Physical Science Review 4

How do you find the number of protons an element has?

• atomic number
• rounded average atomic mass
• rounded average atomic mass minus the atomic number
• the A group

An ice cube is just starting to melt. The water is most likely ___.

• 0 ⁰C and losing energy
• 0 ⁰C and gaining energy
• 100 ⁰C and losing energy
• 100 ⁰C and gaining energy

In a periodic table, rows are called _____. 

• periods
• columns
• families

How would you balance this equation?

• Write a 2 in front of the ammonium (NH₃) and a 3 in front of the hydrogen atom
• Write a 3 in front of the nitrogen and a 3 in front of the hydrogen atom
• This equation is already balanced
• Write a 2 in front of the nitrogen atom and a 2 in front of the hydrogen atom

A(n) ___ opens and closes a circuit.

• key
• magnet
• switch
• electromagnet

The ___ group in an experiment does not receive the variable from the experimenter.

• independent
• dependent
• control
• constant

Students performed a lab with a ramp, books, and a matchbox car to find out how the surface of the ramp will affect the rolling distance. What is the dependent (outcome) variable?

• height of ramp
• rolling distance
• surface of ramp
• height and surface of ramp

Jack was rolling a matchbox car down a ramp. He was wondering what would happen if the ramp was steeper. What is the independent variable?

• the angle of the ramp
• the surface of the ramp
• the length of the ramp
• the distance the car rolls

All of these are true about sound EXCEPT ___.

• sound travels fastest through solids
• sound is a type of energy
• sound is vibrations
• sound travels faster as temperature decreases

What is the speed and direction of the car at 35 minutes?

• 0 m/min
• 6 m/min closer
• 20 m/min closer
• 20 m/min farther