Avogadro's Number

Avogadro's Number

Multiple Choice

How do the following two elements bond together?
K¹⁺  S^2- 

• KS
• K₈S
• K₆S₃
• K₂S

Multiple Choice

Which of the following is NOT an ionic compound:

• CaO
• NaOH
• BaCl₂
• Br₂

Multiple Choice

Metals tend to 

• gain electrons
• lose electrons

Open Ended

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Avogadro's Number

Essential Questions

1. Why do we count atomic particles in Chemistry?

2. How can quantifying atoms help us understand chemical reactions?

Multiple Choice

How many dozen eggs are in a container of 6 eggs?

• 4

• 0.5

• 1

• 2

• I need help

Multiple Choice

How many dozen eggs are in a container of 18 eggs?

• 1.5

• 3

• 0.67

• 2

• I need help

Multiple Choice

Let's try a mole example:

Given 6.02 x 10²³ atoms/particles are in a mole, how many particles of sand are in 0.5 moles of sand?

• 1.5 x 10²³

• 3.01 x 10²³

• 6.02 x 10²³

• 1.2 x 10²⁴

• I need help

Multiple Choice

Let's try another example:

Given 6.02 x 10²³ atoms/particles are in a mole, How many pieces of gold dust are in 2 moles of gold dust?

• 1.5 x 10²³

• 3.01 x 10²³

• 6.02 x 10²³

• 1.2 x 10²⁴

• I need help

Multiple Choice

Let's try another example:

Given 6.02 x 10²³ parts are in a mole, how many moles of stars are in a galaxy that have 400 billion (4 x 10¹⁴) stars?

• 1.5 x 109

• 6.7 x 10^-10

• 10

• 0.5

• I need help

Multiple Choice

How many atoms of titanium are in a sample containing 0.5 moles of titanium?

• 1.5 x 10²³

• 3.01 x 10²³

• 6.02 x 10²³

• 1.2 x 10²⁴

• I need help

Multiple Choice

How many atoms of sodium are in a sample containing 2.0 moles of sodium?

• 1.5 x 10²³

• 3.01 x 10²³

• 6.02 x 10²³

• 1.2 x 10²⁴

• I need help

Multiple Choice

How many moles of potassium are in a sample containing 3.01 x 10²³ atoms of potassium?

• 1.0

• 2.0

• 0.5

• 0.75

• I need help

Multiple Choice

Formula units refer to particles of _______ compounds and molecules refer to particles of ________ compounds.

• molecular/covalent, ionic

• Ionic, molecular/covalent

• atoms, molecular

• atoms, ionic

• I need help

Multiple Choice

How many molecules are there in 2.10 moles of CO₂?

• 3.79 x 10²⁴

• 3.49 x 10^-24

• 1.05 x 10^-23

• 1.26 x 10²⁴

Multiple Choice

How many atoms of sodium are in 15 moles of NaCl?

• 7.5

• 15

• 30

• 45

• I need help

Multiple Choice

How many formula units are there in 2.45 moles potassium chloride?

• 4.07 x 10^-24 
• 1.47 x 10²⁴ 
• 1.47
• 4.07

Multiple Choice

What is the difference between a formula unit and a molecule?

• formula unit - ionic compound

  molecule - covalent/molecular compound

• formula unit - big

  molecule - small

• formula unit - covalent/molecular compound

  molecule - ionic compound

• formula unit - small

  molecule - big