Density, Acids/Bases, Chemical Reactions

Front

What is density?

Back

Density is the mass of an object divided by its volume, usually expressed in grams per cubic centimeter (g/cm³) or grams per milliliter (g/mL).

Front

How do you calculate density?

Back

Density = Mass / Volume. For example, if a rock has a mass of 14g and a volume of 2cm³, its density is 14g / 2cm³ = 7g/cm³.

Front

What indicates that a chemical reaction has occurred?

Back

Evidence of a chemical reaction includes a precipitate forming, a color change, or a temperature change. All of these are signs of a chemical reaction.

Front

What is pH?

Back

pH is a scale used to measure how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What happens when acids dissolve in water?

Back

When acids dissolve in water, they produce hydrogen ions (H+), which makes the solution acidic.

Front

What is a basic solution?

Back

A basic solution has a pH greater than 7 and contains hydroxide ions (OH-). For example, a pH of 9 indicates a basic solution.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the difference between acids and bases?

Back

Acids produce hydrogen ions (H+) in solution, while bases produce hydroxide ions (OH-).

Front

What is the significance of a pH of 7?

Back

A pH of 7 is considered neutral, meaning the solution is neither acidic nor basic.

Front

If an object has a density of 3.6 g/mL, will it sink or float in water?

Back

It will sink because its density is greater than that of water (1 g/mL).