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3 years ago

Rutherford used a gold foil experiment and discovered what part of an atom

1 answer:

7 0

Hihi!

During Rutherford's experiment of shooting particles through a sheet of gold foil he had discovered that some were deflected! This had proved that an atom is actually a small dense nucleus surrounded by orbiting electrons!

I hope I helped!
-Loliarual

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The pKa of the α‑carboxyl group of serine is 2.21 , and the pKa of its α‑amino group is 9.15 . Calculate the average net charge

sleet_krkn [62]

Answer:

Net charge in serine at pH equal to 8.30 is "0"

Explanation:

At pH > $pK_{a}$ , carboxyl group exists as $-CO_{2}^{-}$ (charged)

At pH < $pK_{a}$ , carboxyl group exists as -COOH (neutral)
At pH > $pK_{a}$ , amino group exists as $-NH_{2}$ (neutral)
At pH < $pK_{a}$ , amino group exists as $-NH_{3}^{+}$ (charged)
So, at pH = 8.30, both carboxyl and amino group exists in charged state.
Net charge in serine at pH equal to 8.30 is "0".
Structure of serine at pH equal to 8.30 has been shown below.

8 0

3 years ago

Is the continental crust less dense or more dense ?

zheka24 [161]

Answer:

It is less dense. It is also less dense than the oceanic crust.

Hope this helps and if it did, please mark brainliest!

4 0

3 years ago

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5 points What is the name of the atom pictured here? Use a periodic table if needed. *

photoshop1234 [79]

Answer:

There is nothing attached to this question so I unfortunately cannot help you

Explanation:

3 0

3 years ago

If 30 ml of water containing 15 mg of salicylate is extracted with 30 ml of chloroform, 2.59 mg of salicylate remains in the wat

In-s [12.5K]

Answer:

Distribution coefficient: 4.79

Explanation:

Distribution coefficient is the ratio between equilibrium concentration of non-aqueous phase and aqueous phase where both solvents are inmiscible. The equation for the problem is:

Distribution coefficient: Concentration in chloroform / Concentration in Water

Concentration in water: 2.59mg / 30mL = 0.08633mg/mL

Concentration in chloroform: (15mg-2.59mg) / 30mL = 0.4137mg/mL

Distribution coefficient: 0.4137mg/mL / 0.08633mg/mL

<h3>Distribution coefficient: 4.79</h3>

8 0

2 years ago

How does a tree get energy?

Snezhnost [94]

Your answer is B. It gets energy from the Sun.
Have a great day :)

6 0

2 years ago

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