Which are true statements about reactions? check all that apply.
a. in a chemical reaction, t...
Chemistry, 25.09.2019 11:30, iicekingmann
Which are true statements about reactions? check all that apply.
a. in a chemical reaction, the nucleus is breaking apart.
b. in a chemical reaction, bonds between atoms break apart.
c. in a chemical reaction, electrons are given, taken, or shared.
d. chemical reactions produce much more energy than nuclear reactions.
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
Chemistry, 23.06.2019 06:50, summerjoiner
What is the volume of 3.2 moles of chlorine gas (cl2) at 295 k and 1.1 atm?
Answers: 1
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