Why should scientists control most possible variables in their experiments?

65.5g of copper reacts with __g of oxygen to produce 81g copper (I) oxide

Determine the mass of 2.94 x 10^34 molecules of decane

During a reaction, thermal energy from the environment is converted into chemical energy stored in the products. Which of the following can you determine? A. The reaction is single replacement. B. The reaction is exothermic. C.

A student placed 12.5 g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached.

Nature operates the same way everywhere in the universe except where we have evidence True Or False

The atomic mass of carbon is 12.011 g/mol. how many atoms of carbon have that exact mass? why?

Which option is true about the effect of polarity on solubility? Select all that apply. Polar solutes dissolve better in water than in oil. Polar solutes have the greatest solubility in nonpolar solvents.

Which change results in a release of energy? 1. The melting of H₂O (S) 2. The boiling of water (L) 3. The evaporation of H₂0 (L) 4. The condensation of H₂0 (G)

What changes nitrogen gas in the air to nitrogen compounds that fall to the ground

Which element has an isotope mass number of 32 and is used as an ecological tracer?