Elements & Compounds (2)

Which of the following is not a compound?

• HCl

• Cl

• NaCl

• CO2

Which of the following represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

Salt water boils and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?

• Compound
• Element
• Mixture
• None of the Above

• 1
• 2
• 3
• 4

• 1
• 2
• 3
• 4

How many elements are represented in the compound?
Na₂CO₃

• 1
• 2
• 3
• 4

Au is the symbol for which element?

• Iron

• Titanium

• Gold

• Flourine

Fe is the symbol for which element?

• Gold

• Flourine

• Phosphorus

• Iron

What is the symbol for Calcium?

• Cl

• Ca

• Cm

• ca

How many elements are in HHe?

• 3

• 4

• 2

• 5