The half-life of a compound is 76 years for 42% of a given sample of the compound decomposes in 60 minutes.
What is the expression for rate law for first order kinetics?The rate law for first order kinetics is
k = [tex]\frac{2.303}{t}log\frac{a}{a-x}[/tex]
Where
k - rate constant
t - time passed by the sample
a - initial amount of the reactant
a-x - amount left after the decay process
What is expression for half-life of the compound?The expression for the half-life of the compound is
[tex]t_{\frac{1}{2} }=\frac{0.693}{k}[/tex]
Where k is the rate constant
Calculation for the given compound:It is given that
t = 60 minutes
a = 100 g
a-x = 100 g - 42 g = 58 g
(Since it is given that 42% of the given compound decomposes)
Then,
k = [tex]\frac{2.303}{60}log\frac{100}{58}[/tex]
= 9.08 × [tex]10^{-3}[/tex] [tex]years^{-1}[/tex]
Then, the half-life of the compound is
[tex]t_{\frac{1}{2} }=\frac{0.693}{k}[/tex]
= [tex]\frac{0.693}{9.08*10^{-3} }[/tex]
= 76.3 years ≅ 76 years
Therefore, the half-life of the given compound is 76 years.
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i think it’s b, true, & false. anyone confirm?? pls
Answer:
which question is it for
The substance used for decolorization of undisireable color in a crystalline substance is
The substance used for decolorization of undesirable color in a crystalline substance is powdered animal charcoal
Decolorization is the process of eliminating organic contaminants with vivid colors from the sample mixture.
Unwanted colors are removed by boiling the item with a suitable amount of powdered animal charcoal in a hot solution that has been filtered so that the charcoal may absorb the colors. The charcoal is a finely divided carbon.
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Which statement about gases is true?
A) They are made up of particles that always move very slowly.
B) They are made up of particles that travel in a curved path when in motion.
C) They are made up of hard spheres that vibrate quickly in stationary positions.
D) They are made up of hard spheres that are in random motion.
Answer:
B) They are made up of particles that travel in a curved path when in motion.
Explanation:
We know that gas, being a state of matter, is made up of particles. John Dalton's solid-sphere model was proven to be incorrect by Ernest Rutherford's gold foil experiment.
These particles do NOT always move very slowly. There are multiple different factors that affect the speed of the particles such as temperature or concentration.
IN NEED OF QUICK HELP Name both the reactant and product and then draw the reactant and product
Please explain
thanks
The reactant in this reaction is 2-fluoro-5-propyl - heptane while the product is 2-hydroxy-5-propyl - heptane.
What is a substitution reaction?We define a substitution reaction as one in which a given moiety is replaced by another. This is an example of a substitution reaction.
The name of the reactant in this reaction is 2-fluoro-5-propyl - heptane while the product is 2-hydroxy-5-propyl - heptane.
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A solution of NaOH has concentration of 1.2M then mass of NaOH in g/dm3 is
Answer:
A solution of NaOH has concentration 1.2M. Calculate the mass of NaOH in g/dm3 in this solution. = 1.2x 40x 1 = 48 g 3.
The mass of NaOH in the solution having concentration of 1.2 M is 48.00 grams per decimeter cubed (g/dm³).
Concentration refers to the amount of a solute dissolved in a given amount of solvent or solution. It is a measure of how much solute is present in a specific volume or mass of the solution.
Concentration can be expressed in various units, such as molarity (moles of solute per liter of solution), mass percent (mass of solute per 100 grams of solution), parts per million (ppm), and others.
Given:
Concentration of NaOH solution = 1.2 M
The molar mass of NaOH (sodium hydroxide) is:
Na: 22.99 g/mol
O: 16.00 g/mol
H: 1.01 g/mol
Total molar mass of NaOH = 22.99 + 16.00 + 1.01
= 40.00 g/mol
1 mole of NaOH = 40.00 g
1.2 moles of NaOH = 1.2 moles × 40.00 g/mole
= 48.00 g/L
1 L = 1 dm³
So, 48.00 g/L = 48.00 g/dm³
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there are 3.0 x 10^22 molecules of sucrose in a sample. how many grams of sucrose is this? The molar mass of C12H22O11 is about 342 g
The amount of sucrose in the sample would be 17 grams
Number of molecules of substancesThere are 6.022 x [tex]10^{23}[/tex] molecules in 1 mole of every substance.
3.0 x [tex]10^2^2[/tex] molecules will, therefore, be:
1 x 3.0 x [tex]10^2^2[/tex]/6.022 x [tex]10^{23}[/tex] = 0.0498 moles
Mass of 0.0498 moles sucrose = 0.0498 x 342 = 17 grams
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magenesuim 48.6g + oxygen 32.0 g = magenesuim oxide 80.6 g what is the mass of reactant
Answer:
2Mg+O=2MgO
Explanation:
32gram of reacting
calculate no. of molecules in 1120 ml CH⁴ at NTP
Answer:
0.3011 X10²³
Explanation:
hope this helps u
Noor and hanif wondered how they could produce a higher temperature change, their idea included adding more magnesium, using a different metals and using a different acid
How does the temperature change?
The temperature rise brought on by the interaction of magnesium with hydrochloric acid led Noor and hanif to wonder.
Determining the rate of temperature:
In order to gauge the temperature, Noor and hanif each added 10 cm of hydrochloric acid to a test tube. The same pieces of magnesium ribbon were then inserted. The temperature was again measured when the reaction ended.
The rate of temperature rise during a reaction. Heat energy is released when metals react with acids or water. A metal reacts exothermically with either water or acid.
Acid and metal reactions:
The test tube heated up when you added magnesium to dilute hydrochloric acid. Magnesium and hydrochloric acid interaction in an exothermic process.
magnesium + hydrochloric acid → magnesium chloride + hydrogen
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If the 3.21 g of NH4NO3 in Example 5.6 were dissolved in 100.0 g of water under the same conditions, how
much would the temperature change? Explain your answers
The temperature of the water will reduce by 2.4 °C from 24.9 °C 22.5 °C.
What is the temperature change?The temperature change when 3.21 g of NH₄NO₃ is dissolved in 100 g of water under the same conditions is determined using the formula:
The quantity of heat, q = mcΔTIn example 5.6, when 3.21 g of NH₄NO₃ is dissolved in 50 g of water at 24.9°C in a calorimeter, the temperature decreases to 20.3°C.
The quantity of heat absorbed, q = -mcΔT
m = 50 + 3.21 = 53.21g
Assuming the specific heat of the solution is the same as that of water;
c = 4.18 J/g/K
ΔT = 20.3 - 24.9 = -4.6 K
q = -(53.21 * 4.18 * -4.6)
q = 1023.12 J
Since, the same mass of NH₄NO₃ is dissolved, the quantity of heat absorbed is the same.
ΔT = - q/mc
m = 100 + 3.21 = 103.21 g
ΔT = - 1023.12 J/103.21 * 4.18
ΔT = -2.4 °C
Therefore, the temperature of the water will reduce by 2.4 °C.
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How does the selectivity filter of an ion channel prevent the passage of ions that are smaller or bigger than the ion for which it selects
The selectivity filter of an ion channel prevent the passage of ions that are smaller or bigger through forming the most constricted part of the conduction pathway.
What is an Ion?This is referred to a particle which is charged such as being positive, negative etc.
The selectivity filter being part of the constricted parts will ensure that the appropriate ions are bonded and moved into the cell.
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Two bonding pairs around a central atom results in a ________.
A. tetrahedral compound
B. linear compound
C. trigonal bipyramid
D. octahedral
Answer:
The asnwer to your question is A. tetrahedral compound
Explanation:
A tetrahedral is an object that has a central atom surrounded by four other atoms.
Linear chain compounds are materials composed of one-dimensional arrays of metal-metal bonded molecules or ions.
A trigonal bipyramid formation is a molecular geometry with one atom at the center and 5 more atoms at the corners of a triangular bipyramid.
An octahedron is a polyhedron with eight faces. The term is most commonly used to refer to the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.
I hope this helps and have a good day!
10. Using the below valency chart, write the chemical formula for aluminum oxide and
aluminum chloride
The chemical formula of aluminum chloride is AlCl₃ and the chemical formula of aluminum oxide is Al₂O₃.
Aluminum chlorideThe chemical formula of aluminum chloride is written as;
Al³⁺ + Cl⁻ → AlCl₃
Aluminum oxideThe chemical formula of aluminum oxide is written as;
Al³⁺ + O²⁻ → Al₂O₃
Thus, the chemical formula of aluminum chloride is AlCl₃ and the chemical formula of aluminum oxide is Al₂O₃.
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Answer:
gg mate
Explanation:
What happens in stage one of photosynthesis
Answer:
Photosynthesis occurs in two stages. During the first stage, the energy from sunlight is absorbed by the chloroplast. Water is used, and oxygen is produced during this part of the process.
Explanation:
Answer:
Chloroplast absorbs the energy emitted by the Sun.
_____________________________________________________
Context:
Photosynthesis:
The complex process by which carbon dioxide, water, and certain inorganic salts are converted into carbohydrates by green plants, algae, and certain bacteria, using energy from the sun and chlorophyll.
Chloroplast:
A plastid containing chlorophyll.
Chlorophyll:
The green coloring matter of leaves and plants, essentially to the production of carbohydrates by photosynthesis, and occurring in a blush-black form, C55J72MgN4O5 (chlorophyll a), and a dark-green form, C55H70MgtN4O6 (chlorophyll b).
Sun:
The star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance form earth is about 93 million miles (150 million km), its diameter about 864,000 miles (1.4 million km), and it's mass about 330,000 times that of earth; its period of surface rotation is about 26 days at its equator but longer at higher latitudes.
Explanation:
There are two main phases in photosynthesis:
depending on light stage
Clause Cycle (AKA the dark stage or the light-independent stage)
In the light-dependent stage, ATP and NADPH are produced using photons, or light energy. Oxygen molecules start to form during this stage as a byproduct.
Utilizing the materials produced during the light-dependent stage, the Calvin cycle fixes CO2 molecules to produce carbohydrates (sugars). This stage can repeat itself indefinitely since RuBP, the initial chemical required for the stage to go further, also serves as its byproduct.
A scientist uses an accelerator and high energy electrons to study the particles inside the protons of a helium atom. what particles is the scientist studying?
The scientist must be studying the Helium quarks.
Charged particles, such protons or electrons, are propelled at high speeds that are very close to the speed of light by an accelerator. Then, they are smashed either onto a target or onto other particles moving the other way.
Quarks and electrons are the two categories of fundamental particles that make up an atom.
An atom's nucleus is surrounded by an area of electrons. The electrical charge of every electron is negative one.
Protons and neutrons, which together make up an atom's nucleus, are made of quarks. Three quarks are found in each proton and neutron.
A fast-moving point of energy is a quark. Quarks come in a variety of types. Up quarks and down quarks are the two types of quarks that make up protons and neutrons.
The most basic and elementary component of matter is the quark. It is clear that the scientist is examining the quarks inside the proton when high energy particles are bombarded in the helium nucleus to analyze the particles inside. Two up quarks and one down quark are found in a proton.
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How many atoms of germanium
are present in a sample
containing 1.65 moles Ge?
Answer:
9.9363 x 10^23 atoms
Explanation:
1.65 x Avagadro's Number
1.65 * 6.022 x 10^23 =
141 ml of 1.2 m aluminum nitrate is mixed with 85 ml of 0.27 m sodium carbonate
Based on the mole ratio of the reaction:
Moles of aluminum carbonate produced = 0.00765 molesMoles of sodium nitrate produced = 0.02295 moles.What is the mole ratio of the reaction between aluminum nitrate and sodium carbonate?The mole ratio of the reaction is given by the equation of reaction as follows:
[tex]2\:Al(NO_{3})_{3} + 3\:Na_{2}CO_{3} \rightarrow Al_{2}(CO_{3})_{3} + 3\:NaNO_{3}[/tex]
The mole ratio of the products and reactants are used to determine the amount of product
Moles of aluminum nitrate reacting = 141/1000 * 1.2 M = 0.1692 moles
Moles of sodium carbonate reacting = 85/1000 * 0.27 = 0.02295 moles
Based on the mole ratio, sodium carbonate is the limiting reactant.
Moles of aluminum carbonate produced = 0.02295 * 1/3 = 0.00765 moles
Moles of sodium nitrate produced = 0.02295 * 3/3 = 0.02295 moles.
Therefore, the moles of the products aluminum carbonate and sodium nitrate produced is determined from the mole ratio of the reaction.
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Why don’t all ionic compounds dissolve in water?
Answer:
This is because the ionic forces in those molecules are very high, which creates high lattice energy
Explanation:
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60.0 mL of 0.0100 M H3PO4 are required to neutralize 30.0 mL of a solution of KOH. What is the molarity of the potassium hydroxide?
The molarity of the potassium hydroxide required to neutralize 60.0 mL of 0.0100 M H3PO4 is 0.02M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
CaVa = CbVb
Where;
Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of base60 × 0.0100 = 30 × Cb
0.6 = 30Cb
Cb = 0.6/30
Cb = 0.02M
Therefore, molarity of the potassium hydroxide required to neutralize 60.0 mL of 0.0100 M H3PO4 is 0.02M.
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4. Every morning we begin our day with a cup of tea which is made up of different components. Identify the process involved and mention its significance.
H2O is boiled with heat. Element which form a tea compound are pour in a cup and and the heated H2O is poured in the cup. Osmosis Occurs. Temperature and Stirring makes Osmosis Faster.
The warm water is poured into the cup together with the ingredients that make up the tea compound. Osmosis happens. Osmosis occurs more quickly with temperature and stirring.
Osmosis is the process by which water molecules pass across a cell's partly permeable membrane from a solution with a high concentration of water molecules to one with a lower concentration.
Through the process of osmosis, water is transferred from a location of high water concentration to a region of low water concentration. A semipermeable membrane is a surface that permits the passage of the chosen substances (in this case, water).
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When an electr ic cur rent is passed through water , two colou r less gases are produced. When hydrogen gas makes a po pping sound in the presence of a blazing splint, water is produced. Explain how each of these reactions demonst rates that water is a comp ound, not an element.
The lysis reaction with the formation of two different gases, and the synthesis reaction with the reaction of hydrogen and oxygen support that water is a compound and not an element.
What is electrolysis?The electrolysis is the analytical process for the separation or the deposition of the element in the presence of the electric field.
The passing of electric current through water results in the release of two types of gases. Thus, it can be said that water lysis or breakdown forms the release of two elements hydrogen and oxygen supporting the fact that water is a compound and not an element.
The production of water is found to be formed with the reaction of hydrogen with oxygen. Thus it supports that water is a compound and, not an element.
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rather than being oxidized for energy, sugars are connected by glycosidic linkages to make a capsule. which process does this describe
Rather than being oxidized for energy, sugars are connected by glycosidic linkages to make a capsule. This is catabolism process.
What is Glycosidic Linkage ?It is a type of linkage in which covalent bond that joins a carbohydrate molecules to another group is called glycosidic bond or glycosidic linkage.
Example: Hemiacetal and hemiketal.
What is catabolism ?Catabolism is the part of metabolic process which uses energy to break down into smaller units.
Thus from the above conclusion we can say that Rather than being oxidized for energy, sugars are connected by glycosidic linkages to make a capsule. This is catabolism process.
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1. A weather balloon has a capacity of 10 000 L at 100 kPa and 20.00°C. Cesium metal is
reacted with water to fill the balloon with hydrogen gas. How many moles of H₂ must be
generated to fill it?
The number of moles of H₂ that must be generated to fill it is 0.41 mole.
Number of moles of hydrogen gasApply ideal gas law;
PV = nRT
n = PV/RT
where;
P is pressureV is volumeR is ideal gas constantT is temperature = 20 °C = 293 Kn = (10 x 100)/(8.314 x 293)
n = 0.41 mole
Thus, the number of moles of H₂ that must be generated to fill it is 0.41 mole.
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What is the concentration if 0.25 mil is dissolved in 500cm cubed of solution
Answer:
0.5 mol/dm3
Explanation:
e.g. g/dm3, g/cm3 and mol/dm3
= g dm-3, g cm-3 and mol dm-3
A sample of gas occupies a volume of 72.0 mL . As it expands, it does 141.2 J of work on its surroundings at a constant pressure of 783 Torr . What is the final volume of the gas?
The final volume of the gas is 73.359 mL
Given :
A sample gas has an initial volume of 72.0 mL
The work done = 141.2 J
Pressure = 783 torr
The objective is to determine the final volume of the gas.
Since, the process does 141.2 J of work on its surroundings at a constant pressure of 783 Torr. Then, the pressure is external.
Converting the external pressure to atm; we have
External Pressure P[tex]ext[/tex]:
[tex]P ext[/tex] = 783 torr × [tex]\frac{1 atm}{760 torr}[/tex]
[tex]Pext[/tex] = 1.03 atm
The work done W = [tex]Pext V[/tex]
The change in volume ΔV= [tex]\frac{W}{Pext}[/tex]
ΔV = [tex]\frac{141.2 J \frac{1 L atm}{101.325 J} }{1.03 atm}[/tex]
ΔV = [tex]\frac{0.0014}{1.03}[/tex]
ΔV = 0.001359 L
ΔV = 1.359 mL
The initial volume = 72.0 mL
The change in volume V is ΔV = V₂ - V₁
- V₂ = - ΔV - V₁
multiply both sides by (-), we have:
V₂ = ΔV + V₁
= 1.359 mL + 72.0 mL
= 73.359 mL
Therefore, the final volume of the gas is 73.359 mL .
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How much heat is released when 25.0 grams of liquid copper at its freezing point of 1,085°c changes to solid? the latent heat of fusion of copper is 205.0 j/g. –27,130 j –5,130 j 5,130 j 27,130 j
Amount of heat released:
Heat is released when 25.0 gm of liquid copper at its freezing point of 1,085°C changes to solid is -5125 J
Given:
Mass of liquid copper, m= 25 gm
Latent heat of fusion of copper, L = 205.0 J/g
The amount of heat needed to change one gram of a substance from solid to liquid is known as the latent heat of fusion.
However, in this instance, it is necessary to determine the quantity of heat emitted when liquid copper solidifies.
So, L = -205.0 J/g
Calculation:
We may use the unitary approach to calculate the heat released when 25.0 grams of liquid copper solidify at 1,085°C, which is its freezing point.
So,
Q = L x m
Q = -205 J/g x 25 g
Q = -5125 J
So, the correct answer is b) -5,130 J, which is much nearest to -5125 J as we have calculated above.
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Answer:
-5,130 J
Explanation:
I got 100% on the quiz edge 2022
A certain first-order reaction a → b is 25% complete in 42 min at 25°c. What is the half-life of the reaction?.
The half-life of the reaction is 101.9 min
First order reactionWhen a reaction's pace and reactant concentration are inversely correlated, the process is known as a first-order reaction. To put it another way, the reaction rate doubles when the concentration does. One or two reactants can be present in a first-order reaction, as in the case of the decomposition process.
The half-life of first-order reaction:-The amount of time it takes for the initial concentration of the reactant(s) to decrease by half is known as the half-life of a chemical reaction (abbreviated as "t1/2").
Calculation:-a→b
25% reacted means 75% remains
t=42 min
Rate constant
k=(2.303/t)(log a/a-x)
k=(2.303/42)(log 100/100-25 )
k=(0.054) (log 100/75)
k=(0.054)(0.1249)
k=0.0068 per min
half life
t1/2=(0.693/k)
=(0.693/0.0068)
=101.9 min
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As the effective nuclear charge increases, electron affinity generally _______. Select the correct answer below: decreases increases
As the effective nuclear charge increases, electron affinity generally increases.
What is the relationship between electron affinity and effective nuclear charge?Electron affinity increases to the right, while EI increases to the right and upwards. Thus, the general trend of electronegativity is to grow to the right and upwards. The further to the right, the greater the effective nuclear charge and the greater the atom's ability to pull electrons toward it.
In this case, we can say that as the effective nuclear charge increases, electron affinity generally increases.
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How many electrons do silicon and oxygen atoms need to form octets?
Answer:
We convert two lone pairs of electrons from each oxygen atom to a covalent bond, as seen in the SiO2 Lewis dot structure. As a result, the valence shells of both silicon and oxygen have eight electrons.
structure and bonding t
Answer:
boring it
Explanation:
because boring is life style