecules of an ideal gas at (a) 0.00 oc and (b) 100 oc. what is the translational kinetic energy per mole of an ideal gas at (c) 0.00 oc and (d) 100 oc?
If the volume of the gas is increased to 9.90 l (at constant temperature), then its pressure will be 373 mmg.
According to Boyle's law, if the temperature of a gas is constant then the volume and pressure of the gas can be in relation to each other at different times.
We are given:
The initial volume of the gas V1 = 4.90 L
The initial pressure P1 = 755 mmg
The final volume of the gas V2 = 9.90 L
The final pressure of the gas P2 = ?
Using Boyle's law equation we can find the final pressure.
The equation is
P1V1 = P2V2
P2 = P1V1/V2
P2 = 755 x 4.90 / 9.90
P2 = 373 mmg
Thus, the final pressure is 373 mmg. Hence we can conclude that as the pressure decreases then volume of gas increases.
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A 1.0 m solution of HC1 in benzene has a freezing point of 0.4 °C. Is HC1 an electrolyte in benzene? Explain.
Based on the freezing point depression value of HCl in benzene, HCl does not act as an electrolyte in benzene.
What is the effect of solute on the freezing point of a solvent?The freezing point of a solvent such as water is lowered by the solute which ionizes in it.
The freezing point of a solution depends on the number of particles in the solution.
The formula for freezing point depression is given below:
ΔTf = i * Kf * m
HCl remains as molecules and does not ionize in a solution of Benzene. This is because benzene is a nonpolar solvent.
Therefore, the equation for the dissolution of HCl in benzene is given below:
HCl (g) → HCl (in benzene solution)
1 mol of HCl gas gives 1 mol of HCl molecules in solution.
Therefore, HCl remains a molecule and does not act as an electrolyte in benzene.
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Marcie fills a graduated cylinder with 15.0 mL of water (Vi). Paul finds the mass of a marble to be 2.21g, then drops the marble into the graduated cylinder. If the meniscus on the graduated cylinder is now at 16.3 mL (Vf), what is the density of the marble?
The density of the marble is 1.7kg/m³
Density is the amount of mass per unit of volume
Marcie fills a graduated cylinder with 15.0 mL of water (Vi) paul finds the mass of a marble to be 2.21g, then drops the marble into the graduated cylinder if the meniscus on the graduated cylinder is now at 16.3 mL (Vf)
We have to find density of the marble = ?
Volume = (Vi) - (Vf) = 15.0 mL - 16.3 mL
Volume = 1.3mL
Mass = 2.21g
Density = mass/volume means ρ = m/V
Density = 2.21g / 1.3mL
Density = 1.7kg/m³
The density of the marble is 1.7kg/m³
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How many mols of sodium are present in 6.7 grams of sodium?
The answer is 22.98977. We assume you are converting between grams Na and mole.
write a balanced chemical equation based on the following description: propanol, c₃h₇oh(l) burns in air to produce gaseous carbon dioxide and water vapor
The balanced chemical equation of combustion of propanol is 2 C₃H₇OH +9 O₂[tex]\rightarrow[/tex] 6 CO₂ +8 H₂O.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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The density of silver is 10.5 g/cm3. What mass of silver would occupy a volume of 56.0 cm3?
Answer:
28 g
Explanation:
d = m/V
m = dV = 10.5 x 56.0 = 28 g
The number of ______________________ can be used to identify an element.
FeSO4(aq) + K3PO4 (aq) —>
K2CO3 (aq) + CdI2 (aq) —>
CaCo3 (aq) + HNO3 (aq) —>
An ionic equation is a chemical equation in which the electrolytes in aqueous solution are described as dissociated ions.
What is the difference between ionic equation and net ionic equation?A complete ionic equation also contains the spectator ions, whereas a net ionic equation just displays the chemical species that are involved in a reaction.A molecular formula has two or more atoms bonded together, whereas a chemical formula can only refer to one atom. They are both elements, and their chemical symbols are unchanged.An ionic equation is a chemical equation in which the electrolytes in aqueous solution are described as dissociated ions. It is similar to a molecular equation in that it expresses compounds as molecules.3FeSO4(aq) + 2K3PO4(aq) = Fe3(PO4)2(s) + 3K2SO4(aq)
ionic equation : 3Fe(2+)(aq) + 3SO4(2-)(aq)+ 6Na(+)(aq) + 2PO4 (3-) (aq) → Fe3(PO4)2(s)+ 6Na(+) + 3SO4(2-)(aq)
net ionic equation: 3Fe(2+)(aq) + 2PO4 (3-)(aq) → Fe3(PO4)2(s)
K2CO3(aq) + CdI2(aq) = 2KI(aq) + CdCO3(s)
net ionic equation for K2CO3(aq) + CdI2(aq) = 2KI(aq) + CdCO3(s).
2HNO3 + CaCO3 = Ca(NO3)2 + H2O + CO2
ionic equation : CaCO3(s) + 2H+(aq) → Ca2+(aq) + CO2(g) + H2O()
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How many moles of nitrate ions are there in 8.92 mol Ba(NO3)2?
Answer:
1 mole of Barium Nitrate has One mole of Barium ions, two moles of Nitrate ions
The mass number of a fluorine atom with 4 neutrons is ________________.
Group of answer choices
5
23
13
9
Answer:
9
Explanation:
The mass will only be 9 if there are 4 neutrons, hope this helps
a chemical ____ is a process in which some substances change chemically into different substances
Answer:
Explanation:
a chemical reaction is a process in which the some substances go into reactant and some into products , the reactant molecule produce the new molecules in the form of product, it's also called the breaking of chemical bonds and forming the new bonds .