CGA REVIEW2

8/13/2019 CGA REVIEW2

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CGA #2 Revie

Physical/ Chemical Changes

Directions: For numbers 1!" circle whether a hysical or

chemical change is ta$ing lace%

1. Frying an egg: Physical or Chemical

2. Chopping wood: Physical or Chemical

3. Bleaching your hair: Physical or Chemical

4. Mil going sour: Physical or Chemical

!. Cu""ing your hair: Physical or Chemical

Forming an& 'aming Comoun&s

Directions: For numbers 1(" write the name o) the comoun&%

1. Mg3P2 #$ype 1 %onic& _______________________________________________

2. C'2 #$ype 1 %onic& _______________________________________________

3. (u%4 #$ype 2 %onic& _______________________________________________

4. Cu%3 #$ype 2 %onic& _______________________________________________

!. NBr3 #Co)alen"& _______________________________________________

*. +F3 #Co)alen"& _______________________________________________

Directions: For numbers *1+" tell me the ionic charge o) each element% ,-etals are .0 an& 'on

-etals ..

,. +r _______________________

-. ________________________

/. P ________________________

10. i ________________________

Directions: For numbers 111(" write the chemical euation%

11. +odium Chloride #$ype 1 %onic& _______________________________________________



12. Magnesium +ulide #$ype 1 %onic& _______________________________________________

13. Nioium #& chloride #$ype 2 %onic& _______________________________________________

14. Copper #%%& Fluoride #$ype 2 %onic& _______________________________________________

1!. Caron Monoide #Co)alen"& _______________________________________________

1*. Ni"rogen $riluoride #Co)alen"& _______________________________________________

Counting Atoms

Directions: For numbers 13" in&icate how much o) each atom is resent%

1. 3C3H6 C=______ H=______

2. 5AgBr Ag=_____ Br=______

3. NH4Cl N=______ H=______ Cl=______

4. Na3(PO4)3 Na=_____ P=______ O=______

4alancing Chemical 5uations

Directions: For numbers 1!" balance the euations%

1. _____Hg +_____ Br 2 _____Hg2Br 2

2. _____H2 + ______O2 ______H2O

3. _____Cl2 + ___F2 ___ClF3

4. ________S + ________ KClO3 _______SO2 + _______KCl



!. _______Cu + _______AgNO3 _______Cu(NO3)2 + _____Ag

6yes o) Reactions / Activity 7eries

Directions: For numbers 18" in&icate i) the reaction is: 79'657;7" D5C<-P<7;6;<'" 7;'G=5

D;7P=AC5-5'6" D<>4=5D;7P=AC5-5'6" or C<-4>76;<'%

1. 52' 6 72'→ 2 5'7 ________________________________

2. 2 C272 6 ! '2 4 C'2 6 2 72'

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3. (l2#+'4&3 6 3 Ca#'7&2 → 2 (l#'7&3 6 3 Ca+'4

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4. C 6 72'→ C' 6 72

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!. 2 72'2 → 2 72' 6 '2 ___________________________________________________

*. Ni#Cl'3&2 NiCl2 6 3 '2

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,. P2'! 6 3 72' 2 73P'4

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-. 2 72 6 '2 2 72'

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Directions: For numbers ?11" use the activity seri

to &etermine the ro&ucts% ;) no reaction ta$es lace" write .'R

/. ____Ca + ____Pb(NO3)2

10. ____Na + ____MgCl4

11. ____Al + ____AuSO4

Reaction Rates

Directions: For numbers 18" choose the correct answer%

1. In the reaction 2Mg(s) + O2(g) 2MgO (s), as the surface area of Mg(s) increases, the rate of the reaction:

a. Decreases b. increases c. remains the same c. depends on the amount of oxygen present

2. onsider the fo!!o"ing e#uation:

Mg(s) + 2$2O (!) Mg(O$)2 + $2 (g)

%or the reaction to occur at the fastest rate, & g of Mg(s) shou!d be added in the form of:

a. 'arge chuns

b. ma!! chuns

c. * ribbon

d. * po"der



. Increasing the temperature increases the rate of a reaction by

a. !o"ering the actiation energy

b. increasing the actiation energy

c. !o"ering the fre#uency of effectie co!!isions bet"een reacting mo!ecu!es

d. increasing the fre#uency of effectie co!!isions bet"een reacting mo!ecu!es

-. hich set of reaction conditions produces $2(g) at the fastest rate/

a. a &.0 g !ump of 1n(s) in 0 m' of 0.M $!(a#) at 203

b. a &.0 g !ump of 1n(s) in 0 m' of 0.M $!(a#) at 03

c. a &.0 g po"dered 1n(s) in 0 m' of 0.M $!(a#) at 203

d. a &.0 g po"dered 1n(s) in 0 m' of 0.M $!(a#) at 03

. 4ien the e#uation:

%e(s) + 2$!(a#) → %e!2(a#) + $2(g) 5his reaction occurs more #uic!y "hen po"dered iron is used

instead of a sing!e piece of iron of the same mass because the po"dered iron:

a. acts as a better cata!yst than the sing!e piece of iron

b. absorbs !ess energy than the sing!e piece of iron

c. has a sma!!er surface area than the sing!e piece of iron

d. is more meta!!ic than the sing!e piece of iron

6. Increasing the temperature of a solution will generally

a. Increase the rate at which a solute dissolvesb. Increase the amount of solute that dissolves

c. Both A and Bd. Neither A or B

7. Which of the following would ensure that a reaction would proceed at a quicer rate!

a. Increasing the temperature and using larger pieces.

b. "owering the temperature and stirring the solution.c. #tirring the solution and grinding the pieces into a powder.d. "owering the temperature and using larger pieces.

$. %ach beaer shown below contains one liter of water. &ne hundred grams of sugar is added to each beaer.In which beaer will the sugar dissolve the fastest!



(.

B.



7toichiometry

Directions: )or numbers 1*" )in& the -olar -ass%

Example: NaBr (1 x 23) + (1 x 80) = 103 g/mol

1. Ca(OH)2

2. Na3PO4

3. C6H12O6

4. (NH4)2

!. Ca(NO3)2

6. 8Cl2O

,. 4"2CO3



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CGA REVIEW2