Describing Chemical Reactions

Question 1

What is the number “4” in SiCl4?

Revolt · Accepted Answer

a subscript

Question 2

Examine the chemical reaction.

Revolt · Accepted Answer

5

Question 3

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 4

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 5

For the equation 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O, how many units of NO3 are represented on the products side?

Revolt · Accepted Answer

6

Question 6

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

Revolt · Accepted Answer

12

Question 7

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

Revolt · Accepted Answer

7

Question 8

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 9

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 10

Which equation best represents the law of conservation of mass?

Revolt · Accepted Answer

mass of reactants = mass of products

Describing Chemical Reactions Answers