Thermal Properties of Water

Anna explains how to find the initial temperature of water given its final temperature and energy used. The process involves converting kilojoules to joules, milliliters to grams, and applying the heat equation. By calculating delta T and using it to find the initial temperature, Anna demonstrates the solution step-by-step.

What is the final temperature of water given in the problem?

• 59.6 degrees Celsius

• 18.7 degrees Celsius

• 20.5 degrees Celsius

• 49.2 degrees Celsius

How many joules are equivalent to 18.7 kilojoules?

• 1870 joules

• 187000 joules

• 1870000 joules

• 18700 joules

What is the mass of water in grams when converted from 420.5 milliliters?

• 4205 grams

• 4.205 grams

• 42.05 grams

• 420.5 grams

Which equation is used to calculate the initial temperature of water?

• mass = heat / (specific heat * delta T)

• specific heat = heat / (mass * delta T)

• heat = mass * specific heat * delta T

• delta T = mass * specific heat / heat

What is the specific heat of water used in the calculation?

• 4.184 joules/gram degrees Celsius

• 2.184 joules/gram degrees Celsius

• 3.184 joules/gram degrees Celsius

• 5.184 joules/gram degrees Celsius

What is the calculated value of delta T in the problem?

• 17.59 degrees Celsius

• 10.6 degrees Celsius

• 18.7 degrees Celsius

• 49.2 degrees Celsius

Why is the unit 'grams' canceled out in the calculation?

• Because it is not needed

• Because it is divided by itself

• Because it is multiplied by zero

• Because it is added to joules

What is the formula for delta T in this context?

• Initial temperature + final temperature

• Final temperature - initial temperature

• Final temperature + initial temperature

• Initial temperature - final temperature

What is the final calculated initial temperature of the water?

• 10.6 degrees Celsius

• 20.5 degrees Celsius

• 59.6 degrees Celsius

• 49.2 degrees Celsius

What is the significance of significant figures in the final answer?

• They ensure precision

• They are used to round off to the nearest whole number

• They make the answer look better

• They are not important