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andrezito [222]
3 years ago
15

Which quantity represents the number of protons in an atom?

Chemistry
2 answers:
gizmo_the_mogwai [7]3 years ago
8 0
The answer is (a) atomic number

Atomic number = no. of protons = no. of electrons
WARRIOR [948]3 years ago
7 0
The atomic number is equal to the number of protons in an element.
The oxidation number and valence electrons can vary depending on whether it is an ion or not. The number of neutrons can also vary depending on what isotope the atom is. However, the number of protons cannot be changed without changing the identity of the base atom itself.

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Why would concentrated hydrochloric acid be a poor choice as the acid catalyst for the formation of cyclohexane by dehydration o
babunello [35]

Answer:

Chlorine ion will attack the carbocation and double bond will not be created

Explanation:

The use of concentrated hydrochloric acid wiill be a poor choice as the acid catalyst for the formation of cyclohexane by dehydration of cyclohexanol because of the following reasons:

1) There will be presence of chlorine ions and they will attack the carbocation to form a single bond.

2) The formation of double bond will not occur in the process.

Therefore, it is a poor choice to use concentrated hydrochloric acid as the acid catalyst for the formation of cyclohexane by dehydration of cyclohexanol.

6 0
4 years ago
Which statement best describes how an electromagnetic motor works?
inn [45]

Answer:

Electrons are moved through a magnet, creating a current. That current interacts with a circuit, moving the conductor in the orientation of the field.

Explanation:

Electro magnetic fields are used to create electric current by the movement of electrons. When a coil of wire is wrapped around a magnet it pushes electrons and they flow through a magnet to create current. This current interacts with circuit to move conductor.

5 0
3 years ago
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3 years ago
A balloon filled with helium gas has a volume of 500 mL at a pressure of 1 atm. The balloon is released and reaches an altitude
Rasek [7]
We are using the General gas equation P x V/K = P x V/K
1. P = 1atm V=500ml so PxV= 500 at 6.5km P = 0.5atm V = ? so P xV = 0.5 x V
(We don't have to worry about temperature!) 500 = 0.5 x V so V = 1000ml

2. NO CHANGE in pressure here so we have V/K V=2.75 K = 20 + 273=293 so V/K= 2.75/293
Next set V = 2.46 K = ? so V/K = 2.46/K then 2.75/293= 2.46/K so K=(293/2.75)x2.46
=262 K
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3.Now we have to use all three variables. I am using 273K and 100kPa for STP.
P = 100 V = 700 K = 273 These are altered P - unknown, V = 200 K = 273+30=303
!00 x 700/273 = 256.4 this is equal to P x 200/303 = P x 0.66
so P = 256.4/0.66 = 388.48kPa
7 0
4 years ago
Read 2 more answers
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After your first exposure to a pathogen, you have memory T cells that will remember the antigen of the pathogen son in the future if you would come in contact with the same pathogen your body will recognize it right away and be able to kill it much faster
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