Select the correct answer.

An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?

A. 10

b. 20

D. 0

E. 200

On the pH scale, which value represents an acid? 2 8 12

A quantity of Lithium reacts with sulfuric acid (H2SO4) to produce. 10 g of hydrogen. How many grams of lithium are required?

A sample of benzene was vaporized at 25◦C. When 37.5 kJ of heat was supplied, 95.0 g of the liquid benzene vaporized. What is the enthalpy of vaporization of benzene at 25◦C? 1. 30.8 kJ/mol 2. 13.4 kJ/mol 3. 43.0 kJ/mol 4. 6.09 kJ/mol 5. 25.6 kJ/mol

What explains the change in ionization energy that occurs between removing the first and second electrons from an atom

What intermolecular forces occur between two methane molecules?

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.