![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 10:30
Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?
Answers: 3
![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 17:00
Complete each row of the table below by filling in the missing prefix or missing exponent.
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 21:00
How many neutrons does an element have if its atomic number is 50 and its mass number is 166
Answers: 1
You know the right answer?
How do laboratory tools improve the observations made by a scientist?...
Questions
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/es.png)
Spanish, 22.10.2019 16:50
![question](/tpl/images/cats/mat.png)
Mathematics, 22.10.2019 16:50
![question](/tpl/images/cats/mat.png)
Mathematics, 22.10.2019 16:50
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/fr.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 22.10.2019 16:50
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/fr.png)
![question](/tpl/images/cats/informatica.png)
Computers and Technology, 22.10.2019 16:50
![question](/tpl/images/cats/mat.png)
Mathematics, 22.10.2019 16:50
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.10.2019 16:50
![question](/tpl/images/cats/User.png)
Engineering, 22.10.2019 16:50
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 22.10.2019 16:50
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/User.png)
Engineering, 22.10.2019 16:50