Chemistry Quiz

What happens in an exothermic process?

• System gains heat

• System cools down as the surroundings heat up

• System loses heat as the surroundings cool down

• System loses heat as the surroundings heat up

Is evaporating liquid water endothermic or exothermic?

• Exothermic
• Endothermic

How many Joules of heat are required to raise the temperature of 50g of water from 20 °C to 70 °C? (Specific heat of water = 4.184 J/g °C)

• 2 Joules

• 11000 Joules
• 12000 Joules
• 10460 Joules

Calculate the heat (in cal) to raise the temperature of 18g of water from 30 °C to 65 °C. (Specific heat of water = 1 cal/g °C)

• 450 cal
• 550 cal
• 720 cal
• 630 cal

How many Joules of heat does it take to melt 90g of iron at 20 °C? (Heat of fusion = 334 J/g)

• This is the answer click here

• 30,060

• 30,050 J

• 30,060 J

How many Joules of heat are required for 120 g of water to be vaporized at its boiling point? (Heat of vaporization = 2260 J/g)

• 50000 J/g

• 271200 J

• 271200 J/g

• 371200 J

What are the 5 factors affecting reaction rates?​​

• Temperature, Concentration, Pressure, Surface Area, and Catalyst

• Temperatures, Concentrations, Pressures, Surface Areas, and Catalysts

• Color of the reactants, Temperature, Concentration, Surface Area, and Catalyst

• Time, Reaction, Products, Speed, and Reactant

As concentration increases, reaction rates,

AB (g) + CB (g) ⟷ CD (g) + AD (g) If you add AD which side will the system shift to?

• The system will shift to the right

• The system will shift to the left

• The system will not shift to either side

• The system will shift to both sides

AD (g) + CD (g) + Heat ⟷ CB (g) + AB (g) If you remove heat which side will the system shift to?

• Equilibrium

• Neither

• The system will shift to the right

• The system will shift to the left