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Anastasy [175]
2 years ago
5

PLEASE HELP!!!

Chemistry
2 answers:
umka21 [38]2 years ago
7 0

Answer:

the answer is A

Explanation:

physical changes does not change the property of matter.

Serhud [2]2 years ago
5 0

Answer: A

Explanation:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity  of the substance.

According to this statement the option A that is, melting point is a physical property of matter because when a substance melts, it changes from a solid to a liquid but it still the same substance explains a specific character of a physical property

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What electron could have quantum numbers n = 2, l = 1, ml = 0, ms = +?
MrMuchimi
Answer is: electron in 2pz orbital.

The principal quantum number is one of four quantum numbers which are assigned to each electron in an atom to describe that electron's state, n=1,2,3... n=2 - <span>the </span>second energy level.<span>
The azimuthal quantum number is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital. l = 0,1...n-1, when l = 1, that is p </span>subshell.

The magnetic quantum number<span>, </span><span>ml, show</span> orbital<span> in which the electron is located, ml = -l...+l, ml = 0  is pz orbital.</span>

The spin quantum number<span>, </span><span>ms</span><span>, is the spin of the electron; ms = +1/2 or -1/2.</span>


7 0
3 years ago
I cant remember my mass, grams, and volume. and how to divide density
Bas_tet [7]
Mass divide by volume

M
__
V
7 0
3 years ago
"the charcoal from a tree killed in the volcanic eruption that formed cedar lake in oregon contained 44.5% of the carbon-14 foun
nalin [4]
The half life of carbon-14 is 5700 years. (Half life is the time taken by a radioactive isotope to decay by half of its original mass). 
Let A₀ be the initial amount of carbon-14 that is found in living matter (t=0 years), to determine when there was 44.5% of A₀ left.
44.5 = 100 × (1/2)^n, where n is the number of half lives
0.5^n = 0.445
    n = log 0.445/log 0.5
    n = 1.168
But 1 half life is 5700 years
Therefore, the number of years will be 5700 × 1.168 = 6658.299725 years
≈ 6658.30 years

3 0
3 years ago
22. A piece of wood board contains approximately 6.76 X 1023 molecules of wood, C2H4920, how
Licemer1 [7]

Answer:

<h2>1.23 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{6.76 \times  {10}^{23} }{6.02 \times  {10}^{23} }  =  \frac{6.76}{6.02}  \\  = 1.22923...

We have the final answer as

<h3>1.23 moles</h3>

Hope this helps you

5 0
3 years ago
Explain how molar mass relates the mass of an atom to mass and moles of the atom
satela [25.4K]
<span>Molar mass is the mass in grams of one mole of any pure substance.</span>
3 0
2 years ago
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