Second quiz for grade 7

What's the name of the temperature at which a liquid boils?

• Melting point

• Boiling point

• Condensation point

• Evaporation point

What happens to the particles during melting?

• Their amount of energy the have does not change

• They receive more energy

• They receive less energy

• All of the above

One of the following is a hydrocarbon

• Methane

• Water

• Glucose

• Ammonia

One of the following has strongest force of attraction

• Solid

• Liquid

• Gas

• Plasma

At what temperature does water boil?

• 50

• 200

• 150

• 100

What is the formula of carbon dioxide?

• C2O

• CO2

• CO

• CO3

Which of the following involves breaking down of large petroleum fractions

• Melting

• Cracking

• Treatment

• Condensation

Which of these gases is the chief constituent of air?

• Oxygen

• Nitrogen

• Water vapour

• Helium

Which of the following is positively charged?

• Proton

• Electron

• Carbon

• Neutron

Solids cannot vibrate

• True

• False

• None of the above

• All of the above