Use the following information to answer questions 16–18.
A substance is a solid at 15°C. A student
heated a sample of the solid substance and
recorded the temperature at one-minute
intervals in the data table below.
0
1
2.
3
4
5
6
Time (min)
Temp (°C)
15
32
46
53
53
53
53
7
8
9
10
11
12
13
Time (min)
Temp (°C)
53
53
53
53
60
65
70
16. Based on the data table, what is the
melting point of this substance?
17. What is the evidence that the average
kinetic energy of the particles of this
substance is increasing during the first
three minutes?
18. The heat of fusion for this substance is
122 joules per gram. How many joules
of heat are needed to melt 7.50 grams of
this substance at its melting point?

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .