7th Grade Science Benchmark Review

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants use sunlight to convert carbon dioxide and water into glucose (sugar) and oxygen.

Front

What is the role of chloroplasts in plants?

Back

Chloroplasts are organelles in plant cells where photosynthesis occurs, allowing plants to convert sunlight into energy.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties and can be separated by physical means.

Front

What is the difference between a substance and a mixture?

Back

A substance has a uniform and definite composition, while a mixture contains two or more substances that can vary in composition.

Front

What is the water cycle?

Back

The water cycle is the continuous process by which water evaporates from the Earth's surface, condenses in the atmosphere, and precipitates back to the surface.

Front

What is the significance of rock strata?

Back

Rock strata provide information about the Earth's history, including the relative ages of rocks and the events that shaped the planet.

Front

What is molecular weight?

Back

Molecular weight is the mass of a molecule, calculated as the sum of the atomic weights of all atoms in the molecule.

Front

What does it mean for substances to be chemically different?

Back

Substances are chemically different if they have different molecular structures or arrangements of atoms.

Front

What is correlation in scientific studies?

Back

Correlation refers to a relationship or connection between two variables, indicating that when one changes, the other tends to change as well.

Front

What is the principle of conservation of mass?

Back

The principle of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.