13. a. 6 moles
b. 5 moles
c. 5 moles
14. a. 2 moles
b. 621 grams
c. 28 grams
d. 415 grams
15. The actual mass is 66.6666666% but rounded it is 67%.
16. a. 87%
b. 53%
c. 40%
17. a. 68%
b. 10%
c. 6.8%
d.
18. a. Reusing is when something is used more than once. Recycling is when you convert an object into a new object.
b. Reusing: water bottles, paper
Recycling: cans, glass, plastic
19. a. water, fertilizer, air, soil
b. gold, silver, minerals, fossil fuels
20. a. reusing
b. recycling
c. reusing
21. The newspaper can be refused and recycled while the glass cannot.
Tuesday, July 16, 2013
Monday, July 15, 2013
Homework #5
1) The law of conservation of matter is that matter is neither created nor destroyed.
2) Scientific law summarizes what has been learned by careful observation of nature.
3) These expressions can be misleading because, according to the conservation of matter, atoms are never 'used up' or 'thrown away'.
4)
a. Not balanced.
Reactant side: Sn: 1, H: 1, F: 1
Product side: Sn: 1, H: 2, F: 2
b. Not balanced.
Reactant side: Si: 1, O: 2, C: 1
Product side: Si: 1, O: 1, C: 2
c. Balanced.
Reactant side: Al: 1, O: 3, H: 6, Cl: 3
Product side: Al: 1, O: 3, H: 6, Cl: 3
5)
a. The coefficient for hydrogen gas is 3.
b. The coefficient for NH3 gas is 2.
c. The coefficient for nitrogen gas is 1.
6)
a. 1 WO3 + 3 H2 --> 1 W + 3 H2O
b. 2 PbS + 3 O2 --> 2 PbO + 2 SO2
c. 4 Fe + 3 O2 --> 2 Fe2O3
7)
a. 1 Ca3(PO4)2 + 3 H2SO4 --> 2 H3PO4 + 3 CaSO4
b. 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O
8)
a. Yes.
Reactant side: Na, 2; S, 1; O, 4; K, 2; Cl, 1
Product side: Na, 2; S, 1; O, 4; K, 2; Cl, 1
b. No, when balancing equations, subscripts remain the same, but coefficients are altered to balance the equation.
c. 1 Na2SO4 + 2 KCl --> 2 NaCl + 1 K2SO4
9) It would take 400,000 seconds to spend one mole of dollars.
10)
a. 32g
b. 48g
c. 100g
d. 58g
e. 180g
11) This is because a mol is a unit of measure.
12)
a. 1 atom.
b. 0.5 atoms.
c. 0.1 atoms.
d. about 0.03 atoms.
2) Scientific law summarizes what has been learned by careful observation of nature.
3) These expressions can be misleading because, according to the conservation of matter, atoms are never 'used up' or 'thrown away'.
4)
a. Not balanced.
Reactant side: Sn: 1, H: 1, F: 1
Product side: Sn: 1, H: 2, F: 2
b. Not balanced.
Reactant side: Si: 1, O: 2, C: 1
Product side: Si: 1, O: 1, C: 2
c. Balanced.
Reactant side: Al: 1, O: 3, H: 6, Cl: 3
Product side: Al: 1, O: 3, H: 6, Cl: 3
5)
a. The coefficient for hydrogen gas is 3.
b. The coefficient for NH3 gas is 2.
c. The coefficient for nitrogen gas is 1.
6)
a. 1 WO3 + 3 H2 --> 1 W + 3 H2O
b. 2 PbS + 3 O2 --> 2 PbO + 2 SO2
c. 4 Fe + 3 O2 --> 2 Fe2O3
7)
a. 1 Ca3(PO4)2 + 3 H2SO4 --> 2 H3PO4 + 3 CaSO4
b. 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O
8)
a. Yes.
Reactant side: Na, 2; S, 1; O, 4; K, 2; Cl, 1
Product side: Na, 2; S, 1; O, 4; K, 2; Cl, 1
b. No, when balancing equations, subscripts remain the same, but coefficients are altered to balance the equation.
c. 1 Na2SO4 + 2 KCl --> 2 NaCl + 1 K2SO4
9) It would take 400,000 seconds to spend one mole of dollars.
10)
a. 32g
b. 48g
c. 100g
d. 58g
e. 180g
11) This is because a mol is a unit of measure.
12)
a. 1 atom.
b. 0.5 atoms.
c. 0.1 atoms.
d. about 0.03 atoms.
Sunday, July 14, 2013
Homework #4
#9-22 (p.151)
9) Active metals are more reactive than less active metals. Active metals are more likely to combine and form compounds with other elements which makes them more difficult to process and refine.
10)
11) This is because metals are reactive and combine with other elements.
12) A reaction between calcium metal with chromium(III) chloride would more likely occur because calcium metal is more reactive than chromium metal.
13) Zinc in a silver solution would cause a reaction because the more reactive material is in a less reactive solution.
14)
a. This is because the spoon would cause a reaction.
b. Pb^2+(aq) + Fe(s) ---> Pb(s) + Fe^2(aq)
15) Oxidation is the loss of one or more electrons that causes a metal to become a cation/aqueous solution. Reduction is the gain of one or more electrons that causes a cation/aqueous solution to balance its electrical charge and become a metal.
16)
a. Au^3+ + 3e^- ---> Au
b. V ---> V^4+ + 4e^-
c. Cu+ ---> Cu^2+ + 1e^-
17)
a. reduction.
b. oxidation.
c. reduction.
18)
a. Zinc
b. Nickel
c. Zinc
19)
a. Potassium
b. Mercury
c. Mercury
20)
a. Al + Cr^3+ ---> Al^3+ + Cr
b. Mn^2+ + Mg ---> Mn + Mg^2+
21)
a. Electrometallurgy is the use of electricity.
b. Pyrometallurgy is the use of heat.
c. Hydrometallurgy is the use of water.
22)
a. Electrometallurgy.
b. Pyrometallurgy
10)
11) This is because metals are reactive and combine with other elements.
12) A reaction between calcium metal with chromium(III) chloride would more likely occur because calcium metal is more reactive than chromium metal.
13) Zinc in a silver solution would cause a reaction because the more reactive material is in a less reactive solution.
14)
a. This is because the spoon would cause a reaction.
b. Pb^2+(aq) + Fe(s) ---> Pb(s) + Fe^2(aq)
15) Oxidation is the loss of one or more electrons that causes a metal to become a cation/aqueous solution. Reduction is the gain of one or more electrons that causes a cation/aqueous solution to balance its electrical charge and become a metal.
16)
a. Au^3+ + 3e^- ---> Au
b. V ---> V^4+ + 4e^-
c. Cu+ ---> Cu^2+ + 1e^-
17)
a. reduction.
b. oxidation.
c. reduction.
18)
a. Zinc
b. Nickel
c. Zinc
19)
a. Potassium
b. Mercury
c. Mercury
20)
a. Al + Cr^3+ ---> Al^3+ + Cr
b. Mn^2+ + Mg ---> Mn + Mg^2+
21)
a. Electrometallurgy is the use of electricity.
b. Pyrometallurgy is the use of heat.
c. Hydrometallurgy is the use of water.
22)
a. Electrometallurgy.
b. Pyrometallurgy
Wednesday, July 10, 2013
Homework #3
#26-34 (p.132)
26. Nonmetallic elements are more likely to loose electrons.
27. This indicates that noble gasses are nonreactive and very stable.
28. a. cation, b. cation, c. anion, d. anion, e. anion, f. cation, g. cation, h. anion
29. A. Copper metal and copper(II) are more similar because the only difference between them are electrons.
30. The diameter would be 206 pm.
31.
34. Argon and potassium would be in different places if the periodic table was organized by atomic weight as well as cobalt and nickel.
#1-8 (p. 151)
1.
The mantle: 40-2900km: the middle layer of the lithosphere.
The core: 2900km: Earth's center: extremely hot.
b. The crust serves as the main storehouse of chemical resources used in manufacturing consumer products. 3.
a. Mexico.
b. Japan.
c. China. 4. China produces the largest masses of the eight listed resources in the table.
5. Minerals are naturally occurring solid compounds that have the element while ores must be mined.
6. Percent of metal in the ore, type of mining and processing used to extract the metal from the ore, and the environmental impact of the mining and metal processing are all factors.
7. It could have more gold in it now.
8. This means the percent of desired mineral being mined.
26. Nonmetallic elements are more likely to loose electrons.
27. This indicates that noble gasses are nonreactive and very stable.
28. a. cation, b. cation, c. anion, d. anion, e. anion, f. cation, g. cation, h. anion
29. A. Copper metal and copper(II) are more similar because the only difference between them are electrons.
30. The diameter would be 206 pm.
31.
- a. Change in color
- Chemical: rusting
- Physical: paint
- b. Change in temperature
- Chemical: burning
- Physical: boiling
- c. Formation of a gas
- Chemical: reaction of 2 elements
- Physical: evaporation
- a. Bromine
- b. Silicon
34. Argon and potassium would be in different places if the periodic table was organized by atomic weight as well as cobalt and nickel.
#1-8 (p. 151)
1.
- Atmosphere: nitrogen and oxygen
- Hydrosphere: water and dissolved minerals
- Lithosphere: petroleum and metal-bearing ores
The mantle: 40-2900km: the middle layer of the lithosphere.
The core: 2900km: Earth's center: extremely hot.
b. The crust serves as the main storehouse of chemical resources used in manufacturing consumer products. 3.
a. Mexico.
b. Japan.
c. China. 4. China produces the largest masses of the eight listed resources in the table.
5. Minerals are naturally occurring solid compounds that have the element while ores must be mined.
6. Percent of metal in the ore, type of mining and processing used to extract the metal from the ore, and the environmental impact of the mining and metal processing are all factors.
7. It could have more gold in it now.
8. This means the percent of desired mineral being mined.
Blog Question
I know that the periodic the periodic table is made up of elements that are organized based on their atomic numbers. The number on the top right of the element is called the Atomic Number. The element symbol is the letter(s) in the middle of the element box on the table. The Atomic mass is at the bottom of the element box. The table consists of groups and periods.The color of the atomic number shows if an element is a liquid, gas, solid, or unknown. Groups run vertically while Rows, or periods, go from left to right. Elements that have similar properties are in groups.
Tuesday, July 9, 2013
Homework #2
#13-25 (p.130)
13. a. row= period b. column= groups
14. sodium (Na) and potassium (K)
15. a. Noble gasses are located in the group all of the way to the right, b. they are monatomic, c. they don't form compounds
16. a. MgF2 b. GaP2
17. The melting point would be around 70 degrees C
18. I would expect it to be lower.
19.
20.
13. a. row= period b. column= groups
14. sodium (Na) and potassium (K)
15. a. Noble gasses are located in the group all of the way to the right, b. they are monatomic, c. they don't form compounds
16. a. MgF2 b. GaP2
17. The melting point would be around 70 degrees C
18. I would expect it to be lower.
19.
|
Element Symbol
|
Number of Protons
|
Number of Neutrons
|
Number of Electrons
|
|
C
|
6
|
6
|
6
|
|
C
|
6
|
7
|
6
|
|
Ca
|
20
|
21
|
20
|
|
Pt
|
76
|
117
|
78
|
|
U
|
92
|
146
|
92
|
a. berylium: 4 protons, 4 neutrons, 4 electrons.
b. nitrogen: 7 protons, 7 neutrons, 7 electrons.
c. neon: 10 protons, 10 neutrons, 10 electrons.
21. A lead atom must have lost two electrons.
22. a. Carbon: 12, Calcium: 41, Platinum: 195, Uranium: 238 b. Carbon has two isotopes
23. No this is not sufficient because atomic numbers deal with a total rather than specifics on an element.
24. Electrons are much lighter than protons and neutrons.
25.
Mg-24
|
24
|
12
|
12
|
Mg-25
|
25
|
12
|
13
|
Mg-26
|
26
|
12
|
14
|
Subscribe to:
Posts (Atom)