Answer: 207.217 amu
Work:
203.973 amu *(0.014) = 2.855 amu
205.974 amu *(0.241) = 49.639 amu
206.976 amu *(0.221) = 45.741 amu
207.977 amu *(0.524) = 108.979 amu
2.855 + 49.639 + 45.741 + 108.979 = 207.217amu
Explanation:
The average atomic mass has been defined to be the total mass given by the relative abundances and masses of the isotopes. The average atomic mass of lead is 204.359 amu.
What is average atomic mass?The average atomic mass has been given by the masses and relative proportions and abundances of the isotopes of the elements that differ from the mass of the element in the periodic table. It is the average mass given by the sum of the masses and the abundances.
Given,
Abundance of lead-206 = 24.1%
The abundance of lead-207 = 22.1%
The abundance of lead-208 = 53.8%
Mass of lead-206 = 205.974 amu
Mass of lead-207 = 206.976 amu
Mass of lead-208 = 207.977 amu
The average atomic mass is given as:
= (205.974 × 0.241) + (206.976 × 0.221) + (207.977 × 0.524)
= 49.639 amu + 45.741 amu + 108.979 amu
= 204.359 amu
Therefore, 204.359 amu is the average atomic mass.
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How do nicotine and tobacco cause cancer?
Answer:
by damaging or changing a cell's DNA
Explanation:
Montrel takes a trip to Central America during the winter. He finds out that the temperature in Central America is about the same year round. Which of the following could explain why?
Options:
A: Central America is near the North Pole.
B: Central America is near the South Pole.
C: Central America is near the equator.
D: Central America is near sea level.
Answer:
C
Explanation
Because My teacher told me that for an example Florida is hot but in Central America is cold or hot and you don’t need a jacket. I don’t remember much
The Central America is near the equator could explain the above statement.
What is equator?Equator is an imaginary line that passes through the centre of the globe at 0 degrees latitude and at equal distance between the North and South Poles.
Some countries of Central America are situated near the equator. The places near equator have little seasonal variation. These places have same amount of daylight and darkness throughout the year and remain warmer year round. These places near the equator have an alternating dry and rainy seasons.
Hence, we can conclude that option C is the answer.
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Which one is it First to answer (correct) gets brainlist
Answer:
D
Explanation:
A pie chart (or a circle chart) is a circular statistical graphic, which is divided into slices to illustrate numerical proportion. ... While it is named for its resemblance to a pie which has been sliced, there are variations on the way it can be presented
titsssss is the answerr mateeee
What is one example of reusing water?
taking shorter showers each day
watering the yard in the morning
watering flowers with dirty dishwater
turning off water in the sink while brushing teeth
Answer:
C-watering flowers with dirty dishwater
Explanation:
Name the intermolecular force in the compound N = O
how much is 3.5 gallons in cups
Answer:
3.6 gallons are equal to 56 cups
heavy vechicle have back wheels in pairs. why
because without the extra wheels the vehicle would be to heavy and not be able to support the extra weight thus the vehicle would be useless hope this helped brainlies plz
Anyone get this please help me, can you do it step by step please
Answer:
approx 17.1429 days rounded up = 18days
Explanation:
400÷70 =5.7143 × 3 = 17. or rounded up = 18days
In the outer layer of the sun, energy is transported outward by the rising of hot plasma and sinking of cooler plasma. This transfer is known as __________.
a.Electromagnetic radiation
B.Convection
C. Solar flares
D. Conduction
Answer:
solar flares
Explanation:
We have that The outward transportation of sun rays by the rising of hot plasma and sinking of cooler plasma is Known as
Solar flaresOption D
From the question we are told
In the outer layer of the sun, energy is transported outward by the rising of hot plasma and sinking of cooler plasma. This transfer is known as __
Generally
When the sun give off Heat energy it does this by the rising of hot plasma and sinking of cooler plasma
This Process is defined by scientist around the world as Solar flares and this
is the reason why the rays if the sun reaches earth.
Therefore
The outward transportation of sun rays by the rising of hot plasma and sinking of cooler plasma is Known as
Solar flares
Option D
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What is the name of the process that plants and animals undergo to release carbon
List the following elements in order of increasing atomic radius:
1. sulfur II. hydrogen III. strontium IV. iodine
V. oxygen
Answer:
sulfur
hydrogen
iodine
oxygen
strontium
Explanation:
An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.
In general, the size of an atom will decrease as you move from left to the right of a certain period.
Order of increasing atomic radius:
O < H < S < I < Sr
Describe the trend of atomic radius.The atomic radius measures the separation between an atom's nucleus and its farthest electrons.
The trend across a periodAtoms' atomic radii typically decrease from left to right.As electrons are added to the same primary energy level, protons are gradually added to the nucleus. Because of the increased positive charge on the nucleus, these electrons are gradually drawn closer to it. Atomic sizes shrink as the strength of attraction between nuclei and electrons grows.The trend down the groupWithin a group, atoms' atomic radii typically increase from top to bottom. Again, the positive nuclear charge rises as the atomic number decreases inside a group. The number of major energy levels that are occupied is increasing as well, though. The orbitals from higher primary energy levels have greater sizes than the orbitals from lower principal energy levels. Atomic radius increases down a group as a result of the stronger impact of the major energy levels outweighing the increase in nuclear charge.Learn more about atomic radius here:
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Can someone please definition of atomic radius using , nucleus, valence electrons and energy.❤️
Answer:
Explanation:
-The Atomic Radius of an element is the distance between the center of an atom
-nucleus and its outermost, or valence electrons. ... These changes are caused by the interaction between the positive charge of the protons
- nucleus and the negative charge of all the atom's electrons.
Which characteristic influences the polarity of these molecules?
(Molecules are; CCI4, NH3, CH4, H20, CO2) P.S WILL GIVE BRAINLIEST AND 5 STARS+ THANKYOU! :)
Answer: electronegativity,
Explanation:
The molar absorptivity of a compound at 500 nm wavelength is 252 M-1cm-1. Suppose one prepares a solution by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution. What would be the absorbance in a 3 .00 mm pathlength cell?
Answer:
The absorbance of the solution is 0.21168.
Explanation:
Given that,
Wavelength = 500 nm
Molar absorptivity = 252 M⁻¹ cm⁻¹
Number of moles = 0.00140
Volume of solution = 500.0 mL
Length = 3.00 mm
We need to calculate the molar concentration
Using formula of the molar concentration
[tex]C=\dfrac{N}{V}[/tex]
Where, N = number of moles
V = volume
Put the value into the formula
[tex]C=\dfrac{0.00140}{0.5000}[/tex]
[tex]C=0.0028\ M[/tex]
We need to calculate the absorbance of the solution
Using formula of absorbance
[tex]A=\epsilon C l[/tex]
Put the value into the formula
[tex]A=252\times0.0028\times0.300[/tex]
[tex]A=0.21168[/tex]
Hence, The absorbance of the solution is 0.21168.
The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 3 .00 mm pathlength cell, is 0.212.
First, we will calculate the molarity of the compound, which is equal to the moles of solute divided by the liters of solution.
[tex]M = \frac{0.00140mol}{0.5000L} = 0.00280 M[/tex]
Then, we will convert 3.00 mm to cm using the conversion factor 1 cm = 10 mm.
[tex]3.00 mm \times \frac{1cm}{10mm} = 0.300 cm[/tex]
Finally, we will calculate the absorbance of the compound using the Beer–Lambert equation.
[tex]A = \epsilon \times b \times C[/tex]
where,
A: absorbanceε: molar absorptivityb: length of light pathC: molar concentration[tex]A = \epsilon \times b \times C = \frac{252}{M.cm} \times 0.300 cm \times 0.00280 M = 0.212[/tex]
The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 3 .00 mm pathlength cell, is 0.212.
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A cubic object has a volume of 250 cm. What is its density if its mass is 5 points
257.3 g?
Answer:
The answer is 1.03 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 257.3 g
volume = 250 cm³
We have
[tex]density = \frac{257.3}{250} \\ = 1.0292[/tex]
We have the final answer as
1.03 g/cm³Hope this helps you
1. A student measures the height of a small lamp to be 32cm. According to the factory specifications,
the lamp is actually 30cm. What is the percent error of the student's measurement?
Answer:
6.67 %
Explanation:
Given that,
Measured height of a small lamp, l = 32 cm
Actual height, l' = 30 cm
We need to find the percent error of the student's measurement. Percent error is given by :
[tex]\%=\dfrac{|l-l'|}{l'}\times 100[/tex]
Putting all the values, we get :
[tex]\%=\dfrac{|32-30|}{30}\times 100\\\\\%=\dfrac{2}{30}\times 100\\\\\%=6.67\%[/tex]
So, the percent error of the student's measurement is 6.67 %.
Describe how the organelles in a cell work together to keep an organism alive
Answer:
These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. ... All of the cell's organelles must work together to keep the cell healthy.
Explanation:
These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. ... All of the cell's organelles must work together to keep the cell healthy.
two atoms With diferent mass number but the same atomic number are called
Answer:
they are called isotopes
An example of a solution is vinegar because it has 5% acid and 95% water True orFalse
Answer:
The answer is true!
Explanation:
The half-life of a radioisotope
a
gets shorter with time
b
is constant
c
get shorter with increasing temperature
d
decreases by a factor of two each time
e
become longer over time
Answer:
b is constant
Explanation:
The half-life of a radioisotope is constant throughout its life cycle.
Half-life is the time taken for half of the radioactive nuclei to disintegrate.
Every radionuclide has its characteristic half-life and it is independent of the number of radioactive atoms.
The half-life does not depend on any variable. It is an inherent property of a radioactive isotope. The shorter the half-life, the faster a radionuclide decays. Nuclides with a long half life are fairly stable for a long period of time. The decay of a radioactive element is usually characterized by its half-life.Therefore, the most ideal statement about half-life is that it is constant.
The process of water migrating from areas of low electrolyte concentration to area of high electrolyte concentration is called ———————. ——————— is the medicine term for the swelling of the brain
Answer:1-Diffusion
2-Cerebral edema
Explanation:
The process of water migrating from areas of low electrolyte concentration to areas of high electrolyte concentration is called diffusion.
Cerebral edema is the medical term for the swelling of the brain.
What is diffusion?Diffusion is a process where the substance or ions of from a low concentration to a high concentration. It occurs against the concentration gradient, so it needs energy.
Cerebral edema is a condition where fluid gets filled in the brain and the brain swells and make pressure on the skull called intracranial pressure.
Thus, Diffusion is the mechanism by which water moves from regions with low electrolyte concentrations to regions with high electrolyte concentrations.
The medical term for brain swelling is cerebral edema.
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30 Points!! 15 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer: 22: C
23: A
24: A
25: D
26: B
Explanation: I hope that this helped :)
Answer:
22) b. stainless steel.
23) c. they are all substances.
24) b. a compound can only be separated into its components by chemical means.
25) a. substances are compounds, mixtures are not.
26) b. capitalized
extra: not 100 percent sure of 25
Plz help, have a quiz on this plz PLZ
Answer:
20.82
Explanation:
The maximum potential energy of a box sliding from the top of a ramp to the bottom is at the top. Potential energy is stored energy. The box has the most stored energy at the top and it decreases as it slides down the hill.A box slides from the top of a ramp to the bottom, its maximum potential energy is located
A) at the top.
B) at the bottom.
C) equal at all locations.
D) at the exact middle of the ramp.
A:The top of the Ramp
Which of the four following items are made up of one or more molecules?
Group of answer choices
Salt
Neon
Hydrogen
Gold
Is 200 meters greater than 2000 centimeters
Answer:
200 meters.
Explanation:
2000 centimeters is 20 meters
100 centimeters = 1 meter
2000 divided by 100 = 20
Explanation:
Yes, 200 meters is greater than 2000 centimetres . Because 2000 centimetres is only 20 meters . So, 200 meters is greater.If you like this answer then mark this answer as BRAINLIEST answer.
Thank you ☺️☺️
Please solve number 5!! I’ll mark most brainliest!
Answer: 5.248
Explanation: 0.53/0.1010 = 5.24752475248, and round to the thousandths.
At present, fusion reactions... Group of answer choices produce the energy in some nuclear power plants. cannot be used to produce energy in reactors. produce the energy in all recent nuclear power plants. produce the energy in most nuclear power plants.
Answer:
cannot be used to produce energy in reactors.
Explanation:
Currently, there is no reactor that can allow the use of nuclear fusion, although nuclear plants use nuclear fission reactors.
Nuclear fusion happens when thousands of atoms collide with each other when they are in the midst of extreme conditions of literature and pressure. This collision causes the atoms to fuse, creating another element. The process releases amounts of light and heat, promoting a high release of energy. This whole process occurs without the release of CO2 into the atmosphere, without the release of toxic waste and without the risk of explosions, which makes nuclear plants have a strong interest in building a reactor to use this type of energy. For this reason, scientists from different countries have collaborated with each other on a project called Iter, which seeks to build a reactor and achieve the first reaction in 2025.
one of the materials delivered by blood in the body. what is it?
Answer:
sugar and oxygen and nutrients
Explanation:
Blood brings oxygen and nutrients to all the parts of the body so they can keep working. Blood carries carbon dioxide and other waste materials to the lungs, kidneys, and digestive system to be removed from the body.
How can you relieve stress?