Chemistry 1.0 (7th Grade)

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1. To find the mass of water in a graduated cylinder, you could *

1) Take the total mass of the water and graduated cylinder and subtract the mass of the water

2) Take the total mass of the water and graduated cylinder and subtract the mass of the graduated cylinder

3) Add the mass of the water to the mass of the graduated cylinder

4) Take the total mass of the water and graduated cylinder and divide the mass by two

2. An object should float in a liquid if it is *

1) More dense than the liquid

2) Less dense than the liquid

3) Lighter than metal

4) Shaped like a ball

3. Density is a physical property of a substance. This means that the density of water *

1) Changes depending on the volume

2) Stays the same regardless of the volume

3) Is greater for a greater mass of water

4) Is less for a smaller mass of water

4. The three basic components of an atom are: *

1) protons, neutrons, and ions

2) protons, neutrons, and electrons

3) protons, neutrinos, and ions

4) protium, deuterium, and tritium

5. An element is determined by the number of: *

1) atoms

2) electrons

3) neutrons

4) protons

6. The nucleus of an atom consists of: *

1) electrons

2) neutrons

3) protons and neutrons

4) protons, neutrons, and electrons

7. A single proton has what electrical charge? *

1) no charge

2) positive charge

3) negative charge

4) either a positive or negative charge

8. The atomic number of an atom is: *

1) the number of electrons

2) the number of neutrons

3) the number of protons

4) the number of protons plus the number of neutrons

9. Chemical or Physical Change *

Indicate with a ‘Physical’ or a ‘Chemical’ which type of change is taking place.

Chemical Change

Physical Change

glass breaking

mixing salt and water

hammering wood together

mixing oil and water

a rusting bicycle

water evaporating

melting butter

cutting grass

separate sand from gravel

burning leaves

bleaching your hair

fireworks exploding

frying an egg

cutting your hair

squeeze oranges for juice

crushing a can

melting ice

boiling water

Elements, Compounds, and Mixtures

10. Classify each of the pictures below by checking the box with the correct label. *

Element

Compound

Mixture of elements

Mixture of compounds

Mixture of elements and compounds

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