Question

question 1 - 10
pauline is curious to know if salt affects the freezing rate of water. to test her question, she labeled three identical containers #1, #2 and #3, next she filled each container with equal amounts of distilled water. she did not add any salt into container #1. she did dissolve 5g of salt into container #2 and 10g of salt into container #3. pauline placed all containers into a freezer and measured the temperature at which the water froze in each container. her data is shown below.
data table 1: temperature reading for freezing point

how would you identify the test variable (independent variable)?

Explanation:

Step1: Understand the experiment

Pauline is testing if salt affects the freezing rate of water. She has three containers with different amounts of salt.

Step2: Recall the definition of independent variable

The independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.

Step3: Identify the changed variable

In this experiment, the amount of salt added to each container is what Pauline is changing (0g, 5g, 10g).

Answer:

The independent variable (test variable) is the amount of salt added.