A student was instructed to measure 30 mL of water in a 50-mL beaker. She recorded the following data in her notebook:
Mass of water 30.0 g
Density of water at Room Temperature 0.997 g/mL
Calculate the student's absolute error.
The student's absolute error, given the data from the question is 0.09 mL
How to determine the volume the student measuredWe'll begin by obtainig the volume of the water the student measured. This can be obtained as follow:
Mass of water = 30.0 gDensity of water = 0.997 g/mLVolume of water =?Density = mass / volume
Thus,
Volume = mass / density
Volume of water = 30 / 0.997
Volume of water = 30.09 mL
How to determine the absolute errorThe absolute error can be obatined as illustrated below:
Accepetd value = 30 mLMeasured value = 30.09 mLAbsolute error =?Absolute error = Measured value - accepted value
Absolute error = 30.09 - 30
Absolute error = 0.09 mL
Thue, the student's absolute error is 0.09 mL
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Nonrenewable Resouces
Answer:there are four types they are oil,natural gas,coal, and nuclear energy
Explanation:
which information did milikan contribute to the understanding of electrons
Answer:
He figured out the amount of charge on an electron
Explanation:
Answer:
the accurate determination of the charge carried by an electron, using the e “falling-drop method”; he also proved that this quantity was a constant for all electrons, thus demonstrating the atomic structure of electricity.
Explanation:
Determine the mass of a 24.5 % calcium chloride solution that contains 15.8 grams of calcium chloride.
Considering the definition of percentage by mass, the mass of a calcium chloride solution is 64.49 grams.
Definition of percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
percentage by mass= (mass of solute÷ mass of solution)× 100
Mass of calcium chloride solutionIn this case, you know:
percentage by mass= 24.5%mass of solute= mass of calcium chloride= 15.8 gmass of solution= ?Replacing in the definition of percentage by mass:
24.5= (15.8 g÷ mass of solution)× 100
Solving:
24.5÷ 100= 15.8 g÷ mass of solution
0.245= 15.8 g÷ mass of solution
0.245× mass of solution= 15.8 g
mass of solution= 15.8 g÷ 0.245
mass of solution= 64.49 grams
Finally, the mass of a calcium chloride solution is 64.49 grams.
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Which property could be used to separate a mixture of salt and water?
A. boiling point
B. mass
C. electrical conductivity
D. magnetism
Answer:
boiling points
Salt water: Salt can be separated from the water by boiling, taking advantage of the different boiling points of the two substances.
An antacid contains 200 mg of aluminum hydroxide.
A. How many moles of Al(OH)3 does each capsule contain?
B. How many µg of oxygen does each capsule contain?
A. The number of mole of Al(OH)₃ in the capsule is 0.0026 mole
B. The mass (in µg) of oxygen in the capsule is 124800 µg
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
A. How to determine the mole of Al(OH)₃From the question given above, the following data were obtained:
Mass of Al(OH)₃ = 200 mg = 200 / 1000 = 0.2 gMolar mass of Al(OH)₃ = 27 + 3(16 + 1) = 78 g/mol Mole of Al(OH)₃ =?Mole = mass / molar mass
Mole of Al(OH)₃ = 0.2 / 78
Mole of Al(OH)₃ = 0.0026 mole
B. How to determine the mass (in µg) of oxygen1 mole of Al(OH)₃ contains 48 g of oxygen.
Therefore,
0.0026 mole of Al(OH)₃ will contain = (0.0026 mole × 48 g) / 1 mole = 0.1248 g of oxygen
Divide by 1000000 to express in µg
Mass of oxygen = 0.1248 / 1000000
Mass of oxygen = 124800 µg
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Calculate the energy for the transition of an electron from the n = 3 level to the n = 2 level of a hydrogen atom.
For hydrogen atoms, the energy difference for the electron transition from n = 3 to n = 2 is 0.326x[tex]10^{-18}[/tex] J.
What is electron transition?Electromagnetic radiation's emission or absorption, atoms and molecules undergo electronic transitions (typically UV or visible).
Planck's equation, E = h, relates the energy change connected to a transition to the frequency of the electromagnetic wave.
The energy of the photon is precisely the energy that is lost when an electron moves to a level with less energy.
The photons released when the electron shifts from n=3 or above to n=2 fall in the Visible Light part of the spectrum. These passages are known as Balmer's Series.
[tex]E_{J}[/tex] = 2.179 x [tex]10^{-18}[/tex] ([tex]\frac{1}{3^{2} }[/tex] -[tex]\frac{1}{2^{2} }[/tex])
= 0.326x[tex]10^{-18}[/tex] J
Thus, For hydrogen atoms, the energy difference for the electron transition from n = 3 to n = 2 is 0.326x[tex]10^{-18}[/tex] J.
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Assuming that 8.0 % of the energy output of a 65 W lightbulb is visible light and that the average wavelength of the light is
550 nm, how many photons are emitted by the lightbulb each second?
Express your answer using two significant figures.
1.0 x 10^19 many photons are emitted by the lightbulb each second.
Assume that 8.0% of the energy output of a 65 watt light bulb is visible light
Total energy = 65 x 8/100 = 5.2 watt light is visible light
One watt (W) is equal to 1 J/s
So, 5.2 watt = 5.2 J/s
Energy carried by one 550nm photon –
Use the relation between energy and wavelength
E photon = h c / lambda
= (6.63 x 10^-34 J s) x (3.00 x 10^8 m/s)/ 550 x 10^-9 m
= 3.62 x 10^-19 J
So how many of these photons will we need to make 3.5 Joules?
Assume we require N of them in total. Then,
3.5 Joules = N x 3.62 x 10^-19 J
N = 3.5 J / 3.62 x 10^-19 J
= 9.67 x 10^18
So, in order to emit 3.5 Joules per second, the lightbulb must emit 9.67 x 10^18 photons per second
If 5.9 % of the energy of 65 watt light is visible light
Total energy = 65 x 5.9/100 = 3.835 watt light is visible light
3.835 watt = 3.835 J/s
So how many of these photons will we need to make 3.835 Joules?
Let's assume we need some number N of them. Then,
3.835 Joules = N x 3.62 x 10^-19 J
N = 3.85 J / 3.62 x 10^-19 J = 1.0 x 10^19
So, in order to emit 4.43 Joules per second, the lightbulb must emit 1.0 x 10^19 photons per second
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if a system does not change its volume during the course of a process, does it do pressure-volume work?
There would be no volume pressure work done.
Is work done?Let us recall that work done in a pressure-volume work is the product of the pressure and the change in the volume of the gas. We know that we can write this as;
W = PΔV
P = pressure
V = volume
We can see that is the volume change is zero because the pressure does not change in the process, then it follows that the work done is zero.
When we say that something is constant, it means that such a thing does not change. In this case, we have been told that the volume does not change so it is constant. If we have agreed that the volume is constant end we could also agree that ΔV =0 and the volume does not change.
Hence, if a system does not change its volume during the course of a process, it does not do a pressure-volume work.
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What is Structural isomers
Convert: 28.3 micrograms to pounds.
28.3 micrograms equal to 6.2390820e⁻⁸ pounds.
A microgram is a unit of mass. 1 microgram is equal to one-millionth of a gram.
1 mcg = 0 lb
The pound is used in the imperial system for mass measurement.
1lb = 453592370 mcg
The SI or base unit for mass is the kilogram.
1 kg is equal to 1000000000 micrograms, or 2.2046226218488 pounds.
The conversion formula from micrograms to pound is:-
Pound (lb) = micrograms (mcg) ÷ 453592370
We have to convert 28.3 micrograms to pounds.
Dividing 28.3 with 453592370, we get
28.3 ÷ 453592370 = 6.2390820e⁻⁸ pounds
Therefore, 28.3 micrograms equal 6.2390820e⁻⁸ pounds.
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It is known that oxygen-16 reacts with magnesium metal. Oxygen-18 will also react with magnesium T or F
If particles are not created or destroyed, what must be true?
Answer:
that they are neither created or destroyed
What is the frequency of a photon of yellow light with a wavelength of 4.63 X 10-7m?
The frequency of a photon of yellow light with a wavelength of 4.63 X 10-⁷m is 6.48 × 10¹⁴ Hz.
How to calculate frequency?The frequency of a wave can be calculated by using the following formula:
v = fλ
Where;
v = velocity (m/s)f = frequency (Hz)λ = wavelength (m)According to this question, a photon of yellow light with a wavelength of 4.63 X 10-⁷m is given. The frequency of this photon can be calculated as follows:
f = 3 × 10⁸m/s ÷ 4.63 X 10-⁷m
f = 6.48 × 10¹⁴ Hz
Therefore, the frequency of a photon of yellow light with a wavelength of 4.63 X 10-⁷m is 6.48 × 10¹⁴ Hz.
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What is the oxidation number of N in NH4HCO3?
Answer:
For numerical purposes however, we can assume that each nitrogen is in +1 and overall oxidation... The oxidation of nitrogen in NH4+ is -3. The hydrogen atoms have +1 and there are four of them. And net charge on the molecule is +1.
Explanation:
How many atoms are in 1.50 mol of carbon-12? How many grams does this much carbon-12 weigh
The number of atoms that are in 1.50 mol of carbon-12 is 18g.
1 mol of any substance contains 6.022×1023 atoms/molecules
So 1.50 moles of carbon will have 1.50×6.022×1023 atom = 9.0×1023 atoms
Now, number of moles = weight g /molar mass gmol-1
1.5= weight g/ 12 gmol-1.
So weight = 1.5 mol×12gmol-1 = 18 g
Mole is the unit for the measurement of quantity of a substance.The number of moles is used a unit of measure large number of atoms and the other components.Mole is the standard unit for amount of substance.The elementary numbers of a certain substance are present in a substance or sample is determined by the quantity of that material.To learn more about moles visit:
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when heated lithium reacts with nitrogen to form lithium nitride
the balance equation 6Li(s)+N2(g)>2Li3N(s)
calculate the percentage yield of Li3N
The percentage yield of Li₃N is 28.63 %.
6Li(s) + N₂ (g) → 2 Li₃N (s)
According to balanced reaction
6 x 6.94 g Li reacts with 28 g N₂
12.8 g Li reacts with 12.8 x 28 / 6 x 6.94 = 8.61 g N2
But we have 34.9 g N₂. so N₂ present in excess
Limiting reagent = Li
6 x 6.94 g Li gives 2 x 34.83 g Li₃N
12.8 g Li gives 12.8 x 2 x 34.83 / 6 x 6.94 = 21.41 g Li3N
Actual yield = 6.13 g
Theoretical yield = 21.41 g
% yield = (actual yield / theoretical yield) x 100
% yield = (6.13 / 21.41) x 100
% yield = 28.63 %
Percentage yield is the percentage ratio of real yield to the theoretical yield. It's miles calculated to be the experimental yield divided through theoretical yield increased by a 100%. If the actual and theoretical yield are the equal, the percent yield is one 100%.
Percentage yield is the range calculated indicating the difference in percentage among the theoretical yield and real yield of an experiment. Whilst experimenting with unique solutions or inside the manufacturing of chemical solutions you have got by means of-merchandise and the real meant products.
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How many valence electrons are in Bi³+?
How can the enthalpy of the
following system be increased?
N2O4 (g) ⇌2NO2 (g)
∆Hrxn = +ve at constant temperature
A.By increasing the pressure of the
system
B.By decreasing the pressure of the
system
C.By increasing the temperature
D.By decreasing the temperature
E.None of the above
The enthalpy of the following system can be increased by increasing the temperature. So, the correct option is (c).
A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems at constant pressure, which the sizable surrounding environment conveniently provides.
The kinetic and potential energy of the atoms and molecules in a system rise as the system's temperature rises. As a result, the system's internal energy rises, which also raises its enthalpy. This is true whether the system is under constant pressure or volume.
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A 12 ounce can of a soft drink such as Coke Classic contains 39.0 g of sugar.
1 fluid ounce = 29.57 mL. What is the mass/volume percent of sugar in Coke
Classic?
A 12 ounce can of a soft drink such as coke classic contains 39.0 g of sugar. The mas / volume percent 10.99 % (w/v).
The soft drink ( classic coke ) contains sugar = 39.0 g
volume = 12 ounce
Mass/Volume percent = (mass of solute (g) / volume of solution (ml))×100
mass of solute = 39.0 g
volume of solution = 12 ounce
1 fluid ounce = 29.57 ml
volume of solution in ml = 12 × 29.57 ml = 354.84 ml
therefore ,
mass / volume % = (39.0 / 354.84 ) × 100 % (w/v)
= 10.99 % (w/v)
Thus,A 12 ounce can of a soft drink such as coke classic contains 39.0 g of sugar. The mass / volume percent is 10.99 %(w/v)
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express the number 0.000114 in scientific notation
Answer:1.14 10x^-4
Explanation:
How many grams of mercury are present in a barometer that holds 4.9 mL of mercury?
Express your answer using two significant figures.
66.15 grams of mercury are present in a barometer that holds 4.9 mL of mercury.
Equation :To calculate grams of mercury
Given data,
volume = 4.9 ml
density of mercury = 13.5 g/mL
weight = ?
Using formula,
weight of mercury = density of mercury x volume of mercury
weight of mercury = 13.5 g/mL x 4.9 mL
weight of mercury = 66.15g
What barometer is used for?An instrument widely recognized as a barometer is used to measure the air pressure in a specific environment. Weather changes in the short term can be predicted by pressure tendency. Surface weather analysis uses a variety of air pressure measurements to help identify surface troughs, pressure systems, and frontal boundaries.
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Can someone explain me how to solution this question.
There will be phase changes due to which bottle will break at the end.
Many substances have the ability to alter their phase without changing their chemical makeup. The example of water is familiar. The density of the substance is altered during a phase transition. The density unit of grams per cubic centimetre is an illustration. The solid phase will typically be denser than the liquid phase. The material sample will therefore take up less space in the solid phase than it does in the liquid phase.The water now freezes, causing a phase change that results in the formation of solid water (ice). Solid water has a different density than liquid water. The fact that solid water has a lower density than liquid water is a crucial characteristic.We will use this information to calculate the volume of solid water.
mass of water inside the bottle = 242g
Volume of solid water = 242 × mL/ 0.916 g
= 265 mL
This calculated volume of solid water (ice) is greater than the glass bottle's 250 mL capacity. Therefore, bottle will crack.
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When is water in a living part of the environment and when is it in a non-living part?
Answer:
Down >3
Explanation:
The nonliving processes such as evaporation, precipitation, etc... water returns back into the atmosphere.Explanation:Water moves through the help of living organisms in an ecosystem. Although, the non-livings processes are also the main partners of this process.Plants absorbs water through their root system and loss by transpiration. Watere also moves through the living organisms in an ecosystem. Other nonliving processes such as evaporation, precipitation, water returns back into the atmosphere!
Sorry For Miss Spelling >3
Question
Why do cell organelles have specialized functions?
So all cells can conduct photosynthesis
So all cells can conduct photosynthesis,
To make movement differ throughout a cell's life cycle
To make movement differ throughout a cell's life cycle,
To help a cell perform different cell activities
To help a cell perform different cell activities,
To dissolve the cell when it dies
The cell organelles have specialized functions in order to help a cell perform different cell activities (Option 3 is correct).
What are cell organelles?The cell organelles are membrane-bound structures inside eukaryotic cells that help them to perform specialized functions such as protein synthesis (ribosomes), photosynthesis (chloroplasts), lipid processing (RE and Golgi), enzymatic degradation (lysosomes), etc.
In conclusion, the cell organelles have specialized functions in order to help a cell perform different cell activities (Option 3 is correct).
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A student states that natural resources could be saved if people made everything they need in labs. What is the main problem with this idea?(1 point)
The materials made in labs will still pollute the environment and destroy natural resources.
Anything made in the lab requires natural resources to produce it.
There are not enough synthetic resources yet to make what people need.
People might think it is fine to waste a lot of the materials since they just came from a lab.
Anything made in the lab requires natural resources to produce it is the main problem with this idea.
The correct option is B.
What are some examples and resources?Anything that helps you live better and is practical is a resource. A "Resource" is any part of the natural world that is beneficial to humans, including things like oxygen, water, foods, plants, creatures, minerals, and metals.
What are the top ten natural resources?Stone, sand, metals, oil, coal, and natural gas are examples of natural resources. Other natural resources include things like air, sunlight, soil, and water. Natural resources include things like plants, fish, birds, and animals. The production of food, energy, and raw materials for the manufacture of commodities all depends on natural resources.
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The complete question is -
A student states that natural resources could be saved if people made everything they need in labs. What is the main problem with this idea?(1 point)
a-The materials made in labs will still pollute the environment and destroy natural resources.
b-Anything made in the lab requires natural resources to produce it.
c-There are not enough synthetic resources yet to make what people need.
d-People might think it is fine to waste a lot of the materials since they just came from a lab.
While David was riding his bike around the circular cul-de-sac by his house, he wondered if the constant circular motion was having any effect on his tires. What would be the best way for David to investigate this?
A.
Have someone videotape him riding and look for changes in the tires' performance.
B.
Time how long it takes him to ride 5 laps around his cul-de-sac.
C.
Measure the total distance traveled on his bike and divide this by how long it took him.
D.
Measure the wear on his treads before and after riding a certain numbe
Calculate the number of atoms of 13.555 g Pt
Answer:
4.1843 x 10²² atoms Pt
Explanation:
To find the number of platinum (Pt) atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 5 sig figs to match the amount of sig figs in the given value (13.555).
(Step 1)
Atomic Mass (Pt): 195.08 g/mol
13.555 grams Pt 1 mole
--------------------------- x ------------------------- = 0.069484 moles Pt
195.08 grams
(Step 2)
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
0.069484 moles Pt 6.022 x 10²³ atoms
--------------------------------- x --------------------------------- = 4.1843 x 10²² atoms Pt
1 mole
Convert 355 kJ to Cal
C.E.R.: How Could the continents moved apart?
As the seafloor grows wider, the continents on opposite sides of the ridge move away from each other.
