How many protons and electrons does an osmium atom have? a niobium atom?

Which method would be best to separate components of a mixture that is made up of 2 liquids

The standard heat of formation for solid copper is zero. True False

A sample of an ideal gas at 1.00 bar and a volume of 1.59 l was placed in a weighted balloon and dropped into the ocean. as the sample descended, the water pressure compressed the balloon and reduced its volume. when the pressure had increased to 80.

By analogy to examples given in the text, predict what gas forms when na2so3 (s) reacts with hcl (aq). express your answer as a chemical formula.

If 0.0262 mol of cacl2 is dissolved in water to make a 0.520 m solution, what is the volume of the solution?

Energy stored in the bonds that hold together the atoms and molecules of all substances is called Energy stored in the bonds that hold together the atoms and molecules of all substances is called

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

If a color change occurs when two solutions are mixed has a chemical reaction likely occurred?

Using the following thermochemical data, what is the change in enthalpy for the following reaction? Ca (OH) 2 (aq) + 2HCl (aq) → CaCl2 (aq) + 2H2O (l) CaO (s) + 2HCl (aq) →CaCl2 (aq) + H2O (l), ΔH = - 186kJ CaO (s) + H2O (l) →Ca (OH) 2 (aq), ΔH =

1. Calculate the end velocity of a rocket that traveled 16km in 2 seconds. distance time 2. Calculate the rockets acceleration m with a start velocity of 0m/s and the end velocity from #1 for 10 seconds.