The pOH of the 0.188 M [tex]NH_3[/tex] solution at 25°C is 3.81.
To determine the pOH of the given solution, we first need to calculate the concentration of hydroxide ions in the solution. We can do this by using the equation:
[tex]$K_b = \frac{[OH^-][NH_3]}{[NH_4^+]}$[/tex]
where Kb is the base dissociation constant for ammonia ([tex]NH_3[/tex]), [[tex]NH_3[/tex]] is the concentration of ammonia, [[tex]$NH_4^+$[/tex]] is the concentration of ammonium ions ([tex]$NH_4^+$[/tex]) (which is equal to [H+]), and [OH-] is the concentration of hydroxide ions.
We can rearrange the equation to solve for [OH-]:
[tex]$[OH^-] = \frac{K_b[NH_4^+]}{[NH_3]}$[/tex]
The concentration of [tex]$NH_4^+$[/tex] can be calculated from the concentration of [tex]NH_3[/tex] using the equation for the ionization of ammonia in water:
[tex]$NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-$[/tex]
The equilibrium constant expression for this reaction is:
[tex]$K_w/K_b = \frac{[NH_4^+][OH^-]}{[NH_3]}$[/tex]
where Kw is the ion product constant for water [tex]1.0 \times 10^{-14}$ at 25°C[/tex].
We can rearrange this equation to solve for [[tex]$NH_4^+$[/tex]]:
[tex]$[NH_4^+] = \frac{K_w}{K_b[NH_3]/[OH^-]}$[/tex]
Substituting this expression for [[tex]$NH_4^+$[/tex]] into the equation for [OH-], we get:
[tex]$[OH^-] = \frac{K_bK_w}{[NH_3][OH^-]}$[/tex]
Simplifying this expression, we get:
[tex]$[OH^-]^2 = \frac{K_bK_w}{[NH_3]}$[/tex]
Taking the square root of both sides, we get:
[tex]$[OH^-] = \sqrt{\frac{K_bK_w}{[NH_3]}}$[/tex]
Substituting the given values into this equation, we get:
[tex]$[OH^-] = \sqrt{\frac{(1.76 \times 10^{-5})(1.0 \times 10^{-14})}{0.188}} = 1.54 \times 10^{-4} \text{ M}$[/tex]
The pOH of the solution can be calculated using the equation:
[tex]$pOH = -\log[OH^-]$[/tex]
Substituting the value we calculated for [OH-], we get:
[tex]$pOH = -\log(1.54 \times 10^{-4}) = 3.81$[/tex]
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Alkaline (cold) perms(stronger)
What’s the approximate pH level?
What’s the main ingredient?
Is there a longer or shorter processing time?
The scale contains values from 0, which is the most acidic, to 14, which is an agricultural product that, though not always by weight majority, is the distinguishing or unique element in a cottage food product.
What differentiates one cuisine from another?A cuisine is a type of food distinguished by unique materials, preparation methods, and meals, and it is frequently related to a particular culture or geographical area. Dishes that are specific to a place are made possible by regional food preparation methods, customs, and ingredients.
Why is it vital to be aware of the many types of ingredients?To assess if a food product is a good decision or not, the ingredient list is the best resource you have at your disposal. In actuality, there is no other way to tell if a product is derived from actual food or if it also contains additives, added sugars, and vegetable oils.
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If i have an unknown quantity of gas at a pressure of 1. 2 atm, a volume of 31 liters, and a temperature of 87 0 c, how many moles of gas do i have?.
The moles of gas that I have If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87 0 C is 1.26 moles.
To determine the mol of gas, we can use Mendeleev-equation Clapeyron's:
pV = nRT
Where:
n is the number of moles = ?
p is pressure = 1.2 atm
V is volume = 31 liters
T is temperature = 87°C ⇒ (273+87) = 360 K
R is the constant of all gases = 0.082 L.atm/mol.K
So, we can define the n number as:
n = pV/(RT)
n = (1.2) (31) / (0.082) (360) =
1.26 moles
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what is the percentage mass of oxygen in barium phosphate?
How did the visigoths and Ostrogoths maintain a Roman style government
The First Germanic War and the crucial Battle of Anzio (378 CE), in which the Goths led by Fritigern overthrew Rome due to their oppression at the feet of Romans provincial rulers, were sparked
What is meant by provincial thinking?adjective. When you refer to someone or anything as provincial, you are expressing your disapproval of them because you find them to be monotonous and out of date. [disapproval] He made the choice to update the organization's rural image. Synonyms include local, exclusive, simpleminded, and uncultured More the opposites of provincial.
What does a provincial life entail?a member of or associated with a province. 2 pertaining to, or associated with, the provinces; regional. possessing beliefs and attitudes that are thought to be typical of country dwellers; simple or undeveloped; constrained.
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This chemical equation is balanced.
2Na+ 2H₂O → 2NaOH + H₂
How does this equation show the conservation of matter in a chemical
reaction?
OA. The reactants and products are substances that each have equal
numbers of atoms.
OB. The reactants and products have the same kinds of atoms and
equal numbers of each kind.
OC. The number of substances in the reactants is equal to the number
of substances in the products.
OD. The coefficients and subscripts in the reactants are the same as in
the products.
This chemical equation is balanced. 2Na+ 2H₂O → 2NaOH + H₂ this equation show the conservation of matter in a chemical reaction by the number of substances in the reactants is equal to the number of substances in the products. Therefore, option C is correct.
What is the conservation of matter ?The law of conservation of matter states that the same amount of matter exists before and after the change of reaction, none is created or destroyed in the reaction.
According to the law of conservation of mass, the total mass of the products in a chemical reaction is exactly equal to the total mass of the reactants.
Thus, option C is correct.
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Once the two atoms are bonded together, can you move the two atoms as a pair?
Yes, you can move the two atoms as a pair. This is because the bond between them is a covalent bond,
What is covalent bond?
A covalent bond is a type of chemical bond that involves the sharing of one or more pairs of electrons between two atoms. In a covalent bond, the atoms are held together by the attractive forces between the atoms’ shared electrons.
Covalent bonds are much stronger than ionic bonds, and occur between atoms in the same or different molecules. Examples of covalent bonds include the bonds between oxygen and hydrogen in water molecules and the bonds between carbon atoms in diamond.
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which pictogram is not mandatory for chemical labels and sds?
Explosive (Symbol: exploding bomb)
Flammable (Symbol: flame)
Oxidising (Symbol: flame over circle)
Corrosive (Symbol: corrosion)
Acute toxicity (Symbol: skull and crossbones)
Hazardous to the environment (Symbol: environment)
Health hazard/Hazardous to the ozone layer (Symbol: exclamation mark)
Serious health hazard (Symbol: health hazard)
Gas under pressure (Symbol: gas cylinder)
SDS’s are not denote for consumers. An SDS affects the hazards of working with the material in an occupational fashion.
For example, an SDS for paint is not highly relevant to someone who uses a can of paint once a year but is extremely important to someone who uses that paint 40 hours a week or per day 5-6 hours.
A safety data sheet (SDS), first known as a material safety data sheet) is an important information source for eliminating or minimizing the risks linked with the use of hazardous chemicals (hazardous substances and/or dangerous goods) in workplaces.
While the GHS uses a total of 9 pictograms, OSHA will only impose the use of eight.
The environmental pictogram is not compulsory but may be used to provide additional information.
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What is the formula for speed?
Answer:
distance/time is the answer
Chemit heated a olid red ubtance in a tube, the ubtance made a metallic liquid and a ga, which tatement bet decribe what happened to the red ubtance?
This is based on the process of chemical decomposition due to which experiment shows the red substance.
Compounds with an oxygen–oxygen single bond are categorised as peroxides. Hydrogen peroxide represents the simplest type of this group of chemicals.
It is characterized by its tendency to decompose, caused by the nature of its unstable peroxide bond. It must be stored with a stabilizer, such as acetanilide or similar organic materials.
The solution is not flammable, regardless of its concentration. However, hydrogen peroxide is a strong oxidizing agent, due to its chemical structure and unpaired electrons.
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There are ___ x 1024 molecules and ___ x 1024 atoms in 2 moles of NH3.
** To convert molecules to atoms, you have to multiply the number of molecules (your 1st answer) by the number of atoms in a single NH3 molecule.**
Round your answer to the tenths place.
There are 1.20×10²⁴ molecules and 3.60×10²⁴ atoms in 2 moles of NH[tex]_3[/tex]. The smallest unit of matter that may be split without producing electrically charged particles is the atom.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The remainder is made up of a cloud of electrons with negative charges around a positive-charged nucleus made up of protons and neutrons.
1 mole of NH[tex]_3[/tex], contains 1 nitrogen atom and 3 hydrogen atom
2 mole of NH[tex]_3[/tex], contains 2 nitrogen atom and 6 hydrogen atom
2 mole of NH[tex]_3[/tex], contains 2×6.022×10²³=1.20×10²⁴ nitrogen atom and 6×6.022×10²³=3.60×10²⁴ hydrogen atom
Therefore, there are 1.20×10²⁴ molecules and 3.60×10²⁴ atoms in 2 moles of NH[tex]_3[/tex].
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We’re are earths outer layer made of solid hard rock
how many atoms are there in 2 moles of oxygen molecules?
There are 12.044 × 10^23 oxygen molecule present in 2mole of oxygen molecule.
According to the context, the word may as well as may not encompass ions that meet this requirement. A molecule is a collection of two as well as more atoms linked together by the attractive forces described as chemical bonds.
The lowest unit into which a substance could be divided while still being the same substance would be a molecule. It is composed of two as well as more atoms which are chemically bonded to one another.
1 mole of oxygen = 1 O2 molecule
2 mole = 2 O2 molecule = 2 × 6.022 × 10^23 molecule = 12.044 × 10^23 molecule
Thus, 2 mole of oxygen will have 12.044 × 10^23 molecule
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9.0 mol Na2S reacts with 8.0 mol
CuSO4 according to the equation below:
Na2S + CuSO4
→
Na2SO4 + CuS
Considering only the 8.0 mol CuSO4,
how many moles of CuS form?
? mol CuS
Based on the mole ratio of the given chemical reaction, 8 moles of CuS are produced.
What is the mole ratio of the given equation?The mole ratio of an equation is the ratio in which the reactants in a given chemical reaction react with themselves to form products.
Both reactants and the products are present in a given mole ratio as given by the equation of the reaction.
The mole ratio of the given equation of reaction is obtained from the equation of the reaction as follows:
Na₂S + CuSO₄ → Na₂SO₄ + CuS
The mole ratio of CuSO₄ toCuS is 1 : 1
Hence, 8 moles of CuS are produced.
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what is mass composition of compounds?
Mass percent composition is calculated by comparing the molar mass of an element in a compound to the total molar mass of the entire compound.
1. Define acids and bases in terms of their chemical properties2. Compare and contrast the common properties of acids and bases.
Answer: Acids are chemical substances which are characterized by a sour taste in water medium. Bases are the chemical substances which are characterized by a bitter taste and are slippery to touch.
Explanation:
Acids have tendency to turn blue litmus to red. Some bases are soluble in water, while others are not. Water soluble bases are known as alkalis. They have tendency to turn red litmus to blue.
Acids and bases react with a wide range of chemical compounds to form salts.
Chemical properties of the following:
Reaction of acids and bases with metals. When a metal reacts with an acid, it generally displaces hydrogen from the acids. This leads to the evolution of hydrogen gas. The metals combine with the remaining part of acids to form a salt. Alkalis (bases that are soluble in water) react with metals to produce salt and hydrogen gas.
For example, the reaction of sulphuric acid with zinc.
H₂SO₄ ⁺ ZN ⇒ ZnSO₄ ⁺ H₂
For example, reaction of zinc with sodium hydroxide.
NaOH ⁺ Zn ⇒ Na₂ZnO₂ ⁺ H₂
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Which reaction would not occur as written due to the Activity Series of Metals (found in your Chemistry Reference Table)?
A. 3 Mg + 2 AlCl3 --> 3 MgCl2 + 2 Al
B. Al + NaCl --> AlCl3 + Na
C. Ca + CuCl2 --> CaCl2 + Cu
D. 2 K + 2 H2O --> 2 KOH + H2
A. 3 Mg + 2 AlCl3 --> 3 MgCl2 + 2 Al would not occur as written due to the Activity Series of Metals
Which metal is least active in the Activity Series of Metals ?The Activity Series of Metals is a list of metals in order of decreasing reactivity. The most reactive metals are at the top of the list and the least reactive metals are at the bottom. The metal that is considered the least active in the Activity Series of Metals is gold. Gold is a very unreactive metal, meaning that it does not easily form compounds with other elements or react with other substances. This is why gold is often used in jewelry and other decorative items, as it does not tarnish or corrode easily. Other metals that are considered to be relatively unreactive and are also located towards the bottom of the activity series include platinum and silver.
It is worth noting that the activity series of metals is not a definitive and absolute list. It is based on a specific set of conditions, such as the presence of a certain solvent or the concentration of certain ions, and the activity of the metals may change in different environments.
Additionally, the activity series can be useful to predict the outcome of displacement reactions, in which a more active metal can displace a less active metal from a compound. For example, zinc, a more active metal than copper, can displace copper ions from a copper sulfate solution to form zinc sulfate and copper metal.
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irregular shaped white piece with dull luster has a hardness of 3 and fizzes when placed in weak hydrochloric acid
When placed in mild hydrochloric acid, carbonate, an irregularly shaped white chunk with a poor sheen and a hardness of 3, fizzes in three directions with perfect rhombohedral cleavage.
What are hydrochloric acids used for?Hydrogen chloride (HCl) is often used as a bleaching agent to neutralise alkaline compounds in the food, textile, metal, and rubber industries. It is neutralised when released into the soil, and it hydrolyzes quickly when it comes into contact with water. hydrochloric acid, sometimes known as muriatic acid, is an aqueous solution of hydrogen chloride. It is colourless and has an unmistakable pungent odour.
How can I increase my hydrochloric acid naturally?You can consume more hyaluronic acid by include bone broth in your diet. Additionally, consuming foods like soy products, oranges, almonds, kale, and sweet potatoes may naturally increase your body's production of hyaluronic acid because they contain nutrients. Lemons' high levels of acid encourage the creation of hydrochloric acid, which facilitates better digestion. Lemons assist your body break down the nutrients it needs and slow down meal absorption. The water also boosts your hydration, which keeps your body functioning properly.
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is aluminum foil a heterogeneous or homogeneous mixture?
Answer:
Aluminum foil would be considered homogeneous mixture.
Aluminium foil is a homogeneous mixture rather than heterogeneous mixture which has more than 1 phase.
What are heterogeneous mixtures?Heterogenous mixtures is defined as a type of mixture where the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two can vary with each other with respect to particle size.They are easily separated from each other.
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Draw all stereoisomers of 1,2-dichlorocyclohexane. Use bold andhashed wedges to indicate the stereochemistry.
Stereoisomers are isomers formed by the spacial arrangement of atoms. There are mainly two types of stereoisomers, they are enantiomers, which are the mirror images and diastereomers.
The cis and trans isomerism is a type of configurational isomerism. Cis means on the same side and trans means on the different side. In this case it indicates different planes. In theory we can rotate the atoms between cis and trans configuration, but in real world such a change would not happen, because this process require energy.
In the case of 1,2- Dichlorocyclohexane, there are three stereoisomers. There is one cis and two trans isomers. The three isomers are
(1-S,2-R) Dichlorocyclohexane(1-R,2-R) Dichlorocyclohexane(1-S, 2-S) DichlorocyclohexaneR-S and S-R isomers are interchangeable because they form superimposable mirror images.
So there are three stereoisomers in the case of 1,2 Dichlorocyclohexane.
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A gas at STP has a volume of 37.8 L. If the temperature is raised to 295 K and the pressure is changed to 50.0 kPa, what is the new volume of the gas?
When a gas at a given temperature and pressure is changed, the new volume of the gas can be calculated using the ideal gas law.
What is the new volume of the gas?The ideal gas law states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature.Given the temperature and pressure of the gas, we can rearrange the ideal gas law to solve for V: V = nRT / P. In this equation, n and R are constants. Since the new temperature and pressure are given, we can calculate the new volume of the gas:V = nRT / PV = (n)(0.08206 L•atm/mol•K)(295 K) / (50.0 kPa)V = 45.49 L Therefore, the new volume of the gas at 295 K and 50.0 kPa is 45.49 L, which is an increase of 7.7 L from the original volume of 37.8 L at STP. This is due to the fact that when the temperature and pressure of a gas are increased, the volume of the gas increases as well.To learn more about the ideal gas law refer to:
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A gas at a pressure of 1 atm is in a
sealed 1.0 L container. What happens
to the pressure when the
temperature is reduced to half of the
original amount?
The pressure of a gas is directly proportional to its temperature. Hence, as temperature decreases pressure decreases. Therefore, as the temperature reduced to half, pressure also decreases to half. Then option D is correct.
What is Gay- Lussacs law?According to Gay- Lussacs law at constant volume, the pressure of a gas is directly proportional to the temperature.
Hence, P/T = constant.
Let P1 and T1 be the initial pressure and temperature and P2, T2 be the final quantities, then
P1/T1 = P2/T2
Given P1 = 1 atm
T1 = x ° C
T2 = x/2° C
Then P2 = P1 T2/T1
P2 = 1 × x/2° C / x° C
= 1/2 atm
That is one half of the initial pressure.
Therefore, the pressure of the gas reduces to half when temperature is reduced to half.
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Explain how migration can be used by scientists to predict the trends in the size of the human population.
The way migration can be used by scientists to predict the trends in the size of the human population because Population growth occurs when immigration rates are higher than emigration rates; the opposite occurs when emigration rates are higher than immigration rates.
How do migration patterns play in population trends?The rate of natural rise and the results of migration make up the rate of population expansion. As a result, a high rate of natural increase can be balanced by a high level of net in-migration, and a low rate of natural increase can be.
Migration will slow down aging in wealthy areas while speeding it up in underdeveloped ones. Most nations and regions that are seeing population declines do so primarily as a result of natural change (the distinction
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Calculate the volume of gas, in L, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm
The volume of gas is 3,949.31 litre, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm.
What is an ideal gas law ?The ideal gas law is also called as perfect gas law. It is the relation between the pressure P, volume V, and temperature T of a gas.
Given:
Volume of gas = ?
Number of moles (n) = 1.74 moles
Temperature (T) = 273K
Pressure (P) = 1 atm
R (gas constant) = 8.314
By an ideal gas equation
PV = nRT
By putting above value in ideal gas equation, we get
1 × V = 1.74 × 8.314 × 273
V = 3,949.31 litre
Thus, The volume of gas, in L is 3,949.31 litre, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm.
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What is an example of situational irony in the excerpt the open window?
The example of situational irony is “She rattled on cheerfully about the shooting and the scarcity of birds, and the prospects for duck in the winter. To Framton it was all purely horrible."
A situational irony is a literary device.
Situational irony refers to when an assumption is directly contrasted by an event that happens. It means when something opposite happens to what was being expected.
Saki uses situational irony to create humor in "The Open Window".
The character of Vera spins such an amazing tale of dead people and ghosts that Mr. Nuttel and the reader get captured in it and it is later revealed to be false and just a past time of Vera spinning tales.
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An umbrella i placed in a drink holding a volume of punch equal to 7ML. The height of the punch roe to 10 ML. If the ma of the umbrella wa 27G, what wa it denity?
An umbrella is placed in a drink holding a volume of punch equal to 7 mL. The height of the punch rose to 10 mL. If the mass of the umbrella was 27 g, the Density of the umbrella is 9 g/mL.
Given that :
The mass of the umbrella = 27 g
The volume of the umbrella :
= height of the punch rose - volume of the punch
= 10 mL - 7 mL
= 3 mL
The density of the umbrella is give as :
Density = mass / volume
Density = 27 g / 3 mL
Density = 9 g/mL
Thus, the density of the umbrella is 9 g/mL.
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Select the correct K expression for the following reaction: 3 A(aq) + B(s) = 2 Claq) + D(aq)
a. K = 2[C][D] / 3[A]
b. K = [C]^2[D] / [A]^3[B]
c. K =[A]^3 / [C]^2[D]
d. K = [C]^2[D] / [A]^3
Option (d) is correct. According to the Equilibrium expression, the product raised to its stoichiometric coefficient divided by same of reactant.
The term equilibrium constant expresses the relationship between products and reactants of a reaction at equilibrium. It shows with respect to a specific unit. Equilibrium constant can be expressed as K. It is the ratio of velocity constant of forward reaction to velocity constant of backward reaction. It is also defined as the ratio of product to molar concentration of product to the product of molar concentration of reactants.
K = [C]2 [D] / [A]3 [B]
Now for solids its value is 1. For a heterogeneous mixture, solids and pure liquids and solvents have an activity that has a fixed value of 1.
So, K = [C]2 [D] / [A]3
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_Ag₂NO₂ Cu → Cu(NO3)2 +_ Ag
what kind of replacement is it single or double or synthesis/combination combustion or decomposition
This is Single displacement reaction as copper is displacing silver from silver nitrate
What is Single-Displacement reaction?A single replacement reaction, also known as a single displacement reaction, occurs when one element in a molecule is swapped out for another. Starting ingredients are always pure elements combined with an aqueous compound, such as pure hydrogen gas or zinc metal. A new aqueous compound and a different pure element will be produced as products when a replacement reaction occurs.
Cu(s) + 2AgNo3(aq) → 2Ag(s) + Cu(NO3)2(aq)
What is a Displacement Reaction?When an atom or group of atoms in a molecule are replaced by another atom, this is referred to as a displacement reaction. For instance, copper metal is displaced when iron is added to a solution of copper sulphate.
A + B-C → A-C + B
The above equation exists when A is more reactive than B.
A and B have to be either:
Halogens where C indicates a cation.
Different metals wherein C indicates an anion.
Different kinds of single replacement reactions
The reactivity series identifies three primary categories of single replacement reactions:
Metal replacement refers to the displacement of one metal by another. When a metal displaces hydrogen gas, Hydrogen replacement is a process known as were an hydrogen replacement occurs. When a halogen engages in displacement, it is called halogen replacement.To know more about Single-Displacement reaction refer to :
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nuclear decay that can be stopped by skin or paper.
a. true
b. false
It is false that nuclear decay that can be stopped by skin or paper.
Most types of nuclear decay, such as alpha and beta decay, cannot be stopped by skin or paper. These types of decay involve the emission of particles (alpha particles or beta particles) that can penetrate through such thin materials. Gamma decay, on the other hand, involves the emission of high-energy electromagnetic radiation, which can be stopped or absorbed by thicker materials such as lead or concrete.
It's important to note that the ability of a material to stop or absorb radiation depends on its atomic structure and density, and the thickness of material.
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Rosa was looking for patterns to help predict the products of chemical reactions. She recorded three similar decomposition reactions in the table. What products should she record in the last row of the table? 2licl + 3o2 3licl + 2o2 2lio + 3cl2 3lio+ 2cl2.
The products Rosa recorded in the last row of the table should be: 2LiCl + 3O₂.
The type of reaction which Rosa did is a decomposition reaction which involves one compound that yields to more than one (or usually two) product. To determine the product, we can deduce that it has to contain elements of Li, Cl and O₂. So, from the options, the answer is 2LiCl + 3O₂.
What is a decomposition reaction?A decomposition reaction can be described as a chemical reaction in which one reactant breaks down into two or more products. Generally, decomposition reactions need energy input.
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Which type of soil can hold absorb more water and why?
Clayey soil can absorb more water due to its comparatively large pore size and ability to hold the water molecules.
Soil is composed of components such as minerals, gas, water and organic matter. It is divided into three components viz. sand, silt and clay.
The ability of a soil to absorb water depends upon its pore size. In clayey soil, it has relatively large pore size so the water molecules can be easily absorbed and stored in the pores unlike sandy soil.
Clay particles have cohesive force between them which helps to hold water molecules together, whereas this cohesive force is absent in sandy soil.
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