Supposing the half-life of element X to be 1 year, if you have a 100 gram sample of X, how much of element X would be left after 4 years? (Do not use significant digits in answering this question.) 75 g
50 g
25 g
6.25 g

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?

See the attachment and solve question 5th

What accounts for an increase in the temperature of a gas that is kept at constant volume? a. energy has been removed as heat from the gas. b. energy has been added as heat to the gas. c. energy has been removed as work done by the gas. d. energy has been added as work done by the gas.