Unit 2 Test Review

In chemical formulas, what do the tiny numbers (subscripts) represent?

• The number of molecules

• The number of atoms of the element

• The number of chemical reactions

• The number of products formed

Tags

NGSS.MS-PS1-1

How many molecules of Na₂SO₄ are present?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many atoms of Sodium are present?

• 3

• 6

• 12

• 9

Tags

NGSS.MS-PS1-1

Is the chemical equation 2Fe₂O₃ + 3C → 4Fe + 3CO₂ balanced?

• Yes, it is balanced.

• No, there are more carbon atoms on the reactant side.

• No, there are more oxygen atoms on the product side.

• No, there are more iron atoms on the product side.

Tags

NGSS.MS-PS1-5

Is the chemical equation Br + 3Li₂ → LiBr₂ balanced?

• Yes, it is balanced.

• No, there are more lithium atoms on the reactant side than the product side.

• No, there are more bromine atoms on the product side than the reactant side.

• No, there are more lithium atoms on the product side than the reactant side.

Tags

NGSS.MS-PS1-5

The law of conservation of mass states that matter ​ (a)   ​ be ​ (b)   or ​ destroyed, it can only ​ (c)   forms. This means there ​ (d)   be the same ​ (e)   and type of atoms on both sides of a chemical equation.

• created
• change
• cannot
• must
• number

Tags

NGSS.MS-PS1-5

Match the following

• bond non-metals to non-metals

• Ion

• an atom with a charge

• Ionic bonds

• an atom with a positive charge

• Cation

• bond metals to non-metals

• Covalent bonds

• an atom with a negative charge

• Anion

Tags

NGSS.MS-PS1-1

Match the group to its oxidation number.

• -1

• Nitrogen Group

• -3

• Noble Gases

• +1

• Alkaline Earth Metals

• +2

• Alkali Metals

• 0

• Halogens

Tags

NGSS.HS-PS1-1

Label the PTOE correctly.

a

b

c

d

Metalloids

One more non-metal

Non-metals

Metals

Select the period.