Elements and compounds are classifications of:
A. formulas.
B. ions.
C. mixtures.
D. pure substances.

What is the impact of a pH higher than 4.6 in food products?
A. The food is at risk for bacterial contamination.
B. The food is considered highly acidic.
C. The food must be diluted before eating.
D. The food will spoil slowly.

Which action will result in a chemical change?
A. Chilling a vinaigrette
B. Cooking vegetables
C. Puréeing carrots
D. Sweetening tea

Heating shortening to melt is an example of a/an:
A. endothermic reaction.
B. heat capacity.
C. phase change.
D. source of radiation.

Which is an example of a physical change?
A. Soaking vanilla beans in vodka to create extracts
B. Frying onions and garlic
C. Freezing punch rings
D. Fermenting grapes

NaC , KHC H O , and NaCl are examples of:
A. compounds.
B. elements.
C. equations.
D. gases.

Alex noticed that the juice of a lemon is sour and the peel is bitter. Which conclusion is accurate?
A. Lemon juice is basic.
B. Lemon peel is basic.
C. Lemons are acidic.
D. Lemons are basic.

Which change results when water and baking powder are mixed?
A. Chemical
B. Latent
C. Phase
D. Physical

Which type of energy is produced by microwave ovens and stove coils?
A. Chemical
B. Electrical
C. Kinetic
D. Radiant

The process of pasteurization on milk and other dairy products is an example of:
A. a chemical change
B. changing size and shape
C. changing temperature
D. changing phase

Carl has determined that hydrogen will bond with one other atom. Which part of the periodic table did he use?
A. Atomic mass
B. Atomic number
C. Element
D. Symbol

Soap, baking soda, and egg white are examples of items that are:
A. acidic.
B. basic.
C. neutral.
D. pure substances.

Which observation is caused by a chemical change?
A. Bubbles rise in a bottle of cola when opened.
B. Chopped onions release strong odors.
C. Frozen peas become an olive green after cooking.
D. Ice occupies more space than the water used.

Frying a steak over a stovetop and sautéing brussels sprouts are examples of which type of heat transfer?
A. Conduction
B. Convection
C. Radiation
D. Solar

In which phase change is latent heat being released?
A. Evaporation
B. Freezing
C. Melting
D. Sublimation

C, O, and Cl are examples of:
A. compounds.
B. gases.
C. metals.
D. symbols.

What impact does aging have on the pH of eggs?
A. Decreases the acidity
B. Increases the acidity
C. Moves closer to a neutral pH
D. No measurable change

Which is an example of a chemical change?
A. Smelling vanilla flavoring
B. Chopping onions and garlic
C. Freezing punch rings
D. Fermenting grapes

Which source of radiant heat is more likely to result in uneven heat distribution?
A. Electric coils
B. Irradiation
C. Microwaves
D. The sun

Which observation is caused by a physical change?
A. Ice gathered on the inside of a machine used for freeze-drying food.
B. Sautéed mushrooms releasing an earthy odor.
C. Frozen peas become an olive green after cooking.
D. Cucumbers become a dark green after pickling.

Potassium, oxygen, and chlorine are examples of:
A. elements.
B. gases.
C. metals.
D. symbols.

What is a difference between an acid and a base?
A. Acids have a negative charge.
B. Acids produce surplus hydroxyl ions.
C. Bases have a negative charge.
D. Bases produce surplus hydrogen ions.

What do indicator and titration methods have in common?
A. They measure the power of alcohol ions.
B. They measure the power of hydrogen ions.
C. They measure the power of neutral ions.
D. They measure the power of sodium ions.

Which type of energy is created by the movement of electrons?
A. Chemical
B. Electrical
C. Nuclear
D. Radiant

Which of the following types of phase change is defined as: "When anything solid turns into a gas without first becoming liquid"?
A. Evaporation
B. Freezing
C. Melting
D. Sublimation