Unit 5 - Counting Review

Which of the following is not true about one mole?

• one mole contains 6.02 x 10²³ particle

• 12 g of carbon equals one mole of carbon atoms

• the mass of 1 mole of carbon atoms = the mass of 1 mole of boron atoms

• the number of atoms in 1 mole carbon = the number of atoms in 1 mole of boron

What mass of calcium metal contains the same number of atoms as 24.3 g of magnesium?

• 40.1 g

• 21.0 g

• 80.2 g

• none of these

Tags

NGSS.HS-PS1-7

“Empirical” means

• theoretical

• hypothetical

• based on data

• acquired by armed conflict

Tags

NGSS.HS-ESS3-5

NGSS.HS-LS2-6

NGSS.HS-LS4-1

NGSS.HS-PS1-2

The molar mass of Na2CO3 is

• 51.0 g/mol

• 83.0 g/mol

• 96.0 g/mol

• 106.0 g/mol

In a reaction between zinc and chlorine to produce zinc chloride, if eight pieces of zinc were used rather than four, the ratio of zinc to chloride in the compound

• would be half as much

• would remain the same

• would change by an unknown amount

• would be doubled

Tags

NGSS.HS-PS1-7

The number oxygen atoms represented by the formula Pb(C2O4)2  is

• 2

• 4

• 6

• 8

The number atoms of all kinds represented by the formula (NH₄)₂SO₄ is

• 4
• 10
• 12
• 15

Tags

NGSS.MS-PS1-1

Calculate the relative mass of a dime as compared to the lightest.

• 1
• 2.18
• 1.09
• 2.46

Calculate the relative mass of a nickel as compared to the lightest.

• 1
• 2.18
• 1.09
• 2.46

Calculate the relative mass of a quarter as compared to the lightest.

• 1
• 2.18
• 1.09
• 2.46