Eighth Grade Matter and Structure

What's in this quiz

1. What decides which element an atom is?

   • Total mass
   • Number of neutrons
   • Number of protons
   • Number of electrons

2. A ____ is two or more elements chemically bonded in a fixed ratio.

   • compound
   • mixture
   • isotope
   • molecule

3. Sublimation is when a liquid changes directly into a gas.

   • True
   • False

4. Which quantity changes with location?

   • Element type
   • Number of atoms
   • Weight
   • Mass

5. Radiation is the only heat transfer that needs no matter at all.

   • True
   • False

6. ____ is the number of waves passing a point each second, measured in hertz.

   • Speed
   • Wavelength
   • Amplitude
   • Frequency

7. Which type of wave is sound?

   • Longitudinal
   • Electromagnetic
   • Reflected
   • Transverse

8. In a parallel circuit, if one bulb goes out the others stay lit.

   • True
   • False

9. Newton's second law says force equals mass times what?

   • Acceleration
   • Time
   • Velocity
   • Distance

10. A stretched rubber band stores ____ potential energy.

    • kinetic
    • thermal
    • gravitational
    • elastic

11. An endothermic reaction makes its surroundings feel warmer.

    • True
    • False

12. What is the unit used to measure force?

    • Joules
    • Newtons
    • Ohms
    • Volts

13. Heat always flows from a warmer object to a ____ one.

    • larger
    • cooler
    • denser
    • hotter

14. Newton's third law forces cancel out because they act on the same object.

    • True
    • False

15. A mixture of sand and iron filings can be separated with a:

    • Chemical reaction
    • Magnet
    • Melting
    • Battery