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

Answers: 1

Show answers

Another question on Chemistry

Chemistry, 22.06.2019 10:00

The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90

Answers: 1

Answer

Chemistry, 22.06.2019 10:30

What woukd most likely be the transmittance at a 0.70 m solution of solute a? a) 7.6%b) 1.1%c)4.0%d)4.6%

Answers: 1

Answer

Chemistry, 22.06.2019 22:30

Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?

Answers: 1

Answer

Chemistry, 23.06.2019 00:00

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.

Answers: 1

Answer

You know the right answer?

I'm kinda in a rush but take your time! thx! 1.what was henri becquerel studying when he accidental...

Questions