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Chemistry, 22.06.2019 03:50
Express the following number in scientific notation. 0.026890 =
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) ā h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 Ā°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, 23.06.2019 01:30
The solubility of barium nitrate is 9.02 g/100 g h2o at 20Ā°c. a 15.2 g sample of barium nitrate is added to 200.0 g of water at 20Ā°c. is the solution saturated, unsaturated, or supersaturated? a. unsaturated b. saturated c. supersaturated
Answers: 1
Chemistry, 23.06.2019 03:30
Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8Ć10^-5
Answers: 1
Name two products that are made using sodium hydroxide....
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