Day 3 (Jan 6) Notes

Question 1

Heat is…

Answer 1

a form of energy in an object. Heat cannot be measured. Only changes in heat can be measured. In other words, we can only measure how much energy an object gains of loses.

Question 2

What has more heat a cup of boiling water or an iceberg?

Answer 2

The iceberg bc there are many more molecules. When the heat of each molecule is added the sum is much greater than that for the boiling water.

Question 3

Specific Heat Capacity (Continued)

Answer 3

The higher the specific heat capacity the more energy it takes to increase the temp of the substance

Question 4

Which will heat up faster gold or lead?

Answer 4

They will increase at the same rate be they have the same
“c” value

Question 5

Why is B.C. warmer in the winter than Sask?

Answer 5

The Ocean. The temp of the ocean remains relative constant through out the year. water has a high specific heat capacity (the energy required to increase the temperature of 1 kg of a substance by 1 degree celcius), Water can absorb an enormous amount of energy before it changes temp. The slower a material warms the slower it will cool as well.

Question 6

which way does the breeze go on a calm day: lake to shore or Shore to lake?

Answer 6

The breeze flows from the water onto the shore

         wind
       ——>            hot air 
       ——>            ^ ^ ^
                             | | | ~~~~~~~~~~~~//———————

Question 7

What happens at night?

Question 8

Latent Heat of Fusion (melting or freezing)

Answer 8

The amount of energy required to change 1 kg of a substance from a solid to a liquid without changing its temperature is known as latent heat of fusion.
Q= ml
f

Question 9

Why is ice used to keep pop in a cooler cool?

Answer 9

Ice has a high latent heat of fusion. As a result, it absorbs a large amount of energy without changing temp.

Question 10

Latent Heat of Vaporization (boiling, vapor zing or concencing)

Answer 10

the amount of thergy required to change likg of a substance from. a liquid to a gas without changing its
temperature is known as latent heat of vaporization (l
v)

Q= ml
v

Question 11

Which burns more: steam at 100°C or water an 100°C? Explain

Answer 11

Steam as it releases energy when it condenses and then the boiling water also releases energy into your skin as well.

Question 12

Calculating Heat Transferred

Answer 12

How do we measure heat? we cannot measure heat, but we can measure how much heat is gained or lost by an object.

Question 13

We can also use a process known as ________ to…

Answer 13

Calorimetry. …calculate changes in energy and the specific heat capacity of an object.
Essentially the process uses the idea that the heat lost by one object is equal the hear gained by another object.

Question 14

Kinetic Molecular Theory

Answer 14

• Molecules are in constant motion
• Molecules move fastest in gases and slowest in solids
  -Collisions between moving molecules transfer energy between them

Question 15

Linear Expansion. Why are there spaces between inter locking patio bricks?

Answer 15

These spaces are known as expansion seams. They allow for the expansion and contradiction of the materials as the temp changes.
ex. train tracks, bridges, telephone poles

Question 16

Most substances expand when heated and contract when cooled, How would this be explained using the KMT?

Answer 16

All dimensions of a solid increase when heated. The expansion is minimal except in the length. An increase in length in one direction
is called linear expansion (Δ L)

Question 17

The Linear expansion of a solid depends on 3 factors:

Answer 17

I. Initial length (L).
2. Temperature change (Δ T.)
3. Type of material (α)- the change in length of a solid per unit length per unit change in temp is know as the coefficient of linear expansion

Question 18

Δ L = α LΔT