STAAR Science 8th Grade Review

Front

What happens when two balls of different mass collide?

Back

The smaller mass moves with greater acceleration away from the larger mass.

Front

What is essential to predict when a comet will collide with a planet?

Back

Understanding the gravitational attraction that exists between all bodies.

Front

How many different elements are involved in the reaction CH4 + 2O2 → CO2 + 2H2O?

Back

Three.

Front

What is the name of the moon phase that occurs after the first quarter and before the full moon?

Back

Waxing Gibbous.

Front

What energy change occurs when a match is rubbed against sandpaper and starts to burn?

Back

The chemical energy stored in the match changes to thermal energy and light energy.

Front

What is the law of conservation of energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.

Front

Define acceleration.

Back

Acceleration is the rate of change of velocity of an object.

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.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.