(SLO #2) A hydrate is a chemical compound that contains small amounts of water that are chemically bound to the crystal. These compounds are typically ionic salts, and the water bound to them is referred to as the water of hydration. The water molecules can be easily removed by heating the hydrate. This produces a dry (anhydrous) form of the ionic compound. For example, copper(II) chloride dihydrate (CuCl2 ∙ 2H2O) is converted to anhydrous copper(II) chloride (CuCl2) if heated to about 110°C: CuCl2 ∙ 2H2O (s) → CuCl2 (s) + 2H2O (g)   A student was given a sample of copper(II) chloride dihydrate. She weighed the sample in a dry covered porcelain crucible and obtained a mass of 25.47 g for the crucible, cover, and hydrated sample. The mass of the empty crucible and cover had been found earlier to be 23.78 g. She then heated the crucible to drive off the water of hydration, keeping the crucible at red heat for at least 15 minutes with the cover slightly ajar. On cooling, she found the mass of the crucible, cover, and its anhydrous contents to be 25.11 g. The following table does not need to be filled in (table not graded), but is here to help you organize your thoughts similar to our lab:   Mass of the crucible and cover   Mass of the crucible, cover, and hydrate   Mass of the crucible, cover, and anhydrous salt   Mass of the solid hydrate   Mass of the anhydrous salt   Mass of H2O lost after heating     From the information given, what is the mass of water in the hydrate?

Which of the following chemical formulas is incorrect?:

(SLO #4) How many neutrons, electrons and protons are represented by the symbol ? (32P3-)

Which of these is an incorrect name for the indicated molecule?

When 1 mole of Na3PO4 is dissolved in water, which of the following would be true?

Solid copper(II) oxide reacts with hydrogen gas to produce copper metal and water. The correct chemical equation that describes this reaction is:

(SLO #2) Density is defined as the mass of a substance divided by it’s volume. You have a white crystalline solid that you need to determine the density of. To do this you weigh a graduated cylinder containing 8.5 cm3 of kerosene and find its mass to be 126.71 g. You then transfer a quantity of the crystalline solid to the cylinder containing the kerosene (ionic substances will not dissolve in kerosene). After adding the crystalline solid, you find that the volume of the liquid kerosene rose to 15.3 cm3 and that the combined mass of the cylinder, kerosene and sample was 145.53 g. What is the density of the crystalline solid?

Consider the following compounds when answering questions 43 – 46: (Let me know if the image does not load) What intermolecular force(s) can methanal (above on left) form?

(3 points) What are the coefficients of the balanced chemical equation for the reaction between methane (CH4) and oxygen gas (O2) reacting and producing methanol (CH3OH)? (You may want to write out the chemical equation yourself).

X and Y are two species, each consisting of one nucleus and a number of electrons. The two species are found to contain the same number of protons, the same number of electrons, and a different number of neutrons. Which of the following statements about X and Y is correct?