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Elis [28]
3 years ago
10

Which of the following is NOT an example of a chemical change? *

Chemistry
1 answer:
lord [1]3 years ago
4 0
Grinding as it’s a physical not chemical change :)
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The half-life of a strontium isotope is 25 years. How much of this particular isotope will remain after 100 years if the startin
Phoenix [80]

Answer:

1 gram

Explanation:

Half life = 25 years

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Time = 100 years

Number of half lives = Time / Duration of Half life = 100 / 25 = 4

After first Half life;

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After Second Half life;

Remaining mass = 8 / 2 =  4 g

After Third Half life;

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After Fourth Half life;

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3 0
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The atomic weight of boron is reported as 10.81, yet no atom of boron has the mass of 10.81 amu. explain
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<span>Boron has a lot of different isotopes, most of which having a very short half life (ranging from 770 milliseconds for Boron-8 down to 150 yoctoseconds for boron-7). But the two isotopes Boron-10 and Boron-11 are stable with about 80.1% of the naturally occurring boron being boron-11 and the remaining 19.9% being boron-10. The weighted average weight of those 2 isotopes has the value of 10.81. The reason they use the average mass of an element for it's atomic weight is because elements in nature are rarely single isotopes. The weighted average allows us to easily compare relative number of atoms of one element against relative numbers of atoms of another element assuming that the experimenters are getting isotope ratios close to their natural ratios.</span>
7 0
3 years ago
Which two equations represent double-replacement reactions?
enyata [817]

Answer: A and D, I believe

Explanation:

8 0
2 years ago
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What's the chemistry definition of density
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Density<span> is </span>defined<span> as the ratio between mass and volume or mass per unit volume. 
Source is google

</span>
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3 years ago
What is the element found in Group 17 Period 4?​
faust18 [17]

Answer:

Bromine is found in Group 17, Period 4 on the periodic table.

3 0
2 years ago
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