The value of Avogadro's number was obtained by dividing the charge of a mole of electrons by the charge of a single electron which is equal to 6.02214154 x 1023 particles per mole.
The most common used way is
n=Charge of one mole of atom /charge of one single atomThere can be another derived way
No of molecules=No of moles ×Avagadro noAvagadro no=No of molecules/No of moles175 ml of a 1.6 m solution of kcl is diluted to a new volume of 1.0 l. what is the new concentration of the solution?
The new concentration of the KCl solution after mixing 1 L new volume is 0.28 M.
How do we calculate the concentration?Concentration in terms of molarity will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ = molarity of old KCl solution = 1.6 M
V₁ = volume of old KCl solution = 175 mL = 0.175 L
M₂ = molarity of new KCl solution = ?
V₂ = volume of new KCl solution = 1 L
On putting all these values on the above equation, we get
M₂ = (1.6)(0.175) / (1) = 0.28 M
Hence resultant concentration is 0.28 M.
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A footprint of a Tyrannosaurus rex has been found in New Mexico. What type of fossil is this
imprint?
Cast?
Tar seep?
Answer:CAST!!!!!!!!!!!!!!!
Explanation:
A soft drink contains 12.1% sucrose (C12H22O11) by mass. What volume of the soft drink solution in milliliters contains 102.5 g of sucrose? (Assume a density of 1.04 g/mL)
The volume of the soft drink solution in milliliters that contains 102.5 g of sucrose is 11.93mL.
How to calculate volume?The volume of a solution can be calculated by dividing the mass by the density. That is;
Volume = mass/density
According to this question, a soft drink contains 12.1% sucrose (C12H22O11) by mass. This means that the mass of the sucrose is
12.1/100 × 102.5 = 12.40g of sucrose
Volume = 12.40g ÷ 1.04g/mL
Volume = 11.93mL
Therefore, the volume of the soft drink solution in milliliters that contains 102.5 g of sucrose is 11.93mL.
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What effect will doubling the initial concentration of crystal violet have on the rate
When the initial concentration of crystal Violet is double, the rate of the reaction will rise up about four times the initial rate.
What is the rate of chemical reaction?The rate of a chemical reaction refer to the rate of change in concentration of the reaction over the change in time. Introduction.
When you double the concentration the rate doubles. The rate is proportional to the square of the concentration of a reactant. When the rate is doubled the concentration rate goes up four times. The rate is not affected by the concentration of a reactant.
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When doubling the initial concentration of crystal violet, the rate will increase four times.
What is the effect of concentration on the rate of a reaction?The rate doubles when the concentration is doubled.
The rate is proportional to the square of a reactant's concentration. When the concentration is doubled, the rate increases fourfold.
The concentration of a reactant has no effect on the rate.
Thus, when doubling the initial concentration of crystal violet, the rate will increase four times.
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Based on the results of testing colorless solutions with indicators, which solution is most acidic?
A solution in which methyl orange is red indicates the most acidic substance.
What is an Indicator?This is defined as a substance that gives a visible sign, usually by a colour change when a chemical species is added.
On litmus paper, the redder the color is, the more acidic it is which was why methyl orange changing to darker red signifies most acidity.
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"Review of the Basics" - WS #1
Directions: Please answer each fill in the blank with the best answer. »
1.
are atoms or groups of atoms that have a positive or negative charge.
2. A
is any atom or group of atoms with a positive charge
Answer: 1. Ions
2. Cation
Explanation:
No explanation; this is basic vocabulary. :)
what is the valency and symbol of chromium ?
Answer:
two valence states: trivalent chromium (Cr III) and hexavalent chromium (Cr VI)
hope this helps, i can change it if it doesn't.
How does matter change its phase?
Explanation:
the answer can be in liquid, solid and gas
HELP ITS DUE IN 5 MINS PLSSS Name at least one negative affect that is the result of clearing areas of a rainforest.
Answer:
The loss of trees and other vegetation can cause climate change, desertification, soil erosion, fewer crops, flooding, increased greenhouse gases in the atmosphere, and a host of problems for indigenous people.
Explanation:
What are the examples of physical chemistry?
ANSWER:
Physical chemistry is the branch of chemistry that deals with the physical structure of chemical compounds, the way they react with other matter and the bonds that hold their atoms together. An example of physical chemistry is nitric acid eating through wood.
How long will hydrogen peroxide make a dog throw up?.
What factor would speed up a chemical reaction
Answer:
Adding Catalyst can Speed up a Chemical reaction
Answer: catalyst
Explanation:
a catalyst is a substance that helps speed up chemical reactions.
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What are two benefits of using tides for energy?Good explanation=Brainliest.
Answer:
Advantages of tidal energyRenewable.
Tidal energy is a renewable source of energy, which means the energy doesn’t deplete as it is used. …
Zero carbon emissions. In addition to being a renewable energy source, tidal power stations do not emit greenhouse gasses during electricity generation. … Predictable. … High power output.
Explanation:
predict what happens when lead is added to nitric acid
When Lead reacted with nitric acid, lead(II) nitrate, nitrogen oxide and water are produced.
What products are produced when lead reacts with nitric acid?
Lead(II) nitrate, nitrogen oxide and water are the products which are produced by reacting lead and nitric acid with each other. The nitrogen attach with the lead molecule as well as oxygen which produces Lead(II) nitrate and nitrogen oxide.
So we can conclude that when Lead reacted with nitric acid, lead(II) nitrate, nitrogen oxide and water are produced.
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Which of the following shows a bronsted-lowry acid reacting? co no2 right arrow. co2 no nh3 h right arrow. nh4 upper c upper o subscript 3 superscript 2 minus. h right arrow. hco3– hcl h2o right arrow. h3o cl–
The reaction which shows the bronsted-lowry acid reacting is HCl + H₂O → H₃O⁺ + Cl⁻.
What is Bronsted - Lowry acid?According to the Bronsted-Lowry theory, the species which donates H⁺ ion to the solution is known as Bronsted-Lowry acid and which accepts H⁺ ion is known as Bronsted-Lowry base.
Among the given reactions, only the reaction which is showing Bronsted-Lowry acid is:
HCl + H₂O → H₃O⁺ + Cl⁻
Here HCl is a Bronsted-Lowry acid as it gives H⁺ ion in the aqueous solution.
Hence, option (3) is correct.
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According to the kinetic-molecular theory, what is one way the three states of matter are all similar?
The kinetic molecular theory of matter states that:
1. Matter is made up of particles that are constantly moving.
2. A change in phase may occur when the energy of the particles is changed.
3. All particles have energy, but the energy varies depending on the temperature the sample of matter is in. This in turn determines whether the substance exists in the solid, liquid, or gaseous state.
2CuCl2 + 4KI → 2CuI + 4KCl + I2
a. When 0.64 grams of CuCl2 reacts with 0.78 grams of KI, how many grams of I2 are formed?
b. What is the limiting reactant?
PLEASE I NEED HELP
which element would be most likely to lose electrons in chemical bond
A student used 1.2 g of hydrate in the first trial and 1.6 g in the second trial. Explain fully why her mass percent of water will be the same for both trials even though she used more hydrate in the second trial. (Do not simply state that the mass percent is an intensive property ).
Both trials of 1.2 g and 1.6 g will have the same mass percent of water because the ratio of the salt to the water of hydration is always constant for any hydrated salt.
Water of hydrationFor every hydrated salt, the ratio of the salt to the water of hydration remains constant irrespective of the amount of salt taken for experimental analysis.
For example, assuming the mass percent of water in 10g of a hydrated salt is 40%, if 100g of the same salt is taken, the mass percent will remain 40%.
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PLEASE HURRY AND WILL GIVE BRAINLIEST
What are 3 ways that radio waves are used in everyday life?
What are 3 ways that infrared waves are used in everyday life?
Thank You!
Explanation:
which of the following is additive inverse of the following
Suppose a researcher wanted to extract as much zinc ion as possible from solution a without any copper (ii) impurity. How many milliliters of solution b should the researcher add to solution a?
The extraction of metal usually makes use of the method of precipitation in which a reagent is added which is able to precipitate the required metal in its pure form without impurities.
What is extraction?The process of extraction has to do with the removal of a substance from another. It is usually the way that pure substances are obtained in chemistry. The question is incomplete but I will try to give a general idea.
The extraction of metal usually makes use of the method of precipitation in which a reagent is added which is able to precipitate the required metal in its pure form without impurities. We can not make numerica;l calculatiosn as the values are missing.
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Convert −5 ◦C to Kelvin.
Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40. 10 g. She knows that the molar mass of NH4NO3 is 80. 0432 g/mol. To the correct number of significant digits, how many moles of NH4NO3 does the sample contain? 0. 50 moles 0. 500979 moles 0. 500980 moles 0. 5010 moles.
Moles are an estimation of the smallest unit of the molecules and the atoms in a sample. The moles of ammonium nitrate in a sample are 0.5010 moles.
What are moles?Moles are calculated by dividing the mass of the substance in gm by that of the molar mass in gram per mole.
Given.
Mass of ammonium nitrate = 40.10 gm
The molar mass of ammonium nitrate = 80. 0432 g/mol
Moles of ammonium nitrate are calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{40.10}{80.0432}\\\\&= 0.5010 \;\rm mol\end{aligned}[/tex]
Therefore, moles of ammonium nitrate present is option d. 0.5010 moles.
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Low frequency waves have longer wavelength true or false
Answer:
True
Explanation:
Since the waves have low frequency that means the wavelength is going to be longer. Hope this helps
What type of energy is shown in the circled portion of the graph? *
Answer:
Thermal Energy
Explanation:
Energy that is dissipated or absorbed as heat is in the form of thermal energy.
0.05 moles of HCL are added to 2 L of H2O. What is the molarity of the solution?
Impossible to answer the question with the information provided.
1.60
0.025M
10.4
The molarity of a solution that has 0.05 moles of HCL are added to 2 L of H2O is 0.025M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
M = n/V
Where;
M = molarityn = number of molesV = volumeM = 0.05/2
Molarity = 0.025M
Therefore, the molarity of a solution that has 0.05 moles of HCL are added to 2 L of H2O is 0.025M.
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Explain the role of gravity in the waterfall.
Explanation:
A water fall falls and hits the base with force depending on the distance from which it fell.This force is caused by gravity pulling the water molecule as well as some other particles like eroded soil rapidly downwards.
Calculate the kovats retention index for an unknown using the retention times 1. 6 min for ch4, 12. 8 min for octane, 15. 4 min for the unknown, and 19. 6 min for nonane
For an unknown using the retention times 1. 6 min for ch4, 12. 8 min for octane, 15. 4 min for the unknown, and 19. 6 min for nonane, the kovats retention index is mathematically given as
I = 807.857
What is Kovats retention index?Generally, the equation for the Kovats index(i) is mathematically given as
[tex]I= \frac{100[n + (N - n) x (Log tr (unknown) - logtr (n))}{ logtr(N) - logtr(n))]}[/tex]
Therefore
[tex]I= \frac{100[ 1+8*(log(14.7) -log (1.5)}{log (19.8) - log (1.5)) 0]}[/tex]
I = 100[ 1+8*(0.991/1.12)]
I = 807.857
In conclusion, Kovats retention index
I = 807.857
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Kovats retention index is a system that converts the retention time into the independent constants of the system. The Kovats retention index for the unknown is 807.857.
What is the Kovats retention index?The Kovats retention index (I) is the system used in analytical techniques like gas chromatography for the conversion of the retention time. It is given mathematically as:
[tex]\rm I = \rm \dfrac{100[n+(N-n)x(Logtr(unknown)-logtr(n))}{Logtr(N)-Logtr(n)]}[/tex]
Substituting values and solving further,
[tex]\begin{aligned} \rm I &= \rm \dfrac{100[1+8 \times (Log(14.7) - log (1.5))}{(log (19.8) - log (1.5))0}\\\\&= 100 [ 1 + 8 (\dfrac{0.991}{1.12})]\\\\&= 807.857\end{aligned}[/tex]
Therefore, the Kovats retention index for an unknown is 807.857.
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To what temperature must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure?
Taking into account the Charles's law, to 94.36 K or -178.64 °C must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure.
Charles's lawThis law states that the volume is directly proportional to the temperature of the gas: for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.
In summary, Charles' law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Studying two different states, an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Temperature of helium gasIn this case, you know:
V1= 3.1 LT1= 139 C= 412 K (being 0 C= 273 K)V2= 0.71 LT2= ?Replacing in Charles's law:
[tex]\frac{3.1 L}{412 K} =\frac{0.71 L}{T2}[/tex]
Solving:
[tex]\frac{3.1 L}{412 K} T2=0.71 L[/tex]
[tex]T2 =\frac{0.71 L}{\frac{3.1 L}{412 K}}[/tex]
T2= 94.36 K= -178.64 °C
Finally, to 94.36 K or -178.64 °C must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure.
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Which are characteristics of photosynthesis? (Select all that apply.) Oxygen is provided to animals from this process. It takes place in the flower of a plant. Plants use this process to make their food. It provides the energy that we obtain from our food.
Answer:
2 , 3 and 4
Explanation:
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