Which groups on the periodic table represent the s- block ?
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Chemistry, 03.11.2020 19:40, kyrabrown33
Which groups on the periodic table represent the s- block ?
Answers: 1
Chemistry, 22.06.2019 09:00, Ezekielcassese
What is the percentage composition of carbon in the compound ch4
Answers: 1
Chemistry, 22.06.2019 10:30, angemango3423
What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5
Answers: 1
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
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