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Chemistry, 21.06.2019 22:30, kingteron5870
Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?
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Chemistry, 21.06.2019 22:30, johnnydenali67
Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know
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Chemistry, 22.06.2019 01:30, adrian08022
When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)
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Chemistry, 22.06.2019 11:40, Wemaybewrong
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
Determine the concentration of hydroxide ions if the molarity of hydrogen ions is 7.3x10-6....
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