Evidence of Chemical Reactions

Question 1

Use the periodic table to select the chemical symbol for each element.The symbol for carbon is

Revolt · Accepted Answer

C.

Question 2

The symbol for hydrogen is

Revolt · Accepted Answer

H.

Question 3

The symbol for nitrogen is

Revolt · Accepted Answer

N.

Question 4

The symbol for iron is

Revolt · Accepted Answer

Fe.

Question 5

The symbol for copper is

Revolt · Accepted Answer

Cu.

Question 6

Select the description of each substance given by each chemical formula. One molecule of O2 is made of

Revolt · Accepted Answer

two atoms of oxygen.

Question 7

The compound Al2O3 is made of

Revolt · Accepted Answer

two atoms of aluminum to three atoms of oxygen.

Question 8

The compound KOH is called

Revolt · Accepted Answer

potassium hydroxide.

Question 9

Which of the following happens during a chemical change? Check all of the boxes that apply.

Revolt · Accepted Answer

New substances with different properties are formed.; Solids, liquids, or gases may form.

Evidence of Chemical Reactions Answers