Which of these represents the release of chemical energy?

a. pouring gasoline into a tank

c. a toy car running down a ramp

b. burning charcoal in a grill

d. warming food in a microwave

A sample of aluminum absorbs 9.86 J of heat, upon which the temperature increases from 23.2°C to 30.5°C. Since the specific heat capacity of aluminum is 0.90 J/g-K, what is the mass of the sample?

What is the hyphen notation of nitrogen

How does the type of precipitation change currently?

Why is it that nitrogen is unreactive

The least condensed state of matter is

What is the meaning of polyatomic

Rank these systems in order of decreasing entropy:? 1 mol methane gas at 273K and 40L 1 mol helium gas at 273K and 40L 1 mol hydrogen gas at 273K and 40L 1 mol helium gas at 273K and 20L 1/2 mol helium gas at 273K and 20L 1/2 mol helium gas at 100K

The movement of thermal energy from a warmer object to a cooler object is called a. heat. b. temperature. c. motion. d. momentum.

What is the mass of 1.84 mol NaCl? Give your answer to the correct number of significant figures. (Molar mass of NaCl = 58.44 g/mol)

Is a molecule positive or negative?