Addition and Subtraction Facts

What is the result of adding the atomic numbers of Hydrogen and Helium?

• 3

• 4

• 5

• 6

If you subtract the number of protons in Carbon from the number of protons in Oxygen, what is the result?

• 2

• 4

• 6

• 8

In a chemical reaction, if you add the coefficients of the reactants in the equation @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@, what is the sum?

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-5

Subtract the number of neutrons in Deuterium from Tritium. What is the result?

• 0

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

If you add the atomic masses of Hydrogen (1) and Oxygen (16), what is the result?

• 15

• 16

• 17

• 18

Tags

NGSS.MS-PS1-1

What is the result of subtracting the atomic number of Helium from Neon?

• 6

• 7

• 8

• 9

In a molecule of water, if you add the number of hydrogen atoms to the number of oxygen atoms, what is the total?

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

Subtract the number of electrons in a neutral atom of Lithium from a neutral atom of Fluorine. What is the result?

• 4

• 5

• 6

• 7

If you add the number of valence electrons in Sodium and Chlorine, what is the result?

• 6

• 7

• 8

• 9

Subtract the number of valence electrons in Oxygen from the number of valence electrons in Neon. What is the result?

• 0

• 1

• 2

• 3