CHEM 1451 - UTA - General Chemistry questions with answers

CHEM 1451 - UTA - General Chemistry|\ |\ |\ |\ |\ |\ |\




questions with answers |\ |\




Which of the following would most likely be the
|\ |\ |\ |\ |\ |\ |\ |\ |\



uncertainty (or the error) associated with the |\ |\ |\ |\ |\ |\ |\



measurement of 0.0980 g? |\ |\ |\




+/- 0.0010 g
|\ |\




+/- 0.0001 g
|\ |\




+/- 0.01 g|\ |\




+/- 0.0100 g
|\ |\




+/- 0.00001 g - CORRECT ANSWERS ✔✔+/- 0.0001 g
|\ |\ |\ |\ |\ |\ |\ |\




A patient has 25.0 mL of blood drawn and this volume of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



blood has a mass of 36.5 g. What is the specific gravity of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



the blood? (Assume that the density of water is 1.00
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



g/mL)
|\




6.85
0.146
36.5
0.685

, 1.46 - CORRECT ANSWERS ✔✔1.46
|\ |\ |\ |\




Express 21 ug (micrograms) in scientific notation without
|\ |\ |\ |\ |\ |\ |\ |\



using metric prefixes... |\ |\




2.1 * 10^-8 g |\ |\ |\




2.1 * 10^-5 g |\ |\ |\




0.21 * 10^-7 g |\ |\ |\




21 * 10^-7 g
|\ |\ |\




21 * 10^-5 g - CORRECT ANSWERS ✔✔2.1 * 10^-5 g
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\




An alloy contains 55 g of silver, 3 g of gold, and 22 g of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



copper. What is the percentage of silver in the alloy?
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



Round off your answer to the tenths place.
|\ |\ |\ |\ |\ |\ |\




82.1%
0.6%
55.0%
68.8%
73.6% - CORRECT ANSWERS ✔✔68.8% |\ |\ |\ |\




At 20C, if the mass of the unknown is 3.3 g and its volume
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



is 4.2 mL, what is the density of the unknown at 20C?
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\