Which of the following elements is an alkali metal? A. potassium (K) B. calcium (Ca) C. chromium (Cr) D. germanium (Ge)

Which mineral leaves a green-black powder when rubbed against an unglazed porcelain plate

Which difection do most weather systems move in the united states

What is the solubility product expression for Ag2CO3

How many moles of KBr will be produced from 7 moles of BaBry? BaBr2 + K2SO4 → KBr + BaSO4

What is an ore? an object that has been recycled an article of clothing that is made from natural fiber a rock that contains enough of a metal to be worthwhile to extract a fossil fuel that can be burned to generate electricity

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