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Nata [24]
3 years ago
11

______ fragmented into the continents we see on Earth today.

Chemistry
1 answer:
lara31 [8.8K]3 years ago
7 0
Pangea. :) Hope it helped!
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When NH3(aq) is added to Cu2 (aq), a precipitate initially forms. Its formula is:
Rasek [7]
It’s B the cu looses its 2 and passes it to the NH3 that needs a bracket to separate them. The NH3 doesn’t loose its 3 because it’s already a compound!
Hope this helps!
3 0
3 years ago
Why is blue so rare in nature?​
vladimir1956 [14]

Answer:

Explanation:

For a flower to appear blue, "it needs to be able to produce a molecule that can absorb very small amounts of energy," in order to absorb the red part of the spectrum, Kupferschmidt said.

7 0
2 years ago
Read 2 more answers
A wheelbarrow can be used to help lift a load, such as a pile of dirt, and then push the load across a distance.
mrs_skeptik [129]

Answer: it consists of two simple machines: a lever and a wheel and axle. Effort is applied to the lever by picking up the handles of the wheelbarrow.

Explanation:

4 0
2 years ago
Codeine C18H21NO3 is a weak organic base. A 5.0 x 10^-3 M solution of codeine has a pH of 9.95. Calculate the value of Kb for th
arsen [322]

Answer:

Kb = 4.45\times10^{-7}\ mol/L

p^{Kb}=6.35

Explanation:

For a weak organic base, the formula to find p^{OH} is given by:

p^{OH}=p^{K_b}+\log c

where c is the concentration of base.

Here c= 5\times10^{-3}\ M

p^{H}=9.95\\p^{OH}=14-p^{H}=14-9.95=4.05

Substituting the above values in the formula,we get:

p^{k_b}=p^{OH}-\log c\\p^{k_b}=4.05-\log (5\times10^{-3})\\p^{K_b}=6.35\\K_b=$antilog 6.35=4.45\times10^{-7}\ mol/L

Hence:

Kb = 4.45\times10^{-7}\ mol/L

p^{Kb}=6.35

7 0
3 years ago
What is the density of a 805 g sample of pure silicon with a volume of 2.3 cm3?
MAVERICK [17]
The density of it would be 57. Do the math and apply the formula to it and you would get this answer.
3 0
3 years ago
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