Unit 7 and 8 Review

Unit 7-8 Review

Describe the key characteristics of a chemical reaction.

Watch this video closely!

Categorize

Options (14)

Change in color

Formation of a precipitate

Release of gas

Change in temperature

Formation of a new substance

Change in odor

Change in energy

Change in shape

Change in size

Change in state of matter

Change in texture

Change in density

Change in volume

Change in magnetism

Organize these options into the right categories

Chemical Change

Physical Change

Do you have these answers for number 1?

​Was there a:

• Change in Color

• Creation of a gas

• Creation of a precipitate

• Change in odor/smell

• Change in Temperature

• Light produced

• Atoms are rearranged

Check your review.

Aqueous potassium iodide, KI, is mixed with aqueous lead(II) nitrate, Pb(NO3)2, a yellow solid forms in the clear solution.

Watch and See!

NaOH (s) + H₂O (l) → Na⁺ (aq) + OH^- (aq) + H2O (l)

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Watch and See!

Do you have these answers for #2?
a) A chemical reaction has occurred because there is a change in color, a new substance is formed, and that new substance is a solid precipitate.

b) A chemical reaction has occurred as the ions are no longer bonded to each other but are separated by water molecules. This is known as disassociation.

c) A chemical reaction has occurred as the atoms have been rearranged, new substances have been created, and this is likely a decomposition reaction.

Check your review.

Five steps to easy balancing. Watch the quick video to review.

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Balancing Chemical equations

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​ AgNO_3(aq)  +  CaCl_2(aq)  →  ​

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AgCl_(s)   +   Ca(NO₃)_2(aq)​

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C₂H_6(g)  +  ​ ​

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O_2(g)  →  ​ ​

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CH₃COOH_(g) +​ ​

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H₂O_(g)

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HCl _(aq) +   Ba(OH)_2(aq)   →  ​ BaCl_2(aq)   +  ​ ​

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H₂O(l)​

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Al _(s) +   ​

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O_{2 (g)}   →   ​

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Al₂O_3(s)

Match

Match the type of reaction with the simplified formula example.

• Decomposition

• Single Replacement

• Double Replacement

• Synthesis

• Combustion

AB→A+B

A+BC→AC+B

AB+CD→AD+CB

A+B→AB

A+O₂→CO₂+H₂0

• AB→A+B

• A+BC→AC+B

• AB+CD→AD+CB

• A+B→AB

• A+O₂→CO₂+H₂0

Do you have these answers for #3?

a) 2AgNO3(aq) + CaCl2(aq)  →  2AgCl(s) + Ca(NO3)2(aq); Double

b) 2C₂H_6(g)  +  3O_2(g)  →  2CH₃COOH_(g) +  2H₂O_(g); Combustion/Synthesis

c) 2HCl _(aq) + Ba(OH)_2(aq)   →  BaCl_2(aq)   +  2H₂O(l);Double

d) 4Al_(s) +   3O_2(g)   →  2Al₂O_3(s) ; Synthesis

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Check your review.

Multiple Choice

Which skeletal chemical equation represent the word problem below?

When solid potassium chlorate (KClO₃) is strongly heated in a flame it forms oxygen gas (O₂) and solid potassium chloride (KCl).

• KClO₃→O₂+KCl

• KClO_3(s)→O_2(g)+KCl_(S)

• O_2(g)+KCl_(S)→KClO_3(s)

• O₂+KCl→KClO₃

Multiple Choice

Which skeletal chemical equation represent the word problem below?

Solid zinc and aqueous lead (II) nitrate (Pb(NO₃)₂) react to form aqueous zinc nitrate (Zn(NO₃)₂) and solid lead.

• Zn+Pb(NO₃)₂→Zn(NO₃)₂+Pb

• Zn_(s)+Pb(NO₃)_2(aq)→Zn(NO₃)_2(aq)+Pb_(S)

• Zn_(S)+Pb(NO₃)₂→Zn(NO₃)₂+Pb_(S)

• Zn+Pb(NO₃)_2(aq)→Zn(NO₃)_2(aq)+Pb

Match

Match the following reaction type to the chemical formula.

• Decomposition

• Double Replacement

• Synthesis

• Single Replacement

• Combustion

KClO_3(s)→O_2(g)+KCl_(S)

2AgNO_3(aq)+ MgCl_2(aq)→Mg(NO₃)_2(aq)+2AgCl

2Mg_(s)+O_2(g)→2 MgO_(s)

Zn_(s)+Pb(NO₃)_2(aq)→Zn(NO₃)_2(aq) + Pb_(S)

C₂H_8(g) + 5O2→3CO_2(g) + 4H₂0_(g)

• KClO_3(s)→O_2(g)+KCl_(S)

• 2AgNO_3(aq)+ MgCl_2(aq)→Mg(NO₃)_2(aq)+2AgCl

• 2Mg_(s)+O_2(g)→2 MgO_(s)

• Zn_(s)+Pb(NO₃)_2(aq)→Zn(NO₃)_2(aq) + Pb_(S)

• C₂H_8(g) + 5O2→3CO_2(g) + 4H₂0_(g)

Do you have these answers for #4?

a) KClO_3(s)→O_2(g)+KCl_(S); 2KClO_3(s)→3O_2(g)+2KCl_(S); Decomposition

b) Zn_(s)+Pb(NO₃)_2(aq)→Zn(NO₃)_2(aq)+Pb_(S); Balanced; Single Replacement

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Check your review.

There is a way to determine whether a single replacement reaction will occur. WATCH THE VIDEO!

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Predicting the Future

Multiple Choice

Cu_(s) + 2AgNO_3(aq) → Cu(NO₃)_2(aq) + 2Ag_(s)

• Copper is more reactive than silver; therefore, copper will replace silver.

• Copper is less reactive than silver; therefore, copper will replace silver.

• Copper is more reactive than silver; therefore, Silver will replace Copper.

• Copper is less reactive than silver; therefore, silver will replace copper.

Multiple Choice

Mg_(s) + 2HCl_(aq) → MgCl_2(aq) + H_2(g)

• Magnesium is more reactive than hydrogen; therefore, magnesium will replace hydrogen.

• Magnesium is less reactive than hydrogen; therefore, magnesium will replace hydrogen.

• Magnesium is more reactive than hydrogen; therefore, hydrogen will replace magnesium.

• Magnesium is less reactive than hydrogen; therefore, no reaction will occur.

Multiple Choice

2Na_(s) + 2H₂O_(aq) → 2NaOH_(aq) + H_2(g)

• Sodium is more reactive than hydrogen; therefore, sodium will replace hydrogen.

• Sodium is less reactive than hydrogen; therefore, sodium will replace hydrogen.

• Sodium is more reactive than hydrogen; therefore, hydrogen will replace sodium.

• Sodium is less reactive than hydrogen; therefore, no reaction will occur.

Multiple Choice

Zn_(s) + CaCl_2(aq) → ZnCl_2(aq) + Ca_(s)

• Zinc is more reactive than calcium; therefore, zinc will replace calcium.

• Zinc is less reactive than calcium; therefore, zinc will replace calcium.

• Zinc is more reactive than calcium; therefore, calcium will replace zinc.

• Zinc is less reactive than calcium; therefore, no reaction will occur.

The correct answer are yours!

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