A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently. It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities.
Understanding why some fabrics are more durable and so more suited for particular uses comes from studying textiles. It permits one to comprehend the rationale behind why particular materials generate cool-looking clothing in addition to creating the sense of coolness when used as décor. A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently.
It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities. Although clothes don't necessarily make a person, they certainly help to develop a positive personality and a sense of self-assurance. Housewives should therefore be familiar with clothing and textiles to obtain the best out of it.
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A relationship that decreases the dependent variable when the independent variable increases is called __________________
molecule of the variables shift in the opposite directions when there is a inverse or negative relationship. In other words, the dependent variable grows if the value of the independent variable falls.
What is the name of the correlation here between dependent and independent variables?The dependent variable in this study are often the effect and the variable are the cause in a research investigation. Additionally, one could say that there is a cause-and- effect link between the independent and the dependent variables.
What kind of link does there exist between these two variables?A statistical method known as correlation is used to quantify and explain a link between two variables. The two factors are often just observed, not changed. Two scores from identical people must be used for the correlation
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3. Silances are more reactive than alkanes. Explain.
The lower bond energy of the silicanes make them more reactive than the alkanes.
What are the silicanes?We know that the members of group four has the ability to catenate and this is a property that characterizes all the elements that we can find in the group. However the extent to which the members of the group can be able to catenate is what we use to determine the stability of the bonds.
The alkanes are composed of the bonds that exist between carbon and hydrogen and the alkanes can be able to form very long chains and this can be used to explain the fact that you can be able to find the alkanes in various kinds of applications.
However, the bond energy of the silicanes is less than that of the alkanes hence they tend to be more reactive then the alkanes.
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A graduated cylinder contains 50.0 ml of water. A 23.5 g piece of unknown metal is carefully dropped into the cylinder. When
the metal is completely covered with water, the water rises to the 53.4 ml mark. What is the density of the unknown piece of
metal in g/ml?
To find the density of the unknown piece of metal, we can use the formula:
Density = mass / volume.
How to find the density ?The volume of the metal can be calculated by deducting the starting water volume (50.0 ml) from the final water volume (53.4 ml) after the metal is introduced. We know the mass of the unknown metal is 23.5 g.Volume of metal = 53.4 ml - 50.0 ml = 3.4 ml.Now we can substitute the values into the density formula: Density = 23.5 g / 3.4 ml = 6.9 g/ml.Therefore, the density of the unknown piece of metal is 6.9 g/ml.To know more about density , check out :
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Chemicals released into the air from human activity, such as sulfur dioxide and nitrous oxide, interact with the atmosphere to make acid rain.
in which atmosphere layer does this process happen?
A, thermosphere
B, mesosphere
C, troposphere
D, stratosphere
I NEED HELP ASAP!!!!!!
Troposphere atmosphere layer does this process happen The acidity of rainwater comes from the natural presence of three substances (CO2, NO, and SO2) found in the troposphere
What is troposphere?The lowest part of Earth's atmosphere is called the troposphere. The troposphere contains the majority of the mass of the atmosphere (about 75–80%). The troposphere is where most clouds of all varieties may be found, and this is also where most weather takes place.The lowest portion of our atmosphere is called the troposphere. It begins below the surface and rises to a height of roughly 10 kilometers (6.2 miles, or about 33,000 feet) above sea level. The troposphere, where we are located, is the lowest layer where most weather happens.Most weather occurrences occur in the troposphere, which is the first and lowest layer of the Earth's atmosphere. It includes 99% of the planet's water vapour and aerosol mass and 75% of the total mass of the planetary atmosphere.To learn more about troposphere refers to:
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5. Calculate the difference between the heats of reaction (□H-□E) at constant pressure and constant volume for the reaction C6H6(l) + 15 0₂ (g) → 12 (0₂(g) + 6H₂0 (l)
The difference between the heats of reaction (□H - □E) at constant pressure and constant volume can be calculated using the following equation:
□H - □E = □H - □V + □V - □E
Where □H is the heat of reaction at constant pressure, □E is the heat of reaction at constant volume, □V is the change in volume at constant pressure, and □E is the change in internal energy at constant volume.
To calculate the difference between the heats of reaction at constant pressure and constant volume for the given reaction, we need to know the values of □H, □V, and □E. Without this information, it is not possible to calculate the difference between the heats of reaction at constant pressure and constant volume.
This is Yolanda's desk. What could Yolanda do to increase the amount of force needed to move the desk?
Answer:
The last one.
Explanation:
The other ones add more force or give the same but the last one reduces it.
How to solve this problem? I am stuck
The functional group of molecules as follows :
Molecule 1. is aldehyde and ketone, Molecule 2 is acid and thio, Molecule 3 is acid and amide, Molecule 4 is alcohol and ether, Molecule 5 is Alcohol and acid. The image attached below show the functional group and molecules are labeled.
What is polar compound ?The polar compounds are those compound having different positive and negative charge, therefore the bonding with atoms such as nitrogen, oxygen, or sulfur.
A buffer is a solution the can control the pH change along with the addition of an acidic or basic substance. It is able to neutralize small amounts of added acid or base, So it maintains the pH of the solution. This is important to maintain pH ranges.
Thus, Molecule 1. is aldehyde and ketone, Molecule 2 is acid and thio, Molecule 3 is acid and amide, Molecule 4 is alcohol and ether, Molecule 5 is Alcohol and acid.
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Balancing chemical reactions. What is it and examples
Answer: A balanced chemical reaction is A balanced chemical equation where the number of atoms of each type in the response is the same on both reactants and product sides.
Explanation: Burning, and cooking are 2 examples.
When a person weighs himself in pounds, which system of measurement is he using?
Answers: customary or metric
Answer:
it is the British imperial and united states customary systems
Due to friction between a tire and the road surface, the temperature of the air inside a tire increases as one drives. if the tire pressure is 179 kPa when the car is in the driveway at 5.0 C, what is the pressure of the gas inside the tire when the temperature of the gas increases to 35 C? Assume tire volume and number of particles remain constant
Answer:
40.10 atm. is answer i think ....
If you react 35.1g of calcium 37.1g of oxygen.
Which is limiting reactant and how much product can be made
The limiting reactant would be calcium and the amount of product that can be made would be 7.14 grams.
Stoichiometic problemCalcium reacts with oxygen to form calcium oxide according to the following balanced equation:
[tex]2Ca + O_2 --- > 2CaO[/tex]
In other words, the mole ratio of Ca to O is 2:1.
Mole of 35.1 g Ca = 35.1/40 = 0.1275
Mole of 37.1 g O = 37.1/16 = 2.3188
This means that oxygen is in excess while Ca is the limiting reagent.
The mole ratio of Ca to CaO is 1:1, thus the equivalent amount of CaO that will be produced will also be 0.1275 moles.
Mass of 0.1275 moles CaO = 0.1275 x 56 = 7.14 grams
In other words, the limiting reactant of the reaction is calcium while the amount of the product that can be made is 7.14 grams.
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The mass of copper nitrate produced from reacting 3.65g of copper and 5.16g of nitric acid
The mass of copper nitrate produced in the reaction 3.65g of copper and 5.16g of nitric acid is 3.84g.
What gas is produced when copper combines with nitric acid?Nitric acid reacts with copper
4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l)
Deep blue colour characterises the copper nitrate salt that develops. Nitrogen dioxide is the gas that is created when strong nitric acid and copper interact. This maroon mist is nitrogen dioxide.
Copper :
=> mass copper nitrate
=> 3.65g Cu x 1mol of Cu/63.546 g Cu x 1 mol copper nitrate / 1 mol cu x 187.56 g/mol copper nitrate
=> 10.77g
HNO3 (Nitric acid):
=> Mass copper nitrate =3.65 g HNO3 X 1 mol HNO3/63.546 g HNO3 x 1mol of copper nitrate /4 mol HNO3 x 187.56 g/mol copper nitrate.
=> 3.84g.
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when might the BAC of a dead body be misleading or unhelpful
Answer: Blood alcohol levels at autopsy are valid up to 48 hours after death when simple principles are observed in the collection and storage of samples. Alcohol levels in samples of blood taken from the intact heart are as significant as levels of blood from the femoral veins.
Explanation:
Answer:
If the victim was submerged in water
Explanation:
12. Surface lakes of glacier meltwater are shown overflowing into channels, which then pour down
moulins. What happens to this water? Why is this bad for the glacier?
When surface lakes of glacier meltwater overflow into channels and pour down moulins (vertical shafts or tunnels in the ice), the water typically flows into the base of the glacier and can cause the glacier to melt more rapidly. This process is known as "moulin drainage," and it can be detrimental to the glacier because it can cause the glacier to lose mass more quickly.
Losing mass through moulin drainage can cause a glacier to retreat or shrink in size, which can have a number of impacts on the surrounding environment. For example, if a glacier is a primary source of water for a region, its retreat could lead to water shortages. In addition, the loss of a glacier can affect the local ecosystem and wildlife, and it can contribute to sea level rise if the glacier is located near the coast.
HOPE IT HELPS!What is the molecular weight of (NH4)2SO4
The molecular weight of [tex](NH_4)_2SO_4[/tex] would be 132 g/mol.
Calculation of molecular weightsThe molecular weight, otherwise known as the molar mass of substances is the sum of the molar weights of individual atoms that make up the substance.
[tex](NH_4)_2SO_4[/tex] is made up of 2 atoms of N, 8 atoms of H, 1 atom of S, and 4 atoms of O.
Molar weight of N is 14 g/molMolar weight of H is 1 g/molMolar weight of S is 32 g/molMolar weight of O is 16 g/molThus, the molecular weight of [tex](NH_4)_2SO_4[/tex] = (14x2) + (1x8) + 32 + (16x4)
= 132 g/mol
In other words, the molecular weight of [tex](NH_4)_2SO_4[/tex] is 132 g/mol.
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What are the units of the rate constant for each of the reactions in Table 12.2?
Rate Law
Rate = k [(CH₃ )₃ CBr]
Rate = k [Br₂]
Rate = K[ BrO₃⁻ ][Br⁻] [H⁺]²
Rate = k [ H₂][I₂]
The first reaction is a first order reaction and the unit of rate constant is s⁻¹. The second one is also a first order reaction with the same unit. Third one is a third order reaction with the unit for k as L² mol⁻² s⁻¹.
What is rate constant?Rate of a reaction is the rate of decrease in concentration of the reactants or increase in concentration of the products. The rate is directly proportional to the concentration of reactants and the rate law is written as:
rate = k [reactants]
where, the proportionality constant k is called the rate constant.
The order of a reaction is the sum of powers of the molar concentration of reactants. Thus, each reaction vary in order and the order of reaction also depends on the steps in the reaction.
The general formula of the unit of rate constant is L⁽ⁿ⁻¹⁾ mol⁽¹⁻ⁿ⁾ s⁻¹. Hence, first reaction is a first order reaction and the unit of rate constant is s⁻¹. The second one is also a first order reaction with the same unit.
Third one is a third order reaction with the unit for k as L² mol⁻² s⁻¹. The fourth one is a second order reaction. Thus, unit of rate constant is L mol⁻¹ s⁻¹.
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7
QUICK CHECK
Predicting Spontaneity
Identify each of these reactions as being spontaneous or nonspontaneous.
2C₂H₂(g)+50₂(g) → 4CO₂(g)+2H₂O(g)
AG-2,453.1 kJ
3H₂(g)+N₂(g) → 2NH₂(g)
CO₂(g) +2H₂O(g) → CH₂(g) +20₂(g)
DONE
AG=-33.3 kJ
AG=800.7 kJ
1. The reaction: 2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(g) ΔG = -2,453.1 KJ is spontaneous
2. The reaction: 3H₂(g) + N₂(g) → 2NH₂(g) ΔG = -33.3 KJ is spontaneous
3. The reaction: CO₂(g) + 2H₂O(g) → CH₂(g) + 2O₂(g) ΔG = 800.7 KJ is nonspontaneous
How do I determine which reaction is spontaneous or nonspontaneous?The Gibbs free energy is a core factor in determining whether a reaction is spontaneous or nonspontaneous. Gibbs free energy is given by the following formula:
ΔG = ΔH – TΔS
Where
ΔG is the Gibbs free energy ΔH is the enthalpy changeT is the temperature ΔS is the change in entropyNOTE
ΔG = Positive (non spontaneous) ΔG = Zero (equilibrium) ΔG = Negative (spontaneous)With the above information, we can determine which of the reaction is spontaneous and also the one which is nonspontaneous as shown below:
2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(g) ΔG = -2,453.1 KJ. The reaction is spontaneous since ΔG is negative3H₂(g) + N₂(g) → 2NH₂(g) ΔG = -33.3 KJ. The reaction is spontaneous since ΔG is negativeCO₂(g) + 2H₂O(g) → CH₂(g) + 2O₂(g) ΔG = 800.7 KJ. The reaction is nonspontaneous since ΔG is positiveLearn more about spontaneity of reaction:
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2. A small block of a metal with a mass of 223.1 grams when
submerged in a beaker containing water, the water level rises to
150.0 mL as shown in the figure here. If the density of the metal
block is 7.41 g/cm³ at 22°C, then what was the original water level
in the beaker?
Water leve
150 mL
The volume of the metal block can be calculated using the density and mass of the block is 30.0 cm³
What is metal block?A metal block is a solid piece of metal that is typically used for machining and other industrial applications. It is usually made from aluminum, steel, or other metals, and can be machined into a variety of shapes and sizes depending on the application. Metal blocks are also used for casting, forging, and other manufacturing processes. Metal blocks may also be used for decorative purposes, such as sculpture or engraving. They are also used in jewelry making and engraving, as well as in medical and dental applications.
The volume of the metal block can be calculated using the density and mass of the block:
Volume = Mass/Density = 223.1 g/7.41 g/cm³ = 30.0 cm³
Since the metal block was submerged in the water, the volume of the block will be added to the volume of water in the beaker. Therefore, the original water level in the beaker can be calculated using the following equation:
Original Water Level = 150 mL + (30.0 cm³/1000 cm³/mL) = 180.0 mL
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Which statement correctly describes the melting and boiling points of water?
A) They occur due to electrostatic forces between molecules
B) They are the same temperature.
C) They are 0°F and 100°F, respectively.
D) They both depend on the surface tension of water.
The temperature at which a solid transforms into a liquid at atmospheric pressure is referred to as the liquid’s melting point.
What are the melting and boiling points of water?The fact that water boils at a greater temperature than fluorine makes option C the correct choice. The melting point of water is zero degrees Celsius (32 degrees F). Depending on the atmospheric pressure, different amounts of water will boil at different temperatures. When purified water reaches its boiling point at sea level, it does so at 212 degrees Fahrenheit (100 degrees Celsius).
Compared to fluorine, water has a greater boiling point. Regarding the melting and boiling points of water and fluorine molecules, this statement is accurate.
The temperature at which a substance's solid and liquid phases are in equilibrium is known as its melting point. A temperature at which a substance's vapour pressure reaches its boiling point.
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Statement C; They are 0°F and 100°F, respectively, correctly describes the melting and boiling points of water. But Instead of F it should be degree Celsius.
What is Melting point? The temperature at which a substance changes its state from a solid to a liquid is termed as its melting point. The solid and liquid phases or states are in equilibrium at the melting point. Pressure and temperature affects a substance's melting point, which is typically reported at a standard pressure such 1 atmosphere or 100 kPa.The Melting point of water is 0°C and boiling point is 100°C.To know more about melting point visit
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Constant Volume
A 10.0L sample of gas in a rigid container at 1.00 atom and 200K is heated to
800K. Assuming that volume remains constant, what is the new pressure of the gas?
After
Can someone help me please
According to the question the new pressure of the gas is: 6.5512 kPa
What is pressure?
Pressure is the force applied to a surface divided by the area of the surface on which the force is applied. It is measured in units of force per unit area, such as pounds per square inch (psi) or pascals (Pa). Pressure can be caused by a variety of factors, such as the weight of air, the weight of a liquid, or the force of a gas. Pressure is an important concept in many fields, including physics, engineering, and chemistry.
The ideal gas law can be used to determine the gas's new pressure:
PV = nRT
where R is the universal gas constant, n is the number of moles, P is the pressure, V is the volume, and T is the temperature.
We know that V = 10.0L, n = 1.00 mole, R = 8.314 J/molK, and T = 800K.
As a result, the gas's new pressure is:
P = (1.00 mol * 8.314 J/molK * 800K) / 10.0L = 6.5512 kPa
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Why do some elements not take part in chemical bonds?
Answer:
Because there is some element which is already in an octet state and has no need to achieve it, they have a full electron in their outermost shells such as helium, argon etc.
Nitrogen monoxide and oxygen can be formed from the thermal decomposition of nitrogen dioxide.
2NO2 (g) = 2NO (g) + O₂(g)
In an experiment, 4 moles of nitrogen dioxide were put into a 1.0 dm³ container and heated
to a constant temperature. The equilibrium mixture contains 0.8 moles of oxygen.
What is the value of the equilibrium constant, Kc?
1.5 POINTS
A
C
E
LU
0.032
0.853
0.426
B
D
0.222
0.356
FINISH QUIZ
Answer:
0.355 moldm^-3
Explanation:
. If a balloon will rise off the ground when it contains 0.0226 mol of helium in a volume of 0.460 L, how many moles of helium are needed to make the balloon rise when its volume is 0.865 L? Assume that temperature and pressure stay constant.
The number of moles of helium (He) needed to make the balloon rise is 0.043 moles.
How to calculate number of moles?The number of moles of a gas can be calculated using the following expression:
V₁/n₁ = V₂/n₂
Where;
V₁ = initial volumen₁ = initial moles V₂ = final volumen₂ = final molesAvogadro’s law to predict what will happen to the volume of a sample of gas as we change the number of moles. Because V/n is a constant for any given sample of gas (at constant P and T).
At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas.
0.46/0.0226 = 0.865/n
20.3539823n = 0.865
n = 0.043 moles
Therefore, 0.043 moles is the number of moles of the gas when the balloon rises.
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determine the amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay. The half-life of the isotope is 16.5 hours.
Based on the given half-life, the amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is 33 hours.
What is the half-life of a radioactive isotope?The time needed for a quantity to decrease to half of its initial value is known as the half-life. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last.
Any substance that contains unstable atoms that release ionizing radiation during their natural decay is considered radioactive material.
Given the half-life of the radioactive sample of an isotope of bromine to be 16.5 hours. The amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is calculated as follows:
After one half-life, half of the sample remains, and half decays
After two half-lives, 1/4 of the sample remains, and 3/4 decays
The time for two half-lives = 16.5 hours * 2
The time for two half-lives = 33 hours.
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Need help ASAP 100 points!
How many molecules are in 2.3 moles of Oxygen?
Question 1 options:
2.06 x 1023 molecules
6.02 x 1023 molecules
1.4 x 1023 molecules
3.8 x 1023 molecules
1.4 x 1023 molecules are present in 2.3 moles of oxygen.
How many molecules will be in the 2.3 moles of oxygen?We know that if we multiply the 2.3 moles of oxygen with Avogadro's number which is 6.023 x 1023 then this will give us the number of molecules which is present in the 2.3 moles of oxygen and which is 13.85 x 1023.
Mole is a standard scientific unit for measuring large quantities of very small entities like atoms, molecules, or other specific particles. The mole entitles an extremely large number of units about 6.02214076 × 1023.
So we can conclude that by multiplying Avogadro's number with the 2.3 moles of oxygen then it will give us 1.4 x 1023 molecules.
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CAN SOMEONE HELP ME PLS I HAVE A FINAL TMMR WITH THESE
write the states of matter and balanced equations
- in the presence of heat gold (ll) acetate decomposes
- aluminum wire is added to a solution of nickel (ll) nitrate
- a solution of sodium phosphate is added to a solution of ammonium chromate
The states of matter and balanced equations are as follows:
Au(C₂H₃O₂)₂ (s) --> Au (s) + 2CO₂ (g) + 3H₂O (g)Al (s) + Ni(NO₃)₂ (aq) --> Al(NO₃)₃ (aq) + Ni (s)Na₃PO₄ (aq) + NH₄CrO₄ (aq) --> NaCrO₄ (aq) + NH₄PO₄ (aq)What is a balanced chemical reaction?Chemical bonds are broken and new bonds are formed during chemical reactions, but atoms in the reactants do not disappear and new atoms do not form products. Chemical reactions do not create or destroy atoms. The same atoms that were present in the reactants are present in the products—they are just rearranged in different configurations. must exist in
The subscript is part of the formula and should not be changed once the reactant and product formulas have been determined. The coefficients indicate the number of each substance involved in the reaction and can be changed to balance the equation.
In the presence of heat Gold (ll) acetate decomposes:
Au(C₂H₃O₂)₂ (s) --> Au (s) + 2CO₂ (g) + 3H₂O (g)
Aluminum wire is added to the solution of nickel (ll) nitrate:
Al (s) + Ni(NO₃)₂ (aq) --> Al(NO₃)₃ (aq) + Ni (s)
A solution of sodium phosphate is added to the solution of ammonium chromate:
Na₃PO₄ (aq) + NH₄CrO₄ (aq) --> NaCrO₄ (aq) + NH₄PO₄ (aq)
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in this task, you’ll observe a chemical reaction between baking soda and vinegar. How do you think the temperature of the reactants and the rate of reaction are related? Write a hypothesis to predict the relationship between the two parameters.
The temperature of both the reactants and the pace of reaction are correlated in the chemical reaction of baking soda and vinegar the warmth of the reactants causes a raise in the rate of action and vice versa.
Which is a chemical reaction *?When two or more compounds come into touch with one another and create a new substance, the process is known as a chemical reaction (s). Reactants or reagents are the name(s) for the substance(s) or substances that are initially incorporated into the chemical process.
What's the most important chemical reactions?A few synthesis processes can produce several products. One of the more significant chemical processes on Earth is photosynthesis. It enables some microorganisms and plants to transform carbon dioxide gas and water into storable glucose and oxygen. For life to exist on Earth, we need this oxygen.
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I need help with how to do question c, d, and e
The answer of the following question of concentration are:
c) The law expression for this reaction is k[A].
d) The value of k including its units is on the specific reaction.
e) The half-life of the reaction is T1/2 = 0.693/k.
What is concentration?
Concentration in chemistry is a measure of the amount of a substance that is present in a given volume. It is usually expressed in terms of mass, moles, or volume.
c) The law expression for this reaction is rate = k[A], where k is the rate constant. This is because in a first-order reaction, the rate of reaction is proportional to the concentration of the reactant.
d) The value of k depends on the specific reaction, and can be determined by measuring the reaction rate at different concentrations of A and plotting a graph of rate versus concentration of A.
e) The half-life of a first-order reaction is given by T1/2 = 0.693/k, where T1/2 is the half-life and k is the rate constant. The units of the half-life are seconds.
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a) S₂08²+ I- ----> I3- + SO₂ The reaction is carried out in a basic solution. Express a balanced redox equation using the ion-electron method.
Answer:
The ion-electron method involves breaking the reactants into their component ions and transferring electrons between the ions to balance the charge and the atoms. In a basic solution, the S²⁰⁸² ion will gain two electrons to form SO₂. The I¹⁻ ion will lose one electron to form I³⁻. The balanced redox equation using the ion-electron method is:
S²⁰⁸² + 2e⁻ + 2OH⁻ → SO₂ + H₂O
I¹⁻ + e⁻ → I³⁻
The overall balanced equation is:
2S²⁰⁸² + 2OH⁻ + I¹⁻ → 2I³⁻ + SO₂ + H₂O
the bond between br atoms in a br2 molecule is
Answer:
COVALENT
Explanation:
covalent and is formed by the sharing of two valence electrons.