How do chemical reactions impact our local water supply?

The "hardness" of water is usually expressed as parts per million (ppm) by mass of caco3. what is the molar concentration of ca+2 ions in a water sample with a hardness count of 175 ppm?

4 HF (g) + SiO 2 (s) → SiF 4 (g) + 2 H2 O (l) What mass of water (in grams) is produced by the reaction of 67.0 g of SiO2?

Substance added in the final stages to remove sultry from coal

Commercial concentrated aqueous ammonia is 28% NH3 by mass and has a density of 0.90 g/mL. You may want to reference (Pages 539 - 541) Section 13.4 while completing this problem. Part A What is the molarity of this solution?

How does an enzyme increase the rate of the chemical reaction it catalyzes?

Why are noble metals for example Rhodium, Palladium, Platinum, and Iridium largely used in chemical manufacturing as heterogeneous catalyst?

If displacement is decreasing, then velocity is:

True or false an example of a theory is Newton's theory of gravity

What is a molecule with atoms from two or more different elements?

How do you find the percent composition of CuBr2