c = f*L
If you cant remember this just consider the units of each (denoted [c] is units of c):
[c] = meters/second, [f] = 1/seconds or Hertz, [L] = meters
So [c] = [f*L], an easy way to remember it.
So to get the frequency, just solve for f:
f = c/L = (3.00 x 10^8)/(5.93 x 10^-7) m/s = 5.05902192 × 10^14 m/s ~ 5.06 x 10^14 m/s
Difference between a row (“period”) & a column (“group”) on the periodic table and examples.
The rows are the one line of elements that goes from left to right horizontally. A column is a line of elements that goes vertically.
The Big Bang really happened. But within milliseconds, the universe expanded or inflated so rapidly that the universe is flat and uniform
Final answer:
The inflationary model proposes that the universe underwent rapid expansion, known as inflation, shortly after the Big Bang, explaining its flatness and uniformity. The model accounts for the uniform CMB temperature and expounds on the formation of structures within the early universe, including galaxies from concentrated regions of matter.
Explanation:
The Inflationary Hypothesis
Physicists have developed a theory known as the inflationary model to explain certain characteristics of the universe, such as its flatness and uniformity. This hypothesis suggests that shortly after the Big Bang, before the emission of the Cosmic Microwave Background (CMB), the universe underwent a period of incredibly rapid expansion. This period, known as inflation, lasted between about 10-35 and 10-33 seconds after the Big Bang, during which the scale of the universe increased exponentially by a factor of about 1050. These inflationary models adjust for the uniform temperature observed across the CMB and the density of the universe being so close to the critical density. They also help explain how the early hot, dense state of the universe resulted in the large-scale structures we see today, where the concentrated matter eventually formed galaxies.
Formation of Structure in the Early Universe
Theorists suggest that in the early universe, a uniform hot 'soup' of particles vibrated, much like sound waves. These vibrations could have created regions of higher density, which, upon cooling, resulted in the 'frozen in' concentrations of matter from which galaxies eventually formed. The Big Bang model is supported by the isotropic nature and the expansion of the universe, along with CMB evidence. Overall, the model of an inflationary universe fills in the gaps left by the traditional Big Bang model and provides a unified picture of how the early universe evolved, guided by the principles of grand unified theories (GUTs).
If humans cut down a few sections in the middle of the forest to build new homes, which of the following is a likely effect on the ecosystem that could be irreversible?
A.
There will be fewer deer.
B.
The wolves could die out.
C.
The trees might become more abundant.
D.
There will be fewer grasslands.
answer ASAP!!!
The likely irreversible effect on the ecosystem from cutting down sections of the forest to build new homes is a decline in the deer population.
Explanation:If humans cut down a few sections in the middle of the forest to build new homes, the likely effect on the ecosystem that could be irreversible is that there will be fewer deer. When their habitat is destroyed, deer may lose their food sources and shelter, leading to a decline in their population. This can have cascading effects on the entire ecosystem, affecting other organisms that depend on deer for food or as predators.
Final answer:
The irreversible effect of cutting down sections of forest for home construction is likely the extinction of certain species, such as wolves, due to habitat fragmentation and loss.(Option B)
Explanation:
If humans cut down a few sections in the middle of the forest to build new homes, a likely irreversible effect on the ecosystem could be that the wolves could die out. Deforestation leads to habitat loss, which not only impacts individual species such as wolves, who may lose their prey and shelter but also triggers a cascade of effects on the biodiversity and the food web.
The drastic reduction in the population of a species, like certain species of deer due to hunting, can have far-reaching consequences on the ecosystem, altering predator-prey relationships and leading to potential species extinction. Large predators such as wolves are particularly vulnerable when their territories and prey populations become fragmented and diminished. Furthermore, habitat destruction is a primary driver of biodiversity loss worldwide, and when it occurs, the changes can be profound and permanent, given that ecosystems take centuries or longer to naturally restore themselves, if at all.
the high temperatures on venus are caused by the _______.
As sunlight heats Venus' surface, the surface radiates infrared energy that is kept from escaping the planet by dense carbon dioxide atmosphere. This is called the greenhouse effect.
The High tempatures on Venus are caused by the Greenhouse effect
How does getting funding from the government affect scientific research?
Explanation:
Funding from the government greatly affects the scientific research as a research can take number of years to complete. During this time period lot of financial support is required as there might be lot of expensive chemicals or substance that the scientist requires for his research.
So, for an individual it is not possible to continue his research without any financial support or huge bank balance.
Also, government can provide better labs and other resources like good equipments, costly or rarely available chemicals or compounds etc.
There are so many diseases for whom there are no medicines. So, with the help of government funding lots of other medicines can be discovered for the benefit of people and development of nation.
Answer:
Scientists have to follow governmental rules made to protect people.
Explanation:
What two things must you specify when describing the velocity of an object
When describing the velocity of an object, you must specify the both the speed and the direction.
That’s because velocity is a vector: it has both magnitude (speed) and direction.
If you say that a object is travelling southwest at 70 km/s, you are giving its velocity.
If you say that it is travelling at 70 km/s, you are giving its speed.
Final answer:
To describe the velocity of an object, you must specify the magnitude of speed and its direction, reflecting that velocity is a vector quantity unlike speed, which is scalar.
Explanation:
To describe the velocity of an object, one must specify two key things: (1) the magnitude of the speed, which is a scalar quantity representing how fast the object is moving, and (2) the direction of travel, which informs us of the orientation of the object's motion in space. For example, an object moving at 20 meters per second towards the north has a velocity that can be expressed as '20 m/s north'. This descriptive pairing of speed and direction is what differentiates velocity from speed, making velocity a vector quantity.
When illustrating velocity, a vector representation is often used, which is not always to scale but indicates direction and relative magnitude. For instance, in the case of the two airplanes with different speeds and directions discussed in the question, their velocities can be represented by arrows with lengths proportional to their speeds and pointing in the respective directions of travel - northeast and southwest.
A 1.1 kg block of iron at 38 ∘C is rapidly heated by a torch such that 13 kJ is transferred to it. What temperature would the block of iron reach assuming the complete transfer of heat and no loss to the surroundings? If the same amount of heat was quickly transferred to a 890 g pellet of copper at 38 ∘C, what temperature would it reach before losing heat to the surroundings?
Cs, Fe(s)= 0.450 J/g*C
Cs, Cu(s)= 0.385 J/g*C
Answer:- Iron block final temperature is 64 degree C and copper block final temperature is 76 degree C.
Solution:- These problems are based on the formula:
[tex]q=mC_s\Delta T[/tex]
where, q is the heat energy, m is mass, [tex]C_s[/tex] is specific heat and [tex]\Delta T[/tex] is the change in temperature.
mass of iron is given as 1.1 kg. We need to convert it to grams:
[tex]1.1kg(\frac{1000g}{1kg})[/tex] = 1100 g
q is 13 kJ, let's convert it to J:
[tex]13kJ(\frac{1000J}{1kJ})[/tex] = 13000 J
[tex]C_s[/tex] of iron is [tex]\frac{0.450J}{g.^0C}[/tex]
Let's calculate change in temperature for iron.
[tex]\Delta T=\frac{13000J}{1100g*\frac{0.450J}{g.^0C}}[/tex]
[tex]\Delta T=26 ^0C[/tex]
Since, [tex]\Delta T[/tex] = final temperature - initial temperature
26 = final temperature - 38
final temperature = 26 + 38 = 64 degree C
So, The final temperature of iron block would be 64 degree C.
Let's do the same calculations for copper block, it's mass is 890 g and specific heat is [tex]\frac{0.385J}{g.^0C}[/tex] .
[tex]\Delta T=\frac{13000J}{890g*\frac{0.385J}{g.^0C}}[/tex]
[tex]\Delta T=38 ^0C[/tex]
Now, calculations for final temperature:
[tex]\Delta T[/tex] = final temperature - initial temperature
38 = final temperature - 38
final temperature = 38 + 38 = 76 degree C
So, the final temperature of copper block is 76 degree C.
The final temperature of the iron block will be 64.1 °C,
The final temperature of the copper pellet will be 76.0 °C after 13 kJ of heat is transferred to each.
This assumes no heat loss to the surroundings.
To solve this, we use the formula:
q = m * Cs * ΔT
Where q is the heat transferred, m is the mass, Cs is the specific heat capacity, and ΔT is the change in temperature.
For the iron block:
Mass (m) = 1.1 kg = 1100 gSpecific heat capacity (Cs) = 0.450 J/g°CHeat transferred (q) = 13,000 JRearranging the formula to solve for ΔT:
ΔT = q / (m * Cs)
ΔT = 13,000 J / (1100 g * 0.450 J/g°C) ≈ 26.1 °C
The initial temperature is 38 °C, so the final temperature will be:
38 °C + 26.1 °C = 64.1 °C
For the copper pellet:
Mass (m) = 890 gSpecific heat capacity (Cs) = 0.385 J/g°CHeat transferred (q) = 13,000 JSimilarly, solving for ΔT:
ΔT = q / (m * Cs)
ΔT = 13,000 J / (890 g * 0.385 J/g°C) ≈ 38.0 °C
The initial temperature is 38 °C, so the final temperature will be:
38 °C + 38.0 °C = 76.0 °C
BRAINLIEST + 20 POINTS FOR BEST ANSWER!!!
Match each type of electromagnetic radiation to its description.
Gamma rays A) Given off by very hot objects, such as the sun Microwaves B) Given off by radioactive substances
Ultraviolet light C) Used in radar and to heat food X‒rays D) Used in the medical field to see bone structure
Each type of electromagnetic radiation have been matched to their descriptions as follows:
Ultraviolet light A) Given off by very hot objects, such as the sun
Gamma rays B) Given off by radioactive substances
Microwaves C) Used in radar and to heat food
X‒rays D) Used in the medical field to see bone structure
Gamma rays - B) Given off by radioactive substances
Microwaves - C) Used in radar and to heat food
Ultraviolet light - A) Given off by very hot objects, such as the sun
X-rays - D) Used in the medical field to see bone structure
Gamma rays are a type of electromagnetic radiation emitted by radioactive substances. They have high energy and can penetrate deep into materials, making them useful in various applications such as medical imaging, cancer treatment, and industrial inspections.
Microwaves are a type of electromagnetic radiation used in radar systems for communication and navigation. They are also used in household microwave ovens to heat food by causing water molecules in the food to vibrate and generate heat.
Ultraviolet light is electromagnetic radiation with higher energy and shorter wavelengths than visible light. It is emitted by very hot objects, such as the sun. Ultraviolet light has various effects on living organisms and can cause tanning, sunburn, and vitamin D production in humans.
X-rays are a type of electromagnetic radiation with higher energy and shorter wavelengths than ultraviolet light. They are commonly used in the medical field for imaging and diagnostics, allowing doctors to see the internal structures of the body, including bones and soft tissues.
Each type of electromagnetic radiation has unique properties and applications, making them valuable in different fields of science, technology, and medicine. Understanding these different types of radiation is essential for their safe and effective use in various applications.
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list 3 common house hold items and 2 physical properties for each
physical properties for a bar of soap: hardness and color
physical properties for a book: texture and size
physical properties for tooth past: cohesiveness and taste
Answer: The correct answer is:
1. Metal pot: Hardness, fusibility
2. Glass cup: Transparent, resistant
3. Sheet of paper: White, porous
Explanation:
A physical property is one that is based primarily on the structure of the object, substance or matter, which is visible and measurable.
We can define the physical properties of an object through observation and measurement. For example, the physical properties of a wooden cube would be: dense, solid, square, wooden, organic, non-malleable, etc.
What type of chemical reaction is given by the following balanced equation: 2C8H18 + 25O2 → 16CO2 + 18H2O
Answer:
Explanation:
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O
The reaction above is a typical combustion reaction which are very common with hydrocarbons. Combustion occurs in the presence of oxygen to product carbon dioxide and water. The purpose of this reaction is to transform chemical energy into useful heat energy. Most times, the oxygen used is always in excess of the hydrocarbon reacting with it.
The balanced equation 2C8H18 + 25O2 → 16CO2 + 18H2O represents a combustion reaction where the octane fuel reacts with oxygen to produce carbon dioxide and water.
Explanation:The type of chemical reaction given by the balanced equation 2C8H18 + 25O2 → 16CO2 + 18H2O is a combustion reaction.
In a combustion reaction, a substance combines with oxygen to produce carbon dioxide and water vapor. In this case, the octane fuel (C8H18) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced equation shows the stoichiometric ratio of all the reactants and products.
This type of reaction is commonly seen in the burning of fossil fuels, such as gasoline, where a hydrocarbon combines with oxygen to release energy.
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Which hydrocarbon is an unsaturated hydrocarbon?
A.
2-methylheptane
B.
3-ethylpentane
C.
1-hexene
D.
cyclopentane
[tex]\boxed{\text{C. 1-hexene}}[/tex] is an unsaturated hydrocarbon.
Further Explanation:
Hydrocarbons:
The organic compounds consisting of hydrogen and carbon atoms alone are called hydrocarbons. Such compounds can be aromatic, aliphatic, linear, branched or cyclic. Aromatic hydrocarbons, alkanes, cycloalkanes are different types of hydrocarbons.
Types of hydrocarbons:
(I) Saturated hydrocarbons
These are variety of hydrocarbons that contain only single bonds in them and are the simplest hydrocarbons. Saturated hydrocarbons have the general formula of [tex]\text{C}_{\text{n}}\text{H}_{\text{2n+2}}[/tex] in which n indicates the number of carbon atoms present in it. Examples of saturated hydrocarbons are methane, ethane, butane and propane.
(II) Unsaturated hydrocarbons
The type of hydrocarbons that has multiple bonds in them are known as unsaturated hydrocarbons. Multiple bonds can be either double or triple bonds. Alkenes are those unsaturated hydrocarbons consisting of double bonds in them. For example, ethene, propene, and pentene are alkenes. Alkynes refer to unsaturated hydrocarbons with triple bonds in them. Ethyne and propyne are examples of alkynes. Alkenes are represented by general formula, [tex]\text{C}_{\text{n}}\text{H}_{\text{2n}}[/tex] while alkynes are represented by general formula of [tex]\text{C}_{\text{n}}\text{H}_{\text{2n-2}}[/tex] .
Alkanes use ‘ane’ as suffix in their naming. Alkenes use ‘ene’ as suffix while ‘yne’ is used in naming of alkynes.
Since 2-methylheptane, 3-ethylpentane and cyclopentane have suffix ‘ane’ in their names and are tered as saturated class of hydrocarbons called alkanes. But 1-hexene has suffix ‘ene’, indicating that it belongs to unsaturated hydrocarbons called alkenes. Therefore 1-hexene is an unsaturated hydrocarbon.
Learn more:
1. What is the empirical formula of the compound? https://brainly.com/question/6126420
2. Write the name of the hydrocarbon: https://brainly.com/question/3551546
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Hydrocarbons
Keywords: hydrocarbons, saturated, unsaturated, alkene, alkyne, CnH2n+2, CnH2n, CnH2n-2, double bonds, triple bonds, single bonds, 1-hexene, cyclopentane, 2-methylheptane, 3-ethylpentane.
The compound which is an unsaturated hydrocarbon is 1-hexene.The correct option is C.
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.
Organic compounds have single,double or triple bonds due to which the single organic compounds are saturated while the other two are unsaturated hydrocarbons with suffix '-ene' or '-yne'.
Thus, the correct option is C.
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Because of surface tension, a liquid _____.
resists flowing
forms droplets
forms a crystalline solid
takes the shape of its container
Answer:
The correct answer is forms droplets
A cookie recipe calls for 1 pound of butter. How many grams of butter would be needed for 3 batches
Answer: 1,360.776 grams
Explanation: given that a recipe/batch
requires 1 pound of butter
3 pounds would require x
Crosss multiplying we have
X=3 pounds
Converting pound to grams
1 pound =453.592grams
3pound =x grams
Xgrams =453.592*3
X=1,360.776 grams
How does density determine whether an object will float?
Answer:
if the object is denser then the substance, it will sink, the less dense the object is then it will float
Explanation:
i got it right in my test. :) have a good day
When does phenolphthalein turn pink?
Answer:
The correct answer is in the presence of a base.
Explanation:
Phenolphthalein is a pH indicator, which is generally colorless, however, it changes from pink to purple when encounters with the alkaline solutions. The compound phenolphthalein functions in a distinct way as it is colorless naturally, however, it turns from pink to dark pinkish color in alkaline solutions. Throughout the range of acidic pH levels, the compound stays colorless, however, it starts to turn pink at the pH of 8.2, that is, basic, and goes towards the bright purple color in stronger alkalines.
1.2 L sample of gas is determined to contain 0.5 moles of nitrogen. At the same temperature and pressure, how many moles of gas would there be in a 20 L sample?
A 20 L sample of the gas contains 8.3 mol N₂.
According to Avogadro’s Law, if p and T are constant
V₂/V₁ = n₂/n₁
n₂ = n₁ × V₂/V₁
___________
n₁ = 0.5 mol; V₁ = 1.2 L
n₂ = ?; V₂ = 20 L
∴n₂ = 0.5 mol × (20 L/1.2 L) = 8.3 mol
2h20 The underlined portion of the chemical formula above represents the _____, which tells _____________________.
Answer : A chemical formula usually represents the chemical species involved in a chemical reaction. It gives a clear information about the chemical proportions of atoms present in an chemical compound.
This chemical formula usually employs the use of chemical element symbols, numbers, etc.
Also, sometimes other symbols are also used like parentheses, dashes, brackets, commas and plus (+) or minus (−) signs.
In the given question [tex]2H_{2}O[/tex] where 2 represents the number of hydrogen atoms present in that chemical species (water molecule), The number of oxygen atom is one because it doesn't has any number before it.
The subscript [tex]H_{2}[/tex] represents the valency of hydrogen, which is 2 here. In all if we have to calculate the total number of hydrogen in this water molecule which is 4 because 2 X 2=4; this is because 2 hydrogen is multiplied with 2 valency of hydrogen.
The answer is:
Coefficient; how many water molecules there are.
Please help me, will mark brain whoever answers the fastest!
Page 1
1: The grass
2: The grasshopper
3: The frog
4: The snake
5: The eagle
Page: 2
The answer is the 2nd one
Page: 3
The owl would because its at the end it would have almost no more sun energy left in whatever it eats.
Hope This Helps :)
Grass, Grass Hopper, Frog, Snake, then Hawk.
For the food web question, it would be the third option because most organisms eat more than one thing.
The original source of energy in most ecosystems is the sun.
The owl would receive the least amount of energy because each level of the food chain only gains 10% of the organisms energy.
what is the difference between a regular and an irregular solid?
choices for images
A.
The reaction between A and B is reactant favored.
B.
The amount of product is greater than the amount of reactant.
C.
The reaction uses all its reactants to form products.
D.
The reaction reaches equilibrium at 1.5 seconds.
E.
The amount of reactants is highest at equilibrium.
#2
This chemical equation is not balanced:
AgBr(s) → Ag(s) + Br2(g).
Why isn’t it possible for the reaction to occur as indicated by the unbalanced equation?
A.
There are more substances on the right side of the equation than on the left side.
B.
There is a gas on the right side of the equation but not on the left side.
C.
The bromine atoms must go through a liquid state before becoming a gas.
D.
There is more mass represented on the right side of the equation than on the left side.
E.
The bromine atoms on the right side of the equation are not bonded to another element.
1. I think its B but im not sure imma check again
2. Its D fo sho
One
Let's start by stating what we know is wrong. Equilibrium is achieved when the reactants and products have a stable concentration. That makes D incorrect. Equilibrium is not established until about the 6th or 7th second.
The fact that you get any products at all means that the reactants will become products. Just who is favored has to be looked at very carefully. The products start very near 0. They go up until their concentration at equilibrium. When the reach equilibrium, the products have increased to 17. The reactants have dropped from 40 to 27. By a narrow margin, I would say the products are favored.
C is incorrect. There are still reactants left.
E is incorrect. the reactants started out with a concentration of 40. The reaction is not instantaneous. The concentration was highest at 40 or right at the beginning. This assumes that the reactants were mixed and the products were produced and the water/liquid amount has not changed.
B is incorrect. The concentration of the reactants is higher at equilibrium.
A is wrong. It is product favored.
I'm getting none of the above.
Problem Two
AgBr is insoluble (very). You'd have to work very hard to get them to separate into their elemental form. Just putting AgBr in water isn't enough. Lots of heat and lots of electricity are needed to get the elemental form.
I suppose you should pick B. Mass must be preserved. But if you balanced the equation, it would work with heat and electricity.
When large masses of magma solidify very slowly far below earths surface, they form igneous rocks that have a ___?
A. Glassy textures
B. Classic textures
C. Fine-grained textures
D. Coarse-grained textures
The answer is; D,
Because these rocks cool slowly, the rocks are able to form large crystals hence giving the rock a coarse texture. These crystals are big enough to be viewed with the unaided eye. The opposite is extrusive rocks that form on the surface of the earth. These cool rapidly and form fine-grained textured rocks because of the small crystals formed during the rapid cooling process.
Final answer:
Large masses of magma that cool very slowly beneath Earth's surface form igneous rocks with a coarse-grained texture, known as intrusive or plutonic rocks, such as granite.
Explanation:
When large masses of magma solidify very slowly far below Earth's surface, they form igneous rocks that have a coarse-grained texture. This slow cooling process allows large mineral crystals to grow, making them visible to the eye. These rocks are known as intrusive or plutonic igneous rocks, such as granite, which is characterized by a proliferation of light-colored minerals in a coarse-grained matrix. In contrast, rapid cooling of magma at or near the surface leads to fine-grained or glassy textures, typical of volcanic or extrusive igneous rocks, like basalt and obsidian.
In summary, the relationship between cooling rates and the grain size of minerals within igneous rocks is a key factor in their classification and subsequent geological interpretation. The development of these textures, whether coarse or fine, reflects the cooling history and mineral composition of the magma from which they are formed. Option D
In the chemical formula O2, what does the number 2 mean?
Consider the reaction. At equilibrium, the concentrations of the different species are as follows. [NH3] = 0.105 M [N2] = 1.1 M [H2] = 1.50 M What is the equilibrium constant for the reaction at this temperature?
Hey there!:
The reaction is as follows:
N2(g)+ 3 H2(g) ⇌ 2 NH3(g)
At equilibrium, the concentrations of the different species are as follows.:
[NH3] = 0.105 M
[N2] = 1.1 M
[H2] = 1.50 M
The equilibrium constant for the reaction is given as follows:
Keq = [NH3]² / [N2] [H2]³
Keq = (0.105)² / [1.1] [1.50]³
Keq = 0.00296 or 0.0030
The equilibrium constant for the reaction at this temperature is 0.0030.
Hope that helps!
Answer:
A
Explanation:
What is the process that moves sediments called?
Erosion is the process in which rocks are transported from one location to another. Not to be confused with weathering.
Which metal is most likely to be brittle? beryllium iron gold
beryllium, iron,gold most brittle to least :) hop this helped
Answer:
The answer is option 1, Beryllium.
Explanation:
How are elements organized in the periodic table
Darwin observed how farmers and breeders produced many kinds of farm animals and plants. These plants and animals had traits that were desired by the farmers and breeders. He also noticed how the study of similar body structures and vestigial organs could add to the evidence of evolution. After performing several breeding experiments, he came to certain conclusions and formulated some theories. His theory of evolution and natural selection is the most accepted one. What is the reason behind the acceptance of Darwin's theory? A) It is supported by practical evidence and examples. B) It is supported by its harmonizing with other views. C) It is based on the ideas of earlier hypothesis and laws. D) It is based on the practical example of Lamarck’s theory
the answer is A......
it is supported by practical evidence and examples. this is the answer because he tried and tested many different ways to see what would happen so he is happy with the conclusion that what he tested is what he gets.
The correct answer is A.
Which element is likely to be the most reactive?
1bromine
2chlorine
3fluorine
4iodine
Answer:
c fluorine
Explanation:
A student intends to titrate a solution of a weak monoprotic acid with a sodium hydroxide solution but reverses the two solutions and places the weak acid solution in the buret. After 23.75 mL of the weak acid solution has been added to 50.0 mL of the 0.100 M NaOH solution, the pH of the resulting solution is 10.50. Calculate the original concentration of the solution of weak acid
Hey there!
weak acid = HA
is titrated with NaOH
then :
V = 23.25 mL of weak acid
V = 50 mL base, M = 0.1 M base
pH= 10.50
find original solution of acid :
mmol of base initially = MV = 0.1*50 = 5
mmol of acid added = let it be "x"
After addition :
mmol of base left = 5-x
from pH :
pOH = 14-pH = 14-10.50 = 3.5
[OH-] = 10^-pOH = 10^-3.5 = 0.0003162 M left
V total = 23.25 + 50 = 73.25mL
mmol of OH- left = MV = 73.25*0.0003162 = 0.023161
Then :
mmol of acid added = (5-0.023161) = 4.976839
mmol of acid added was = 4.976839
[HA] = mmol of aid/Vadded
= 4.976839 / 23.25 = 0.21405 M
[ HA ] = 0.21405 M
Hope that helps!
As a skateboarder moves down hill some of the energy is