Balancing Chemical Equations

Question 1

Which is the balanced equation for V2O5 + CaS → CaO + V2S5?

Revolt · Accepted Answer

V2O5 + 5CaS → 5CaO + V2S5

Question 2

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which coefficients would be placed in front of water and oxygen?

Revolt · Accepted Answer

2 in front of water and 1 in front of oxygen

Question 3

One half of a balanced chemical equation is shown.3Mg(OH)2 + 2H3PO4Which lists the numbers of each atom the other half of the equation would contain?

Revolt · Accepted Answer

3 Mg, 2 P, 14 O, 12 H

Question 4

If the mass of the products measured 120 g, what would be the mass of the reactants?

Revolt · Accepted Answer

120 g

Question 5

Substances A and B react in a ratio of A + B → AB. Colin was combining substance A and substance B to form substance AB. He added 10 g of substance A and 45 g of substance B.

Revolt · Accepted Answer

55 g

Question 6

Which equation is balanced?

Revolt · Accepted Answer

Zn + 2HCl ZnCl2 + H2

Question 7

The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 C2H6O + 3O2?

Revolt · Accepted Answer

Fe + H2SO4 Fe2(SO4)3 + H2

Question 8

Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction?

Revolt · Accepted Answer

The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.

Question 9

Lana balanced an equation so that the result was 2C2H3Br + 5O2 → 4CO2 + 2H2O + 2HBr. Which most likely represents the starting equation?

Revolt · Accepted Answer

C2H3Br + O2 → CO2 + H2O + HBr

Balancing Chemical Equations Answers

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