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2 years ago

How many orbitals are there in the n = 4 level of the h-atom?

Chemistry

1 answer:

Nikolay [14]2 years ago

8 0

The H-atom has fourth energy level with n=4.

This energy level can have values of orbital angular momentum l = 0, 1, 2, 3

Now each l can also have magnetic momentum ml from – l to l.

Therefore,

l = 0

ml = 0

l = 1

ml = -1, 0, 1

l = 2

ml = -2, -1, 0, 1, 2

l = 3

ml = -3, -2, -1, 0, 1, 2, 3

Now adding up all the number of ml’s will give us the total number of orbitals:

orbitals = 1 + 3 + 5 + 7

orbitals = 16

Alternatively, we can simply use the formula:

orbitals = n^2 = 4^2 = 16

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The compound adrenaline contains 56.79% c, 6.56% h, 28.37% o, and 8.28% n by mass. what is the empirical formula for adrenaline?

Phoenix [80]

To determine the empirical formula of the compound given, we need to determine the ratio of each element in the compound. To do that we assume to have 100 grams sample of the compound with the given composition. Then, we calculate for the number of moles of each element. We do as follows:
mass moles
C 56.79 4.73
H 6.56 6.50
O 28.37 1.77
N 8.28 0.59

Dividing the number of moles of each element with the smallest value, we will have the empirical formula:

 moles ratio
C 4.73 / 0.59 8
H 6.50 / 0.59 11
O 1.77 / 0.59 3
N 0.59 / 0.59 1

The empirical formula would be C8H11O3N.

8 0

2 years ago

A composition of reflections over parallel lines is the same as a __________.

8090 [49]

Answer : Option A) Translation

Explanation : A composition of reflections over parallel lines is the same as a Translation.

To identify if the composition of reflections over parallel lines are same as translation or not?

We can check using a picture of some shape in the plane. Place the picture on the right side of two vertical parallel. Now, we can see the reflected the shape over the nearest parallel line, then check the reflection over the other parallel line. We see that the shape winds up in the same orientation, like it was just shifted over to the right. Hence, it is translation.

6 0

2 years ago

Read 2 more answers

2. This graph shows the energy involved in a reaction involving two molecules. Describe what is happening or what the state of t

blagie [28]

If you think of it endothermic is when there is energy needed for the reaction to occur and exothermic is when the reaction releases energy

6 0

2 years ago

What is the pH of a solution with a [H+] of 1.0 x 10-4 M?

MaRussiya [10]

PH = -log [H+]
pH = -log (1.0x10^-4) = -(-4) = 4 or A

4 0

2 years ago

3. At the end of a warm summer day, imagine you are jumping from the 80°F air into an

djyliett [7]

Answer:

1. Since the temperature of your body is higher than the temperature of the air and of the water, heat will flow from your body to the air and pool.

2. The pool feels cooler than air because the water can absorb heat energy faster than the air, due to liquids are better conductors than gases.

Explanation:

Heat always flows from warmer substances to colder ones.

The normal body temperature is 98ºF. Therefore, the heat will flow from your body to the air and pool, which are at a lower temperature of 80ºF. In both cases, you will lose thermal energy and the external parts of your body will cool down.

The difference between both cases is in the heat conduction capacity of both air and water.

Liquids (and solids) are better thermal conductors than gases because the conduction of heat occurs as result of the direct contact between the particles of matter: the atoms or molecules in hot matter vibrate faster than their neighbors and transmit them kinetic energy by direct contact.

Therefore, the liquid water in the swimming pool, at the same temperature than the air, will be able to absorb more heat in the same time from the body.

In conclusion, the body will cool down faster in water than in air which is why the pool feels cooler than air.

8 0

3 years ago