Explanation:
It suggests that the extranuclear part consists of electrons in specific spherical orbits around the nucleus.
The concept is based on the premise that the electrons move round the nucleus in certain permissible orbits or energy levels. The ground state is the lowest energy state available to the electrons. It is the most stable state. The excited state is any higher energy level than the ground state. An electron in an energy level has a definite amount of energy associated with it at that level. The electron can undergo transitions from one level to another. This way energy of an electron is quantized to each level.
What is the molarity of a solution composed of 5.85 g of potassium iodide, KI, dissolved
in enough water to make 0.125 L of solution?
los afuso
Answer:
0.282 M
General Formulas and Concepts:
Chemistry - Solutions
Reading a Periodic TableUsing Dimensional AnalysisMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
5.85 g KI
0.125 L
Step 2: Identify Conversions
Molar Mass of K - 39.10 g/mol
Molar Mass of I - 126.90 g/mol
Molar Mass of KI - 39.10 + 126.90 = 166 g/mol
Step 3: Convert
[tex]5.85 \ g \ KI(\frac{1 \ mol \ KI}{166 \ g \ KI} )[/tex] = 0.035241 mol KI
Step 4: Find Molarity
M = 0.035241 mol KI / 0.125 L
M = 0.281928
Step 5: Check
We are given 3 sig figs. Follow sig fig rules and round.
0.281928 M ≈ 0.282 M
Using water to measure the volume of small irregular shaped objects is called? *
water replacement
water displacement
water displeasure
water reinstatement
Answer:
B. water displacement is used "graduated cylinder is filled with water (100 mL) and the object is then put inside. ... If the new water level is (120 mL) we now know that the object has a volume of 20 mL."
Explanation:
Answer:
I think it would be b.water displacement
PLEASE HELP
The average weather pattern of a region over a long period of time is known as
A weather
B climate
C elevation
D conditions
Answer:
c elevation
Explanation:
C is the answer for your question
Which statement describes effusion?
O It occurs when a gas passes through a tiny hole.
O It occurs when a liquid passes through a tiny hole.
It occurs when gas molecules disperse throughout a container.
It occurs when a liquid disperses throughout a container.
Answer:
It occurs when a gas passes through a tiny hole.
Explanation:
Effusion is a term used to describe when a gaseous molecule in a container passes or escapes through a tiny/small hole. Effusion and diffusion are two properties of gases that are often used interchangeably, however, they differ.
Effusion differs from diffusion in the sense that the gas passes through a TINY HOLE that is smaller than the normal path. This is contrary to when gas disperses throughout a container as in diffusion.
The correct answer is:
A) It occurs when a gas passes through a tiny hole.
Compare and contrast 10kg of melting ice and 1kg of freezing water address temperature heat flow thermal energy what is the simplified answer to that.
Answer:
10 kg of ice will require more energy than the released when 1 kg of water is frozen because the heat of phase transition increases as the mass increases.
Explanation:
Hello!
In this case, since the melting phase transition occurs when the solid goes to liquid and the freezing one when the liquid goes to solid, we can infer that melting is a process which requires energy to separate the molecules and freezing is a process that releases energy to gather the molecules.
Moreover, since the required energy to melt 1 g of ice is 334 J and the released energy when 1 g of water is frozen to ice is the same 334 J, if we want to melt 10 kg of ice, a higher amount of energy well be required in comparison to the released energy when 1 kg of water freezes, which is about 334000 J for the melting of those 10 kg of ice and only 334 J for the freezing of that 1 kg of water.
Best regards!
Why is glucose able to pass through the gut wall
Answer:
Porque las moléculas de glucosa son salvajes
Explanation:
Answer:
Glucose cannot move across a cell membrane via simple diffusion because it is simple large and is directly rejected by the hydrophobic tails. Instead it passes across via facilitated diffusion which involves molecules moving through the membrane by passing through channel proteins.
Explanation:
Easy question please help. DUE IN 15 MINUTES. Calculate the frequency of light that has a wavelength of 9.75 x 10^-7 m.
Answer:
3.077 × 10¹⁴ Hz
Explanation:
f = ?
wavelength = 9.75 × 10-⁷m
using the formula,
c = wavelength × frequency
f = c/wavelength
but c(speed of light) = 3×10⁸m/s
f = 3 × 10⁸/9.75 × 10-⁷
f = 3.077 × 10¹⁴ s-¹
What volume of 18.5 M nitric acid would be needed to make 25.0 mL of 3.0M?
Answer:What volume of 9.00 M nitric acid is needed to make 6.50 L of 1.25 M solution? 903 mL What molarity should the stock solution be if you want to dilute 25.0 mL to 2.00 L and have the final concentration be 0.103 M?
Explanation:
What is the frame of reference?
Answer:
Frame of Reference
The fixed background surrounding an object, assumed to be at rest and in a fixed position.
SOMEONE PLS HELP ASAP IM DESPERATE
Answer:
Wave
Explanation:
1-Convert the following to moles:
6.8 x 10^23 molecules of water
Answer:
1.1 mol H₂O
General Formulas and Concepts:
Chemistry
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Dimensional AnalysisExplanation:
Step 1: Define
6.8 × 10²³ molecules H₂O
Step 2: Convert
[tex]6.8 \cdot 10^{23} \ mc \ H_2O(\frac{1 \ mol \ H_2O}{6.022 \cdot 10^{23} \ mc \ H_2O} )[/tex] = 1.12919 mol H₂O
Step 3: Check
We are given 2 sig figs. Follow sig fig rules.
1.12919 mol H₂O ≈ 1.1 mol H₂O
Answer:
Our final conversion is 1.1 moles of water.
Explanation:
When we want to find the amount of moles in a substance, we can use dimensional analysis or conversion factors in order to convert it from molecules, grams, atoms, formula units, or virtually any other unit.
We are given that we want to convert 6.8 x 10²³ molecules of water to moles. We can set up a dimensional analysis table to solve this.
In dimensional analysis, we multiply across the top and then divide the results by the multiplied value on the bottom.
[tex]\begin{tabular}{c|c}6.8 \times 10^{23} \ \text{molec. of water} & \text{1 mol H}_2 \text{O} \\ \cline{1-2} 1 & 6.022 \times 10^{23} \ \text{molec. of water} & \end{tabular}[/tex]
Now, we will perform our calculations and find our final answer.
[tex](6.8 \times 10^{23}) \times (1) = 6.8 \times 10^{23}[/tex]
[tex](1) \times (6.022 \times 10^{23}) = 6.022 \times 10^{23}[/tex]
[tex]\huge\frac{6.8 \times 10^{23}}{6.022 \times 10^{23}} = 1.129192959[/tex]
[tex]\text{Round to significant figures} \rightarrow 1.129192959 \approx 1.1[/tex]
Therefore, using our table, we have determined that our final answer is 1.1 moles of water.
[tex]\begin{tabular}{c|c}6.8 \times 10^{23} \ \text{molec. of water} & \text{1 mol H}_2 \text{O} \\ \cline{1-2} 1 & 6.022 \times 10^{23} \ \text{molec. of water} & \end{tabular} = 1.1 \text{moles of water}[/tex]
What type of element is Hydrogen? Where do you see hydrogen present?
/~\ The correct answer is:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hydrogen is a chemical and is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen. On Earth, hydrogen is found in the greatest quantities as water.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I hope this helps! /~\
6th grade science i mark as brainliest
Answer:
.......................................................
Explanation:
which two letters has the most kinetic energy?
W
X
Y
Z
Answer:
x and y
Explanation:
Answer:
wx
Explanation:
Because the w is going toward the x
Complete the chemical name of the compound CoI3
Answer:
Cobalt (III) Iodide
General Formulas and Concepts:
Chemistry - Compounds
Reading a Periodic TableWriting CompoundsNaming CompoundsExplanation:
Step 1: Define
CoI₃
Step 2: Identify
Co is a Transition Metal, has either a charge of 2+ or 3+
I is a Halogen, has a charge of 1-
Step 3: Write name
We need to balance the charges, and in order to do that, we must have a Co³⁺
Cobalt (III) Iodide
Do you notice a pattern in the charge for elements in each group? Explain.
(Hint: relate to number of valence electrons and the octet rule)
Answer:
Below are some patterns in the charge for elements in each group.
Group 1 elements : 1 valence electron and form ions with charge +1
Group 2 elements : 2 valence electrons and form ions with charge + 2
Group 3 elements : 3 valence electrons and form ions with charge + 3(there are some exceptions as well)
Elements in groups 4 and 5 are unpredictable also the D block elements consist of multiple oxidation states..
Group 6 elements : 6 valence electrons, form ions with charge -2
Group 7 elements: 7 valence electrons, form ions with charge -1
The octet rule is being followed, the elements form either ionic bond or covalent bond to fulfill it.
eg: when a K atom forms a K+ ion, the ion has the same electron configuration as the noble gas Ar (argon).
When an O atom gains 2 electrons to form the O²⁻ ion, the ion has the same electron configuration as the noble gas Ne (neon).
Note: Boron (B) is in Group 3 but doesn't form ions.
A noticeable pattern in the charge for elements in each group of the periodic table is that: Elements in the same group have the same charge.
Discussion:
The pattern in the charge for elements in each group is characterized by the adoption of the same charge for elements in the same group irrespective of the period they are situated in.
An example is evident in the alkali metal, halogen and alkali Earth metals group.
The alkali metals lose their only Valence electron, to assume the octet configuration of the preceeding noble gas.
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What is the most common acid and base on earth?
Answer:
hydrochloride acid
Explanation:
hope this helps :D
Chris the chemist was working in the and he wanted to sou what would happen he put copper chloride into a Bunsen flameAs soon as it the , began 10 amit a green color Which of these BEST describes this outcome
The question is incomplete, the complete question is;
Chris the Chemist was working in the lab, and he wanted to see what would happen if he put copper chloride into a Bunsen burner flame. As soon as he put it in the flame, it began to emit a green color. Which of these BEST describes this outcome?
A) The heat split the nucleus and created a new element.
B) As the copper chloride was heated, electrons were turned into neutrons.
C) As the electrons moved to a higher energy level, a photon of light is emitted.
D) When excited electrons return back to the ground state, a photon of light is emitted.
Answer:
D) When excited electrons return back to the ground state, a photon of light is emitted.
Explanation:
According to Bohr's model of the atom, electrons may absorb energy and move up to higher energy levels.
These electrons quickly return to ground state from such higher energy excited states thereby emitting the excess energy absorbed during excitation.
If the higher energy level is E2 and the ground state is E1 then the energy of the photon emitted when the electron descends from energy level E2 to E1 is;
ΔE = E2 - E1
This photon emitted accounts for the green colour of the copper salt observed when it was heated.
100 POINTS!!! WILL MARK BRAINLIEST!!!
How do you find the moles per gram of an element?
Answer:
Explanation:
Start with the number of grams of each element, given in the problem.
Convert the mass of each element to moles using the molar mass from the periodic table.
Divide each mole value by the smallest number of moles calculated.
Round to the nearest whole number. This is the mole ratio of the elements and is.
analysis of a hydride of nitrogen shows that 1g of hydrogen combined with 7g of nitrogen. What is the simplest formula of the hydride?
1 point
a)N2H
b)NH2
c)NH4
d)N2H4
Answer:
the answer in simplest form is A) N2H
Please help I have been stuck on this for a long time.
* Lab question: How can you distinguish a physical change from a chemical change?
> Format: How can you distinguish A from B?
Answer! Comparison: physical changes vs. chemical changes
Situation B would produce what kind of spectra?
Hot Gas
Cold Gas
help
Answer:
It would be C because its continuing to the next. It doesn't stop nor does it absorb anything.
Explanation: I hope this helps :) I'm only in 8th grade but this seems easy so if I am wrong I am soo sorry.
BRAINLIEST IF RIGHT
Students at a school are comparing soil samples from random gardens around the neighborhood to identify the best soil to use for their community garden. The students know that soil texture affects the consistency of soil and how easily water can move into the soil. Which of the following soil sample should the student’s choice for their garden?
A.
Sample A
B.
Sample C
C.
Sample D
D.
Sample B
If you pour water into a hot metal pan, the water will absorb heat energy from the pan. Will the water come to the same temperature of the hot pan? What is the process? If you put the pan on the stove top, the stove top will heat both the pan and the water inside the pan, but it does not heat the two materials at the same rate
Answer:
Yes
Explanation:
It is heating up both
Which phrase most accurately describes a chemical change?
Question 3 options:
A change on the molecular level.
A change in appearance.
A change in taste.
A change in form.
The phrase that most accurately describes a chemical change is; "A change on the molecular level."
The major difference between a physical change and a chemical change is that a chemical change involves a change in the composition of a substance.
This implies that the atoms in a substance are rearranged during a chemical change.
This rearrangement of atoms corresponds to change on a molecular level.
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Hydrogen gas is bubbled into a solution of barium hydroxide that has sulfur in it. The unbalanced equation for the reaction that takes place is: H2+S+OH- —-> S2- + H2O
What volume of 0.258 M Ba(OH)2 is required to react completely with 3.00g sulfur?
Volume of Ba(OH)₂ : 0.363 L
Further explanationBalanced equation :
H₂(g)+S(s)+2OH⁻(aq)⇒ S²⁻(aq)+2H₂O(l) (eq 1)
Ba(OH)₂⇒Ba²⁺+2OH⁻ (eq 2)
mol S :
[tex]\tt \dfrac{3~g}{32~g/mol}=0.09375[/tex]
mol OH from eq 1 : (mol S : mol OH = 1 : 2)
[tex]\tt \dfrac{2}{1}\times 0.09375=0.1875[/tex]
mol Ba(OH)₂ from eq 2 : (mol Ba(OH)₂ : mol OH⁻=1 : 2)
[tex]\tt \dfrac{1}{2}\times 0.1875=0.09375[/tex]
volume of Ba(OH)₂ :
[tex]\tt Volume =\dfrac{mol}{M}=\dfrac{0.09375}{0.258}=0.363 L[/tex]
What is molar mass of C7H6O2
Question: ¿What is molar mass of C7H6O2?
Answer: 122,12 g/mol
IamSugarBee
Ethanol is a:
A. substance
B. heterogeneous mixture
C. homogenous mixture
Answer: i think it is A
Explanation:
hope this helps!
If you were going to draw a Lewis model of magnesium, how many valence electron dots would you do?
A sealed 10.0 L flask at 400 K contains equimolar amounts of ethane and propanol in gaseous form. Which of the following statements concerning the average molecular speed of ethane and propanol is true?
(A) The average molecular speed of ethane is less than the average molecular speed of propanol.
(B) The average molecular speed of ethane is greater than the average molecular speed of propanol.
(C) The average molecular speed of ethane is equal to the average molecular speed of propanol.
(D) The average molecular speeds of ethane and propanol cannot be compared without knowing the total pressure of the gas mixture.
Answer:
Im a 100% sure it is B. average molecular speed of ethane is greater than the average molecular speed of propanol.
Explanation:
Sry I didnt' get the explaination from my teacher.
According to the Kinetic theory of gases, the average speed of all gases at the same temperature will be in the same range. Hence, option C is correct.
What is kinetic theory of gases ?Kinetic theory of gases states the properties and composition of gases at a temperature and pressure. According to this theory, gaseous substances are made of tiny particles which are free to move and collide to each other.
The kinetic energy of the particles is directly proportional to the temperature. Hence, as the temperature increases, the kinetic energy increases and their average molecular speed increases.
At the same temperature, all the gases have equal range of average molecular speed irrespective of their molecular weight. Hence, at 400 K the average molecular speed of ethane and propanol will be the same.
Find more on kinetic theory :
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