What element has 81 protons in the nuclei of its atoms?

A. Platinum

B. Uranium

C. Lead

D. Thallium

Why does the temperature of different layers of the atmosphere vary

You use energy to heat your home. What ultimately happens to the energy that you pay for in your heating bill? 1. The energy escapes your home and heats the outside. 2. The energy heats your home. 3. The energy disappears as it never exists. 4.

what component of rainforests provides nutrients to the soil and creates living conditions for bacteria and other microorganisms

An organic compound in which a carbonyl group is bonded to one carbon atom and one hydrogen atom is a (n) amide. aldehyde. ketone. ester.

When substances go through chemical changes, which of the following will always happen? A. Exactly one new substance will form and one will be destroyed. B. One or more substances will be completely destroyed. C.

Action - reaction forces don't cancel each other. A. True B. False

An equilibrium is dynamic. True False

In a lab, a student dissolves 6.9 g of sodium chloride (NaCl) in 125 g of water (H2O). What is the molality concentration of the solution?

Audrey is driving 50 miles in 2 hours what is her average speed?

Water has a specific heat of 4184 J / (kgK) how much energy is needed to increase the temperature os a kilogram of water 5C?