Unit 6 Quiz 1 Review

What is the mole used for? 

• To measure the amount of grams in a substance
• To measure the amount of atoms or molecules in a substance
• To measure the amount of energy in a substance
• To measure the amount of bonding in a substance 

What is Avogadro's Number? 

• 6.02 x 10²³
• - 6.02 10²³
• 6.02 x 10²²
• 6,020,000,000,000

How many atoms are in 1 mole of NaCl? 

• 6.02 x 10²³
• 58 
• 11
• 17

How are the mole and atomic masses of elements related?  

• The atomic mass of any substance is always equal to 1 mole of that substance 
• The atomic mass added up with itself by 6.02 x 10²³ equals the amount of atoms
• The atomic mass is the amount of protons plus number of atoms
• Atoms combined make up molecules, which are the measurement of atomic masses 

Which of the following statements regarding the mole is INCORRECT?

• A mole is a unit of quantity equal to 6.02 x 10²³ particles.

• The number of particles in a mole is known as Avogadro’s number.

• A mole of particles of an element is numerically equal to the atomic mass of the element.

• none of the above

Which has more molecules?

• 1 mole H₂O
• 1 mole Al(OH)₃
• 1 mole NaCl
• There are all the same

Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C₆H₁₂O₆? 

• 1 mole = 78.12 g
• 1 mole = 22.4 L 
• 1 mol = 6.02x 10²³ particles 
• more than one

How many molecules are in 2.5 mol of NaCl?

• 1.51x10²³

• 146

• 4.15

• 1.51x10²⁴

In order to convert from grams of a substance to moles of a substance, I would need to ___________.

• divide by the molar mass

• divide by the molecular mass

• divide by the molecular weight

• divide by the mass of one mole

What is the molar mass of Calcium Oxide (CaO)?

• 56.1

• 112.2

• 24.0

• 40.1