Chemical Reactions in Biology

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

Why must chemical equations be balanced?

• So that the equation doesn't explode

• The reaction won't happen until it is balanced

• Based on the Law of Conservation of Matter, matter cannot be created or destroyed.

• Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e

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NGSS.HS-PS1-7

The right side of the equation below is called the

• products
• reactants

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NGSS.HS-PS1-7

The left side of the equation below is called

• Products
• Reactants

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NGSS.MS-PS1-5

What is the activation energy in a reaction?

• The energy needed for products to be formed

• The energy needed to break products into reactants

• The minimum energy needed to make products

• The minimum energy needed by reactants for them to react

What kind of reaction is this?

• Endothermic
• Exothermic
• Cannot be determined

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NGSS.HS-PS1-4

How does activation energy affect the rate of a chemical reaction?

• Activation energy has no impact on the rate of a chemical reaction.

• Higher activation energy decreases the rate of a chemical reaction.

• Activation energy directly determines the final product of a chemical reaction.

• A lower activation energy increases the rate of a chemical reaction.

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NGSS.HS-PS1-5

Enzymes are considered to be 

• Lipids
• Carbohydrate
• Protein
• Nucleic Acid

What is the purpose  of an enzyme?

• give permission for the reaction
• raise activation energy
• speed up reactions
• control how many reactions occur