![ansver](/tpl/images/cats/User.png)
Answers: 1
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 09:30
In 2002, the rare earth elements mine in mountain pass, california was closed because
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 10:10
Stage in which a typical star has completely stopped fusion
Answers: 1
![question](/tpl/images/cats/himiya.png)
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
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 19:00
Which statement best describes what happens when molecular compounds melt
Answers: 1
You know the right answer?
Determine the mass of 840 cm3 of oxygen gas, O2 at rtp...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 08.04.2020 22:26
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 08.04.2020 22:26
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 08.04.2020 22:26
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/pravo.png)
Law, 08.04.2020 22:26
![question](/tpl/images/cats/istoriya.png)
History, 08.04.2020 22:26
![question](/tpl/images/cats/geografiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 08.04.2020 22:27
![question](/tpl/images/cats/mat.png)
Mathematics, 08.04.2020 22:27