Because amount has no effect on mass percentages, the mass percentage of carbon in 5, 50, and 500 g of sucrose is 42.1 %
The mass:
It also represents the body's inertia, or resistance to acceleration (change in velocity) when a net force is applied. The mass of an object dictates the strength of its gravitational attraction to other bodies.
The kilogram is the SI base unit of mass (kg). Mass is not the same as weight in physics, despite the fact that mass is frequently calculated by measuring the object's weight using a spring scale rather than a balance scale and comparing it directly with known masses. Because of the reduced gravity, an object on the Moon would weigh less than it does on Earth, yet it would still have the same mass.
Molecular formula of sucrose is C12 H22 O11
Molar mass of Sucrose , C12 H22 O11 is = ( 12 x 12 ) + ( 22 x 1 ) + ( 11 x 16 ) g/mol
= 342 g/mol
The molar mass of Carbon is 12 g/mol
342 g of C12 H22 O11 contains 12 x 12 g of C
5 g of C12 H22 O11 contains Y g of C
Y = ( 12x12x 5 ) / 342
= 2.105 g of C
mass % of C = (mass of C / mass of sucrose ) x 100
= (2.105 / 5 ) x 100
= 42.1 %
342 g of C12 H22 O11 contains 12 x 12 g of C
50.0 g of C12 H22 O11 contains Y g of C
Y = ( 12x12x 50 ) / 342
= 21.05 g of C
mass % of C = (mass of C / mass of sucrose ) x 100
= (21.05 / 50 ) x 100
= 42.1 %
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Compare the movements and positions of people dancing with the motions of water molecules in liquid water and in water vapor.
The comparison is that Everyone has a partner when ballroom dancing, and groups dance together on a big stage, much like liquid water in a container. In this condition, water molecules form hydrogen bonds with one another, much as how couples dance in a ballroom.
How is the movement of particles different in solid ice liquid water and water vapor?In water vapor, particles move more freely and occasionally collide, as in the dance motion used in freestyle dancing.
Freestyle dancing is essentially improvising dance steps to a song on the fly without any prior choreography, so each dancer has their own unique dance. It is the same for water vapor since, as a gas, it flows in a variety of directions with each particle following its own unique path.
Note that on a molecular level, particles have less energy and mobility when they are in solid form (liquid water), whereas they have more energy and are more widely spaced out when they are in gas form (water vapor).
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If the rate of change of Cl2 is –0.0500M/s, what is the rate of change of NO?2NO (g) + Cl2 (g) -------> 2NOCl (g) ______ M/s
The question requires us to calculate the rate of change of NO, given that the rate of change of Cl2 is -0.0500 M/s.
The balanced chemical reaction provided is:
[tex]2NO_{(g)_{}}+Cl_{2(g)}\to2NOCl_{(g)}_{}[/tex]From the stochiometry of the reaction we can say that Δ[NO] = 2/1 Δ[Cl2], thus we can calculate the rate of change of NO as:
[tex]\Delta\lbrack NO\rbrack=2\Delta\lbrack Cl_2\rbrack\to\Delta\lbrack NO\rbrack=2\times(-0.0500M/s)=-0.100M/s[/tex]Therefore, the rate of change of NO is -0.100 M/s.
Which statement best describes the connection between environmental stress and maturation in girls? Question 3 options: Puberty occurs earlier in girls who have experienced chronic stress. Puberty occurs later in girls who have experienced chronic stress. The onset of puberty in girls is determined genetically, thus stress has no effect on the timing of puberty. The effects of stress on maturation in girls are unknown.
The connection between environmental stress and maturation in girls is that puberty occurs earlier in girls who have experienced chronic stress.
What is puberty?The term puberty refers to the time in the life a person in which secondary se--xual characteristics begin to occur. It is the time that a person begins to mature. This period could also be called the adolescence stage of person.
When a developing person is at this stage, there are several kinds of characteristics that show that the person have arrived at this stage of life. ow we know that there is a connection between the environmental stress and maturation in girls. This implies that as a result of environmental changes that some girl may seem to have an earlier or a later puberty. This can now explain the diversities in the times in which a girl does experience puberty as we know it now.
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What is a newton?
Please help me
Answer:
the SI unit of force. It is equal to the force that would give a mass of one kilogram an acceleration of one metre per second per second, and is equivalent to 100,000 dynes.
Answer:
A newton is a unit of force
Emily and Sarah are designing an experiment to test how far 1-kg, 2-kg and 4-kg metal washers can be pulled using the same force. What must remain constant in the girls’ experiment?
To compare the effect of force on objects with different forces the acceleration must be constant and the air resistance have to be neglected.
What is force?Force is an external agent that acts on body to change it from the state of motion or rest. There are various kind of forces like gravitational force, frictional force, nuclear force etc.
In physics force is the product of mass and acceleration of a moving body. Thus F= ma. Hence, force is directly proportional to the mass and acceleration.
As the mass increases force acting on the body increases. Thus the force acting on 4 kg-metal will be higher.But to compare the same force on these three metal blocks, the acceleration must be constant. One more thing that the air resistance have to be neglected.
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Electrons are transferred from atoms of
sodium
to atoms of
phosphorus
. This transfer makes the sodium atoms
and the phosphorus atoms
. As a result, the sodium and phosphorus atoms strongly
each other.
Electrons are transferred from atoms of sodium to atoms of phosphorus this transfer makes the sodium atoms and the phosphorus atoms as a result, the sodium and phosphorus atoms strongly each other and it form sodium phosphide
Electron are smallest particles that make up an atom and they posses negative charge
Here given data is when electron are transferred from atom of sodium to the atom of phosphorous and this transfer made the sodium and phosphorous atom and because the form sodium phosphide because sodium is positive and phosphorous is negative and this positive negative are attracts and form sodium phosphide
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Please select either A, B, C, or D at the end.
Molar ratio is widely used in stoichiometry and it represents the number of moles of a compound needed to react with another compound in order to produce a specific amount of product, as the reaction we have in the question:
2 H3PO4 + 3 FeBr2 -> 6 HBr + Fe3(PO4)2
If we have H3PO4 as the focus, we will have the following molar ratios:
2 H3PO4 = 3 FeBr2
2 H3PO4 = 6 HBr
2 H3PO4 = 1 Fe3(PO4)2
These are the specific amounts of reactants needed and products produced in order for the reaction to occur
Therefore the answer is letter B, since 2 H3PO4 = 2 H3PO4 is not a correct molar ratio
Mrs. Roberts’s class won a day at the bowling alley for their good behavior all year. When they arrived, Jason picked the green ball that weighed 6 lbs., and Amanda picked the yellow ball that weighed 12 lbs. Amanda was having a hard time getting her ball to roll down the lane. Jason was doing great! He was pushing his ball hard, and it was going straight down the center. He even got a strike twice!
Answer:
6+12=18Explanation:
i don't quite know what the question is here, but...
6+12=18 or Amanda's ball is heavier so the ball would have a hard time, again I don't know what the real question is here
Answer:
Amanda’s ball is heavier so it’s harder throw
Explanation:
Claim: The reason why Amanda was having such a hard time was because she choose a heavier ballEvidence: Jason had no problem with his ball which was 6lb but Amanda was struggle with double the weight of Jason’s ball weight which was 12lb having more mass.Reasoning: Jason picked up a ball with less mass weighting at 6 pounds but because of this his ball was much easier to roll. This was due to Newton’s second law since he had such a lighter ball it was easier for him to through. Newton’s second law is force equal mass times acceleration (f=ma). The opposite could be said about Amanda her ball was so heavy that’s why it was harder to throw. When the mass of Amanda's ball is thrown onto the alley it goes slower because it has much more mass to weight it down, giving the ball less acceleration.
Methanol has a density of 0.792 g/mL. What is the volume of 0.5 moles of methanol?
20.23 mL is the volume of 0.5 moles of methanol, if it has a density of 0.792 g/mL.
What is methanol?Methanol (CH3OH), also known as methyl alcohol, wood alcohol, or wood spirit, is the most basic of a large group of organic compounds known as alcohols. It is made up of a methyl group (CH3) connected to a hydroxy group (OH).
The destructive distillation of wood once produced methanol. The direct combining of hydrogen and carbon monoxide gas in the presence of a catalyst is the foundation of the modern method for making methanol. Syngas, a blend of carbon monoxide and hydrogen produced from biomass, is being used more frequently to create methanol.
The formula for density is
Density = mass/volume
Here, density is given that is 0.792 g/ml
mass is 0.5 moles which is equal to 16.02g (substance mass conversion)
Now we need to find volume that is
V = mass/density
V = 16.02g/0.792 g/mL
V = 20.23 mL
Thus, 20.23 mL is the volume of 0.5 moles of methanol
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How much energy would it take to heat a section of the cooper tubing that weighs about 650.0g, from 15.83C to 24.11C
Energy would it take to heat a section of the copper tubing that weighs about 650.0g, from 15.83°C to 24.11°C is 2.072 KJ.
The formula heat energy is given by :
q = mcΔT
given that :
m = 650.0 g
specific heat of copper c = 0.385 J/g °C
T1 = 15.83°C
T2 = 24.11°C
ΔT = T2 - T1 = 24.11°C - 15.83°C = 8.28 °C
putting all the values in the formula :
q = mcΔT
q = 650.0 g × 0.385 J/g °C × 8.28 °C
q = 2072.2 J = 2.072 KJ
Thus, Energy would it take to heat a section of the copper tubing that weighs about 650.0g, from 15.83°C to 24.11°C is 2.072 KJ.
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A certain second-order reaction (B products) has a rate constant of 1.45x10^-3 M^-1•s^-1 at 27°C and an initial half-life of 228 s. What is the concentration of the reactant B after one half-life?
The concentration of reactant B after one half-life is equal to 1.512M.
What is the second-order reaction?A reaction is said to be a second-order reaction when the overall order of the reaction is equal to two. Suppose the reaction can be represented as follows:
A + A → P
The rate of second-order reactions can also be written as r = kA²
The term k'' is the rate constant for the second-order reaction and the unit of the reaction rate (r) is moles per liter per second (molL⁻¹s⁻¹) and the unit of the second-order rate constant is M⁻¹s⁻¹.
The half-life of the second-order reaction is:
[tex]t_{\frac{1}{2} } = \frac{1}{B_oK}[/tex]
where B₀ is the initial concentration of reactant B.
Given the rate constant of the 2nd order reaction, k = 1.45× 10⁻³M⁻¹s⁻¹
The half-life of the reaction, [tex]t_{\frac{1}{2} } = 228 sec[/tex]
B₀ = 1/ (1.45× 10⁻³) × 228
B₀ = 3.025M
The concentration of the reactant B after one half-life = B₀/2 = 1.512 M
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I NEED HELP ASAP!
Isotopes of certain ___ elements that spontaneously emit ___ and ___ from the ____.
Isotopes of certain _radioactive__ elements that spontaneously emit _radiation__ and _rays__ from the _nuclei___
What cause Isotopes to emit radiation ?Any of multiple species of the same chemical element with differing masses whose nuclei are unstable and spontaneously produce radiation in the form of alpha, beta, and gamma rays are known as radioactive isotopes, also known as radioisotopes, radionuclides, or radioactive nuclides.
Isotopes are identical elemental atoms with differing quantities of neutrons. Numerous elements have one or more radioactive isotopes. Due to the instability of their nuclei, they decay and release radiation.Many of the radioisotopes in the uranium, thorium, and actinium natural radiation decay series, as well as the naturally occurring radioisotopes potassium-40 and carbon-14, generate gamma radiation.Learn more about Isotopes here:
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Blue light has a frequency of 6.46 x 10^14 s-1. What is the energy of one quantum of blue light?
The energy of one quantum of blue light that has a frequency of 6.46 x 10¹⁴ s-¹ is 4.28 × 10-¹⁹J.
How to calculate energy of a photon?A photon refers to the quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime.
The energy of a photon can be calculated by using the following formula:
E = hf
Where;
E = energy (Joules)h = Planck's constant (6.626 × 10-³⁴J/s)f = frequencyAccording to this question, blue light has a frequency of 6.46 x 10¹⁴ s-¹. The energy can be calculated as follows:
E = 6.626 × 10-³⁴ × 6.46 x 10¹⁴
E = 4.28 × 10-¹⁹J
Therefore, 4.28 × 10-¹⁹J is the energy of the blue light.
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What is the molarity of calcium bicarbonate if 9.56 mL of 1.30 M HNO3 is required in a titration to neutralize 50.0 mL of a solution of Ca(HCO3)2?
Answer:
=> 0.12428 M
Explanation:
To begin, write down a balanced equation;
Ca(HCO3)2 + 2HNO3 => Ca(NO3)2 + 2H2O + 2CO2
Then calculate the number of moles contained in 9.56 mL of 1.30M HNO3
We know that molarity is contained in 1000mL
1000 mL = 1.30 moles
9.56 mL = ?
= (9.56 × 1.30)/1000
= 0.012428 moles
Mole ratio
Ca(HCO3)2 : HNO3
1 : 2
But, xmoles : 0.012428 moles
x = 1/2 × 0.012428
= 0.006214 moles
This moles is contained in 50 mL solution.
50 mL = 0.006214 moles
1000 mL = ?
= (1000 × 0.006214)/50
= 0.12428M
A ball with a mass of 5.0 kg is lifted off the floor at a height of 1.72m. What is its
potential energy? Include the appropriate units for full points.
The potential energy is 84.366 J.
We know that, potential energy is PE= mgh
PE= 5.0 * 9.81 * 1.72
PE= 84.366 J
Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is compressed or stretched, its potential energy increases. If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy. It is capable of performing more work when raised. Potential energy is a characteristic of systems rather than of particular bodies or particles; for instance, the system made up of Earth and the elevated ball has more potential energy as they become further apart.
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What is the pH of a 0.63 M solution of carbonic acid?
Report your answer to 2 decimal places.
The pH of a 0.63 M solution of carbonic acid is 0.2.
How to calculate pH?pH of a solution is a measure of how acidic or basic water is. The range goes from 0 - 14, with 7 being neutral. pH of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
pH is a measure of the relative amount of free hydrogen and hydroxyl ions {H⁺} in the water. The pH of a substance or solution can be calculated using the following formula:
pH = - log {H⁺}
According to this question, a carbonic acid has a concentration of 0.63M. The pH of the solution is as follows:
pH = - log {0.63}
pH = 0.2
Therefore, 0.63M of carbonic acid has a pH of 0.2.
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What is the formula of the following compound names? Hydrochloric acid, Copper (ll) choride, Dinitrogen pentoxide, Aluminum sulfide, and Iron (ll) nitride
There are 3 nomenclature types, so you have to be attentive of which one it is:
Hydrochloric acid: It is a hydracid, it is composed only of the elements present in the name (hydrogen and chloride).
[tex]HCl\text{ }\rightarrow\text{ The oxidation number of the halogen is always -1}[/tex]Copper (II) chloride: It's a salt composed of a metal and a halogen. The oxidation number of the halogen is -1 also in this case. This type of nomenclature tells us which is the oxidation number of the copper also, and it is the number between the parenthesis (+2).
[tex]Cu^{+2}Cl^-\text{ }\rightarrow\text{ CuCl}_2[/tex]Dinitrogen pentoxide: This type of nomenclature shows the number of atoms of each element present in the formula (di is 2, and penta is 5):
[tex]N_2O_5[/tex]Aluminum sulfide: In the sulfides, there's the element named plus sulfur (with an oxidation number of -2). The aluminum only has +3 in its oxidation number:
[tex]Al^{+3}S^{-2}\text{ }\rightarrow\text{ Al}_2S_3[/tex]Iron (II) nitride: In this case, the nitride means it's going to be nitrogen (with an oxidation number of -3) and the other element, in this case, iron (with an oxidation number of +2, as it says in the name):
[tex]Fe^{+2}N^{-3}\text{ }\rightarrow\text{ Fe}_3N_2[/tex]When an electron beam strikes a block of
copper, x-rays of frequency 2.74 × 10^19 Hz
are emitted. What is the wavelength of these
x-rays?
Answer in units of pm.
The wavelength (in pm) of the x-rays, given that it has a frequency of 2.74×10¹⁹ Hz is 10.9 pm
How do I determine the wavelength of the x-rays?We understood that the velocity, wavelength and frequency of a wave are related according to the following equation:
Velocity (v) = wavelength (λ) × frequency (f)
v = λf
With the above equation, we can determine the wavelength. Details below.
The wavelength of the x-rays can be obtained as follow:
Frequency of x-ray (f) = 2.74×10¹⁹ HzVelocity of x-ray (v) = 3×10⁸ m/sWavelength of x-ray (λ) = ?v = λf
3×10⁸ = λ × 2.74×10¹⁹
Divide both sides by 2.74×10¹⁹
λ = 3×10⁸ / 2.74×10¹⁹
λ = 1.09×10⁻¹¹ m
Multiply by 10¹² to express in picometer (pm)
λ = 1.09×10⁻¹¹ × 10¹²
λ = 10.9 pm
Thus, we can conclude that the wavelength is 10.9 pm
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8.Explain the layout of the modern periodic table, including rows, columns, groups, and blocks. Be sure to explain what’s in each part of the periodic table.
In the modern periodic table, rows are known as the periods, which indicate the last electronic layer of an atom.
Columns are groups, which indicate the number of atoms in the last electronic layer.
Groups involve elements with similar properties, such as metals, non metals, actinides and lanthanides, halogens, noble gases, among others.
Blocks make reference to the orbitals in which the electron configuration end for each atom, those are s, p, d and f.
if a commercial fertiliser weighing 2.5 kg had the series 12–4–32 written on its label, what mass of nitrogen, phosphorus and potassium would you expect it to contain
Answer:
The fertilizer has 0.3kg of nitrogen, 0.1kg of phosphorus and 0.8kg of potassium.
Explanation:
The series 12-4-32 indicates the percentage of each element in the fertilizer. So, in this case, there are 12% of nitrogen, 4% of phosphorus and 32% of potassium, and the rest will be oxygen.
knowing that the 100% of the fertilizer is equivalent to 2.5kg, we can calculate the mass of each element using a mathematical rule of three:
• Mass of Nitrogen:
[tex]\begin{gathered} 100\%-2.5kg \\ 12\%-x=\frac{12\%*2.5kg}{100\%} \\ x=0.3kg \end{gathered}[/tex]• Mass of Phosphorus:
[tex]\begin{gathered} 100\%-2.5kg \\ 4\%-x=\frac{4\%*2.5kg}{100\%} \\ x=0.1kg \end{gathered}[/tex]• Mass of potassium:
[tex]\begin{gathered} 100\%-2.5kg \\ 32\%-x=\frac{32\%*2.5kg}{100\%} \\ x=0.8kg \end{gathered}[/tex]So, the fertilizer has 0.3kg of nitrogen, 0.1kg of phosphorus and 0.8kg of potassium.
A tank contains 5 moles of oxygen, O₂, 2 moles of nitrogen, N₂, and 3 moles of neon, Ne₂ at a total pressure of 20 atm.
What is the partial pressure of nitrogen, N₂?
The partial pressure of nitrogen, N₂ is 5moles .
A mole fraction: what is it?A measure of concentration is the mole fraction. The mole fraction, which is denoted by "X," is used to calculate the relative amounts of solute and solvents in a solution. The ratio of the total number of moles in the solution to the number of moles of a particular component is known as the mole fraction.
Total moles of oxygen ,nitrogen and neon are 5+ 2+ 3+ =10 moles.
[tex]X_{N2}[/tex] = moles of N2/total moles of solution
=> 2/10 = 5moles
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Question 1 (3 points)
Listed in the Item Bank are some important labels for sections of the image below.
Select the label for each corresponding area it identifies in
-noble gas
-alkaline earth metals
-transition metals
-alkali metals
-nonmetal
-metalloids
-halogens
Area 1 is Noble gases, Area 2 is alkali metals, Area 3 is metalloids, Area 4 is alkaline earth metals, Area 5 is non-metal, Area 6 is transition metals and Area 7 is halogens .
In this question, we need to Select the label for each corresponding area . Area 1 is of Noble gases also known as group 18 of the periodic table. Area 2 is of alkali metals in group 1 of the periodic table.
Area 3 is of metalloids present in between of metals and non-metals in the periodic table . Area 4 is of alkaline earth metals in group 2 of the periodic table . Area 5 is of non-metal. Area 6 is of transition metals. Area 7 is of halogens in group 17 of the periodic table.
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How many moles are in a gas sample occupying 0.500L at 170 mmHg and 250C?Group of answer choices0.004570.006002.183.483.85
Explanation:
To solve this kind of problem we usually use the ideal gas law. The formula is:
P * V = n * R * T
Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, T is the temperature. R is 0.082 atm*L/(mol*K), so we have to convert the temperature from °C to K and the pressure from mmHg to atm before solving the formula.
R = 0.082 atm*L/(mol*K)
V = 0.500 L
T(K) = T(°C) + 273.15 K
T(K) = 250 + 273.15 K
T(K) = 523.15 K
760 mmHg = 1 atm
P = 170 mmHg * 1 atm/(760 mmHg)
P = 0.224 atm
Now we can replace those values and solve the formula for the number of moles.
P * V = n * R * T
n = P * V/(R*T)
n = 0.224 atm * 0.500 L/(0.082 atm*L/(mol*K) * 523.15 K)
n = 0.00261 mol
Answer: There are 0.00261 mol in the sample.
If the temperature is 25 °C.
T = (273.15 + 25) K
T = 298.15 K
n = 0.224 atm * 0.500 L/(0.082 atm*L/(mol*K) * 298.15 K)
n = 0.00457 mol
Answer: There are 0.00457 mol in the sample.
CS₂(l) + 3O₂(g) → CO₂(g) + 2SO₂(g) 13. What volume of O₂(g) is required to react with excess CS₂(l) to produce 4.0 L of CO₂(g)? (Assume all gases are measured at 0°C and 1 atm.)
1.33 liters of O₂ is required to react with excess of CS₂ to produce 4 Liters of CO₂ gas.
The balanced chemical equation provided is,
CS₂(l) + 3O₂(g) → CO₂(g) + 2SO₂(g)
According to the reaction,
3 moles of O₂ forms one mole of CO₂.
So,
1 mole of O₂ = 1/3 moles of CO₂
We also know,
Amount of CO₂ formed is 4 L.
We also know,
Moles at 0°C and 1 atm = Volume of gas in liters/22.4
Moles of CO₂ = 4/22.4
Moles of CO₂ = 0.1785 moles.
Moles of O₂ required = 1/3 moles of CO₂
Moles of O₂ = 0.1785/3
Moles of O₂ = 0.0595
Volume of O₂ = Moles x 22.4
Volume = 0.0595 x 22.41
Volume = 1.33L
So, the volume of O₂ required is 1.33 Liters.
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If a car travels at 32.1km/hr, what is the car’s velocity in m/sec?
A car travels at 32.1 km/hour. The velocity of car in m/sec is 8.92 m/s.
What is velocity?Velocity is defined as the pace at which an object's location changes in relation to a frame of reference and time.
It can also be defined as the directional speed of a moving item as an indication of its rate of position change as seen from a specific frame of reference.
As we know 1 km = 1000m
1 hour = 3600 sec
So, 32.1 km = 32100 m
Velocity = distance / time
Velocity = 32100 / 3600
Velocity = 8.92 m/sec.
Thus, a car travels at 32.1 km/hour. The velocity of car in m/sec is 8.92 m/s.
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3 KOH + H3PO4 → K3PO4 + 3H₂O
how many moles of potassium phosphate will be produced from 44.7 g of potassium hydroxide?
Lye, commonly known as potassium hydroxide, is an inorganic substance with the chemical formula KOH. It is a powerful base that is also frequently referred to as caustic potash. It is applied in numerous manufacturing, industrial, and chemical processes.
How does potassium hydroxide fit into this Equation?3KOH(aq) + H3PO4(aq) ==> K3PO4(aq) + 3H2O(l).
According to this well balanced equation, we will produce ONE mole of K3PO4 from THREE moles of KOH.
Therefore, the first step is to determine how many moles of KOH are present in the current reaction.
moles KOH = 44.7 g KOH x 1 mol KOH/17.56 g = 3.44 moles KOH in the system at this time
How many moles of K3PO4 can we produce, then?
017.56 mole 3.44 moles of K3PO4 are created from 1 mol of K3PO4 and 1 mol of KOH.
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Which element when fused together with itself produces the most energy?
Answer:
Carbon
Explanation:
Carbon is a special element that can form covalent compounds at any shape.
Fuels all consists of carbon.
If you study organic chemistry you will learn more about the miracles of carbon.
18.Calcium-49, a radioactive isotope, has a half-life of 9 minutes. If an 80-gram sample of the isotope decays for 27 minutes, how many grams of the original sample remain?Select one:a. 60b. 10c. 40d. 20
Explanation:
The half-life period is represented by the abbreviation P. The time that a material has suffered disintegration is represented by t. Thus, if we know the half-life and the disintegration time (represented by x), we can say how many half-lives a material has gone through until a certain moment. This is done through the relationship below:
t = x * P
With this knowledge, we can still determine the mass that remains after the half-life period from the expression:
m = mo/2^x
were m = mass left
mo = initial mass
x = half-life
Here we have:
P = 9 minutes
t = 27 minutes
x = ????
mo = 80 g
So first let's find x:
t = x*P
27 = x*9
x = 3
now let's find m:
m = mo/2^x
m = 80/2^3
m = 80/8
m = 10 g
Answer: b. 10
Nitrogen fluoride is a covalent compound. Draw a diagram showing the arrangement of the valency electrons in one molecule of the covalent compound nitrogen trifluoride, NF3 Use x for an electron from a nitrogen atom and o for an electron from a fluorine atom. i.
Nitrogen Flouride is an important covalent compound. A diagram showing the arrangement of the valency electrons can be drawn using Lewis Dot Structures.
The basic principle of Lewis Dot Structures is obtaining either a doublet or octet. Nitrogen being a second-period element posses orbitals to accommodate 8 electrons. The electronic arrangement of fluorine can be stabilized by forming a doublet.
Let:
Use 'x' to depict electrons of NitrogenUse 'o' to depict electrons of FluorineNitrogen Flouride is pyramidal in existence, with the presence of one lone pair of Nitrogen. The hybridization of 'N' in this covalent molecule is 'sp3'.
Learn more about Lewis Dot Structure:
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Four resistors are connected in a series circuit 10Ω, 60Ω, 50Ω, 30Ω across a 75 V battery.
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