Isotopes of an element must have different

(1) atomic numbers

(2) mass numbers

(3) numbers of protons

(4) numbers of electrons

If an atom has 5 valence electrons, how many electrons does it need to gain to achieve a stable electron configuration?

A 0.0200 gram piece of unknown alkaline earth metal, M, is reacted with excess 0.500 M H ₂S O₄, and the hydrogen gas produced is collected over water. The total gas pressure inside the collecting tube is 1.01 atm, the air temperature 24.0 ° C.

In the following reaction, is sb reduced or oxidized? 2sb (s) 6h2so4 (aq) sb2 (so4) 3 3so2 6h2o

Scientists test a hypothesis by?

Przykładny wykorzystania wodorotlenku amonu

According to the graph, which activity has used the largest amount of water over the past twenty years?

Tiffany leaves balloons filled with helium gas inside her car in on a sunny day when she returns to her car some some of the balloons are much larger and a few have popped explain what happened

If the pH indicator bromothymol blue was added to the nitric acid solution, it's colour would be?

Which statement describes a chemical reaction? Atoms in the products are rearranged to form new substances. Atoms in the reactants are rearranged to form new substances. Atoms in the products change into new atoms to form new substances.

The gases CO₂ (g) and NH₃ (g) can be liquefied at 20°C by compressing them to sufficiently high pressures. A student claims that NH₃ (g) can be liquefied at a lower pressure than CO₂ (g) can be liquefied.