CH 8: Review GameChemical Reactions

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Which of the following is not a sign that a chemical reaction has occurred?

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1. Heat2. Light3. Odor given off4. Gas produced5. Precipitate formed6. Color change

How do you know for sure that a chemical reaction has occurred?

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1. More than 1 sign is evident

2. More than 2 signs are evident

3. The properties change

4. A new substance forms

Which is not true during a chemical reaction?

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1. Energy is created.2. Mass is conserved.3. Atoms are

rearranged.4. Electrons are moved

around.5. Activation energy is

absorbed.

Energy is released when bonds _________ but absorbed when bonds _________.

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1. Form; break2. Break; form

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Energy Diagram for Reactions

A B

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Which energy diagram represented an endothermic reaction?

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1. A2. B3. Both4. Neither

Energy Diagram for a Reaction

A

?

What does the line on the graph in the previous slide represent?

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1. The reactants2. The products3. The activation

energy4. The conservation of

mass5. The energy given off

Energy Diagram for Reactions

B

ab

Section “a” of the graph represents bonds ________ while section “b” represents bonds ________.

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1. Forming; breaking2. Breaking; forming

Energy Diagram for Reactions

A B

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Which is not a factor that can affect the rate of a reaction?

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1. Temperature2. Concentration3. Surface area4. Catalyst5. Activation energy

Which of the following is the general equation for single displacement reactions?

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1. A + X AX2. AX A + X3. A + BX AX + B4. AX + BY AY + BX5. AX + O2 AO + XO

Which of the following is the general equation for double displacement reactions?

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1. A + X AX2. AX A + X3. A + BX AX + B4. AX + BY AY + BX5. AX + O2 AO + XO

Which of the following is the general equation for decomposition reactions?

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1. A + X AX2. AX A + X3. A + BX AX + B4. AX + BY AY + BX5. AX + O2 AO + XO

Which of the following is the general equation for combustion reactions?

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1. A + X AX2. AX A + X3. A + BX AX + B4. AX + BY AY + BX5. AX + O2 AO + XO

What are the products of a combustion reaction involving a hydrocarbon?

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1. Oxygen and water2. An acid and a base3. Carbon dioxide and

water vapor4. A precipitate

Why must a chemical equation be balanced?

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1. To even everything out

2. So you know how much of each substance is needed

3. To satisfy conservation of mass

Which numbers can you adjust to balance a chemical equation?

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1. Subscripts2. Coefficients

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Which of the following is not one of the diatomic elements?

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1. H2. C3. N4. O5. F6. Cl7. Br8. I

What symbol do you use if a reaction is heated?

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1. (s)2. (aq)3. Δ4. ↑5. ↓

When do you use the activity series?

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1. For double displacement reactions

2. For single displacement reactions

3. For exothermic reactions

4. For all reacations

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How do you determine if a precipitate will form in a reaction?

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1. Use the activity series

2. Use the periodic table

3. Use the solubility rules

4. Guess

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