Chem part 1

Which of the following is equal to the boiling point of a substance?

• the temperature where it changes from a solid to a liquid
• the temperature where it changes from a gas to a liquid
• the temperature where it changes from a liquid to a gas
• 100⁰C for each substance

Which of the following is true for the melting point of a substance?

• it is equal to the boiling point
• it is equal to the freezing point
• it is equal to 0⁰C
• it is the temperature at which a liquid becomes a solid

Which of the following is a characteristic physical property, not just an observation of a substance?

• colour
• brittleness
• density
• temperature

Which of the following is a pure substance?

• water
• pizza
• vinegar
• saline

Which of the following is a pure substance?

• wood
• silver
• paper
• oranges

Which of the following is an element?

• methane (CH₄₎
• water (H₂O)
• acetic acid (CH₃COOH)
• bromine gas (Br₂)

Which is false concerning metals, non-metals and metalloids?

• most metals conduct electricity
• most metals are located to the LEFT of the step ladder
• metalloids have properties of metals and nonmetals
• non-metals are located to the LEFT of the step ladder

Which of the following is a homogeneous mixture?

• pure water
• saline
• granola
• fresh grapefruit juice

Which of the following is NOT a metal?

• calcium
• iron
• silicon
• zinc

Which of the following is a non-metal?

• calcium
• silicon
• sulfur
• copper