Answer:
HF <==> H+ + F-
Ka = 6.8x10-4 = [H+][F-] / [HF]
6.8x10-4 = (x)(x) / 0.25 - x (assume x is small relative to 0.25 and ignore it to avoid using quadratic)
6.8x10-4 = x2 / 0.25
x2 = 1.7x10-4
x = 1.3x10-2 M (this is ~ 5.2% of 0.25 so our assumption above was not valid. We must use quadratic)
6.8x10-4 = x2 /0.25 - x
1.7x10-4 - 6.8x10-4 x = x2
Use quadratic to find x = 0.0127 M = [H+]
pH = -log H+ = -log 0.0127
pH = 1.90 so answer is probably 1.88(B)
Explanation:
Have a great day ahead" :)
A state government is trying to decide between using windmills or a nuclear
power plant. What advantage does nuclear power have over wind power?
O A. Nuclear power uses the kinetic energy of wind.
B. Nuclear power can produce electricity in any weather.
O C. Nuclear power produces less waste.
D. Nuclear power produces more greenhouse gases.
SUBMI
Answer:
B. NUCLEAR POWER CAN PRODUCE ELECTRICITY IN A Y KIND IF WEATHER.
Name the elements that make up lithium hydroxide.
Answer:
Lithium, oxygen, and hydrogen.
What Is Chromium: Chemical Formula Of Sodium Bicarbonate
Uses Of Cotton: Acetone Formula
Solution Examples: Amino Acid Formula
Explanation:
HOPE ITS HELP;)
Help me please!!!( ꈍᴗꈍ)
Answer:
Vapour pressure
Explanation:
For liquids
[tex]\\ \rm\Rrightarrow V_p\propto T[/tex]
If vapour pressure increases temperature increases.If vapour pressure decreases temperature decreasesCalculate the percent mass of a solution of 5 g NaOH in 95 g of H2O.
Answer:
=50g NaOH) then,no.of moles of the NaOH solution=50g/40g=1.25 moles/litre
Explanation:
answer=50g NaOH
Four glass tanks contain water. In which tank is the pressure of the water on the base greatest.
what is that abbreviated electron configuration for cobalt?
Answer:
[Ar][tex]4s^{2}3d^{7}[/tex]
Explanation:
To write abbreviated electron configurations, begin with the element of interest and work your way down in atomic numbers to the next smallest noble gas.
Write the noble gas symbol in [brackets] and then write the electron configuration as you would normally.
I hope this helps you
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A bolt of lightning strikes the ground 3.5 km (2.2 mi) away and is followed by a crack of thunder. Thunder has a frequency of around 100 Hz and a wavelength of approximately 3.5 m. Use this information to answer the following questions.
i. How long does it take for the light to reach your eye? (2 points)
ii. What will the delay be between lightning flash and thunder boom? (2 points)
iii. Would low-frequency sound waves such as thunder most likely be studied using quantum mechanics or classical mechanics? What would be used to study lightning? (1 point)
Answer:
Explanation:
speed=350
spee=d/t
t=distance/speed
3500m/350=10sec
It will take 10 seconds for the light to reach your eye.
speed=350
spee=d/t
t=distance/speed
3500m/350=10sec.
Why is there a postponement among lightning and thunder?Thunder and lightning all occur because of the discharge of power – thunder is a soundwave, and lightning is the emission of electromagnetic electricity. The cause we see a flash of lightning earlier than hearing thunder is because light travels quicker than sound.
If you rely on the variety of seconds among the flash of lightning and the sound of thunder and then divide with the aid of 5, you will get the gap in miles to the lightning: five seconds = 1 mile, 15 seconds = three miles, 0 seconds = very close. keep in mind that you ought to be in a secure place at the same time as counting.
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Can you use your plot to predict the absorbance of a 214 mm solution of nickel(ii) chloride and why?.
The absorbance of the 214 mm solution of nickel(ii) chloride can be obtained by fitting it into the regression line of the calibration curve.
What is a calibration graph?During measurements of the concentration of a solution using a spectrophotometer, it is conventional to first calibrate the instrument. The calibration is done by measuring the absorbance of various concentrations of the test solution after measuring the absorbance of the sample blank.
After the instrument has been calibrated, the absorbance of any test solution can now be obtained by fitting it into the regression line of the calibration curve.
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Why does the color absorded by a solution differ from the color of the solution.
Answer:
The size of the particle has a color effect in Rayleigh scatter, but that is unrelated to your question. In the visible spectrum, the main factor determining the color is electronic transitions in the atoms and molecules which make up the substances.
For very simple compounds, it is relatively easy to determine the absorption bands. The bands could possibly change in solution because the electrical environment of the compound’s molecules could change while in solution with water’s polar molecules. However, in many cases, the bands only change slightly so that a purple crystal for example might remain a purple color in aqueous solution.
Some compounds are very sensitive to ionization and to the pH of the aqueous solution, and for these compounds you may see large color shifts as they go into solution.
The symbol equation for combustion of a hydrocarbon is shown below. What number should go before the water product in order to balance this equation?
Answer:
4
Explanation:
Since there are 3 carbons on the left side, make the coefficient of CO2 equal to 3.
Also, since there are 8 hydrogen on the left side, make the coefficient of H2O equal to 4.
This means there are 3(2)+4=10 oxygen atoms on the right, making the coefficient of O2 equal to 5.
Combustion is a type of reaction in which hydrocarbon burns in presence of oxygen to give carbon dioxide and water. The balanced equation is C₃H₈+5O₂ [tex]\rightarrow[/tex] 3CO₂+4H₂O
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. This law is based on conservation of mass.
The unbalanced equation is
C₃H₈+O₂ [tex]\rightarrow[/tex] CO₂+H₂O
Since there are 3 carbons on the left side, so make the coefficient of CO2 equal to 3.
Also, since there are 8 hydrogen on the left side, make the coefficient of H2O equal to 4.
This means there are 3(2)+4=10 oxygen atoms on the right, making the coefficient of O2 equal to 5.
The balanced equation is
C₃H₈+5O₂ [tex]\rightarrow[/tex] 3CO₂+4H₂O
Thus the balanced equation is C₃H₈+O₂ [tex]\rightarrow[/tex] CO₂+H₂O
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A student wants to prepare 250.0 mL of a 0.754 M HCl solution, starting with a 11.7 M HCl solution. How much of the 11.7 M HCl solution is needed
Please help me I’m very very lazy-(Science)
Answer:
this one is a little tricky but i would have to say A. please correct me if im wrong
Explanation:
Answer:
A
Explanation:
Producers are plants while consumers eat other things to get energy, like us
help?!!!!......ʕ ꈍᴥꈍʔ
Answer:
If a gas expands at a constant temperature, the kinetic energy of molecules remains the same.
Extra's:
At constant temperature, kinetic energy is constant. Kinetic energy of molecules remains unchanged at constant temperature.
Telescopes PLS missing words i've done most of it but stuck on two pls help
Answer:
A objective
B occular body
C Light Gathering
D Magnifying images
E Improving resolution
F Climate controlled
G Distortion
H Temperature
Which of the following is true?
- [ ] A mole of propane has more mass than a gram of propane.
- [ ] A mole of propane has 6.03 x 10^23 grams.
- [ ] A gram would have a lot more molecules of propane than a mole.
- [ ] There’s no difference; they’re the same.
Answer:
The answer should be D
Explanation:
because turning 1 mole of propane to grams means its still one mole of propane just in a different unit.
Calculate the average acceleration of a car with a starting velocity of 0 m/s that accelerates to 9
m/s in 3 seconds.
Answer:
3 m/s
Explanation:
I found the unit rate which is 9/3 = 3
2. If you are given the mass of a reactant in grams and want to calculate the mass of
a product in grams, what are the three steps of the calculation you must perform?
Answer:
1. Convert given mass of reactant to moles.
2. Convert moles of reactant to moles of product using the coefficients in the balanced equation.
3. Convert moles of product back to grams of product
Explanation:
In order to find out the mass of a given product in grams you would have to convert the grams into moles by multiplying 1 mole over the given mass of the reactant. Then, you would convert the moles of the reactant into moles of the product using mole ratio. And lastly, you would multiply by the mass of the product to calculate the mass back to grams.
Hope this helps!!<3
the central part of an atom is what
Answer:
Nucleus
Explanation:
the nucleus is the central part of an atom where protons and neutrons are held together.the Nucleus is the central core of the atom, around which the electrons (negatively charged subatomic particles) orbit.Name two properties that make solutions different from colloids.
Answer:
1. the apperance of a solution is clear while that of a colloid is dull
2. colloids are heterogenou while solutions are homogenous
Which heats up the fastest? treated glass, aluminum, stainless steel, or copper?
Answer:
stainless steel
Explanation:
stainless steel would heat up fast because it is made of metal
earth overshoot day was september 23 2008. what does that mean?
Answer:
Earth Overshoot day is the day when Earth is projected to have a demand for ecological services and resources that exceeds what is possibly sustainable.
Explanation:
The demand placed on Earth is not sustainable long term.
6HCl + 1Fe2O3 = 2FeCl3 + 3H2O
How many moles of Fe2O3 does it take to completely react with 4 moles of HCl?
Answer: 2/3
Explanation:
giving brainliest help.
Answer:
Increases
Explanation:
I have an A in science I did this
In general, as the temperature of a solution composed of a gas in a liquid is increased, the solubility of the gas decreases
This is because the solvent in a solution cannot to accommodate gaseous solute in it and gas bubbles out, hence the reason why the solubility of the gas decreases
What is solubility?This can be defined as the degree in which a substance dissolves in a solvent in order to make a solution
So therefore, in general, as the temperature of a solution composed of a gas in a liquid is increased, the solubility of the gas decreases
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As plant roots grow, they can split rock apart. This is a type of
Answer:
this is a type of weathering
Explanation:
wearing is the process of the breaking of rocks through weather or plants
mention roles played by Moses
Answer:Each event in the journey from Egypt to Mount Sinai, where God delivers his laws to the Israelites, propels Moses further into the roles of prophet, priest, ruler, and savior of Israel. Moses' most heroic virtue is his steadfast obedience, and it might be said that a passive quality permeates each of his miracles.
Explanation:
What are some good puns about elements in chemistry?.
Answer:
When all the elements die, we Barium!
Ugh, I need to zinc of new Chemistry puns…
Oxygen and Magnesium are going out? O Mg!
Don't trust atoms! They make up everything!
What is the purpose of the source? Is the article current? (The main purpose of the source could be documenting scientific research, reporting news, providing entertainment, or marketing products. A current article is one that was published in the recent past.)
The molar mass of KCl is 74. 55 g/mol. If 8. 45 g KCl are dissolved in 0. 750 L of solution, what is the molarity of the solution? Use Molarity equals StartFraction moles of solute over liters of solution EndFraction. 0. 113 M 0. 151 M 6. 62 M 11. 3 M.
Molarity is the strength of the solution or the ratio of the moles and the volume of the solution. The molarity of the solution is 0.1516 mol per Liter.
What is molarity?Molarity is the molar concentration of the solution that tells about the amount of the solute or the substance dissolved in the given amount of the solution.
Given,
Mass of potassium chloride = 8.45 gMolar mass of potassium chloride = 74. 55 g/molVolume of the solution = 0.750 LMoles can be calculated by:
[tex]\begin{aligned}\rm Moles &= \rm \dfrac{Mass }{\rm Molar \;mass}\\\\&= \dfrac{8.45}{74.55}\\\\&= 0.1133\;\rm mol\end{aligned}[/tex]
Calculate molarity by:
[tex]\rm Molarity = \dfrac{moles}{\text{Volume in L}}[/tex]
Substituting values in the equation:
[tex]\begin{aligned}\rm Molarity &= \dfrac{0.1133}{0.750}\\\\&= 0.1516 \;\rm mol\;L^{-1}\end{aligned}[/tex]
Therefore, the molarity of the solution is 0.1516 mol per Liter.
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A 350. mL air sample collected at 35°C has a pressure of 550. torr.
What pressure will the air exert if it is allowed to expand to 425 mL at 57°C?
[tex]\tt \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
T₁ = 35 + 273 =308 K
T₂ = 57 + 273 =330 K
550.350/308 = P₂.425/330
P₂ = 485.29 torr
Help!!!! Its a chemistry question Please Take a look at the following chemical reaction and data table provided.
What mass of water is expected to be produced in the reaction above?
Answer:
The third one is the answer.
