Chemistry, 16.09.2019 07:00 Playboycxm

I'm kinda in a rush but take your time! thx! 1.what was henri becquerel studying when he accidentally discovered radioactivity?
a. photography b. properties of black light c. properties of x-rays d. solar energy 2.when marie curie isolated uranium from pitchblende, she realized that the pitchblende was more radioactive than the uranium she had extracted. what did she conclude about her observations?
a. pitchblende itself is a radioactive element b. the pitchblende sample contained an unknown radioactive element
c. the pitchblende sample was defective d. pitchblende should be used as radiation therapy 3.henri becquerel's original hypothesis was that fluorescent minerals became excited by a solar energy and gave off x-rays. however, after he discovered uranium minerals emitted their own radiation without the of solar energy, he abandoned his hypothesis. why did becquerel abandon his first hypothesis?
a. he was afraid of ridicule from the scientific community for being wrong
b. he found new evidence that didn't support his original hypothesis
c. he couldn't repeat the results in multiple experiments.
d. he couldn't make the experiment work, so he came up with a new plan
4.marie curie had many "firsts". which of the following is not one of marie curie's firsts?
a. first female nobel prize winner b. first female professor in the faculty of sciences
c. first to suggest that atoms can change d. first to discover x-rays my answers: 1.d 2.b 3.a 4.d

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