Kyle is gradually raising the temperature of a substance. He finds that it starts to melt at 113°C and has completely melted at 118°C. Is this a mixture or a pure substance?

Read the description below of a substance and an experiment on it. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture, if you can.The sample is 100.mL of a clear liquid. The density of the liquid is measured, and turns out to be 0.77/gmL. The liquid is then cooled in the refrigerator. At 10.0°C crystals begin to appear. The temperature of the liquid continues to decrease as more crystals form, until at 6.2°C the liquid is entirely solid.Is the sample made from a pure substance or a mixture?If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide."pure substancemixture(can't decide)

Which of the following is TRUE about a pure substance?a.It is always a solid or gas.b.It can be an element.c.It does not have a fixed boiling point.d.It is also called "homogeneous mixture".

What do you mean by a pure substance?

Changes of state—between solid, liquid, and gas—arephysical changes, meaning no chemical changes are takingplace. These changes are related to temperature (andpressure) and are reversible. A pure substance, containingonly one element or compound, is a solid below its meltingpoint, a liquid at temperatures between its melting andboiling point, and a gas above its boiling point.

Melt:Liquid :: Freeze:?