Most electric water heaters feature two thermostats: an upper thermostat and a lower thermostat, which are both hidden beneath two control panels.
You should set both thermostats to the same temperature in order to ensure that your electric water heater operates as effectively as possible. At any given time, only one element will be active. An example of a flip/flop system is this. There will always be 120 volts to both elements on a 240 volt water heater. The 240 volts needed to energize the element will be completed by the thermostat by sending the second leg of the 120 volts to the element. Where the burner typically situated at the bottom of the tank, sediment can accumulate over time.
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12) The reaction of 50 mL of C12 gas with 50 mL of CH4 gas via the equation: C12 (g) + CH4 (g) → HCl (g) + CH3C1 (g)
will produce a total of
A) 100
mL of products if pressure and temperature are kept constant.
B) 50
C) 200
D) 150
E) 250
The reaction of 50 mL of C12 gas with 50 mL of CH4 gas via the given equation, will produce a total volume of 100 mL (Option A)
How do I determine the total volume of the products?The total volume of the products can be obtained as illustrated below:
We shall assume the pressure and temperature are kept constant.
First, we shall determine the limiting reactant. This is shown belo:
Cl₂(g) + CH₄(g) → HCl(g) + CH₃Cl(g)
From the balanced equation above,
1 mL of Cl₂ required 1 mL of CH₄
Thus,
50 mL of Cl₂ will also require 50 mL of CH₄
Thus, both reactants are limiting reactants.
Now we shall determine the volume of each products. Details below:
For HCl:
From the balanced equation above,
1 mL of Cl₂ reacted to produce 1 mL of HCl
Therefore,
50 mL of Cl₂ will also react to produce 50 mL of HCl
For CH₃Cl:
From the balanced equation above,
1 mL of Cl₂ reacted to produce 1 mL of CH₃Cl
Therefore,
50 mL of Cl₂ will also react to produce 50 mL of CH₃Cl
Finally, we shall determine the total volume of the products. Details below:
Volume of HCl = 50 mLVolume of CH₃Cl = 50 mLTotal volume =?Total volume = volume of HCl + volume of CH₃Cl
Total volume = 50 + 50
Total volume = 100 mL (Option A)
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In poisoning with HCN nitrates are given with order to
a cyanide antidote if the diagnosis of cyanide toxicity is strongly suspected, without waiting for laboratory confirmation.
What is Cynaide Tocicity?Available antidotes are hydroxocobalamin (Cyanokit) and sodium thiosulfate and sodium nitrite (Nithiodote). Both are given intravenously.
Patients who present with more than minimal symptoms that resolve without treatment should be admitted for observation and supportive care.
In patients with acute poisoning from hydrogen cyanide (HCN) gas or soluble salts, the principal acute care concerns are hemodynamic instability and cerebral edema.
Therefore, a cyanide antidote if the diagnosis of cyanide toxicity is strongly suspected, without waiting for laboratory confirmation.
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What is the first quantum number of a 1 s² electron in phosphorus,
1s²2s²2p 3s²3p³?
A. n = 1
B. n = 2
C. n = 3
D. n = 0
The first quantum number, that is, the principal quantum number of a 1s² electrons is n= 1. Hence, option A is correct.
What is quantum number?Quantum numbers of an electrons represents the allocation of electrons in each orbitals within an atom. There are four different quantum numbers namely, principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number.
No two electrons in an orbital will have same set of these four quantum numbers. The principal quantum number corresponds to the main energy levels represented by the letter n.
n for 1s orbital is always 1. Similarly for a 3s orbital n is 3. Therefore, the principal quantum number of one electron in 1s is n=1.
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How many atoms of potassium make up 1.525 moles of potassium?
Answer:
To find the number of atoms in 1.525 moles of potassium, you can use the formula:
Number of atoms = Number of moles * Avogadro's number
Avogadro's number is a constant that is equal to 6.022 x 10^23 atoms/mole. Plugging in the values for the number of moles and Avogadro's number, you get:
Number of atoms = 1.525 moles * (6.022 x 10^23 atoms/mole)
= 9.149 x 10^23 atoms
Therefore, there are approximately 9.149 x 10^23 atoms of potassium in 1.525 moles of potassium.
According to Avogadro's number there are 9.18×10²³ atoms of potassium which make up 1.525 moles of potassium.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
In the given question number of atoms =number of moles×Avogadro's number=1.525×6.023×10²³=9.18×10²³ atoms .
Thus ,there are 9.18×10²³ atoms of potassium which make up 1.525 moles of potassium.
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Three 15.0 mL acid samples - 0.10 M HA, 0.10M HB, and 0.10 M H2C - are all titrated with 0.100 M NaOH.If HA is a weak acid, HB is a strong acid, and H2C is a diprotic acid, which statement is true of all three titrations?
All three titrations have the same final pH.
All three titrations require the same volume of NaOH to reach the first equivalence point.
All three titrations have the same pH at the first equivalence point.
All three titrations have the same initial pH.
All three titrations require the same volume of NaOH to reach the first equivalence point.
The type of acid used in the titration determines the pH of the result: a strong acid results in a pH of 7 at the titration's equivalent. Equivalence point for a weak acid is influenced by the type of conjugate base and weak acid's beginning pH. The type of the acid is another factor for a diprotic acid.
Thus:
The initial pH of all three titrations is the same, as is the pH at the first equivalence point in all three titrations. Moreover, the final pH of all three titrations is the same. of the three are FALSE.
Thus:
To reach the first equivalence point, all three titrations need the same volume of NaOH.
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If HA is the weak acid, HB is the strong acid, and H₂C is a diprotic acid, the statement is true for the titrations is All three titrations require the same volume of NaOH to reach the first equivalence point.
The pH of the titration is depend on the nature of acid. here the the HA is the weak acid and the HB is the strong acid. the H₂C is the diprotic acid. the diprotic acid means the acid which contains the two hydrogen atoms and will ionized in the water.
Thus, the from all the statements the true one is that All three titrations require the same volume of NaOH to reach the first equivalence point.
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What is the
nature of the
bond indicated
F:
F-S-F
HISIE
C. lonic
F
A. Nonpolar Covalent
B. Metallic
D. Polar Covalent
?
The nature of the bond F-S-F is covalent. Two electrons are shared from the sulfur atom to each F and one electron is shared to S from each F.
What is covalent bond?A covalent bond is formed between two non-metals which are electron deficient. The electrons are shared between each nonmetal atoms. They both combines together to attain octet in their valence shell.
F is 9th element with 7 valence electrons and it need one more electron to achieve octet. Sulfur is 16th element with six valence electrons. Thus, sulfur needs two more electrons in valence shell.
Sulfur needs to bond with two monovalent atoms such as F. Hence, for each F, S shares its two valence electrons and gains two electrons one form each F and form the covalent bond.
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PLEASE HELP
The Indian Ocean is experiencing the loss of coral reefs at an increasing rate. This is due in part to _____ ocean temperatures and increased _____ levels.
A) increased; acid
B) decreased; base
C) decreased; acid
D) increased; base
C) decreased; acid
Coral reefs are sensitive to changes in ocean temperatures and acidity levels, so their health and survival are threatened when the temperatures go down and acidity levels up.
Answer: In bold and underlined
The Indian Ocean is experiencing the loss of coral reefs at an increasing rate. This is due in part to Decreased ocean temperatures and increased Acid levels.
Explanation:Coral reefs are sensitive to changes in ocean temperatures and acidity levels, so their health and survival are threatened when the temperatures go down and acidity levels up.
Calculate the approximate [OH-] in a solution that is 0.200 M in NaF. Ka for HF is 6.7 x 10^-4.
O 1.5 x 10-11 M
12 x 10^-2 M
Correct!
1.7 x 10^-6 M
C3.0 x 10^-12 M
1.3 x 10^-4 M
The [OH-] in a solution that is 0.200 M in NaF. Ka for HF is 6.7 x 10^-4 is 1.73 x 10⁻⁶M . Therefore, option C is correct.
What is the solution ?Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.
A particular kind of homogenous mixture made up of two or more substances is known as a solution. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture.
Given that,
0.200M NaF → 0.200M Na⁺(aq) + 0.200M F⁻(aq)
Na⁺ + H₂O → no reaction because sodium ion will not hydrolyze to form weak electrolyte
F⁻ + H₂O → HF + OH⁻ ( F⁻ hydrolyzes in water to form weak acid HF )
Now, Analysis:
F⁻ + H₂O → HF + OH⁻
C ( i ): 0.200M ------- 0.00M 0.00M
ΔC : -x ------- +x +x
C ( eq ) : 0.200-x ------- x x
~0.200M
Kb = Kw/Ka(HF) = [HF][OH⁻]/[F⁻]
= x²/ ( 0.200 )
= 1x10⁻¹⁴/6.7x10⁻⁴
x = [HF] = [OH⁻]
= √(0.200)(1x10⁻¹⁴)/(6.7x10⁻⁴)
= 1.73 x 10⁻⁶M in OH⁻ ions.
Thus, option C is correct.
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C3H8 + 5O2 → 3CO2 + 4H2O
How many moles of H2O will be created if you burn 1.5 moles of C3H8?
a
6.0
b
0.375
c
0.75
d
2.5
According to the stoichiometry of the given chemical reaction, 2.5 moles of water will be created if you burn 1.5 moles of propane.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given reaction, 44 g of propane gives 72 g water, thus 1.5 moles will give 1.5×72/44=2.45≅2.5
Thus, 2.5 moles of water will be created if you burn 1.5 moles of propane.
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0.030 mol He x22.4 L He
------------ = L He
1 Mol He
The balanced equation of the decomposition of hydrogen peroxide is as follows:
2 H₂O₂ ----> 2 H₂O + O₂0.030 mol He x 22.4 L He = 0.672 L He
What are the products of the decomposition of hydrogen peroxide?
Hydrogen peroxide is a compound of hydrogen and oxygen combined in a ratio of 1 : 1.
The products of the decomposition of hydrogen peroxide are water and oxygen gas. The equation of the decomposition of hydrogen peroxide is given below:
2 H₂O₂ ----> 2 H₂O + O₂
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How many moles of boron are in 4.80 moles of kryptonite?
The number of moles of Boron in 4.80 moles of kryptonite is 14.4 moles of Boron.
The correct option is C.
What are the moles of a substance?The moles of a substance is the amount of that substance that contains as many elementary particles as there are 12 grams of carbon-12 isotope.
The moles of an element in a compound are determined from the mole ratio of the elements in 1 mole of the compound.
Given the formula for Kryptonite, NaLiSiB₃O₇(OH).
There are 3 moles of Boron in 1 mole of Kryptonite.
In 4.8 moles of kryptonite, there will be 4.8 * 3 moles of Boron.
Moles of Boron = 14.4 moles of Boron.
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Complete question:
Jadarite, a.k.a. kryptonite, has a formula of NaLiSiB₃O₇(OH).
How many moles of boron are in 4.80 moles of kryptonite?
A. 4.80 B. 10.8 C. 14.4 D. 1.60 E. 658.4
was added mixtus 31-6g of Potassium pitrate solid was 120 am ³ of water in a plastic beaker. The was stirred gently and the following results. Inital temperature =21-5°C Final temperature =17-0°C a) Calculate the enthalpy change for the reaction. (Density = Iglam³, C² = 4.2jg-1k-1
According to the problem the enthalpy change for the reaction is 742 J.
What is enthalpy?Enthalpy is a thermodynamic quantity that measures the total heat content of a system. It is the sum of the internal energy of the system plus the product of its pressure and volume. In simple terms, it is the total amount of energy contained in a system, including the energy of its components and any energy exchanged with the environment.
The enthalpy change (ΔH) for the reaction can be calculated using the equation:
ΔH = (mass of solution x C² x ΔT) / (density of solution)
Where:
mass of solution = 31.6 g
C² = 4.2 J g-1K-1
ΔT = (21.5 – 17.0) °C = 4.5 °C
density of solution = 1.00 g/cm³
Therefore, ΔH = (31.6 g x 4.2 J g-1K-1 x 4.5 °C) / (1.00 g/cm³)
= 742 J
The enthalpy change for the reaction is 742 J.
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For the reaction C + 2H₂ → CH4, how many moles of carbon are needed to make 129 grams of methane, CH4 ?
0.35 moles of carbon are needed to make 129 grams of methane, CH₄.
What is methane?
Methane is a hydrocarbon gas composed of one carbon atom and four hydrogen atoms. It is the simplest and most abundant form of organic matter found in the environment. It is an odorless and colorless gas, but is often found mixed with other gases that give it a slight smell. Methane is produced naturally by the decomposition of organic matter in the absence of oxygen, such as in wetlands or the intestines of animals. It is also produced by anaerobic bacteria, which break down organic material in the absence of oxygen. It is a major component of natural gas, which is used as a fuel source for cooking and heating. Methane is also a greenhouse gas, meaning it traps heat in the atmosphere and contributes to global warming.
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Please help.The question is in the picture.
The words that fill in the spaces in order are;
a) wavelength
b) crest
c) amplitude
d) trough
What is the wave?Let us now remind ourselves that what we call a wave just have to do with a disturbance that is moving in a medium and has the abilities transfer energy in the medium in which the material is moving. We know that the distance that has been covered by the wave in the horizontal direction is what we can still be able to call the wavelength of the wave.
If we have a sketch of the wave motion, we know that the distance that is found between two successive crests or troughs is what we call the wavelength of the wave and the crests are the top positions while the troughs has to do with the downward positions. The amplitude is the maximum disturbance of the wave.
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A salt shaker contains 8.75 x 1022 formula units of sodium chloride. How many moles is this?
Answer:
[tex]\huge\boxed{\sf No.\ of\ moles = 0.145\ moles}[/tex]
Explanation:
Given data:No. of particles = 8.75 × 10²² units
Avogadro's number = 6.022 × 10²³
Required:No. of moles = ?
Formula:Number of moles = No. of particles / Avogadro's number
Solution:No. of moles = 8.75 × 10²²/6.022 × 10²³
No. of moles = 1.45 × 10⁻¹
No. of moles = 0.145 moles[tex]\rule[225]{225}{2}[/tex]
1. how to prepare pure dry crystals of sodium chloride
salt by using hydrochloric acid and sodium
hydroxide (use thymolphthalein as an indicator)
When solutions of hydrochloric acid and sodium hydroxide react, there is the formation of sodium chloride and water, after the completion of the reaction leaves the solution in a warm place. After the water evaporates and leaves the sparkly crystal of NaCl behind.
What is a neutralization reaction?A neutralization reaction can be defined as a kind of chemical reaction where an acidic solution and a basic solution react with each other to create respective salt and water.
The acidic strength of the resulting solution gives the pH of the neutralized reaction. When a strongly acidic solution reacts with a strongly basic solution the generated salt can be neither acidic nor basic, it's neutral.
When hydrochloric acid (a strong acid) reacts with sodium hydroxide (a strong base), the formed salt is sodium chloride and water.
[tex]HCl + NaOH \longrightarrow NaCl + H_2O[/tex]
The use thymolphthalein indicator, tells about the completion of the reaction. The dry crystals of NaCl can be obtained after the evaporation of water.
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Rutherford's gold foil experiment correctly advanced atomic theory by______________________________________________________.
Rutherford's gold foil experiment correctly advanced atomic theory by showing that the atom is an empty space with a dense positive nucleus.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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Compare the mass of the magnesium strip from test tube 1 with the
initial mass of the same strip measured in task 1, part A. Is the mass the
same, or is it different? If it's different, explain what may have caused
the difference.
The mass of the magnesium strip from test tube 1 is different than the initial mass of the same strip measured in task 1, part A. This difference in mass is likely due to the reaction of the magnesium strip with the hydrochloric acid, which caused the magnesium to dissolve and be converted into magnesium chloride.
What is the magnesium?
Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a silvery-white, light, and ductile metal. Magnesium is a vital component of many biological processes, including photosynthesis and respiration, and is essential for many enzymes, proteins, and cell membranes. Magnesium is also an important component of human nutrition, as it helps to regulate calcium and potassium levels in the body. Magnesium is found in a variety of foods, including green leafy vegetables, nuts, whole grains, and dairy products. Additionally, magnesium can also be found in many dietary supplements. Magnesium deficiency can lead to a number of health problems, including muscle cramps, fatigue, and headaches.
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S + 6 HNO3 H₂SO4 + 6 NO₂ + 2 H₂O
HNO3 to H2O has a stoichiometric ratio of 6:2.
To calculate the moles of HNO3, use 9 grams.
HNO3:H2O 6:2 9 grams/63 grams/mol = 0.143 moles.
0.048 moles of H2O are equal to 0.143*2/6.
water mass =0.048moles*18g/mol=0.864g
0.9 grams, to the closest tenth.
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Correct Question: How many moles of HNO3 required to react completely with 9grams of sulfuric acid?
As 1 g of the radioactive element radium decays over 1 year, it produces 1.16 cross times 10 to the power of 18 alpha particles (helium nuclei). Each alpha particle becomes an atom of helium gas. What is the pressure, in pascal, of the helium gas produced if it occupies a volume of 125 mL at a temperature of 25° C?
The pressure of the Helium gas can be obtained as 0.28 Pa.
What is the pressure?We have to call to mind the Avogadro's law in this case and we would have to make use of the law. Let us note that we have the number of the particles that are present as 1.16 * 10^18 particles
From Avogadro's law;
1 mole of the helium gas contains 6.02 * 10^23 alpha particles
x moles of the helium gas would contain 1.16 * 10^18 particles
x = 1.16 * 10^18 particles * 1 mole/ 6.02 * 10^23 particles
x = 1.9 * 10^-6 moles
We have that;
PV = nRT
P =pressure
V = volume
n = Number of moles
R = gas constant
T = temperature
P = 1.9 * 10^-6 * 0.082 * 298/0.125
P = 3.7 * 10^-4 atm or 0.28 Pa
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100 cm³ of a gas at 740 mm pressure at a certain temperature is taken. What will be the volume of the same mass of gas at 780 mm pressure at the same temperature?
Answer:
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CBSE
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Grade 11
The Gaseous State
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What volume will a gas occupy at 740mm pressure which at 1480 mm occupies 500 cc? Temperaturebeingconstant.
Last updated date: 30th Dec 2022
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Hint: Boyle in the mid 1600’s observed that the product of the pressure and volume of a gas are observed to be nearly constant provided that the temperature is kept constant. This is always true in the case of an ideal gas.
P×V=constant
This relationship between pressure and volume of an ideal gas is known as the Boyle's Law.
Complete answer:
Since it is given in the question that temperature can be assumed as constant, we can apply Boyle’s Law.
According to Boyle's Law we know that:
⇒P×V=constant
We can rewrite this as
⇒P1×V1=P2×V2
Where P1 is the pressure at the volume V1
P2 is the pressure at the volume V2
Thus from the given question we can say that:
P1 = 1480 mm
V1 = 500 cc
P2 = 740 mm
V2 = x
Thus we can rewrite the equation and substitute the above values and obtain the equation given below:
⇒V2=P1×V1P2
⇒V2=1480×500740
⇒V2=1000cc
Thus the volume of gas occupied at a pressure of 740 mm is 1000 cc.
how many atoms are in 5.7 g of helium?
Answer:
3.5*1024
Explanation:
3584
(c) What is the volume of 4 kg of water in liters?
Answer:
[tex]\huge\boxed{\sf v = 0.004\ m\³}[/tex]
Explanation:
Given Data:Mass = m = 4 kg
Density of water = 1000 kg/m³ (Standard)
Required:Volume = v = ?
Formula:Density = m/v
Solution:1000 = 4 / v
Multiply v to both sides1000 × v = 4
Divide both sides by 1000v = 4/1000
v = 0.004 m³
[tex]\rule[225]{225}{2}[/tex]
Copper metal can be produced commercially through a single replacement reaction of aluminum metal and copper (II) chloride. How many grams of aluminum are required to react with 10.05 moles of copper (II) chloride?
Answer:180.9g
Explanation:
Balance Chemical Reaction can be written as:
2Al + 3CuCl2→2AlCl3+Cu
2 mol aluminium reacts with 3mol copper chloride
therefore,
10.05moles copper chloride require=2*10.05/3 mol aluminium
=6.7mol aluminium
now, we know that 1 mol aluminium contains 27g mass
, therefore,6.7mol aluminium=6.7*27=180.9g aluminium
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When thermal energy is removed from a system, what happens to the temperature and the average kinetic energy of the system?
Temperature decreases, average kinetic energy increases
Temperature decreases, average kinetic energy decreases
Temperature increases, average kinetic energy increases
O Temperature increases, average kinetic energy decreases
Answer:
When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop.
Explanation:
MAKE SURE TO REPHRASE
Which element is oxidized in this reaction?
Zno+C →Zn + Co
Enter the chemical symbol of the element.
View Available Hint(s)
C is oxidized.
Correct
Carbon gets oxidized in the process of reducing zinc. Zinc gets reduced in the process of oxidizing carbon.
Part B
Which substance is the oxidizing agent in this reaction?
Zno+C →Zn + Co
Express your answer as a chemical formula.
View Available Hint(s)
Part C
Which element is reduced in this reaction?
Cr₂O₇² +3HNO₂+5H+→ 2Cr³+ 3NO₃ +4H₂O
Enter the chemical symbol of the element.
View Available Hint(s)
Cr is reduced
Correct
Nitrogen gets oxidized in the process of reducing chromium. Chromium gets reduced in the process of oxidizing nitrogen.
Part D
Which substance is the reducing agent in this reaction?
Cr₂O₇² +3HNO₂+5H+→ 2Cr³+ 3NO₃ +4H₂O
Express your answer as a chemical formula.
View Available Hint(s)
The element which is oxidized in the reaction; ZnO + C → Zn + CO is carbon.
The oxidizing agent in the reaction is ZnO.
The element which is reduced in the reaction; Cr₂O₇²⁻ + 3 HNO₂ + 5H⁺ → 2Cr³⁻ + 3 NO₃ + 4 H₂O is chromium.
The reducing agent in the reaction is HNO₂.
What are oxidation and reduction reactions?Oxidation reactions are reactions in which there is a loss of electrons or in which oxygen is added to an element.
Reduction reactions are reactions in which there is a gain of electros or in which oxygen is removed from an element.
Reducing agents are substances that undergo oxidation whereas, oxidizing agents are substances that are reduced.
In the equation of reaction shown below:
ZnO + C → Zn + CO
Carbon gets oxidized in the process of reducing zinc. Zinc gets reduced in the process of oxidizing carbon.
In the equation of reaction shown below:
Cr₂O₇²⁻ + 3 HNO₂ + 5H⁺ → 2Cr³⁻ + 3 NO₃ + 4 H₂O
Nitrogen gets oxidized in the process of reducing chromium. Chromium gets reduced in the process of oxidizing nitrogen.
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What makes a nucleus unstable?
A. There are too few quarks to make the protons and neutrons.
B. The force of gravity on the mass in the nucleus makes it unstable.
C. The strong nuclear force doesn't balance the electrostatic force.
D. The attraction between protons and electrons pulls the nucleus
apart.
SUBMIT
Answer: the attraction between the protons and neutrons pulls the nucleus apart
Explanation: but also it is because of the fact that protons repel each other, and even though the neutrons hold the protons together in the nucleus, it has been theorized that eventually you will reach "critical mass" where you cannot make a nucleus any bigger, no matter how many neutrons you add.
We cannot identify an acid with phenolphathalein.Why?
Explanation:
phenolphthalein changes colour from transparent to pink in a basic solution. but in an acidic or a neutral solution it does not change colour. so if you put an unknown solution in phenolphthalein and it does not change colour then you cannot infer if it is acidic or neutral in nature.
Bond Order of O2^-2 and N2^+2
Help please!
O2 and O2- are paramagnetic because they have unpaired electrons in their anti-bonding orbitals, and O2-2 has an odd bond order, or 1. Bond order of N2^+2 is 1.
What is bond order ?According to Linus Pauling's definition, bond order is the difference between the number of bonds and anti-bonds. The number of electron pairs between two atoms determines the bond order. For instance, the bond order between the two nitrogen atoms in diatomic nitrogen, NN, is 3.
The bond order is NOT 1 bond followed by 2 bonds. Recall that resonance displays the extremes that should be averaged to get a more accurate image of bonding. The bond order is 1.5 for each of the two identical bonds. Overall, there are three bonds.
Thus, O2-2 has an odd bond order, or 1. Bond order of N2^+2 is 1.
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Which compound includes a polyatomic ion that contains oxygen?
tin(II) chloride
hydrochloric acid
lithium carbonate
dinitrogen trioxide
The compound includes a polyatomic ion that contains oxygen is lithium carbonate. Therefore, option C is correct.
What is polyatomic ion ?The term polyatomic ion is defined as ions which consist of more than one atom. Polyatomic ions are formed by covalent bonds, especially coordinate covalent bonds.
The polyatomic ions have a net charge on them. Only a few of the elements on the periodic table have a second letter that is lowercase after their initial capital letter.
Thus, The compound includes a polyatomic ion that contains oxygen is lithium carbonate, option C is correct.
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