Question 1

Balance this equation-
__P4 + __O2 --> __P2O3

Accepted Answer

1, 3, 2

Answer

3, 1, 2

Answer

1, 2, 3

Answer

2, 1, 3

Question 2

Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O

Accepted Answer

1,2,1,2

Answer

2,1,2,1

Answer

1,2,2,1

Answer

1,2,1,1

Question 3

Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2

Accepted Answer

1,2,1,2

Answer

2,2,2,2

Answer

2,1,2,1

Answer

1,2,2,1

Question 4

Balance this equation
_N2 + _H2 --> _NH3

Accepted Answer

2, 3, 1

Answer

2, 1, 3

Answer

1, 3, 2

Answer

1, 2, 3

Question 5

Balance this equation.
_Mg + _Cl2 --> _MgCl2

Accepted Answer

1,  1, 1

Answer

1, 2, 1

Answer

2, 1, 1

Answer

1, 1, 2

Question 6

Balance this equation.
_SnO2 +_H2-->_Sn +_H2O

Accepted Answer

1, 2, 1, 2

Answer

2, 1, 1, 2

Answer

2, 1, 2, 1

Answer

1, 2, 2, 1

Question 7

____Mg  +  ___ HCl  →   ____MgCl2  +   ____H2

Accepted Answer

1, 2, 1, 1

Answer

2, 2, 1, 1

Answer

1, 2, 2, 1

Answer

1, 1, 2, 1

Question 8

___PCl5  +  ___ H2O  →  ___ HCl  +  ____ H3PO4

Accepted Answer

1, 4, 5, 1

Answer

1, 4, 1, 5

Answer

1, 5, 4, 1

Answer

1, 1, 4, 5

Question 9

Which of the following is an unbalanced equation?

Accepted Answer

PbO﻿2 ﻿+ 2H﻿2﻿-->2Pb + H﻿2﻿O

Answer

2Na+ 2H﻿2﻿O-->2NaOH + H﻿2

Answer

CaCO﻿3 ﻿--> CaO + CO﻿2

Answer

CS﻿2 ﻿+ 2O﻿2 ﻿--> CO﻿2 ﻿+ 2SO﻿2

Question 10

What coefficient should be used to make the following equation balanced?
N﻿2﻿+O﻿2﻿--> ﻿____﻿NO

Accepted Answer

2

Answer

4

Answer

3

Answer

1

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