DN_ELEMENTS & COMPOUNDS

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

What cannot be broken down into other substances?

• Compound
• Mixture
• Solids
• Element

Which of the following is

an element?

• Carbonic Acid
• Copper
• Iron and Copper
• Water

How many elements are represented in the compound?
Na₂CO₃

• 1
• 2
• 3
• 4

When the nails were left outside and allowed to rust during the substance detector activity, what new substance was created?

• Mud
• Rust
• Grass
• Water

Is water an element or a compound?

• Element
• Compound

Au is the symbol of which element?

• Iron
• Titanium
• Gold
• Flourine

Element:Fe

• Gold
• Flourine
• Phosphorus
• Iron