Is adding salt and vinegar to an old penny a chemical or physical change

Consider the following balanced reaction between hydrogen and nitrogen to form ammonia: 3H2 (g) + N2 (g) →2NH3 (g) How many moles of NH3 can be produced from 24.0 mol of H2 and excess N2?

What is the mass of a 1.71-l sample of a liquid that has a density of 0.921g/ml?

Which pair of compounds are structural isomers of each other? pentane and 2-methyl pentane pentane and hexane hexane and 2-methyl pentane 2-methyl hexane and 2-methyl pentane description?

Phosphoric acid reacts with water to yield dihydrogen phosphate ions and hydronium ions: h3po4+h2o⇌h2po4-+h3o + identify the conjugate acid-base pairs.

The chemical formula of glucose is carbon 6 hydrogen 12 oxygen 6. What are the names of the elements in glucose and how many atoms of each element are present in a glucose molecule?

At a certain temperature, 0.4011 mol of N 2 and 1.501 mol of H 2 are placed in a 3.00 L container. N 2 (g) + 3 H 2 (g) - ⇀ ↽ - 2 NH 3 (g) At equilibrium, 0.1801 mol of N 2 is present. Calculate the equilibrium constant, K c. K c =

Which of the following is the correct name for the compound hgs? mercury sulfide mercury (i) sulfide mercury (ii) sulfide mercury monosulfide?

You are given 60 ml of 2.0 m naoh solution. how many ml of 6.0 m hcl solution is needed to completely neutralize the naoh solution? s

45 2.0 2. How many joules of heat are needed to raise the temperature of 048 kg of aluminum from 21°C to 94°C, if the specific heat of aluminum is 900 J/g °C?

Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Note: you are writing the molecular, and not the net ionic equation. → CaCl2 (aq) + H20 (l)