Question

Your teacher burns a piece of steel wool in class, demonstrating the chemical property, flammability. You are curious to see what other things can demonstrate chemical properties. Which of these does not demonstrate a chemical change? A) Burning sugar demonstrates a chemical change. B) The rusting of steel wool demonstrates a chemical change. C) Making soap by allowing fat to react with sodium hydroxide demonstrates a chemical change. D) Measuring the freezing point of different concentrations of salt water demonstrates a chemical change.

Answer 1

I believe the answer would be D.

Step-by-step explanation:

Because you can reverse it by thawing the ice.

Also, for future reference, this isn't a geography question.

Answer 2

The option that doesn´t demonstrate a chemical change is letter "D".

Measuring the freezing point of different salt water concentrations is an example of physical change since when the water temperature drops to zero degrees Celsius, it freezes. That is, it passes from the liquid state to the solid state, but it is still water.

Step-by-step explanation:

It is important to take into account the difference between physical changes and chemical changes since matter is constantly transformed.

• Physical changes describe changes when matter does not change in structure, or composition; just change its size, shape, position or aggregation status.

• Chemical changes are those when matter changes in its composition and properties. In this type of changes the initial substances are transformed.

.