![subject](/tpl/images/cats/himiya.png)
![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 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)
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 22:30
Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?
Answers: 3
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 04:10
An unknown substance has been shown to have weak covalent bonds. which of the following is most likely a property of this substance? a. high ph b. high conductivity c. low melting point d. low flammability
Answers: 3
You know the right answer?
Calculate the pH of a solution prepared by dissolving 0.147 moles of acetic acid and 0.405 moles of...
Questions
![question](/tpl/images/cats/en.png)
English, 19.11.2020 14:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/informatica.png)
Computers and Technology, 19.11.2020 14:00
![question](/tpl/images/cats/en.png)
English, 19.11.2020 14:00
![question](/tpl/images/cats/himiya.png)
Chemistry, 19.11.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 19.11.2020 14:00
![question](/tpl/images/cats/biologiya.png)
Biology, 19.11.2020 14:00
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/es.png)
Spanish, 19.11.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 19.11.2020 14:00
![question](/tpl/images/cats/istoriya.png)
History, 19.11.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 19.11.2020 14:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 19.11.2020 14:00
![question](/tpl/images/cats/istoriya.png)
History, 19.11.2020 14:00