Answer:
the answer is B:) have a good day
chemist must prepare of hydrochloric acid solution with a pH of at . He will do this in three steps: Fill a volumetric flask about halfway with distilled water. Measure out a small volume of concentrated () stock hydrochloric acid solution and add it to the flask. Fill the flask to the mark with distilled water. Calculate the volume of concentrated hydrochloric acid that the chemist must measure out in the second step. Round your answer to significant digits.
Answer:
1.7mL of the stock solution
Explanation:
...Must prepare 550.0mL with a pH of 1.60 at 25°C
...Fill a 550.0mL volumetric flask
...Concentrated stock of 8.0M
... Round the answer to 2 significant digits
First, with pH we can solve [H⁺] = [HCl] concentration that we need to prepare the solution:
pH = -log[H⁺]
1.60 = -log[H⁺]
10^-1.60 = [H⁺]
0.0251M = [H⁺]
That means we need to dilute the concentrated solution from 8M to 0.0251M, that is:
8M / 0.0251M = 318.5 times
As the final volume of the solution is 550.0mL, the volume of the stock 8M HCl solution must be:
550.0mL / 318.5 times =
1.7mL of the stock solutionA hydroelectric power station, like the hoover dam, produces electrical energy from
nuclear
chemical
electrical
mechanical/kinectic
I NEED HELP ASAP
Imagine you live next door to your best friend. Your bedroom windows face each other, and you want to set up a way to communicate privately using waves. You have these supplies:
a long string
a spring toy long enough to stretch between your windows
metal cans
a Morse code alphabet decoder (Morse code is a system that represents letters of the alphabet with dots and dashes)
You can use as many of these supplies as you want.
Answer:
then use those and set up one
Explanation:
Answer:
the string and the cans for me. its like your own phone
Explanation:
Question 4
Consider heptane, a linear compound composed of 7 carbons and 16
hydrogens. In this experiment, would you expect this compound to have
a small or large retention factor in this experiment?
Answer:
The retention factor would be high
Explanation:
The retention factor can be affected by the temperature, or affected by the composition of the solvent, when the FM are liquid.
Heptene is a derivative of the distillation of oil, it is a chemical compound that is made up of seven carbons, that is why it begins with the prefix hept.
1- A sample of Ne(g) has a volume 250 mL at 752 mm Hg. What is the
new volume if the temperature and amount of gas held constant, the
pressure is;
a) lowered to 385 mm Hg.
b) Increased to 3.68 atm
Answer:
A. 488.31 mL.
B. 67.22 mL.
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 250 mL
Initial pressure (P₁) = 752 mm Hg
A. Determination of the new volume when the pressure is lowered to 385 mmHg.
Initial volume (V₁) = 250 mL
Initial pressure (P₁) = 752 mm Hg
Final pressure (P₂) = 385 mmHg
Final volume (V₂) =?
P₁V₁ = P₂V₂
752 × 250 = 385 × V₂
188000 = 385 × V₂
Divide both side by 385
V₂ = 188000 / 385
V₂ = 488.31 mL
Thus, the new volume of the gas is 488.31 mL
B. Determination of the new volume of the gas when the pressure is increased to 3.68 atm.
Initial volume (V₁) = 250 mL
Initial pressure (P₁) = 752 mm Hg
Final pressure (P₂) = 3.68 atm.
Final volume (V₂) =?
Next, we shall convert 3.68 atm to mmHg. This can be obtained as follow:
1 atm = 760 mmHg
Therefore,
3.68 atm = 3.68 atm × 760 mmHg / 1 atm
3.68 atm = 2796.8 mmHg
Thus, 3.68 atm is equivalent to 2796.8 mmHg.
Finally, we shall determine the new volume of the gas as follow:
Initial volume (V₁) = 250 mL
Initial pressure (P₁) = 752 mm Hg
Final pressure (P₂) = 2796.8 mmHg.
Final volume (V₂) =?
P₁V₁ = P₂V₂
752 × 250 = 2796.8 × V₂
188000 = 2796.8 × V₂
Divide both side by 2796.8
V₂ = 188000 / 2796.8
V₂ = 67.22 mL
Thus, the new volume of the gas is 67.22 mL
How do I arrange these from greatest to least?
-4.29 x 10^-5
-1.370 x 10^6
-9.3 x 10^-2
Answer:
-4.29 x 10^-5, -9.3 x 10^-2, and then the least is -1.370 x 10^6
Explanation:
-9.3 x 10^-2 = -0.093-4.29 x 10^-5 = -0.0000429-1.370 x 10^6 = -1,370,000Now use common sense.
-0.093 is the greatest number.
Then -429,000 is in the middle.
Lastly, -1,370,000 is the least number.
So -0.0000429 > -0.093 > -1,370,000Why?
Because as a negative number gets bigger, the more least the number is. It is the opposite of positive numbers. For positive numbers, as a number gets bigger, the more greater the number is. That is a rule.
Hope it helped!
The questions are attached
Answer:
Explanation:
a) Balanced chemical equation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
b) Mass of oxygen gas needed = ?
Mass of propane = 25 g
Solution:
Number of moles of propane = mass/molar mass
Number of moles = 25 g/ 44.1 g/mol
Number of moles = 0.57 mol
now we will compare the moles of oxygen and propane:
C₃H₈ : O₂
1 : 5
0.57 : 5/1×0.57 = 2.85 mol
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 2.85 mol × 32 g/mol
Mass = 91.2 g
c) water vapors produced = ?
Mass of propane = 25 g
Solution:
Number of moles of propane = mass/molar mass
Number of moles = 25 g/ 44.1 g/mol
Number of moles = 0.57 mol
now we will compare the moles of water and propane:
C₃H₈ : H₂O
1 : 4
0.57 : 4/1×0.57 = 2.28 mol
Mass of water vapors:
Mass = moles × molar mass
Mass = 2.28 mol × 18 g/mol
Mass = 41.0 g
d)
mass of water vapors produced = 1.5 kg (1500 g)
Mass of propane reacted = ?
Solution:
Number of moles of water vapors:
Number of moles = mass/molar mass
Number of moles = 1500 g/ 18 g/mol
Number of moles = 83.33 mol
now we will compare the moles of water and propane.
H₂O : C₃H₈
4 : 1
83.3 : 1/4×83.3 = 20.8 mol
Mass of propane:
Mass = number of moles ×molar mass
Mass = 20.8 mol × 44.1 g/mol
Mass = 917 g
Which phrase describes conduction?
transfer of heat between two objects that are touching
transfer of heat by the actual movement of warmed matter
the process in which energy is released by molecules breaking apart
the process in which energy is emitted by one object, transmitted through space, and absorbed by another
Answer:
Transfer of heat between two objects that are touching.
Explanation:
Conduction is the process by which heat is transferred from one object to another object that is touching and has different temperatures.
Eg: We can use a hot water pack to warm our back. Or While cooking we can feel the conduction process when heat process from the bottom of the pan to the top of the pan
Answer:
A. Transfer of heat between two objects that are touching
Explanation:
1.03 Quiz: Three Kinds of Heat Transfer
I am in K12
The moons of Jupiter
orbit Jupiter because
they are pulled toward
Jupiter. The moons of
Jupiter are too far to
be pulled into Earth's
orbit.
Yes or No
Answer:
Yes
Explanation:
Jupiter is a very large planet. Larger planets usually have stronger gravity, which pulls planets toward each other.
The moons of Jupiter are by Jupiter. (I know, that wasn't a smart thing to say because you know that, but, hey, I had to.) With this being the case, Jupiter is also an inside planet.
- Inside Planets
Planets that are closest to the sun and orbits the sun
There are 2 things that are the cause of the moons of Jupiter not being pulled by earth.
1. Jupiter has strong gravity which pulls the moons, and Jupiter is being pulled by the sun's INCREDIBLE gravity.
2. Earth is an outside planet. It is too far away from Jupiter to attract Jupiter's moons.
- Outside Planet
A planet that is away from the sun, but still orbits the sun
Hope this helps! :D
If you want to know more about the sun, just call on me!!!!
Yes, The moons of Jupiter orbit Jupiter because they are pulled toward Jupiter. The moons of Jupiter are too far to be pulled into Earth'orbit.
What is orbit ?A planet's orbit around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved objects that follow this path.
A planet's orbit around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved trajectories in celestial mechanics known as orbits.
Around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved objects that follow this path.
Yes, The moons of Jupiter orbit Jupiter because they are pulled toward Jupiter. The moons of Jupiter are too far to be pulled into Earth'orbit.
To learn more about orbit, follow the link;
https://brainly.com/question/18914648
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can u pls help me with this question
Answer:
A. liquid to gas
QUESTION 4
2 points
How many moles of atoms are in a 408.67 grams sample of iron? (Do not include units) Report your answer to 3 significant figures.
Moles of iron = 7.30
Further explanationGiven
mass of iron = 408.67 g
Required
moles of atoms
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
mol iron-Fe (Ar = 56 g/mol)
mol = mass : MW
mol = 408.67 g : 56
mol = 7.30
what is the molarity of a solution that is made by mixing 35.5 g of Ba(OH)2 in 325 ml of solution?
Answer:
[tex]M=0.638M[/tex]
Explanation:
Hello!
In this case, since the molarity of a solution is calculated by diving the moles of solute by the volume of solution in liters, we first compute the moles of barium hydroxide in 35.5 g as shown below:
[tex]n=35.5g Ba(OH)_2*\frac{1molBa(OH)_2}{171.34gBa(OH)_2}\\\\n=0.207mol[/tex]
Then, the liters of solution:
[tex]V=325mL*\frac{1L}{1000mL} =0.325L[/tex]
Finally, the molarity turns out:
[tex]M=\frac{0.207mol}{0.325L}\\\\M=0.638M[/tex]
Best regards!
A covalent bond forms when
3) An object accelerates 7.2 m/s2 when a
force of 4.0 Newtons is applied to it.
What is the mass of the object?
Answer:
0.56 kgExplanation:
The mass of the object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{4}{7.2} \\ = 0.5555555...[/tex]
We have the final answer as
0.56 kgHope this helps you
When heating a solution to boiling on a hot plate, start by ___________. Then, turn the heat to ___________to start. If necessary, __________after waiting about ten minutes without seeing boiling.
Answer:
1. starting and stabilizing the stir function
2. a medium heat
3.turn up the heat setting
Explanation:
A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.
Some of the laboratory apparatus (equipment) used for conducting a chemical reaction are conical flask, Bunsen burner, beaker, tongs, crucible, round bottom flask etc.
When heating a solution to boiling on a hot plate, start by starting and stabilizing the stir function. Then, turn the heat to a medium heat to start. If necessary, turn up the heat setting after waiting about ten minutes without seeing boiling.
The safety precautions that must be taken when heating a solution to boiling on a hot plate;
I. A proper inspection of the round bottom flask for cracks, irregularities or any imperfection.
II. Ensure you avoid heating the flask while it is closed.
III. When suspending the flask on a hot plate, you should ensure that you use a clamp for stability.
can u pls help me with this question
Answer:
B because they aren’t moving there solid and compacted
Explanation:
I am 5 million iq brainlest pls
The first stage of aerobic respiration is a series of biochemical reactions called the Calvin cycle.
True
False
Answer:
The answer is indeed true
Explanation:
The molar mass of CaO is 56.08 grams / mole. How many formula units are present in 1.50 moles of
CaO?
Select one:
a. 5.06 x 1025 formula units Cao
b. 84.1 formula units Cao
c. 2.49 x 10-24 formula units Cao
d. 9.03 x 1023 formula units Cao
Answer:
9.03 x 10²³formula units
Explanation:
Given;
Molar mass = 56.08g/mol
Number of moles = 1.5moles
Unknown:
Number of formula units present = ?
Solution:
To solve this problem, we should note that:
1 mole of a substance contains 6.02 x 10²³ formula units
1.5mole of CaO will contain 1.5 x 6.02 x 10²³ formula units
= 9.03 x 10²³formula units
Write equations for the reaction of the zwitterion of the amino acid glycine with HCl and with NaOH.
You work for a company that produces ultra-absorbent diapers. Suppose you added water to five different polymers (materials) and want to choose the best one for your diapers. Which of the following would you choose?
the polymer with the least hydrated mass
the polymer with the greatest hydrated mass
the polymer with the smallest difference between the initial and final masses
the polymer with the greatest difference between the initial and final masses
Answer:
it's the last one
Explanation:
i just did it
Answer:
D on edge
Explanation:
Which statement best describes the availability of nonrenewable energy resources?
O Their supplies will be completely used up within ten years.
O They are readily available in all countries.
O Their exact amounts are not currently known.
They are stored in primary forests around the world.
Answer:
C. Their exact amounts are not currently known.
Explanation:
The statement that best describes the availability of nonrenewable energy resources is that their exact amounts are not currently known.
What are non-renewable sources of energy?Non-renewable sources of energy are those sources that are subject to exhaustion from usage i.e. cannot replenish itself.
Non-renewable sources unlike their renewable counterparts are exhaustible because they don't replenish themselves over a short time.
Examples of non-renewable sources of energy are:
PetroleumcoalTherefore, the statement that best describes the availability of nonrenewable energy resources is that their exact amounts are not currently known.
Learn more about non-renewable sources at: https://brainly.com/question/3831884
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You need to make an aqueous solution of 0.247 M magnesium acetate for an experiment in lab, using a 250 mL volumetric flask. How much solid magnesium acetate should you add
Answer:
8.78 g of magnesium acetate, Mg(CH₃COO)₂
Explanation:
From the question given above, the following data were obtained:
Molarity of Mg(CH₃COO)₂ = 0.247 M
Volume of solution = 250 mL
Mass of Mg(CH₃COO)₂ needed =?
Next, we shall convert 250 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
250 mL = 250 mL × 1 L / 1000 mL
250 mL = 0.25 L
Next, we shall determine the number of mole of Mg(CH₃COO)₂ in the solution. This can be obtained as follow:
Molarity of Mg(CH₃COO)₂ = 0.247 M
Volume of solution = 0.25 L
Mole of Mg(CH₃COO)₂ =?
Molarity = mole /Volume
0.247 = Mole of Mg(CH₃COO)₂ / 0.25
Cross multiply
Mole of Mg(CH₃COO)₂ = 0.247 × 0.25
Mole of Mg(CH₃COO)₂ = 0.0618 mole
Finally, we shall determine the mass of magnesium acetate, Mg(CH₃COO)₂, needed to prepare the solution. This can be obtained as follow:
Molar mass of Mg(CH₃COO)₂ = 24 + 2[12 + (3×1) + 12 + 16 + 16]
= 24 + 2[12 + 3 + 44]
= 24 +2[59]
= 24 + 118
= 142 g/mol
Mole of Mg(CH₃COO)₂ = 0.0618 mole
Mass of Mg(CH₃COO)₂ =?
Mole = mass / Molar mass
0.0618 = Mass of Mg(CH₃COO)₂ / 142
Cross multiply
Mass of Mg(CH₃COO)₂ = 0.0618 × 142
Mass of Mg(CH₃COO)₂ = 8.78 g
Thus, 8.78 g of magnesium acetate, Mg(CH₃COO)₂, is needed to prepare the solution.
The specific rotation of (R) carvone is (+) 61°. The optical rotation of a sample of a mixture of R &S carvone is measured as (-) 23°. Which enantiomer is in excess and what is its enantiomeric excess? What are the percentages of (R) - & (S) - carvone in the sample
Answer:
See explanation
Explanation:
% optical purity = specific rotation of mixture/specific rotation of pure enantiomer * 100/1
specific rotation of mixture = 23°
specific rotation of pure enantiomer = 61°
Hence;
% optical purity = 23/61 * 100 = 38 %
More abundant enantiomer = 100% - 38 % = 62%
Hence the pure (S) carvone is (-) 62° is the more abundant enantiomer.
Enantiomeric excess = 62 - 50/50 * 100 = 24%
Hence
(R) - carvone = 38 %
(S) - carvone = 62%
Answer:
Explanation:
ee= -23/-61 × 100= 38%
S + R = 100%
S - R = 38%
Solve simultaneously;
S= 69% ( excess)
R= 100-69= 31%
Xander is gaining weight. Which best describes what he can do to prevent obesity? exercise every day and also make healthy choices in his diet excercise once a week but make no change in his diet exercise once a week and also make healthy choices in his diet exercise every day but make no change in his diet
Answer:
exercise every day and also make healthy choices in his diet
Explanation:
This is going to prevent Xander from getting more overweight and will help him lose some pounds.
This is also something I need to do lol
<3
Answer:
A
Explanation:
Exercise every day and also make healthy choices in his diet
A certain gas at 2oC and 1.00 atm pressure fills a 4.0 container. What volume will the gas occupy at 100oC and 780 torr pressure?
The final volume V₂=4.962 L
Further explanationGiven
T₁=20 + 273 = 293 K
P₁= 1 atm
V₁ = 4 L
T₂=100+273 = 373 K
P₂=780 torr=1,02632 atm
Required
The final volume
Solution
Combined gas law :
P₁V₁/T₁=P₂V₂/T₂
Input the value :
V₂=(P₁V₁T₂)/(P₂T₁)
V₂=(1 x 4 x 373)/(1.02632 x 293)
V₂=4.962 L
please help fast :/
how many moles are present in 60 grams of hydrochloric acid , HCI ?
a : 1.40 moles
b : 36.45 moles
c : 1.65 moles
d : 60 moles
Answer: C- 1.65 moles
Explanation:
HCl = 1 + 35.45 = 36.45 g/mol
In the following pair, determine whether the two represent resonance contributors of a single species or depict different substances. If two structures are not resonance contributors, explain why. Select the single best answer.
N-N ≡ N: and N=N=N:
Answer:
They are resonance contributors
Explanation:
Resonance structures are structures that differ only in the distribution or placement of electrons.
Considering the two structures, we can easily see that the two species have the same total number of bonds and electrons differing only in the distribution of these electrons.
Hence, they are resonance contributors.
Please help me I promise I will give brainliest!
Answer:
1. a b c
2. a
3. c
4. west to east
What is the PH of a 1.3×(10)^-9 M HBr solution?
pH solution = 8.89
Further explanationGiven
The concentration of HBr solution = 1.3 x 10⁻⁹ M
Required
the pH
Solution
HBr = strong acid
General formula for strong acid :
[H⁺]= a . M
a = amount of H⁺
M = molarity of solution
HBr⇒H⁺ + Br⁻⇒ amount of H⁺ = 1 so a=1
Input the value :
[H⁺] = 1 x 1.3 x 10⁻⁹
[H⁺] = 1.3 x 10⁻⁹
pH = - log [H⁺]
pH = 9 - log 1.3
pH = 8.89
Which statement about erosion is true? Most erosion occurs too slowly to observe. Most erosion occurs too quickly to observe, Erosion can happen very quickly or very slowly. It is not possible to measure erosion rates.
Answer:
Erosion can happen very quickly or very slowly.
e.g splash erosion occurs slowly while gulley erosion occurs very fast.
