Apologia Chemistry and Physics Unit 4 Quiz
What is the pH of pure water?
7 (neutral)
What is an endothermic reaction?
A chemical reaction during which heat energy is absorbed.
What is an exothermic reaction?
A chemical reaction during which heat energy is released.
What is a polymer?
A molecule made of repeating small molecules combined.
What is a physical reaction?
A physical change that does not change the chemical substance but only the appearance of the substance.
What is a compound?
A pure chemical substance with two or more different elements combined.
What is a chemical reaction?
A reaction that occurs when two or more chemical substances interact with each other and change into different chemical substances.
What is a crystal?
A solid with a regular, repeating arrangement of atoms.
What is a reactant?
The chemicals (elements/molecules) that are being mixed in a chemical reaction.
What is the product of a chemical reaction?
The chemicals (elements/molecules) that are being mixed in a chemical reaction.
Name some bases in your home?
ammonia, baking soda, caustic drain cleaner
What factors can influence the rate of reaction?
increasing the concentration of the compounds that are being combined, heating, catalyst.
What are some physical changes?
melting, boiling, dissolving
Name some man-made polymers?
plastics, nylon, synthetic rubber
Name some natural polymers?
proteins, starch, cellulose, and natural rubber
Name some acids you know about?
vinegar, lemon juice, stomach contents, car battery liquid
