Which two particles of the atom have nearly identical masses? 

The density of water is approximately 1 g/cm³. Which of these substances will sink in water? 

What is the atomic symbol and mass number for an atom containing 50 protons and 64 neutrons? 

A pool is treated with calcium hypochlorite pool shock. If Ca(OCl)₂ has 50.0% available chlorine by mass, what ppm chlorine increase will result from the addition of 2.00 kg of pool shock to a 40.0 x 10³ L swimming pool? (density of water = 1.00 kg/L)

What is the concentration of lithium ions in 0.450 M Li₂SO₄?

A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 6.90 mL. If the metal weighs 9.84 g, what is the density of the metal in g/mL? (Just put the number and no units.) 

Which one of the following represents the molecular equation for the reaction of NH₃ with HI?

A 1.000 g sample of an unknown compound containing only carbon, hydrogen, and oxygen was analyzed through combustion analysis and yielded 2.224 g of CO₂ and 0.3035 g of H₂O. What is the compound’s empirical formula?

What quantity in moles of CH₃OH are there in 150.0 mL of 0.210 M CH₃OH?

The number -1.025 × 10⁻³ when taken out of scientific notation would be