A teacher wants to perform demonstration that illustrates both chemical and physical changes. Which would be the best demonstration that she could use? A) bending a piece of aluminum B) breaking a matchstick C) dissolving sugar in water D) burning a candle

c option is your answer

Explanation:

please mark me as brainliest

D) burning a candle

A demonstration that contains both physical and chemical changes will be BURNING OF A CANDLE.

This is because when a candle is lighted up, on the top of it (where we see flame) the oxygen and other gases present around will be chemically changed (burned up)

When the wax in the top of the candle will get melted due to the heat of the fire a physical change takes places.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.