NGSS.HS-PS1-2

Ca⁺² combines with Br^- to form

• Ca₂Br₂
• CaBr
• Ca(br)₂
• CaBr₂

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NGSS.HS-PS1-2

hydrobromic acid

• HBrO₃
• HBr
• HBr₂
• HBrO

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NGSS.HS-PS1-2

The breakdown of stratospheric ozone
I. can originate from the emission of chlorofluorocarbons (CFCs).
II. is catalyzed through a free chlorine (Cl) atom.
III. prevents UV rays from reaching the earth’s surface.

• I only
• III only
• I,&II
• I,II,& III

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NGSS.HS-PS1-2

Which of the following represent acid rain? (select all that apply)

• pH 3.6

• pH 5.1

• pH 5.5

• pH 5.6

• pH 7

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NGSS.HS-PS1-2

Metals create _________ ions, because they give away (lose) electrons.

• positive

• negative

• neutral

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NGSS.HS-PS1-2

The breakdown of stratospheric ozone;

I. Can originate from the emission of chlorofluorocarbons (CFCs).

II. Is catalyzed through a free chlorine (Cl) atom.

III. Prevents all UV rays from reaching the earth’s surface.

• I only

• III only

• I,&II

• I,II,& III

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NGSS.HS-PS1-2

What is A and B ?

• A - Hydrogen

  B - Nitrogen

• A - oxygen

  B - Hydrogen

• A - Hydrogen

  B - oxygen

• A - Nitrogen

  B - Hydrogen

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NGSS.HS-PS1-2

The formation of a covalent bond relies on the interaction or bonding of...

• 2 Nonmetals

• 1 Nonmetal & 1 Metal

• 2 Metals

• 2 Noble Gases

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NGSS.HS-PS1-2

How many covalent bonds are created in a single water molecule?

• 0

• 1

• 2

• 3

• 4

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NGSS.HS-PS1-2

How many pairs of valence electrons are being shared in a single water molecule?

• 0 pair - 0 valence electrons

• 1 pair - 2 valence electrons

• 2 pair - 4 valence electrons

• 3 pair - 6 valence electrons

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NGSS.HS-PS1-2