Chemistry Answers

The first law of thermodynamics hints that __________.

a. net energy flow to or from any system comes from the surroundings.

b. net heat flow to or from any system comes in either energy or work.

c. net energy flow to or from any system comes in either heat or work.

d. net energy flow to or from any surroundings comes in either heat or work.

The amount of heat absorbed or released by a chemical reaction at constant atmospheric pressure .

a. enthalpy of reaction

b. enthalpy of products

c. enthalpy

d. standard molar enthalpy

Thermal decomposition of limestone to form calcium oxide and carbon dioxide is ________.

a. partly exothermic

b. exothermic

c. endothermic

d. both endothermic and exothermic

Explain the phenomena or theory involves certain actions affects the rate of reaction

using platinum in manufacturing nitric acid reduces the production cost

A metal has an atomic radius of 0.1335 nm . The volume of its cubic unit cell is

2.9305 x10-23 cm3. What is the geometry of the unit cell?

If the pH of 2.55 L calcium hydroxide solution, Ca(OH)2, is 11.64, calculate the amount (in gram) of calcium hydroxide in the solution.

Name an advantage and a disadvantage of H/Het and Het/Het eliminations.

How does equilibrium affect the usefulness of a manufacturing process?

(at least 3 sentences)

Calculate the moles of sulfate ions found within 613.5 mL of 3.71M Al₂(SO₄)₃ solution. Include the appropriate number of sig figs and unit with substance. 

if a 0.22560g of sodium bicarbonate is titrated with 0.1165N sulphuric acid. what volume of acid is required to reach the end point?

What is the greatest amount of AlCl3 (in grams) that can be made with 114 grams of Al and 186 grams of Cl2? Which is the limiting reactant? Which reactant is in excess? (Al=26.98) (Cl=35.46) Al + Cl2 --> AlCl3

What are the relationship of the main important of each sample to the acidity and basicity of the solution