7th Grade Science Benchmark Review

Front

What is a unicellular organism?

Back

An organism that consists of a single cell, which performs all necessary functions to maintain life.

Front

What is the main characteristic of gas molecules in a closed container?

Back

Gas molecules are widely spaced and move freely, filling the entire volume of the container.

Front

What property cannot be used to determine if two substances are the same?

Back

Mass, because different substances can have the same mass.

Front

What are the resources needed for photosynthesis?

Back

Energy from the sun, water, and carbon dioxide in the air.

Front

What does conservation of matter mean in a chemical reaction?

Back

Matter is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is photosynthesis?

Back

The process by which plants use sunlight to convert carbon dioxide and water into glucose and oxygen.

Front

What is the difference between a solid, liquid, and gas?

Back

Solids have a fixed shape and volume, liquids have a fixed volume but take the shape of their container, and gases have neither fixed shape nor volume.

Front

What is density?

Back

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

Front

What is the role of chlorophyll in photosynthesis?

Back

Chlorophyll is the green pigment in plants that absorbs sunlight for photosynthesis.

Front

What is a chemical reaction?

Back

A process that involves the transformation of substances through the breaking and forming of chemical bonds.