ML Chem Unit 10 Sell

1?

• gas

• liquid

• solid

• melting

• vaporizing

2?

• gas

• liquid

• solid

• melting

• vaporizing

3?

• gas

• liquid

• solid

• melting

• vaporizing

4?

• gas

• liquid

• solid

• melting

• vaporizing

5?

• gas

• liquid

• solid

• melting

• vaporizing

Which is true about boiling water?

• the water temperature will gradually increase

• the water temperature will remain the same

• the water will break down into hydrogen and oxygen gasses

Which is true about condensing water?

• the water releases energy

• the water absorbs energy

• the particles of hydrogen and oxygen combine to form H2O

If 20 kJ is produced in a combustion reaction of one mole of methane (CH₄), how many kJ of heat is produced when 4 moles of methane are combusted?

CH₄ + 2 O_{2 -->} CO₂ + H₂O ΔH = -20 kJ/mol

• -5 kJ

• -20 kJ

• -80 kJ

What is the reason that heat is transferred between two objects?

• difference in temperature

• specific heat capacity

• enthalpy difference

Which process happens when a chemical reaction absorbs heat?

• exothermic

• endothermic