Pls solve this for me. Solid calcium carbonate reacts with hydrochloric acid (HCI) to form carbon dioxide gas,
solid calcium chloride and water.

Reactants Products:
Chemical Equation:
Balanced Chemical Equation:
Reaction Type:

What is the mass of 4 molecules of co2

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.