In this model, electrons are found on unique levels and when jumping from one level to another, electrons emit light at a specific wavelength.
What is the Bohr model?The Bohr model is an atomic model describing the properties of atoms and their constituents (electrons).
This model states different atoms have specific levels of energy where electrons can be located.
In conclusion, in this model, electrons are found on unique levels and when jumping from one level to another, electrons emit light at a specific wavelength.
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Answer:
In the Bohr model, electrons can exist only in certain energy levels surrounding the atom. The energy levels in each atom are unique. When electrons jump from a higher energy level to a lower one, they emit light at a wavelength that corresponds to the energy difference between the levels.
Explanation:
Ed22
Determine the molar mass of a 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm. group of answer choices 1.954 g/mol 73.6 g/mol 7.18 g/mol 9.17 g/mol
Considering the ideal gas law and the definition of molar mass, the molar mass of the sample of gas is 9.17 [tex]\frac{g}{mol}[/tex].
Ideal gas lawAn ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances.n is the number of moles of the gas. Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Molar mass of the sample of gasIn this case you know:
P= 0.980 armV= 1.20 LT= 287 KR= 0.082 [tex]\frac{atmL}{molK}[/tex]n= ?Replacing in the ideal gas law:
0.980 atm× 1.20 L= n× 0.082[tex]\frac{atmL}{molK}[/tex]× 287 K
Solving:
(0.980 atm× 1.20 L)÷ (0.082[tex]\frac{atmL}{molK}[/tex]× 287 K)= n
0.04997 moles= n
On the other hand, you know that the mass of the sample of gas is 0.458 grams. Replacing in the definition of molar mass:
[tex]molar mass=\frac{0.458 grams}{0.04997 moles}[/tex]
Solving:
molar mass= 9.17 [tex]\frac{g}{mol}[/tex]
Finally, the molar mass of the sample of gas is 9.17 [tex]\frac{g}{mol}[/tex].
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A reaction proceeds with 2.72 moles of magnesium chlorate and 3.14 moles of sodium hydroxide. this is the equation of the reaction: mg(clo3)2 2naoh → mg(oh)2 2naclo3. determine the theoretical amount of each product that the reaction will produce. the reaction will produce of magnesium hydroxide and of sodium chlorate.
The theoretical amount of each product obtained are:
1.57 moles of Mg(OH)₂3.14 moles of NaClO₃Balanced equationMg(ClO₃)₂ + 2NaOH —> Mg(OH)₂ + 2NaClO₃
How to determine the limiting reactantFrom the balanced equation above,
1 mole of Mg(ClO₃)₂ reacted with 2 moles of NaOH
Therefore,
2.72 moles of Mg(ClO₃)₂ will react with = 2.72 × 2 = 5.44 moles of NaOH
From the calculation above, we can see that a higher amount (5.44 moles) of NaOH than what was given (3.14 moles) is needed to react completely with 2.72 moles of Mg(ClO₃)₂
Therefore, NaOH is the limiting reactant
How to determine the theoretical yield of Mg(OH)₂From the balanced equation above,
2 moles of NaOH reacted to produce 1 mole of Mg(OH)₂
Therefore,
3.14 moles of NaOH will react to produce = 3.14 / 2 = 1.57 moles of Mg(OH)₂
Thus, the theoretical yield of Mg(OH)₂ is 1.57 moles
How to determine the theoretical yield of NaClO₃From the balanced equation above,
2 moles of NaOH reacted to produce 2 mole of NaClO₃
Therefore,
3.14 moles of NaOH will also react to produce 3.14 moles of NaClO₃
Thus, the theoretical yield of NaClO₃ is 3.14 moles
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Kira dissolved different solutes in 100 ml of water. She recorded the amount of each solute that would dissolve at different temperatures. What information will this investigation confirm?.
An element A combines with element B. The electrons are transferred from the atom A to the atom B. .
(a) What is the nature of bond between A and B?
(b) What are the two main properties expected compound AB?
(c) What happens if this compound is dissolved in water? To
(a) The nature of bond between A and B is an ionic bond.
(b) The two main properties of the ionic compounds are:
Ionic Compounds have high boiling and melting points as they're very strong and require a lot of energy to break.The electrostatic forces of attraction between oppositely charged ions lead to the formation of ions.(c) If the ionic compound is dissolved in water, the ions in the solid separate and disperse uniformly
What is an ionic compound?Ionic compounds contain ions and are held together by the attractive forces among the oppositely charged ions.
An ionic bond is formed by the complete transfer of some electrons from one atom to another. The atom losing one or more electrons becomes a cation—a positively charged ion.
In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution.
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Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
3.96 * 0.1159 = [?]
The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)
Meaning of Significant figures and the rule of engagementSignificant figures can be defined as numbers in a group of numbers that place number in the right value or worth.
Significant figures defined the value of measurement of a particular number.
The rules of engagement in this case is the set of rules or laid down principles that direct how we interact with this significant figures and how they are used.
For this case the significant figures of the product will be the same as the figure with the least significant figure in the multiplication.
In conclusion, The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)
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How many cells are in bacteria? (any links added will be reported!)
Answer:
There is 1 cell in bacteria and it is called Prokaryotic cells
Explanation:
Please hurry! classify the following as a
heterogeneous mixture,
homogeneous mixture (solution), or
a pure substance:
s'mores
a. heterogeneous mixture
b. homogeneous mixture/solution
c. pure substance
Answer:it’s A
Explanation:
Smores are made up of different materials are made by squashing a hot, oozing marshmallow with chocolate between two Graham crackers. This is heterogeneous mixture.
What are S’mores?A dessert consisting usually of toasted marshmallow and pieces of chocolate bar sandwiched between two graham crackers. Graham crackers, marshmallows, and chocolate are used to make s'mores. Homogenous mixture: A homogeneous mixture is a mixture of substances blended so thoroughly that you cannot see individual substances. Example- A mixture of salt and water, A mixture of water and sugar.
Heterogeneous mixture: A heterogeneous mixture is a mixture of two or more compounds. Example- Vegetable soup is a heterogeneous mixture. Any given spoonful of soup will contain varying amounts of the different vegetables.
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Which statement defines specific heat capacity for a given sample
The statement that defines the specific heat capacity for a given sample is the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure.
What is specific heat capacity?Specific heat capacity is the of heat to increase the temperature per unit mass.
The formula to calculate the specific heat is Q = mct.
The options are attached here:
The temperature of a given sample is 1 %.The temperature that a given sample can withstand.The quantity of heat that is required to raise the sample's temperature by 1 °C1 °C (Kelvin).The quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure.Thus, the correct option is 4. The quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure.
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Including soluble fiber into your diet can __________.
A. digest amino acids
B. digest cellulose
C. raise cholesterol levels
D. lower cholesterol levels
Answer:
The answer is D.
Explanation:
Including soluble fiber into your diet can lower cholesterol levels.
A piece of copper wire is 180 cm long. how long is the wire in millimeters? how many
40 mm segments of wire can be cut from the length
Centimeters and millimeters are both interconvertible units to measure length. The conversion factor is as follows:
1 centimetre = 10 millimetres
This means that if a copper wire is 180cm long, the wire would be;
180 × 10 = 1800mm long
Also, the number of 40 mm segments of wire that can be cut from the length is calculated as follows:
1800mm/40mm = 45
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how do gases exert pressure into a cylindrical container
Answer: The molecules are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces. The more particles that hit the walls, the higher the pressure. If a gas is heated up, its particles move around more quickly. They hit the walls of their container harder and more often. This increases the pressure. Sometimes the pressure gets so great that the container bursts.
Explanation:
Answer:
When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces.
Explanation:
The molecules are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces. The more particles that hit the walls, the higher the pressure.
20 examples of normal salt
Which of the following numbers is equal to the value shown in scientific
notation below?
1.9 x 10-2
A.0.0019
B.0.019
C.0.19
D. 0.00019
Explanation:
the answer for the above
is b)0.019
Which information must be known about a compound to find the molecular formula from the empirical formula?
The molecular mass of the compound is required to calculate the molecular formula from the empirical formula.
What is a molecular formula?A chemical formula that gives the total number of atoms of each element in each molecule of a substance.
Dividing the molar mass of the compound by the empirical formula mass. The result should be a whole number or very close to a whole number. Multiplying all the subscripts in the empirical formula by the whole number will give the resultant molecular formula.
Hence, the molecular mass of the compound is required to calculate the molecular formula from the empirical formula.
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What is true about the breakdown of starch?
a.
Animals, but not plants, can break down starch.
b.
Organisms break down starch into carbon, hydrogen, and oxygen atoms.
C. Organisms break down starch into carbohydrate subunits.
d.
Starch breakdown is not a chemical reaction
Answer:
Option C
Explanation:
Organisms break down starch into glucose
Which is a carbohydrate subunitThe organisms are found in our digestive system helps in break down of starch and turns them into glucoseAnswer:
Organisms break down starch into carbohydrate subunits.
Explanation:
Starch is a necessary amount of our bodyIt is used as an carbohydrate subunit well known as glucoseIt is converted through organismsSo option C is correct
Select the correct answer. the compound diborane can be used as a rocket propellant. what is the percent composition of boron in diborane (b2h6)? a. 22% b. 25% c. 39% d. 75% e. 78%
The percent composition of boron in diborane (b2h6) is 78% because the mass of boron is higher than hydrogen atom.
What is diborane?Diborane is a poisonous, reactive gas that is produced by the action of acids on borides. Diborane is used as a reducing agent for making other chemicals and also act as a catalyst.
So we can conclude that The percent composition of boron in diborane (b2h6) is 78% because the mass of boron is higher than hydrogen atom.
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The compound diborane can be used as a rocket propellant. the percentage composition of boron in diborane (B2H6) is 75%. Option D. This is further explained below.
What is the compound diborane?Generally, Diborane is simply defined as a compound having the molecular formula B2H6, Diborane is more often known as diborane.
In conclusion, As a rocket fuel, diborane is a useful chemical. Diborane (B2H6) contains 75 percent boron by weight.
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NEED HELP!!!
How many moles of magnesium is 3.01 x 1022 atoms of calcium?
preferably a step by step answer....thank u<3
Answer:
0.03 mol
Explanation:
The equation relating the number of moles and number of atoms is:
Number of atoms = number of moles × 6.02 × 10²³
[6.02 × 10²³ is the Avogadro's constant and is the number of particles in 1 mole of any substance.]
By rearranging the equation, we can find the number of moles of calcium.
Number of moles = (3.01 × 10²²) ÷ (6.02 × 10²³)
Number of moles = 0.05 moles of calcium
Now the only data we know about these two elements are their Mr values, so we are going to find the number of moles of magnesium using ratio.
Moles : Mr
0.05 mol : 40.1
x : 24.3
[we are going to assume that x is the number of moles of magnesium that we have to find out.]
Cross multiply the ratios.
40.1x = 0.05 × 24.3
x = 1.215 ÷ 40.1 = 0.03 mol
How many moles of naoh will react with 13.5 moles of k3po4
Answer: 40.5 mol
Explanation:
Since this is a double replacement reaction, the unbalanced equation is something like follows:
[tex]\text{K}_{3}\text{PO}_{4}+\text{NaOH} \longrightarrow \text{KOH}+\text{Na}_{3}\text{PO}_{4}[/tex]
Balancing this equation,
[tex]\text{K}_{3}\text{PO}_{4}+3\text{NaOH} \longrightarrow 3\text{KOH}+\text{Na}_{3}\text{PO}_{4}[/tex]
From this equation, we can conclude that for every 3 moles of sodium hydroxide consumed, 1 mole of potassium phosphate is consumed.
This means the answer is 13.5(3)=40.5 mol
What health benefits can you get from consuming fiber? (select all that apply.)
soluble fiber can be absorbed into your skin to increase skin cells.
fiber helps digestion and can prevent constipation.
fiber can help create red blood cells.
soluble fiber helps lower cholesterol, which may prevent heart disease.
Answer:
Above all are correct answer.
some other benefits are like, Dietary fiber increases the weight and size of your stool and softens
Answer:
I Think its fiber helps digestion and can prevent constipation.and soluble fiber helps lower cholesterol, which may prevent heart disease.
Explanation:
James Joule showed that _______ was a form of energy.
Answer:
Heat
Explanation:
He proved that heat was a form of energy. That is why the Joule (1 N*m or 1 kg*m^2/s^2) is the SI unit of energy. We now know that heat energy is a form of kinetic energy associated with temperature changes due to the vibrational motion in matter.
How might this graph be different if the farmers had grown a wide variety of potato plants or had included other crops in their fields? Construct an explanation to support your answer. Construct an explanation to support your answer.
The graph would not have plummeted if various species were planted due to improvement of the potato crops.
What is variety?
The term variety has to do with the planting of different species of plants on the same farm. We know that the planting of different species of the same crop helps to improve the resistance to diseases of a plant.
Hence, the graph would not have plummeted if various species were planted due to improvement of the potato crops.
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Describe the properties of alkali metals. based on their electronic arrangement, explain whether they exist alone in nature.
The alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.
What are the properties of alkali metals?The alkali metals have the high thermal and electrical conductivity. It has high lustre, ductility, and malleability as compared to other materials. Each alkali metal atom has one electron in its outermost shell which make more reactive.
So we can conclude that the alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.
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Identify the genotypic and phenotypic ratios of offspring in the standard monohybrid cross.
Parent 1: _______________
Garden pea plant with homozygous gene pair for round seed
Garden pea plant with homozygous gene pair for wrinkled seed
Genotype (Parent 1): _______________
RR
rr
Parent 2: _______________
Garden pea plant with homozygous gene pair for round seed
Garden pea plant with heterozygous gene pair for round seed
Genotype (Parent 2): _______________
RR
Rr
The genotype and phenotype ratio for the first cross will be 100% Rr and 100% round, while the second cross will be 1RR:1Rr, 50/50 round and wrinkled respectively.
Monohybrid crossesAssuming that the seed shape allele is R(r).
For the first cross: RR x rr
Rr Rr Rr Rr
Genotype ratio = 100% Rr
Phenotype ratio = 100% round
For the second cross: RR x Rr
RR Rr RR Rr
Genotype ratio = 1RR : 1Rr
Phenotype ratio = 50% round and 20% wrinkled.
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Which are examples of biotic factors? Select three options.
rotting log
stream water
dead leaves
bacteria
soil
The biotic factors are bacteria soil, dead leaves, and stream water.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
The dead leaves of plants are an abiotic factor, the bacteria in soil are living matter and stream flowing, etc.
Hence, the biotic factors are bacteria soil, dead leaves, and stream water.
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Consider the dissociation of srso4, which has a ksp of 3.2 x 10-7. what do the three rows of (i,c,e) stand for in the table? how can the table be used to find equilibrium constants for this example?
The concentration of the ions of the solution is 5.7 * 10^-4 M.
What is the ICE table?The ICE table can be used to determine the equilibrium constant of the process; SrSO4(s) ⇔ Sr^2+(aq) + SO4^2-(aq). ICE stands for initial, concentration and equilibrium.
Thus;
SrSO4(s) ⇔ Sr^2+(aq) + SO4^2-(aq)
I 0 0
C +x +x
E x x
Now;
Ksp = x^2
x = √Ksp
x = √3.2 x 10-7
x = 5.7 * 10^-4 M
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Which lists only abiotic factors in this environment?
grass, tree, rock, soil
bird, turtle, grass, tree
sun, water, grass, soil
water, rock, soil, sun
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun
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[tex] \begin{gathered}\\ \underline{\boxed{\large\leadsto\frak\red{ Answer :- }}} \\ \end{gathered}[/tex]
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.What is an abiotic factor?
An abiotic factor is a non-living part of an ecosystem that shapes its environment.Biotic and abiotic factors make up a community via interaction. Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things. Hence, in this case,♠ Among the list of components given, the abiotic factors are water, rock, soil, sun
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Which equilibrium represents a buffer equilibrium?
A.
HI + H2O H3O+ + I-
B.
HCN + H2O H3O+ + CN-
C.
NaOH OH- + Na+
D.
HCl + H2O H3O+ + Cl-
E.
HClO4 + H2O H3O+ + ClO4-
The equilibrium represents a buffer equilibrium is HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)
What is equilibrium?Equilibrium is a process that occur in chemical reaction in which there is balance and stability. The rate of forward reaction is equal to the rate of backward reaction.
Buffer solution refer to a solution that have conjugate base and weak acid.
In buffer equilibrium, the weak acid isequal to the conjugate base be
Therefore, The equilibrium represents a buffer equilibrium
is HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)
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(You do) If you have 47.2 mol of Na available, along with an excess of Cl₂, how many grams of NaCl can you produce?
Equation: 2Na+Cl2=2NaCl
Answer:
2,760 grams NaCl
Explanation:
To find grams of NaCl, you need to (1) convert moles of Na to moles of NaCl (via mole-to-mole ratio from reaction) and (2) convert moles of NaCl to grams (via molar mass from periodic table). The final answer should have 3 significant figures based on the given measurement.
2 Na + Cl₂ --> 2 NaCl
Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol
Molar Mass (NaCl) = 58.44 g/mol
47.2 moles Na 2 moles NaCl 58.44 grams
---------------------- x --------------------------- x ------------------------- =
2 moles Na 1 mole NaCl
= 2,758.368 grams NaCl
= 2,760 grams NaCl
Explain the process of how clouds form
Answer:
clouds are formed when the invisible water vapour in the air condenses into visible water droplets or ice crystal
Answer: Clouds need two things to form: cool air and particles on which water vapor can condense. Clouds form as air cools. Cold air cannot hold as much water vapor, so the water vapor condenses. Water vapor condenses on small particles in the atmosphere, such as smoke, salt, and dust. As a result, clouds form.
Explanation: correct on edge
A sample of helium gas has a volume of 6.50l at a pressure of 845 mmhg and a temperature of 25oc. what is the pressure of the gas in atm when the volume and temperature of the gas sample are changed to 1850 ml and 325 k
Answer:
4.25atm
Explanation:
[tex]\frac{P1V1}{T1}\\[/tex]=[tex]\frac{P2V2}{T2}[/tex]
where ,
p1 =845/760=1.11atm
v1=6.50l
t1=25c +273k=298k
p2=?
v2=1850/1000=1.85l
t2=325k
so answer is 4.25 atm