A catalyst can only be used once.
True
False...
![ansver](/tpl/images/cats/User.png)
Answers: 1
Another question on Chemistry
![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 18:00
Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?
Answers: 2
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 04:00
Which method would be best to separate a mixture of sand and gravel
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 05:00
How many atomic mass units are equal to 1.672×10−24 g of protons?
Answers: 3
You know the right answer?
Questions
![question](/tpl/images/cats/en.png)
English, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/en.png)
English, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.03.2021 20:10
![question](/tpl/images/cats/istoriya.png)
History, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 23.03.2021 20:10