Chemistry EOC Review 2024

How does a scientific theory become a law?

• A hypothesis is written on how/why there is a relationship between two variables.

• Possible explanations are given for the relationship between two variables.

• Many scientists give evidence for the relationship between two variables.

• One scientist finds evidence for a relationship between two variables.

Tags

NGSS.HS-PS2-1

Which is the correct Lewis dot diagram for potassium?

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• 
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Tags

NGSS.HS-PS1-1

What happens when sodium reacts with fluorine to form sodium fluoride?

• Electrons are shared and the bonding is ionic.

• Electrons are shared and the bonding is covalent.

• Electrons are transferred and the bonding is metallic.

• Electrons are transferred and the bonding is ionic.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Covalent bonds occur between two nonmetals. What types of atoms make ionic bonds?

• two nonmetals

• two metal atoms

• a metal and a nonmetal

• noble gases

Which is the correct formula for the compound Iron(II) chlorate?

• Fe(ClO₃)₂

• Fe₂(ClO₃)₁

• Fe(ClO₃)₃

• Fe₃(ClO₃)₂

What two pure substances are present in this solution?

• Water is the only pure substance.

• The ionic solid represented by big green atoms and small white atoms is the only pure substance.

• Water and the ionic solid are the two pure substances.

• The solution of dissociated ions and water is a pure substance.

Tags

NGSS.MS-PS1-1

Which diagram represents the bonding in lithium chloride?

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• 
• 
• 

Tags

NGSS.HS-PS1-3

This is the Lewis dot diagram of the carbon atom. What does having four valence electrons allow carbon to do?

• Carbon can form one covalent bond with other atoms.

• Carbon can form two covalent bonds with other atoms.

• Carbon can form three covalent bonds with other atoms.

• Carbon can form four covalent bonds with other atoms.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the molar ratio of carbon dioxide to oxygen when the following reaction is balanced?
CH₄ + O₂ → H₂O + CO₂

• 2:2

• 1:2

• 1:1

• 2:3

Tags

NGSS.HS-PS1-7

HCl + Fe₂O₃ → FeCl₃ + H₂O

Balance the above equation and determine the molar ratio of Iron(III) Oxide to Iron(III) chloride?

• 1:1

• 1:2

• 1:3

• 1:4

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7