The energy needed for the changes in the water cycle to take place comes from

A: Wind

B: Green Plants

C: Nitrogen

D: The sun

A person uses 770 kcal on a long hike. Calculate the energy used for the hike in each of the following energy units. What is the energy in joules? Express the energy in joules to two significant figures.

According to the collision theory, which is required for a high number of effective collisions?

Which characteristics do photosynthesis and cellular respiration have common

Because of hydrogen bonding, Select one: a. lakes freeze from the bottom up b. ice is less dense than liquid water c. ice sinks to the bottom of water d. liquid water is less dense than ice

How to convert particles to mass

Calculate the ΔHrxn for the following reaction: CH4 (g) + 2Cl2 (g) - - > CH2Cl2 (g) + 2HCl (g) Use the following reaction and given ΔH's: CH4 (g) + Cl2 (g) - - > CH3Cl (g) + HCl (g), ΔH = - 99.

Select all that apply to diffusion. A solid cannot diffuse in to another solid. Solids can diffuse in liquids. Liquids can diffuse in liquids. It is the process of intermingling atoms from one substance into another.

We are all familiar with the general principles of operation of an internal combustion engine: the combustion of fuel drives out the piston.

A first order reaction has a rate constant of 0.816 at 25 oC. Given that the activation energy is 22.7 kJ/mol, calculate the rate constant at 34 oC. (enter answer to 3 decimal places)

Part b select the ester that is formed when propanoic acid reacts with isopropyl alcohol in the presence of heat and an acid catalyst.