Brainliestttme :

zinc metal reacts with hydrochloric acid (hcl) to produce hydrogen gas.

what best describes this reaction?

a single replacement reaction takes place because zinc is more reactive than hydrogen.
a single replacement reaction takes place because zinc is more reactive than chlorine.
a double replacement reaction takes place because zinc is less reactive than hydrogen.
a double replacement reaction takes place because zinc is less reactive than chlorine.

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

When a septic tank backs up a goes in to clean it out

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?