QUESTION 1 A beaker with fine ice is taken from a freezer and left on a laboratory table to melt.
The temperature is measured every 5 minutes for one hour. The temperature in the
laboratory is 20°C. The results are tabled below.
10
Time(min) o
Temp(°C) -10
5
-5
15
0
20
0
25
0
30
2
35
9
40
14
45
18
50
19
55
20
1.1 Use the information in the table and draw a line graph on the graph paper
provided.
(6)
1.2 What was the temperature in the freezer?
(2)
1.3 What happens to the ice between 15 and 20 minutes after it has been taken from
the freezer?
1.4 Why was the temperature in this time not changed?
(2)
1.5 Which property of ice causes it to float in water?
1.6 What, in the structure of water, makes the property in 1.5 possible?
(1)
1.7 In this property of ice (named in 1.5) did not exist, how would the marine life in
the cold arctic regions be influenced by it?
(2)​

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light