AnswersPhysical ScienceBalancing Chemical Equations

Balancing Chemical Equations — Quiz Answers

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Akia is balancing the equation Na plus cap h sub 2 cap o rightarrow NaOH plus cap h sub 2 He tries to find the coefficients that will balance the equation. How could he find the correct coefficients?

A
by counting the total atoms and making sure the number of atoms in the reactants is the same as the number of atoms in the products
B
by counting each individual atom and making sure the number of each kind of atom is the same in the reactants and the products
C
by counting the mass of each atom and making sure the reactants are more massive than the products
D
by counting the total mass of each compound and making sure the reactants have more mass than the products
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Which equation is balanced?

A
Mg sub 3 cap n sub 2 plus cap h sub 2 cap o rightarrow 3 MgO plus 2 NH sub 3
B
3 cap h sub 2 SO sub 4 plus 2 Fe rightarrow Fe sub 2 open paren SO sub 4 close paren sub 3 plus cap h sub 2
C
Zn plus 2 HCl rightarrow ZnCl sub 2 plus cap h sub 2
D
cap c sub 3 cap h sub 8 plus 5 cap o sub 2 rightarrow cap h sub 2 cap o plus 3 CO sub 2
3

Lana balanced an equation so that the result was 2 cap c sub 2 cap h sub 3 Br plus 5 cap o sub 2 rightarrow 4 CO sub 2 plus 2 cap h sub 2 cap o plus 2 HBr Which most likely represents the starting equation?

A
cap c sub 4 cap h sub 3 Br plus cap o sub 2 rightarrow CO sub 2 plus cap h sub 2 cap o plus HBr
B
cap c sub 2 cap h sub 3 Br plus 5 cap o sub 2 rightarrow 4 CO sub 2 plus cap h sub 2 cap o plus 2 HBr
C
cap c sub 2 cap h sub 3 Br plus cap o sub 2 rightarrow CO sub 2 plus cap h sub 2 cap o plus HBr
D
2 cap c sub 4 cap h sub 3 Br plus 5 cap o sub 2 rightarrow 4 CO sub 2 plus 2 cap h sub 2 cap o plus 2 HBr
4

The equations are not balanced. Which equation would have the same coefficients in the same order as 2 CO sub 2 plus 3 cap h sub 2 0 rightarrow cap c sub 2 cap h sub 6 cap o plus 3 cap o sub 2 ?

A
Fe plus cap h sub 2 SO sub 4 rightarrow Fe sub 2 open paren SO sub 4 close paren sub 3 plus cap h sub 2
B
FeCl sub 3 plus NH sub 4 OH rightarrow Fe OH sub 3 plus NH sub 4 Cl
C
CH sub 4 plus cap o sub 2 rightarrow CO sub 2 plus cap h sub 2 cap o
D
PCl sub 5 plus cap h sub 2 cap o rightarrow HCI plus cap h sub 3 PO sub 4
5

One half of a balanced chemical equation is shown. 3 Mg(OH) sub 2 plus 2 cap h sub 3 PO sub 4 Which lists the numbers of each atom the other half of the equation would contain?

A
Mg , 2 cap p , 14 cap o , 6 cap h
B
6 Mg , 6 cap p , 2 cap o , 12 cap h
C
3 Mg , 8 cap p , 7 cap o , 6 cap h
D
3 Mg , 2 cap p , 14 cap o , 12 cap h
6

Kiley wants to balance the equation cap h sub 2 plus cap n sub 2 rightarrow NH sub 3 Which would be her first step in balancing an equation?

A
creating a chart that shows the number of atoms in the reactants and products
B
adding the coefficient 3 in front of cap h sub 2 and the coefficient 2 in front of NH sub 3
C
multiplying the subscripts in the atoms of the reactants together
D
changing the subscripts so they match for the total number of atoms
7

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water open paren cap h sub 2 cap o close paren and cap o sub 2 gas. Which coefficients would be placed in front of water and oxygen?

A
2 in front of water and 1 in front of oxygen
B
1 in front of water and 1 in front of oxygen
C
1 in front of water and 2 in front of oxygen
D
2 in front of water and 2 in front of oxygen
9

Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group came up with a different answer. Which is the proper way to balance the equation Ca OH sub 2 plus cap h sub 3 PO sub 4 rightarrow Ca sub 3 open paren PO sub 4 close paren sub 2 plus cap h sub 2 cap o ?

A
Ca OH sub 2 plus 2 cap h sub 3 PO sub 4 rightarrow Ca sub 3 open paren PO sub 4 close paren sub 2 plus 6 cap h sub 2 cap o
B
3 Ca OH sub 2 plus 2 cap h sub 3 PO sub 4 rightarrow Ca sub 3 open paren PO sub 4 close paren sub 2 plus 6 cap h sub 2 cap o
C
3 Ca OH sub 2 plus 2 cap h sub 3 PO sub 4 rightarrow Ca sub 3 open paren PO sub 4 close paren sub 2 plus 3 cap h sub 2 cap o
D
Ca OH sub 2 plus cap h sub 3 PO sub 4 rightarrow Ca sub 3 open paren PO sub 4 close paren sub 2 plus 6 cap h sub 2 cap o
10

Which is the balanced equation for cap v sub 2 cap o sub 5 plus CaS rightarrow CaO plus cap v sub 2 cap s sub 5 ?

A
cap v sub 2 cap o sub 5 plus CaS rightarrow CaO plus cap v sub 2 cap s sub 5
B
cap v sub 2 cap o sub 5 plus 5 CaS rightarrow 5 CaO plus cap v sub 2 cap s sub 5
C
5 cap v sub 2 cap o sub 5 plus 5 CaS rightarrow 10 CaO plus 5 cap v sub 2 cap s sub 5
D
3 cap v sub 2 cap o sub 5 plus 3 CaS rightarrow 3 CaO plus 3 cap v sub 2 cap s sub 5

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