Unit 4 Chemical Reactions and Equations

Which is the name of the kind of solid substance formed in this figure?  

• aqueous 
• precipitate
• acid
• synthesis 

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NGSS.MS-PS1-2

Provides evidence that a chemical reaction has occurred. 

• dissolving 
• melting
• formation of a gas
• bending

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many Carbons are present on the reactant side?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-1

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

• Yes, the amount of atoms for each element are equal on both the reactant and product side.

• No, the carbons are not the same number on both the reactant and product side.

• No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

• No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

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NGSS.MS-PS1-5

The left side of the equation below is called

• Products
• Reactants

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NGSS.MS-PS1-2

NGSS.MS-PS1-1

The right side of the equation below is called the

• products
• reactants

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction

• The atoms of the reactants always stay together to form the products
• The atoms of the reactants unbond, rearrange, and then rebond to form the products
• New atoms are formed which combine to make the products
• Some atoms disappear while others multiply to form the products

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NGSS.MS-PS1-5

Which of the following is a chemical change rather than a physical change 

• boiling water at 100 C
• chopping up a piece of wood. 
• cooking a cake 
• ice carbon dioxide sublimating to gas 

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NGSS.MS-PS1-2

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

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NGSS.MS-PS1-5

A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process.

Which observation of this process provides evidence of a chemical reaction?

• Hot water heated the aluminum foil.

• The liquid solution changed color.

• The pan was lined with aluminum foil.

• The hot water cooled.

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NGSS.MS-PS1-2