Answer:
It comes from the sun.
Select the pair in which former is stronger nucleophile than latter in polar aprotic solvent
The pair in which former is stronger nucleophile than later in polar aprotic solvent is CH₃NH₂ and (CH₃)₂NH. The correct option is A.
What is nucleophile and polar aprotic solvent?Nucleophiles are molecules that have a pair of electrons that can be shared. They are also called electron rich species.
Polar aprotic solvents are incapable of forming hydrogen bonds with the substrate. They don't have any hydrogen atoms directly connected to an electronegative atom, so they can't form a hydrogen bond.
Acetone, chloroform, dichloromethane, and other aprotic solvents are examples.
Thus, the correct option is A. CH₃NH₂ and (CH₃)₂NH.
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What unit of mass measurement would I use to measure a vitamin pill?
Answer: Milligrams
Explanation:
Vitamins are measured in Milligrams because if used grams, there would be a higher dose.
What is the cell reaction for the voltaic cell cr(s) | cr3 (aq) || cl–(aq) | cl2(g) | pt?
The cell reaction for the voltaic cell is 2Cr(s) + 3Cl₂(g) → 2Cr₃ + (aq) + 6Cl⁻ (aq). The correct option is d.
What is a voltaic cell?A voltaic cell is an electrochemical cell that generates electricity through a chemical reaction.
A voltaic cell's most important components are: The anode is an electrode that undergoes oxidation. The cathode is an electrode that undergoes reduction.
Thus, the correct option is d, 2Cr(s) + 3Cl₂(g) → 2Cr₃ + (aq) + 6Cl⁻ (aq).
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HELP!
5. From which location in the image would
a concert viewer experience the sound
waves with the greatest intensity?
A. location A
B. location B
C. location C
Which of the following is the equation for wave speed?
Answer:
b
Explanation:
b is the answer to your question
which type of bond does this molecule show?
A. hydrogen bond
B. ionic
C. Double covalent
D. magnetic bond
A solution is prepared by dissolving 7. 31 g of na2so4 in enough water to make 225 ml of solution. Calclate the solutions molarity
The molarity of solution which is prepared by dissolving 7. 31 g of Na₂SO₄ in enough water to make 225 ml of solution is 0.22M
How do we calculate molarity?Molarity of the solution will be calculated by using the below equation as:
M = n/V, where
V = volume of solution = 225mL = 0.225Ln is the moles of solute which can be calculated as:n = W/M, where
W = given mass of Na₂SO₄ = 7.31gM = molar mass of Na₂SO₄ = 142g/moln = 7.31/142 = 0.05 mol
On puttig values, we get
M = 0.05 / 0.225 = 0.22M
Hence required molarity is 0.22M.
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he students in the picture below are using a globe and a lamp to model the Sun and the Earth.
If the model Earth acts the same as the real Earth, what will happen as the students spin the model?
A.
A new year will start each time the model Earth makes a complete turn.
B.
Different parts of the model Earth will have different seasons.
C.
All of the model Earth will have daytime at the same time.
D.
Some parts of the model Earth will have daytime and some will have night.
Answer:
D
Explanation:
1/2 will be lit with 'daylight' and the other half will be dark
What is the volume of 100 g of H2 gas?
Answer: Volume of H2 gas is 30.576 Litres
Explanation:
The reaction between HCl and Zn is as follows:
Moles of HCl = 100/36.5 = 2.73 moles
Moles of Zn = 100/65 = 1.53 moles
As per Reaction and available reagents , HCl is the limiting reagent.
So, we can say that :
2 moles HCl gives 22.4 L of H2 gas.
=> 2.73 moles of HCl gives
So, final answer is:
Volume of H2 gas is 30.576 Litres.
Science edpuzzle
Which of the following are some examples of a chemical change? Select all the apply
Answer:
the 3 in the middle
Explanation:
There are 5 signs of chemical changes these are odor change,color change, temperature change, production of gas and creation of precipitation.
When chlorine gas is bubbled into an aqueous solution of potassium iodide, the colourless solution turns brown.
i) Write an ionic equation for the reaction that takes place
ii) What is the name given to this type of reaction?
iii) Why does the solution turn brown?
Answer:
When chlorine (Cl 2 ) gas is passed through an aqueous solution of potassium iodide (KI), the products formed are solid iodine (I2) and potassium chloride (KCl). This is a displacement reaction in which the less reactive iodine in potassium iodide is displaced by the more reactive chlorine. The equation can be written as:
2KI(aq)+Cl2(g)→2KCl(aq)+I2 (s)
How many molecules are contained in 3 moles of water molecules , h2o?
Answer:
Explanation:
By definition 3 moles of water molecules. Or about 3 * 6.022140E23 water molecules = 1.806642E24 water molecules.
hope this is right..
Answer: Simply multiply Avogadro's number(6.02x10^23) by 3 and that's your answer. Use a scientific calculator
Explanation:
Chandra wants to know how many moles are contained in 150.0 g ccl4 (carbon tetrachloride). what quantity of ccl4 should she use to make this conversion? number of moles the number of atoms molar mass mole ratio
The quantity of carbon tetrachloride, CCl₄ she will use to make her conversion is molar mass
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mole of CCl₄Mass of CCl₄ = 30 gMolar mass of CCl₄ = 12 + (35.5×4) = 154 g/mol Mole of CCl₄ =?Mole = mass / molar mass
Mole of CCl₄ = 150 / 154
Mole of CCl₄ = 0.974 mole
Thus, we can see that the molar mass of CCl₄ is needed to obtain the number of mole.
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what do you think might be different between fat molecules and carbohydrate and protein molecules?
Answer:
Long answer
Proteins are the building blocks of the body, each and every organ muscle and skin and cells are made of proteins. They can also be used for providing energy to the body in a state where other energy sources aren't available.
Fats are stored energy blocks which can be used by the body at its own convenience whenever there is a deficit of energy in the body. They can also be directly burnt to give energy in cases where energy needs of the body are not met by dietary intake
Carbohydrates are the most convenient and preferable source of energy in the body and are easily converted to give out immidiate energy to the body, excess carbohydrates can be converted into fats and stored for later usage as and when required by the body.
Proteins, fats and carbohydrates have many secondary functions and roles in the human body. If you are keen to know anything more specific feel free to ask.
Short answer :Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.
Answer:
Most Nutrients are digested into easy and simpler compounds. Carbohydrates are used for energy . Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.
What is nourishing for a seed of a plant?
if .296 j of heat causes a .661 degree c temperature change, what mass of water is present?
Answer:
m=0.000107 kg
Explanation:
H=m*cp*change in temperature
0.296=m*4182*0.661
m=0.000107 kg
Which of the following statements correctly explains how latitude affects temperature?
1.Places that are closer to the equator receive more direct sunlight and have warmer temperatures.
2.The equator is an imaginary line drawn around the middle of the earth but has nothing to do with temperature.
3.laces that are far from the equator have warmer temperatures.
Answer:
It's 1, places that are closer to the equator receive more direct sunlight and have
Explanation:
When small pieces of manganese oxide were added to a solution of hydrogen peroxide, water and oxygen were produced. Manganese oxide was not used up in the reaction. Which of the following is likely to increase the rate of the reaction?
A) Reducing the number of pieces of manganese oxide used
B) Increasing the amount of solution
C) Using one cube of equal mass of manganese oxide
D) Chilling the hydrogen peroxide solution
The change which increase the rate of the reaction is by increasing the amount of solution.
What is the rate of the reaction?Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of the products.
Given chemical reaction is:
2H₂O₂ [tex]\overset{MnO_{2}}{\rightarrow}[/tex] 2H₂O + O₂
In the above chemical reaction MnO₂ acts as a catalyst which helps in increasing the rate of the reaction without being involved in the reaction. So the formation of the product depends only on the concentration of the solution. So, by increasing the solution amount will increase in the rate.
Hence, increasing the amount of solution will increase the rate.
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Answer:
B. increasing the amount of solution
Explanation:
took the test:)
Temperature
to measure the movement of particies such as atoms and molecutes. As temperature increases, what is always true of the particles in a substance?
O The rate of movement increases.
O The distance between them decreases.
O The attraction between them increases
© The rate of reaction decreases.
Which one of the following substances would be the most soluble in ccl4?
One of the following substances would be the most soluble in CCl₄ is C₄H₁₀.
What is CCl₄?CCl₄ is carbon tetra chloride is an organic compound with a sweet smell and colorless liquid.
It is used in liquid for refrigerator, as a pesticide, a propellant for aresol cans and in fire extinguisher, but it is very a harmful substance that why it is banned.
Thus, the substances would be the most soluble in CCl₄ is C₄H₁₀.
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Why is cellular reparation important for cells?
What is the pressure of 0.33 moles of nitrogen gas, if its volume is 15.0 L at –25.0oC?
Using the ideal gas law PV =nRTPV=nRT , we find that the pressure will be P =\frac{nRT}{V}P=
V
nRT
. Then, we'll substitute and find the pressure, using T = -25 °C = 248.15 K and R = 0.0821 \frac{atm\cdot L}{mol \cdot K}
mol⋅K
atm⋅L
:
P =\frac{nRT}{V} = \frac{(0.33\,\cancel{mol})(0.0821\frac{atm\cdot \cancel{L}}{\cancel{mol \cdot K}})(248.15\,\cancel{K})}{15.0\,\cancel{L}} = 0.4482\,atmP=
V
nRT
=
15.0
L
(0.33
mol
)(0.0821
mol⋅K
atm⋅
L
)(248.15
K
)
=0.4482atm
In conclusion, the pressure of this gas is P=0.4482 atm.
Reference:
Chang, R. (2010). Chemistry. McGraw-Hill, New York.
Art a the ph of a 0. 25 m aqueous solution of hydrofluoric acid, hf, at 25. 0 °c is 2. 3. What is the value of ka for hf
The value of [tex]K_{a}[/tex] for HF is, 3.5 x [tex]10^{-4} M[/tex]
What is an aqueous solution?The aqueous solution definition means simply that something has been dissolved in water. The aqueous symbol is (aq). Aqueous solution definition: something is dissolved in water.
Solution : Given,
pH = 2.03
Concentration of HF = 0.25 M
First, we have to calculate the concentration of [tex]H^{+}[/tex] ion.
pH=-log [[tex]H^{+}[/tex]]
2.03=-log [[tex]H^{+}[/tex]]
[tex]H^{+}[/tex]= 9.3 x [tex]10^{-3} M[/tex]
Now we have to calculate the value of [tex]K_{a}[/tex] for HF.
The equilibrium reaction will be:
[tex]HF\leftrightharpoons \ H^{+}+F^{-}[/tex]
Concentration of [tex]H^{+}[/tex] = Concentration of [tex]F^{-}[/tex]= 9.3 x [tex]10^{-3} M[/tex]
The expression of [tex]K_{a}[/tex] for HF will be,
[tex]k_{a} =\frac{[F]^{-} [H]^{+} }{HF}[/tex]
[tex]K_{a}[/tex] = 3.5 x [tex]10^{-4} M[/tex]
Therefore, the value of [tex]K_{a}[/tex] for HF is, 3.5 x [tex]10^{-4} M[/tex]
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Chemical energy is converted directly into electrical energy in.
[tex]\huge{\green}\fcolorbox{blue}{cyan}{\bf{\underline{\red{\color{red}Answer}}}} [/tex]
galvanic cell.What happens when the temperature of the air cools.
Sorry this is late but the molecules in the substance will move much slower and take up less place as a molecule that moves faster will take up more space
Hope this helps :))
What is the ph of a solution that has a [h ] = 0. 0039 m?
The pH of a solution that has a H⁺ ion concentration is 0.0039M is 2.4.
What is pH?pH of any solution gives idea about the acidity or basicity of solution and it will be calculated as:
pH = -log[H⁺]
Given that, concentration of H⁺ ion = 0.0039 M
On putting tis value in pH equation, we get
pH = -log(0.0039)
pH = -(-2.4) = 2.4
Hence required value of pH is 2.4.
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Voltage-gated sodium channels are sensitive to changes in the extracellular concentration of
Voltage-gated sodium channels are the ion channels that conduct sodium ions. They are sensitive to the extracellular concentration of calcium ions.
What are Voltage-gated sodium channels?Voltage-gated sodium channels are the signaling ion channels that are responsible for increasing the action potential of the nerve cells. VGSC is the most important resting and action potential of the cell.
These channels are sensitive to the high concentration of calcium ions as these ions cause the channels to open up on the membrane surfaces of the cell. This causes a change in the concentration of the gradient across the membrane.
Therefore, VGSC is sensitive to calcium ions.
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How much heat energy is required to raise the temperature of 50g of bromine from 25°C to 30°C? [Specific heat capacity of bromine = 0.226 J/(g°C]
Answer: 56.5 J
Explanation:
How many grams of carbon dioxide are produced when 16 g of methane and 48 g of oxygen gas combust
Which statement is true for a solution when its concentration of hydroxide ions becomes equal to the concentration of hydronium ions?
It becomes more acidic.
It becomes more alkaline.
Its pH becomes equal to 0.
Its pH becomes equal to 7.
When for a solution concentration of hydroxide ions becomes equal to the concentration of hydronium ions, its pH becomes equal to 7.
What is pH?pH of any solution is used to define the acidity, basicity or neutrality of the solution.
pH ranges from 0 to 6.9 shows acidity.pH 0 shows the neutrality.pH ranges from 7.1 to 14 shows the basicity.When the concentration of hydronium ion is equal to the concentration of the hydroxide ion then the resultant solution will be neutral, as they have a pH equals to 0.
Hence, pH of the solution becomes equal to 7.
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