Elements, compounds and mixtures

What are elements?

Is H₂ an element or a compound?

• Compound

• Element

What are compounds?

Is CO₂ an element or a compound?

• Compound

• Element

Which elements are present in H₂O

Which of the following substances is considered a compound?

• O₃

• Cl₂

• NO₂

• N₂

How many different elements are in an amino acid with the formula C₅H₁₁NO₂S

• 3

• 2

• 6

• 5

Which of the molecules shown above would be classified as elements?

• molecules 1 and 6

• molecules 2 and 3

• molecules 6 and 5

• molecules 4 and 6

how many atoms of Carbon are in the formula C₆H₁₂O₆

• 5

• 6

• 12

Mass number is equal to proton number

• True

• False