8th Grade Science Semester Exam

Front

What determines the identity of an element?

Back

The number of protons in an element's atoms determines the element's identity.

Front

What is a proton?

Back

A proton is a subatomic particle with a positive charge and a mass similar to that of a neutron.

Front

What is the significance of groups in the periodic table?

Back

Elements in the same group of the periodic table tend to have similar chemical properties.

Front

What is net force?

Back

Net force is the overall force acting on an object when all the individual forces are combined.

Front

What happens when two skaters push away from each other?

Back

The net force on the mother and daughter is 0 N, as they exert equal and opposite forces.

Front

What is the mass of a neutron compared to a proton?

Back

A neutron has a mass similar to that of a proton.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is acceleration?

Back

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

Front

What is the role of forces in motion?

Back

Forces cause objects to accelerate, decelerate, or change direction.

Front

What is the difference between mass and weight?

Back

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