Which is not an indicator of a chemical change? heat or light is produced. state of matter changes. a new substance is formed. a gas is formed.

The choice that is not an indicator of a chemical change is "State of matter changes". More common than not, chemical reactions produce energy in the form of light or heat. Along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid). Technically, a change in state is a physical change unless it also involves one of the other choices.

They can measure  the amount of energy gained or lost

So what you would do is go through and add 3 teaspoons(tsp) 6 times because of the 6 tablespoons(tbsp). which will give you an answer of 18. another way is to multiply 3x6=18.