Achemist determined by measurements that 0.015 moles of iron participated in a chemical reaction. calculate the mass of iron that participated in the chemical reaction. round your answer to 2 significant digits.

0.84 g

Explanation:

Given: moles of iron = 0.015

Molar mass of iron = 56 g/mol

Thus 0.84 g of iron participated in the chemical reaction.

- "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)."

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.