Answer:
Acids or bases can be tested by chemical indicators.
Explanation:
A chemical indicator can be described as a paper substance which changes colour when dipped in an acidic or basic solution. It can be described as a chemical indicator for hydrogen ions (H+) and hydronium ions (H3O+).
Acidic solutions normally dive red-orange colours depending on the acidicity of the substance. The basic solutions give blue-violets colours depending on the basicity of the substance.
Answer:
By designing an experiment where the temperature on the thermometer is measured after a chosen (same) time interval when the thermometer is wrapped with the different materials and placed in the freezer
Explanation:
Experimental design
Materials given: freezer, a thermometer, samples of materials
setup:
1. The freezer is put on and made to remain at a particular temperature, mimicking the winter season.
2. Next, different materials for the coat design with equal dimensions are used to rap the thermometer whose initial temperature has been recorded in the same pattern and the thermometer is placed in the freezer and left for a certain time, which is made constant for the different materials.
3. after the time, the final temperature on the thermometer is recorded.
Result interpretation
The temperature is expected to drop after the time in the freezer, but the material with the smaller change (drop) in temperature indicates that it traps more heat hence is the best material for designing a winter coat
independent variables: type of material used
dependent variables: temperature on the thermometer
control variables: time, dimensions of materials, temperature of freezer, pattern of wrapping.
It’s under chemical change.
The answer is A) Drinking water.
Edit: Thank you for Brainliest!!
