Wednesday and Thursday Review Combined

How close a measurement is to the accepted value is called..

• Accuracy

• Precision

• Significant

• Estimate

What is used to represent the number of particles in a substance?

• mole

• gram

• kelvin

• atmosphere

Avogadro’s number is:

• 6.02 x 10²²

• 6

• 6.02 x 10²³

• 3.01 x 10²³

The law of conservation of mass states that

• the mass of the products is greater than the mass of reactants

• the mass of the products = the mass of the reactants

• the reactants are less than the products

How many significant digits are in 11?

• 2

• 1

• 11

How many significant digits are in 100?

• 2

• 1

• 100

What is volume at Standard Temperature and Pressure(STP) in a gas?

• 22.4 liters/1mole

• 10 liters/1mole

• 1 liter/1mole

1 mole of gas at STP, takes up how much volume?

• 22.4 liters

• 1 liter

• 1 mole

• 10 liters

What is the volume in liters of 3 moles of CO₂ gas at STP?

NOTE THE GAS DOES NOT MATTER, COULD BE CO₂ ARE IN GAS!

• 67.2

• 22.4

• 44.8

What is the percent composition of chromium in BaCrO₄?

step 1: Figure molar mass of BaCrO_4, Step 2: molar mass of Cr divide by molar mass of BaCrO₄ Step 3: x 100 to get percentage

• 20.5%

• 25.2%

• 54.5%

• 25%