Answers
\(\huge\colorbox{red}T\colorbox{orange}h\colorbox{yellow}a\colorbox{green}n\colorbox{blue}k\colorbox{purple}s\)
\(\huge\colorbox{red}A\colorbox{orange}n\colorbox{yellow}o\colorbox{green}?\)
Related Questions
what does the first ionization energy represent?
A. the energy required to add an electron
B. the energy to remove an energy level of electrons
C. the energy required to remove an electron from an atom
D. the energy given off when an electron is gained
Answers
The first ionization energy represents Option C. the energy required to remove an electron from an atom.
The ionization energy is defined as the energy required to remove an electron from a gaseous atom or ion to form a cation that carries a charge of +1.Ionization energy is an essential property of an element, and it is determined by the effective nuclear charge (Zeff) and the distance between the valence electrons and the nucleus. The effective nuclear charge is the positive charge that an electron experiences from the nucleus.
The closer the valence electrons are to the nucleus, the greater the effective nuclear charge, making it more challenging to remove an electron from the atom. The ionization energy increases from left to right and from bottom to top across the periodic table. The ionization energy decreases from top to bottom and from right to left across the periodic table. The reason for this trend is the increase in atomic radius and the decrease in effective nuclear charge from top to bottom and from right to left on the periodic table.
Ionization energy plays a significant role in chemical reactions, particularly in redox reactions. The energy required to remove an electron from an atom or ion is equivalent to the energy released when the ion or atom gains an electron. A high ionization energy indicates that the atom is less reactive and more stable since it requires a lot of energy to remove an electron. Therefore the correct option is C
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I need help with this chemistry equation
Answers
4Fe + 3O2 —> 2Fe2O3
So you’re given 25.4 g of iron which you must convert to moles
(25.4 g Fe/55.85g/mol)
This will give you moles of Fe but now you must use a mole ratio to get to grams of O2
(3 mol O2/4 mol Fe)
Now you’re in moles of O but you want grams so multiply by 32 g/mol (not 16 bc it’s O2)
(32 g/mol)
So the end equation should look like
(25.4 g Fe/55.85g/mol) (3 mol O2/4 mol Fe) (32 g/mol) = 10.9 g O2
Highly permeable soil that is capable of storing water is called a(n)___________.
A. aquifer
B. water table
C. irrigated system
D. groundwater reserve
Answers
Answer:
The answer is A. Aquifer
Explanation:
It stores groundwater.
T/F Adsorption is a real problem in gravimetry, especially when the particle size is large
Answers
Answer:
False
Explanation:
what is the formula for selenium tetrafluoride
Answers
Answer:
SeF4
Explanation:
SeF4
Answer:
The anwser is SeF4
A heat engine with 0.500 mol of a monatomic ideal gas initially fills a 3000 cm3 cylinder at 800 K. The gas goes through the following closed cycle: - Isothermal expansion to 4000 cm3. - Isochoric cooling to 300 K. - Isothermal compression to 3000 cm3. - Isochoric heating to 800 K.
Answers
Answer:
Explanation:
\(\text{For isothermal expansion:}\)
\(W_1 = nRT_1 In (\dfrac{V_2}{V_1}) \\ \\ W_1 = 0.5 \times 8.314 \times 800 \times In (\dfrac{4000}{3000})\\ \\ W _1 = 956.72 \ J \\ \\ Q_1 = W_1 = 956.72 \ J \ since \ (dU=0) \\ \\ \\ \text{For isochoric cooling,} W_2 = 0} \\ \\ Q_2 = nCr \Delta T \\ \\ Q_2 = 0.5 (\dfrac{3R}{2})(T_2-T_1) \\ \\ Q_2 = 0.5 \times \dfrac{3\times 8.314}{2}(-500)= -3117.75\)
\(\text{For Isothermal compression:}\\\\ W_3 = nRT_2 \ In (\dfrac{V_4}{V_3}) \\ \\ 0.5 \times 8.314 \times 300 \times In (\dfrac{3000}{4000}) \\ \\ W_3 =- 358.77 \ J \\ \\ Q_3=W_3= - 358.77 \ J\)
\(\text{For isochoric heating; }W_4 =0} \\ \\ Q_4 = nC_v\Delta T \\ \\ = 0.5 \times \dfrac{3}{2}\times 8.314 \times 500 \\ \\ Q_4 = 3117.5 \ J\)
\(\text{Total workdone W}= W_1 + W_2+W_3+W_4 \\ \\ W = 956.71 \ J + 0 + (-358.77 \ J) +0 \\ \\ \mathbf{W = 597.94 J} \\ \\ \\ \eta = \dfrac{Work \ done}{heat \ taken } \\ \\ \eta = \dfrac{W}{Q_1+Q_4} \\ \\ \eta = \dfrac{597.94 \ J}{956.71 \ J + 3117.5 \ J} \\ \\ \eta = 0.1468 \\ \\ \mathbf{\eta = 14.68\%}\)
in which location are there no changes in season
a north pole
B South Pole
C equator
D antártica
Answers
Answer: I'm going to say it's Antartica because the only seasons it have is summer and winter and it doesn't change.
Explanation:
Why is it important to use standard measurements and units in science
Answers
Unit' is the word used to describe how something is measured. When researching a question in science, we collect data, interpret it, and share the results with other scientists. A common measurement system allows us to make direct comparisons instead of having to know things like how much a certain animal weighs.
1. A 55.0g sample of iron(II) filings reacts with 23.8g of powdered sulfur (Sa). What is
the limiting reagent, excess reagent, and theoretical yield?
Answers
Due to its smaller quantity relative to iron(II) filings, sulphur acts as the limiting reagent in the reaction between iron(II) filings and iron. Since sulphur and iron(II) filings have a mole ratio of 1.74:1, we can determine the theoretical yield.
We calculate the amount of sulphur present in 0.742 mol by dividing the sulfur's mass (23.8 g) by its molar mass (32.06 g/mol). This is multiplied by the mole ratio, which results in a theoretical yield of 1.33 mol.
By dividing the moles of iron(II) filings (0.983 mol) by their molar mass (55.85 g/mol), one may calculate the theoretical yield of iron(II) filings, which is 54.6 g. Calculated as the difference between the original amount and the predicted yield (55.0 g - 54.6 g), the surplus iron(II) filings total 0.4 g.
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If 4.55 moles of hydrogen were reacted with excess nitrogenin the equations N2 + 3 H2 = 2 NH3 and 48.7 g of ammonia product was recovered what would be the percent yield of the reaction?
Answers
Answer:
Percent yield = 94.5%
Explanation:
Given data:
Number of moles of hydrogen = 4.55 mol
Mass of ammonia recovered = 48.7 g
Percent yield of ammonia = ?
Solution:
Chemical equation:
N₂+ 3H₂ → 2NH₃
Now we will compare the moles of ammonia and hydrogen.
H₂ : NH₃
3 : 2
4.55 : 2/3×4.55 = 3.03 mol
Theoretical yield of ammonia:
Mass = number of moles × molar mass
Mass = 3.03 mol × 17 g/mol
Mass = 51.51 g
Percent yield:
Percent yield = ( actual yield / theoretical yield ) × 100
Percent yield = (48.7 g/ 51.51 g) × 100
Percent yield = 0.945 × 100
Percent yield = 94.5%
Calculate the number of molecules in 4.99 Mol of Methane .
Answers
Answer:
3.003 × 10²⁴ moleculesExplanation:
The number of molecules can be found by using the formula
N = 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 = 4.99 × 6.02 × 10²³
We have the final answer as
3.003 × 10²⁴ moleculesHope this helps you
What is the mass of 2.14 mol CaCl2?
Answers
Answer:
237.5 grams CaCl2
Explanation:
Use the periodic table to calculate the mass of CaCl2
40.078+(35.45*2)=110.97800
Convert: 2.14 mol CaCl2 * 110.98g CaCl2/1 mol CaCl2 = 237.4972 g
Calculate the pOH if the [OH-] concentration is 5.9 x 10_, M? Is the solution ACIDIC, BASIC, or NEUTRAL?
Answers
If the [OH-] concentration is 5.9 x 10^(-M), the pOH of the solution is approximately -4.77 and the solution is basic.
To calculate the pOH of a solution, we can use the formula:
pOH = -log[OH-]
Given that the [OH-] concentration is 5.9 x 10^(-M), we can substitute this value into the formula:
pOH = -log(5.9 x 10^(-M))
Calculating this expression, we find:
pOH = -log(5.9 x 10^(-M))
pOH ≈ -log(5.9) + (-log(10^(-M)))
Since log(10^(-M)) is equal to -M, the equation simplifies to:
pOH ≈ -log(5.9) - M
Now, we need the value of M (the exponent) to calculate the exact pOH value. It appears that the value of M is missing in the given information. However, assuming M is a positive value, we can continue the calculation.
If we consider M = 6, for instance, the equation becomes:
pOH ≈ -log(5.9) - 6
Now, we can evaluate the expression:
pOH ≈ 1.23 - 6
pOH ≈ -4.77
Therefore, if the [OH-] concentration is 5.9 x 10^(-M), the pOH of the solution is approximately -4.77.
To determine whether the solution is acidic, basic, or neutral, we can use the relationship between pH and pOH. The sum of the pH and pOH of a solution at 25°C is always equal to 14.
Since pOH = -4.77, the pH would be:
pH = 14 - pOH
pH ≈ 14 - (-4.77)
pH ≈ 18.77
A solution with a pH above 7 is considered basic. In this case, the calculated pH is greater than 7. Therefore, the solution is basic.
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2Ca+1O2 -> 2CaO
How many grams of calcium is used in this reaction, if 15.0g calcium oxide are produced
Answers
1:1 ratio
0.267… x 40.1 = 10.721…
10.7g
Does the shape of molecule matter?
Answers
help asha balance the following equation by completing the equation with the correct numbers: co equation c co2
Answers
The Balanced Eqn is 2CO+O2→2CO2.
A chemical reaction is a method wherein one or more materials, also called reactants, are transformed into at least one or more special substances, called merchandise. Materials are both chemical elements or compounds.
A few synthesis reactions can result in more than one product. Photosynthesis is one of the maximum important chemical reactions on earth. It allows plants and a few microbes to transform water and carbon dioxide gas into storable sugar and oxygen.
Chemical compounds are made from atoms of different elements, joined collectively through chemical bonds. A chemical synthesis normally involves the breaking of existing bonds and the formation of recent ones.
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How many grams are in 3.45 moles CO2
Answers
To Find:-
Grams Present in 3.45 Moles of Carbon.
We Know:-
Molecular Mass of Carbon Dioxide= 44.01 grams/mol or 44 grams/mol
\( \text{Moles} = \frac{\text{Mass}}{\text{Molecular mass}}\)
\( \implies 3.45 \text{moles} = \frac{ \text{Mass}}{44 \text{g/mol}} \\ \\ \implies \text{Mass} = {44 \text{g/mol}} \times 3.45 \text{moles} \\ \\ \implies \text{Mass} = {44 \text{g/} \cancel\text{ mol}} \times 3.45 \cancel\text{moles} \\ \\ \implies \text{Mass} = 44 \text{g} \times 3.45 \\ \\ \implies \text{Mass} = \red{151.8 \text{g}}\)
\(\therefore \text{Mass of 3.45 Moles of Carbon Dioxide is = \red{151.8g}}\)
Hope This Helps!!A gas occupying 50.0 ml volume in a confined space at 20.0 dc at 50.0 kpa is heated to 40.0 dc. What is the pressure exerted by the gas in the container?
Answers
Answer:The pressure exerted by the gas is 100kPa
Explanation:Let's apply the Charles Gay Lussac law, to solve the question.
At constant volume, the pressure varies proportionally with the temperature.
P initial / T° initial = P final / T° final
50kPa / 20°C = P final / 40°C
Temperature has increased the double, so the pressure will be increased, the double too.
100 kPa
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Where are most of the state’s wind farms located? Why do you think this is?
Answers
A wind farm can also be located offshore in most of the state.
Why in most of the state wind frames are located in offshore?
Offshore, faster wind speeds allow for substantially greater energy production. The term "offshore wind energy" describes the installation of wind farms inside of bodies of water. To produce electricity, they use the sea winds. These wind farms may employ floating wind turbines or turbines with solid foundations. Also, compared to other renewable technologies, offshore wind is more similar to onshore wind in terms of resource accessibility and technological maturity. Offshore wind farms are starting to blend into the water and coastal environment as a result.
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Calcium carbonate decomposes to form calcium oxide and carbon dioxide, like this:
CaCO3(s)→CaO(s)+CO2(g)
At a certain temperature, a chemist finds that a 9.0L reaction vessel containing a mixture of calcium carbonate, calcium oxide, and carbon dioxide at equilibrium has the following composition:
Compound Amount
CaCO3 25.3 g
CaO 14.9 g
CO2 33.7 g
Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits.
Answers
Answer: The value of the equilibrium constant Kc for this reaction is 0.088
Explanation:
\(Molarity=\frac{x}{M\times V_s}\)
where,
x = given mass
M = molar mass
\(V_s\) = volume of solution in L
Equilibrium concentration of \(CaCO_3\) = \(\frac{25.3}{100\times 9.0}=0.028M\)
Equilibrium concentration of \(CaO\) = \(\frac{14.9}{56\times 9.0}=0.029M\)
Equilibrium concentration of \(CO_2\) = \(\frac{33.7}{44\times 9.0}=0.085M\)
The given balanced equilibrium reaction is,
\(CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)\)
The expression for equilibrium constant for this reaction will be,
\(K_c=\frac{[CaO]\times [CO_2]}{[CaCO_3]}\)
Now put all the given values in this expression, we get :
\(K_c=\frac{0.029\times 0.085}{0.028}=0.088\)
1. A balloon is inflated to a pressure of 2.55 atm at a temperature of 25 °C. What temperature
(in °C) is required to maintain the same volume if the pressure decreases to 1.39 atm?
Answers
Answer :
-111°C
Hope it helps
The final temperature of the gas in the balloon is equal to -110.6°C.
What is Gay Lussac's law?Gay-Lussac's law can be described as when the volume of the gas is kept constant then the pressure (P) is directly proportional to the absolute temperature (T in kelvin) of the gas.
The mathematical representation of Gay Lussca's law can be written as follows:
P/T = k
The pressure (P) of a gas is always directly proportional to the temperature (T) of the gas.
P ∝ T (where volume is constant)
\(\frac{P_1}{T_1} =\frac{P_2}{T_2}\)
Where P₁, T₁, P₂, and T₂ are the initial and final pressure and temperature.
The initial temperature of the balloon, T₁ = 25 °C = 25 + 273 = 298 K
The initial pressure of the balloon, P₁ = 2.55 atm
The final pressure of the balloon, P₂ = 1.39 atm
Substituting temperatures and pressures of the gas in the balloon in the above equation:
2.55/298 = 1.39/T₂
T₂ = 162.4 K
T(K) = 273 + T(°C)
T(°C) = 162.4 - 273 = - 110.6°C
Therefore, the final temperature of the gas inside the balloon is -110.6°C.
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Cu20(s) + C(s) - 2Cu(s) + CO(g)
To perform this synthesis, the team added 114.2 grams of Cu20 to 11.1 grams of C to form 87.1 grams of Cu.
In this copper synthesis reaction, what is the limiting reagent and the excess reagent?
Answers
Answer:
That means Cu2O is limiting reagent and C is excess reagent
Explanation:
Based on the reaction, 1 mole of Cu2O reacts per mole of C. The ratio of reaction is 1:1.
To solve this question we need to convert the mass of each reactant to moles. The reactant with the lower amount of moles is limiting reactant and the excess reactant is the reactant with the higher number of moles.
Moles Cu2O -Molar mass: 143.09 g/mol-
114.2g Cu2O * (1mol / 143.09g) = 0.798 moles Cu2O
Moles C -Molar mass: 12.01g/mol-
11.1g C * (1mol / 12.01g) = 0.924 moles C
That means Cu2O is limiting reagent and C is excess reagent
Convert 100.6 Kelvin to degrees C.
°C = K - 273
[?] °C
Answers
Answer:
-172.6 °C
Explanation:
You want to know the Celsius equivalent of the temperature 100.6 K.
ConversionThe relation is ...
C = K - 273.15
C = 100.6 -273.15 = -172.55
The temperature is -172.55 °C, about -172.6 °C.
__
Additional comment
We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.
What is the fundamental different between combustion and nuclear reaction
Answers
Answer:
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclear.
A chemist requires a large amount of 1-bromo-4-phenyl-2-butene as starting material for a synthesis and decides to carry out the following NBS allylic bromination reaction in the presence of UV light. Draw the structures of all of the observed products.
NBS
(C6H5)CH2CH = CHCH3 → ?
CCI4
Draw one additional resonance structure for the species below:
CH3CH=CHCH=CHCH=CHCH2
Answers
Answer:
CH 2 CH 3 CHCH = C6H5 + 5 Hydrogen Atoms
I hope I helped you.
Deepest apologies if I was wrong!
Bye!
~ Myaka O.
What physical and chemical properties should braces (used to straighten teeth possess in order to attain its desired goal to straighten the teeth) while not presenting a health hazard to the individual?
Answers
Answer: Braces are used by the people to correct the alignment and position of tooth or teeth in the jaw.
Explanation:
The teeth braces must have strong tensile strength and must create a constant pressure on the teeth so as to allow the straightening of the teeth.
The strong force of attraction between the molecules of the braces material that can be steel, nickel, molybdenum, copper, titanium. This makes the bracing material rigid on the teeth.
HELP
What happens when nitrogen fills its valence shell?
Three electrons are lost, creating N+3.
Three electrons are gained, creating N−3.
Three electrons are lost, creating N−3.
Three electrons are gained, creating N+3.
Answers
Answer: "Three Electrons Are Gained"(N⁻³)
Nitrogen has an Incomplete Octet With an Electronic Configuration of
1S²2S²2P³
The P orbital takes a Maximum of 6 electrons.
When this shell is filled... The electronic Configuration of Neon is obtained.
1S²2S²2P⁶
This is also know as the Nitride Ion (N⁻³).
Answer:
D
Explanation:
took the test
Acid rain can be caused by all of the following except..
Select one:
A. automobile exhaust.
B. coal-burning power plants.
C. earthquakes.
D. volcanic eruptions.
(I’ve come to the conclusion that they all can cause acid rain, so I am at a loss as to which one doesn’t.)
Answers
Answer:
Earthquakes
I might be wrong. Hope this helps
Answer:
earthquake
Explanation:
they all can cause house break and people die dangerous
Determine whether each of the following salts will form a solution that is acidic, basic, or pH-neutral.
a. KCl
b. NaClO
c. Al(ClO4)3
d. NH4Cl
e. C5H5NHF
f. NaBr
g. Ca(NO2)2
Answers
Answer:
a) Neutral
b) Basic
c) Acidic
d) Acidic
e) Basic
f) Neutral
g)
Explanation:
a) KCl is a neutral salt because K ion in solution form produces both acid and base (KOH)
b) NaClO produces basic solution because ClO− is the conjugate base of a weak acid
c) Al(ClO4)3 will produce acidic solution because ClO4 is component of strong acid
d) NH4Cl will produce acidic solution because NH4+ ion is a strong conjugate acid of the weak base and Cl- is a weak conjugate base of the strong acid
e) Basic
f) Neutral salt
g) Acidic
pOH of the 0.001M NaOH solution is
Answers
The pOH of the 0.001 M NaOH solution is approximately 3.
To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.
In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.
The pOH is calculated using the equation:
pOH = -log[OH-]
Substituting the concentration of hydroxide ions, we have:
pOH = -log(0.001)
Using a calculator, we can evaluate the logarithm:
pOH ≈ 3
Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.
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