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

Responses

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

conduct a test to determine the chemical makeup of the molecules
conduct a test to determine the chemical makeup of the molecules

observe a color change
observe a color change

test for the release of heat

Answer 1

All of the provided options can indicate that a chemical change has occurred, but some are more direct indicators than others.

1. Monitor for the release of a gas - This is a common indicator of a chemical change, especially if gas was not present before the substances came into contact.

2. Conduct a test to determine the chemical makeup of the molecules - This is a more complex method and would require specialized equipment; it doesn't provide immediate evidence of a change.

3. Observe a color change - A color change can be a clear indicator of a chemical change, as it often signifies the formation of new substances.

4. Test for the release of heat - This can also indicate a chemical change, particularly in exothermic reactions.

Among these options, the most reliable and immediate signs of a chemical change would be monitoring for the release of a gas and observing a color change. However, since you're looking for one response, observe a color change is often a straightforward and reliable observation of a chemical change.

Answer 2

so whats the answer

Answer 3

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