Matter and Energy -STAAR Review Day 2

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. It involves the breaking and forming of bonds between atoms.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state, shape, or size.

Front

What are producers in a food chain?

Back

Producers are organisms that can make their own food through photosynthesis, such as plants. They form the base of the food chain.

Front

What is the role of the sun in a food chain?

Back

The sun provides the energy necessary for photosynthesis, which is the process by which producers create food. Every food chain starts with the sun.

Front

What is a food pyramid?

Back

A food pyramid is a graphical representation of the energy flow in an ecosystem, showing the relative amount of energy available at each trophic level.

Front

What is a trophic level?

Back

A trophic level is a position in a food chain or food web, defined by how organisms obtain energy. Examples include producers, primary consumers, and secondary consumers.

Front

What is a precipitate in a chemical reaction?

Back

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

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water. The chemical composition of water remains the same.

Front

What is the difference between a chemical change and a physical change?

Back

A chemical change results in the formation of new substances with different properties, while a physical change does not alter the chemical composition of a substance.