8th Grade: Test: Mass, Mass Conversion, Atoms, Elements ...



8th Grade: Test: Mass, Mass Conversion, Atoms, Elements/Compounds, 3 Phases of Matter

Name________________________________Date____________________Per.6

1. Define mass.

a. Mass is the amount of space an object takes up.

b. Mass tells how much matter is in an object.

c. Mass has a definite volume but no shape.

2. What’s the basic unit of mass?

a. kilograms

b. kilometers

c. kiloliters

3. Which amount below best describes the mass of an average human?

a. 0.5 kg

b. 500 kg

c. 55 kg

4. Convert 454 g to kilograms. Show your work and circle your answer.

5. Define atom.

a. An atom is the smallest piece of matter that still has the identity of its element.

b. An atom is made up of two or more elements that are bonded together.

c. An atom is a substance that has no definite shape, mass, or volume.

6. Define element.

a. An element is the smallest piece of matter that still has the identity of its compound.

b. An element is a substance made up of two or more atoms that are bonded together.

c. An element is a pure substance that cannot be broken down into other elements.

7. Which substance in the list below is NOT an element? Use your periodic table of elements to

help you.

a. cadmium

b. silicon

c. cesium

d. polystyrene

e. nickel

8. Which of the two statements below is true:

a. Elements are made of compounds.

b. Compounds are made of elements.

9. Which of the two statements below is true about the properties of compounds:

a. The properties of compounds are usually different from the properties of the elements that

make up the compound

b. The properties of compounds are usually the same as the properties of the elements that

make up the compound.

10. When combining an atom of sodium, which is a soft, silvery metal, with an atom of chlorine,

which is a greenish, poisonous gas, what do you get?

a. table sugar (sucrose)

b. table salt (NaCl)

c. a mess.

11. When steel (iron) wool is in contact with water, it makes rust. Which statement below best

explains this?

a. The atoms in steel and water change into different atoms to make rust.

b. Matter can change its properties.

12. Write solid, liquid, or gas for each description:

a. no definite shape; high amount of energy between atoms, so they fly away from each

other. ______________

b. definite volume; moderate energy of motion; atoms slide around each other but don’t fly

away from each other. __________________

c. definite volume; low energy of motion between atoms; atoms vibrate but are stuck in

place.

Extra credit:

A ‘kilo’ is how much? ___________

A ‘milli’ is how much? ___________

So, how many grams is a kilogram? ____________

And, how many grams is a milligram? ____________

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