NGSS.HS-PS1-4

The force that hold two atoms together is called a ______. 

• Chemical Change
• Reaction
• Chemical Bond
• Physical Change

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NGSS.HS-PS1-4

Combustion is another word for __________.

• Transportation
• Respiration
• Fossil Fuels
• Burning

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NGSS.HS-PS1-4

In an endothermic reaction, heat is ...

• taken in

• given out

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NGSS.HS-PS1-4

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

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NGSS.HS-PS1-4

When Ignited , gunpowder expands

• eight times its original size, providing a violent explosion

• six times its original size, providing a violent explosion

• ten times its original size, providing a violent explosion

• one hundred times its original size, providing a violent explosion

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NGSS.HS-PS1-4

A positive ΔH means that:

• In order for the reaction to happen, heat must be input. It is exothermic

• In order for the reaction to happen, heat must be input. It is endothermic.

• When the reaction happens, heat is released. It is exothermic

• When the reaction happens, heat is released. It is endothermic

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NGSS.HS-PS1-4

What will ΔH be if there is 1 mole of oxygen?

4Fe(s) + 3O₂(g) --> 2Fe₂O₃(s) ΔH = –1500 kJ

• -500 kJ

• 500 kJ

• -750 kJ

• -4500 kJ

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NGSS.HS-PS1-4

The bond energy in a S=O bond is a little more than 100 Kj. If the molecule SO₂ is made, how much energy is released during the formation of these bonds?

• About 50

• About 100

• About 200

• About 400

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NGSS.HS-PS1-4

When writing an endothermic reaction, heat energy is stated as

• product
• catalyst
• reactant

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NGSS.HS-PS1-4

A +  B <--> C + D   ΔH= 151kJ
Rewrite the above equation with energy as a reactant or product:

• A +  B <--> C + D + energy
• A +  B + energy <--> C + D 

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NGSS.HS-PS1-4