The best way to represent the concentration of a 1.75 m K₂CrO₄ solution is [K₂CrO₄] = 1.75M.
What is concentration?Concentration of any substance will give idea about the quantity of that substance present in given volume.
Concentration will be express in many ways like molarity, molality, mole fraction and so on. And to express the quantity in concentration we will use the big square closed bracket like this [ ].
Hence, best way is [K₂CrO₄] = 1.75M.
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Answer:
B.
Explanation:
Cement, if a rectangular piece 2,00cm x 2.00cm x 9.00cm has a mass of 108g. Find the density in g/cm^3
Answer:
answer will be 3 g/cm^3Explanation:
[tex]density \: = \frac{mass}{volm} [/tex]
20 Points! A student takes a beaker with distilled water and dissolves 30.0 grams of salt into the beaker of water. He realizes he forgot to measure the mass of the water before-hand! The end mass of the beaker with salt water is 851.0 grams and the empty beaker originally has a mass of 412.0 grams. What is the mass of the distilled water?
Answer:
409.0 grams
Explanation:
total mass-(mass of salt+mass og empty beaker)
Answer:
442
Explanation:
og empty beaker + salt
A sample of gas has a volume of 606 mL at 35 ° C. What temperature is necessary for the
gas to have a volume of 854 ml?
A 49 K
B. 707K
C 219 K
D. 434 K
Answer: 434 Kelvin
Explanation:
Assuming pressure is constant, the formula: V / T = V / T can be used.
However, all temperatures must first be converted to Kelvin by adding 273 to them:
(35 + 273) = 308K
Now, plug in: 606 / 308 = 854 / T → 1.98753T = 854 → 434 K :)
True or false? Most salts found in the ocean originated on land
Answer:
false \
explaintion
then wound pond and lakes be salt water
The salt in the ocean mainly comes from runoff from the land and openings in the seafloor. So, I would say false.
PLS HELP ASAP DUE AT 11:59 AND IM MARKING BRAINLIEST
PLS DO NOT ANSWER IF YOUR NOT SURE ABOUT YOUR ANSWER. this is science btw.
Answer:
In the followings below, the one that doesn't attract to magnets is:
Option 4, Aluminum.
Explanation:
Mainly because of the aluminum's crystal structure.
Hope this helped you out! ^^
#CarryOnLearning
Answer:
Aluminum
Explanation:
Ferromagnetic Metals
Ferromagnetic metals and alloys are the only magnetic metals. Out of all of the elements on the periodic table, there are only 3 metals that are attracted to magnets: iron, nickel, cobalt.
Aluminum
Aluminum is a nonferrous metal (meaning not including iron or steel) that does not include any ferromagnetic metals. Additionally, aluminum itself is not magnetic, so there is no attraction between aluminum and a magnet.
2) How many moles are in 3.34 x 10^24 molecules of C6H1206?
Answer:
5.55 mol
Explanation:
1 mole of any substance is equal to 6.022 × 10²³. So, if we do
3.34 x 10^24 * 1 / 6.022 × 10²³ is equal to 5.55 mol.
An analysis showed there is 0.010 mol KOH in a 10. kg sample of water. What is the concentration of KOH in ppm?
___ppm
Answer:
56.1 ppm
Explanation:
Molar mass of KOH is 56.1g
Mass of 0.01 mole of KOH = 0.561g
Mass of water = 10kg = 10000g
Concentration of KOH in ppm = 0.561 / 10000 * 1000000
= 56.1 ppm
Moles of KOH=0.01mol
Mass of KOH=0.001(56.1)=0.561gConcentration of KOH:-
[tex]\\ \rm\Rrightarrow 0.561/10=0.561nm[/tex]
[tex]\\ \rm\Rrightarrow 56.1ppm[/tex]
When should a lab coat, safety goggles, and gloves be worn in the laboratory?
always, no exceptions
always, unless the teacher instructs otherwise
only when the teacher says to wear them
never in chemistry labs
Answer: the answer is a
Explanation:
you should always keep lab coat on when in lab
Answer:
its A. chemistry labs have a lot of things that can hurt you, even with just a few drops . its one of the most dangerous experiment types you do in science. even if your not doing an experiment but your in the room you should have on protection in case of a spill or something. it is always impotent to have safety gear on. even more so in chemistry
which of the following elements has the lowest electronegativity?
A. Strontium (Sr)
B. Magnesium (Mg)
C. Calcium (Ca)
D. Barium (Ba)
Answer: It’s D. Barium (Ba)
Explanation:
If you wanted to find a sample of fermium,which has an atomic mass of 100,where would i look???
If you wanted to find a sample of fermium,which has an atomic mass of 100 I would look deep under the earth
Assume that each finch comes from a large population of similar finches in its particular environment. Imagine a drought in the environment of Finch 1 makes the small seeds they normally feed off of scarce. Describe how natural selection could cause the population of finches in the first group to evolve over time to resemble the population of Finch 2.
By the process of natural selection, individuals in Finch 1 will evolve over time to resemble individuals in Finch 2.
What is natural selection?Natural selection is the process by which individuals who possess certain features or structures that make them better suited to their environment are able to survive and reproduce in their environment while those who do not have such features die off.
Since the preferred food for Finch 1 has become scarce due to drought, individuals in Finch 1 who have features that enable them eat larger seed will be naturally selected for survival , most population in Finch will be composed of such individuals.
Therefore, natural selection will cause individuals in Finch 1 to evolve over time to resemble individuals in Finch 2.
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Which phrase best describes a metaphoric rock?
A. Formed from a volcano
B. Was once buried underground
C. Formed from evaporating water
D. Contains minerals that have not changed
Answer: A/B
Explanation:
It is most likely formed from igneous rock that was once buried
Answer: a
Explanation:
10pts.
Does not occur naturally, only in nuclear power plants or nuclear bombs:
Fission
Fusion
Both
sorry I'm not smart.
Answer:
Fusion
Explanation:
Fission definition:
In nuclear physics and nuclear chemistry, nuclear fission is a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into two or more smaller, lighter nuclei.
Fusion definition:
Nuclear fusion is the process by which two or more atomic nuclei join together, or “fuse,” to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy, which is released.
Both together: (vs.)
Both fission and fusion are nuclear reactions that produce energy, but the applications are not the same. Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.
hello people ~
The combustion reaction which occurs on its own, without any external supply of heat is called as:
A. Explosion
B. Spontaneous combustion
C. Fire
D. Rapid combustion
Answer:
B. Spontaneous combustion
Explanation:
If the reaction is happening completely on its own, it is spontaneous!
Hopefully this helps- let me know if you have any questions!
Select the correct answer. Which orbitals can overlap to form a pi bond? A. Two p orbitals B. One s orbital and one p orbital C. One s orbital and one hybrid orbital D. Two hybrid orbitals E. Two s orbitals.
Two p orbitals of atoms can overlap to form a pi bond in any molecule.
What are pi bond?Pi bonds are come under the categories of multiple bond as in any molecule first molecule is the sigma bond, and the second bond is the pi bond.
Pi bonds are the result of the side or lateral overlapping of the un-hybrid orbitals. Orbitals which takes part in the formation of pi bonds are p-orbitals and in the pi bonds, electron density is present above or below the pi bond.
Hence, option (a) is correct, i.e. two p-orbitals overlap to form a pi bond.
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The diagram shows the motion of a group of water molecules over a heat source.
How do the molecules at point A compare to the molecules at point B?
They are farther apart.
They have increased in size.
They have lost energy.
They are moving slower.
The molecules at point A are farther apart than the molecules at point B due to increase in temperature.
.
How does temperature increase affect water molecules?Temperature is a measure of the average kinetic energy of the particles of a substance.
The higher the temperature, the greater the kinetic energy of the molecules.
When water molecules are heated, the molecules acquire greater kinetic energy and move further apart.
Therefore, the molecules at A are farther apart than those at B.
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Write a message to Eric Wu explaining when he can photograph a lunar eclipse and why lunar eclipses happen.
Claim 1: A lunar eclipse can be photographed any time Earth is in between the sun and the Moon.
Claim 2: A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.
A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.
Why lunar eclipse occur?A lunar eclipse occurs when the Sun, Earth, and Moon align in the same line in which the Moon passes into Earth's shadow. In a total lunar eclipse, the entire Moon falls within the darkest part of Earth's shadow, called the umbra so we can conclude that claim 2 is the right answer about lunar eclipse.
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How can magnets store energy?
During break time, you bought a magnum ice cream to your crush to show your gratitude in helping her during the previous activity. You bought a pair of magnum even though you don't have enough money. Thanks to your best friend who is always there to support you in times of need. As you approach her with confidence, you saw her talking to the person you saw last time in the canteen. As you turned around and leave, she called you. You have no choice but to confront her even though you feel that your heart is filled with sorrow. Then suddenly she introduced her brother. Your face turns to read with delight and also wonder? You told her that you didn't see her brother in IG, YT,FB or even tweeter. (such amazing stalker you are) then she told you the whole story to the point that you forgot to give the magnum ice cream that melted for some times in your hand. What phase change is being undergone as the magnum ice cream melt?
Answer:
Solid---> Liquid
Answers please
I will give brainliest
Answer: it is group1 or group 3 on god
Explanation:
Consider the reaction in chemical equilibrium. COCl2(g) Double headed arrow. CO(g) Cl2(g) Which is the correct equation for K? Upper K = StartFraction left-bracket Upper C Upper O Upper C l Subscript 2 Baseline right-bracket Superscript 2 Over left-bracket Upper C Upper O right-bracket left-bracket Upper C l Subscript 2 Baseline right-bracket EndFraction Upper K = StartFraction left-bracket Upper C Upper O Upper C l Subscript 2 Baseline right-bracket Over left-bracket Upper C Upper O right-bracket left-bracket Upper C l Subscript 2 Baseline right-bracket EndFraction Upper K = StartFraction left-bracket Upper C Upper O right-bracket left-bracket Upper C l Subscript 2 Baseline right-bracket Over left-bracket Upper C Upper O Upper C l Subscript 2 Baseline right-bracket EndFraction Upper K = StartFraction left-bracket Upper C Upper O right-bracket left-bracket Upper C l Subscript 2 Baseline right-bracket Over left-bracket Upper C Upper O Upper C l Subscript 2 Baseline right-bracket Superscript 2 EndFraction.
The correct equation for equilibrium constant is K = [CO][Cl₂] / [COCl₂].
How we calculate the value of K?Here K is the equilibrium constant and value of K is define as the ratio of the product of the concentration of the formed products to the product of the concentration of the reactants.
Given chemical reaction is:
COCl₂(g) ⇄ CO(g) + Cl₂(g)
In the equilibrium state, equilibrium constant will be written as:
K = [CO][Cl₂] / [COCl₂]
Hence, the correct equation for the value of the equilibrium constant is K = [CO][Cl₂] / [COCl₂].
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Answer:
Explanation:
b
What is a substance that is made up of only atoms of one type?
Answer:
Element
Explanation:
All matter is made up of very small particles called atoms. Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element.
describe how a pure dry sample of solid lead carbonate can be obtained from sodium carbonate solution and lead nitrate solution
Answer:
Soluble salts can be made by reacting acids with soluble or insoluble reactants. Titration must be used if the reactants are soluble. Insoluble salts are made by precipitation reactions.
Making insoluble salts
An insoluble salt can be prepared by reacting two suitable solutions together to form a precipitate.
Determining suitable solutions
All nitrates and all sodium salts are soluble. This means a given precipitate XY can be produced by mixing together solutions of:
X nitrate
sodium Y
For example, to prepare a precipitate of calcium carbonate:
X = calcium and Y = carbonate
mix calcium nitrate solution and sodium carbonate solution together
calcium nitrate + sodium carbonate → sodium nitrate + calcium carbonate
Ca(NO3)2(aq) + Na2CO3(aq) → 2NaNO3(aq) + CaCO3(s)
It also works if potassium carbonate solution or ammonium carbonate solution is used instead of sodium carbonate solution. Remember that all common potassium and ammonium salts are soluble.
please mark as brainliest
Explanation:
Mix lead nitrate and sodium carbonate solutions, forming lead carbonate precipitate, filter, wash, and dry.
To obtain a pure dry sample of solid lead carbonate (PbCO₃), follow these steps:
Prepare Solutions: Dissolve lead nitrate (Pb(NO₃)₂) in water to make a lead nitrate solution, and dissolve sodium carbonate (Na₂CO₃) in a separate container to make a sodium carbonate solution.
Mixing Solutions: Slowly add the sodium carbonate solution to the lead nitrate solution, drop by drop, while stirring. A white precipitate of lead carbonate will form.
Precipitate Formation: Pb(NO₃)₂(aq) + Na₂CO₃(aq) → PbCO₃(s) + 2NaNO₃(aq)
Filtration: Carefully filter the mixture to separate the solid lead carbonate precipitate from the remaining solution (filtrate).
Washing: Wash the precipitate with distilled water to remove any remaining soluble impurities.
Drying: Place the wet lead carbonate precipitate on a filter paper and let it air dry or use an oven at a low temperature. Once completely dry, a pure sample of solid lead carbonate is obtained.
This process ensures the separation of lead carbonate from the solutions and other compounds, yielding a dry and pure sample of the desired compound.
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Why do males and females have sezual relationships?
Answer:
1) There are people who want a child
2) There are people who are idiots and do it for fun.
Explanation:
It's simple I guess. lol
Answer:
All animals and living things need to reproduce to keep their species alive
Explanation:
Like the other person commented, some people want to have kids, and others do it for fun LOL.
Btw,
With other species, the animals that DO reproduce are the ones that are most likely to survive, like a green bird in a heavily forested environment would survive, while a pink bird wont. This helps protect their species and ensure that the "most likely to survive", reproduces, so their offspring also are most likely to survive!
:)
would the density of a person be the same on the earth and on the moon ? explain
Answer:
NO. The density of a person remains the same wherever they are in the universe.
Explanation:
hopes this helps have a wonderful day
Density of a person does not change with the change in planet. Because, the density depends on the mass of the object. Therefore, the density of a person in moon and earth is same.
What is density ?Density of a substance is the measure of its mass per unit volume. Density of a substance depends on the temperature and pressure. The density is thus, the ratio of mass to the volume.
Density describes how closely the particles are packed in an object. The weight of an object on other side is the mass multiplied by the gravity. Weight is a downward force acting on the object.
The weight of a person differ in earth and moon. However, density does not depends on the weight of the person but on mass only so does remains constant.
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what's the relationship between weight mass and volume
60 points please help me!
The nucleus or center area of the atom contains two kinds of subatomic particles. Which two?
protons and neutrons
protons and electrons
electrons and neutrons
protons only
Answer:
protons and neutrons
Explanation:
What best explains why the moon's surface gravity is only one-sixth of Earth's surface gravity?
A) Earth is closer to the Sun, so it has much more gravity.
B) Gravity is controlled by the tides, which are much closer to Earth than the moon.
C) The moon orbits Earth faster than Earth orbits the Sun, giving the moon less gravity.
D) Gravity is the result of an object's mass and size; the Earth is much larger than the moon.
Answer:
D) part is the correct answer
Answer:The answer is D
Explanation:The moon is a bit more than one-fourth (27 percent) the size of Earth, a much larger ratio (1:4) than any other planets and their moons. Earth's moon is the fifth largest moon in the solar system. The moon's mean radius is 1,079.6 miles (1,737.5 kilometers).
Todos los alcanos reaccionan a temperaturas altas con el oxígeno para producir dióxido de carbono y agua con liberación de mucha energía (reacción de combustión). Los motores de combustión interna convierten la energía calórica procedente de la combustión de la gasolina, ACPM, o petróleo en energía mecánica. Al quemar una muestra de gasolina que contenía 2 kg de octano del 90% de pureza; cuantos kilogramos de gas carbónico se producen ? 2C 8H18 + 25O2----------- 16 CO2 + 18H2O
Answer:
5.5kg de CO₂ son producidos
Explanation:
La reacción de combustion del octano (C₈H₁₈) es:
2 C₈H₁₈ + 25 O₂ → 16CO₂ + 18H₂O
Donde 2 moles de octano producen 16 moles de CO₂
2kg de octano = 2000g son, en moles (Masa molar octano: 114.23g/mol; Pureza del 90%):
2000g * (1mol / 114.23g) * 0.90 = 15.76 moles de octano
Asumiendo una conversión total, las moles de CO₂ producidas serán:
15.76 moles de octano * (16 moles CO₂ / 2 moles C₈H₁₈) = 126 moles de CO₂
La masa de 126 moles es (44.01g/mol):
126 moles de CO₂ * (44.01g / mol) = 5548g =
5.5kg de CO₂ son producidos