Answers
Answer:
B.
Explanation:
The electron dot diagram which is also known as the Lewis electron dot diagram is a diagram that shows an atom's valence electrons by placing dots, which represent the valence electrons of the element, around the elements symbol
The element for which the electron dot diagram is found = Neon, Ne
The atomic number of neon, Ne = 10
The electronic configuration of neon = 1s²2s²2p⁶
The valence shell is the outermost shell having the highest value of the coefficient of the orbitals, n = 2s²2p⁶
The number valence electrons in neon = The number of electrons in the valency shell = 2 electrons + 6 electrons = 8 electrons
The number of valence electrons in neon = 8
Therefore, the electron dot diagram for neon will have 8 dots located around the Ne symbol, which gives option B
Related Questions
Which element has a smaller ionic radius than magnesium (Mg)?
A) Rb
B) Al
C) Ca
D) Na
Answers
Answer:
Na has atomic number 11
which is less than magnesium has atomic number 12
ANSWER IS D
Explanation:
aluminum or Al is atomic 13 and Ca or calcium is atomic number 20 and rubidium or Rb is atomic number 37
When does the electron shown release the greatest amount of energy as it moves from one level to another
Answers
Answer:
s1 to GS as the amount of energy required to remove the electron is greatest when it is closest to the nucleus.
Explanation:
Fun facts:
When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.
Answer:
The answer is: S.1 to G.S
Hope this helpss :) <3
Explanation:
Teniendo en cuenta la siguiente reacción quimica: Mn (NO3)2 + NaBiO; + HNO, HMnO₂+ Bi (NO3)3 + NaNO3 + H₂O ¿Cuánto Bi (NO₂), se obtiene a partir de 650 g de Mn (NO₂)2 y 700 g de NaBiO, si la eficiencia del proceso es de un 80%?
Answers
Answer:
La masa de Bi (NO₃) ₃ producida es de aproximadamente 2.117,09 gramos
Explanation:
La ecuación química de la reacción se presenta como sigue;
2Mn (NO₃) ₂ + 5NaBiO₃ + 14HNO₃ → 2HMnO₄ + 5Bi (NO₃) ₃ + 5NaNO₃ + 7H₂O
La masa dada de Mn (NO₃) ₂ = 650 g
La masa de NaBiO₃ = 750 g
El número de moles de Mn (NO₃) ₂ = 650 g / (178.95 g / mol) ≈ 3.63 moles
El número de moles de NaBiO₃ = 750 g / (279.968 g / mol) ≈ 2.68 moles
Por lo tanto, el NaBiO₃, es el reactivo limitante, y el rendimiento teórico de Bi (NO₃) ₃ ≈ 5/2 × 2.68 = 6.7 moles
Dado que la eficiencia del proceso es del 80%, el rendimiento real de Bi (NO₃) ₃ = 0,8 × 6,7 moles = 5,36 moles de Bi (NO₃) ₃
La masa molar de Bi (NO₃) ₃ ≈ 394,98 g / mol
La masa de Bi (NO₃) ₃ = 394,98 g / mol × 5,36 moles ≈ 2,117,09 g
La masa de Bi (NO₃) ₃ produjo ≈ 2,117.09 g
a shiny brown colured metal onhaeting in air becomes black in colour when hydrogen gas is passed over the black substance it regain its original colour a]what type of chemical reaction takes place in each of the two given steps
Answers
Oxidation reaction
Hope this helps! :)
Será lançado na próxima quarta-feira, 1º de julho, em São Bernardo do Campo (SP), o primeiro ônibus brasileiro a hidrogênio. [...] O projeto Ônibus Brasileiro à Célula Combustível a Hidrogênio é o ponto de partida para o desenvolvimento de uma solução mais limpa para o transporte público urbano no Brasil. (Disponível em: Acesso em: 19 out. 2009.) Quanto aos processos químicos envolvidos na produção de energia elétrica em células de combustíveis a partir do oxigênio e do hidrogênio, é correto afirmar:
Answers
Read the following reactions. Reaction 1: CaO(s) + CO2(g) → CaCO3(s) Reaction 2: H2O(g) → H2O(l) Which reaction leads to an increase in entropy? Only Reaction 1 Only Reaction 2 Both Reaction 1 and 2 Neither Reaction 1 nor 2
Answers
Answer: In the given reactions neither reaction 1 nor 2 reaction leads to an increase in entropy.
Explanation:
The degree of randomness present in the molecules of a substance is called entropy.
In gases, molecules are held by weak forces due to which they move apart from each other. Hence, they have high entropy.
In liquids, molecules are a little close to each other so they have less entropy than gases.
In solids, molecules are tightly held together so they have least or negligible entropy.
As reaction 1 is [tex]CaO(s) + CO_{2}(g) \rightarrow CaCO_{3}(s)[/tex] and it shows that product is in solid state. Therefore, entropy is decreasing.
As reaction 2 is [tex]H_{2}O(g) \rightarrow H_{2}O(l)[/tex] and it shows that gas is converted into liquid. Therefore, entropy is also decreasing here.
Thus, we can conclude that in the given reactions neither reaction 1 nor 2 reaction leads to an increase in entropy.
Answer: Neither Reaction 1 nor 2
Explanation:
Which statement best describes wave-particle duality as it applies to electrons?
A. The electrons present in radio waves and microwaves act more like particles than waves.
B. Electrons are particles that emit waves of radiation when they move from higher energy levels to lower energy levels.
с.Electron clouds can be understood as clumps of particles held near one another by wave forces.
D.Electrons can be modeled as waves in some situations and as particles in other situations.
Answers
Answer:
D es pero que te ayude amigo
Which is TRUE about 'acidified' water acting on rocks?
Please give 1 answer.
A.
Peaty soil water does not cause weathering
B.
Limestone is eroded faster than basalt rock by this type of weathering
c.
It is an example of physical weathering
D.
Nearly neutral water will not weather rocks
Answers
The frequency of an X ray is 6.5 x 1018 Hz. What is the X ray’s wavelength? .
Answers
Answer:
The X ray’s wavelength is 4.61*10⁻¹¹ m
Explanation:
Wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
The propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave's disturbance propagates along its displacement. Relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f * λ.
In this case:
The frecuency f= 6.5*10¹⁸ Hz The speed v=c= 3*10⁸ [tex]\frac{m}{s}[/tex]Replacing:
3*10⁸ [tex]\frac{m}{s}[/tex]= 6.5*10¹⁸ Hz* λ
Solving:
[tex]wavelength= \frac{3*10^{8} \frac{m}{s} }{6.5*10^{18} Hz}[/tex]
λ= 4.61*10⁻¹¹ m
The X ray’s wavelength is 4.61*10⁻¹¹ m
Which are the fundamental particles whose masses are mainly responsible for the mass of an atom?Give Reason
No links
Answers
Answer:
Proton & neutron
Explanation:
electrons only affect the charge. neutrons affect the mass and stability of an atom.
Find the boiling point of a solution of 2.00 m solution of sodium chloride, NaCl, in water (kb= 0.512°C, bp= 100.0°C)
Answers
Answer: Boiling point of the given solution is [tex]102.048^{o}C[/tex].
Explanation:
Given: Molality = 2.00 m
[tex]k_{b} = 0.512^{o}C[/tex]
Now, equation for dissociation of water is as follows.
[tex]H_{2}O \rightarrow H^{+} + OH^{-}[/tex]
As it is giving 2 ions upon dissociation. So, the value of i = 2.
Formula used to calculate change in temperature is as follows.
[tex]\Delta T = i \times k_{b} \times m[/tex]
where,
i = Van't Hoff factor
[tex]k_{b}[/tex] = molal boiling point elevation constant
m = molality
Substitute the values into above formula as follows.
[tex]\Delta T = i \times k_{b} \times m\\= 2 \times 0.512^{o}C \times 2.00 m\\= 2.048^{o}C[/tex]
As the boiling point of water is [tex]100^{o}C[/tex]. Hence, the boiling point of solution will be as follows.
[tex]\Delta T^{'}_{b} = 100^{o}C + 2.048^{o}C\\= 102.048^{o}C[/tex]
Thus, we can conclude that boiling point of the given solution is [tex]102.048^{o}C[/tex].
If a tornado causes considerable damage with wind speeds of 111 to 135 miles per hour, it’s classified as _______ on the Enhanced Fujita Scale.
The type of major storm called a/an _______ is driven primarily by the Coriolis effect.
The weather pattern that stays over one area for an extended period of time is known as _______.
What are the two types of downbursts, and how are they different?
How is a funnel cloud different from a tornado?
Why does a hurricane begin to dissipate after it makes landfall?
Explain how the heat index and the wind chill index are similar and different.
What type of severe weather prevents sweat from evaporating to cool down bodies?
Answers
Answer:
EF-2
hurricane/tropical cyclone
recurrent weather
The two types of downbursts are macrobursts and microbursts. A macroburst affects an area that's greater than 2.5 miles across. A microburst affects an area that's less than 2.5 miles across.
A funnel cloud forms as a spinning column of air that descends from a thundercloud. However, a funnel cloud doesn't become a tornado until it actually touches the ground. Once it touches the ground, where it begins to pick up dust and debris, it becomes a tornado.
Tropical cyclones, such as hurricanes, are fueled by warm ocean waters. Once they make landfall, they lose this fuel source and begin to lose strength.
The heat index and the wind chill index are similar because both consider other factors that affect how air temperature feels. The heat index considers relative humidity in relation to air temperature. Higher humidity makes air temperatures feel hotter. The wind chill index considers wind speed in relation to air temperature. Higher wind speeds make air temperatures feel colder.
Heat waves—Heat waves can be very dangerous when accompanied by high humidity. The human body depends on evaporation of sweat to cool itself down on hot days. When humidity levels are high, the rate of evaporation slows down. Consequently, it becomes harder for the body to cool itself and much easier for the body to overheat.
Explanation:
took the testoronee
What is the molarity of 4 mol of NaOH dissolved in 2 L of water? O A. 0.5 M OB. 8 M O C. 2M D. 4 M
Answers
Answer:
concentration = mol/volume = 4/2 = 2M
32. Calculate the pH of a solution at 1.00 x 10- MIH") and identify the substance as an acid or base,
Answers
Answer:
[tex]{ \boxed{ \tt{formular : pH = - log[H {}^{ + } ]}}} \\ pH = - log(1.00 \times {10}^{-6} ) = 6: it's an acid\\ since \: we \: lack \: the \: exponent, \: this \: question \: is \: unsolvable \\ { \green{ \bf{take \: note}}} :{ \tt{pH \: below \: 7 \: that \: is \: { \red{acidic}}. \: \: pH \: greater \: than \: 7 \: is \: { \red {basic}}}}[/tex]
Draw the structure formula of 2methylbutanoate
Answers
Answer:
[tex]CH _{3}CH(CH _{3})CH _{2}COO {}^{ - } \\ \\ [/tex]
What effect does the pH of water have on radish seed germination?
Answers
Answer:
High pH negatively affected the germination rate of seeds from most species, but had no effect on the per cent germination of any of the species. The higher concentration of the nutritious solutions affected negatively the germination level and rate
Explanation:
If 3.02 g of CuNO3 is dissolved in water to make a 0.560 M solution, what is the volume of the solution in milliliters?
Answers
Answer: The volume of the solution is 28.75 mL
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}[/tex] .....(1)
Given values:
Molarity of copper nitrate = 0.560 M
Given mass of copper nitrate = 3.02 g
Molar mass of copper nitrate = 187.56 g/mol
Putting values in equation 1, we get:
[tex]0.560=\frac{3.02\times 1000}{187.56\times \text{Volume of solution}}\\\\\text{Volume of solution}=\frac{3.02\times 1000}{187.56\times 0.560}=28.75mL[/tex]
Hence, the volume of the solution is 28.75 mL
Tea contains which acid?
A
Tannic acid
B
Tartaric acid
C
Carbonic acid
D
Citric acid
Answers
Helppppp plz ASAP DON’T GUESS
Answers
Explanation:
A B C D isme koyi ans hain doond lo
definition of boiling point
Answers
Answer:
boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature.
Explanation:
Radhe Radhe❤
Explanation:
The point at which a matter melts is called boiling or melting point.
which metals or non-metals are liquid at a room temperature of 25°C?
Answers
Answer:
gallium
Explanation:
it is the old melting in a hot cup of coffee spoon
Answer:
Elements That Are Liquid at 25°C
•Bromine
•mercury
Explanation:
The metal which exist as a liquid at room temperature is mercury.
Non-metal which exist as a liquid at room temperature is bromine.
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Which reaction will most likely take place based on the activity series? Li > K Ba CaNa > Mn > Zn > Cr> Fe> Cd Ni > H > Sb > Cu > Ag > Pd > Hg > Pt a. Ag+FeCl 3 b, Zn + CaO C. Ba+Na 2 CO 3 d . Cr+KNO3
Answers
Answer:
Among the given reactions,
a. Ag+FeCl 3
b, Zn + CaO
C. Ba+Na 2 CO 3
d . Cr+KNO3
which reaction is likely to take place based on the reactivity series?
Explanation:
The metal reactivity series is:
Li > K> Ba >Ca>Na > Mn > Zn > Cr> Fe> Cd Ni > H > Sb > Cu > Ag > Pd > Hg > Pt
The highly reactive metal will displace the less reactive metal from its compound during a displacement reaction.
a. Ag+FeCl 3
Ag is less reactive than Fe, so Ag cannot displace Fe from its compound.
This reaction also does not occur.
b, Zn + CaO
Zn is less reactive than Ca, so it cannot displace Ca from its compound.
This reaction does not occur.
C. Ba+Na 2 CO 3
Ba is more reactive than Na, so Ba displaces Na from its compound.
This reaction is possible.
d . Cr+KNO3
Cr is less reactive than K, so it cannot displace K from its compound.
Hence, This reaction is not possible.
Answer:
option c) Ba+Na 2 CO 3 -> BaCO3 +2Na
Answer:
C. Ba+Na 2 CO 3 -> BaCO3 +2NaThe expression below was formed by combining different gas laws. V is proportional to StartFraction n T over P EndFraction. Which law was used to determine the relationship between the volume and the number of moles in this equation?
Answers
Answer:
The Ideal gas law
Explanation:
From the given question, we have:
V [tex]\alpha[/tex] [tex]\frac{nT}{P}[/tex]
where each variable has its usual meaning.
Thus,
V = [tex]\frac{nRT}{P}[/tex]
where R is the ideal gas constant
cross multiply to have;
PV = nRT
This implies that the volume of the gas is directly proportional to the number of moles of the gas.
Therefore, the law can be used to determine the relationship between the volume and number of moles is the ideal gas law.
SOMONE HELP DUE IN 5 MINUTES
Answers
Answer:
Silicon
Explanation:
Nucleus
14 protons
Group 14
Number 14
+4, +2, or -4
Answer:
Explanation:
Name of the part of this atom labeled z is nucleus.
number of protons is 14 .
the given element is silicion and it lies in group 14.
the no of period that contains this element is 3.
charge formed on the ion formed from this atom is positive charge because it gives 4 electron to other element .
If the element gains the electron then it has negative charge where as when it loses it will have positive charge.
KHP, the acid used in this experiment,
stands for potassium hydrogen
phosphorous.
True
False
Answers
Answer:
false
Explanation:
standard form is Potassium hydrogen phthalate
How do I solve for a and b using the Van Der Waals equation using only the given values: P= 1 atm, V= 1.310 L, and T= 160 K
Answers
Answer:
[tex]a = \frac{24.79078- 1.7161b}{1.310 - b}[/tex]
[tex]b = 1.310 - \frac{22.5427}{a - 1.7161}[/tex]
Explanation:
Given
[tex]P = 1\ atm[/tex]
[tex]V = 1.310\ L[/tex]
[tex]T =160\ K[/tex]
Required
Solve for a and b
Van Der Waals equation is:
[tex]P = \frac{RT}{V - b} - \frac{a}{V^2}[/tex]
Substitute values for P, V and T, we have:
[tex]1 = \frac{R*160}{1.310 - b} - \frac{a}{1.310^2}[/tex]
R is a constant and the value is:
[tex]R = 0.0821[/tex]
So, the equation becomes:
[tex]1 = \frac{0.0821*160}{1.310 - b} - \frac{a}{1.310^2}[/tex]
Simplify the expression
[tex]1 = \frac{13.136}{1.310 - b} - \frac{a}{1.7161}[/tex] ----- (a)
Solving for (a):
[tex]1 + \frac{13.136}{1.310 - b} = \frac{a}{1.7161}[/tex]
Multiply both sides by 1.7161
[tex]a = [1 + \frac{13.136}{1.310 - b}] * 1.7161[/tex]
Take LCM
[tex]a = [\frac{1.310 - b+13.136}{1.310 - b}] * 1.7161[/tex]
Evaluate like terms
[tex]a = [\frac{14.446- b}{1.310 - b}] * 1.7161[/tex]
Open bracket
[tex]a = [\frac{24.79078- 1.7161b}{1.310 - b}[/tex]
Solving for (b), we have:
[tex]1 + \frac{13.136}{1.310 - b} = \frac{a}{1.7161}[/tex]
Subtract 1 from both sides
[tex]\frac{13.136}{1.310 - b} = \frac{a}{1.7161}-1[/tex]
Take LCM
[tex]\frac{13.136}{1.310 - b} = \frac{a-1.7161}{1.7161}[/tex]
Inverse both sides
[tex]\frac{1.310 - b}{13.136} = \frac{1.7161}{a - 1.7161}[/tex]
Multiply both sides by 13.136
[tex]1.310 - b = 13.136 * \frac{1.7161}{a - 1.7161}[/tex]
[tex]1.310 - b = \frac{22.5427}{a - 1.7161}[/tex]
Collect like terms
[tex]b = 1.310 - \frac{22.5427}{a - 1.7161}[/tex]
What does Seltzer Water have in common with Limestone ?
Answers
What properties can be used to identify substance and why?
Answers
Answer:
All substances can be characterized by their unique sets of physical and chemical properties. Properties that can be determined without changing the composition of a substance are referred to as physical properties. Characteristics such as melting point, boiling point, density, solubility, color, odor, etc.
How much energy does a 930 nm wave of light have? (The speed of light in a vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 J·s.)
A. 4.68 x 10^18 J
B. 2.14 x 10^-19 J
C. 1.85 x 10^-31 J
D. 4.21 x 10^35 J
Answers
Answer:
B. 2.14 x 10^-19 J
Explanation:
The energy of a wave of light can be obtained using the equation:
E = h*c/λ
Where E is the energy in joules,
λ is wavelength = 930nm = 930x10⁻⁹m
h = Planck's constant = 6.626x10⁻³⁴Js
c = Speed of light = 3.00x10⁸m/s
Replacing:
E = 6.626x10⁻³⁴Js*3.00x10⁸m/s/930x10⁻⁹m
E = 2.14x10⁻¹⁹J
Right option is:
B. 2.14 x 10^-19 J
two reactants to produce sodium carbonate salt?
Answers
Answer: equivalent amounts of sodium hydroxide and a solution of sodium hydrogen carbonate
Explanation: