Chemical Reactions Group Quiz 2022

Which of the following models demonstrates the "Law of Conservation of Mass" ?

• F

• G

• H

• J

Which of the following BEST describes a chemical reaction?

• A compound is crushed into a fine powder.

• Atoms break apart into protons, electrons, and neutrons

• Atoms are rearranged into new substances

• Molecules move faster until they fly apart from each other

Which of these is a sign that a chemical change has occurred?

• A change in size

• An unexpected color change

• A temperature change

• A change of state

• Bubbles or gas produced

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same

• that matter can only be changed into new substances by introducing a catalyst

• that matter exists in the same state throughout any chemical change

• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

The materials BEFORE a chemical reaction are called the....

• Reactants

• Products

• Quotient

The materials AFTER a chemical reaction are called the....

• Reactants

• Products

• Quotient

What type of reaction is shown in the photo?

• Exothermic
• Isothermic
• Endothermic
• None of the  above

What type of chemical reaction absorbs heat and feels cold ?

(Chemical ice pack)

• exothermic

• endothermic

Which of the following would react the SLOWEST ?

• A

• B

• C

• D

What type of reaction is shown in the photo?

• Exothermic

• Isothermic

• Endothermic

• None of the above