Chemistry, 30.06.2019 16:20 apreston2882
Which of the following are the least dense materials shown? rock- 1000g, 0.5l(liters) pillow- 200g, 10l(liters) bottle of soda- 2000g, 2l(liters) loaf of bread- 100g, 1l(liter) loaf of bread and rock? rock and bottle of soda? loaf of bread and pillow? bottle of soda and loaf of bread?
Answers: 2
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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, 23.06.2019 01:00
Chromium(iii) sulfate is a transition metal compound containing the metal chromium and the polyatomic ion sulfate. the oxidation state of chromium in this compound is , and the chemical formula of the compound is ( ) . reset next
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Which of the following are the least dense materials shown? rock- 1000g, 0.5l(liters) pillow- 200g,...
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