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Taya2010 [7]
2 years ago
7

After 4 half-lives 10 grams of uranium remains. How much uranium did you start with?

Chemistry
1 answer:
Free_Kalibri [48]2 years ago
4 0

Answer:

i think 40 grams

Explanation:

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10 points
puteri [66]

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Which of the following measurements is expressed to three significant figures? 7.30 × 10–7 km 0.007 m 7077 mg 0.070 mm
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7.30 x 10^-7 km. the others have 4 significant figures.

4 0
2 years ago
7. If you constructed graphs, what trends do they indicate in your data?
lisabon 2012 [21]
A tend line I believe (I am going off the other guy cause they are right.)
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How many atoms are represented in 28 grand of sodium
Nady [450]
The molar mass of sodium is 22.99 ㅤ ㅤ ㅤ 22.99 (28) = 643.72 mol now multiply by avogrados number to find the number of atoms. ㅤ ㅤ ㅤ 643.72 (6.022 x 10^23) = 3.88 x 10^26 number of atoms
8 0
3 years ago
Which of these is the ionic compound?
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RbF

mgo

nh4cl

because electrons are lost by and element forming a cation and gained by the other element forming an anion and held together by electrostatic forces

5 0
2 years ago
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