G8 PhysSci: End of Semester Review

1.) Water is a substance made up of the elements hydrogen and oxygen. How many types of atoms make up a particle of water?

• 4

• 1

• 3

• 2

Tags

NGSS.MS-PS1-1

2.) A pencil 'lead' is actually made of graphite. Graphite is made exclusively of carbon atoms. Which two terms describe graphite?

• Element

• Mixture

• Compound

• Pure substance

Tags

NGSS.MS-PS1-1

3.) In models of molecules, gray spheres are carbon atoms, white spheres are hydrogen atoms, red spheres are oxygen atoms, and blue spheres are nitrogen atoms. The chemical formula for hydrogen peroxide is H2O2. Which model represents a molecule of hydrogen peroxide?

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Tags

NGSS.MS-PS1-1

4.) What is part of the modern atomic model but no previous model?

• Circular electron paths

• A nucleus

• Electron clouds

• A positive particle

5.) An atom is neutral. Its nucleus contains two protons and two neutrons. How many electrons does the atom have?

• Two

• Three

• Four

• Zero

6.) Lithium has three protons. Which model shows a neutral atom of lithium?

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Tags

NGSS.MS-PS1-1

7.) The diagram shows the box for the element krypton in the periodic table. What is the chemical symbol for this element?

• K

• Krypton

• Kryptonite

• Kr

8.) The columns in the periodic table are called groups. What do the elements in Group 2 have in common?

• They are all highly reactive nonmetals.

• They are all found in nature in their pure forms.

• They tend to form ions with a –2 electric charge

• They tend to form ions with a +2 electric charge.

9.) Where are all the noble gases found in the periodic table?

• Period 7

• Group 18

• Group 1

• Period 1

10.) Which property of matter is best measured using the tool shown?

• Reactivity

• Mass

• Volume

• Ductility