If the temperature changes in a chemical reaction, what has occured?

A) energy was destroyed

B) energy was created

C) there was no energy transfer

D) energy was transferred

672.5 is 60.4% of what number?

Genus. kingdom Besides humans, which of the following organisms belongs to the species sapiens? monkeys gorillas apes None of these choices are correct.

A compound weighing 115 g contains 68.3 g of carbon, 13.2 g of hydrogen, 15.9 g of nitrogen, and some amount of oxygen. What is the mass percent of oxygen in the compound?

Friction is the force that occurs when: A. one object attracts or repels another. B. one object is rubbing against another. C. one object pushes another object outward. D. two objects are distance from each

What is 16.00 kPa in atm?

Define prediction and explain how it is used to formulate a hypothesis.

A group of organisms that breed and produce offspring that can breed. A. Species B. ecosystem C. Biodiversity

What is the molality of a solution containing 100 grams of glucose (C6H12O6, molar mass = 180 g/mol) dissolved in 2.5 kg of water? 0.22 m 72 m 7200 m 40 m

A battery is constructed based on the oxidation of magnesium and the reduction of cu2+. the initial concentrations of mg2 + and cu2 + are 1.2*10-4 m and 1.44 m, respectively, in 1.0-liter half-cells. how long can the battery deliver 5.

A buffer solution is made that is 0.417 M in and 0.417 M in. If for is, what is the pH of the buffer solution? pH = Write the net ionic equation for the reaction that occurs when 0.120 mol is added to 1.00 L of the buffer solution.