Question

read the text. chemists have various tests to learn about unknown substances. in a melting - point test, an unknown compound may be placed in a small tube. the tube is then attached to a thermometer. these pieces are suspended in a beaker of oil, which is slowly heated over a flame. the temperature at which the substance melts can be compared to that of known compounds, helping to identify the substance. simpler tests can be used to help identify unknown substances as well. for example, a flame test can be performed by dipping a clean platinum wire loop into an unknown substance and then holding the wire over a flame. the color that the flame turns can help you identify which metal element is present. another simple test is a ph test, which is conducted by dipping ph test strips into an unknown solution. the strip then changes color, showing the ph of the solution. which term matches the picture?

Explanation:

The image shows pH - test strips being used to test a solution. The strips change color to indicate the pH of the solution. The described test is a pH test.

Answer:

pH test