Midterm Exam Review - Chemistry Unit 1

This is an accurate model because...

• It is missing one more CO₂ in the model. 
• Only the reactant side has the correct models for the formulas of each molecule. 
• It has the correct number of molecules and atoms for both sides of the equation. 
• None of the above 

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According to the law of conservation of mass, the number of Carbon, Hydrogen, and Oxygen atoms are the same on both sides of the chemical equation above.

• True

• False

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NGSS.MS-PS1-2

How many atoms of carbon are shown on EACH side of this chemical reaction?

• 1

• 3

• 4

• 5

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NGSS.MS-PS1-1

If there are 4 H atoms on the reactant side, how many H atoms will be on the product side? 

• 2
• 4
• 6
• You need more information to answer this question

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The total amount of matter (atoms) before and after a chemical reaction, remains the same.

• True

• False

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During a chemical reaction, matter cannot be _______ or created.

• bought

• changed

• destroyed

• made

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Which of the following choices is the reactant for the equation above?

• 
• 
• 
• 

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NGSS.MS-PS1-1

Identify the reactant(s) and product(s) of the reaction.

• All three are reactants and none are products.
• Hydrogen and water are the reactants, and oxygen is the product.
• Water and oxygen are the reactants, and hydrogen is the product.
• Hydrogen and oxygen are the reactants, and water is the product.
  

__________ are the substances present before the chemical reaction takes place.

• products

• elements

• compound

• reactants

The _________ are the substances present after the chemical reaction takes place.

• reactants

• compound

• products

• elements

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NGSS.MS-PS1-2