Unit 4 and Unit 5 Chemistry Review

1 .) The atoms of a certain element each contain 10 protons and 8 valence electron.

Which statement correctly identifies this element and describes its chemical reactivity?

• A The element is Neon, and it is highly reactive.

• B The element is fluorine, and it is not very reactive.

• C The element is Neon, and it is not very reactive.

• D The element is fluorine, and it is highly reactive.

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NGSS.HS-PS1-1

2.) Which types of elements have a full outer shell of Valence Electrons?

• F Metals

• G Noble Gases

• H Metalloids

• J Non-Metals

3.) How many protons are contained in the nucleus of a Fluorine atom?

• A 18

• B 9

• C 36

• D 40

4.) How are the three elements above organized on the periodic table?

• F Niobium and Cobalt are in the same period.

• G Cobalt and Scandium are in the same period.

• H Cobalt and Scandium are in the same group.

• J Niobium and Cobalt are in the same group.

5.) How many valence electrons are in an atom of each element in Group 14 in the

periodic table?

• 14

• 4

• 2

• 6

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NGSS.HS-PS1-1

6.) Which of the following lists all the elements that are present in a molecule of

potassium carbonate, Ca₃(PO₄)₂ ?

• F carbon and oxygen

• G phosphate and calcium

• H calcium, phosphorus, and oxygen

• J potassium, carbon, and oxygen

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NGSS.MS-PS1-1

7.) The formula for baking soda is given.

KMnO₄

This formula indicates that the most basic unit of baking soda contains —

• A 1 magnesium atom, 1 potassium atom, and 3 oxygen atoms

• B 1 potassium atom, 1 magnesium atom, and 4 oxygen atoms atom

• C 1 potassium atom, 1 helium atom, and 1 oxygen atom

• D 1 carbon atom, 1 helium atom, 1 calcium atom, and 3 oxygen atoms

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NGSS.MS-PS1-1

8.) During a chemistry demonstration, a student added liquid hydrochloric acid, HCL, to a

beaker holding powdered baking soda, . The solution in the beaker began to

bubble and fizz as carbon dioxide gas, , escaped. How did combining a liquid and a

solid produce a gas?

• F The atoms in the hydrochloric acid and baking soda combined, forming a product with a different state but the same properties.

• G Adding the hydrochloric acid to the baking soda superheated the hydrochloric acid, causing it to change phases.

• H The atoms in the hydrochloric acid and baking soda rearranged, forming products with different properties.

• J Adding the hydrochloric acid to the baking soda superheated the baking soda, causing it to change phases.

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9.) A scientist performed four investigations using eight different liquids. In each

investigation, the scientist combined two of the liquids under a fume hood and

recorded observations in the table below.

In which investigation is it least likely that the liquids reacted chemically?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-5

10.) Which diagram correctly shows the charges of the particles in a neutral beryllium

atom?

• 
• 
• 
• 

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