Project #2863 - Chemistry (17)questions

1)Classify each of the following as a pure substance or a mixture. If it is a pure substance, is it an element or a compound? Explain your answer.

a.fluorine (used to make fluorides, such as those used in toothpaste) b. toothpaste c.calcium fluoride, CaF2, from the naturally occurring ore fluorite(It is

used to make sodium monofluorophosphate, which is added to some

toothpastes.)

2Write the chemical formula for each of the following compounds. List the symbols for the elements in the order that the elements are mentioned in the description.

a.a compound with molecules that consist of two phosphorus atoms and five oxygen atoms.

b. a compound with molecules that consist of two hydrogen atoms and one sulfur atom.

c.a compound that contains three calcium atoms for every two nitrogen atoms.

d. a compound with molecules that consist of 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.

3)Atoms of magnesium and oxygen form ions and ionic bonds in a similar way to atoms of sodium and chlorine. The difference is that instead of having each atom gain or lose one electron, each atom of one of these elements loses two electrons, and each atom of the other element gains two electrons. Describe the process that leads to the formation of the ionic bond between magnesium and oxygen atoms in magnesium oxide. Your answer should include mention of the charges that form on the atoms.

4)How may protons and electrons do each of the following ions have?

a. N3

b. Ba2+

5)When atoms of the following elements form ions, what charge or charges would the ions have?

a. oxygen

b. Br

c. silver

d. Cu

e. magnesium

f. Al

g. sodium

h. Li

6)How many valence electrons do the atoms of each of the following elements

have? Write the electron configuration for these electrons. (For example, fluorine has seven valence electrons, which can be described as 2s2 2p5.)

a. oxygen, Ob. boron, Bc. neon, Ned. phosphorus, Pe. carbon, C

 

Chapter6

1)Write the name for each of these monatomic ions.

a. Na+

b. Br-

c. Al3+

e. Se2-

f. Zn2+

g. Cr3+

d. Mn2+

2)Write the formula for each of these monatomic ions.

a. strontium ion b. aluminum ion c. silver ion d. nickel(II) ion e. potassium ion

f. oxide ion g. chloride ion h. copper(I) ion i. mercury(II) ion

3)Write the name for each of these polyatomic ions.

a. OH-c. HCO3- b. CO32-

4)Write the name for each of these chemical formulas. a.CdI2 (a nematocide—that is, it kills certain parasitic worms.) b. Ca3P2 (in signal flares) c.Au(OH)3 (used in gold plating) d. FeCl2 (in pharmaceutical preparations) e.NH4HSO4 (in hair wave formulations)

5)Write chemical formulas for each of the following names.

barium chloride (used in manufacture of white leather) cobalt(III) oxide (used in coloring enamels) manganese(II) chloride (used in pharmaceutical preparations) iron(III) acetate (a medicine)

chromium(III) phosphate (in paint pigments)

magnesium hydrogen phosphate (a laxative)

6)The ionic compounds MgF2, NH4OH, Ba(NO3)2, Na2HPO4, and Cu2O are all used to make ceramics. Write the name for each of these compounds.

7)The ionic compounds barium bromide, silver phosphate, and ammonium iodide are all used in photography. Write the chemical formulas for these compounds

8)The compound represented by the ball-and-stick model to the left is used to add chlorine atoms to other molecules. Write its chemical formula and name. The central ball represents an oxygen atom, and the other atoms are chlorine atoms. List the chlorine atom first in the chemical formula.

9)The compound represented by the space-filling model to the left is used in processing nuclear fuels. The central sphere represents a chlorine atom, which in most cases would form one covalent bond but is sometimes able to form three bonds. The other atoms are fluorine atoms. Write this compound’s chemical formula and name. List the chlorine atom first in the chemical formula.

10)Write the name for each of the following chemical formulas.

a. ClO2 (a commercial bleaching agent) b. C2H6 (in natural gas) c. HI (when dissolved in water, used to make pharmaceuticals) d. P3N5 (for doping semiconductors) e. BrCl (an industrial disinfectant)

11)Write the chemical formula for each of the following names.

a. ammonia (a household cleaner when dissolved in water) b. tetraphosphorus hexasulfide (used in organic chemical reactions) c. iodine monochloride (used for organic synthesis) d. hydrogen chloride (used to make hydrochloric acid)

Subject Science
Due By (Pacific Time) 03/04/2013 10:05 am
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