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allochka39001 [22]
3 years ago
14

I'm kinda in a rush but take your time!Thx! 1.What was Henri Becquerel studying when he accidentally discovered radioactivity?

Chemistry
1 answer:
zzz [600]3 years ago
4 0
1.C
2.B
3.B
4.D
Are the answers I got
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How many moles are in 153 grams of O2?
Tatiana [17]

Answer:

4.78 mol O2

Explanation:

Grams --> moles

Grams/molar mass = moles

153 g O2 / 32 g/mol O2 = 4.78125 (significant figures so round it up; the grams has 3 significant figures, so round it up) 4.78 mol O2

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Write on the blanks the number of significant figures each number has.
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Explanation:

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Chemical energy  is the kind of energy stored in the bonds formed by atoms and molecules in chemical compounds and elements.  This energy is  released during a chemical  reaction and  heat is often given out in the process. These kind of reactions where heat is given out as a by product are called exothermic reactions.

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Push your palms again a wall. What happened
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Why do you ask??

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