Chemistry questions
English
Intermediate
30
Questions
1 min
Per question
7:16
Average time
4.0
Contest Score
1.5
Community Rating
21
Participants
7 comments
Smart Tiger judge
1. Basic Explanations. Explanations expand the correct answer.
Giant Elk judge
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Educational explanations. 👍 Explanations cover why the correct answers are correct and why the wrong answers are wrong (when appropriate). E.g.: #q1, #q2, #q30
Hardy Swan
Are you serious?? Many of the explanations simply repeat the correct answers or expand the correct answers! Some of them sound even not related to the explanation of the answer! There are very few explanations clearly explaining why the correct answers are correct! And there are very indistinct and few explanations of the wrong answers! Why are you lying??? And there are also a lot of English mistakes! I'm pretty sure that you do not know anything about chemistry! Or you know the owner! You have to be fair! Why are you even a judge if you cannot simply be fair??
Sweet Goose
29. Which of the following changes is not the characteristics of chemical change?
– New substance is formed
– Alters composition of substances
– Energy is absorbed or released
– Easily reversed
There are some chemical changes which are easily reversed. For example: Nh3+ HCl is easily reversed reaction.
Sweet Goose
14. Which of the following is the correct increasing order of the atomic size of the elements Mg, B, K, Cl, and C? (Z, Mg = 12, B = 5, L = 6, K = 19, Cl = 17). Here is a typo. Instead of L should be C
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