Question 1

What are the reactants of this chemical equation $2H_2$+$O_2$=$H_2O$?

Accepted Answer

$H_2$ and $O_2$

Answer

$H_2$

Answer

$O_2$

Answer

$H_2O$

Question 2

What are the products of this chemical equation $2H_2$+$O_2$=$H_2O$?

Accepted Answer

$H_2O$

Answer

$H_2 and O_2$

Answer

$O_2$

Answer

$H_2$

Question 3

What is the number "2" in front of the $H_2$?   $2H_2$+$O_2$=$H_2O$?

Accepted Answer

Coefficient

Answer

subscript

Answer

atoms

Answer

superscript

Question 4

Is this reaction balanced?  $2H_2$+$O_2$=$2H_2O$

Accepted Answer

Yes

Answer

No

Question 5

Why is there not a coefficient in for $0_2$?  Is this reaction balanced?  $2H_2$+$O_2$=$2H_2O$

Accepted Answer

When the coefficient would be "1", it is omitted

Answer

What are coefficients?

Answer

A Zero looks to much like the "O"

Answer

The equation is not balanced correctly.

Question 6

How many hydrogen atoms are needed to produce two  $H_2O$ molecules? $2H_2$+$O_2$=$H_2O$

Accepted Answer

4

Answer

2

Answer

1

Answer

0

Question 7

How many oxygen atoms are needed to produce two $H_2O$ molecules?  $2H_2$+$O_2$=$H_2O$

Accepted Answer

2

Answer

1

Answer

0

Answer

4

Question 8

How many hydrogen molecules are needed to produce two $H_2O$?  $2H_2$+$O_2$=$H_2O$

Accepted Answer

2

Answer

0

Answer

1

Answer

4

Question 9

How many oxygen molecules are needed to produce two $H_2O$ molecules?  $2H_2$+$O_2$=$H_2O$

Accepted Answer

1

Answer

0

Answer

4

Answer

2

Question 10

Balance the following equation:  Fe(s) + $O_2$(g) = $Fe_2O_3$(s)

Accepted Answer

4,3,2

Answer

8,6,4

Answer

1,2,3

Answer

3,2,4

Question 11

Balance the following equation:  Co(s) + $H_2O$(l) = $Co_2O_3$(aq) + $H_2$(l)

Accepted Answer

2.3,1,3

Answer

3,1,3,2

Answer

3,2,1,3

Answer

1,2,3,3

Question 12

Write the balance equation:  Aluminum metal reacts with copper(II) chloride to produce aluminum chloride and copper metal.

Accepted Answer

2 Al(s) + 3 $CuCl_2$(aq) = 2 $AlCl_3$(aq) + 3 Cu(s)

Answer

2 Al(s) + 2 $CuCl_2$(aq) = 2 $AlCl_3$(aq) + 3 Cu(s)

Answer

2 Al(s) + 2 $CuCl_2$(aq) = 2 $AlCl_3$(aq) +  Cu(s)

Answer

3 Al(s) + 3 $CuCl_2$(aq) =  $AlCl_3$(aq) + 3 Cu(s)

Question 13

Write the balance equation:  Lead(IV) sulfide reacts with oxygen gas to produce lead(IV) oxide and sulfur dioxide.

Accepted Answer

$PbS_2$ +3  $O_2$ = $PbO_2$ + 2 $SO_2$

Answer

$PbS_2$ +3  $O_2$ = 2 $PbO_2$ + 2 $SO_2$

Answer

2 $PbS_2$ +3  $O_2$ = $PbO_2$ + 2 $SO_2$

Answer

2 $PbS_2$ +3  $O_2$ = 2 $PbO_2$ + 2 $SO_2$

Question 14

Balance the chemical equation with phases:  Rb(s) + $H_2O$(l) = RbOH(aq) + $H_2$(g)

Accepted Answer

2 Rb(s) + 2 $H_2O$(l) = 2 RbOH(aq) + $H_2O$

Answer

2 Rb(s) + 2 $H_2O$(l) =  RbOH(aq) + $H_2O$

Answer

Equation is balanced

Answer

Rb(s) + 2 $H_2O$(l) = 2 RbOH(aq) + $H_2O$

Question 15

Balance the following equation with phases:  NiS(s) + $O_2$(g) = NiO(s) + $SO_2$(g)

Accepted Answer

2 NiS(s) + 3 $O_2$(g) = 2 NiO(s) + 2 $SO_2$(g)

Answer

2 NiS(s) + $O_2$(g) =2  NiO(s) + $SO_2$(g)

Answer

3 NiS(s) +2  $O_2$(g) = 3 NiO(s) + 3 $SO_2$(g)

Answer

3 NiS(s) + 2 $O_2$(g) = 3 NiO(s) + 2 $SO_2$(g)

Question 16

What is the numerical value of Avagadro's number?

Accepted Answer

6.022 X $10^{23}$

Answer

6.033 X $10^{32}$

Answer

6.022 X $10^{22}$

Answer

2.066 X $10^{23}$

Question 17

1 mole (mol) is equivalent to how many of anything?

Accepted Answer

6.022 X $10^{23}$

Answer

6.023 X $10^{22}$

Answer

6.022 X $10^{22}$

Question 18

A silver ring contains 1.1 X $10^{22}$ silver atoms.  How many moles of silver are in the ring?

Accepted Answer

1.8 X $10^{-2}$ mol Ag

Answer

1.8 X $10^{-3}$ mol Ag

Answer

1.7 X $10^{-3}$ mol Au

Answer

1.7 X $10^{-2}$ mol Au

Question 19

How many grams in 1.8 X $10^{-2}$ mol Ag.

Accepted Answer

1.9 g Ag

Answer

1.9 g Au

Answer

1.5 g Ag

Answer

2.9 g Ag

Question 20

How many aluminum atoms are in an aluminum can with a mass of 16.2g?

Accepted Answer

3.6 X $10^{23}$ Al atoms

Answer

3.6 X $10^{23}$ Au atoms

Answer

3.6 X $10^{23}$ Ag atoms

Answer

None of the above

Question 21

How many grams of Cl are in 38.0g of $CF_2Cl_2$?

Accepted Answer

22.3 g $CF_2Cl_2$

Answer

32.2g $CF_2Cl_2$

Answer

21.9 g $CF_2Cl_2$

Answer

20.3 g $CF_2Cl_2$

Question 22

How many grams of Cl are in 38.0 g of $CFCl_3$

Accepted Answer

21.6 g $CFCl_3$

Answer

61.2 g $CFCl_3$

Answer

16.2 g $CFCl_3$

Answer

26.1 g $CFCl_3$

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