Magnesium oxide added to water forms magnesium hydroxide

What is the concentration of your solution? (Your unknown sample is known to be about 1 M, but you need to determine the concentration to 3 significant figures using titration.

Which change occurs when an atom in an excited state returns to the ground state? (1) Energy is emitted. (2) Energy is absorbed. (3) The number of electrons decreases. (4) The number of electrons increases.

Read the following chemical equation. Al + Cl2 → AlCl3 Which of the following fractions can be used for the mole ratio to determine the mass of Al from a known mass of AlCl3? 2/1 3/2 2/2 2/3

Why is the periodic table such a brilliant piece of work? Explain and give two reasons.

Why do protons stay together in the nucleus rather than repel each other? a) Electrons in surrounding atoms cancel the repulsive forces between protons. b) Electrostatic forces between protons and neutrons hold the nucleus together.

The addition of an acid to water increases the [H30*) of the solution and increases the solution pH. True or False True False

31.65 mL volume of 1.07 M Fe (NO3) 3 is mixed with 44.96 mL of 0.79M Fe (NO3) 3 solution. Calculate the molar concentration of the final solution. Save rounding until the end.

At standard pressure, during which physical change does the potential energy decrease?

How are inner and outer planets different?

What process do body cells use to divide