Chemical Reaction Pre

What is a chemical reaction?

• A process in which new substances are formed

• A process in which no new substances are formed

• A process in which atoms disappear

• A process in which atoms change shape

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What is the Law of Conservation of Matter?

• Matter can be created or destroyed

• The number of atoms before and after a chemical reaction changes

• Atoms can only rearrange themselves in a chemical reaction

• Matter can change its properties in a chemical reaction

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What is a physical change?

• A change in the properties of matter with a chemical change

• A change in the properties of matter without any physical change

• A change in state of matter where new substances are formed

• A change in state of matter where no new substance is formed

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What do chemical engineers and material scientists study chemical reactions for?

• To create new elements

• To advance space exploration, make medicines, and form new products

• To study the properties of matter

• To understand the behavior of atoms

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How is a physical change different from a chemical change?

• In a physical change, new substances are formed. In a chemical change, new substances are formed

• In a physical change, no new substances are formed. In a chemical change, new substances are formed

• In a physical change, new substances are formed. In a chemical change, no new substances are formed

• In a physical change, no change occurs. In a chemical change, new substances are formed

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How do you know a chemical reaction has happened?

• If a new substance is not formed, it has different properties

• If a new substance is not formed, it has the same properties

• If a new substance is formed, it has the same properties

• If a new substance is formed, it has different properties

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Give an example of a chemical change.

• Freezing water to form ice

• Boiling water to form steam

• Melting ice to form water

• Steel wool burning, which causes the iron to combine with oxygen and form iron oxide

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What is the purpose of balancing a chemical equation?

• To make the equation look more aesthetically pleasing

• To change the chemical properties of the substances involved

• To make the equation easier to memorize

• To ensure that the law of conservation of mass is obeyed.

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In a combustion reaction, what are the reactants and products?

• The reactants in a combustion reaction are a fuel and a catalyst, while the products are typically nitrogen and oxygen.

• The reactants in a combustion reaction are water and carbon dioxide, while the products are typically a fuel and an oxidant.

• The reactants in a combustion reaction are a fuel and a reducing agent, while the products are typically sulfur dioxide and nitrogen oxide.

• The reactants in a combustion reaction are a fuel and an oxidant, while the products are typically carbon dioxide and water, along with heat and light energy.

What is the general form of a synthesis reaction?

• A + B → AB

• AB → A + B

• A + B → A + B

• A + B → BA