Answer:
The correct answer is B it"s a proven fact.
Explanation:
Any scientific theory is based upon many experiments ans observations.The experiment and observations are repeated many times to provide a scientific logic about that theory.
A scientific theory is accepted only when that theory is logically proved by various experiment ,observations,statistical analysis etc.
Answer:
a. endothermic
Explanation:
- Endothermic reaction: is a chemical reaction that absorbs heat or energy through the reaction.
- While, exothermic reaction: is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction.
<em>So, Any reaction that absorbs 150 kcal of energy can be classified as </em><em>a. endothermic.</em>
Temporary hardness can be dealt with using boiling water(Calcium hydrogen carbonate) but Permanent won't so you need to use washing soda instead(sodium carbonate) or Ion exchange resin
Answer: The answer is B: equals mass divided by volume.
just did the quiz
hope this helps :D