ASAP HELP
The troposphere revives most of its heat energy from the blank
How many molecules are in 37 grams of H2O
Answer:
2.053812097286304 mol
A 60-g sample of radioactive isotope is measured after two half-lives have passed. What pair of percentages describes the sample after two half-lives?.
Answer:
25% is left 15 gm
Explanation:
(1/2)^2 = 25%
Answer:
b. 25% unchanged and 75% stable
Explanation:
got it right on edge
Which electromagnetic wave does the student replace the question mark with in the table?
A
radio waves
B
gamma rays
C
infrared waves
D
visible light waves
Answer:
B) Gamma
Explanation:
Gamma is by far the most powerful, and only one that can produce this much energy
option c is your answer.
Br2(g) cl2(g)⇌2brcl(g) δh∘f for brcl(g) is 14. 6 kj/mol. Δs∘f for brcl(g) is 240. 0 j/mol
The Change in Gibb's free energy, ΔG for the reaction at 298K is; -56.92KJ.
Gibb's free energy of reactionsIt follows from the Gibb's free energy formula as expressed in terms of Enthalpy and Entropy that;
ΔG = ΔH - TΔSOn this note, it follows that;
ΔG = 14.6 - (298× 0.24)Hence, the Gibb's free energy for the reaction is;
ΔG = 14.6 - 71.52ΔG = -56.92KJRemarks: The question requires that we determine the Gibb's free energy for the reaction at 298K.
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The Gibbs free energy for the reaction Br²(g) Cl²(g)⇌2BrCl(g) is -56.92 KJ.
What is Gibbs Free energy?It's the total work done in a closed thermodynamic system.
By the formula of Gibbs free energy
[tex]\rm \Delta G = \Delta H - T \Delta S[/tex]
The H is 14.6 KJ/mol
The change in temperature is 0.24
Putting the values in the equation
[tex]\Delta G = 14.6 - (298 \times 0.24)\\\\ \Delta G = 14.6 - 71.52\\\\ \Delta G = -56.92KJ[/tex]
Thus, the Gibbs free energy for the reaction is -56.92 KJ
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The equilibrium for the reaction between (ch3)2nh a weak base
The equilibrium for the dissolution of the weak base is ;(CH3)2NH(aq) + H2O(l) ⇄ (CH3)2NH3^+(aq) + OH^-(aq)
What is a weak base?A weak base is one that does not ionize completely in solution. As such, a weak base will have a very low base dissociation constant Kb reflecting its minimal dissociation in solution.
The question is incomplete hence we are are unable to work out the equilibrium but in solution it will look like this;
(CH3)2NH(aq) + H2O(l) ⇄ (CH3)2NH3^+(aq) + OH^-(aq)
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The equilibrium for the reaction between (Ch₃)2NH of the weak base is (CH₃)2NH(aq) + H₂O(l) ⇄ (CH₃)2NH₃⁺(aq) + OH⁻(aq).
What are weak bases?A weak base is one that does not completely dissociate in water.
It leaves only a small proportion of hydroxide ions and the concerned basic radical in the resulting aqueous solution.
A large proportion of dissociated base molecules.
Thus, the equilibrium for the reaction is (CH₃)2NH(aq) + H₂O(l) ⇄ (CH₃)2NH₃⁺(aq) + OH⁻(aq).
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I have my last 3 electrons on the third energy level.
Answer:
an energy level represents the three dimensional space surrounding nucleus where electrons are most likely to be.
Explanation:
Which location represents a period on a periodic table?.
Based on the arrows, in which direction are air masses moving? from west to east from north to south toward the equator toward the middle latitude
Air masses are large air volume at constant humidity and a temperature it moves by convection in the atmosphere. The direction is from west to east.
What are the directions?Directions are the path or the points of something or an object. The earth has four major directions one towards the upper side called north, downwards called south, towards the left known as the west, and towards the right called east.
The image shows the movements of the arrow from the left to the right side. On the left is, the west and towards the right is the east.
Therefore, option a. from west to east is the movement of the air masses.
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There is an extreme temperature difference between day and night in a desert during clear weather. However, even though the outside temperature drops greatly at night, the water in a swimming pool in the desert tends to remain warm. Use your knowledge of heat energy, specific heat, and heat transfer to explain these facts.
please help!!!!!!
Sand has a lower heat capacity hence it heats up easily and looses heat easily. On the other hand, water has a higher heat capacity and looses heat more slowly hence it remains warm at night.
What is heat transfer?The transfer of heat refers to the movement of heat from one body to another. We should note that sand has a low specific heat capacity hence it is rapidly heated up in the day and looses heat quickly at night.
On the other hand, water has a high specific heat capacity hence it heat up slowly and also does not loose heat easily even when the surrounding temperature is much colder. As such, there is an extreme temperature difference between day and night in a desert during clear weather and the water in a swimming pool in the desert tends to remain warm even when the outside temperature drops greatly at night.
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What is the difference between sulphur and sulphur molecules
The use of evaporation and condensation to separate the partsof a mixture is called _____
Answer: Evaporation Condensation is used to seperate the parts of a mixture
Explanation: This is because it is the first order of the distilation process
The use of evaporation and condensation to separate the parts of a mixture is called distillation.
What is distillation?
Separating salt water to produce pure water and salt is an example of a simple distillation mixture.
The water begins to evaporate during the distillation process, and the vapor cools down to form pure water.
A second container is used to collect the pure water.
Thus, the use of evaporation and condensation to separate the parts of a mixture is called distillation.
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Periodic Table: Why are group 1A elements called alkali metals?
Answer:
Explanation:
The elements in Group I of the periodic table are called alkali metals. They are called alkali metals because they react with water to form alkali solutions. These metals are very reactive; hence they have to be stored under oil to protect them from corrosion by air and waterwaterwater
The group 1A elements, called alkali metals because they form alkalies on reacting with water. Alkalies are strong bases.
What are the alkali metals?They are the metals that are soft, lustrous, and have a low melting point. Air and moisture react readily with alkali metals.
Special precautions must be taken when using and storing these metals due to their reactivity.
The seven alkali metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Thus, the group 1A elements, called alkali metals because they form alkalies on reacting with water. Alkalies are strong bases.
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Green gram defination
For grade 7
a leguminous plant, Phaseolus aureus, whose seeds are used as food in India.
Answer:
Green Gram is a small round edible green bean which is also known as moong ki daal in the subcontinent.
Explanation:
The green gram bean which is also known as the mung, maash or moong, is a plant species in the legume family. The green gram bean is mainly cultivated in East, Southeast and South Asia. It is used as an ingredient in both savoury and sweet dishes.
What does it mean a solution is a weak base"? What about a "Strong base"? Give logical pH values for each
Answer:
A weak base is a base that, upon dissolution in water, does not dissociate completely, so that the resulting aqueous solution contains only a small proportion of hydroxide ions. PH 7-10
A strong base is a base that is completely dissociated in an aqueous solution. a PH of about 12-14
During Taylor's experiment, which piece of data would be qualitative?
mass of the cars
degree of the ramp incline
time in seconds
none are qualitative
From the available options with respect to Taylor's experiment, none of the data is qualitative.
Qualitative dataThese are data that cannot be measured using any instrument or assigned a numerical value.
Qualitative data are observable data based on perception.
This is unlike quantitative data that can be measured using relevant instruments and assigned numeric figures.
Mass can be measured in grams using a weighing balance, angle of inclination can be measured using relevant instruments, and time can be measured using a stopwatch.
Thus, none of the options is qualitative.
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Answer:
None are Qualitative
Explanation: I took the test and got a 100%
The volume of a certain gas is 29.3 liters at STP. what would the volume of the same gas at 1.39 atmospheres and -23.0℃?
A. 23 L
B. 37.3 L
C. 19.3 L
D. 22.4 L
Option C) 19.3L is the correct answer.
Hence, the final volume of the gas at the standard atmospheres and temperature is 19.3L.
Given the data in the question;
Initial volume of gas; [tex]V_1 = 29.3L[/tex]At Standard temperature and pressure( STP)
Initial temperature; [tex]T_1 = 273.15K[/tex]Initial pressure; [tex]P_1 = 1.00atm[/tex]Then
Final pressure; [tex]P_2 = 1.39atm[/tex]Final temperature; [tex]T_2 = -23.0^0C = 250.15K[/tex]Final Volume; [tex]V_2 = \ ?[/tex]
Combined gas lawCombined gas law combines both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
To determine the new volume of the gas, we substitute our values into the expression above.
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\1.00atm * 29.3L * 250.15K = 1.39atm * V_2 * 273.15K\\\\7329.395atm.L.K = 379.6785atm.K * V_2\\\\V_2 = \frac{7329.395atm.L.K}{379.6785atm.K} \\\\V_2 = 19.3L[/tex]
Option C) 19.3L is the correct answer.
Hence, the final volume of the gas at the standard atmospheres and temperature is
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Draw the structure of the major nitration product from the reaction of nitric acid with 1,3‑dimethylbenzene. Show all formal charges
The 2,4 and 5 positions are accessible for nitration of 1,3‑dimethylbenzene. The final product is shown in the image attached.
What is nitration?Nitration is a type of reaction in which the nitro group (-NO2) is introduced to an aromatic ring. We have to note that in the compound 1,3‑dimethylbenzene, the 2,4 and 5 positions are accessible for nitration as shown.
Hence, the nitration of 1,3‑dimethylbenzene occurs as shown in the image attached with the compound shown being the major product.
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The structure of the major nitration product from the reaction of nitric acid with 1,3‑dimethylbenzene is shown in attached image.
What is nitration?Nitration is a process in which addition of nitro group (-NO₂) is taking place on the substrate molecule.
In the given question 1,3‑dimethylbenzene is the susbtarte in which nitration will be done in the presence of sulphuric acid (H₂SO₄) and nitric acid (HNO₃). Methyl groups which are present in the substrate molecule will behave as an ortho para directing groups as they are electron donating groups. So the major product obtained in the reaction is shown below in image.
Hence the structure of major nitration product is shown below in image.
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HELLO MAY I GET HELP AGAIN?
Answer:
( c ) sunlight.
Explanation:
the leaves are closer to the sunlight they require.
is the soda ginger ale(canada dry) a weak acid or a strong acid? why
Answer:
Ginger ale is a strong acid
Explanation:
This is because of the high amounts of carbonic acid that it contains, putting it below the 4.6 Ph threshold.
You are pulling an object up 1 m with a 5 m ramp. You pull
with 20 N of force.
How much does the object weigh?
For an object 1 m long with a 5 m ramp, You pull with 20 N of force, The weight of the object is mathematically given as
W= 5714.3 N
What is the weight of the object ?Generally, the equation for the weight is mathematically given as
W = mg = F/Sinθ
W= 20/Sin0.2
W=20/ 0.0035
W= 5714.3 N
In conclusion, the weight of the object
W= 5714.3 N
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The reaction between alcohols and carboxylic acids is called
Explanation:
When a carboxylic acid is treated with an alcohol and an acid catalyst, an ester is formed (along with water). This reaction is called the Fischer esterification.
The reaction between alcohols and carboxylic acids is called Fischer esterification.
What is Fischer esterification?Fischer Esterification is an organic reaction that produces an ester by converting carboxylic acids in the presence of excess alcohol and a strong acid catalyst.
This ester is created in the presence of water.
Thus, the reaction between alcohols and carboxylic acids is called Fischer esterification.
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Mercury(ii) oxide (hgo) decomposes to form mercury (hg) and oxygen (o2). the balanced chemical equation is shown below. 2hgo right arrow. 2hg o2 the molar mass of o2 is 32.00 g/mol. how many moles of hgo are needed to produce 250.0 g of o2? 3.906 moles 7.813 moles 15.63 moles 73.87 moles
Decomposition reaction results in the formation of the products by splitting the reactants. Moles of mercury(ii) oxide needed are 15.63 moles.
What are moles?Moles are the ratio of mass and the molar mass of the compound or the molecule.
Moles of oxygen are calculated as:
[tex]\begin{aligned}\rm n &= \rm \dfrac {mass}{molar\; mass}\\\\&= \dfrac{250}{32}\\\\&= 7.8125 \;\rm moles\end{aligned}[/tex]
The balanced chemical reaction can be shown as,
[tex]\rm 2HgO \rightarrow 2Hg + O_{2}[/tex]
From the reaction, it can be said that 1 mole of oxygen requires 2 moles of mercury oxide.
Moles of mercury oxide are calculated as:
[tex]\begin{aligned} \rm n HgO& = (7.8125 \;\rm moles \; O_{2}) \times (\dfrac{2 \;\rm moles\; HgO}{1 \;\rm mole \; O_{2}})\\\\\rm n HgO &= 15.625 \;\rm moles \end{aligned}[/tex]
Therefore, option C. 15.63 moles of mercury (II) oxide is needed.
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Which equation shows conservation of both mass and charge?
(1) Cl2 + Br→ Cl- + Br,
(2) Cu + 2 Agt → Cu2+ + Ag
(3) Zn + Cr3+ → Zn2+ + Cr
(4) Ni + Pb2+ → Ni2+ + Pb
The equation that shows conservation of both mass and charge is:
(4) Ni + Pb²⁺ → Ni²⁺ + Pb
What do conservation of mass and conservation of charge stand for?Conservation of mass: there is the same mass, i.e. same number of atoms, in the reactants and in the products.Conservation of charge: there is the same electrical charge in the reactants and in the products.Which equation shows conservation of both mass and charge?
(1) Cl₂ + Br → Cl⁻ + Br
No, the equation does not show conservation of mass nor charge.
(2) Cu + 2 Ag⁺ → Cu²⁺ + Ag
No, the equation does not show conservation of mass.
(3) Zn + Cr³⁺ → Zn²⁺ + Cr
No, the equation does not show conservation of charge.
(4) Ni + Pb²⁺ → Ni²⁺ + Pb
Yes, the equation show conservation of mass and charge.
The equation that shows conservation of both mass and charge is:
(4) Ni + Pb²⁺ → Ni²⁺ + Pb
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Calculate the volume of 1.5 M nitric acid required to neutralize 30.0 mL of 7.0 M sodium
hydroxide.
HNO3 (aq) + NaOH (aq) → H2O (l) + NaNO3 (aq)
Answer:
0.14 liters nitric acid
Explanation:
Molarity = moles / liter
7.0 M = x / 0.03 L
= 0.21 moles NaOH
0.21 moles NaOH x ( 1 mole HNO3 / 1 mole NaOH) = 0.21 moles HNO3
Molarity = moles / liter
1.5 M = 0.21 moles / x
x = 0.21 moles / 1.5 M
x = 0.14 Liters HNO3
Answer:
[tex]140mL[/tex]
Explanation:
[tex]M_1V_1=M_2V_2[/tex]
[tex]M_1=1.5M[/tex] molarity of nitric acid
[tex]V_1=?[/tex] volume of nitric acid
[tex]M_2=7.0M[/tex] molarity of sodium hydroxide
[tex]V_2=30.0mL[/tex] volume of sodium hydroxide
[tex](1.5M)(V_1)=(7.0M)(30.0mL)[/tex]
[tex]V_1 =\frac{(7.0M)(30.0mL)}{1.5M}=140mL[/tex]
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At what number carbon does the phosphate group connect to the sugar?.
The phosphate group attached to the 5' carbon of the sugar on one nucleotide forms an ester bond with the free hydroxyl on the 3' carbon of the next nucleotide.
Why are flood plains desirable farm land in spite of the fact that they are prone to flooding?.
Flood plains are desirable farm land in spite of the fact that they are prone to flooding because of its high fertility.
Why are floodplains desirable farm land?Floodplains are very fertile agricultural areas because the floods carry nutrient-rich silt and sediment and deposited it that plains. Floodplains are flat which make easier farming.
So we can conclude that flood plains are desirable farm land because of its high fertility.
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Which of the following statements about minerals and ores is true?
Answer:
please give a photo I can't now to help u
Answer:
they have a crystalline structure is the correct answer <3
Explanation:
Suppose you’re out of acetic acid (ch3cooh) and decide to use ethanol (ch3 ch2oh) as the solvent in the transformation of 3 into 4. Would this be a wise choice, and why?
The use of ethanol instead of acetic acid is not the wise choice.
Why use of ethanol instead of acetic acid is not the wise choice?When you are out of acetic acid and decide to use ethanol as the solvent in the transformation, it would not be a wise choice because acetic acid and ethanol are two totally different chemicals. Due to different in features, it can't act the same and the desirable results can't be observed.
So we can conclude that use of ethanol instead of acetic acid is not the wise choice.
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To use ethanol in place of acetic acid as a solvent in the transformation of 3 into 4, is not a wise choice.
What are functional groups?Functional groups are the specific groups which after attaching to any molecule changes the property of the molecule.
Acetic acid has carboxylic (-COOH) group as functional group and ethanol has hydroxyl (-OH) functional group and both has different properties from each other. So use to ethanol in place of acetic acid is not correct as it will not fulfill the requirements of acid.
Hence use of ethanol in place of acetic acid is not a wise choice.
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Given that delta.g for the reaction below is –957.9 kj, what is delta.gf of h2o? 4nh3(g) 5o2(g) right arrow. 4no(g) 6h2o(g) delta.gf,nh3 = -16.66 kj/mol delta.gf,no = 86.71 kj/mol –228.6 kj/mol –206.4 kj/mol 46.7 kj/mol 90.7 kj/mol
The valur of energy of formation ΔGf of H₂O is -228.6 kJ/mol.
How we calculate ΔG ?ΔG of any reaction will be calculated as:
ΔG = Sum of ΔG of products - Sum of ΔG of reactants
Given chemical reaction is:
4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)
For this reaction, ΔG will be calculated as:
ΔG = [ΔGf 4(NO) + ΔGf 6(H₂O)] - [ΔGf 4(NH₃) + ΔGf 5(O₂)]
Given that:
ΔG = -957.9 kJ
ΔGf of NH₃ = -16.66 kJ/mol
ΔGf of NO = 86.71 kJ/mol
ΔGf of O₂ = 0 (because it is present in elemental form)
ΔGf of H₂O = let x (to find)
On putting all these values on the above equation, we get
-957.9 = [4(86.71) + 6(x)] - [4(-16.66) + 5(0)]
-957.9 = 346.84 + 6x + 66.64
6x = -957.9 - 346.84 - 66.64
6x = -1,371.38
x = -228.56 = -228.6 kJ/mol
Hence, correct option is (1) i.e. -228.6 kJ/mol.
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Answer:
A) -228.6 kJ/mol
Explanation:
EDGE 2022