Answer:
element: Beryllium
protons are: positive
electrons are: negative
charge on this atom: 2+
Explanation:
What makes up
matter? Use the definition of atomic theory to answer.
Answer:
Atoms make up every form of matter, according to the atomic theory.
Explanation:
Hope this helps!
Calculate the mass of acetone, C3H6O, that vaporizes as a result of absorbing 500 KJ of energy. The molar enthalpy of vaporization of acetone is 31.3 Kj/mol
The organic molecule acetone has the chemical formula (CH3)2CO. The smallest and most basic ketone. It is a colorless, incredibly combustible liquid with a distinctively strong smell. Because it is miscible with water, acetone is used as a significant organic solvent in industry, the household, and laboratories.
Calculate the mass of acetone, C3H6O, that vaporizes as a result of absorbing 500 KJ of energy.
Knowing that;
acetone weighs 31.5 g.
Acetone's molar mass is 58.08 g/mol.
Acetone has a heat of vaporization of 31.3 kJ/mol.
Count of moles = mass / molar mass
Acetone molecular weight = 31.5 / 580.8
Acetone has a molecular weight of 0.5424 moles.
By dividing the number of moles of acetone by the heat of vaporization of acetone, one may calculate the amount of heat necessary to evaporate 31.5 g of acetone;
Hence;
31.3 g of acetone must be heated to vaporization temperature of 31.0 kJ/mol, or 0.5424 mole.
16.8144 kJ of heat are needed to evaporate 31.3 g of acetone.
≅ 16.81 kJ
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you've purchased a 12 ounce can of frozen orange juice concentrate at kroger. the instructions tell you to mix the contents of the can (the frozen oj) with 36 ounces of water (roughly 3 cans of water). name the solvent in this scenario
The solvent is water.
What are solutes and solvents and how do you differentiate them?
Solute-
A solute is a material that can be broken down by a solvent to form a solution. There are numerous ways a solute can exist. It could be a solid, liquid, or gas. The solute is broken up and distributed among its molecules evenly by the solvent, or substance, which causes the solute to dissolve.
Solvent-
Solvents are substances that cause solutes to dissolve and form solutions. Although it can also be a solid, a gas, or a supercritical fluid, we always find solvent as a liquid.
Given that 12 ounces of frozen orange juice is mixed with 30 ounces of water (roughly 3 cans of water), to understand this we can simply write
If 36 = 3
12 = ?
12×3 = 36×OJ
OJ = 1
,i.e, orange juice has one can and water has three cans.
1:3
Simply, orange juice is soluble in water because the solvent in this scenario is water. Due to its polarity and ability to form hydrogen bonds, water makes an excellent solvent, meaning that it can dissolve many different kinds of molecules.
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List 10 elements used in a tesla vehicle
The elements used in a tesla are given below.
What is an element?
A chemical element is a type of atom with a certain number of protons in its nucleus, including the pure material made up entirely of that species. Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical process. The number of protons in an element's nucleus is its defining attribute and is referred to as its atomic number.
Aluminum, Copper, Titanium, Nickel, Cobalt, Manganese, Lithium, Iron, Phosphorus, Boron are the elements used in tesla vehicle.
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Which is the first step that geologists must do to compare rock layers at distant locations?
find the absolute age of rocks at both locations
e compare a layer at one location to layers at other locations
O identify index fossils In one or more layers at one location
collect fossils from different locations to study the organisms' lifestyles
The first step that geologists must do to compare rock layers at distant locations is identify index fossils In one or more layers at one location.
The remains of ancient organisms, such as plants and animals, that were preserved from the prehistoric era by the influence of natural conditions are known as fossils.Any plant or animal that has been preserved in the Earth's rock record and is specific to a certain geologic period or environment is an index fossil.The correlation of strata and the establishment of time scale boundaries in geology are both based on index fossils.A suitable index fossil needs to be unique or easily identifiable, plentiful, have a broad geographic distribution, and have a limited time range.Index fossils are regarded as often discovered, widely dispersed, and disseminated fossils that are scarce in the time period.Learn more about fossils here:
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Describe How are
the two forms of energy
carried by waves and matter related?
the energy of matter implies the movement of masses, and wave energy has no moving masses
The energy of particles (matter) is the ability to do some work, so the energy can be movement in the form of kinetic energy or in the configuration of a system called potential energy, the sum of these two energies is constant.
A wave is formed as a result of perturbation of the medium by a substance, therefore, for the formation of a wave, a substance supplies energy, for example: in the form of motion, in the form of an electric or magnetic field oscillation, etc.
Waves after formation can move away from the substance that formed them, transferring energy that alternately has kinetic and potential energy, but the total energy is constant.
Therefore, the energy in matter is caused by the movement of the same, and the energy in the wave does not require the movement of matter, so this is a more efficient way of doing the work.
In conclusion, the energy of matter implies the movement of masses, and wave energy has no moving masses.
Here is the structure of 4-pyrone, an aromatic compound. Add curved arrows to convert the structure to a new resonance contributor where all atoms still satisfy the octet rule. Draw the new contributor in the box to the right, including all lone pairs and nonzero formal charges. Your new resonance contributor should reflect the aromaticity of the compound
The second resonance contributor demonstrates the aromaticity of the compound by maintaining the six-membered ring with 6 (4n+2) pi electrons.
The easiest way to draw another resonance structure is to move an pi-electron pair and then repeat that process. After three shifts, the resulting structure does have separated charges, with a positive charge on one of the oxygen atoms (which is not too favorable, considering the oxygen's high electronegativity), but all the non-hydrogen atoms still have a full octet and the presence of the aromatic ring does greatly stabilize the structure. It also explains why the compound (resonance hybrid) is aromatic.
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percent error: a balance measured the mass of 1.0000g & its standard measurement is 0.9981g
The percentage error of the balance is 0.19%
Formula for percentage errorPercentage error = (absolute error / standard measurement) × 100
How to determine the percentage errorThe pecenrage error of the balance can be obtained as illustrated below:
Measured value = 1.0000 gStandard measurement = 0.9981 gAbsolute error = 1 - 0.9981 = 0.0019 gPercentrage error =?Percentage error = (absolute error / standard measurement) × 100
Percentage error = (0.0019 / 0.9981) × 100
Percentage error = 0.19%
Thus, the perecentage error of the balance is 0.19%
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A gas mixture being used to simulate the atmosphere of another planet at 23°c consists of 337 mg of methane, 148 mg of argon, and 210 mg of nitrogen. The partial pressure of nitrogen at 296 k is 19. 0 kpa. Calculate the total pressure of the mixture.
A gas mix consist of methane, argon , nitrogen, the total pressure of gas mixture is 81.89 kpa.
According to the Dalton's law of partial pressure.
The partial pressure of gas = the mole fraction of gas × total pressure.
Total pressure of gas = some of the partial of all the constituent gases.
no. of mole = mass of substance / mass of one mole
now,
The no. of moles of methane = ( 337 mg × 1 g ) / ( 1000 mg × 16 g/mol)
= 0.0210 g/mols
The no. of moles of argon = (148 / 1000 )g / 40 g/mol
= 0.0037 mols
The no. of moles of nitrogen = (210 / 1000 g) / 28 g/mol
= 0.0075 g/mols
The total no. of moles = 0.0210 + 0.0037 + 0.0075
= 0.0322 mols
The mole fraction of nitrogen = 19.0 kpa
therefore ,
The total pressure = partial pressure of a gas / mole fraction of the gas
= 19.0 kpa / 0.0322
= 81.89 kpa
Thus,A gas mix consist of methane, argon , nitrogen, the total pressure of gas mixture is 81.89 kpa.
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an element has four naturally occurring isotopes with the masses and natural abundances given here. isotope mass (amu) abundance (%) 1 203.97304 1.390 2 205.97447 24.11 3 206.97590 22.09 4 207.97665 52.41
The average atomic mass of istopes is 207.217126723 amu
Isotopes are members of family of an electron having same no. of protons but different no. of neutrons.
For the average atomic mass we have to multiply the masses to the abundance % of isotopes and then add all the mass.
1) 2.203.97304 amu has an abundance % of 1.390
= 203.97304 × 1.390
= 283.5225256/100 amu
2) 205.97447 amu has an abundance % of 24.11
= 205.97447 × 24.11
= 4966.0444717 /100 amu
3) 206.97590 amu has an abundance of % 22.09
= 206.97590 ×22.09
= 4572.097631 /100 amu
4) 207.9765 amu has an abundance of % 52.41
= 207.9765 × 52.41
= 10900.048365 /100 amu
now, the average atomic mass is
= (283.5225256 + 4966.0444717 + 4572.09731+10900.048365)/100 amu
= 207.217126723 amu
Therefore, The average atomic mass of isotopes is 207.217126723 amu
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Two type of chemical compounds
Answer:
molecular (covalent) and ionic
Explanation:
The elements magnesium (Mg) and calcium (Ca) play vital roles in maintaining human health, including processes like bone building. The majority of Americans have lower levels of magnesium than health experts recommend. Do some research in order to propose a possible hypothesis that could explain this phenomenon.
Hint: Consider diet and lifestyle when conducting your research.
Furthering the Discussion
If you need more material to continue the conversation, use these questions as a guide.
What are some possible health issues a person with a magnesium deficiency could experience?
What are some ways that people can be sure to take in enough magnesium and calcium to ensure their good health?
The possible health issues a person with a magnesium deficiency could experience is osteoporosis and high blood pressure.
What is Magnesium?this is referred to as chemical element with atomic number of 12 and the sign is Mg.It is very important in the body as it helps in the proper functioning of the musculoskeletal system and also aids energy production in body cells.
A deficiency in this will result in osteoporosis and ways that people can be sure to take in enough magnesium and calcium to ensure their good health is by eating food which are rich in them such as vegetables, fruits etc.
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Calculate the displacement of an object that traveled 4m east, turned 90 degrees, and traveled 5m north.
The displacement of an object that traveled 4m east , turned 90 degress and traveled 5m north is 6.40 m
Displacement of an object is defined as the change in position of the object. displacement is the vector quantity , which means it has magnitude as well as direction.
In the give case an object first traveled east 4m and then turn 90 degree an traveled 5m north , so, it makes a right angled triangle .
by applying Pythagoras's theorem to the triangle we get
displacement = [tex]\sqrt{(4m)^{2} + (5m)^{2} }[/tex]
= [tex]\sqrt{16 + 25}[/tex] m
= [tex]\sqrt{41}[/tex] m
= 6.40 m
Thus,The displacement of an object that traveled 4m east , turned 90 degress and traveled 5m north is 6.40 m.
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Which statement describes renewable resources?
O Fossil fuels are a type of renewable resource.
O Renewable resources are artificial.
Renewable resources replenish quickly.
O Large quantities of renewable resources can be produced at once.
A natural resource that will replenish to replace the portion used up by usage and consumption, commonly referred to as a flow resource, will do so through natural reproduction or other cyclical processes in a limited length of time on a human time scale.
Which statement describes renewable resources?
"Renewable resources replenish quickly."
Resources that can replace themselves over time as they are utilised or that can last indefinitely are considered renewable resources. They consist of biomass, the sun, wind, water, and geothermal energy. Renewable resources have the drawback of not always being accessible when needed.
Biomass energy (such as ethanol), hydropower, geothermal energy, wind energy, and solar energy are examples of renewable resources.
Finding the best way to use renewable resources is a task that is becoming more and more crucial as the Earth's nonrenewable resource supply is depleted. In addition to better sustaining the world's quickly expanding population, switching to renewable energy will also leave the environment greener and healthier for future generations.
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Answer: C
Explanation: I took the quiz
I do not understand what they mean by a smooth line graph
A smooth line graph is use to draw a general pattern curve rather than just connect the points.
We use to draw a smooth line graph because smooth line reflects a general pattern and we can determine the general behavior of data points to be plotted. When we just connect the dots we are unable to find the equation because of broken line. when draw a graph we have to find out the line that could fit all the points and make a smooth pattern, smooth line curve is very helpful for the calculations.
Thus, A smooth line graph is use to draw a general pattern curve rather than just connect the points.
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O Why is it called a "mass" number?
Calculate the maximum wavelength of light capable of dissociating the br–br bond in one molecule of bromine if the bond energy, or bond dissociation energy, is 194 kj/mol.
According to bond energy, the maximum wavelength of light is 614 nanometers.
We need to know about bond energy to solve this problem. Bond energy is the energy needed to bond other atoms in the molecule. To determine the energy in one molecule of chlorine monofluoride, we can use this formula:
E = BE / Na
where E is the energy of photon, BE is bond energy and Na is Avogadro's number (6.02 x 10²³ atoms/mol)
Now, we can calculate the shortest wavelength by using Einstein's equation for photon energy:
E = h . c / λ
where h is Planck constant (6.6 x 10¯³⁴ J.s), c is the speed of light (3 x 10⁸ m/s) and λ is the wavelength.
From the question above, we know that
BE = 194 kJ/mol = 194 x 10³ J/mol
By substituting the given parameters, we can calculate the maximum wavelength
E = BE / Na
h . c / λ = 194 x 10³ / 6.02 x 10²³
6.6 x 10¯³⁴ . 3 x 10⁸ / λ = 194 x 10³ / 6.02 x 10²³
λ = 6.14 x 10¯⁷ m
λ = 614 nm
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How much anhydrous magnesium sulfate is required to dry a diethyl ether solution after preforming extractions involving water?.
The anhydrous magnesium sulfate required to dry a di-ethyl ether solution after performing extractions involving water is enough such that some powder remains free flowing in solution with swirling without clumping.
Extraction is a process which involves transfer of a solute from one phase to another. A cup of tea or coffee prepared represents a process of extraction.The flavor and odor components are extracted from the dried material into the water.
Anhydrous magnesium sulphate works as a drying agent. Magnesium sulfate (MgSO₄) works by forming complex with H₂O in the solvent. It forms a hydrated MgSO₄ precipitate. This precipitate is then filtered out by gravity, which yields an anhydrous product. Due to the high affinity towards water molecules, MgSO₄ removes any amount of water from the extracts.
Due to the presence of an active hydrogen atom, ethyl alcohol reacts with magnesium metal. Diethyl ether, does not have any replaceable hydrogen atom. So, it does not react with magnesium sulfate, therefore, can be dried by anhydrous magnesium sulfate.
Complete question is -
How much anhydrous magnesium sulfate is required to dry a diethyl ether solution after preforming extractions involving water?
Select answer and submit.
a. Enough to cover the tip of your scoopula once
b. 1 g/mL of diethyl ether
c. Enough such that some powder remains free flowing in solution with
swirling without clumping
d. Anhydrous magnesium sulfate doesn't dry diethyl ether
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TRUE OR FALSE
In the space provided, write "true" if the sentence is true. Write "false" if the sentence
1. Straining causes a chemical change.
2. Evaporation causes a chemical change.
3. A magnet causes a physical change.
4. Dissolving causes a physical change.
5. Filter paper has large holes.
6. Only scientists use strainers.
7. When a liquid evaporates, its molecules go into the air.
8. Sugar dissolved in water is still sugar.
9. A magnet can separate a mixture of paper clips and rubber
10. Hot water evaporates faster than cold water.
FILL IN THE BLANK
Complete each statement using a term or terms from the list below. Write your answers in
spaces provided. Some words may be used more than once.
mixture
air
dissolving
evaporation
heated
straining
dissolve
filter paper
1. Four ways to separate mixtures are
and
2. Straining separates matter according to.
3. A
separates matter by size.
iron
using a magnet
strainer
holes
4. A strainer has many
5. We can separate a mixture of very tiny solid pieces and water by using
gre a
from a mixture.
6. We use a magnet to separate.
7. When water evaporates, the vapor escapes into the
8. A solid that seems to disappear in a liquid is said to
Answer:
1. F) 2. F) 3. T) 4. T) 5. F) 6. F) 7. T) 8.F) 9.T) 10. T)
Explanation:
Not available.
Gas stored in a tank at 273 K has a pressure of 388 kPa. The safe limit for pressure is 825 kPa. At what temperature will the gas reach this pressure?
580.47 Kelvin
Gas stored in a tank at 273 K has a pressure of 388 kPa. The safe limit for pressure is 825 kPa.
temperature will the gas reach this pressure =
as per above statement, we have got
p1 = 388 kPa P2 = 825 kPa
T1 = 273 K T2 =
as per ideal gas equation PV = nRT
since n, V , R is constant , so we ignore them,
now equation will become
P1/T1 = P2T2
now putting the values
388/273 = 825/T2
T2 = 825 * 273 ÷ 388
T2 = 224,225/388
T2 = 580.47 Kelvin
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does hydrogen-1 have more protons than hydrogen-2?
Your question: does hydrogen-1 have more protons than hydrogen-2?
Your Answer: no, they both have an equal amount, with one protons.
__________________________________________________________
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Answer the next five questions based on the diagram:
How many electrons are in the n = 1 shell?
4 , 14 , 6 , 5 , 2 , 3
How many electrons are in the n = 2 shell?
4 , 14 , 6 , 5 , 2 , 3
How many electrons are needed to complete the n = 2 shell?
4 , 14 , 6 , 5 , 2 , 3
How many electrons are being shared between the two nitrogen atoms?
4 , 14 , 6 , 5 , 2 , 3
How many bonds exist between the two nitrogen atoms?
4 , 14 , 6 , 5 , 2 , 3
There are 2 electrons in the n = 1 shell.
There are 5 electrons in the n = 2 shell.
The number of electrons which are needed to complete the n = 2 shell is 3.
The number of electrons which are being shared between the two nitrogen atoms is 3
There are 3 covalent bonds which exist between two nitrogen atom.
What is an an element?It is chemical substance which do take part in a reaction.
So therefore, there are 2 electrons in the n = 1 shell.
There are 5 electrons in the n = 2 shell.The number of electrons which are needed to complete the n = 2 shell is 3.The number of electrons which are being shared between the two nitrogen atoms is 3There are 3 bonds which exist between two nitrogen atom.Learn more about elements:
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The mass ratio of sodium to fluorine in sodium fluoride is 1:2:1. A sample of sodium fluoride produced 28.8g of sodium upon decomposition. How much fluorine (in grams) was formed?.
Answer:
57.6g
Explanation:
1u=28.8g
2u=28.8g×2
.....=57.6g
How do you find the number of neutrons for any atom?
An experiment
requires 15.0 g of cyclohexane, whose density at 25 °C is
0.7781 g/mL. What volume of cyclohexane should be used?
The correct answer is 19.28 L .
Simply put, the volume is calculated using the mathematical relationship between the entire mass that is available and the chemical substance's density. The following equation illustrates how to calculate a chemical substance's volume:
Volume = Total mass / Density
The density is calculated using the following formula: ρ= m/V, where m is the object's mass and V is its volume.
The temperature is T = 25∘C
the mass of the cyclohexane is m_c = 15 g ,
and the cyclohexane's density is ρ = 0.7781 g/L
The volume of cyclohexane is computed using the relation shown below:
m = ρ × V
V = m / ρ
V = 15g/0.7781
V = 19.28 L
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Compare the metals calcium and magnesium, which metal would be stronger?
Why is it important for scientists to publish a
description of their procedures along with the results
of their experiments?
Answer:
Anything related to science needs to be detailed and understood by a range of people. Or, what they published may not create any impact if you can't read it and understand what you just read.
Explanation:
What additional information, if any, would enable you to calculate the molality of a 7. 35 molar solution of a nonelectrolyte solid dissolved in water?.
The molality of the solvent is 13.8966 m
It would be necessary to know both the solution's density and the
solute's molecular weight.
Explanation:
Molarity = [tex]\frac{mole solute}{L solution}[/tex]
Molality = [tex]\frac{Mole solute }{kg solvent}[/tex]
The solution's density can be used to convert 1 L of the solution's volume into a mass solution. then the substance's molecular weight solute (given or calculated from the formula) can be utilized to change the number of moles mass of the solute in a 1 L solution using grams. The solvent's mass is the difference between the solution's mass and as well as the solute's mass (both of which have been determined). Replace the values and compute using the molality formula.
so the total mass of the solution is 934.4 g,
which leaves 934.4 g − 178.82 g = 755.58 g of
water.
Therefore, the molality is
m = [tex]\frac{10.5 mol NH3}{0.75558 kg solvent}[/tex] = 13.8966 m .
The molality of the nonelectrolyte solid is 13.8966 m.
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The molality of the solvent is 13.8966 m.
How to calculate molality?Molality = Moles of solute / Kilograms of solvent.
Its unit is mol/kg.
The total mass of the solution = 934.4 g,
which leaves 934.4 g − 178.82 g = 755.58 g
m = 10.5molNH3/0.75558Kg of solvent
m = 13.8966 m .
The molality of the non-electrolyte solid is 13.8966 m.
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How many atoms does Cr3(PO4)2 have
Answer: 5
Explanation:
Cr3 has 3 atoms
(PO4)2 has 2 atoms
2 + 3 = 5 atoms
If you could place 100 billion atoms in 1 m3 box, how many atoms are there in a 10 cm3 box? (6)
There are 100 billion atoms in a 1 m3 box. There will be ( 10 ^ 8 ) billion atoms in a 10 cm 3 box.
Atoms:
Atoms are the smallest particle of the atom. There are 100 billion atoms in a 1 m 3 box.
1 m= 100 cm
1 m 3= (100) 3 cm3
= 1000000 cm^ 3.
1 m3 = 100 billion atoms.
1 cm 3= x
x= 100 billion * 1000000 cm3
= 100000000 billion atoms.
= ( 10 ^ 8 ) billion atoms.
Therefore, There will be ( 10 ^ 8 ) billion atoms in a 10 cm 3 box.
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