What energy conversion occurs when a battery powered car rolls across the floor?Stored chemical energy is converted to mechanical energy.

Stored electrical energy is converted to mechanical energy.

Stored mechanical energy is converted to mechanical energy.

Stored nuclear energy is converted to electrical energy.

Answers

Answer 1

Answer: Stored chemical energy is converted to mechanical energy.

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The atoms of Group 7A elements _____ electrons when they form ions.A. share B. gain C. lose D. cannot be determined

Number of protons in an atom's nucleus?: _________

Answers

Answer:

The number of protons in the nucleus of an atom is its atomic number, which is unique to each element.

Explanation:

Answer:

It's the same as the atomic number e.g. Oxygen has the atomic number 8 so it has 8 protons in the nucleus.

Large cities often have a visible haze hanging in the air high above them. What most likely causes this haze? a. many women's aerosol hairsprays

Answers

Haze is caused by particulate matter from incomplete combustion of car, truck, bus, burning of gasoline and diesel. This could also be caused by the buning of wood, coal, and heating oils from industry, electical generation plants that do not collect some of the pollutants at the smoke stack or exhaust points.

Which of the following is not an example of a polymer?Select one:
a. Polystyrene
b. Nylon
c. Sucrose
d. PVC

Answers

The answer is: sucrose.

Polystyrene, nylon and PVC are examples of a polymer.

Sucrose or table sugar (C₁₂O₂₂O₁₁) composed of two monosaccharides. This monosaccharides glucose and fructose are linked with an ether bond between C1 on the glucosyl subunit and C2 on the fructosyl unit.

Polystyrene is a synthetic aromatic hydrocarbon polymer made from the monomer styrene.

Styrene (ethenylbenzene) is an organic compound with the chemical formula C₆H₅CH=CH₂. It is a colorless oily liquid.

Plastic PVC is organic polymers of high molecular mass derived from petrochemicals.

Final answer:

Among Polystyrene, Nylon, PVC, and Sucrose, the compound that is not a polymer is Sucrose because it is a smaller, simple molecule comprised of two monosaccharides and does not have a long chain of repeating units.

Explanation:

In considering the options provided, Polystyrene, Nylon, and PVC are all polymers. Polymers are made up of many similar units or monomers, and they typically have high molecular weights. Polystyrene, Nylon, and PVC, which stands for Polyvinyl Chloride, are large molecules made up of repeating subunits. The only one which does not fit this particular basis is Sucrose.

Sucrose, commonly known as table sugar, is a small, simple molecule. It is a disaccharide, meaning it is composed of two monosaccharides, glucose and fructose. Therefore, it is not a polymer because it does not contain a long chain of repeating units.

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What size container do you need to hold 0.0459 mol of N2 gas at stp

Answers

The size of the container needed to hold the gas is 1.03 L

Data obtained from the question

Number of mole (n) = 0.0459 mole
Pressure (P) = STP = 1 atm
Temperature (T) = STP = 273 K
Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) =?

How to determine the volume

The volume of the container needed can obtained by using the ideal gas equation as illustrated below:

PV = nRT

Divide both side by P

V = nRT / p

V = (0.0459 × 0.0821 × 273) / 1

V = 1.03 L

Therefore, the size of the container needed is 1.03 L.

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Answer:

The size of the container needed is 1,03 liters

Explanation:

We use the formula PV=nRT. The STP conditions correspond to 1 atm of pressure and 273 K of temperature.

PV=nRT V=(nRT)/P

V= (0,0459 mol x 0,082 l atm/ K mol x 273K)/1 atm= 1,0275174 liters

A 25.5 liter balloon holding 3.5 moles of carbon dioxide leaks. If we are able to determine that 1.9 moles of carbon dioxide escaped before the container could be sealed, what is the new volume of the container?

Answers

Answer: The new volume of the container is 13.8 L

Explanation:

To calculate the new volume of the system, we use the equation given by Avogadro's Law. This law states that volume of the gas is directly proportional to the number of moles of the gas at constant pressure.

Mathematically,

$(V_1)/(n_1)=(V_2)/(n_2)$

where,

$V_1\text{ and }n_1$ are the initial volume and moles of the gas.

$V_2\text{ and }n_2$ are the final volume and moles of the gas.

We are given:

$V_1=25.5L\nn_1=3.5\nV_2=?\nn_2=1.9$

Putting values in above equation, we get:

$(25.5)/(3.5)=(V_2)/(1.9)\n\nV_2=13.8L$

Thus the new volume of the container is 13.8 L

A crucible contains 6.4 g of copper, Cu. How many moles does this amount contain? [Given: Cu=64]

Answers

Use this formula:
Mass = moles x RFM

(RFM = Relative Formula Mass, or the total mass of a substance or element for example Cu=64)

Rearrange the formula to find the number of moles
Moles = mass/RFM
=6.4/64
= 0.1

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