Chemistry quiz 1: win up to 6 steem! :)
As weekend is about to start very soon, you may feel freed from the burden of your daily job and full of energy. This might be the right moment to try to solve my little chemistry quiz below and at the same time having the opportunity to win up to 6 steem. :-)
Rules - what are the requirements to win the prize?
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You have to upvote this article with at least 20 % of your voting power (no 1 % votes please :).
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Winner is the person who is the first one to post the correct solution (correct number and correct unit). The prize for the correct answer are 5 steem. I will send it to the winner immediately after I received the rewards for this article.
- If the winner had also resteemed my article, he will receive one additional steem (altogether (5 + 1) steem = 6 steem).
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If nobody finds the solution until Wednesday, April 12th, 2017 at 10 pm (German time!) the prize (5 steem) will be added to the next competition.
Calcium crystals:
Von Alexander C. Wimmer, CC BY-SA 3.0 at, https://commons.wikimedia.org/w/index.php?curid=17611906
Challenge to solve:
Assumed you have a certain number of calcium atoms 20Ca, where the sum of the electrical charges of the Ca-nuclei is Q = 3.8589 ∙ 106 C.
One single 20Ca atom has a mass of 40 u (please use this rounded number for your calculations).
1 g = 6.022 ∙ 1023 u.
The elementary charge of one proton is e = 1.602 ∙ 10-19 C.
Question: what is the overall mass (the sum of the masses) of all 20Ca atoms in g?
m(overall-20Ca) = ?
Remark: this is the first time I offer a challenge. I tried to make both the rules and the question clear enough. However I really appreciate your feedback in case something is not clear or any necessary information about the rules is missing. I also would like to hear your opinion about the question which I asked you to solve: Do you like these kind of quizzes? Was it too difficult or too easy? Should I offer another competition in future? Thanks in advance for sharing your view! :)
Congrats again @crazygrape , your prize has just been sent! :)
Approximately 80 g (80.00004975 without sig figs taken into account), assuming I calculated everything correctly.
Edit: My notes, in case anyone was interested
Congrats @crazygrape you are the winner of this round! Well done! :)
I just saw that you are still rather new to steemit - nice start! :-)
You were really fast - did you like the quiz? Maybe it was too easy ... ?
I will send you the 6 steem after the payout period of this article, as stated in the rules, alright?
Thank you.
The quiz was a bit easy for me, but I've had quite a bit of experience with this sort of problem solving from some of the classes I've taken in high school. I very much enjoy these sorts of things, so it didn't take long even though it's been a while since I've been in school.
I've read the rules before starting, but thank you for verifying.
You know, I would send it more early, but at the moment I have nearly no steem in my wallet. :)
Actually I wonder if I should offer more of these quizzes in future ... still pondering ... maybe I wait until the reward pool is full again, so that I can better afford it, because then my reward will at least be equal to the prize of the quiz. :-)
Nice quiz, not too easy, not too difficult!
Congratulations to @crazygrape.
No chance of me participating anyway since I'm not Chem person but here to support.
Thank you for posting @jaki01.
It is really great to see this sort of quiz at Steemit...it may take a few posts for it to catch on...and on a certain night as you have done.
The same goes for the Chess problems.
bleujay is happy to contribute to the reward.
All the best to you and your family. Cheers.
Thanks for your elaborated and very friendly reply! :)
It is not easy to find a suitable level for a quiz: too difficult is discouraging, but too easy is also bad, because it is somewhat boring for the other readers if someone has already solved the problem after only five minutes ...
All true.....and really do not have any suggestions...except to keep looking for something of that nature. it is a real boon to Steemit's image...Keeping it on the up and up.....and having something of more substance for the life long student.
Do you know of Quizlet? It may spark some ideas.
Keep up the good work. Greetings to the family.
Thank you for your reply @jaki01.
Oh yes...always better if it comes from the author.
Yes...thought your reward amount a good one....and again offer to make a contribution...to assist. There are others to be sure who would be delighted to contribute.
It is a lovely idea for Steemit.
Heres to Maths/Chess for Steemians. Cheers.
Great quiz, @jaki01. I think it's pretty hard to create a quiz that is too hard for the Steemit community. There are too many smart people hanging around. ;-)
Haha, indeed there are many clever ones ... but in my opinion anyway it shouldn't be the aim to create something nearly "unsolvable". The problem is to find the right balance: the quiz shouldn't be too easy (then it's boring), but also not too difficult (at least for 98 % of the members), which is somewhat discouraging then ...
That's also true. Really difficult to find a balance here.
Excellent @jaki01
Thanks! :)
Welcome ^_^