CI2: Compounds and Elements

Is sugar (C₁₂H₂₂O₁₁) an element or a compound?

• Element
• Compound

Tags

NGSS.MS-PS1-1

Which of the following is not a compound?

• HCl
• Cl
• NaCl
• CO2

Tags

NGSS.MS-PS1-1

Which of the following represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

Tags

NGSS.MS-PS1-1

What cannot be broken down into other substances?

• Compound
• Mixture
• Solids
• Element

Which of the following is an example of a chemical element?

• sodium chloride (NaCl)

• water (H₂O)

• nitrogen (N)

• glucose (C₆H₁₂O₆)

Look carefully at the following chemical formulas:

CaCO₃ NaHCO₃ MgSO₄

How many different elements are shown in these three formulas?

• 3

• 7

• 10

• 17

Tags

NGSS.MS-PS1-1

Which container(s) hold a pure substance?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

Which container(s) hold a mixture?

• A

• B

• C

• D

Which container(s) hold an element?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

What is the difference between the substances represented by the symbols Co and CO?

• They are two different ways to represent the element cobalt.

• One is the symbol for an element, and one is a formula for a compound.

• Co represents the element cobalt, and CO represents the element copper

• They represent two substances, each made up of two elements

Tags

NGSS.MS-PS1-1