Millikan used specific numerical data gathered by J.J. Thomson in the oil drop experiment. Therefore, option (A) is correct.
Who is Robert Andrews Millikan?Robert Andrews Millikan was an American physicist honored with the Nobel Prize for Physics for the measurement of the elementary electric charge and the photoelectric effect.
In 1909 Millikan started a series of experiments to calculate the electric charge carried by a single electron. He obtained more accurate results in 1910 with his popular oil-drop experiment in which he replaced water with oil.
Millikan in his oil-drop experiment measured the charge on a single electron but J. J. Thomson had already determined the charge-to-mass ratio of the electron. Therefore, if one value (mass or charge) were to be discovered, the other could be determined.
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the fact that there is a high sulfur content in the coal burned in south african power plants means that the
The fact that the coal burned in South African power plants has a high Sulphur content means that the power plants: burn cleanly, with little pollution
The fact that the coal burned in South African power plants has a high Sulphur content means that the power plants: burn cleanly, with little pollution; emit high levels of radioactive pollution; are very expensive, causing the majority of the country's poor to go without electricity; contribute to acidic deposition; and are very affordable, enhancing the country's economy.
What is released during the burning of sulfur-rich coal?
Some or all of the SO2 produced when high Sulphur coal is burned in power plants is frequently discharged into the atmosphere, where it reacts with water vapour to form sulfuric acid. Acid rain is then produced when this acid reacts with water droplets.
When coal is burned, what is released in significant amounts?
All living things, including humans, are composed of carbon. However, as coal burns, its carbon reacts with airborne oxygen to generate carbon dioxide. Although carbon dioxide (CO2) is an odourless, colourless gas, it is one of numerous gases in the atmosphere that can retain the heat from the planet.
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A substance has a half-life of 2. 045 minutes. If the initial amount of the substance was 132. 8 grams, how many half-lives will have passed before the substance decays to 8. 3 grams? what is the total time of decay?.
The total time of decay is 8.18 min.
The half life is the time to takes a substance to decay. so, we half to find out the number of half lives that have passed for initial amount of 132.8 g.
number of half -lives amount of substances in g
0 132.8
1 66.4
2 33.2
3 16.6
4 8.3
so. it will take 4 half -lives for the substance to decay to 8.3 g.
the total time decay = 4 × 2.045 = 8.18 min.
Thus, A substance has a half-life of 2. 045 minutes. If the initial amount of the substance was 132. 8 grams, half - life will have passed before the substance decays to 8. 3 grams. the total time of decay is 8.18 min.
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Processes come into play during the dehydration process in an oven: question 12 options: heat, low humidity and air current heat, high humidity and air current heat, high humidity and lack of air current none of the choices are correct.
The processes that come into play during the dehydration process in an oven is option A. Heat, low humidity and air current.
What are the methods of dehydration?
Foods can be dried in a number of ways, including the sun, an electric dehydrator, a regular oven, a microwave (just for herbs), air drying, and solar drying.
Note that Food dehydration involves simultaneous mass and heat transfers within the food as well as changes in the energy transfer medium. When food is dehydrated using a process other than hot air, the moisture may need to be removed from the food by means of air or another gas.
Hence, One of the simplest methods for preserving food is dehydration. You don't need to purchase specialized jars, preservers, or equipment. Not even a dehydrator is necessary. Food can be dried in your oven, whether it's a toaster oven or a regular oven.
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Two boys, Adam and Bob are pushing a box. They want to move the box to the right. Adam exerts a force of 100 Newtons on the box and Bob exerts a force of 150 Newtons in the same direction.
A. Are the forces working in the same or opposite direction? ___________________
B. Do you add or subtract the forces? ____________________________________
C. What is the combined force (net force) on the box? ________________________
D. Are the forces balanced or unbalanced? ________________________________
A. The forces are working in the same direction.
B. The forces are additive.
C. The combined force on the box is 250 Newtons.
D. The forces are unbalanced.
Net forceThe net force on an object is the resultant force on the object when all the possible forces have been considered.
Forces that act in the same direction are additive in nature while opposing forces are subtractive.
Thus, considering the forces exerted by Adam and Bob on the box, their forces are additive because both are in the same direction. Thus, the total force applied or the combined force on the box can be calculated as;
100 + 150 = 250 Newtons.
Now, the two forces are not applied at the same point on the box and neither are they equal in magnitudes. Bob exerted more force than Adam. Thus, the forces are unbalanced.
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What mass of magnesium bromide is formed when 1 g of magnesium reacts with 5g of bromine.
The 5.76 grams of MgBr₂ produced from the reaction of bromine and magnesium.
Balanced chemical equation
Mg + Br₂ ⇒MgBr₂
Number of moles of Mg and Br₂ present
n(Mg) = 1/24.3 = 0.0412 mol
n(Br₂) = 5/159.8 = 0.0313 mol
Checking the limiting reagent in the reaction.
Magnesium and Bromine react in 1:1 ratio
Then Limiting reagent will be bromine. The values of bromine will be used to calculate amount of magnesium bromide(Molar mass =5.76g).
0.0313 x 184.1 = 5.76 grams.
Hence, 0.0313 mole of bromine will produce 5.76 grams of magnesium bromide.
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How would an increase in temperature affect evaporation?
F) it would end evaporation
G) it would speed up evaporation
H) it would slow down evaporation
J) temperature does not affect evaporation
Answer:
G) It would speed up evaporation.
Explanation:
As the temperature increases, the rate of evaporation also increases.
What is the strongest intermolecular force present for each of the following molecules?
A. hydrogen [tex]\left(\mathrm{H}_2\right)[/tex]
B. carbon monoxide (CO)
C. silicon tetrafluoride [tex]\left(\mathrm{SiF}_4\right)[/tex]
D. nitrogen tribromide [tex]\left(\mathrm{NBr}_3\right)[/tex]
E. water [tex]\left(\mathrm{H}_2 \mathrm{O}\right)[/tex]
Answer: Yes, it is true, hydrogen bonding is strongest intermolecular forces compare with all. In case of nh3, (N-H bonds makes between molecules) and dipole dipole interaction (interaction between two dipole) and london dispersion forces occur between nh3 molecules. this types of intermolecular forces are generated between nh3 molecules.
If the reaction of 150. G of ammonia with 150. G of oxygen gas yields 87. G of nitric oxide (no), what is the percent yield of this reaction?.
The percentage yield of the given reaction is 77.33%.
What is percentage yield?
Reactants frequently produce fewer product quantities than predicted by the chemical reaction's formula. The percentage of a theoretical yield that's been produced in a reaction is calculated using the percent yield formula. Working through a stoichiometry problem yields the theoretical yield, which is the ideal quantity of the final product. The actual yield is determined by calculating the volume of the product formed. We can determine the percentage yield by dividing the actual yield by the theoretical yield.
Moles is calculated by using the formula:
Moles of Ammonia:
Given mass of ammonia = 150g
Molar mass of ammonia = 17 g/mol
Putting values in above equation, we get:
Moles of Oxygen
Given mass of oxygen = 150g
Molar mass of oxygen = 32 g/mol
Putting values in above equation, we get:
For the given chemical equation:
By Stoichiometry,
5 moles of oxygen reacts with 4 moles of ammonia.
So, 4.6875 moles of oxygen will react with = of ammonia
As, moles of ammonia required is less than the calculated moles. Hence, ammonia is present in excess and is termed as excess reagent.
Therefore, oxygen is considered as a limiting reagent because it limits the formation of products.
By Stoichiometry of the given reaction:
5 moles of oxygen gas produces 4 moles of nitric oxide
So, 4.6875 moles of oxygen gas will produce = of nitric oxide
Now, to calculate the theoretical amount of nitric oxide, we use equation 1: Molar mass of nitric oxide = 30 g/mol
Given mass of nitric oxide = 112.5 g
Now, to calculate the percentage yield, we use the formula:
Experimental yield = 87 g
Theoretical yield = 112.5 g
Putting values in above equation, we get:
Hence, the percentage yield of the given reaction is 77.33%.
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patterns of reactivity quick check
Reactivity decreases as you move from left to right. The farther to the left and down the periodic chart you move, easier it is for electrons to be given or taken away, hence resulting in higher reactivity.
What is the pattern of reactivity in periodic table?Reactivity decreases as we move down the column. As you learn more about the table, you will be able to find that this pattern is true for other families.
The atoms get bigger, as the atomic number increases. The chemical properties change slightly when compared to the element right above them on the table. The non-metal elements in Group 7 that are known as the halogens, get less reactive as you move to the down of the group.
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Radio wave in the AM region have frequencie in the rang 539 to 1700 kilocycle per econd (530 to 1700 KHz). Calculate the wavelength correponding to a radio wave of grequncy 1460000/ (that i 1460 KHz)
The wavelength is 241.77m.
What is frequency?
Hertz gives the frequency at which a recurring event occurs once every second (Hz). The number of vibrations or cycles per unit of time is the definition of frequency, as we are all aware.
What is wavelength?
A wave's wavelength is the separation between its successive crests, notably between the points of an electromagnetic wave.
frequency = 1.240*10^6 s^-1
speed of light = 2.998*10^-8 m/s
λ = wavelength
C= λv
λ=c/v
λ= 2.998*10^-8 m/s/1.240*10^6 s^-1
λ= 241.77m
Therefore, wavelength is 241.77m.
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show between force pressure and area
Answer:
Relationship: The Pressure on an Area and the Force Acting Perpendicularly to the Area. The pressure, , on an area, , is given by = , where is the force acting perpendicularly to all the sides of the area
Produces pyruvate. The multienzyme complex catalyzes the oxidative of pyruvate to yield carbon dioxide and acetyl coa. The overall equation for the reaction is acetyl coa is the main form in which carbon compounds enter the.
Pyruvate is produced by the reaction of a glycolysis. The multienzyme complex catalyzes the oxidative of pyruvate to yield carbon dioxide and acetyl coa. Its reaction is given as
Pyruvate+CoA+NAD⁺→acetyl CoA+NADH+H⁺+CO₂
Acetyl CoA→Citric acid cycle
Glycolysis process is defined as the conversion of a glucose(C₆H₁₂O₆) into the pyruvate(CH₃COCO₂H). In the glycolysis reaction, high energy ATP molecules and reduced nicotinamide adenine dinucleotide is created. The series of ten enzyme-catalyzed process makes up glycolysis.
One of the metabolic route which does not require is glycolysis(In anaerobic conditon, pyruvate is converted to lactic acid). It is occurred in various species, which tells us that it is old metabolic route.
Therefore, the glycolysis reaction produces pyruvate and its complete reaction is
Pyruvate+CoA+NAD⁺→acetyl CoA+NADH+H⁺+CO₂
Acetyl CoA→Citric acid cycle
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