Chemical Reactions Key Concepts Bell Ringer

What are the starting substances in a chemical reaction called?

• Reactants

• Atoms

• Products

• Properties

During a chemical reaction, do atoms change from one type to another?

• Not sure

• Sometimes

• No

• Yes

What happens to the atoms during a chemical reaction?

• They change from one type to another

• They rearrange to form products

• They disappear

• They become larger

Do the new substances formed in a chemical reaction have the same properties as the old substances?

• Not sure

• Sometimes

• No

• Yes

Can atoms be created or destroyed during a chemical reaction?

• Yes

• No

• Sometimes

• Not sure

What is the Law of Conservation of Mass?

• The total mass of the reactants is not related to the total mass of the products

• The total mass of the reactants is greater than the total mass of the products

• The total mass of the reactants is less than the total mass of the products

• The total mass of the reactants is equal to the total mass of the products

What do scientists analyze to determine if a chemical reaction has occurred?

• Melting point

• Boiling point

• Density

• All of the above

What is the Law of Conservation of Matter?

• The total mass of the reactants is not related to the total mass of the products

• The total mass of the reactants is equal to the total mass of the products

• The total mass of the reactants is less than the total mass of the products

• The total mass of the reactants is greater than the total mass of the products

What properties of substances can be analyzed to determine if a chemical reaction has occurred?

• Odor

• Flammability

• Solubility

• All of the above

What do substances consist of that give them different properties?

• Different groups of atoms

• Different types of atoms

• Different arrangements of atoms

• Different numbers of atoms