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m_a_m_a [10]
3 years ago
5

Are there moles of stars in the universe?

Chemistry
1 answer:
Natalka [10]3 years ago
7 0

Answer:

Yes, a mole is defined as 6x1023 of something, so a mole of stars is 6x1023 stars. If we compare this number to our estimate of the total number of stars, we find that there is about 1/10 of a mole of stars in the Universe.

Hope this helps!

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What SI Unit would best be used to express the height of your classroom ceiling?
ivolga24 [154]

SI unit of length - meters
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3 years ago
Convert each into decimal form. a) 1.056 x 10-3 b) 0.560 x 102​
FinnZ [79.3K]

Answer:

A. 7.56

b. 57.12

Explanation:

Hope that's right have a nice day :)

6 0
3 years ago
Which of the following is the best example of potential energy?
strojnjashka [21]
Answer :

A car stopped at the top of a hill

Explanation :

Definition of potential energy : energy stored that depends upon the relative position of various parts of a system
5 0
3 years ago
How many uL are present in 250 mL of H20? (1 uL = 10^-6 Liters)​
Vanyuwa [196]

Answer:

250000 μL

Explanation:

If         1 L = 1000 mL

Then  X L = 250 mL

X = (1 × 250) / 1000 = 0.25 L

Now we can calculate the number of microliters (μL) in 0.25 L:

if        1 μL = 10⁻⁶ L

then   X μL = 0.25 L

X = (1 × 0.25) / 10⁻⁶  =250000 μL

4 0
3 years ago
The following questions are about ethyl bromide,n-propyl bromide, isopropyl bromide,t-butyl bromide, & neopentyl bromide
mrs_skeptik [129]

Answer:

a) Watch the attaccment

b) Ethyl bromide is more reactive than n-propyl bromid, and this more than neopentyl bromide. Ethyl bromide has less steric hindrance than the others, to SN2 reactions.

c) t-butyl bromide is more reactive than  isopropyl bromide, and this more than ethyl bromide. t-butyl bromide structure stabilize the carbocation, better than the others.

Explanation:

Speed of SN2 reactions depends on steric hindrance, the less hindrance, the most reaction speed, meaning more reactivity. Then, those linear structures are more reactive to SN2 reactions.

In the other hand, speed of SN1 reactions depends on the stability of the carbocation formed. Structure with ramifications can stabilize better the carbocation, these structures are more reactive to SN1 reactions.

Download pdf
7 0
3 years ago
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