Given the balanced equation representing a reaction:

2NaCl → 2Na + Cl2

To break the bonds in NaCl, the reactant must

(1) absorb energy (3) destroy energy

(2) create energy (4) release energy

If aqueous solutions of lead (II) nitrate and sodium sulfate, which insoluble precipitate is formed? Select one: a. NaNO3 b. Na2NO3 c. PbSO4 d. Pb2SO4 e. PbS

Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 155.

Determine the number of molecules contained in 1 mole of sodium sulfate

Write a net ionic equation to show that oxalic acid, h2c2o4, behaves as an acid in water. consider only its first ionization.

your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

The specific gravity of iron is 7.87, and the density of water at 4.00 ∘C is 1.00 g/cm3. You can use this information to find the density of iron. Find the volume occupied by 4.50 g of iron.

The volume of a gas is 93 ml when the temperature is 91? c. if the temperature is reduced to 0? c without changing the pressure, what is the new volume of the gas?

15.434 g of kcl (m. m 74.55 g/mol) is dissolved in water up t a total volume of 500.0 mL. the density of this solution is 1.02 g/mL. what is the concentration of he solution in molality

Determine the molar mass of an unknown monoprotic acid to two decimal places if 20.01 ml of a 0.098 m naoh solution were used to titrate 0.215 g of the unknown acid

A diatomic molecule with a triple covalent bond is A. H2 B. N2 C. O2 D. Br2 (P. S. The answer turned out to be B. N2)