Martin slowly pours an unknown liquid into a container that originally had some water in it. He is measuring the temperature in the container as he does this. The temperature in the container rises very fast.

What kind of change is likely to be happening in the container?
A chemical change.

A physical change.

Both a chemical and a physical change.

Neither a chemical nor a physical change.

A chemical change.

Explanation:

As the temperature rises fast, the kind of change that can be said to be occurring is a chemical change.

One of the way to know of a chemical change is occurring is that new kinds of  matter is formed and also, there is either an evolution or absorption of heat energy in the process.

Since heat is liberated in this change, an exothermic chemical reaction is taking place.

So this is a chemical change.

- decrease the number of plants and animals living in the water.