Question

1) Which of the following statements is NOT true about an exothermic reaction. A) Exothermic reactions release (give off) heat. B) Exothermic reactions absorb (take up) heat. C) The reactants have more potential energy than the products. D) Exothermic reactions can be used to produce energy (like heat and electricity). E) Both B and C are not true.

2) Which of the following could exhibit hydrogen bonding? A) lithium chloride (LiCl) B) water (H2O) C) hydrogen cyanide (HCN) D) formaldahyde (CH2O) E) none of these can have hydrogen bonding

3) Which of the follow is NOT true A) The density of a liquid is greater than the density of a gas. B) At a given temperature and pressure, a mole of a gas has the same volume regardless of the gas. C) Heat is released in some chemical reactions and absorbed in other reactions. D) There is a limit to how small matter can be divided. Once the particle is a molecule, if it is divided the matter will be something different. E) In chemical reactions the products often have more mass than the reactants because matter is created in chemical reactions.

4) Which of the following compounds is polar? (Hint: make dot structures for these compounds) A) O2 B) CO2 C) SOCl2 D) N2 E) all of these are polar

5) Which of the following represents a chemical change? A) water boiling to form steam B) ice melting to form liquid water C) sugar dissolving into hot coffee D) steel turning to rust in salt air

6) Considering the limiting reactant concept, how many moles of copper(I) sulfide are produced from the reaction of 1.00 mole of copper and 1.00 mole of sulfur? 2 Cu(s) + S(s) Cu2S(s) A) 0.500 mol B) 1.00 mol C) 1.50 mol D) 2.00 mol E) none of the above

Answer 1

Answer:

Explanation:

One of your salts generated an endothermic reaction with water, while the other salt generated an exothermic reaction with water. Let me first reveal the identity of your salts. An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.”

So B and C are not true.