What is the central part of a atom called

Ammonia is a covalent compound used in many cleaners. What is its chemical formula?

Is a crumbled piece of paper weight, mass, density or appearance changed? I think density.

Chemistry How many water molecules are in 1.9 moles of water? Use 6.022 X 1023 for Avogadro's Number! Use "e-notation" when answering. 6.022 X 1023 would be entered as 6.022e23

If the volume and Kelvin temperature are reduced by one-half what will happen to the pressure?

Using the average atomic masses from the periodic table, calculate how many moles the following masses represent: a) 4.65g of C2H5OH, b) 7.94g of barium nitrate

Which is the correct name for MgSO4•7H2O?

Iron has a density of 7.86 g/cm^3. Calculate the volume of a piece of iron having a mass of 3.99 kg.

a student determines the mass of a 100 mL beaker filled with 50 mL of water to be 154.34 grams. After a tablet reacts with the water, the mass including the dissolved tablet is 157.26 grams. Show the work and find the mass gained below.

Why does ocean water in the eye of a hurricane rise about two feet

Co (g) + h2o (g) ⇌co2 (g) + h2 (g) kp=0.0611 at 2000 k a reaction mixture initially contains a co partial pressure of 1320 torr and a h2o partial pressure of 1760 torr at 2000 k. calculate the equilibrium partial pressure of co2.