1. Calculate the amount of heat required for 25.0 grams of water to change from 10 degrees Celsius to 30 degrees Celsius. *
2 points
2090
2 points
2.50.0 grams of water at 100 degrees Celsius evaporated to water vapor
at 100 degrees Celsius. Calculate the amount of heat required for this
conversion.
113000
3. A student measured 15.0 grams of ice in a beaker. The beaker was then 2 points
placed on a hot plate where it was heated uniformly for a certain amount
of time. During the melting process of the ice, the student noted that the
temperature was at 0 degree Celsius. When all the ice converted to water,
the final temperature was also at 0 degree Celsius. How much heat was
used to melt the ice? *
Your answer
4. If 5.0 grams of water was cooled from 50 degrees Celsius to 40
degrees Celsius, then calculate the amount of heat released by the water.
2 points
209
5. A certain amount of water used exactly 84.0 Joules of heat energy to
change from 25.0 degrees Celsius to 35 degrees Celsius. How many
grams of water was used?
2 points
No

1. 2090 J

2. 113,000J

3. 33,900J

4. -209.2 J

5. 2g

Explanation:

Note: specific heat capacity of water is 4.184 J/g°C.

1. The amount of heat can be calculated using the formula:

Q = m × c × ∆T

Q = 25 × 4.184 × (30 - 10)

Q = 104.6 × 20

Q = 2092 J

Q = 2090 J (nearest tens)

2. This question can be solved using the latent heat of vaporization of water. The latent heat of vaporization of a substance is the amount of heat required to convert a unit gram of a liquid into vapor without a change in temperature. The latent heat of vaporization of water per gram is:

2257 J/g

For 50grams of water, amount of heat that will be required will be: 50 × 2260

= 113,000J

3. For 15g of water, the amount of heat will be 15 × 2260 (latent heat of vaporization)

= 33,900J

4. Q = m × c × ∆T

Q = 5 × 4.184 × (40 - 50)

Q = 20.92 × (-10)

Q = -209.2 J

5. Q = m × c × ∆T

84 = m × 4.184 × (35 - 25)

84 = m × 4.184 × 10

84 = 41.84m

m = 84/41.84

m = 2.0076

m = 2g

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

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