8th Grade Science Semester 1

Front

What should NOT be worn during a laboratory activity?

Back

Sandals, dangling jewelry, and loose clothing should NOT be worn during a laboratory activity.

Front

What is the electron configuration of oxygen?

Back

The electron configuration of oxygen is 1s2 2s2 2p4.

Front

What should you do if a fire erupts in the lab?

Back

Immediately notify the teacher.

Front

What does a pH level of 7 indicate?

Back

A pH level of 7 indicates a neutral solution.

Front

Which of the following is the strongest base: soap (pH 10), HCl (pH 0), blood (pH 7.45), or soft drink (pH 3)?

Back

Soap with a pH of 10 is the strongest base.

Front

What is the definition of a base in chemistry?

Back

A base is a substance that can accept hydrogen ions (H+) or donate electron pairs.

Front

What is the definition of an acid in chemistry?

Back

An acid is a substance that can donate hydrogen ions (H+) in a solution.

Front

What is the purpose of a fire extinguisher in a laboratory?

Back

A fire extinguisher is used to put out small fires and prevent them from spreading.

Front

What is the significance of the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (acidic) to 14 (basic), with 7 being neutral.

Front

What safety equipment should be used in a laboratory?

Back

Safety goggles, gloves, and lab coats should be worn to protect against chemical spills and accidents.