General Chemistry 1 Take Home Quiz 1 Test Questions Help

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Take-Home-Quiz 1 (Review Test 1) – General Chemistry I 1. Aluminum metal melts at 660.37 °C. What is the temperature in Kelvin and in Fahrenheit? 2. Gallium is a metal that can melt in your hand at 302.93 K. What is the temperature in C and in Fahrenheit? 3. 317 grams of sugar occupies a volume of 0.200 L. What is the density of the sugar in g/mL? 4. The solubility of potassium nitrate is 38g/ 100g H2O at 20 ºC and 1.50 x 102 g/ 100g H2O at 70 ºC. A solution is prepared by mixing 24g of potassium nitrate in 18g of water at 70 ºC. a) will all the potassium nitrate dissolve at 70 ºC? b) the solution is cooled to 20 ºC. Does all the potassium nitrate remain in solution at this temperature? c) if it doesn't, how much potassium nitrate crystallizes out? 5. How many protons, neutrons electrons are there in K, K+, Fe, Fe+2, and Fe+3? 6. Calculate the molarity of the following solutions a) 20.8 g of sodium hydroxide is dissolved in water to make 500 mL of solution. b) 45.2 g potassium bromide is dissolved in water to make 320 mL of solution 7. Iron consists of four isotopes whose atomic masses and abundances are as follows: Iron-54 → 53.94 amu, 5.9%; Iron-56 → 55.93 amu, 91.72%; Iron-57 → 56.94 amu, 2.10%; Iron-58 → 57.93 amu,0.280%. Calculate the average atomic mass of Fe. 8. Calculated the average atomic mass of Si. 28 Si → 27.98 amu, (92.2); 29Si → 28.98 (4.7%); 30Si → 29.97 (3.1%) 9. How many grams are there in 1 atom of Na? 10. How many atoms are there in 2.574 g de C. 11. A compound is analyzed and found to contain 64.80% carbon, 13.62% hydrogen, and 21.58% oxygen. What is the simplest formula? The molar mass is 148 g/mol. What is the molecular formula? 12. The percentage composition of acetic acid is found to be 39.9% C, 6.7% H, and 53.4% O. Determine the empirical formula of acetic acid. 13. Balance the following equations: a) C3H6O + O2 → CO2 + H2O b) C5H10O + O2 → CO2 + H2O c) NaOH + H2SO4 → Na2SO4 + H2O d) H2O2 → H2O + O2 14. When 4.00 g of NH3 reacts, the actual yield of N2 is 6.00 g. What is the percent yield? NH3(g) + NO(g) → N2(g) + H2O(l) 15 Neutralization is a type of chemical reaction in which an acid and base react with each other to form water and a salt. Calculate the %yield of a reaction that combined 22 grams of sodium hydroxide with 30 grams of sulfuric acid that produced 25 g of Na2SO4. 16 Name the following compounds a) PBr3 b) SF6 c) H2SO4 e) BrO3 f) FeCl3 d) H2SO3

Tutor Answer

DENIQUE
School: UIUC

see it.

SURNAME 1

General Chemistry
Institutional Affiliation
Instructor
Date

TAKE-HOME-QUIZ 1 (REVIEW TEST 1) – GENERAL CHEMISTRY I
1. Aluminum metal melts at 660.37 °C. What is the temperature in Kelvin and in Fahrenheit?
0°C= 273.15 K
660.37°C=?
273.15+660.37= 933.52 kelvin

0 °C = 32 °F
The temperature T in degrees Fahrenheit (°F) is equal to the temperature T in degrees Celsius (°C)
times 9/5 plus 32
T(°F) = 660.37°C × 9/5 + 32 = 1220.67°F

2. Gallium is a metal that can melt in your hand at 302.93 K. What is the temperature in C and in Fahrenheit?
0°C= 273.15 K
302.93-273.15= 29.78°C

SURNAME 2

T(°F) = T(K) × 9/5 - 459.67
T(°F) = 302.93K × 9/5 - 459.67 = 85.61 °F

3. 317 grams of sugar occupies a volume of 0.200 L. What is the density of the sugar in g/mL?
Density = (mass/volume)
Mass= 317g
Volume= 0.200L but 1L= 1000 mL
0.200*1000= 200ml
D= 317/200= 1.59g/mL

4. The solubility of potassium nitrate is 38g/ 100g H2O at 20 ºC and 1.50 x 102 g/ 100g H2O at 70 ºC. A
solution is prepared by mixing 24g of potassium nitrate in 18g of water at 70 ºC.
a) Will all the potassium nitrate dissolve at 70 ºC?

If 150 g/100 g H2O = then = 1.5 gKNO3 / 1 g H2O
So;
18 g of water @ 1.5 gKNO3 / 1 g H2O = only 27 g KNO3 can dissolve in 18 g H2O @ 70 C
Therefore, if 27g can dissolve, all 24g can also dissolve at 70 ºC
This means 27-24= 3g more of solute can b...

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