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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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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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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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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Which of the following types of infiltration techniques does one open up to by posting sensitive personal information and details about one's workplace on social networking sites? Password theft Social engineering Physical threats Phishing Virus infections
Social engineering types of infiltration techniques does one open up to by posting sensitive personal information and details about one's workplace on social networking sites.
What is the which means social engineering?
Social engineering is an assault vector that is predicated closely on human interplay and frequently includes manipulating human beings into breaking regular safety techniques and satisfactory practices to benefit unauthorized get entry to systems, networks or bodily places or for economic benefit.
Is social engineering a cybercrime?
Social engineering is a manipulation approach that exploits human blunders to benefit personal information, get right of entry to, or valuables. In cybercrime, these “human hacking” scams generally tend to trap unsuspecting customers into exposing data, spreading malware infections, or giving get right of entry to constrained systems.
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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
how might a natural disaster such as a forest fire affect the elements of the hydrosphere
Answer:
A fire could cause an increase in evaporation of water from surface water near the fire.
Explanation:
Answer:
Explanation:
Wildfires can compromise water quality both during active burning and for months and years after the fire has been extinguished. Burned watersheds are prone to increased flooding and erosion, which can negatively affect water-supply reservoirs, water quality, and drinking-water treatment processes.
Wildfires can have immediate and long term effects on rivers, lakes, and streams. After burning vegetation, the ground's soil becomes hydrophobic and is unable to absorb any water. This creates what is known as stormwater runoff. Stormwater runoff is rainflow that travels over the surface of the ground.
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enthalpy of neutralization to be the most similar to that of sodium hydroxide with hydrochloric acid
Acids include hydrochloric acid (HCl) and bases include sodium hydroxide (NaOH). As a result, when they combine, they have a neutralization reaction that produces water and sodium chloride.
What happens in neutralization?The pH rises to about 7 as a result of neutralization, which happens when a base and a base combine. It is a useful technique that is applied in daily life, for example when lime is added to acid soils to treat and relieve indigestion. Furthermore, neutralization results in an alkali's pH dropping to about seven.
Why does neutralization take place?Taking a base balances out our stomach's excess acid. Due to the formic acid in the ant sting, it can be painful. Using wet baking soda, which really is basic in nature, we can counteract this acid impact and lessen the agony brought on by the sting.
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nh2ch2co2h lewis structure
The Lewis structure of the compound is shown in the image attached to this answer.
What is Lewis structure?We know that the Lewis structure shows us what a compound looks like. The two parts of the Lewis structure would include the symbol of the element as well as the electron dots that can be used to show the number of valence electrons. This is why we call the Lewis structire the Lewis dot structure of a compound.
We can see that the compound here has an amine group as well as a carboxylic group and the Lewis structure would tell us the number of electron pairs that we have on the valence shell of each of the atoms.
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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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a chemistry student is given of a clear aqueous solution at . he is told an unknown amount of a certain compound is dissolved in the solution. the student allows the solution to cool to . at that point, the student sees that a precipitate has formed. he transfers the liquid to a clean new beaker and throws away the precipitate. the student then evaporates the water from the liquid in the new beaker under vacuum. it weighs . using
The Solubility cannot be calculated.
Solubility indicates the maximum amount of a substance that can be dissolved in a solvent at a certain temperature. Such a solution is called saturated. Divide the mass of the compound by the mass of the solvent and multiply by 100g to calculate the solubility in g/100g.
The solubility of ionic solutes does not always increase with increasing temperature. In exothermic solution reactions, solubility can decrease with increasing temperature. The number of moles of solute dissolved in a given volume of solution does not represent the solubility of the solution. They dissolve more readily and solubility increases with increasing temperature.
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If 3.45 l of a 0.35 m h3po4 to be diluted to a volume of 10.00 l, what is the concentration of the resulting solution
When 3.45 L of a 0.35 M H₃PO₄ to be diluted to a volume of 10.00 L, The concentration of H₃PO₄ resulted is 0.1207 M
The concentration of H₃PO₄ can be calculated as follows:
Dilution is the process of reducing the concentration of a solute in solution, usually by simply mixing the solute with more solvent by adding water to the solution.
The formula (M1V1=M2V2) represents the dilution formula in chemistry.
M1V1=M2V2
3.45 L x 0.35 M = M2 X 10.00 L
M2 = 3.45 L x 0.35 M
10.00 L
M2 = 0.1207 M
Therefore, when 3.45 L of a 0.35 M H₃PO₄ to be diluted to a volume of 10.00 L, The concentration of H₃PO₄ resulted is 0.1207 M
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BONUS: What process does this chemical reaction represent? 6CO2 + 6H2O —> C6H12O6 + 6O2
predict the major product for the reaction shown.
The product of the reaction is m-nitrobenzaldehyde, option B.
What is m-nitrobenzaldehyde?M-nitrobenzaldehyde, also known as meta-nitrobenzaldehyde is an organic aromatic compound that contains a nitro-group which is meta substituted to an aldehyde. It is soluble in water at 2.34 mg/ml and a temperature of 25° C. It is also soluble in ethanol, benzene and slightly in ether. M-nitrobenzaldehyde production process is prepared by nitration.
The carboxylic group is meta directing and has an ortho-para deactivating group therefore, during nitration of benzaldehyde, meta position gains an attachment from the nitro group forming m-nitrobenzaldehyde as product.
The full question is:
Predict the major product for the reaction shown.
a. o-cyanonitrobenzene & p-cyanonitrobenzene
b. m-nitrobenzaldehyde
c. o-cyanonitrobenzenesulphonic acid & p-cyanonitrobenzenesulphonic acid
d. m-cyanonitrobenzenesulphonic acid
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li2s lewis structure
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.
The density of gold is 19.3 g/cm3. a. What is the volume, in cubic centimeters, of a sample of gold that has a mass of 0.715 kg? b. If this sample of gold is a cube, what is the length of each edge in centimeters?
A measure of how compact matter is is what density means. How much "stuff" is crammed into an area, to put it simply.
What is Density?In science, density is defined as the ratio of an object's mass to volume. Mathematical and scientific density comparisons are done using a formula.
In disciplines, such as physics, the focus is on things and matter and relates the notion to the rules of nature.
It is a calculable and manipulable formula in mathematics. In other disciplines, such as social sciences, density relates with population. The amount of people in a specific land area produces the population density.
Therefore, A measure of how compact matter is is what density means. How much "stuff" is crammed into an area, to put it simply.
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Sodium chloride reacts with fluorine gas to produce solid sodium fluoride and chlorine gas.
The Sodium chloride reacts with fluorine gas to produce solid sodium fluoride and chlorine gas is 2Na+F₂→2NAF.
What is Sodium chloride ?
One of the most prevalent minerals on Earth and a crucial nutrient for many animals and plants is sodium chloride (NaCl), also known as salt. Seawater and underground rock formations are two natural sources of sodium chloride.
What is fluorine?
The most reactive element in all of chemistry is fluorine (F), which is also the first member of the halogen family. Both fluorides and fluorides-containing compounds, both organic and inorganic, are referred to by the terms "fluoride" and its ionic form (F-), respectively.
∴2Na+F₂→2NAF
Therefore, Sodium chloride reacts with fluorine gas to produce solid sodium fluoride and chlorine gas is 2Na+F₂→2NAF.
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how many atomic orbitals are needed to form one bonding molecular orbital and one anti-bonding molecular orbital? explain. the bonding of three incorrect: your answer is incorrect. atomic orbital(s) on two correct: your answer is correct. different atom(s) will give rise to one bonding molecular orbital and one anti-bonding molecular orbital
There are two molecular orbitals are needed to form one bonding molecular orbital and one anti-bonding molecular orbital.
Bond orbitals Electrons that spend most of their time between the nuclei of two atoms are placed in bonding orbitals, and electrons that spend most of their time outside the nuclei of two atoms are placed in anti-bonding orbitals.
Adding up the same number of atomic orbitals gives the same number of molecular orbitals. Two atomic orbitals combine to form two molecular orbitals. An anti-bonding orbital is essentially the opposite of a bonding orbital. They form when atomic orbitals combine in ways that lead to almost destructive interference.
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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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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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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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