Answer:
Brady's reagent or Borche's reagent, is prepared by dissolving 2,4-dinitrophenylhydrazine in a solution containing methanol and some concentrated sulfuric acid. This solution is used to detect ketones and aldehydes.
Answer:
It is 2,4-dinitrophenylhydrazine, it confirms presence of a carbonyl functional group [ hydrazine and ketone ]
Explanation:
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why do you have to pay for everthing it should be free for new user for like a week
Sterling silver is 92.5% silver and 7.5% copper. Its density is 10.25 g/cm3. A sterling silver pendant is added to a graduated cylinder filled with 50.0 mL of water. The volume rises to 61.3 mL. What is the mass of copper contained in this pendant?
From the information given:
The volume of the graduated cylinder = 50.0 mLwhen a sterling silver pendant is added, the volume increases to = 61.3 mL∴
The volume of the sterling silver pendant is:
= 61.3 mL - 50.0 mL
= 11.3 mL
Since, 1 mL = 1cm³
Then;
11.3 mL = 11.3 cm³
the density of the sterling silver = 10.25 g/cm³Using the relation for Density; i.e.
[tex]\mathbf{Density = \dfrac{mass}{volume}}[/tex]
[tex]\mathbf{10.25 \ g/cm^3= \dfrac{mass}{11.3 \ cm^3}}[/tex]
mass = 10.25 g/cm³× 11.3 cm³
mass of the sterling silver = 115.825 grams
Recall that sterling silver has:
92.5% silver and;7.5% copper∴
The mass of the copper contained in the sterling silver pendant can be calculated as:
[tex]\mathbf{= \dfrac{115.825 \ g \times 7.5}{100}}[/tex]
= 8.687 grams
Therefore, we can conclude that the mass of the copper contained in the sterling silver pendant is 8.687 grams
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A rock has been placed in water. The mass of the rock is 20g. What is the rocks density
Answer: 20g/(volume of water displaced)
Explanation: Density = Mass/Volume Once the volume of displaced water is known, divide the 20 grams by the volume.
A metal has a density of 11.3 g/cm^3. If a sample of this metal has a mass of 25.210 g, then its volume must be ?
Taking into account the definition of density, the volume of an object with a mass of 25.210 mL and a density of 11.3[tex]\frac{g}{cm^{3} }[/tex] is 2.23 cm³.
First of all, density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that relates the mass and volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
Density, according to the International System of Units, is usually expressed in kilogram per cubic meter ([tex]\frac{kg}{m^{3} }[/tex])or gram per cubic centimeter ([tex]\frac{g}{cm^{3} }[/tex]).
In this case, you know:
density= 11.3 [tex]\frac{g}{cm^{3} }[/tex]mass= 25.210 gvolume= ?Replacing in the definition of density:
[tex]11.3\frac{g}{cm^{3} }=\frac{25.210g}{volume}[/tex]
Solving:
volume× 11.3 [tex]\frac{g}{cm^{3} }[/tex]=25.210 g
[tex]volume=\frac{25.210g}{11.3\frac{g}{cm^{3} }}[/tex]
volume= 2.23 cm³
In summary, the volume of an object with a mass of 25.210 mL and a density of 11.3[tex]\frac{g}{cm^{3} }[/tex] is 2.23 cm³.
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brainly.com/question/952755?referrer=searchResults brainly.com/question/1462554?referrer=searchResultsWhat do you know about the corpuscular nature of matter?
Answer:
It is a simple and clear account of the development of the codpuscular or, as sortie prefer to call it, the electronic, theory, of matter to explain the passage of electricity through metals and gases.
Explanation:
THE present volume is an expansion of six lectures delivered by; Prof. J. J. Thomson in his capacity of professor at: the Royal Institution. It is a simple and clear account of the development of the corpuscular, or, as sortie prefer to call it, the electronic, theory, of matter to explain the passage of electricity through metals and gases. The last two chapters are devoted to consideration of the properties of model atoms built up of corpuscles, and the evidence in favour of the view that the number of the corpuscles in an atom is about the same as its atomic weight in terms of hydrogen.
1. What was the evidence that a salt was produced? Explain how that evidence was achieved.
2. Where do you predict the water (H2O) that was produced has come from?
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1.Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite. Salt is present in vast quantities in seawater. The open ocean has about 35 grams (1.2 oz) of solids per liter of sea water, a salinity of 3.5%.
2.Water (chemical formula H2O) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent[1]). It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°.[2] "Water" is the name of the liquid state of H2O at standard conditions for temperature and pressure.
Explanation:
hope it is helpful for you have a nice dayWhat is the most stable element in the universe (in terms of binding energy)?
A. uranium
B. gold
C. iron
D. hydrogen
E. helium
F. lead
G. water
Answer:
C).Iron
Explanation:
Iron has a binding energy of 8.8MeV
Example of movable and fixed pully.
Answer:
A good example of a fixed pulley is a flag pole: When you pull down on the rope, the direction of force is redirected by the pulley, and you raise the flag. ... Examples of movable pulleys include construction cranes, modern elevators, and some types of weight lifting machines at the gym.Which of the following best describes the make up of Saturn's rings?(1 point) solid bands of sand and dust that formed from the start of the universe solid bands of sand and dust that formed from the start of the universe material from comets that have passed through Saturn's atmosphere material from comets that have passed through Saturn's atmosphere dust, rock, and ice particles that orbit due to Saturn's gravity dust, rock, and ice particles that orbit due to Saturn's gravity debris and rocks from other planets that orbit around Saturn
Answer:
Which of the following best describes the make up of Saturn's rings?(1 point) solid bands of sand and dust that formed from the start of the universe solid bands of sand and dust that formed from the start of the universe material from comets that have passed through Saturn's atmosphere material from comets that have passed through Saturn's atmosphere dust, rock, and ice particles that orbit due to Saturn's gravity dust, rock, and ice particles that orbit due to Saturn's gravity debris and rocks from other planets that orbit around Saturn
The make up of Saturn's ring are dust, rock, and ice particles that orbit due to Saturn's gravity"
Saturn is one of the 9 planets of the solar system. It is considered to be the second largest planet.
Saturn has seven large rings orbiting around it. These rings are believed to be pieces of comets, asteroids, or shattered moons that broke up before they reached the planet. And this shattered comets or asteroid are believed to be torn apart by Saturn's powerful gravity.
These comets or asteroids are made of billions of small chunks of ice and rocks which are covered or coated with other small materials such as dust particles.
Thus, the correct option that matches the above explanation is "dust, rock, and ice particles that orbit due to Saturn's gravity"
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RUNNING OUT OF TIME! !!Please HELP!!
Which option describes the particles of water as liquid water actively boils to become steam?
A. The particles will gain kinetic energy and increase temperature during boiling.
B. The particles lose kinetic energy and decrease temperature during boiling.
C. The particles will have the same average kinetic energy and the same temperature during boiling.
D. The particles will have the same average kinetic energy and a decrease in temperature during boiling.
Answer:
correct answer is A
Explanation:
The option which describes the particles of water as liquid water actively boils to become steam is: A. The particles will gain kinetic energy and increase temperature during boiling.
Water refers to a liquid molecule that is typically made up of two (2) main chemical elements; hydrogen and oxygen in the ratio of two (2) to one (1) [2:1].
Generally, the boiling point of water is approximately at one hundred (100) degrees Celsius and at this temperature, water is typically converted into steam. This is usually as a result of the fact that, the particles of water gains more kinetic energy and an increase in temperature as it boils to become steam.
In conclusion, heating water causes its temperature to increase and the water molecules would gain kinetic energy as it actively boils to become steam.
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how did your estimated poputation size
compare with the actual population size
Answer:
HE coracle—as I had ample reason to know before I was done with her—was a very safe boat for a person of my height and weight, both buoyant and clever in a seaway; but she was the most cross-grained, lop-sided craft to manage. Do as you pleased, she always made more leeway than anything else, and turning round and round was the manoeuvre she was best at. Even Ben Gunn himself has admitted that she was "queer to handle till you knew her way."
Explanation:
a wooden baseball bat is an example of
a: compound
b: element
c: heterogeneous
d: homogeneous
A wooden baseball bat is an example of a heterogeneous substance.
A heterogeneous substance is consists of compounds that are not thoroughly mixed together.
Woods are fibrous structural substances with spaces present in trees and other woody plants' stems as well as roots. They are composed of a natural composite of cellulose fibers and are contained with a lignin matrix that is capable of resisting compression.
They can use for fire, building, the manufacture of weapons and tools, furniture, as well as paperwork.
Wood is a heterogeneous, highly porous cellular material. It is made up of cells and the cell walls are made up of roughly 40% cellulose, 15% hemicellulose, and lignin of about (15–30%).
Therefore, we can conclude that a wooden baseball bat is an example of a heterogeneous substance.
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Which one of the following is NOT the unit of wave number:
m-1
cm-1
mm-1
cm
Answer:
e
Explanation:
cm is not the unit of wave number out of the following.
What is a wave number?Definition: Total number of wave cycles present in a unit distance is termed a wave number.
Wave number is always a reciprocal of the unit of distance.Wave number is denoted by the letter 'k'.The formula for wave number is 2π/λ where λ is the wavelength. Since wave number is always reciprocal, cm is not the unit for a wave number. The higher the wave number, the higher the frequency and energy.To learn more about wave number, refer to:
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What are the variables used in an experiment? How are they different?
Answer:
There are many items that could be altered to test the reaction of another. These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
Explanation:
assuming that you attend school 180 days a year for 8 hours a day from first through 12th grade youd be in class for a total of 2160 school days how many total years would you have been in school by the time you graduate
Answer:
2160 days divided by 365 days which is a year is equal to about 5.9 years in school * sighhh*
5.91780821918
Which functional group does ethylamine contain? please help I need to finish this test ASAP
Answer:
its A -NH2 (vmxkgcjfxjfkhcfgk)
How many moles of oxygen atoms are there in 1 mole of Mg(NO3)2?
Answer:6 moles
Explanation: u said atoms so O₁ = 1 mole so there is a total of 6 atoms of oxygen so 6 moles is the ans.
The purpose of graphs, charts and tables is to?
What is the rate law?
Answer: B
Explanation:
The rate law is the mathematical equation that describes how reactant concentration changes as a function of time. A law such as "Rate = k*[A]*[B]" means that, for each liter-equivalent of the reactant(s) A, there are k liters of reactant B. The law also dictates the molarity (and thus partial pressure) for each component in solution.
3.
Carlos is trying to figure out the best place to put his router in order to get the best
signal. Which is not an independent variable?
A. Distance from the router
B. Signal strength at the computer
OUTPU
C. The number of walls between the router and computer
STATIO
D. The number of devices on the router
Answer:
right answer is option no c
For most of a star's life it will use this element for it's fuel. just 1 answer
3
Using the average experimental value for the density of your unknown metal, calculate the
agine a large sample of the same metal weighed 950 pounds. Calculate as volume in cubic meters using
dimensional analysis fie, use conversion factors and show unit cancellation. Start with 950 lbs...)
Unit conversion using dimensional analysis is performed by multiplying the given unit with the conversion factor
The volume of a 2 ft.³ in cubic meters is approximately 0.056634 m³
The given mass of the sample of metal, m = 950 pounds
The units of density using the imperial units = [tex]lb_m[/tex]/ft.³
The units of the volume of the metal sample based on the above density = Cubic feet
The desired units = Cubic meters
The conversion factor for converting a unit in cubic feet to a unit in cubic meters is presented as follows
1 ft.³ = 0.0283 m³
Therefore, using dimensional analysis, the volume quantity in cubic feet is multiplied by 0.0283 m³/(1 ft.³) to convert the volume to cubic meters
Example;
Given that the volume of the metal sample 2 ft.³, we have that the volume in cubic meters is therefore;
2 ft.³ × (0.0283 m³)/(1 ft.³) ≈ 0.056634 m³
The volume of a sample of metal that is 2 ft.³ in cubic meters is ≈ 0.056634 m³
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heterogeneous mixture homogeneous
How are they similar?
Answer:
By definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers. Each of the layers is called a phase.
Explanation:
When multiplying 602.4 m by 3.72 m, which value determines the number of significant figures in the answer? Explain.
The values that determines the number of significant figures in the answer is 3.72
In mathematics and science, a significant figure refers to any figure that contributes to the degree of accuracy of a value that is being measured.
The value having the value having the least number of significant figures in a multiplication determines the number of significant figures in the answer.
In this case, 3.72 has the least number of significant figures hence it determines the number of significant figures in the answer.
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Answer:
3.72
Explanation:
3.72 has the least number of significant figures which means the number of significant figures is the answer.
What units do you use to measure mass?
inches
feet
milliliter
gram or kilogram
Answer:
gram or kilogram
Explanation:
these are the only ways for mass of the options
Answer:
unit of the mass is kilogram that the answer
The steps in every scientific investigation must_______________________.
A. follow exactly the same sequence.
B. begin with a hypothesis
C. include the development of a theory.
D. be performed in a logical sequence.
Answer:
B. begin with a hypothesis
Explanation:
How many atoms? H_____, O_____, Fe_____ Total atoms? _____ 3Fe(oh)2
Answer:
H = 6
O = 6
Fe = 3
Total atoms = 15
Explanation:
3Fe (OH)2
Fe = 1×3
O= 2× 3 = 6
H= 2× 3 = 6
Total atoms = 6+6+3=15
I hope I helped you^_^
How many moles are in 2.5 g of N2?
0.089
Explanation:
2.5/ 14= .178 then 0.178/ 2 again and you get 0.089
Answer:
Molar mass of nitrogen gas = (14 × 2) = 28 g
But molar mass is 1 mole
[tex]28 \: g \: are \: 1 \: mole \: of \: nitrogen \\ 2.5 \: g \: are \: \{ \frac{2.5 \times 1}{28} \} \: moles \\ \\ = { \boxed{ \boxed{0.089 \: moles}}}[/tex]
explain the importance of the periodic table
Answer:
the importance of the periodic table are,
To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.
Explanation:
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thank you
have nice day
what happens when a burning splinter is introduced in gas jar containing carbon dioxide
Answer:
Explanation:
when a burning splinter is introduced into a jar of carbon dioxide the burning fire gets puts out due to the presence of carbon dioxide which is a colorless odorless gas that prevents the burning of fire
