Answer:
Dopamine
Explanation:
The regions of the brain comprising the “reward system” use the neurotransmitter dopamine to communicate.
PLZ HELP CHEMISTRY SUCKS BRO
Answer:
just click any of the buttons
Answer:
23535
Explanation:
ugggguguygiugiugugiyuuigiuyiugy
Try it
Which statements accurately describe volume? Check all that apply.
Explanation:
what is the question jjsjmwujjduwhfjd
Answer:
Volume is a physical property of an object
One unit of volume is the milliliter
Liquids and solids have constant volumes
Explanation:
which is the correct answer??
Answer:
1
Explanation:
What is the ground-state electron configuration of O2-? A (σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)1(π2p*)1 B (σ2s)2(σ2s*)2(π2p)4(π2p*)1 C (σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2 D (σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1
Answer:
(σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1
Explanation:
In writing molecular orbital configuration, the number of valence electrons involved in the molecule are all written into various molecular orbitals in accordance with the Aufbau principle.
O2^- contains 17 electrons. Its molecular orbital configuration is KK(σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1. Recall that the inner (σ1s)2 and (σ1s*)2 is designated as KK. This inner shell does not take part in bonding. The bond order in O2^- is 1.5.
The ground state electron configuration of O2- is Choice C: (σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2
Discussion:
The molecular orbital configuration is dependent on the number of electrons involved in the molecule.
These are all written into various molecular orbitals as described in the Aufbau principle of electron configuration.
Since O2 contains 16 electrons, when it gains an electron to become O2-;
O2^- contains 17 electrons.
Its molecular orbital configuration is;
KK(σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2.It is noteworthy to remember that the inner (σ1s)2 and (σ1s*)2 are represented as KK. This inner shell does not take part in bonding.
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What is the energy of a photon having a wavelength of 2.60 ✕ 10-8 m?
J
The energy of a photon : 7.645 x 10⁻³⁴ J
Further explanationRadiation energy is absorbed by photons
The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
f = c / λ , Hz
c = speed of light
= 3.10⁸ m/s
λ = wavelength ,m
wavelength λ of 2.60 ✕ 10⁻⁸ m
The energy :
[tex]\tt E=h.\dfrac{c}{\lambda}\\\\E=6.626.10^{-34}\times \dfrac{3\times 10^8}{2.6\times 10^{-8}}\\\\E=7.645\times 10^{-34}~J[/tex]
Question 5 of 5
Carbon has six protons. Which model shows a neutral atom of carbon?
Answer:
its d
Explanation:
Model D shows a neutral atom of carbon as it has 6 protons in the nucleus and 6 electrons in it's orbits.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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#SPJ2
what would decreased the resistance of wires an electric current
Answer:Thicker wires have a larger cross-section that increases the surface area with which electrons can flow unimpeded.
Explanation:I really do not know
What would happen to the food chain, if all the plants were removed?
Answer: chain reaction there will be no carbon and animals who eat plants will die off
Explanation:
Which of the following characterizes the nucleus of every atom?
1. It has a positive charge
2. It is very dense
3. It is composed of protons, neutrons and electrons
a
I and II only
b
I, II and III
c
I and III only
d
II and III only
what is the number of atoms in 1 mole of carbondioxide??
Answer:
6.02×10 to be tge power 23
In a science experiment 50 grams of salt are placed in a metal pan and are dissolved in 100 mL of water. The water is heated for 3 minutes. What is most likely happening in the pan when the water reaches 100°C?
A. The water will have all evaporated.
B. The water will no longer contain salt.
C. The water will be boiling.
D. The water will be cool enough to pour into a beaker.
Answer:
The water will be boiling
Explanation:
When water reaches 100⁰C the water will be boiling.
How is the crust and the inner core alike
Answer:
They are both solids
Explanation:
I had to answer that question a long time ago hope this helps.
What side is the products
a car starts from rest gains velocity 20m/s in 10 second find its acceleration?
Answer:
acceleration(a)=2m/s²
Explanation:
initial velocity(u)=0m/s
final velocity (v)=20m/s
time taken (t)=10sec
now
v=u+at
20=0+a*10
a=2m/s²
can someone pls help me with this!
Answer:
weathered rock and deceomposed material
Explanation:
Balance the foll. equations
Answer:
naf+so2+nho3
Explanation:
beacause sodium is main solution in this equation
Answer:
e) P + O2 → P2O5
balanced equation
4P + 5O2 → 2P2O5
f) NaCl + F2 → NaF + Cl2
balanced equation
2NaCl + F2 → 2NaF + Cl2
g) K + MgBr2 → KBr + Mg
balanced equation
2K +MgBr2 → 2KBr +Mg
h) Mg + O2 → MgO
balanced equation
2Mg + O2 → 2MgO
i) Al + O2 → Al2O3
balanced equation
4Al + 3O2 → 2Al2O3
hope this helps you!
13. Examine the following table, each letter represents a piece of missing information. Below
you will be asked to identify the information to complete certain boxes Copy the letter as
showed under the table with its correct answer. (8 pts)
Name
Symbol
Protons
Neutrons
Electrons
Mass
Oxygen-16
A
18
18
8
E
Chlorine-35
B
18
17
F
35, C
To go
E
F
G
H
Oxygen-18
18
8
Chlorine-37
32, CI
17
20
D
H
Answer: i can understand it sorry
Explanation:
A substance that is composed only of atoms having the same atomic number is classified as
Look up and compare the ionic radii of In3+, Mn3+, and Y3+ for a specific coordination number. Why do you think Mn3+ forms a solid substitution on the In3+ rather than the Y3+ site?
Answer:
See explanation
Explanation:
Substitution implies that one thing is repalced by the other.
Substitution of one ion by another largely depends on the sizes of the ions in question.
The ionic radius of Mn3+ is about 0.65 Angstroms while that of In3+ is about 0.94 Angstroms. On the other hand, the ionic radius of Y3+ is about 1.032 Angstroms.
It is clear that the sizes of Mn3+ and In3+ are closer to each other hence Mn3+ can substitute for In3+ easily than Y3+ in a lattice site.
The larger size of Y3+ explains why it is not easily replaced by Mn3+.
Which phrase best describes bronze?
a copper–tin alloy
an ionic compound of copper and tin
a pure metal
a mineral ore containing copper and tin
Answer:
a mineral ore containing copper and tin
Answer:
Copper-tin alloy
Explanation:
just took the test :D
What type of heat transfer do
dryers use?
Forced convection
Forced radiation
Answer:I believe it forced convections
Explanation:convection is the circular motion that happens when warmer air or liquid makes something less dense.
Answer:
how y'all doinnn
Explanation:
byyeee
does anyone else simp for mhanifa?
Answer:
i dont XD
Explanation:
Answer:
no
Explanation:
Sorry it’s for science
Answer:
A
Explanation:
Density/Formula
\rho ={\frac {m}{V}}
\rho = density
m = mass
V = volume
When determining molecular polarity, which scenario is not possible:
A A polar molecule with polar bonds
B A nonpolar molecule with polar bonds
с A polar molecule with nonpolar bonds
D A nonpolar molecule with nonpolar bonds
Answer: Option C is correct
A polar molecule with nonpolar bonds
Explanation:
A polar molecule with nonpolar bonds cannot be polar because a polar molecule has net dipole that it has one end slightly positive and the other end slightly negative which allows the distribution of atoms .
Therefore it cannot have non polar bonds because non polar bonds allow electrons to be shared equally and it take place between non elemental substances or substances that are not elements , it cannot occur in elemental substances because these substances have different electronegativities which can be held by polar bonds alone.
Answer:
The correct answer is C. A polar molecule with nonpolar bonds
Explanation:
Polarity is the property of a molecule of having a dipole moment. Based on this, a molecule can be polar -with dipole moment- o nonpolar. The polarity of a molecule is determined by:
- the presence of elements with differences in electronegativity which results in polar bonds.
- geometry of the molecule
Polar bonds are vectors and if they are opposite (equal in magnitude with opposite direction) so they are cancelled out. A polar molecule must have polar bonds, buy they can be cancelled out by opposite positions in the molecule geometry. For example, CO₂ (carbon dioxide) has polar bonds C-O because they are composed by elements with different electronegativities, but the molecule is linear so the two bonds C-O are cancelled out and the molecule is nonpolar.
Therefore, from the options, the only non possible scenario is C - a polar molecule with nonpolar bonds - because polar molecules always have polar bonds. The opposite situation can be true: a non polar molecule wiith polar bonds as we saw in the example of CO₂.
HELP ME with THIS I am time i have a little bit of time and still have more questions !!! CHEMISTRY!!
Answer:
1. is B 2. is C or B
Explanation:
Why is fingerprint identification considered a science?
Answer:
Forensic scientists have used fingerprints in criminal investigations as a means of identification for centuries. Fingerprint identification is one of the most important criminal investigation tools due to two features: their persistence and their uniqueness. A person's fingerprints do not change over time.
Explanation:
Which of the following is a chemical change?
melting of ice
burning of wood
breaking of glass
Evaporation of water
Answer:
The answer is burning of wood
Explanation:
just took the quiz
What type of reaction is
Mg + CI -> MgCI2?
A. Double-replacement
B. Synthesis
C. Single-replacement
D. Decomposition
An atom of which element has the strongest attraction for electrons in a chemical bond?
A) chlorine
B) nitrogen
C) oxygen
D) selenium
Answer:
Fluorine. This element has the greatest electronegativity value, so has the greatest attraction to electrons in a bond.
Explanation:
The atom of element with the strongest attraction for electrons in a chemical
bond from the options is Chlorine.
The element with the strongest attraction for electrons in a chemical bond is
the most electronegative element.
The electronegativity of an atom is the tendency of an atom to attract
bonding pairs of electrons.
Generally, electronegativity of an element increases across the period. The
electronegativity of an element also decreases down the group. The most
electronegative element is fluorine.
Halogen group are naturally electronegative.
Therefore, the most electronegative element in the option is chlorine and its
the element that has the strongest attraction for electrons in a chemical
bond.
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If you have 0.95 moles of FeCl3, how many moles of MgCl2 do you produce in the reaction
FeCl3 + Mg --> MgCl2 + Fe?
I REALLY NEED HELP PLEASEEEEE
