Science STAAR Review Retake Flashcard

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties. Example: Burning wood.

Front

What happens to the speed of an object if the net force acting on it is zero?

Back

The speed remains constant.

Front

What is the role of chlorophyll in photosynthesis?

Back

Chlorophyll absorbs sunlight to convert it into chemical energy.

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.

Front

What is Newton's Second Law of Motion?

Back

The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F=ma).

Front

What is Newton's Third Law of Motion?

Back

For every action, there is an equal and opposite reaction.

Front

What are primary producers in an ecosystem?

Back

Primary producers are organisms that produce energy available for other organisms in the ecosystem, primarily through photosynthesis. Example: Algae.

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition (e.g., melting ice), while a chemical change results in the formation of new substances (e.g., burning wood).

Front

What is the Law of Universal Gravitation?

Back

The Law of Universal Gravitation states that every point mass attracts every other point mass in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.