The number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.
How to calculate number of moles?The number of moles in the formula units of a substance is calculated by dividing the formula unit by Avogadro's number.
According to this question, 3.20 x 10² formula units are in calcium iodide. The number of moles is as follows:
no of moles = 3.20 x 10²² ÷ 6.02 × 10²³
no of moles = 0.53 × 10-¹
no of moles = 0.053 moles
Therefore, the number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.
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Matter can undergo chemical reactions and nuclear reactions. Which statement is true only for nuclear reactions?
A - The mass of reactants is conserved
B - The energy of reactants is conserved
C - The atoms are reorganized into products.
D - The nuclei of the atoms.
Answer:
B - The energy of reactants is conserved.
D - the nuclei of atoms changes completely ( if that's the option)
Calculate the ionization constant of each reaction. hcl (aq) + h2o (l) equation h3o+ (aq) + cl- (aq); [hcl] = 16.9m, [h3o+] = 13.3m, [cl-] = 7.4mka =
The ionization constant from the reaction as shown in the calculation is 5.8.
What is the ionization constant?The term ionization constant refers to the extent to which the acid is ionized in solution. It is calculated from;
Ka = [H3O^+] [Cl]/[HCl]
Thus when we substitute the values;
Ka = 13.3 * 7.4/ 16.9
Ka = 5.8
The ionization constant from the reaction as shown in the calculation is 5.8.
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Why are no flying dinosaur fossils found in rocks that are younger than those
formed during the Mesozoic era?
The flying dinosaurs becoming extinct was the reason they were not found in rocks that are younger than those formed during the Mesozoic era.
What is a Fossil?This is defined as preserved remains of plants and animals found on earth crust.
The flying dinosaurs became extinct which was why the fossils found during the Mesozoic era were not younger and makes option C correct.
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Which of these actions would increase heat transfer between two objects?
&
establishing their thermal equilibrium
increasing the area of their contact
using objects with similar specific heats
• reducing the time of their contact
Heat transfer is the phenomenon that occurs when the two objects are in the vicinity of each other and by increasing the area of their contact. Thus, option B is correct.
What is heat transfer?Heat transfer is a process that flows the heat from one system to another, and is because of the difference in the temperature of the two objects that are part of the system.
The methods like conduction, convection, and radiation transfer the heat from the surface area to the other object. The heat gets transferred from the area of high to the low temperature.
Therefore, option B. by increasing the surface area the heat transfer increases.
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Assuming a parent isotope with a half-life equal to 4.5 billion years, what percentage
of the original parent remians after 6.75 billion years have passed?
Answer:
35.4 % left
Explanation:
6.75 / 4.5 = 1.5 half lives
1/2 ^(1.5) = .354 or 35 .4 %
Different isotopes of the same element emit light at slightly different wavelengths. A wavelength in the emission spectrum of a hydrogen atom is 656.45 nm; for deute- rium, the corresponding wavelength is 656.27 nm. (a) What minimum number of slits is required to resolve these two wavelengths in second order
Different isotopes of the same element emit light at slightly different wavelengths, the minimum number of slits is mathematically given as
N=1820slits
What minimum number of slits is required to resolve these two wavelengths in second-order?Generally, the equation for the wave is mathematically given as
[tex]d\ sin\ (\theta\ m) \ = \ m\ \lambda[/tex]
Where the chromatic resolving power (R) is defined by
[tex]R\ =\ \lambda\ / \ d \ \lambda[/tex]
R = nN,
Therefore
[tex]\lambda_1 \ = \ (656.45)(1 \ * \ 10^{-9})/1mm[/tex]
[tex]\lambda_1= 656.45*10^{-9}[/tex]
and
[tex]\lambda_2= (656.27)(1*10^{-9})/1mm[/tex]
[tex]\\\\\lambda_2= 656.27*10^{-9}m[/tex]
In conclusion, the minimum number of slits is required to resolve these two wavelengths in second-order
[tex]N\ =\ \dfrac{\lambda}{m\ d\ T\ }\\\\[/tex]
Therefore
[tex]N\ =\ \dfrac{656.45 \ * \ 10^{-9}}{2\ * \ (0.18*10^{-9})}[/tex]
N=1820slits
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4. When 175 g of water is heated from 22.0°C, 1.57x106 J of energy are produced.
What is the final temperature of the water? (AT=Tr-Ti)
Answer: [tex]2168 ^{\circ} \text{C}[/tex]
Explanation:
For this question, we can use the formula [tex]Q=mc \triangle T[/tex], where [tex]Q[/tex] is the amount of heat absorbed, [tex]m[/tex] is the mass of the sample, [tex]c[/tex] is the specific heat constant, and [tex]\triangle T[/tex] is the change in temperature (final temperature minus initial temperature as stated in the question).
From the question, we know that [tex]m=175, Q=1.57 \times 10^{6}[/tex]. Furthermore, we know that [tex]c=4.18[/tex] (this is just a fact).
So, we get that [tex]1.57 \times 10^{6}=175(4.18)(\triangle T)[/tex], meaning [tex]\triangle T=2146[/tex].
Thus, [tex]t_{f}-22.0=2146 \longrightarrow t_{f}=\boxed{2168 ^{\circ} \text{C}}[/tex]
Water has a ph of 7. if 0.1 ml (about one drop) of 1.0 m hno3 is added to 100 ml of water, the result is a solution with a concentration of 0.001 m hno3. what is the ph of 0.001 m hno3
1.0 m [tex]HNO_3[/tex] is added to 100 ml of water, the result is a solution with a concentration of 0.001 m [tex]HNO_3[/tex] and the ph of 0.001 M [tex]HNO_3[/tex] is 3
What is [tex]_PH[/tex] ?pH historically denoting "potential of hydrogen" (or "power of hydrogen") is a scale used to specify the acidity or basicity of an aqueous solution
GIven ,
[tex]H^{+}[/tex] = [tex]10^{-3}[/tex] M
we have the formula for
[tex]_PH[/tex] = - log [[tex]H^{+}[/tex]]
[tex]_PH[/tex] = - log [ [tex]10^{-3}[/tex] ]
= 3 log 10
[tex]_PH[/tex] = 3
Hence, [tex]_PH[/tex] of water is 7 but after adding 1 drop (0.001 m [tex]HNO_3[/tex] ), It changes to 3.
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define an arrhenius acid and describe the properties of acids. use an example to explain how an arrhenius acid will behave when dissolved in water.
An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons.
What is an Arrhenius acid?An Arrhenius acid increases the number of[tex]H^+[/tex] ions in the water.
According to the Arrhenius theory, a substance which has hydrogen atom and can easily give hydrogen ion or proton in its aqueous solution is called as Arrhenius acid.
For example, when hydrochloric acid is dissolved in water, it forms chloride ion ([tex]Cl^-[/tex]) and hydronium ion ([tex]H_3O^+[/tex]).
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11) A sample of 131I decays to 1.0 gram in 40 days. What was the mass of the original sample? [half-life = 8.07 days]
A) 32 g
C) 16 g
D) 8.0 g
B)4.0 g
Given the remaining quantity after the given time and the half-life, the initial quantity or original mass of the sample is 32g.
Option A) is the correct answer.
What was the mass of the original sample?Half-life is simply the amount of time it takes a given quantity to decrease to half of its initial value.
Using the expression:
[tex]N_{(t)} = N_{0}\frac{1}{2}^{\frac{t}{t_{\frac{1}{2} }} }[/tex]
Given the data in the question;
Remaining quantity Nt = 1.0gtime t = 40 daysHalf life t(1/2) = 8.07 days[tex]N_{(t)} = N_{0}\frac{1}{2}^{\frac{t}{t_{\frac{1}{2} }} }[/tex]
[tex]1.0g = N_{0} * (0.5)^{40days/8.07days}\\\\1.0g = N_{0} * (0.5)^{4.95662949}\\\\1.0g = N_{0} * 0.0322037055\\\\N_{0} = \frac{1.0g}{0.0322037055} \\\\N_{0} = 31.05g = 32g[/tex]
Therefore, given the remaining quantity after the given time and the half-life, the initial quantity or original mass of the sample is 32g.
Option A) is the correct answer.
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list 10 ways a small community can conserve energy and recourses??
An oil has a density of .78g/ml and a mass of 3.6kg. what is the volume of the oil?
Answer:
v = 4.62 L
Explanation:
Necessary Conversion:
1000 g = 1 kg
Density of Oil in kg/mL:
0.78g/ml * (1 kg/1000 mL) = 0.00078 kg/mL
Density Equation (Heart with an arrow through it):
d = m/v
Rewrite to Find Volume (Multiply Both Sides by v/d):
v = m/d
Substitue m and d to Find v:
v = (3.6 kg)/(0.00078 kg/mL)
v = 4615.38 mL
Convert to More Suitable Units (Liters) by Dividing by 1000:
v = 4.62 L
:D
The Caribbean islands are known for their many resources. For example, the ore of aluminium is found in Jamaica and Guyana. (i) Briefly describe the extraction of aluminium from its named ore. Include in your description ONE ionic equation.
Answer:
i don't know send on my insta I'd its_arsh_pb27
Explanation:
Compare the temperature change for cold sand and cold water when the same amount of hot water was added. what do you discover?
When the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
What is specific heat capacity?Specific heat capacity is the quantity of heat required to raise a unit mass of a substance by 1 kelvin.
Specific heat capacity of water and sandWater, c = 4,200 J/kg⁰C
Sand, c = 830 J/kg⁰C
Q = mcΔθ
where;
Δθ is temperature changeQ is quantity of heat addedΔθ = Q/mc
Thus, for an equal mass of water and sand, when the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
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Answer:t
Explanation:
Draw the structures of the aldol addition and condensation products of pentanal
The structures of the aldol addition and condensation products of pentanal are attached as an Image with this answer.
What is Aldol Addition ?
An aldol addition is a reaction that occurs between the enolate of an aldehyde or ketone and the alpha-carbon of another aldehyde or ketone to form a beta-hydroxy aldehyde or ketone.
The term aldol condensation has to do with a reaction in which a nucleophile attacks the carbonyl group of an aldehyde or a ketone to convert it to the enolate from which attacks another aldehyde or ketone at the carbonyl carbon to form the required product.
The product obtained in the process is shown in the image attached with the answer.
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We are now finished learning about the various units in forensics. Using what we have learned in class all year and this week’s episode of forensic files, which branches of forensics are most important when solving a criminal justice case? Use and underline at least 3 vocab words that we used in this unit.
Pathology is the main branch of forensics in order to solve a criminal justice case, although other branches may also be important.
What are forensics sciences?Forensic sciences refer to the scientific fields aimed at solving justice cases such as DNA sample forensics.
Other fields in forensics science include:
forensic botanyforensic archeologyforensic physicsIn conclusion, pathology is the main branch of forensics in order to solve a criminal justice case, although other branches may also be important.
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is calcium hydroxide a strong alkali? if no, why? if yes, why? i really don’t understand
Answer:
Yes
Explanation:
Neither Calcium nor hydrogen nor oxygen are alkali metals
Alkali metals are Group 1 elementsThey are very soft and mellable.H,Li,Na,K,Cs,Fr are included in it however H is not a actual memberHere
Ca(OH)_2 is the compound
Vant Hoff factor is 3
As it's greater than 1 it's a very strong base .
The pOH of this comes around 1.5 to 1.3
So very heavy ionic dissociation
Strong Alkali
Calcium hydroxide [tex] \sf \: Ca(OH)_2[/tex] is a really strong alkali or base since it has the power to accept proton when added to a solution.. Its pH is 9 and we know that when the pH is more than 7 it is a base..
One more reason why calcium hydroxide is a strong alkali is that it dissociates completely when added to any solution...
How many atoms are in 3.5 mol he?
Answer:
2.11×10^24
Explanation:
You times the Avogadro number by 3.5
6.023 times 10^23.
then times it by 3.5.
I got 2.11 times 10 ^24.
I hope this helps. Have a lovely day.
After a radioactive atom decays, it is the same element that it was before with no measurable change in mass. Which kind of decay has occurred, and how do you know?.
Gamma decay is a radioactive decay in which there is no measurable change in mass and the element remains the same.
What happens in gamma decay?In gamma decay, the number of protons and neutrons in the nucleus does not change, so the product of decay remain the same element..
Note that mass number is equal to the sum of the protons and neutrons and so if there is no change, the mass of the element remains the same.
Thus, gamma decay is a radioactive decay in which there is no measurable change in mass and the element remains the same.
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You are an archeologist digging up an ancient village and you discover a 10lb cat. A careful
analysis reveals 5 x 10-13 lbs. of carbon-14. How old is the cat, and presumably the village?
The age of the cat and presumably the village is approximately 13657 years. .
What is Half-Life?Half-Life is the time taken for half the amount of a substance to disappear.
To determine the age of the cat fossil, the following should be noted:
The percentage of carbon in living organisms is 19.4%The mass of the cat is 10 lb.Mass of carbon in the sample = 0.194 × 10 lb = 1.94 lb
Ratio of carbon-12 to carbon-14 = 1 : 1.35 × 10^-12
Mass of carbon-14 initially present = 1.94 × 1/1.35 × 10^-12 = 2.619 × 10^-12
Ratio of present and original mass of carbon-14 = (5 × 10-13)/2.619 × 10^-12 =
The half-life of carbon-14 = 5700 years
The ratio of the mass of carbon-14 at present and initially = 0.191
Using the half-life formula, to calculate time elapsed:
[tex]t = \frac{t_{\frac{1}{2}}ln\frac{N_t}{N_o}}{-0.693}[/tex]
Substituting the values to solve for time, t, in years
[tex]t = \frac{5700 \times \: ln(0.191) }{-0.693} = 13656.8[/tex]
Time elapsed, t = 13656.8 years.
Therefore, the age of the cat and presumably the village is approximately 13657 years.
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What are the products when (nh4)2s is added to a solution that contains al3+?
The product of the reaction is given by the changes in the chemical and physical properties of the reactants. The product produced is aluminum sulfide precipitate.
What is a precipitate?A precipitate is an insoluble complex formed when the solute and the solvent reacts to produce and solid complex material that does not get completely dissolved in the solution.
When ammonium sulfide is added to a solution containing aluminum ions then precipitate of aluminum sulfide is formed as:
3(NH₄)₂S + 2Al³⁺ → Al₂S₃ + 3NH₄⁺
Therefore, aluminum sulfide is the precipitate that gets formed.
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Choose an example of a system, and analyze the energy flow through the system. Describe in detail how energy enters the system, how energy changes form while in the system, and how energy leaves the system
Energy enters into the ecosystem via sunlight and leaves as heat from metabolism.
What is energy?The term energy refers to the ability to do work. Energy enters the ecosystem from the sun and is transformed into chemical energy in food which is now passed along the food chain.
Animals eat plants and part of this energy is used for metabolic activities which releases some of this energy as heat energy.
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Can someone please help? This is really hard!!
Answer:
Less
Explanation:
The hydronium from the HCl is used to neutralize the bicarbonate in the baking soda. The hydronium is the acid and the bicarbonate ion is the base while the sodium and chloride ions are pH-neutral. Since theres a 1:1 mole ratio of hydronium to HCl and bicarbonate to sodium bicarbonate, it would require less HCl to neutralize a less concentration baking soda solution.
39. suppose an aqueous solution contains both table sugar and table salt. can you separate either of these solutes from the water by filtration? explain your reasoning.
Answer:
No, assuming that the salt/sugar is already dissolved
Explanation:
As long as the particle size is too big, it won't filter through. Therefore, if it is dissolved, it will pass through the filter.
If you were to throw rocks in there or something, and they are non-dissolvable, then yes.
Which refers specifically to a heated solution that holds more dissolved solution than it can hold at a lower temperature?.
Answer:
Supersaturated solution
Explanation:
Weren't there any options?
Anyways, the best I can think of right now is a supersaturated solution.
the diagram shows a model of a water cycle which word best summarizes the process labeled x in the model? A. Commensalism B.Photosynthesis C. precipitation D. Evaporation
Answer:
D evaportaion. it shows the sun evaporating the lake.
Types of Temperature ?
Answer:
Is Fahrenheit and Celsius the answers you are looking for?
Explanation:
I hope this could help you! :)
Answer:
Types of Temperature ?Temperature Scales. There are three temperature scales in use today
Fahrenheit, Celsius and Kelvin.Explanation:
Always remember:beluga always love answer your question by following these steps:Follow belugaask meBrainliest me first oktake note please: everyone i answer question I got happy:)please don't delete Your question beacause Brainliest Marks & pointswill be loseHi i will give brainliest to whoever answers this, thank you
Let's see
C1V1=C2V235(0.128)=0.415V24.48=0.415V2V2=10.79mLV2=0.01079LIn the chemical equation 4Fe + 3O2 → 2Fe2O3, 20.99 grams of iron (Fe) are needed to produce 30.01 g of Fe2O3.
True or False?
question -What happens to the energy of a wave if the amplitude of the wave is doubled?
The energy carried by the waves depends on the amplitude of the wave. If the amplitude is doubled then the energy gets increased by four times.
What is amplitude?The amplitude of a wave is the distance from the center line to the trough or the crest of the wave. The energy of the wave is directly proportional to the square of the amplitude.
E ∝ A²
So if the amplitude is doubled then E = 4. Hence, the energy gets increased quadruples times. The energy is related to the frequency and the wavelength of the wave that travels.
Therefore, the energy gets increased by four times if the amplitude is doubled.
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