PS CFA4 - Reactions RTI

A balanced equation demonstrates...

• The law of conservation of mass

• The law of conservation of energy

• There was an exothermic reaction

• Matter can be created and destroyed in a chemical reaction. 

Tags

NGSS.MS-PS1-5

There are 5 grams of carbon on the reactant side of a chemical equation,.

How many grams of carbon will be on the product side of the equation?

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

The modeled chemical equation is:

• Balanced, there are two elements on each side

• Unbalanced, there are too many atoms in the products

• Unbalanced, there are too many atoms in the reactants

• Balanced, there are two molecules on each side

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which set of products would make a balanced equation with the reactants shown?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How many Oxygen (red) atoms are missing from the products of this equation?

• 0

• 1

• 2

• 3

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Chemical equations must be balanced because...

• energy has been created and destroyed

• the law of concentration of energy

• there was an exothermic reaction

• matter cannot be created or destroyed

Tags

NGSS.MS-PS1-5

Will the mass of the sealed jar and its contents change or stay the same as the candle burns out?

• CHANGE

  The mass will increase as smoke is made

• CHANGE

  The mass will decrease as the candle burns and gets smaller.

• STAY THE SAME

  The mass will not change. It is a closed system and nothing can enter or exit the jar.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of the following models best demonstrates a balanced chemical equation?

• F
• G
• H
• J

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

How do chemical reactions form new substances?

• the elements break apart into protons, neutrons, and electrons

• the atoms mix together and create new elements

• the molecules break apart and new bonds form making new molecules

• the compounds mix in water to form solutions

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What happens to atoms in a chemical reaction?

• atoms are removed to form new substances

• atoms are rearranged to form new substances

• atoms changed shape to form the same substances

• atoms were added to form more of the same substances

Tags

NGSS.MS-PS1-5