NGSS.HS-PS1-2

A water molecule (H₂O) is an example of a covalent bond because ____.

• The hydrogen gains an electron an the oxygen loses one.  
• Electrons are shared btween the hydrogen and oxygen
• They do not form a eutral goup of atoms. 
• Hydrogen and oxygen are both negative ions.   

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NGSS.HS-PS1-2

 Mg  +  ___ HCl  →   MgCl₂  +   H₂

• 1
• 2
• 3
• 4

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NGSS.HS-PS1-2

Applies principles and techniques of chemistry, physics and geology to crime scene investigation.

• Biology Unit

• Physical Science Unit

• Firearms Unit

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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

Which of the following is an ionic compound:

• CH₄

• I₂

• LiBr

• CO

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NGSS.HS-PS1-2

Which of these contributes to acid rain?

• CO₂

• NaOH

• CaO

• SO₂

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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

What type of bond will this ammonium chloride compound likely form?

• Ionic compound

• Covalent compound

• Metallic compound

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NGSS.HS-PS1-2

Which is the correct formula for the ionic compound that results from these two atoms?

• X₂ Y₅

• X₅ Y₂

• X₂ Y₃

• X₃ Y₂

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NGSS.HS-PS1-2

NGSS.HS-PS1-1

How do the following two elements bond together?
Al³⁺  O^2-         

• AlO
• Al₂O₃
• Al₃O₆
• Al₃O₂

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NGSS.HS-PS1-2