Answer:
The correct ans is....
Option B) NH4" and H30*
Explanation:
NH4" and H30* is an example of conjugate pair
Hope this helps....
Pls mark my ans as brainliest :)PLS, PLS, PLSThe acid-conjugate base pair : ( B ) NH₄⁺ and H₃O⁻
The chemical reaction is
NH₄ + H₂O --> NH₃ + H₃O
Acid-conjugate base pairAn acid-conjugate base pair is a pair that consists of two substances that are different from each other just by the presence or absence of a proton ( H⁺ ) it helps to determine the relative strengths of acids and bases.
Hence we can conclude that the acid-conjugate base pair : ( B ) NH₄⁺ and H₃O⁻.
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+
For the reaction Pb(NO3)2 + 2KI Pbl2 + 2KNO3, how many moles of lead iodide are
produced from 237.1 g of potassium iodide?
Select one:
O a. 0.714
Ob. 5.47e4
O c. 1.54
Od 1.54
Answer: 0.714 moles of [tex]PbI_2[/tex] will be produced from 237.1 g of potassium iodide
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of potassium iodide}=\frac{237.1g}{166g/mol}=1.428moles[/tex]
The balanced chemical reaction is:
[tex]Pb(NO_3)_2+2KI\rightarrow PbI_2+2KNO_3[/tex]
According to stoichiometry :
2 moles of [tex]KI[/tex] produce = 1 mole of [tex]PbI_2[/tex]
Thus moles of [tex]KI[/tex] will require=[tex]\frac{1}{2}\times 1.428=0.714moles[/tex] of [tex]PbI_2[/tex]
Thus 0.714 moles of [tex]PbI_2[/tex] will be produced from 237.1 g of potassium iodide
Which energy profile best shows that the enthalpy of formation of CS2 is 89.4 KJ/mol?
Answer:
Option C. Energy Profile D
Explanation:
Data obtained from the question include:
Enthalpy change ΔH = 89.4 KJ/mol.
Enthalpy change (ΔH) is simply defined as the difference between the heat of product (Hp) and the heat of reactant (Hr). Mathematically, it is expressed as:
Enthalpy change (ΔH) = Heat of product (Hp) – Heat of reactant (Hr)
ΔH = Hp – Hr
Note: If the enthalpy change (ΔH) is positive, it means that the product has a higher heat content than the reactant.
If the enthalpy change (ΔH) is negative, it means that the reactant has a higher heat content than the product.
Now, considering the question given, the enthalpy change (ΔH) is 89.4 KJ/mol and it is a positive number indicating that the heat content of the product is higher than the heat content of the reactant.
Therefore, Energy Profile D satisfy the enthalpy change (ΔH) for the formation of CS2 as it indicates that the heat content of product is higher than the heat content of the reactant.
Why does increasing the concentration of reactants increase the reaction rate? A. Some of the reactants are likely to act as catalysts. B. The temperature increases with higher concentrations. C. Collisions of the right energy are more likely. D. Increasing the concentration changes the rate constant
Answer:
C. Collisions of the right energy are more likely.
Explanation:
By increasing the concentration of reactants, a higher number of reacting molecules or ions are present in the reaction. This increases the chances of collisions occurring to increase the reaction rate.
Answer: C
Explanation:
collisions of the right energy are more likely
use the crossover method to find the chemical formula of a calcium oxide
Answer:
CaO
how:
since its an iconic compound (metal(Ca)+non-metal(O)=iconic(CaO) we have to take account the charges
so;
[tex]Ca^{+2}[/tex] [tex]O^{-2}[/tex]
now we will cross them
[tex]Ca_{2} O_{2}[/tex]
since both the values are same will cross it out.
hence: CaO
substitution reaction always produce two products. The first is organic and the other is (________).
Answer:
nucleophilic
Explanation:
Answer:
I think its nucleophilic.
Explanation:
Why does silver gate tarnish on exposed to air
Answer:
when silver articles exposed to air silver racts with Sulphur present in the atmosphere and form a black layer of silver sulphide on the surface. copper articles get tarnished by reacting with air and water. due to this, a layer is formed over copper vessels.
Explanation: When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish If a silver object is to be kept from tarnishing, it must be protected from sulfur-containing gases.
can you help me understand this ? I completely dont understand it . i know the tire will burst.
Answer:
There is only one formula to use and we should assume ideal gas. This equation is: PV=nRT. For the following questions manipulate this equation to get the answer.
1. n = PV/RT = (249*1000 Pa)(15.6 L)(1 m^3/1000 L)/(8.314 Pa-m^3/mol-K))(21+273) = 1.59 mol
2. P = nRT/V = (1.59)(8.314)(51+273)/(15.6/1000)(1000) = 274.55 kPa
3. Since the answer in #2 is more than 269 kPa, then the tires will likely burst. 4. Reduce pressure way below the limit 269 kPa.
Explanation:
Answer:
There is only one formula to use and we should assume ideal gas. This equation is: PV=nRT. For the following questions manipulate this equation to get the answer.
1. n = PV/RT = (249*1000 Pa)(15.6 L)(1 m^3/1000 L)/(8.314 Pa-m^3/mol-K))(21+273) = 1.59 mol
2. P = nRT/V = (1.59)(8.314)(51+273)/(15.6/1000)(1000) = 274.55 kPa
3. Since the answer in #2 is more than 269 kPa, then the tires will likely burst. 4. Reduce pressure way below the limit 269 kPa.
Explanation:
c. What is the mathematical equation for the total pressure below the
surface of a fluid that has air above it? Identify each variable. (1 point)
Answer: Specific gravity=Density of material/Density of water
Explanation:
https://courses.lumenlearning.com/suny-osuniversityphysics/chapter/14-1-fluids-density-and-pressure/
Which of the following is one of the ending compounds during cellular respiration?
Answer:good luck!
Explanation:
what is ionic and covalent
Answer:
The two most basic types of bonds are characterized as either ionic or covalent. In ionic bonding, atoms transfer electrons to each other. ... In short, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.
Hope this helps.....
Pls mark my ans as brainliest :)If u mark my ans as brainliest then u r the "BESTESTEST " person in the world
A reaction between ethene and oxygen is used to produce epoxyethane. When silver is combined with ethene, the reaction for producing epoxyethane occurs much faster. What role does silver play in this chemical process?
A. Silver is a catalyst in this reaction.
B. Silver is a p-type semiconductor in this reaction.
C. Silver causes hydrolysis in this reaction.
D. Silver is an n-type semiconductor in this reaction.
Answer:
A. Silver is a catalyst in this reaction.
Explanation:
The most common use of rare-earth metals is as catalysts in chemical reactions.
To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option A that is Silver is a catalyst in this reaction.
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.
A reaction between ethene and oxygen is used to produce epoxyethane. When silver is combined with ethene, the reaction for producing epoxyethane occurs much faster. Silver is a catalyst in this reaction.
Therefore, the correct option is option A that is Silver is a catalyst in this reaction.
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What is a common misconception about not following food regulations?
Explanation:
Most Americans have encountered some bacteria at some point in their lives, whether it was acquired from restaurant food or a grocery store, which caused them to claim they later had food poisoning. There are multiple nasty bacteria that can cause this, and there are many misconceptions about how they end up in our food, and what the best ways to avoid them are. To be forewarned is to be forearmed, so here are several misconceptions about food safety and the practices involved that can leave us satisfied, or ruin our day with stomach churning nastiness.
Answer:it decreases customer satisfaction
Explanation:
Which atomic model shows the atom as a positively charged sphere with negatively charged electrons spread throughout
it?
A. Dalton's model
B. Thompson's model
C. Bohr's model
D. None of these
Answer:
B) Thomson's Model
Explanation:
Dalton's Model simply consisted of small spheres that represented atoms, and Bohr's model had a nucleus in the center with electrons orbiting in strict orbits, not randomly spread throughout. Thomson's plum pudding model, however, had an overall positively charged atom with many electrons spread throughout. If you search up "Plum Pudding Model" you can visually understand this.
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The atomic number of manganese (Mn) is 25. What's the electron configuration for manganese?
A. [Ar] 3s5 4p2
B. [Ne] 3d7
C. [Ne] 452 3p5
D. [Ar] 3d5 4s2
Answer:
[tex]\boxed{\sf D. \ [Ar] \ 3d5 \ 4s2}[/tex]
Explanation:
Manganese is a group 7 transition metal with an electronic configuration of [Ar] 3d5 4s2.
The atomic number of manganese (Mn) is 25. The electron configuration for manganese is [Ar] [tex]\rm 3d^5 4s^2[/tex]. Therefore, the correct option is option D.
The electron configuration depicts how electrons are dispersed throughout an atom's energy levels and orbitals. Manganese (Mn) has an atomic number of 25, meaning that the atom contains 25 electrons. Manganese (Mn) has the following electron configuration: [tex]\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5[/tex]
We can use the noble gas notation to indicate the electron configuration in a more compact form by indicating the noble gas that comes before the electron configuration. The noble gas that comes before manganese (Mn) is argon (Ar), whose electron configuration is[tex]\rm 1s^2 2s^2 2p^6 3s^2 3p^6[/tex]. The electron configuration of manganese (Mn) can be expressed as [tex][Ar] 3d^5 4s^2[/tex] using noble gas notation.
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Which type of molecule is shown below?
Answer:
[tex]\boxed{\mathrm{Alkene}}[/tex]
Explanation:
The hydrocarbon shown has a double bond. Hydrocarbons with double bonds are known as alkenes.
Cyclic alkanes have cyclic structure.
Alkanes only have single bonds.
Alkynes have triple bonds.
Answer:
Alkene
Explanation:
A molecule having a double bond between its atoms is called an alkene.
Which molecule contains a total of seven carbon atoms?
2-methyl-heptyne
2-methyl-propane
3-methyl-2-hexene
3-methyl-1-pentene
Answer:
3-Methylhex-2-ene
Explanation:
You count the atoms in the stems of the names and add them up.
C. 3-Methylhex-2-ene
Methyl = 1C
Hexene = 6C
Methylhexene = 7C
A. 2-Methylhept-1-yne is wrong. It has 1C + 7C = 8C
B. 2-Methylpropane is wrong. It has 1C + 3C = 4C
D. 3-Methylpent-1-ene is wrong. It has 1C + 5C = 6C
Why is warm honey easier to pour than cold honey?
A) Increasing the temperature breaks the molecules down into atoms, which are smaller.
B) Increasing the temperature increases the kinetic energy of the molecules, which makes it easier to overcome the attractive forces between molecules.
C) Increasing the temperature converts the sugars into water, which flows easier.
D) Increasing the temperature makes the honey more viscous.
Explanation:
Warm honey is easier to pour because the molecules or what we call as atoms are tightly packed in solids and when solids convert into liquid they flow easily.I HOPE YOU MIGHT FIND THIS VERY HELPFULLWITH LOVE FAULTYDEVILLOVE YA......warm honey easier to pour than cold honey due to Increasing the temperature converts the sugars into water, which flows easier.
What are the components of honey ?
Honey contains sugar, water and other ingredients, where Sugar gives gives sweetness, water maintain fluidity, and other components are present in a least amount and the differences are the color, aroma and taste.
Three types of sugar such as fructose (41%), grape sugar or glucose about 34% and sucrose contain 1 and 2%, other components include minerals, proteins, acids and undetermined matter.
Minerals constitute 3.68%, increase the value of honey for human consumption and the most common minerals are potassium, chlorine, sulfur, calcium, sodium, phosphorus, magnesium, silicon, iron, manganese and copper.
Proteins are collected from nectar and pollen which is the integral parts of plants, acids are also the component, vitamn C and some B complex vitamins such as riboflavin, pantothenic acid, pyridoxine, biotin, nicotinic acid are present.
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*LAST QUESTION , PLEASE HELP* Why does the land around an once active coal mine remain barren? a.) Empty coal mines are flooded with acid rain so no life forms can survive. b.) Ozone is formed from hydrocarbons which prevents the growth of plants. c.) The ground where the coal was mined is acidic so few plants can grow there.
The land around a once active coal mine remains barren because empty coal mines are flooded with acid rain, so no life forms can survive. The correct option is a.
What is a coal mine?Coal mines are the places where coal is extracted from. Mines are the place where abundant minerals are present. These minerals are extracted from these places to use the minerals as fuel, making other metals and things. The three types of coal mines are long wall mining, retreat mining, and room-and-pillar mining.
Mines are places that are dig or excavated to very deep, so the topsoil goes into the valleys hence no nutrients in the soil, no plants, and no life.
Thus, the correct option is a.) Empty coal mines are flooded with acid rain, so no life forms can survive.
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To what volume will a 2.33 L sample of gas expand if it is heated from 10.0°C to 100.0°C? Group of answer choices 0.233 L 4.41 L 23.3 L 3.76 L 3.07 L
Answer:
3.07 L
Explanation:
This question describes Charles law, which shows the direct relationship of the absolute temperature to its volume when the pressure is kept constant. The Charles' law equation is:
V1/T1 = V2/T2
Where; V1 is the volume of the gas at an initial state
V2 is the volume of the gas at a final state
T1 is the absolute temperature of the gas at an initial state
T2 is the absolute temperature of the gas at a final state.
According to the question, V1 = 2.33L, V2 = ?, T1 = 10°C, T2 = 100°C
The absolute temperature unit, which is Kelvin, need to be used. Hence, we convert °C to Kelvin using:
T(K) = T(°C) + 273.15
T1 (K) = 10°C + 273.15 = 283.15K
T2 (K) = 100°C + 273.15 = 373.15K
To solve for V2 in the above Charles law equation, we make V2 the subject of the formula by saying:
V2 = V1 × T2 / T1
V2 = 2.33 × 373.15 / 283.15
V2 = 869.4395/ 283.15
V2 = 3.0705
Hence, the gas will be expanded to a volume of 3.07L when heated from 10.0°C to 100.0°C.
Which factor influences the mass movement of particles?
O wind blowing across a body of water
O addition of vegetation to a slope
O large rocks and debris on a slope
O puddle of water resting on flat land
Answer: large rocks and debris on a slope
Explanation: Mass movement can simply be explained as the flow of earth materials down a slope. Movement of these materials such as rock particles , debris and soils are aid by the steepness of the slope or topography, wind or water moving down a slope at high speed and gravitational influence causing these particles to move down slope in the form of creep, landslide, slump or mudflow. When the slopes are covered with large rocks and debris, the occurrence of mass movement becomes imminent as these particles becomes unstable at slopes. Other influencing factor may include the movement of heavy wind or water down a slope or hill.
Which of the following is an example of ionization of an acid?
O NH3(g) + H2O(1)
→ NH4+(aq) + OH (aq)
None are correct
NaCl(aq) + AgNO3(aq)
→ AgCl(s) + NaN Na(aq)
HF(aq) + H2O(1)
→ H3O+(aq) + F (aq)
Au(NO3)3(aq) + Cu(s)
→ Au(s) + Cu(NO3)2(aq)
Answer:
NH3(g) + H2O(1) → NH4+(aq) + OH (aq)
HF(aq) + H2O(1) → H3O+(aq) + F (aq)
Explanation:
Acid-base reactions are chemical reactions involving acids and bases. Acids tend to ionize/dissociate in water, a property which determines their strength. Ionization of an acid refers to the acid losing its hydrogen ion (H+) in water solution. An acid ionizes or dissociates to form a conjugate base.
A strong acid is so because it ionizes completely in water i.e. loses all its hydrogen ion (H+) while a weak acid partially ionizes in water.
In the chemical reactions;
1) NH3(g) + H2O(1) → NH4+(aq) + OH (aq)
H20 loses its hydrogen ion (H+) in this reaction to form an anion (OH-). Hence, water (H20) is an acid in this case which ionizes to form a conjugate base (OH-). This is an example of ionization of acid.
2) HF(aq) + H2O(1) → H3O+(aq) + F (aq)
Hydrogen fluoride (HF) loses its hydrogen ion (H+) in the presence of water to form anion (F-). The HF is the acid while F- is it's conjugate base. Thus, an example of ionization of acid
Give the IUPAC name of the given compound.
(CH3)-CH(NH2)-CH3
this compound is called 2-propanamine 2 indicates the position of the amino group propan- indicates the radical (joy123333 do they make anyone a mod?)
what is this stone called? and false answers will be deleted. please help, i am making a pendulum
Answer:
A type of granite?
Explanation:
The photo is a bit hard to see, but I'm guessing, from its smooth edges and the streaky colours that its a type of granite?
Looks like the type of granite used on granite tabletops....
I might be wrong, it's just a guess!
Hope this helped in some way....
Bluey :)
how many molecules of water are present in a 5.65 mole sample of water
Answer:
5.65
Explanation:
Why do we use moles when calculating empirical chemical formulas, but not the mass?
Answer:
because moles is the chemical unit*Avogadro's number, meaning it's the amount of atoms in the given unit.
Explanation:
What causes hydrogen bonding?
bonding of a covalently bonded hydrogen atom with an unshared electron pair
motion of electrons
attraction between ions
sharing of electron pairs between two adjacent hydrogen atoms
Answer:
the tendency of some atoms in molecules to attract electrons more than their accompanying atom.
Explanation:
If it takes 56.7 min for the concentration of a reactant to drop to 18.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1? You do not need to show your work. You can just write the answer in the space provided below
Answer:
0.00302min⁻¹ = k
Explanation:
In a first order reaction the concentration of the reactant decrease following the equation:
ln[A] = -kt + ln[A]₀
ln [A] / [A]₀ = -kt
Where [A] represents actual and initial concentration of the reactant, k rate constant and t time.
As the reactant drop to 18.0% of its initial concentration [A] / [A]₀ = 0.18
And time = 56.7min:
ln [A] / [A]₀ = -kt
ln 0.18 = -k*56.7min
-1.715 / 56.7min = -k
0.00302min⁻¹ = k
Which of the following compounds would be named with a name that ends in -ene?
A. CH3-C triple bond C-CH2-CH2-CH3
B. CH3-CH2-CH2-CH3
C. CH triple bond C-CH2-CH2-CH3
D. CH3-CH2-CH2-CH double bond CH2
Answer:
The answer is option D.
CH3-CH2-CH2-CH=CH2
it's name is Pentene and it's an alkene
Hope this helps you
Consider the following intermediate chemical equations.
2
C(s)+102(g) → CO(g)
CO(g) + 2O2(g) –> C0,00)
How will oxygen appear in the final chemical equation?
O O2(g)
as a product
O2(g)
as a reactant
O(g) as a product
20 (9) as a reactant
Answer:
O2(g) as a product
Explanation:
took the test
The substances which appear on the left hand side of the chemical equation are called the reactants and the products are on the right hand side. Here oxygen appears as a reactant in the final equation. The correct option is B.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. A balanced equation obey the law of conservation of mass.
Here the given two equations are:
C (s) + 1/2 O₂(g) → CO (g)
CO (g) + 1/2 O₂(g) → CO₂ (g)
On adding the above two equations:
C (s) + O₂(g) → CO₂ (g)
So in the final chemical equation, oxygen appears on the reactant side. So oxygen is a reactant.
Thus the correct option is B.
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The given question is incomplete, most probably your full question was:
Consider the following intermediate chemical equations.
C (s) + 1/2 O₂(g) → CO (g)
CO (g) + 1/2 O₂(g) → CO₂ (g)
How will oxygen appear in the final chemical equation?
A. as a product
B. as a reactant
C. as a salt
D. as a mixture
which of the following reaction would result in a decrease in entropy?
Answer:
C
Explanation:
For each reaction, compare molecules of reactant to molecules of product. Decrease entropy means I'm looking for the one that decreases.