Which of the following shows 3x + 15 + 6x - 7 + y in simplest terms?

18x + 8y

9x + y + 8

26xy

9x + 22 + y

Is warm air lighter than cold air

A chemistry student found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?

Define basal metabolic rate

Which element is malleable and can conduct electricity in the solid phase? 1) idine 2) phosphorus 3) sulfer

Why does his teacher ask him to balance the equation by including the correct coefficients?

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?