What is the difference between mass number and atomic number

What is the chemical formula for the compound formed between sodium and sulfur?

Homeostasis is maintained by which of the following? Diffusion of molecules from an area of high concentration to lower Osmosis of water into an area of high solute concentration Active transport of molecules to an area of high concentration All of

Each of the compounds that you tests contained chlorine, which is a poisonous gas. Why was this test safe to perform (it was, or your lungs would have turned to mush) without a gas mask?

Calculate the percentage by mass of water in magnesium sulfate heptahydrate, MgSO4•7H2O Enter your answer with 3 significant figures

During heating of the hydrate, loss due to splattering can cause a serious error. if a significant amount of sample is lost, will the calculated waters of hydration be too high or too low? explain.

Which statements indicate what the fossil record suggests about evolution on Earth? Check all that apply. Humans have only recently existed on Earth. Organisms originally lived only in Earth's water. Life on Earth started when water formed on Earth.

What does homogeneous mixture of elements mean

As an acid is added to neutral water the [OH-] will

What is the mass in grams of 5.00moles of CH4? How many moles of oxygen gas O2, are present in a 38g sample of O2

25 In general, for a gas at a constant pressure, A the temperature of the gas is inversely proportional to its volume B. the temperature of the gas is inversely proportional to its pressure C.