Video Transcript
Fill in the blank. The temperature at which matter
changes from the solid state to the liquid state is known as its blank point. (A) Critical, (B) melting, (C)
boiling, (D) drying, (E) freezing.
Matter can exist as a solid, a
liquid, or a gas. The state of matter can be changed
by adding or removing energy, which we can think of as increasing or decreasing the
temperature. To discuss these changes, let’s
consider water in its solid, liquid, and gaseous form.
When solid ice is at a temperature
of zero degrees Celsius, the ice will begin to undergo the process of melting and
will turn into liquid water. The temperature at which matter
begins to change from the solid state to the liquid state is known as its melting
point. When the temperature of liquid
water is 100 degrees Celsius, the water will begin to boil and turn into water
vapor, water in its gas state. The temperature at which matter
begins to change from the liquid state to the gas state is known as its boiling
point.
The question has to do with the
temperature at which matter changes from the solid state to the liquid state. We know that the temperature at
which this change occurs is called the melting point. So we should fill in the blank with
the word “melting,” answer choice (B), so that the statement reads “The temperature
at which matter changes from the solid state to the liquid state is known as its
melting point.”
