CAST Review (7th Grade Concepts)

Front

What are molecules or compounds?

Back

Molecules are groups of two or more atoms bonded together. Compounds are substances formed when two or more different elements are chemically bonded.

Front

Why do embryos of different species look similar?

Back

Some developmental processes are shared by vertebrates, leading to similarities in early stages of development.

Front

Where are the reactants located in a chemical equation?

Back

The reactants are on the left side of the arrow in a chemical equation.

Front

What happens to the sea urchin population when the kelp population increases?

Back

The sea urchin population decreases as the kelp population increases.

Front

What is the total mass of reactants in a chemical reaction?

Back

The total mass of the reactants is conserved and equals the total mass of the products.

Front

Define a chemical bond.

Back

A chemical bond is a lasting attraction between atoms, ions, or molecules that enables the formation of chemical compounds.

Front

What is the significance of DNA in vertebrate embryos?

Back

DNA contains the genetic information that guides the development and characteristics of the organism.

Front

Explain the concept of conservation of mass.

Back

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

Front

What is a food web?

Back

A food web is a complex network of feeding relationships among organisms in an ecosystem.

Front

What is the role of producers in an ecosystem?

Back

Producers, like plants, convert sunlight into energy through photosynthesis, forming the base of the food web.