EXAMEN DE QUIMICA

What is the first element on the Periodic table?

• He

• H

• Li

• Be

What is the Chemical Symbol of Gold?

• G

• Go

• Au

• Ag

What is the Chemical Symbol of Iron?

• I

• Ir

• P

• Fe

What is the Chemical formula of Rock Salt?

• Na2Cl

• NaCl2

• NaCl

• Na2Cl3

What is the Chemical name of salt?

• Sodium chlorine

• Sodium Hydroxide

• Sodium chloride

• Sodium salt

What is the Chemical formula of water?

• 2H2O

• HO2

• H2O

• HO

What is the percentage of Carbon dioxide in the air?

• 1%

• 21%

• 0.04%

• 4%

How much oxygen in 100 grams of water?

• 66g

• 89g

• 50g

• 75g

What is the atomic number of Carbon?

• 12

• 10

• 6

• 8

What is the percentage of oxygen in the air?

• 78%

• 21%

• 4%

• 35%