Which of these are made up of matter? Check all that apply.

parts of outer space where there is no air or atoms

salt dissolved in water

air in the lower levels of the Earth's atmosphere

leather made from cow hides

metal after if has been molded

Haw is the nitrogen cycle important to humans?

1. What is the mass of 25.0 L of neon at STP?

What type of energy is a ball on the top of a hill

A rock has the density of 8g/ml. If the rocks mass is 2g what is the rocks volume?

Using a molar heat of combustion of - 890 kJ/mol, The minimum mass of methane that must be burned to warm 5.64 kg of water from 21.5°C to 77.4°C, assuming no heat losses to the environment is ab. c g. Put your answer for ab. c in the blank.

How do the reaction rates change as the system approaches equilibrium?

Based on the symmetry of the molecules, which is a polar molecule? SeCl2 (bent) BeCl2 (linear) BF3 (trigonal planar) CF4 (tetrahedral) O2 (diatomic linear)

7) change 21.1 mg into grams

Why is an ionic solution a good conductor of electricity while a covalent solution is a poor conductor

How many grams of zinc metal will react completely with 8.2 liters of 3.5 M HCl? Show all of the work needed to solve this problem. Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g)