The observation that at equilibrium, the reaction quotient equals the equilibrium constant, is representative law of mass action.
The law of mass action is that the rate of reaction is directly proportional to the product of the concentrations of the each reactant. The equilibrium constant is represented as Kc.
let us take the example :
A + B ⇄ C + D
Kc = ( [C] [D] ) / [ A ] [B] )
at equilibrium , Kc = Qc
Reaction Quotient , Qc = ( [C] [D] ) / [ A ] [B] )
Thus, The observation that at equilibrium, the reaction quotient equals the equilibrium constant, is representative law of mass action.
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which of the following is false? hydration of alkynes with h3o typically requires a mercury catalyst. acid-catalyzed hydration of terminal alkynes affords anti-markovnikov products. acid-catalyzed hydration of terminal alkynes affords ketone products. in the acid-catalyzed hydration of alkynes, an enol intermediate is formed.
Hydration of alkynes with h3o typically requires a mercury catalyst is a false statement.
What is hydration of alkynes?Alkynes are first hydrated by the addition of the first water molecule. But this initial hydration event results in the formation of an enol, an alcohol joined to a vinyl carbon.
Enols instantly go through a particular kind of isomerization process termed tautomerization to create carbonyl groups, such as aldehydes or ketones. With the understanding that aldehydes occur on terminal alkyne carbons, this reaction is referred to as "enol-keto" tautomerization to make things straightforward.
Similar to hydration (adding water) of alkenes, hydration of alkynes necessitates the use of a potent acid, typically sulfuric acid with a mercuric sulfate catalyst.
Therefore, Hydration of alkynes with h3o typically requires a mercury catalyst is a false statement.
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how many of the identified elements are present in each compound:
option choices are 1,2,3,4,10,12,16 they can be used multiple times
The numbers of the compounds (1 - 9 as shown) and the number of atoms of each element are shown below;
1) One Al atom
2) Three oxygen atoms
3) three hydrogen atoms
4) 1 magnesium atom
5) 2 carbon atoms
6) 2 nitrogen atoms
7) 3 nitrogen atoms
8) 12 hydrogen atoms
9) one phosphorus atom
What is a compound?A compound is composed of elements. The elements that make up the compound must be bonded by means of a chemical bond. The bond could be an ionic bond, a covalent bond or a metallic bond. The ionic bond is more found among metals and non metals. The covalent bond is found among two nonmetals while the metallic bond is found between two metals.
Now we know that there is a given number of the atoms of each element that we can find in a compound and this varies from one element to another. We can know the number of atoms that can be found in each of the elements if we can be able to look at the chemical formula of the compounds.
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What is the volume of a cylinder made from * Aluminum with a height of 10mm, a mass of 30g, and a density of 2.7g/cm3?
The volume of a cylinder is 11.11cm³.
What is volume of a cylinder?
This refers to the amount of space the cylinder contains. It can be calculated by multiplying its base by its height.
The formula is given by;
volume of a cylinder, vol= πr²h
where,
Pi, π=22/7
the radius of the base of the cylinder, r
Height of the cylinder, h
Note from the question;
Height, H=10mm
mass, m=30g
Density, ρ= 2.7g/cm³
recall,
Density, ρ=Mass/volume
since the mass and the density of the cylinder are given, we can calculate the volume using;
Density, ρ=Mass/volume
ρ=30g/2.7g/cm³
ρ=11.11cm³
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in which reaction would an increase in pressure at constant temperature have no effect on the relative amounts of the substances present in the equilibrium mixture? all substances are gases.
As pressure rises, the equilibrium will move to the side of the reaction where there are less moles of gas. When the pressure drops, the equilibrium will move to the side of the process where there are more gas molecules.
Why is the equilibrium constant unaffected by pressure?Similar to how concentration has no bearing on Kc's value, pressure has no impact on Kp's.
As a result of the equilibrium shifting in favour of the direction with fewer moles due to an increase in pressure, the pressure falls.
Kp is unchanged because the reactant to product partial pressure ratio remains constant.
According to Charles' law, a gas's volume will double if its temperature doubles.
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Chemical reactions and nuclear reactions cause matter to change in different ways. Which two statements describe how matter changes only in a nuclear reaction?.
Chemical reactions are those that take place between different elements to create bonds through the transfer, sharing, loss, or gain of electrons. While inside the atom's nucleus, nuclear processes take place.
It does not depend on the number of electrons because protons and neutrons are involved. The smallest division into which a chemical reaction can be divided, the elementary reaction has no intermediate products. The majority of reactions that are detected in experiments are built up from several simpler reactions that take place simultaneously or sequentially. chemical reactions mechanism is the term used to describe the real order of the several elementary reactions.
A membrane-bound organelle found in eukaryotic cells is the cell nucleus (plural nuclei; from Latin nucleus or nucleus, meaning kernel or seed). Typically, one nucleus can be found in eukaryotic cells.
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what should the charge of a sulfide ion be in order for it to have the same electron configuration as that of neutral phosphorus in the ground state?
Sulfide ion (S+) with +1 charge has the same electron configuration as neutral phosphorus in its ground state. With the chemical formula S, Sulphur dioxide is an inorganic anion of Sulphur.
Following is the neutral phosphorus ground state electron configuration at atomic number 15.
phosphorus-15: 1s, 2s, 2p, 6, 3s, 2p
The electronic configuration of sulphur, which has atomic number 16, is once more as follows.
S-16: 1s, 2s, 2p, 6, 3s, 2p, 4.
From the aforementioned electronic configuration, we can infer that sulphur has one more electron in its valence shell than does phosphorus.
Sulphur must therefore release one electron from its valence shell, converting it from S -1e——>S+, to achieve the same electron configuration as phosphorus, which has 15 electrons.
Similar to this, the sulfuric acid ion, S2- - 3e—->S+
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Indicate the direction of polarity of each of the covalent bonds by placing the appropriate delta notation next to each end of the bond.
The delta notation, indicating the polarity of for the presented covalent bonds are:
δ+ C-O δ-
δ- O-Cl δ+
δ+ O-F δ-
δ+ C-N δ-
δ+ C-Cl δ-
δ- S-H δ+
δ+ S-Cl δ-
How delta notation indicate the polar bonds?
Atoms with varying electronegativities form polar bonds.
The polarity direction is denoted using the delta notation.
A partial negative charge (represented by the symbol -) is acquired by the atom with the higher electronegativity, whereas a partial positive charge (represented by the symbolδ +) is acquired by the atom with the lower electronegativity.
Let's consider the following elements with their electronegativities.
C (2.5)
O (3.5)
Cl (3.0)
F (4.0)
N (3.0)
S (2.5)
H (2.1)
The delta notation for the presented bonds are:
δ+ C-O δ-
δ- O-Cl δ+
δ+ O-F δ-
δ+ C-N δ-
δ+ C-Cl δ-
δ- S-H δ+
δ+ S-Cl δ-
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which is NOT a result of water surface tension
1. water forming spherical drops on all freshly waxed surfaced
2.an insect floating on the surface of water
3. water raising up into a thin glass tube
4. ice floating in liquid water
Ice floating in liquid water is not a result of water surface tension, This is due to ice's lower density than liquid water, a result of its unique hydrogen bonding arrangement.
Option (4) is correct.
Surface tension is a property of liquids, including water, caused by the cohesive forces between their molecules. It results in the formation of a "skin" on the liquid's surface, which gives rise to several observable phenomena.
1. Water forming spherical drops on freshly waxed surfaces: This happens because of the cohesive forces between water molecules, which cause the liquid to minimize its surface area and form spherical shapes.
2. An insect floating on the surface of water: Surface tension allows insects like water striders to walk on water. The cohesive forces hold the water's surface together, enabling the insect to stay afloat.
3. Water raising up into a thin glass tube (capillary action): Surface tension, along with adhesive forces between water and glass, allows water to rise against gravity in thin tubes.
4. Ice floating in liquid water: This is an exception to the usual behavior of substances. Ice is less dense than liquid water, so it floats on the surface due to its unique hydrogen bonding arrangement.
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calculate the average atomic mass of chromium, given the following percent abundances and isotopic masses: 4.350% 49.946 amu; 83.790% 51.941 amu; 9.500% 52.941 amu and 2.360% 53.939 amu.
average mass= [tex]49.9461*0.0435 + 51.9405*0.8379 + 52*0.095 + 53.9389*0.0236 or 51.995[/tex] u rounded off to [tex]52.0 u.[/tex]
The final answer is closer to [tex]51.9405[/tex] because more of this isotope existed than the others
How to calculate average atomic mass ?
The average atomic mass for an element is calculated by adding the masses of the element's which of each is multiplied by its natural abundance on Earth. When doing any mass calculations involving elements or compounds, always use average atomic mass, which can be found on the periodic tableThe average atomic mass is useful because its numerical value is equal to the molar mass of the element. This in turn is useful to know how much of a solid to take when you wish to react it with some known quantity of another reagent, because weighing is typically the easiest way to quantify a substanceThe key difference between atomic mass and average atomic mass is that the atomic mass is the mass of an atom, whereas the average atomic mass is the mass of an atom of a particular chemical element calculated by considering isotopes of that element.Calculate the average atomic mass using the atomic masses of each isotope and their percent abundances. Divide each percent abundance by 100 to convert it to decimal form. Multiply this value by the isotope's atomic mass. Add the atomic masses of each isotope together to get the average atomic mass.to know more about average atomic mass follow
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automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: how many moles of n2 are produced by the decomposition of 2.88 mol of sodium azide?
4.32 moles of N2 are produced by the decomposition of 2.88 mole of sodium azide.
Equation:
2 NaN3(s) ⇒ 2 Na(s) + 3 N2(g)
According to the above equation, sodium azide has the chemical formula NaN3, while nitrogen gas has the formula N2.
Therefore, if on decomposition
3 moles of N2 is created by 2 moles of NaN3
Z moles of N2 is created by 2.88 mole of NaN3
To get the value of Z, cross multiply
Z x 2 moles = 3 moles x 2.88 moles
2 moles x Z = 8.64 moles²
Divide both sides by 2 moles
2 moles x Z/2 moles = 8.64 moles²/2 moles
Z = 4.32 moles
Thus, 4.32 moles of N2 are produced by the decomposition of 2.88 mole of sodium azide.
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how many valance electrons B (boron) have?
Answer:
3
Explanation:
which extinguishment method involves foam creating a barrier between the fuel gases and any possible ignition sources?
The extinguishment method is Smothering
What is smothering?The technique of smothering involves denying the fire the oxygen it needs to continue burning. Applying fire extinguishing products that block the chemical chain reaction at the molecular level is called interference. Restricting oxygen by keeping air from reaching the fire's center so that the combustion process can lower the amount of oxygen in the enclosed space until the fire extinguishes itself. The foam smothers the flames by covering the fuel surface. The foam covering keeps the fuel surface and the flames/ignition source apart. Foam cools the fuel as well as any nearby metal surfaces. The foam blanket prevents combustible vapors from escaping and mixing with the air. Foam (Class A and B) extinguishes fires in solids and liquids, but not in gases.
The extinguishment method involves foam creating a barrier between the fuel gases and any possible ignition sources is smothering.
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what is the molarity of a solution of nitric acid if 0.216g of barium hydroxide is required to neutralize 20.00ml of nitric acid
The molarity of a solution of nitric acid if 0.216g of barium hydroxide is 0.1715 M.
Molarity (M) is the quantity of a substance in a sure volume of answer. Molarity is defined as the moles of a solute according to liters of a solution. Molarity is likewise referred to as the molar attention of an answer.
Given;
mass = 0.216
volume = 20 ml = 0.02L
The molar mass of nitric acid = 63
moles = mass/molar mass
= 0.216/63
= 3.43
= 0.00343
Molarity = moles/volume
= 0.00343/0.02
= 0.1715
Molar concentration is the degree of the concentration of a chemical species, especially of a solute in a solution, in terms of the amount of substance in keeping with the unit volume of the solution. In chemistry, the most usually used unit for molarity is the number of moles in step with liter, having the unit image mol/L or mol/dm³ in SI unit.
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If the total mass of reactants in a chemical reaction is 20g, what can we say about the total mass of products?.
If the total mass of reactants in a chemical reaction is 20 g, we can say that the total mass of the products formed in a reaction is 20g.
The law of conservation of mass states that mass cannot be created, nor to be destroyed. It can be converted from one form to the another form. In other words, we can say that the mass of the reactant is equal to the mass of the product. For example, the reaction between 12 g of H₂ and 8 g of O₂ forms 20 g of H₂O. Its balanced reaction is given as
2H₂(8g)+O₂(12g)→2H₂O(20g)
In the above reaction, 8g of hydrogen when reacts with 12 g of oxygen forms 20 g of water as a product. No loss in the mass is observed in the reaction when it is completed.
Therefore, if the total mass of reactants in a chemical reaction is 20 g, we can say that the total mass of the products formed in a reaction is 20g.
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a certain ideal gas is kept at 350 k in a container with a volume of 3.00 cubic meters. if the volume is expanded to 4.00 cubic meters, what will the temperature of the gas be? what is the average kinetic energy of a gas molecule at this temperature
A certain ideal gas is kept at 350 k in a container with a volume of 3.00 cubic meters. if the volume is expanded to 4.00 cubic meters, the temperature of the gas be 466 K.
As per the ideal gas formula :
V1/T1 =V2/T2V1 = initial volumeT1= initial tempV2 = final volume T2 = final tempSo V1/T1 =V2/T2 = 3/350=4/T = 466KThus the temperature of the gas be 466K.Average kinetic energy of a gas molecule at this temperature is calculated by 3/2 kb. kinetic energy = 3/2 x 1.38 x [tex]10^{23}[/tex]x 466.67 = 9.66 x [tex]10^{-23}[/tex] kinetic energy = 9.66 x [tex]10^{-23}[/tex].
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calculate the number of grams of aluminum required to prepare 297.0 g of chromium metal by the first reaction.
To prepare 297.0g of chromium we need 154.21g of aluminum.
The preparation of chromium using aluminum powder is an exothermic process. It is the reaction where heat is released during the formation of product.
Therefore, the chemical reaction for the formation of chromium is:
Cr2O3(s) + 2Al(s) -> 2CrO(s) + Al2O3(s)
Here, we can see that 2 moles of aluminum produces 2 moles of chromium.
Hence,
Molar mass of aluminum = 27g
as 2 moles of aluminum is required then 2 x 27 = 54g.
Molar mass of chromium = 54g
As, 2 moles of chromium is obtained then 2 x 54 = 104g.
Therefore, by cross multiplying we get the amount of aluminum required,
mass of aluminum produced = 54 x 297.9/ 104
= 16038/104 = 154,21g.
Therefore, the required amount of aluminum is 154.21g
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Draw the product for the following reaction between an alkyne and one equivalent of hcl.
To solve such this we must know the concept of addition reaction. The reaction between alkyne and HCl gives addition product. The reaction can be written as
CH[tex]\equiv[/tex]CH +HCl[tex]\rightarrow[/tex]CH[tex]_2[/tex]=CHCl
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Alkyne is electron rich species. The reaction between alkyne and HCl gives addition product. The reaction can be written as
CH[tex]\equiv[/tex]CH +HCl[tex]\rightarrow[/tex]CH[tex]_2[/tex]=CHCl
Therefore, the reaction can be written as
CH[tex]\equiv[/tex]CH +HCl[tex]\rightarrow[/tex]CH[tex]_2[/tex]=CHCl
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write the net ionic equation for any precipitation reaction that may be predicted by the solubility rules, when aqueous solutions of aluminum iodide and potassium phosphate are combined.
The reaction between potassium phosphate with aluminum iodide will produce aluminum phosphate and potassium iodide. By the general solubility rules, aluminum phosphate will be insoluble in water resulting in the formation of a precipitate. [tex]K 3 P O 4 ( a q ) + A l I 3 ( a q ) > A l P O 4 ( s ) + 3 K I ( a q )[/tex] Let us break the reaction into a total ionic equation. [tex]3 K + ( a q ) + P O 3 -4 ( a q ) + A l 3 + ( a q ) + 3 I - ( a q ) > A l P O 4 ( s ) + 3 K + ( a q ) + 3 I - ( a q )[/tex] Then, we remove the spectator ions to establish the net ionic equation. [tex]P O 3 - 4 ( a q ) + A l 3 + ( a q ) > A l P O 4 ( s )[/tex]
what is a net ionic equation for a precipitation reaction?
To write the net ionic equation for a precipitation reaction: Use solubility rules to identify a precipitate (if any). Write the formula of the precipitate produced at the right of an arrow. Write the formulae for the ions that react to form that precipitate as reactants at the left of the arrow.Steps for Predicting Precipitation ReactionsStep 1: Look at the given reactants and note that precipitation reactions are double displacement reactions.Step 2: Look at solubility rules and predict products based on the double displacement rule.Step 3: Write out the complete balanced equation.The net ionic equation only shows the precipitation reaction. A net ionic equation must be balanced on both sides not only in terms of atoms of elements, but also in terms of electric charge. Precipitation reactions are usually represented solely by net ionic equations.The solubility of ionic solids in water depends on two things: (1) the energy change, DEdissolve, that occurs when the ionic solid goes into solution as hydrated ions, and (2) the effect of the hydrated ions on the arrangement of the surrounding water molecules, measured by the organization energyto know more about net ionic equation follow
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How do you find the molar mass of ammonia?.
The molar mass of ammonia can be find by adding the atomic mass of hydrogen and nitrogen. Molar mass is twice of the atomicity of the compound.
The molar mass is defined as an average of many instances of the compound, which often vary in terms of mass due to the presence of isotopes
We know that ammonia is compound which is made up of nitrogen and hydrogen.
It contains single atom of nitrogen and 3 atoms of hydrogen.
Molecular formula of ammonia is NH₃
So, molar mass of nitrogen =atomic mass of nitrogen +atomic mass of hydrogen
We know that atomic mass of nitrogen is 14 a.m.u where atomic mass of hydrogen is 1 a.m.u
So, molar mass of nitrogen is =14+3×1=17 a.m.u
Therefore, molar mass of nitrogen is 17 a.m.u
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Which 2 elements would be more alike? Li and Be or F and Br? How do you know? Explain.
the density of ethanol, a colorless liquid that is commonly known as grain alcohol, is 0.798 g/ml. calculate the mass of 19.1 ml of the liquid.
Mass of 19.1 ml of ethanol is 15.2418 g
What is density?
The substance's mass per unit of volume is its density (also known as specific mass or volumetric mass density). The Latin letter D can also be used to represent density, however the most common symbol is (the lower case Greek letter rho). Mass divided by volume is the mathematical definition of density.
Temperature and pressure have an impact on a substance's density. For solids and liquids, this variance is often negligible, whereas for gases, it is significantly higher. A loss in volume and subsequent increase in density occur when pressure is applied to an object. With a few exceptions, a substance's density is decreased by expanding its volume as its temperature is raised. In most materials, heating the bottom of a fluid induces convection, or the movement of heat from the bottom to the top, because the heated fluid rises relative to the denser unheated material due to its decreased density.
Given,
density of ethanol(D) = 0.798 g/ml
volume(v) = 19.1 ml
Density = mass/ volume
or D= m/v
mass(m) = D* v
m = 0.798* 19.1= 15.2418 g
Hence, mass of 19.1 ml of ethanol is 15.2418 g.
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how many milligrams of chloramine would you find in one cup (1.0) of drinking water if the concentration is 4.0 ppm?
0.948 mg of chloramine will be found in one cup of drinking water if the concentration is 4.0 ppm.
It is given that concentration of chloramine is 4.0 ppm which equals two 4 mg per litre. It is assumed that one cup of drinking water has a volume of 237 ml.
To calculate the amount of chloramine in one cup of drinking water:
237ml = 0.237L
4.0 ppm = 4g/L of chloramine
Mass of Chloramine in 0.237L = 4 grams/L* 0.237L
Mass of Chloramine = 0.948grams
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b. how would you prepare 225.0 mL of 1.33 M HCL FROM A 6.00 M stock solution?
c. what volume of 0.2500 M strontium hydroxide is required to completely react with 75.00 mL of 0.07942 M HCl?
B. To prepare 225.0 mL of 1.33 M HCl, measure 49.89 mL of the stock solution and dilute with water to 225 mL
C. The volume strontium hydroxide, Sr(OH)₂ required is 11.91 mL
B. How do I prepare 225.0 mL of 1.33 M HCl?
To prepare 225.0 mL of 1.33 M HCl, we must obtain the volume of the stock solution of HCl needed. This can be obtained as follow:
Molarity of stock solution of HCl (M₁) = 6 MVolume of diluted solution (V₂) = 225 mL Molarity of diluted solution of HCl (M₂) = 1.33 MVolume of stock solution of HCl needed (V₁) =?M₁V₁ = M₂V₂
6× V₁ = 1.33 × 225
6 × V₁ = 299.25
Divide both side by 6
V₁ = 299.25 / 6
V₁ = 49.89 mL
Thus, to prepare 225.0 mL of 1.33 M HCl, measure 49.89 mL of the stock solution of HCl, put it in a 225 mL volumetry flask and dilute with water to obtain the desired volume (i.e 225 mL)
C. How do I determine the volume of strontium hydroxide, Sr(OH)₂ required?
We'll begin by writing the balanced equation for the reaction
2HCl + Sr(OH)₂ —> SrCl₂ + 2H₂O
The mole of the acid, HCl (nA) = 2The mole of the base, Sr(OH)₂ (nB) = 1The volume of strontium hydroxide, Sr(OH)₂ can be obtained as follow:
Molarity of base, Sr(OH)₂ (Mb) = 0.25 MVolume of acid, HCl (Va) = 75 mL Molarity of acid, HClO₄ (Ma) = 0.07942 MVolume of base, Sr(OH)₂ (Vb) =?MaVa / MbVb = nA / nB
(0.07942 × 75) / (0.25 × Vb) = 2
5.9565 / (0.25 × Vb) = 2
Cross multiply
2 × 0.25 × Vb = 5.9565
0.5 × Vb = 5.9565
Divide both side by 0.5
Vb = 5.9565 / 0.5
Vb = 11.91 mL
Thus, the volume of the strontium hydroxide, Sr(OH)₂ required is 11.91 mL
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Write a chemical equation for the acid-base reaction that occurs when p-phenetidine.
Based on the information provided, it should be noted that an acid-base reaction is a chemical process in which hydrogen ions are transferred between species.
Acid-base reaction: These are the reactions that take place when pure acids and bases are combined.
One of phenetidine's three isomers, P-phenetidine, should be mentioned. Usually, it serves as an intermediary in the synthesis of medicinal medicines.
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calculate the isoionic and isoelectric ph of 0.028320.02832 m valine. enter your answers to the hundredths place.
Answer:
isoelectronic pH = 6.003
Explanation:
isoelectronic pH = (pKa1+pKa2)/2
an effective hot pack salt can release 5850 j of heat to the surroundings. how many grams of licl are needed to release this amount of heat?
4.01 grams of Licl are needed to release this amount of heat
What does one gram weigh?The gram is a unit of mass in the International System of Units (SI) that is equal to one thousandth of a kilogram. It was originally known as the gramme. Gram. This pen cap weighs around one gram. A weight scale like this one may provide a precise mass readout for many different things.
Mass of Licl required to release 5850J of heat to the surroundings.
Let x g Licl required.
Then x g ×∆H = 5850J
x g × 1.46 × 10³ = 5850
x = 5850/ 1.46 × 10³
x = 4.0068
so 4.01g Licl required.
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A quantity of gasoline injected into car engine has a potential chemical energy of 100 j. All of this energy is not converted into useable work because.
A quantity of gasoline injected into car engine has a potential chemical energy of 100 j. All of this energy is not converted into useable work because some energy is wasted as heat.
What is potential energy?
Your body can use the energy created when these molecules are broken down to perform tasks like walking or thinking. The potential energy in food molecules is not the only source, though. Every molecule that makes up the physical universe has potential energy stored inside its bonds.
Let's cross a few stepping-stones to learn why chemical energy has the potential to do work. We'll explore fundamental concepts related to molecules, chemical bonding in general, and some fundamental laws governing chemical processes. You'll see how the net overall energy balance of a chemical reaction determines the potential energy available for use once we've put everything together.
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Consider the first order reaction a → products where 25% of a disappears in 24 seconds. What is the half life of this reaction?.
The first order reaction A→products, where 25% of A disappears in 24 seconds. The half-life of a reaction is 58 second.
In the given problem, first find out the rate constant for first order reaction. It is calculated as
k=(2.303/t)×log(a/a-x)
Assume that we started with 100% of A. Therefore, a=100
a-x=100-25=75
t=24 seconds
Plug all values in the formula
k=(2.303 second⁻¹/24)×log(100/75)
k=0.09596 second⁻¹×log(1.33)
k=0.09596 second⁻¹×0.12385
k=0.011885 second⁻¹
The half-life for first-order reaction is calculated as
t(1/2)=0.693/k
Plug value of k in the above formula
t(1/2)=0.693 second/0.011885
t(1/2)=58.3088 second
t(1/2)=58 second
Therefore, the half-life of the given reaction in which 25% of A disappears in 24 second is 58 second.
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5. A company is designing a whistle for lifeguards to use. They need to make the frequency between 1,000 and 5,000 Hz. Using the equation f-1/T, determine the
frequency where T-0.00075 seconds.
A. 37.50 Hz
B. 3,750.00 Hz
C. 13,333.33 Hz
D. 1,333.33 Hz
Answer:
C
Explanation:
What are 5 ways to prevent non communicable diseases?.
Reduce risk factors that are easily altered, as smoking, excessive alcohol consumption, poor diet, insufficient physical activity. Establishing ,enforcing sound legislative protections against non-communicable diseases .
What is a simple communicable disease?A transmittable disease is one that can be spread from one generation to another via a number of routes, such as contact with blood or body fluids, inhalation of an airborne virus, or insect bites.
Why are contagious diseases significant?The design and evaluation of illness preventive and control initiatives as well as the identification of common-source outbreaks depend on the reporting of communicable illness cases. Everybody will probably experience a communicable sickness at some time during their lives.
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