Describing Chemical Reactions

Question 1

The expression CaCO3 → CaO + CO2 is an example of a

Revolt · Accepted Answer

chemical equation.

Question 2

Rust results from iron’s reaction to oxygen. An iron nail gains mass when it rusts. How does this reaction support the law of conservation of mass?

Revolt · Accepted Answer

The mass of the rusted nail equals the mass of iron and the oxygen from the air it reacted with to form the rust.

Question 3

Which is the correctly balanced equation for the reaction of rust, Fe2O3, and hydrochloric acid, HCl?

Revolt · Accepted Answer

Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O

Question 4

The product side of a chemical reaction is shown.→ 7Ti2(SO4)3

Revolt · Accepted Answer

7

Question 5

In the product 6O2, what does the coefficient mean?

Revolt · Accepted Answer

There are 6 molecules of O2.

Question 6

Leslie incorrectly balances an equation as 2C4H10 + 12O2 → 8CO2 + 10H2O.

Revolt · Accepted Answer

12

Question 7

What can the arrow in a chemical reaction be translated to mean? Check all that apply.yieldsaccompanied byreact to formadded toexcept

Revolt · Accepted Answer

yields; react to form

Question 8

Examine the chemical reaction.

Revolt · Accepted Answer

5

Question 9

Cecil writes the equation for the reaction of hydrogen and oxygen below.H2 + O2 → H2O

Revolt · Accepted Answer

to show that atoms are conserved in chemical reactions

Question 10

Which equation best represents the law of conservation of mass?

Revolt · Accepted Answer

mass of reactants = mass of products

Describing Chemical Reactions Answers