Answer:
Exposure of silver chloride to sunlight for a long duration turns grey due to photolytic decomposition i.e decomposition in the presence of sunlight.
Explanation:
When silver chloride, AgCl is exposed to sunlight for a long time, it will undergo decomposition as the sunlight provides sufficient energy needed to decomposed the salt, AgCl to metallic silver and chlorine gas. This can be seen in the equation below:
2AgCl —> 2Ag + Cl2
if 140cm3 of methane diffuse into air in 72 sec,how long will it take 210cm3 of sulphur dioxide to diffuse under the same condition ?
Answer:
time for sulphur dioxide to diffuse is 221.05 secs
The time for sulphur dioxide to diffuse is 108 sec.
Which gas diffuses twice quickly as SO2?Sulfur dioxide has a molecular weight of sixty-four and as a result, the square root is 8. since its inversely proportional, on the way to diffuse two times as fast, the rectangular root of the molecular weight should be 4, and subsequently the molecular weight might be 16. So the solution is methane (CH4).
Which gases diffuse the fastest?The charge of diffusion for a gas is inversely proportional to the rectangular root of its molecular mass (Graham's law). The gasoline with the lowest molecular weight will effuse the fastest. The lightest, and consequently fastest, fuel is helium.
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In alcohol fermentation, yeast converts glucose to ethanol and carbon dioxide: C 6 H 12 O 6 (s)→2C 2 H 5 OH(l) + 2CO 2 (g) If 5.97 g of glucose are reacted and 1.44 L of CO 2 gas are collected at 293 K and 0.984 atm, what is the percent yield of the reaction.
Answer:
89.4%
Explanation:
We'll begin by obtaining the actual yield of CO2. This can be obtained calculating the number of mole of CO2 produced from the reaction as follow:
Volume (V) = 1.44 L
Temperature (T) = 293 K
Pressure (P) = 0.984 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =..?
PV = nRT
0.984 x 1.44 = n x 0.0821 x 293
Divide both side by 0.0821 x 293
n = (0.984 x 1.44) / (0.0821 x 293)
n = 0.059 mole
Therefore, the actual yield of CO2 is 0.059 mole.
Next we shall the theoretical yield of CO2. This can be obtained as follow:
First, we shall determine the number of mole in 5.97 g of glucose, C6H12O6.
Molar mass of C6H12O6 = (12x6) + (12x1) + (16x6) = 180 g/mol
Mass of C6H12O6 = 5.97 g
Mole of C6H12O6 =?
Mole = mass /molar mass
Mole of C6H12O6 = 5.97/180
Mole of C6H12O6 = 0.033 mole
Now, we can calculate the theoretical yield of CO2 as follow:
C6H12O6(s) → 2C2H5OH(l) + 2CO2(g)
From the balanced equation above,
1 mole of C6H12O6 produced 2 moles of CO2.
Therefore, 0.033 mole of C6H12O6 will produce = 0.033 x 2 = 0.066 mole of CO2.
Therefore, the theoretical yield of CO2 is 0.066 mole.
Finally, we shall determine the percentage of CO2 as follow:
Actual yield = 0.059 mole
Theoretical yield = 0.066 mole.
Percentage yield =?
Percentage yield = Actual yield /Theoretical yield x 100
Percentage yield = 0.059/0.066 x 100
Percentage yield = 89.4%
Therefore, the percentage yield of the reaction is 89.4%
What is the temperature in Celsius of 308 K
Answer:
35degrees celsius
308-273=35
Describe what happens to the electrons in a neon that is heated to incandescence and then when the heat energy is removed.
Answer:
Fluorescent luminaire is the assembly that forms a lamp, called a fluorescent tube, and an armature, which contains the accessories necessary for operation. In certain places, only the lamp is known as a luminaire. The lamp is low pressure mercury vapor discharge and is normally used for domestic or industrial lighting. Its advantage over other types of lamps, such as incandescent lamps, is their energy efficiency.
The lamp consists of a thin glass tube lined internally with various compound chemicals called phosphors, although they generally do not contain the chemical element phosphorus and should not be confused with it. Those chemical compounds emit visible light when receiving ultraviolet radiation. The tube also contains a small amount of mercury vapor and an inert gas, usually argon or neon, at a pressure lower than atmospheric pressure. At each end of the tube is a filament ...
Explanation:
A student combines 364.6 g of HCl with 80 g of NaOH in 5 L of water. What additional volume of H2O must be added to this mixture to yield a solution with a pH of 1? Note that the molar mass of HCl is 35.46 g/mole, while that of NaOH is 40 g/mole.
Answer:
75L of additional water to have a pH 1 solution
Explanation:
The reaction of HCl With NaOH is:
HCl + NaOH → H₂O + NaCl
By using molar mass of each reactant you can know how many moles will react, thus:
HCl: 364.6g HCl ₓ (1mol / 36.46g) = 10 moles HCl
NaOH: 80g NaOH ₓ (1mol / 40g) = 2 moles NaOH
That means after the reaction will remain in solution, 10-2 = 8 moles of HCl = 8 moles of H⁺ (In water, HCl dissociates as H⁺ and Cl⁻ ions).
A solution with pH = 1 contains:
pH = -log [H⁺]
1 = -log [H⁺]
0.1M = [H⁺]
As molarity, M is the ratio between moles and liters and you want a solution 0.1M having 8 moles of H⁺ you require:
0.1M = 8 moles H⁺ / 80L
As the student combines the solution with 5L of water, you require
75L of additional water to have a pH 1 solutionHow do you find the amount of electrons for any element?
Answer:
If you know the number of protons and neutrons you have to simply subtract the number of neutrons by number of protons the answer will be number of neutron
Explanation:
Answer:
We can find the amount of electrons through its Atomic number and with the help of electronic configuration
Consider the equation below.
Zn + H2SO4 → ZnSO4 + H2
The mole ratio of zinc to zinc sulfate is
Answer:
1:1
Explanation:
There is one mole of zinc (Zn) and one mole of zinc sulfate (ZnSO₄).
The mole ratio is 1:1.
Hope this helps.
Answer:
1:1
Explanation:
Research how different fossil fuels compare in terms of the amount of carbon dioxide released per kWh of energy. How much carbon dioxide is produced by burning a gallon of gasoline? A gallon of diesel?
Answer:
About 19.64 pounds of carbon dioxide are produced from burning a gallon of gasoline. On the other hand, 22.38 pounds of carbon dioxide are produced from burning a gallon of diesel. So, different fossil fuels will give different amounts of carbon dioxide to be released.
Explanation:
what is the symbol of iron
Answer:
the symbol of an iron is Fe (ferous, feric).
When Coach Kwan notices that a player is getting tired, she takes out the tired player and substitutes a fresh player. Which type of chemical reaction does this best model?
Answer: Single replacement Reaction
Explanation:
A replacement reaction is a chemical reaction in which an element replaces another element in a compound especially when it is more reactive than the former. There are two types of replacement reaction, the single and double replacement reaction.
In the former, one element which is usually more reactive than the other replaces it . For example in the single replacement, a more reactive metal replaces a less reactive metal and also a more reactive non metal can replace a less reactive non metal.
A + BC → B + AC
looking at the equation aove, you can see that B replaces A
Also In double replacement, the elements in the both reacting compounds are replaced or exchanged to form new compounds as can be illustrated in the equation
AB + CD —— AC + BD
In the case of Coach Kwan, she follows the Single replacement model as she substitutes a less active and tired player with an active one.
Answer:
This represents the single replacement model
A.)
Explanation:
The Coach replaced the tired player just like in a chemical reaction.
A bauxite mining company has got government permission to acquire agricultural land in a location to start surface mining activities. Which of these is the best plan to solve the problem of permanent dislocation of farmers due to mining in the location?
Answer:
make reclamation compulsory after bauxite has been removed
Explanation:
Available options:
choose other infertile and uninhabited locations for bauxite mining
allow agriculture and mining to take place simultaneously in the location
ask farmers in the location to help in mining bauxite
make reclamation compulsory after bauxite has been removed
The correct option and the best plan to solve the problem of permanent dislocation of farmers would be to make reclamation compulsory after the bauxite has been removed.
Reclamation would involve restoring the agricultural land back to its original status prior to the commencement of bauxite mining. By doing this, the farmers can return to their farmland after being temporarily displaced due to the mining activities.
answer is b
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(BRAINIEST FOR QUICKEST)
Describe two safety precautions you should take when handling a flammable liquid.
Answer:
Goggles
Tie hair back
Explanation:
Can I have brainliest
Answer:
goggles and gloves
Explanation:
What is the overall reaction equation?
it
NH3(g)+--CH,() ~3H2(g) +- HCN(G)
2
NH3(g)+CH_(g) →6H 2(9)+ HCN(g)
NH3(9)+CH_(g) → 3H2(g) + HCN(9)
DONE
6 of 21
The question's reaction is represented by the chemical equation NH3(g) + CH4(g) 3H2(g) + HCN (g).
What impact does temperature have on the equilibrium reaction N2 3 H2 N3?Ammonia is created through an exothermic process. When the temperature rises, the reaction changes direction in order to cancel out the effect of the rise in temperature.
Why is the following oxidation process, CH4 2O2 CO2 2H2O, an example of one?Fuel is oxidised in this reaction by combining with oxygen, which releases energy (often in the form of light and heat) as well as the creation of carbon dioxide and water (H 2 O). Consider this: Carbon dioxide is produced as a result of methane and oxygen reacting.
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Which of the following elements is a liquid at room temperature? A. Bromine (Br) B. Carbon (C) C. Calcium (Ca) D. Helium (He)
Answer:
A. Bromine
Explanation:
Bromine exists as a liquid at room temperature simply because there is more attractive force between its molecules than between those of fluorine or chlorine.
Need help ASAP!!!! what is the value (angle) for the C=C=O bond in Ketene i.e. CH2=C=O
Answer:
[tex]180^\circ[/tex] by the VSEPR theory.
Explanation:
This question is asking for the bond angle of the [tex]\rm C=C=O[/tex] bond in [tex]\rm H_2C=C=O[/tex]. The VSEPR (valence shell electron pair repulsion) theory could help. Start by considering: how many electron domains are there on the carbon atom between these two bond?
Note that "electron domains" refer to covalent bonds and lone pairs collectively.
Each nonbonding pair (lone pair) of valence electrons counts as one electron domain.Each covalent bond (single bond, double bond, or triple bond) counts as exactly one electron domain.For example, in [tex]\rm H_2C=C=O[/tex], the carbon atom at the center of that [tex]\rm C=C=O[/tex] bond has two electron domains:
This carbon atom has two double bonds: one [tex]\rm C=C[/tex] bond and one [tex]\rm C=O[/tex] bond. Even though these are both double bonds, in VSEPR theory, each of them count only as one electron domain. Keep in mind that there are only four valence electrons in each carbon atom. It can be shown that all four valence electrons of this carbon atom are involved in bonding (two in each of the two double bonds.) Hence, there would be no nonbonding pair around this atom.In VSEPR theory, electron domains around an atom repel each other. As a result, they would spread out (in three dimensions) as far away from each other as possible. When there are only two electron domains around an atom, the two electron domains would form a straight line- with one domain on each side of the central atom. (To visualize, consider the three atoms in this [tex]\rm C=C=O[/tex] bond as three spheres on a stick. The central [tex]\rm C[/tex] atom would be between the other [tex]\rm C[/tex] atom and the [tex]\rm O[/tex] atom.)
This linear geometry corresponds to a bond angle of [tex]180^\circ[/tex].
what happens to the concentration of a product over the course of a reaction
Answer:
it becomes poisonous to the body
What is the theoretical yield of butan-2-one (shown) if 0.30 mL of butan-2-ol is treated with TEMPO and an excess of of TCCA and is completely oxidized? Your answer should be in grams and give only the number. Your answer should have at least 2 significant digits (2nd decimal place).
Answer:
Theoretical yield = 0.24 gram (Approx)
Explanation:
Given:
Butan-2-1
Molar mass(butan-2-ol) = 74.12 g/mol
Molar mass(butan-2-one) = 72.11 g/mol
Density of butan = 0.806 g/mol
Volume = 0.30 ml
Computation:
Mass of 2-butan = Density of butan × volume
Mass of 2-butan = 0.806 g/mol × 0.30 ml
Mass of 2-butan = 0.2418 g
Mass of product = Mass of 2-butan × [1 mol of butan-2-ol / 74.12] × [1 mol of butan-2-one / 1 mol of butan-2-ol] × [72.11 g/mol / 1 mol of butan-2-one]
Mass of product = 0.235 gram
Theoretical yield = 0.24 gram (Approx)
(PLEASE HELP, LAST QUESTION I NEED! ) Describe to me the purpose of stoichiometry calculations.
Explanation:
Stoichiometry measures these quantitative relationships, and is used to determine the amount of products and reactants that are produced or needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry.
Explain why there would be an environmental problem if the gas from Cu2S + O2 → CuO + SO2 were allowed to escape into the atmosphere.
Answer:
SO2 gas leads to acid rain
Explanation:
If we consider the reaction; Cu2S + 2O2 → 2CuO + SO2 we will notice that SO2 gas is produced. The release of SO2 gas into the atmosphere leads to acid rain or acid precipitation. Acid rain refers to a drop in the pH of rain water because it has dissolved acidic gases in the atmosphere such as sulphur dioxide. These acid gases are also known as acid anhydrides.
Acid rain is known to lead to the corrosion of roofing sheets, rise in the pH of terrestrial water bodies which threatens the survival of aquatic organisms, leaching of important soil nutrients and decline in the aesthetic appeal of statues and monuments.
Hence the sulphur dioxide produced in this reaction should be prevented from escaping into the atmosphere to avoid the formation of acid rain with its attendant deleterious consequences as listed above.
5. For which of the following reactions would the heat of reaction be labelled ∆Hf°? a) PCl3 + ½ O2(g) ->POCl3(g) b) CaO(s) + SO2(g) -> CaSO3(s) c) Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s) d) ½ N2O(g) + 1/4 O2(g) -> NO(g)
Answer:
C
Explanation:
∆H°f means the enthalpy change of formation of one mole of substance by its constituent elements under standard conditions.
So in an equation for ∆H°f, we must see 2 or more elements as reactants combining to form a compound.
In the 4 answers, only C represents elements forming a substance (Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s)),
while the others include compounds as one of their reactants.
The reaction Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s) can be labeled as standard enthalpy of formation (∆Hf°).
In chemistry, the standard enthalpy of formation refers to the heat evolved or absorbed when a substance is formed from its constituent elements under standard conditions.
As such, we can see that the compound Al(OH)3(s) in option C was formed from its components; aluminium, oxygen and hydrogen therefore, the reaction Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s) can be labeled as standard enthalpy of formation (∆Hf°).
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How are the properties of metals and non-metals different?
Answer:
Explanation:
Properties of metals:
1. They have a lustre ( shine )
2. They have a silvery-grey or golden-yellow colour.
3. They conduct heat and electricity.
4. They are ductile ( can be drawn into wires ) .
5.They are malleable ( can be hammered into thin sheets ).
6. They are sonorous ( make a ringing sound when hit ).
Properties of non-metals:
1. They display a variety of colours.
2. They are poor conductors of heat and electricity.
3. They are not lustrous, ductile or malleable.
Hope it helps
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Which statements about light are true? Select all the correct answers A.It can travel through empty space B.It has no mass C.It has moving electrons D.It's made of moving electric and magnetic fields God bless everyone
Answer:
A. It can travel through empty space
Explanation:
Unlike sound it light can travel at an empty space or vacuum.
Hope it helps <3 and Amen.
Answer:
the answer on plato / edmentum is A B and D
Explanation:
hope this helps <3
help me solve this density question
Answer:
1.03 grams / mL
Explanation:
Mass of beaker and sample liquid = 84.64
Mass of beaker = 32.344
Mass of the sample (subtract) = 52.296
Don't do any rounding until you are finished.
mass = 52.296 grams
volume = 50.6 mL
density = mass / volume
density = 52.296/50.6
density = 1.034 grams / mL
Rounding
The volume only has 3 dig digs
So the answer is 1.03 grams / mL
Which are characteristics of a prokaryotic cell? Select three options. contains DNA lacks DNA contains ribosomes lacks ribosomes contains a nucleus lacks a nucleus
Answer:
Prokaryotic cells contain DNA, contain ribosomes, and lack a nucleus.
Answer:
Contains DNA
Contains Ribosomes
lacks a nucleus
Explanation: I took the quiz on edge
Determine the net iconic equation for the following chemical reaction: HCl(aq) + NH4OH(aq)———-> NH4Cl(aq) + H2O(I) Hint: HCl(aq) is strong acid NH4OH(aq) is a weak base
Answer : The net ionic equation will be,
[tex]H^{+}(aq)+OH^{-}(aq)\rightarrow H_2O(l)[/tex]
Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The given balanced ionic equation will be,
[tex]HCl(aq)+NH_4OH(aq)\rightarrow NH_4Cl(aq)+H_2O(l)[/tex]
The ionic equation in separated aqueous solution will be,
[tex]H^+(aq)+Cl^-(aq)+NH_4^+(aq)+OH^-(aq)\rightarrow H_2O(l)+NH_4^+(aq)+Cl^-(aq)[/tex]
In this equation, [tex]NH_4^+\text{ and }Cl^-[/tex] are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
[tex]H^{+}(aq)+OH^{-}(aq)\rightarrow H_2O(l)[/tex]
What is the identity of a substance
Answer:
Typically, the identity of a substance can be described by a: chemical name, for example, benzene; number, for example, EC number 200-753-7, and. chemical composition, for example, >99 % benzene and <1 % toluene.
Explanation:
Typically, the identity of a substance can be described as a: chemical name, for example, benzene chemical composition, for example, >99% benzene and <1% toluene. The composition is determined by chemical analysis.
I hope this helps.
What do all the theories in the table have in common?
Answer:
can you please post the table. can't answer otherwise
Explanation:
Answer:
They all explain how or why a certain phenomenon occurs.
Explanation:
first ionization energy
Answer:
The first ionization energy is defined as
Energy which is required to pull out one mole of the outermost shell's electrons in a neutral atom from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+.[tex]A\to A^++ e^{-}[/tex] , where A is any neutral atom.In the periodic table, Its value decreases from top to bottom in groups and increases from left to right across a particular period. Helium has the largest first ionization energy.Francium has one of the lowest.Name one way chemicals can help the environment
Energy storage and transport. Chemical energy transport.
Answer:
to clean the water
Explanation:
4.Acrylic fibres are also known as
a)Terry cot
b)Orlon
c)Polyester
d)None of these
Answer:
B
Explanation:
DuPont created the first acrylic fibers in 1941 and trademarked them under the name Orlon.