The wavelength of an electron moving with a velocity of 2.05×10^7 ms^−1 is 3.55×10^−11 m.
What is de Broglie wavelength ?
In accordance with wave-particle duality, all quantum mechanical objects exhibit the De Broglie wavelength, which establishes the probability density of discovering the object at a specific location in the configuration space.
The de-Broglie equation can be used to determine an electron's wavelength.
λ= h/mv
= 6.626×10^−34 Js / 9.11×10 ^−31 kg×2.05×10^7 m/s
=3.55×10^−11 m
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Question:
Calculate the wavelength of an electron moving with a velocity of 2.05×10^7 ms^−1.
Which of the following are mixtures?
What is the pressure of 0.540 mol of an ideal gas at 35.5 L and 223k
The pressure of 0.540 mol of an ideal gas at 35.5 L and 223K is 0.278atm.
How to calculate pressure?The pressure of an ideal gas can be calculated by using the ideal gas law equation as follows:
PV = nRT
Where;
P = pressureV = volumen = no of molesR = gas law constantT = temperatureAccording to this question, 0.540 moles of an ideal gas contains a volume of 35.5 L and a temperature of 223K. The pressure can be calculated as follows:
P × 35.5 = 0.540 × 0.0821 × 223
35.5P = 9.886
P = 0.278atm
Therefore, the pressure of 0.540 mol of an ideal gas at 35.5 L and 223K is 0.278atm.
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What is the number of C atoms in 0.247 mol of C.
The number of C atoms in 0.247 mol of C is 1.48 X 10²³ .
The number of C atoms in 1 mol of C is 6.02 X 10²³, which is also called Avogadro’s number .
so, The number of C atoms in 0.247 mol of C is _
0.247x6.02x10²³= 1.48 X 10²³.
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7. A bottle found on a shelf contains either ethanol (density 0.789g/mL) or antifreeze (ethylene
glycol density 1.11g/mL). All you have available to measure volume is a measuring cup showing
ounces. You perform the following experiment in the pictures in Fig 7. Given that 1mL= 0.0338 fl
oz. Calculate the density of the substance and identify what it is. Must show your work/setup for credit
The substance is ethylene glycol.
What is density?The term density is the ratio of mass to volume. We have two substances here which are ethanol and ethylene glycol. We have the mass of the solution as shown in the image in question 7 in the attachment to the question.
Mass of the solution = 381 - 250 = 131 g
Volume of the solution = 4 fl oz
1mL= 0.0338 fl
x = 4 fl oz
x =4 fl oz* 1mL/0.0338 fl oz
x = 118.34 mL
Density = mass/volume = 131 g/118.34 mL = 1.11 g/mL
The substance is ethylene glycol.
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What law says the total amount of
substance at the beginning of a
reaction must match the amount of
substance at the end of the reaction?
A. Law of Conservation of Energy
B. Law of Conservation of Moles
C. Law of Conservation of Heat
D. Law of Conservation of Mass
Answer:
d) law of conservation of mass
Explanation:
A person is told to take 1.25 mg of vitamin D daily. How many 0.250 mg tablets should this person take
5 tablets must be taken by the patient each day.
In a randomized clinical experiment with nursing home residents, the effects of equal oral vitamin D3 doses of 600 IU/day, 4200 IU/week, and 18,000 IU/month on vitamin D status were compared. The most efficient dosage was a daily dose, followed by a weekly dose and a monthly dose. It is believed that vitamin D status is affected equally by equivalent daily, weekly, or monthly doses of vitamin D3. A randomized clinical experiment including nursing home residents looked at this.
we know that for 1 day we need to divide 1.25 by 0.250
so, the answer will be 5 pills per day.
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In an experiment ,25 ml of 3.7 molal of HCl, HCl solution has density of 1.20 g/ml and react with 10 g zinc to form zinc chloride and hydrogen gas was liberated.
a)Determine the molarity of HCl.
b) the percentage yield if 10.35 g of zinc chloride was obtained
a) 3.04 M
b) 11.5%
In an experiment ,25 ml of 3.7 molal of HCl, HCl solution has density of 1.20 g/ml and react with 10 g zinc to form zinc chloride and hydrogen gas was liberated.
From the above statement we have got a eqauation
Zn+2HCl → ZnCL2+H2
now from the equation , we have found that
2 moles of HCl gives 1 mole of zinc chloride
now:
a) the molarity of HCl.
Here the density given, from it we can find the volume of HCl solution
d=m/v
v=m/d
v=36.5/1.20 = 30.4 ml
from the formula
M1V1=M2V2
here M stands for Molarity and V stands for Volume
M1=3.7M V1 = 25ml
M2 = ? V2 = 30.4 ml
Now put all the values in equation
M2 = M1×V1 ÷V2
M2 = 3.7×25÷30.4
M2 = 3.04 M
b) he percentage yield if 10.35 g of zinc chloride was obtained
now, from the above equation we know 2 moles of HCl gives 1 mole of zinc chloride
then,
% yield of ZnCL2 = [tex]\frac{given mass }{molecular mass}[/tex] × 100
now puttin the values
% yield of ZnCL2 = 10.35×100÷100.9
% yield of ZnCL2=11.5%
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PLEASE HELP ME I AM STRUGGLING SO BADLY ACELLUS
What is the energy of an orange lamp with a frequency of 5.10 x 10^14 Hz
? X 10^? <----- ANSWER LIKE THAN PLEASE
I just need the coefficient
Answer:
5.88235.10-7
Explanation:
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The the energy of orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 3.40×10⁻¹⁹J.
What is electromagnetic wave?
Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hv
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
v is the frequency of electromagnetic wave =5.10 x 10^14 Hz
Substituting the given values
E= 6.67×10⁻³⁴js×5.10 x 10^14 Hz
E= 3.40×10⁻¹⁹J
Therefore, the energy of orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 3.40×10⁻¹⁹J.
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Alison mixes baking soda and vinegar in a clear glass container. She places a blue balloon over the mouth of the container. Which condition tells Alison that a chemical change is taking place?
The balloon fills and expands.
The mixture is cloudy in appearance.
The balloon gets lighter blue as it expands.
The container holds a mixture of a solid and liquid.
Answer:
The balloon fills and expands.
Explanation:
The balloon expands because of the carbon dioxide being made by the mixture. That's the chemical reaction.
please help with question
give the answer in correct scientific notation with the correct number of significant figures
How many atoms are in 35.9 g of sodium sulfate (Na2SO4)?
Answer:
number of moles of NaSO4 = [tex]\frac{mass of compound}{molar mass of compound}[/tex]
= [tex]\frac{35.9}{2(23) + 32 + 4(16)}[/tex]
= 0.253 mol (3 s.f.)
0.253 mol = [tex]\frac{number of atoms}{avogadro's number}[/tex]
= [tex]\frac{number of atoms}{6.02(10^{23} )}[/tex]
thus, the number of atoms = 0.253 x [tex]6.02(10^{23})[/tex]
= 1.52 × [tex]10^{23}[/tex]
ASHTON WANTS TO FIND THE VOLUME OF A BLOCK OF WOOD
Explanation:
need help in a question u stuck in??
How many particles are in 64 grams of Oxygen?
Answer:
4
Explanation:
oxygen has molar mass of 16 g/mol. 64 grams / 16 g/mol = 4mol
A structural model of adrenaline is shown below. How many hydrogen atoms
are in adrenaline?
О A. 16
B. 3
О с. 13
D. 4
ОН
pre
ОН
НО
The number of hydrogen atoms in a molecule of adrenaline is 13 (option C).
What is adrenaline?Adrenaline is a hormone naturally produced in human body, however, it is a chemical compound made up of atoms of different elements.
The elements that make up a molecule of adrenaline are as follows:
CarbonHydrogenOxygenNitrogenAccording to this question, a structural configuration of adrenaline is attached. The number of atoms of the elemental constituent of adrenaline is given below:
9 Carbon atoms 3 Oxygen atoms1 Nitrogen atoms13 Hydrogen atomsTherefore, the number of hydrogen atoms in a molecule of adrenaline is 13.
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PLS HELP ASAP
(50 POINTS)
What is the chemical formula for ethanol according to this
illustration?
Answer: The answer is D [tex]C_{2} OH_{6}[/tex]
Explanation: Because I just know by counting the letters to see how many of each one.
Answer:
C2OH6
Explanation:
The figure shows the presence of...
Two Carbon (C)
One Oxygen (O)
and Six Hydrogen (H)
We need to make sure we select the option that best represents all of the elements shown in the figure.
Because option 4: C2OH6 is the only chemical formula to include all the elements displayed, it is the best answer.
Belching (burping) cows give off much of the methane, a greenhouse gas, from raising farm animals. Now researchers are investigating a way to reduce the greenhouse gas that is burped by cows.
In one study, scientists fed a group of dairy calves (which are cows that produce milk) a methane-blocker chemical. Sensors at feeding stations measured methane in the cows’ gas while the animals were nearby. That allowed the team of researchers to estimate the methane being belched (burped) out each day.
Over their first year of life, the treated cows, which received the methane-blocker chemical, released about ten percent less methane than the group of cows not given the chemical.
What can you infer or conclude based on the evidence from the passage?
*Your response should include the evidence to support your conclusion.
Cows and other ruminants are significant producers of the greenhouse gas methane—contributing 37 percent of the methane emissions resulting from human activity.
What is greenhouse gas?Greenhouse gases (also known as GHGs) are gases in the earth's atmosphere that trap heat. During the day, the sun shines through the atmosphere, warming the earth's surface. At night, earth's surface cools, releasing heat back into the air. But some of the heat is trapped by the greenhouse gases in the atmosphere.
While carbon dioxide is typically painted as the bad boy of greenhouse gases, methane is roughly 30 times more potent as a heat-trapping gas. As temperatures rise, the relative increase of methane emissions will outpace that of carbon dioxide from these sources, the researchers report.
The cow's ramen is like a large fermentation vat. More than 200 different bacteria and 20 types of protozoa help the cow to utilize fibrous feed stuffs and non-protein nitrogen sources. Bacteria adhere to the feed and gradually digest the fermentable material.“You can probably reduce methane by about 20-25% by altering diet,” he says.
One study by researchers at the University of California, Davis, estimated it might be possible to reduce global methane emissions from cows by 15% by changing their diet.
Thus, this evidence support the passage.
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What is reduced in the reaction below?
2H₂ + O2 → 2H₂O
O A. H₂
OB. H₂0
O C. 0₂
OD. Reduction does not occur.
Answer:
C. O2Explanation:
explaination is in attachment.
matter and energy lab report (iced tea debate) (the salty soup debate)
1. What phrase changes did you observe?
2. What kinds of energy transfers did you notice in each scenario?
3. Identify an example of matter and energy conservation in the world around you.
The questions regarding matter and energy lab report (iced tea debate) (the salty soup debate) are answered below.
1. What phrase changes did you observe?
The liquid tea is transformed into a solid. This demonstrates that when the status of the tea is altered, no matter is lost.
The water in the soup evaporates and is converted to vapor in the lab's salty soup.
2. What kinds of energy transfers did you notice in each scenario?
In each of the cases, I observed an electrical unit transferring energy.
3. Identify an example of matter and energy conservation in the world around you.
The table is an illustration of the matter. The act of turning off the lights is an example of energy conservation.
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Claire made the diagram above to show how the puddle she saw on the way to school disappeared
by the end of the day. She wanted to show her idea that heat from the sun caused the water to
evaporate into the air. However, Claire's diagram is incomplete.
Think about what's missing. What would you add to the diagram to better show Claire's idea?
Another arrow showing the heat coming from the sun will compete the diagram.
What is missing?We know that evaporation occurs when the molecules that are at the surface of the liquid receive sufficient energy to escape from the attractive forces of the other molecules in the liquid.
We can see from the diagram that the molecules of water are moving upwards. The question now is, why are the molecules evaporating? The molecules of water are evaporating because of the heat from the sun thus another arrow showing the heat coming from the sun will compete the diagram.
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Please and thank you
Answer:28, 34, 85, 6.6
Explanation:
What phase of matter is shown here
Answer:
air
Explanation:
Plan an investigation to explore the relationship between properties of substances and
the electrical forces within those substances.
Approximately 50 minutes
I
What can properties of substances tell us about the electrical forces within those
substances?
In this activity, you will plan and conduct an investigation to compare a single property
across several substances. You must select a measurable property, such as boiling point
or surface tension. After your investigation, you will compare the results and use your
data to make inferences about the strength of the electrical forces in each substance you
tested.
The physical and chemical properties of a compound is dependent upon its bond strength. Physical properties such as boiling, melting point etc . increases with bond strength. Solubility decreases with increase in bond strength.
What is bond strength?The bond strength of a molecule or compound is the measure the energy to break or form the bond. That it tells how much strong the bond is. It directly proportional to the bond order.
Boiling point of a compound is the temperature at which the compound changes from liquid to gas state. Melting point is the temperature at which a to liquid form. All these phase changes are dependent on the electrical force within the molecules.
As the electrostatic force of attraction increases, more energy have to be applied to it to weaken the bonds and make the molecules apart. Therefore, the boiling point and melting point increases.
Similarly the molecules with higher bond strength have less solubility at normal conditions. The reactivity of molecules decreases as their bond strength increases since more energy needed to break the bonds.
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voodoo money voodoo money voodoo money?
Answer:
voodoo voodoo voodoo
What is capillary action? Describe how capillary action shown by water is useful for plants and animals on Earth.
Answer:
Capillary action :-the movement of liquid along a surface of a solid caused by the attraction of molecules of the liquid to the molecules of the solid
Capillaries/xylem:- narrow pipes take the water drops up through the roots of the tree
Transpiration pull :-helps to get water to the top of the tree
The ____ chemist would study how fast nitrogen and hydrogen form
Answer:
The Bio chemist would study how fast nitrogen and hydrogen form ammonia.
Explanation:
Convert the following temperature to kelvin:a) 113°C, the melting point of sulfur,b) 37°C, the normal body temperature,c) 357°C, the boiling point mercury.
The temperature to kelvin at 113°C is 386.15 K, at 37°C is 310.15 K and at 357°C is 630.15 K.
Equation :To find Kelvin use formula,
Kelvin = 273.15 + degree Celsius
So,
(a) The melting point of sulfur at 113 degree Celsius
273.15 + 113 = 386.15 K
(b) The normal body temperature at 37 degree Celsius
273.15 + 37 = 310.15 K
(c) The boiling point of mercury at 357 degree Celsius
273.15 + 357 = 630.15 K
What is temperature?Temperature is a measure of hotness and coldness that can be expressed on a variety of scales, including Fahrenheit and Celsius. Temperature indicates the direction in which heat energy will flow from a hot body to a colder body to a lower temperature.
The total energy of the molecular motion inside the object is represented by the heat open object. Temperature is a measure of the thermal energy or average heat of a substance's molecules.
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a gallon of iced tea contains 128 fl oz of iced tea. How many l of iced tea in the container
A gallon of iced tea containing 128 fl oz of iced tea contains 3.79 liters of the liquid.
Volume ConversionThe problem here has to do with converting from fl oz to liters.
Recall that:
1 fl oz = 29.6 mL
Thus:
128 fl oz = 29.6 x 128
= 3,788.8 mL
Also recall:
1 mL = 0.001 L
Thus:
3,788.8 L = 3,788.8 x 0.001
= 3.7888 L
In other words, a gallon of iced tea containing 128 fl oz of tea contains 3.79 liters of tea.
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Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.
In this experiment, what is the warmth of the air?
A. an independent variable
B. a constant
C. a control
D. a dependent variable
The warmth of the air in the experiment conducted by Kate is the dependent variable.
What is dependent variable?In an experiment, the dependent variable is the variable that is measured or recorded by the experimenter.
On the other hand, the independent variable is the variable that is manipulated or changed by the experimenter.
According to this question, Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.
This suggests that the warmth of the air in the experiment conducted by Kate is the dependent variable.
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Can anyone help me with this?
Answer:
Student A's Date was more precise.
Explanation: Her answers are closer together whereas student B's answers are further apart in numbers.
Which statements describe the nature of science? (Select 5)
1. Scientists engage in peer reviews to avoid bias.
2. Science is a blend of logic and innovation.
3. Scientific ideas are not durable and cannot adjust to change as new data is collected.
4. Science is not observational .
5. Science is a complex social endeavor.
6. Natural world is understandable.
7. Scientists try to remain objective.
Answer:
2
Explanation:
Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.
Peer reviews are used by scientists to ensure objectivity and reduce prejudice in their study. To create original ideas and hypotheses, scientists need both logical reasoning and creative thinking.
As scientists frequently interact, exchange ideas, and build on one another's work, it is a complex social endeavour. Understanding and making sense of the natural world is the central tenet of science.
Finally, scientists separate their personal beliefs from empirical evidence in order to stay as objective as possible in their research.
Thus, Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.
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