Some Basic Conc...

The matter is neither created nor destroyed during any physical or chemical change. This statement is of the :

Calculate the percent composition of carbon in $$C_6H_{12}O_6$$ :

When mass is enclosed in a system and no transfer of material and energy is allowed in or out, it's _____ will never change.

What is the percent of composition of the compound that forms when $$222.7g$$ of N combines compleletly with $$77.4g$$ of O?

Which of the following statement is incorrect for the composition of water?

A mixture contains $$2.5$$g $$CaCO_3$$ and $$3.0$$g $$NaCl$$. What is the percent by mass of $$CaCO_3?$$

Dalton’s atomic theory was based on:

One volume of nitrogen combines with one volume of oxygen to form two volumes of nitric oxide. Calculate the amount of each reactant required to produce 250 ml of nitric oxide.

When two molecules of hydrogen react with one molecule of oxygen, the mass of reactants is $$36$$, what is the mass of products?

Mass of beaker=20 g
Mass of beaker+mixture=50 g
Mass of washed and dried sand=5 g
Find the percentage of sand in the mixture.