The atomic number of an element is equal to the number of protons in each atom of the element. All helium atoms have 2 protons. What is the atomic number of helium?

What is the unit for electric current.

The following reaction does not proceed to a product: H2O + Cu - - > no reaction. Why is that? a. Copper has a lower activity than hydrogen and cannot replace it. b. The reaction cannot occur because water is a reactant. c.

What is the purpose of lasers?

A 1.00 L buffer solution is 0.150 M in HC7H5O2 and 0.250 M in LiC7H5O2. Calculate the pH of the solution after the addition of 100.0 mL of 1.00 M HCl. The Ka for HC7H5O2 is 6.5 * 10-5.

What is the change in temperature if 24g of water at 50°C absorbs 985 J of heat energy?

What is potential energy? The energy of change The energy of position or composition The energy of mass or volume The energy of motion

How many significant figures are in the measurement 0.023040 cm?

Can y'all give me some examples of physical changes

A nitrogen-containing compound shows no absorption band at ∼3400cm-1 and no absorption bands between ∼1700cm-1 and ∼1600cm-1. what class of compound is it

What is the mass of 35.2 ml of a solution that has a density of 1.12 g/cm (in dimensional analysis)