4. Death Valley recently hit 130. degrees F, what is the temperature

4. Death Valley recently hit 130. degrees F, what is the temperature in degrees C?

5. What is the MW of metformin C4H11N5? Calculate MW to the hundredth of a gram.

2. How many seconds are in a millennium, 1,000 standard years? (1 year = 365 days)

3. A 220 lb. body builder is 6.0 feet tall, what is their BMI? (kg/m^2)

6. A sample of a gold alloy with dimensions 12.5 mm x 40.0 mm x 60.0 mm weighs 579 g. What is the density of the alloy in g/cm^3? Make sure to show all conversion steps

7. What is the density of C3H8 at STP (Standard Temperature and Pressure) in g/cm^3

9. For N2 + 3 H2 → 2 NH3 – 25.0 mol of nitrogen gas produces how many g of ammonia?

10. For CH4 + 2 O2 → CO2 + 2 H2O for 100. g of CH4, calculate the mass (g) of all product

11. 357 g KBr is dissolved in 1,500. ml of solution, what is molarity, osmolarity, and w/v

12. What is the glucose concentration (M) if 75.0 ml of 4.0 M glucose is diluted to 600.0 ml? 13. Titration: 15.0 ml 0.100 M NaOH neutralizes 20.0 ml H3C6H5O7 What is M of the citric acid solution? Use M1V1X1 = M2V2X2 to crosscheck the molarity (M). Make sure to balance the equation and use the full factor label calculation.(Needs to be crosscheck)

17. A 4.00 g sample of gas occupies a volume of 2.00 L at 2.50 ATM pressure at 244 °K. What is the MW of the gas? For bragging rights, what could the gas be?

14. 1.25 g of NaCl is mixed with 1.25 g of sand, and separated using selective solubility, as we did in the lab. If 1.00 g of NaCl was recovered, what is the percent recovery of NaCl?

15. 150. g of C8H18 is combined with O2 using the balanced equation below. At 100% yield, calculate the grams of CO2 and H2O produced, and the amount of oxygen needed for full conversion of octane to carbon dioxide and water. Show conservation of mass (R P). 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O C = 12.01 amu H = 1.01 amu O = 16.00 amu

16. pH and pOH – Find the pH, pOH, [H+], and [OH-] for 0.0025 M HCl, and 0.0050 M NaOH

A radioactive isotope has a half-life of 7.5 hours. How much is left (%) at the end of exactly 2.5 days. Show both your logic and math in calculating the result

8. Balance combination, decomposition, SD, DD and combustion reactions (see back)

. Balance each chemical equation, include states of matter, and name each type of reaction Al (s) + HCl (aq) aluminum chloride (AlClx) and hydrogen gas (H2) H2O (l) + CO2 (g) carbonic acid NaN3 (s) sodium metal (Na) and nitrogen gas (N2) NaOH (aq) + H3PO4 (aq) sodium phosphate and water C3H8 (g) + O2 (g) carbon dioxide and water

13. Titration: 15.0 ml 0.100 M NaOH neutralizes 20.0 ml H3C6H5O7 What is M of the citric acid solution? Use M1V1X1 = M2V2X2 to crosscheck the molarity (M). Make sure to balance the equation and use the full factor label calculation method as we did in lab

R = 0.0821 L*ATM/mol*K