Which of the following equations represents a double-displacement reaction?

A. FeS (s) + 2HCl (aq) ® H2S (g) + FeCl2 (aq)

B. 2Sb (s) + 3I2 (g) ® 2SbI3 (s)

C. Zn (s) + H2SO4 (aq) ® ZnSO4 (aq) + H2 (g)

D. 2HgO (s) ® 2Hg (l) + O2 (g)

The approximate recommended daily dietary intake of the amino acid valine, c5h11no2, is 2.60 g for a 100 kg adult. what is this requirement in moles?

Why does chlorine have an atomic mass of 35.5

What is a conductor/insulator? and how do they work?

If the temperature of an object is 335K, how would his be expressed on the celsius scale?

A black bear consumes 100 kg of food in a single month. How much of this food would be field mice and rats (rodents) ?

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.

2) Which of the following is a true statement? A: All the atoms of an element must be identical. B: Compounds may be separated by physical means. C: Mixtures may not be separated. D: Homogeneous is one type of compound.

How to tell the difference between ionic and covalent bonding?

The combustion of propane may be described by the chemical equation C3H8 (g) + 5O2 (g) ⟶3CO2 (g) + 4H2O (g) C3H8 (g) + 5O2 (g) ⟶3CO2 (g) + 4H2O (g) How many grams of O2 (g) O2 (g) are needed to completely burn 83.3 g C3H8 (g) ?

Was the relationship among temperature, heat, and thermal energy?