Para que serve as piramides alimentares?

What is the charge of bromine ion?

What is the difference between elements, compounds and mixtures in terms of particle theory?

What causes an object to slowdown or speed up

What mass will 33.6 l of nitrogen gas have at stp?

Which statement is true about the force of gravity? A. The earth has a greater gravitational effect than the sun. B. The moon has a greater gravitational effect that the sun. C. The moon has a greater gravitational effect than the earth. D.

How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5g of na2s and 12.1g cuso4?

Which elements can be found in the sun? a. hydrogen and oxygen b. helium and oxygen c. hydrogen and helium d. hydrogen and nitrogen?

A sample of hydrogen gas at 2.0 atmospheres and 273 k occupies a volume of 5.0 liters. the gas sample is completely transferred to a 10.0-liter sealed, rigid container.

To make sure that the white powder was all sodium chloride and not mixed with sodium hydrogen carbonate, would you need to add a little less or a little more hydrochloric acid to the reaction?

A 10.0 gram sample of h2o at 23.0c absorbs 209 joules of heat. what is the final temperature