Chemistry, 02.04.2021 02:40 paulawells11
How does the microplastic concentrations in stream samples compare with that for snow samples?
Answers: 1
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Chemistry, 22.06.2019 14:20
You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring
Answers: 1
Chemistry, 22.06.2019 21:40
A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?
Answers: 3
How does the microplastic concentrations in stream samples compare with that for snow samples?...
History, 30.07.2019 18:30
Mathematics, 30.07.2019 18:30
History, 30.07.2019 18:30
Mathematics, 30.07.2019 18:30
Mathematics, 30.07.2019 18:30
Mathematics, 30.07.2019 18:30
Health, 30.07.2019 18:30
Mathematics, 30.07.2019 18:30
Mathematics, 30.07.2019 18:30