What's the difference between a mixture and a substance

Consider the following gas samples: 10. g of hydrogen gas, 10. g of helium gas, 2.5 moles of nitrogen gas, 110. g of carbon dioxide gas, and 365 g of sulfur hexafluoride gas.

If you add 4.00 ml of pure water to 6.00 ml of 0.750 m nacl solution, what is the concentration of sodium chloride in the diluted solution?

How many formula units are there in 2.3g of NH4SO2

A scientist is interested in finding out the effect of soil quality on crop quality. Would an experimental or observational study design be more appropriate?

Could a nucleus that has more than one proton but no neutrons exist? Explain.

Assume that the potential energy of the products in a chemical reaction is 60 kilojoules. this reaction would be exothermic if the potential energy of the reactants were

Which type of ions are formed when an acid is dissolved in water?

According to the collision theory, when can a chemical reaction occur? When enough activation energy is added to correct the orientation of the particle collisions When reactants collide with enough energy to intersect their valence shells and form

Why is ice less dense than water? A. When water freezes, it forms a crystal structure with less volume than liquid water. B. Ice crystallizes with an open structure, and the gaps that form between the water molecules in ice increase its volume. C.

The difference between isotopes for the same element will be found in the atoms' a. number of protons. b. number of electrons. c. number of neutrons. d. charges.