A scientist is studying a chemical reaction. She predicts that after the reaction the product will have less chemical potential energy than the reactants had originally

Which would show an example of how physical changes are reversible? A cutting a gold bar in two pieces and then putting the pieces next to each other B burning a match and then relighting it C melting tin and then cooling it into a mold D combining

What is handling of materials and chemicals

Identify the 4 classification system for plants

6.41 * 10 ^ 6 j to kcal

Ammonia react with phosphorus acid to form a compound that contains 28.2% of nitrogen 20.8%, phosphorus 8.1% of hydrogen 42.9%oxygen. Calculate the empirical formula of this compound

Which statement (s) is/are true of acid-catalyzed alcohol dehydrations? A) Protonation of the alcohol is a fast step. B) Formation of a carbocation from the protonated alcohol is a slow step.

Water is composed of hydrogen and oxygen, True Or False

Why must chromosomes be copied before cells divide

4) Terry's dog is racing down the lane in the part toward the east. The dog travels 36 meters in 18 seconds before it stops running. The velocity of the dog is. A. 2 m/s east B. 4 m/s east C. 8 m/s east D. 10 m/s east

When a unicellular organism grows, the number of its cells increases. (True or False)