Chemistry Beginner

How many significant figures are present in 0.0025

• Two

• Three

• Four

• Five

How many atoms of magnesium are present in 96u of Magnesium

• 0.25

• 25

• 4

• 0.4

The volume of 1.7g of NH3 at STP (273K, 1atm) is

• 1.7L

• 2.24L

• 2.8L

• 3.4L

Number of moles present in 22.0g of carbondioxide is

• 2

• 22

• 0.5

• 0.25

If the density of a solution is 4.5g/mL, the mass of 1.4mL solution in significant figure is

• 3.21g

• 4.5g

• 0.63g

• 6.3g

The reactant which is entirely consumed when a reaction goes to completion is called

Which is more informative?

• Empirical Formula

• Molecular Formula

Mass percent of phosphorus in calcium phosphate is

• 38.71%

• 20%

• 41.29%

• 28%

................ refers to the agreement of a particular value to the true value of the result.

Tags

NGSS.HS-PS1-7

NGSS.HS-PS2-1

Law of definite proportions states that equal volumes of all gases under similar conditions of pressure and temperature contain equal number of molecules.

• True

• False