Chemical Reactions

What is the best way to describe what happens after a chemical reaction?

• You get the same substances as before but with different characteristics.

• You get a new substances but has the same properties as before.

• You get the same substance with the same properties as before.

• You get a different substance with different properties than before.

How do you know if a chemical reaction occured?

• Did the amount of the substance change

• Did the shape of the substance change

• Did the properties change

• None of the above

Burning is an example of

• A physical change in which the substance melts or evaporates

• A chemical reaction in which a substance reacts with oxygen

• A physical reaction in which a substance reacts with oxygen

• A chemical change in which the substance melts or evaporates

What best described the term "reactants?"

• A property of a substance

• The starting substance in a reaction

• The substance made by a chemical reaction

• None of the above

What best described the term "products?"

• A property of a substance

• The starting substance in a reaction

• The substance made by a chemical reaction

• None of the above

Which of the following are true regarding chemical reactions?

• substances interact and their atoms combine in new ways

• new atoms are found in the products

• the new substances are made of the same atoms, but those atoms are arranged in different ways.

• The products and reactants have the same properties

• The products and reactants have different properties

The products of a chemical reaction have different properties than the reactants because

• The atoms of the reactants rearrange to form a new substance

• New atoms combine with the reactants to form a new substance

• The reactants lose atoms which forms a new substance

• Both the reactants and products always have the same properties

Which of the following are examples of chemical reactions?

• when a substance burns.

• When a single substance breaks down

• When two or more substances interact and their atoms combine in new ways

• Only occurs when two substances interact and their atoms combine in new ways

A chemical reaction always produces a new substance with different properties than the starting substances.

• True

• False

Which of the following are true about phase changes and mixing?

• Phase changes and mixing results in atoms combining in new ways

• Phase changes and mixing do not result in atoms combining in new ways

• Phase change and mixing are other examples of a chemical reaction

• Phase changes and mixing do not make new substances.