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iris [78.8K]
3 years ago
8

you have 30.0 grams of a chemical element. After a certian amount of time, you have 3.75 grams remaining. How many half lives ha

ve you gone through?ASAP PLEASE
Chemistry
1 answer:
Salsk061 [2.6K]3 years ago
5 0

Explanation:

The chemical elements goes from 30g to 15g to 7.5g to 3.75g.

Therefore, it has gone through 3 half lives.

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Color change, precipitation, bubbling

Explanation:

Chemical change changes the chemical composition and undergoes a process in which it results as a new substance.

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Given the formula of a compound:<br><br> (1) aldehyde<br> (2) alkene<br> (3) alkyne<br> (4) alcohol
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Number 3 alkyne is the answer

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3 years ago
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2. How will the equilibrium shift if the following changes are made? State if the reaction will shift
Kamila [148]

Please give me brainleist. :)

Answer:

2a. If the temperature is increased, the reaction will shift to the right in an attempt to release some of the heat. As the forward reaction loses heat while the reverse would create more heat.

2b. If the pressure is increased, it would shift to the left to counteract the increase in pressure as the left side will have fewer molecules.

2c. If Cl2 is added the reaction will shift to the left in order to remove the stress of the extra Cl2 and favor the production of more reactant.

2d. If PCl3 is removed, the reaction will shift to the right. When part of the equation is removed the reaction learns to adapt to the loss by trying to make more Pcl3 and counteract the effects of losing the PCl3.

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3b. It will shift to the left to get rid of the excess HCl being produced and form more reactant from the breakdown of the HCl.

3c. It would shift to the right in order to get rid of the excess form products from it.

3d. If pressure is decreased there will be no effect on the shift of the reaction because there is an even amount of moles of gas on each side.

4a. K=[N2O4(g0] / [NO2(g)]2

4b. (Below)

K=[N2O4(g)] / [NO2(g)]2

0.4 / 0.5(2)

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7 0
3 years ago
The sanlinity of ocean water
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Salinity is practically the saltiness of the water, in basic terms. It's basically the amount of salt dissolved in water. Ocean water has a salinity of around 35g/l (that's about 3.5% of which is dissolved salt in water!). However, Atlantic Ocean (the ocean with the saltiest water), can range up to 37g/l.

<em>Feel free to mark this as brainliest :D</em>

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