Explanation:
I)reaction between potassium paramagnet with H2 forms MnO2
if 3.38g of CuNO3 IS DISSOLVED IN WATER TO MAKE 0.220 M solution what is the volume of the solution in milliliters"
Answer:
To determine the volume of the solution in milliliters, we need to know the mass of CuNO3 and the concentration of the solution.
Given that 3.38g of CuNO3 is dissolved in water to make a 0.220 M solution, we can use the following formula to calculate the volume of the solution:
Volume = (Mass of CuNO3) / (Concentration of solution)
Plugging in the given values, we have:
Volume = (3.38 g) / (0.220 M)
Converting the mass to grams and the concentration to moles/liter, we have:
Volume = (3.38 g) / (0.220 mol/L)
Calculating, we find that the volume of the solution is approximately 15.36 liters.
To convert the volume to milliliters, we can multiply the volume in liters by 1000. In this case, the volume in milliliters is 15,360 ml.
Therefore, the volume of the solution in milliliters is approximately 15,360 ml.
Explanation:
Remember: all EM waves travel at the same __________. The equation for speed is __________ times the __________. So, for the answer to always be 300,000km/s, as one number goes __________, the other must go __________. All EM waves are __________. The higher the __________, the more __________ in the wave.
All the EM waves travel at the same speed. The equation for speed is frequency (v) times the wavelength (λ). Speed of light equals 300000 km/s. Hence one number goes to 3 × 10⁸ m and other number is 1 s⁻¹.
What is an electromagnetic wave ?Electromagnetic waves are waves moving without a medium through vacuum. They are accompanied with an electric field and magnetic field. The speed of an electromagnetic wave is the product its wavelength and frequency.
c = νλ
Therefore, the given passage can be filled as follows:
All the EM waves travel at the same speed. The equation for speed is frequency (v) times the wavelength (λ). Speed of light equals 300000 km/s. Hence one number goes to 3 × 10⁸ m and other number is 1 s⁻¹.
All EM waves are energetic. The higher the frequency the more energy in the wave.
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Which block of elements is non-reducing?
Answer: S-block elements
Explanation: Elements of S-block are prepared through the electrolysis process not by the reduction of their compounds with the other group elements of their compounds. For example in Carbon dioxide carbon is non reducing because oxidation state of `C "in" CO_(2)` is `+4`, which is maximum So it does not undergo oxidation, and hence, it is not a reducing agent.
What is the name of the charge that orbits the nucleus called?
Answer:
Electrons
Explanation:
"An electron is a negatively charged particle that orbits the nucleus of an atom."
"Electrons are negatively charged particles arranged in orbits around the nucleus of an atom"
HELP ME PLS
type an actual answer insted of saying I will help you
Answer:
develops,blossoms are synonyms
The EM Spectrum is the __________ range of EM waves in order of __________ frequency and __________ wavelength.
Answer:
entire, increasing, decreasing
Explanation:
The EM Spectrum is the entire range of EM waves in order of increasing frequency and decreasing wavelength.
The heat of vaporization for benzaldehyde is 48.8 kJ/mol, and its normal boiling point is 451.0 K. Use this information to determine benzaldehyde's vapor pressure (in torr) at 49.5°C. Report your answer to three significant digits.
The vapor pressure at 49.5 °C is:
DP = 48.8 kJ/mol / 8.314 J/mol*K * (1/451.0 K - 1/322.65 K) * 49.5
DP = 0.24 torr (approx)
The vapor pressure of benzaldehyde at 49.5°C is approximately 0.24 torr.
How to calculate heat of vaporization?The heat of vaporization (ΔHvap) and the normal boiling point (Tb) can be used to determine the vapor pressure of a liquid at a given temperature using the Clausius-Clapeyron equation. The Clausius-Clapeyron equation states that the change in vapor pressure (DP) with temperature (DT) is directly proportional to the heat of vaporization (ΔHvap) and inversely proportional to the absolute temperature (T) in kelvin.
DP/DT = ΔHvap / R * (1/T)
where R is the gas constant.
We can use this equation to solve for the vapor pressure of benzaldehyde at 49.5°C.
First, convert 49.5°C to kelvin:
T = 49.5°C + 273.15 = 322.65 K
Next, we need to use the Clausius-Clapeyron equation to solve for vapor pressure at a temperature T and the normal boiling point Tb:
DP/DT = ΔHvap / R * (1/T) = ΔHvap / R * (1/Tb - 1/T)
DP = ΔHvap / R * (1/Tb - 1/T) * DT
The vapor pressure at 49.5 °C is:
DP = 48.8 kJ/mol / 8.314 J/mol*K * (1/451.0 K - 1/322.65 K) * 49.5
DP = 0.24 torr (approx)
The vapor pressure of benzaldehyde at 49.5°C is approximately 0.24 torr.
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The vapor pressure of the benzaldehyde is 196 torr.
What is the vapor pressure?We know that the vapor pressure would have to do with the ease that we can use to convert the substance that is in question from liquid to gas. When we have two substances that are at different temperatures than we have;
ln(P2/P1) = -ΔH/R(1/T1 - 1/T2)
P2 = final pressure
P1 = initial pressure
R = gas constant
T1 = initial temperature
T2 = final temperature
Thus;
ln(P2/1) = -48.8* 10^3/8.314(1/451 - 1/322.5)
lnP2 = -5869.6(0.0022 - 0.0031)
lnP2 = 5.28
P2 =e^5.28
P2 = 196 torr
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Which of these is an example of a physical property?
A. Chlorine oxidizes bacterial cells.
B. Chlorine gas is yellow-green in color.
C. Chlorofluorocarbons (CFC's) react with ozone (O₂).
D. Potassium ignites when placed in water.
Answer:
B. Chlorine gas is yellow-green in color.
are these reactions balanced or unbalanced ?
(NEED HELP ASAP)
Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). (3 points)
1.
Adding a catalyst
2.
Removing hydrogen gas
3.
Increasing the pressure
a.
Shift to the right
b.
Shift to the left
c.
No effect
For the given reaction, according to Le -Chatlier principle adding a catalyst will bring the reaction to the right. Removing the hydrogen gas shift the equilibrium to the left and increasing pressure also shift to right.
What is Le -Chatlier principle ?According to this principle, when some a disorder is affecting the equilibrium of the system. The system balanced the factors which created the disorder and make a new equilibrium.
A catalyst always helps to proceed the reaction in the forward direction. Thus adding a catalyst shift the equilibrium to the right.
If any reactant or produced is removed from the system, the system shifts to the equilibrium to that direction in which they are producing. Removing hydrogen gas will then shift the reaction to the right to produce more hydrogen.
Increasing pressure shift the equilibrium to those direction in which the number of number of moles of gases decreases. Hence, the reaction shifts to the right here.
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The Law of Conservation of Matter states that in a closed system, matter cannot be created or destroyed. This means that atoms can NOT just appear or disappear. The mass will not change in a closed system.
This, however, is NOT what we observed. We observed that the mass of the substance in our measuring tray increased after burning.
Why do you think this happened? Where did the extra mass come from?
REMEMBER: Energy (light, heat, motion, etc.) is not made of atoms so has no mass.
RESOURCE: Access your online textbook through CLEVER, click to get the blue ribbon across the top of the page and go to the Table of Contents. Scroll down to Lesson 9 Conservation of Matter and select "Extending Your Knowledge: Mass and Matter"
Answer:
The Law of Conservation of Matter states that in a chemical reaction, matter is not created or destroyed. However, it is possible for the mass of a substance to change during a chemical reaction, as you observed.
When a substance burns, it reacts with oxygen in the air to form new compounds. For example, when wood burns, it reacts with oxygen to form water and carbon dioxide. The mass of the wood plus the mass of the oxygen is equal to the mass of the water and carbon dioxide produced.
In this case, the extra mass that you observed came from the oxygen that reacted with the wood. Oxygen has mass, and when it reacts with the wood, the mass of the resulting compounds is greater than the mass of the starting materials.
It's important to note that energy is not a form of matter, and therefore has no mass. However, energy can be converted into matter and vice versa, according to the famous equation E=mc^2, where E is energy, m is mass, and c is the speed of light. This equation demonstrates that mass and energy are fundamentally connected and can be converted into each other under certain conditions.
Explanation:
1 atm = 760 torr
For isooctane:
For tetramethylbutane:
There is no other feasible arrangement of “tetramethylbutane” it is redundant in this circumstance.
What is Tetramethylbutane?Tetramethylbutane, often known as hexamethylethane, is a hydrocarbon with the chemical formula C8H18 or (H3C-)3C-C(-CH3)3. It is the most branching and compact of the several octane isomers, as well as the only one having a butane (C4) backbone.
It has a highly symmetrical structure, a high melting point, and a narrow liquid range; in fact, it is the smallest saturated acyclic hydrocarbon that emerges as a solid at 25 °C. (Cubane, C8H8, is much smaller and solid at room temperature among cyclic hydrocarbons.) It is also the most stable C8H18 isomer, with a lower heat of formation of 4.18 kcal/mol (17.5 kJ/mol) than n-octane, which has been related to dispersive interactions (electron correlation) between the methyl groups (protobranching).
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why is it important for a consumer to know the properties of a textile fibre
A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently. It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities.
Understanding why some fabrics are more durable and so more suited for particular uses comes from studying textiles. It permits one to comprehend the rationale behind why particular materials generate cool-looking clothing in addition to creating the sense of coolness when used as décor. A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently.
It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities. Although clothes don't necessarily make a person, they certainly help to develop a positive personality and a sense of self-assurance. Housewives should therefore be familiar with clothing and textiles to obtain the best out of it.
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At which of the following temperatures is the average kinetic energy of molecules od a substance greatest
Answer:
Correct option is C)
Kinetic Energy at 20
o
C=293K
=3/2K
B
T=3/2K
B
(293)J=K.E
1
kE
2
=2K.E
1
2
2
3
K
^
B
(293)=
2
3
K
^
B
T
T=586K
=313
o
C
A student placed four magnets of equal size and mass each the same distance from an electromagnet. She turned the electromagnet on and then quickly turned it off. The diagram below shows how far each magnet traveled toward the electromagnet when the circuit was closed.
four magnets near an electromagnet
What is the order of the magnets by strength from strongest to weakest?
magnet W
magnet X
magnet Y
magnet Z
You have to put them in order
Four magnets near an electromagnet What is the order of the magnets by strength from strongest to weakest. magnet W,magnet X,electromagnet,magnet Y,magnet Z.
What is electromagnet?
An electromagnet is a type of magnet in which the magnetic field is generated by an electric current. It usually consists of a coil of wire that is wrapped around a core of magnetic material such as iron or steel.
When an electric current passes through the wire, a magnetic field is created around the core, making it a magnet. Electromagnets are used in many different applications, such as motors, generators, and speakers.
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What is the molecular weight of MgCl2
The molecular weight of MgCl₂ is 94 g/mol.
What is molecular weight?This refers to the total mass of a compound. It is equivalent to the sum of the individual atomic masses of each atom in the molecule.
Steps to determine the molecular formula of the molecule.
Determine the atomic mass of each element in the molecule.Multiply each element's atomic mass by the number of atoms of that element in the molecule. This number is represented by the subscript next to the element symbol in the molecular formula.Add these values together for each different atom in the molecule.The total will be the molecular mass of the compound.Atomic number of Cl =17
Atomic number of Mg = 12
Mass number of Cl = 35
Mass number of Mg = 24
Calculating the molecular weight of MgCl₂
MgCl₂
=(12* 2) + (35*2)
= 24 + 70
= 94 g/mol.
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Using ethylene (HC-CHz) as your only source of carbon atoms, outline a synthesis for 3- hexanone,
The organic compound 3-hexanone can be prepared from ethylene using the second method given in the options.
What is 3-hexanone?3-hexanone is an organic compound classified to the ketones. Ketones are compounds with C=O group. 3-hexnone has the carbonyl group in the third carbon in the chain.
3- hexanone can be synthesized alkene sources by first converting them to alkynes. This process is oxidation. Ethylene can be oxidized to ethyne by treating with HBr and NaNH2 followed by hydrolysis.
The obtained higher alkyne or hexyne undergone acid hydrolysis in presence of sulphuric acid giving 3-hexanone.
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Explain, in terms of subatomic particles in energy states, how the colors in a fireworks display are produced
Salts are heated to extremely high temperatures during a display of fireworks. The salts' ions pick up energy and get excited. Exciting hues are created as energy in the form of light is emitted from the ions. Each salt's metal ion can be identified by the hue of the light that is emitted.
What are subatomic particles?Subatomic particles refer to the three fundamental particles that make up the atom.
The subatomic particles include:
electronsprotons, and neutronsElectrons occupy several energy states. When electrons gain energy, they move to a higher energy state. The electrons on returning to a lower energy state emit radiation that is seen as several light color displays in fireworks.
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A certain compound consists of 54.53% C, 9.15% H, and 36.32% O by mass. The molar mass of the compound is 88.10g/mol, What is the molecular formula of this compound?
The compound is going to have the molecular formula; [tex]C_{4} H_{8}O_{2}[/tex]
What is the molecular formula?We know that the molecular formula is the formula of the compound that shows the number of the atoms of each of the elements that we can be able to find in the compound.
Now for the compound that we have, we divide through by the relative atomic mass of each;
C - 54.53/12 H - 9.15/1 O - 36.32/16
C - 4.5 H - 9.15 O - 2.27
Dividing through by the lowest ratio;
C - 4.5/2.27 H - 9.15/2.27 O - 2.27/2.27
C - 2 H - 4 O -1
The empirical formula is [tex]C_{2} H_{4} O[/tex]
We now have;
[2(12) + 4(1) + 16] n= 88.1
n = 88.1/44
n = 2
The molecular formula is;
[tex]C_{4} H_{8}O_{2}[/tex]
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Drawings/ diagram of polyatomic ions (structural formula)
PLEASE HELP I NEED IT
GIVING 100 points
PLEASE IT MAKE FAIR I NEED IMAGES OF IT
Polyatomic ions are ions made up of more than one atom.
What are Atoms?
Atoms are the smallest particles of matter that make up all objects. They are composed of protons, neutrons, and electrons. Protons and neutrons make up the nucleus of the atom, while electrons orbit around the nucleus. Atoms are the basic units of matter and are the building blocks of all living and nonliving things.
Polyatomic ions are ions that consist of two or more atoms covalently bonded together and carrying a net electric charge. Examples of polyatomic ions include nitrate (NO3−), sulfate (SO42−), phosphate (PO43−), and carbonate (CO32−).
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Calculate the mass percent composition of nitrogen in each nitrogen containing compound
Mass percent of a compound=(mass of element in molecule/total mass of compound)×100 (a) 63.64%
What is mass percentage composition ?We use the concept of mass percentage composition to explain the concentration of an element in a compound or a component in a combination. This word refers to the overall percent by mass of each element present in a compound.
In chemistry, a compound's percent composition is calculated by dividing its total amount of each elements by the compound's total amount, multiplied by 100. The following formula determines an element's percentage composition:
(gE/gT) = %CE 100
Here, %CE stands for the element's composition in percent.
How to calculate the percentage of each element by mass makes up each compound?
To get the mass percent of an element in a compound, multiply the result by 100 after dividing the mass of the element in 1 mole of the compound by the compound's molar mass.
Calculating total mass of HNO3
= 1 x 1 + 14 x 1 + 16 x 3
= 1 + 14 + 48
= 63
Calculating the mass percentage of Nitrogen in HNO3
= 1/63 x 100
= 1.586 %
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Depression in freezing point of non-electrolyte solution containing 29.5 g of a substance in 100 g of water is 1.6 K. Determine the molar weight of the substance. (Cryometry).
The depression in freezing point of the electrolyte is 1.6 K. The weight of the solute added is 29.5 g. Then the molar mass of the compound is obtained to be 342.93 g/mol.
What is depression in freezing point?Addition of a non-volatile solute into a solvent decreases the freezing point of the solution. The depression in freezing point is calculated as follows:
ΔT = W₂ 1000 Kf / (M W₁)
where W₂ be the mass of solute and W₁ is that of solvent, Kf is called molal depression constant. M be the molar mass of the solute.
Given ΔT = 1.6 K
W₂ = 29.5 g
W₁ = 100 g
Kf of water = 1.86 K/m
Then M = W₂ 1000 Kf / ( ΔT W₁)
M = 29.5 g× 1000 × 1.86 / (1.6 K × 100 g) = 342.9 g/mol
Thus, the molar mass of the solute is 342.9 g/mol.
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EXPLAIN Before medical images are taken, radioisotopes are often injected into a vein in a patient’s arm, or the patient drinks a solution containing the radioisotopes. Why do
you think atoms in the body usually do not emit radiation?
Answer: adioisotopes, are species of chemical elements that are produced through the natural decay of atoms. Exposure to radiation generally is considered harmful to the human body, but radioisotopes are highly valuable in medicine, particularly in the diagnosis and treatment of disease.
Explanation:
Which electron configuration represents a transition element?
01s²2s²2p³
01522s22p635²
1s²2s²2p63s²3p64s²3d7
1s22s22p63s23p64s²3d¹04p4
The electronic configuration which represents a transition element is 1s²2s²2p⁶3s²3p⁶4s²3d⁷
What is a transition element?Transition elements are placed between the metallic S-block elements and nonmetallic P-block elements in the periodic table. They are D-block elements and have features similar to both metals and nonmetals, to some extent. This is why they are called transition elements.
One remarkable feature of these elements happens during the addition of electrons to them. Contrary to S and P-block elements, electrons are added to the penultimate shell, not the last shell. These elements often feature partially filled d-orbitals and have multiple oxidation states.
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How to solve this problem in Chemistry? I am stuck
The buffer can be made using an acid or a base.
What is a buffer?We have to know that the term buffer is the generic term that can be generally used to describe any solution that is resistant to changes in acidity and the alkalinity of the solution.
We know that we can be able to make a buffer in two ways;
1) By the use of a weak acid and its salt
2) By the use of weak base and its salt.
In each case, the pH of the solution that has been formed would not be easily changed and this is the job of the buffer.
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Hydrogen gas is produced when we
metal with hydrochloric acid:
react magnesium
Mg(s) + 2 HCI(aq) - MgCl(aq) + H2(g) 7z
(a) If 4.50 g of hydrogen gas is collected at STP, what
volume of hydrogen does
this represent?
(b) If 0.52 mol of magnesium completely reacted, what
amount of hydrogen gas (in moles) would be produced
at STP? How many grams of hydrogen iS this?
Magnesium is a metal that reacts quickly. The reaction with hydrochloric acid will result in the production of magnesium chloride and hydrogen gas.
How much hydrogen is generated by the reaction at STP?Molecules, pressure, and temperature were necessary to determine the gas's volume. We only need to determine the moles of hydrogen because temperature and pressure have already been provided. As a result, 16.8 L of hydrogen were created at STP by dissolving 13.5 g of aluminum in sulfuric acid.
How much hydrochloric acid must be present for 0.50 mol of magnesium to react?The chemistry is described below. According to the aforementioned reaction, 1 mole of magnesium and 2 moles of HCl are involved. The HCl moles are therefore 20.50mol=1mol 2 0.50 m o.
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I understand how a change in the size of the moon jellies' resource population can change the number of births in the moon jelly population.
Responses
Explain your answer choice.
A change in the size of the moon jellies' resource population can change the number of births in the moon jelly population because the big size of the resources can produce more births.
How do moon jellies reproduce?When there is more energy storage molecules present in the moon jellies, they can reproduce more, in more births. Fewer deaths would also lead to the jelly population increasing. The sea turtle population, and the moon jellies consumer population is also decreased.
There must be a change to the birth rate or the death rate in the moon jelly population. Within a population, organisms are born and dying continuously. If the number of births and deaths in a given time interval are equal, then the population size will remain stable.
So we can conclude that a large population of resources will lead to more births.
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Charged Particles
Charge on Particle Number of Particles
Positive 3
Negative 2
A negatively charged substance is brought near the ion. What will most likely happen?
(A) The negatively charged ion will repel the substance.
(B) The negatively charged ion will attract the substance.
(C) The positively charged ion will repel the substance.
(D) The positively charged ion will attract the substance.
Answer:
D
Explanation:
cause overall charge is +1 so will attract
The density of oxygen gas at a certain temperature and pressure is 1.345 g cm-3. How many oxygen atoms are present in 2.0 L of oxygen gas at this same temperature and pressure?
The number of oxygen atoms present in 2.0L of oxygen gas at same temperature and pressure is 5.1 × 10²² atoms.
How to calculate number of atoms?The number of atoms of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number (6.02 × 10²³).
no of atoms = no of moles × 6.02 × 10²³
According to this question, the density of oxygen gas at a certain temperature and pressure is 1.345 g cm-³. If 2.0 L of oxygen gas is given, the mass of the oxygen gas can be calculated as follows:
mass = 1.345 × 2 = 2.69grams
moles = 2.69g ÷ 32g/mol = 0.084moles
No of atoms = 0.084 mol × 6.02 × 10²³
no of atoms = 5.1 × 10²² atoms
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What is the formula for calculating kinetic energy?
KE= 1/2mv²
KE=2mv²
KE=1/2m²v
KE=2m²v
Answer:
The formula for kinetic energy is KE= 1/2mv²
Explanation:
Hope it helps you
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