What do repeated trials in an experiment allow a scientist to do?

Giving two reasons, classify air as a mixture or compound.

4. Is the following sentence true or false? A molecular formula shows the arrangement of the atoms in a molecule.

Which statement is true? In an exothermic reaction, the energy of the products is the same as the energy of the reactants. In an endothermic reaction, the energy of the products is less than the energy of the reactants.

When a metal is burned in a closed container, the mass of the container and its contents do not change. a. observation. b. law. c. theory.

The combustion of a hydrocarbon X (30 cm3) with 350 cm3 of oxygen at STP resulted in the formation of 440 cm3 of gaseous products.

Why are the spheres representing nitrogen and oxygen different colors

How many moles are in 16.94g of water?

Two compound samples are found to have the same mass percentages of the same elements. what can you conclude about the two samples

Sodium hypochlorite (Na xCl yO z) is the active ingredient in household bleach. A 250.0 g sample of sodium hypochlorite contains 77.2 g sodium, 119.1 g chlorine, and the remainder is oxygen. Calculate the empirical formula of sodium hypochlorite.

The tapeats sandstone in the grand canyon is an example of a clastic sedimentary rock. such clastic sedimentary rocks can be distinguished from biochemical sedimentary rocks by