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22 Cards in this Set
- Front
- Back
A yellow flame indicates too _____ oxygen. |
Little |
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You make the following measurement on a metal cylinder: d=1.25 cm; l=3.61 cm. The mass of the cylinder is 7.42g. Calculate the density. |
(7.42g) __________________________=4.43cm^3 (Pi ((1.25cm/2)^2)3.61cm) |
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How did you determine the volume of the glass beads? |
Geometric Measurement and Volume Displacement |
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What is specific heat? |
amount of heat necessary to raise the temperature of one gram of a substance by one degree celcius. |
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Suppose you heat 6.3g of an unknown metal block to 100 degrees celcius and then drop the metal into a calorimeter containing 50.0g of H2O at 19.0 degrees celcius. Assume that there is no heat lost to the calorimeter. The final temperature of the water in the calorimeter and the metal bloack is 26.6 degrees celcius. Calculate the specific heat of the metal. |
[-(50.0g)(4.18J/gs)(26C*-19C*)] _______________________________ =3.443J/gc [(6.3g)26.6C*-100C*)] |
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Mg metal is added to a solution of hydrochloric acid. Colorless bubbles are given off. Write a balanced molecular equation and convert it a net ionic equation. |
Mf(s) + 2HCl2(aq)>>>> MgCl2(aq)+H2(g) Mg(s)+H(aq)>>>>Mg2(aq)+H2(g) |
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Write down the copper cycle |
Cu(s){bronze}>>>>Cu(NO3)2(aq){green}>>>>Cu(OH)2(s){blue}>>>>Cu(s){black}>>>>CuSO4(aq){blue} |
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Which products in the pathway are solids and which are solutions? |
Solids: (Cu,Cu(OH)2, CuO) Solutions: (Cu(NO3)2, CuSO4) |
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What reagents are needed to go from step to step? |
Nitric acid, Sodium Hydroxide, Heat, Sulfric Acid, and water, Zinc and HCl |
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What poisonous gas was generated in the cycle? |
NO2 aka nitrogen oxide in step one |
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How much copper is contained in 100g of CuO |
100g CuO X (63.546gCu) ______________ =79.9g of Cu
(79.545gCuO) |
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What is the principal reaction? |
2Mg(s)+O2>>>>MgO(s) |
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Were there any other products formed other than MgO? |
Mg3N2 Mg(OH)2 H2O |
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Calculate the % Mg given the following data: weight of crucible, cover and lid=30.15g; weight of crucible, cover, lid and Mg=32.19g; weight of crucible, cover, lid and oxide=33.76g |
32.19-30.15=2.04gMg 33.76-30.15=3.61gMgO (2.04/3.61) X 100=56.5% |
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A mixture contains 15.0g KClO3 and 20.3g NaCl. What is the % KClO3 (by weight)? |
(15.0/35.3) X 100=42.49% KlCO3 |
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What is the reaction that describes the decomposition of KClO3? |
2KClO3>>>>2KCl+3O2 |
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How much O2 will be generated in mols beginning with 0.107mol KClO3? |
0.160 mol )2 X 32g)2/ 1mol)2 = 5.14gO2
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What is a hydrate? |
A compound that integrates intact H2 molecules into its crystal structure |
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Suppose you obtain 0.0166 mol for the amount of anhydrous salt and 0.1328mol for the amount of water. What is the formula of the hydrate (x)? |
(0.1328mol)/(0.0166mol)=8H2O |
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How many liters of 12.0M H2SO4 (aq) would it take to supply 0.155mol of H2SO4? |
12.0M/0.155mol=0.012916 L |
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The vapor pressure of water at 20.0C* is 17.5 torr. Suppose you collect 500 ml of an unknown gas over the water at 25.0C*, how many mols of has are ther in the flask? The barometric pressure is 760mmHg. |
n=(0.977 atm)(0.5L)/(0.0821)(293)=0.0203mol |
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Suppose a photon has an energy of 1.8 X 10^-19 J. What is its correspoinding frequency? |
V= 6.626 X 10^-34J-1.8 X 10^-19J=-1.8 X 10^-19 |