Unit Test — Cumulative exam Answers

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For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?

A
reactants: 1; products: 1
B
reactants: 1; products: 2
C
reactants: 2; products: 1
D
reactants: 2; products: 2
22
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Atoms of two different elements must have different

A
electrical charges.
B
numbers of neutrons.
C
atomic numbers.
D
energy levels.
23

The equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O?

A
1
B
2
C
3
D
4

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