Answers CR Physical Science Sem. 1Atomic Theory

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Enzymes are added to a chemical reaction to lower the activation energy. What is an enzyme classified as?

a catalyst

an inhibitor

an accelerator

a depressant

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The chart shows the path reactants take to become products.

Heat was removed from the activation energy to create the product.

Heat was added to create the product.

The products have less energy than the reactants.

The products have the same energy as the reactants.

Four canisters contain helium gas.

Three students are working with different substances to measure the chemical changes that occur. Chao is working with milk, Mia is working with carbon dioxide gas, and Ezra is working with rock. Which would best describe the way to treat each substance to get a faster reaction?

Chao should change the temperature, Mia should adjust the pressure, and Ezra should increase the surface area.

Chao should change the concentration, Mia should adjust the temperature, and Ezra should increase the surface area.

Chao should change the temperature, Mia should adjust the concentration, and Ezra should decrease the surface area.

Chao should change the concentration, Mia should adjust the pressure, and Ezra should decrease the surface area.

Food can spoil very quickly. Which methods are used to minimize the reactions that allow bacteria and fungi to grow?

preservatives and low temperature

high temperature and preservatives

catalysts and high temperatures

low temperatures and catalysts

There are a few ways to increase the rate of a reaction. What is altered when the amount of a substance in a given volume is increased?

temperature

concentration

surface area

pressure

Which describes a scenario that would most likely use an inhibitor?

During activity, sugar is converted to energy.

When at rest, the body stores sugar.

After a meal, protein digestion occurs in the stomach.

Before a meal, digestive juices are preparing for food.

Why is reaching activation energy necessary?

Reactants require a minimum amount of energy to start to break a chemical bond.

Products require a minimum amount of energy to start to break a chemical bond.

Reactants must have the maximum amount of energy to start to break a chemical bond.

Products must have the maximum amount of energy to start to break a chemical bond.

Two substances did not react with each other as expected. What is the most likely reason?

It was heated.

It was hit with a hammer.

It was placed in a salt solution.

It was frozen.

The pictures represent three different states of matter.

X → Y → Z

Z → Y → X

Y → Z → X

Y → X → Z

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