Question

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A group of students is investigating whether silver is a better thermal conductor than copper. The students take a silver wire and a copper wire of the same length and diameter. They put equal lengths of wax on one end of each wire and dip the other end into a beaker of hot water. The length of wax left on the wires after 10 minutes is shown.


Experimental Observations
Silver Copper
Original length of wax 3.5 cm 3.5 cm
Length of wax after 10 minutes 1.2 cm 2 cm


What was a control variable in this experiment?
a. Type of wire used
b. Original length of wax
c. final length of wax
d. Thermal conductivity of wire

Answer 1

Remember that a controlled variable is a variable that stays the same thoughout the experiment.

it wouldn't be a. because two different wires were used

the final length of the wax would be your dependent variable, so it wouldn't be c.

the thermal conductivity is the independent variable so it isn't d.

the original length of the wax was the same for both.

So B is your answer.

Answer 2

Answer:

Original length of wire used

Explanation:

I had this question on a quiz