Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?(1 point)

Question

Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?(1 point)

Responses

test for the release of heat
test for the release of heat

monitor for the release of a gas
monitor for the release of a gas

observe a color change
observe a color change

conduct a test to determine the chemical makeup of the molecules

which one

Answer 1

The correct answer is:

observe a color change

Answer 2

The reliable way to observe that a chemical change has occurred when two substances come in contact with one another is to observe a color change.

Answer 3

Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?(1 point)

The correct answer is:

The reliable way to observe that a chemical change has occurred when two substances come in contact with one another is to observe a color change.

The reliable way to observe that a chemical change has occurred when two substances come in contact with each other is to observe a color change.