Which statement describes evidence of chemical reaction

If the volume of a container of gas is reduced what will happen to the pressure?

What is the lowest possible value of n for a d atomic orbital?

The radioisotope that has the longest half-life is the best to use in powering planet and space exploration vehicles because they can travel farther. Which radioisotope is the best to use?

Boiling cannot occur if the vapor pressure of a liquid is 745 millimeters of mercury and the atmospheric pressure is 761 millimeters of mercury. a. True b. False

What is a cathode? A. The electrode that releases ions into the solution B. The electrode at which a reduction reaction occurs C. The electrode that is oxidized in a redox reaction D. The electrode that donates electrons to the system

Which of the following compounds is the most soluble in water? a) propanoic acid b) propane c) propanal d) l-bromopropane

What mass of solid Na2CO3 is required to make 250.0mL of a 0.125M solution of Na2CO3?

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)