How properties before and after a chemical reaction can be used to determine if a chemical reaction occurred

Calculate the number of grams of 4.0 % (m/m) NaCl so Luton that contains 7.00 g of NaCl?

The energy derived from the movement of H + ions down an electrochemical gradient from the intermembrane space into the matrix is used to drive the synthesis of ATP. How many H + ions must be moved into the matrix for the synthesis of 1 ATP?

A student wanted to make 11.0g of copper chloride. The equation for this reaction is CuCO3 + 2HCl = CuCl2 + H2O + CO2 Calculate the mass of copper carbonate the student should react with dilute hydrochloric acid to make 11.0g of copper chloride.

How many grams of calcium nitrate are needed to make a 3.30 L of a 0.10 M solution?

A reproducible measurement is an accurate one. Sometimes true? Always true? Never true?

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.