Answer: atom
Explanation: molecule is a group or two or more atoms
protons and electron are subatomic particles
atom is the smallest unit of matter
A fish has armored plates that enable it to handle the extreme pressure in the deepest, darkest aquatic ecosystem. Where is this fish adapted to live? a pond the open ocean the neritic zone an estuary.
How would you write 16,340 in scientific notation with 2 significant figures?
Answer:
1.6 x 10^4
Explanation:
16,340
with 2 significant figures is
16000
in scientific notation
is 1.6 × 10^4
because 10^4 means
if you move the decimal point 4 spaces then
1.6 becomes 16000
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Scientists hypothesize that Earth's first oceans were made of fresh water. How did oceans obtain fresh water?
Answer:
The oceans obtained freshwater from glaciers melting. The freshwater was then trapped into small places below waves, which could be a reason why there is not much freshwater in the world.
When would a transformation of chemical energy to electrical energy occur?
A. when the current becomes zero
B. when a reaction produces the same products
C. when electrons stop moving between atoms
D. when there is chemical reaction between metals and nonmetals
I think that the answer MAY be D..............but I don't know.
Answer:
it would occur when there are two different metals involved.
Why are fat layers and thick white fur advantageous for polar bears?
Group of answer choices
A. They insulate the bears and allow them to blend in with their environment.
B. They help the bears get rid of excess body heat more readily.
C. They help bears hibernate longer.
D. They allow the bears to run and swim faster to escape predators.
Answer:
A. They insulate the bears and allow them to blend in with their environment
Define pressure and temperature.
Answer:
The pressure of a given amount of gas is directly proportional to the temperature at a given volume. When the temperature of a system goes up, the pressure also goes up, and vice versa. The relationship between pressure and temperature of a gas is stated by the Gay-Lussac's law.
lead ions and magnesium ions both have a charge of 2+. predict the ionic equation for this reaction.
As both the ions have charge of +2 the compound formed is PbMg as the like charges will cancel out each other.
What are ions?An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.Ions of opposite charges combine in ionic compounds.
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. Given the balanced equation representing a reaction:
Fe(s) + 2HCl(aq) → FeCl₂ (aq) + H₂(g)
This reaction occurs more quickly when powdered
iron is used instead of a single piece of iron of the
same mass because the powdered iron
A) acts as a better catalyst than the single piece of
iron
B) absorbs less energy than the single piece of iron
C) has a greater surface area than the single piece of
iron
D) is more metallic than the single piece of iron
Answer:
C
Explanation:
The powdered iron has a greater surface area than the single piece of metal, allowing reactions to be done faster.
It's NOT A because in the reaction Iron is a reactant NOT a catalyst
It's NOT B because it's completely irrelevant to the question
It's NOT D because it's also not relevant to the question at hand
what is 1+1? answer in full sentences.
Do you like the eye color black or blue better?
Answer:
black.
Explanation:
I like seeing myslef, so therefore with black eyes I would be seeing my reflection
How many grams of CO₂ gas would occupy 33.7 L of volume at a temperature of
-22.2°C and a pressure of 990 mm Hg?
1.3atm
Let's see
moles of CO_2
PV=nRTn=PV/RTn=990(33.7)/(251.8)(8.314)n=15.9molMass of CO_2
Molar mass×n15.9(44)699.6gDistinguish between boiling, melting, and sublimation
Answer:
Boiling: The process of conversion from liquid to gas on heating is called boiling.
Example: Water on heating turns into water vapour.
Melting: The process of conversion from solid to liquid at room temperature is called melting.
Example: Ice cream melting at room temperature.
Sublimation: The Conversion of solid to gas directly is called sublimation.
Example: Camphor, Dry ice
Explanation:
Hope it helps you:))))
what information we get Chemical equation ?
Answer:
We get the following information from a chemical equation :--1. We get the symbol and formulas of the reactants and products.
2. The physical state of the reactants and products.
3. From this reaction, we can know the molecular formula of ammonia, water and nitrogen.
4. Here all the species are in a gaseous state.
5. The reaction takes place at a high temperature and pressure.
6. Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as:
Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as: Zn+H2SO 4→ZnSO 4 +H2.
The pressure for 1.0 mol of a gas at 0oC in 3.0 L container is calculated to be 7.5 atm using the ideal gas equation (PV = nRT). The pressure of the gas is measured and found to be 7.1 atm. Which of the following best explains the reason for the discrepancies in the two values?
The best explanation would be that the temperature of the gas has dropped before measuring the pressure.
Relationship between temperature and pressure of gasesAccording to pressure law, the pressure of a gas is directly proportional to its temperature, provided the volume of the gas remains constant.
Thus, since the initial pressure of the gas was calculated to be 7.5 atm, the temperature of the gas must have dropped in order for the measured pressure to be 7.1 atm.
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when 949 J of heat is added to 9 grams of oil at 37˚C , the temperature increases to 62˚C. What is the specific heat of the oil?
Answer:
4.21778 J/(g*C)
Explanation:
specific heat = joules / (mass times temperature change)
949 / (9 times 25)
949 / 225 =
4.21778
What isotope has 45 protons and 57 neutrons
…Answer:
Explanation:
What is the largest possible electronegativity difference for a bond to be covalent?
A.
0.5
B.
1.7
C.
0.0
D.
1.0
Covalent bonding is the sharing of electrons between atoms. The electronegativity difference of 1.7 is the largest for a bond to be covalent. Thus, option B is accurate.
What is the electronegativity difference?The electronegativity difference is the parameter used to determine the polarity and the type of the bond formed by the atom of the species. it gives the measure of the atom to attract the shared electrons.
For a covalent bond to form the electronegativity difference between the two atoms of the molecules must be less than 2. A difference of more than 2 results in ionic bond formation.
Therefore, option B. 1.7 is the highest electronegativity difference for a covalent bond formation.
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Treatment of Poison oak
Answer:
Apply cool compresses to the skin. Use topical treatments to relieve itching, including calamine lotion, oatmeal baths, Tecnu, Zanfel, or aluminum acetate (Domeboro solution). Oral antihistamines, such as diphenhydramine (Benadryl), can also help relieve itching.
Pure N2 in a flask has a pressure of 1.0 atm. If O2 gas is added until the number of molecules of O2 is twice as that of N2. What is the total pressure of the flask
The total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.
Balanced chemical equation of N2 and O2
The balanced chemical equation of nitrogen gas and oxygen gas is determined as follows;
N₂ + 2O₂ → 2NO₂
PV = nRT
Pressure is directly proportional to number of molesP(total) = P(N₂) + PO₂
P(total) = 1 atm + 2(1 atm)
P(total) = 3 atm
Thus, the total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.
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What do makeup experts use in order to create different skin effects?
Answer:
on-skin silicone, liquid latex, and gelatine
Explanation:
hope this helps:)
2. Observe Examine the flame closely. Is it the wax or the wick that burns?
Answer:
Wax
Explanation:
The combustible material in a candle or its fuel is wax. Before the wax can become fuel, it first needs to get hot enough. To start that heating process, you first need to light the wick with another source of fire, such as a match. As the wick burns down the heat of the flame melts the wax around the wick.
PLEASE HELP!!! HOW DO I DO THIS??
What is the Ka of a weak acid with a molarity of 0.333 and a pH of 4.6?
Soil is conserved from erosion to
Answer:
keep it from being washed away by water
Lewis dot structure for H2CCCl2?
Answer:
Explanation:
lewis dot structure:
Carbon has 4 valence electrons and hydrogen has 1 electron. Therefore, in below given way, the lewis dot structure for H[tex]_2[/tex]CCCl[tex]_2[/tex] can be drawn.
What is Lewis dot structure?These illustrations, commonly referred to as lewis structures and electron dot structures, show how electrons are distributed and grouped around atoms.
You must be aware of the total amount of valence electron cloud in order to create the Lewis structure. Based on the atom's group number inside the periodic table, it is possible to determine how many valence electrons are present in a certain atom. Carbon has 4 valence electrons and hydrogen has 1 electron. The lewis dot structure for H[tex]_2[/tex]CCCl[tex]_2[/tex] is given below.
Therefore, in above given way, the lewis dot structure for H[tex]_2[/tex]CCCl[tex]_2[/tex] can be drawn.
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A sample of lead released 2,744 J when it cooled from 90 to 19 °C. What was the
mass of the sample of lead? (The specific heat of lead is 0.129 J/g x °C)
Answer:
299.60 g
Explanation:
Use the formula q = mCΔT (q= heat, m= mass, c = specific heat for that specific substance, ΔT is change in temperature Final Temp - Initial Temp)
Released heat means it has negative sign.
q = mCΔT
-2744 = (mass) (0.129) (19-90)
mass= 299.60 g
How is Hess's law used to calculate the enthalpy of a reaction?
A. The enthalpy is obtained from the difference in final and initial reactions in a path.
B. Enthalpies from similar equations are substituted for unknown reaction enthalpies. C. The final equation in a reaction path provides the enthalpy for the desired reaction.
D. The desired enthalpy is obtained through adding intermediate reactions together.
Considering the Hess's Law, the desired enthalpy is obtained through adding intermediate reactions together. (option D)
Hess's LawHess's law, also called Law can also be called Law of additivity of the enthalpies of reaction, it is a useful method when it is not possible to calculate the enthalpies of reaction from the enthalpies of formation, or in reactions in which the reaction enthalpy cannot be determined experimentally because it is very slow or very explosive.
Hess's law states that when reactants are converted to products, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps.
In this way, Hess's Law determines that when a chemical reaction can be expressed as an algebraic sum of other reactions, its reaction enthalpy is equal to the sum of the enthalpies of the partial reactions. In this way, it allows thermochemical equations to be treated as algebraic equations, and can be added, subtracted, or multiplied by a number to find the desired thermochemical equation.
SummaryHess's Law states that the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.
That is, the desired enthalpy is obtained through adding intermediate reactions together. (option D)
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Kiera and Grace are sisters. They both have blue eyes. Kiera is extremely short for her age and Grace is exceptionally tall for her age. Develop a hypothesis as to why the sisters have different statures. Justify your hypothesis in two or more complete sentences.
The hypothesis as to why the sisters have different statures occurs because from genetics we know that it is linked to the alleles so one sister is shorter than the other one was they had different alleles.
What is the genetic similarity between siblings?On average, siblings share about 50% of their DNA with each other, but some siblings share even more and some less. So while we all have approximately 50% DNA from each parent, the segments we end up getting are completely random.
Hereditary character or gene that is manifested by the absence of the opposite gene, called dominant, in this case, Kiera is extremely short for her age.
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What volume (in mL) of 0.750 M sodium hydroxide is needed to neutralize (react with) 275 ml of 0.500 M sulfuric acid (H2SO4)?
NaOH + H2SO4 -> H2O + Na2SO4
I NEED WORK
We know the formula
C1V1=C2V2C is concentration and V is volume
0.750V1=275(0.5)0.75V1=137.5V1=183.34mLThe new volume will be by using the relation between molarity and volume formula.
What is molarity?Molarity, also termed as molar concentration in a solution, is a method of determining how much material is present in a chemical solution.
Calculation of volume with the aid of molarity formula is shown below:
Volume is calculated by using the molarity formula.
[tex]M_{1} V_{1} = M_{2} V_{2}[/tex]
Where, M is molarity and V is volume.
It is given that, [tex]M_{1}[/tex] = 0.750 M , [tex]M_{2}[/tex] = 0.500 M, [tex]V_{1}[/tex] = 275 ml .
Now, put the value of given data in molarity formula.
[tex]M_{1} V_{1} = M_{2} V_{2}\\V_{2} = M_{1} V_{1} / M_{2}\\V_{2} = (0.750 M) (275 ml) / 0.500 M\\V_{2} = 183.34 ml[/tex]
Therefore, the volume will be 183.34 ml.
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in need of some help with this question please~
when 4g of oxygen gas reacts with excess of hydrogen gas, the volume of water vapour produced at (STP) is ....... L ( H = 1 , O = 16).
a) 22.4
b) 44.8
c) 11.2
d) 5.6
an explanation would be great for future reference <3 thank you in advance!
Answer:
5.60 Liters at STP
Explanation:
First you need the balanced reaction equation
2 H2 + O2 ====> 2 H2O
4 g of oxygen ( O2 ) is 4/(15.999*2) moles of O2 (using periodic table)
Twice the number of moles of H2O re produced (from equation)
at STP the volume of a mole of gas is 22.4 liter/ mole
put all of this together
2 * 4 / (15.999*2) moles * 22.4 L/mole = 5.60 L
What is the phase of water at 0.5 atm and 100°C?
Water
(liquid)
Water vapor
(gas)
Temperature (°C)
Pressure (atm)
1-
0.5-
0.25-
0
OA. Gas
OB. Liquid
O C. Solid
OD. Gas and liquid
10
Ice
(solid)
0.01
100
The phase of water at 0.5 atm and 100°C is gaseous phase.
What is water phase?
Water exists in three different phases such as liquid, gas, and solid.
The phase of the given water can be determined using phase diagram at standard temperature and pressure as shown in the image uploaded.
At 0.5 atm and 100 °C, the water is still in vapour or gaseous phase.
Thus, the phase of water at 0.5 atm and 100°C is gaseous phase.
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