Answer:
catalyst
Explanation:
Which compounds give one singlet in the 1H NMR spectrum? CH3CH3 1461113dichloro22dibromo 1461123dimethyl2butene CH3―C≡C―CH3 CH2═CHCH═CH2 14611cyclohexadione 14611cyclopentane 14611123tribromopropane 14611ketone 14611ester
Answer:
CH3CH3, 1,3- dichloro-2,2- dibromo, 2-butyne, cyclopentane, 2,3- dimethylbut-2-ene, 2,2,4,4- tetramethlpenta-3-one.
Explanation:
This problem or question has to do with spectroscopy. Spectroscopy is one of the Important aspect of physical Chemistry. It is important because it helps in the identification of chemical samples or compounds. The Nuclear Magnetic field work generally on the principle of absorption of energy.
The following compounds as given in the question above shows singlet in the 1H NMR spectrum.
(1). CH3CH3: shows singlet in the 1H NMR spectrum at 0.86 ppm.
(2). 1,3- dichloro-2,2- dibromo; shows singlet.
(3). 2- butyne shows singlet
(4). Cyclopentane shows singlet.
(5). 2,3 - dimethylbut-2-ene shows singlet.
(6). 2,2,4,4- tetramethlpenta-3-one shows singlet.
Kindly note that I have used the IUPAC naming system to name the Compounds in the question above.
A cesium sulfate solution reacts with barium bromide solution to produce a precipitate of barium sulfate and a solution of cesium bromide. Write the molecular equation for this reaction. part 1 - (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.) part 2-Write the corresponding net ionic equation. (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
Answer:
molecular eq.
Cs2SO4 (aq) + BaBr2(aq) → BaSO4(s) + 2CsBr(aq)
ionic eq.
SO₄²-(aq) + Ba^+2 (aq) → BaSO4 (s)
explanation
separate the ions
Cs₂^+1(aq) + SO₄^+2(aq) + Ba^+2(aq) + Br₂^-1(aq) → BaSO₄(s) + 2Cs(aq) + Br(aq)
than simplify it
SO₄²-(aq) + Ba^+2 (aq) → BaSO4 (s)
When sound molecules stack up" in front of high-speed flights, what could
happen?
Answer: The added pressure could cause pilots to become disorinated
Explanation:
Answer:
When sound molecules stack up in front of high-speed flights, loud noises are produced that can damage the ears.
Use the periodic table to answer the following questions. How many valence electrons does oxygen have?
Answer:Oxygen has 6 valence electrons
A=2
B=2
C=4
The charge of an oxygen Ion is -2
Explanation:
According to the electronic configuration,there are 6 valence electrons in an oxygen atom.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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help me with this
hurricans are most likely to hit the gulf of Mexico and the Caribbean is this classified as weather or climate please answer
Answer
Climate, because this describes what the weather is like over a long period of time.
a compound X is formed by an element y which is in the form of pellet. The compound X is also the product of chlor - alkali process. Identify X and Y
Answer:
X is sodium hydroxide (caustic soda, NaOH)
y is sodium (Na)
Explanation:
The process of industrial electrolysis of sodium chloride solution by which chlorine and sodium hydroxide (caustic soda) can be produced is known as the chlor-alkali process as follows;
2NaCl + 2H₂O → Cl₂ + H₂ + 2NaOH
Given that the compound X is formed from a element y which is in the form of a pellet, we have;
The element in the above reaction that can exist as pellet is the silver white metallic sodium pellet
Therefore, the compound X is NaOH and the element y is sodium, Na.
DNA Mutations
Pre-Test
Active
1
A mutation causes a dog to be born with a tail thatis shorter than normal.
Which best describes this mutation
Answer:
Explanation:
A
2. When dividing the measurements 400 g/32.2 cm3, the answer has__
significant figures.
Answer:
When dividing the measurements 400 g/32.2 cm³, the answer has 3
significant figures.
Explanation:
400 g/32.2 cm³ = 12.422 g/cm³.
Our answer cannot have more significant figures than the number with the least significant figures. Since both the numerator and denominator have 3 significant figures, our answer will also have 3 significant figures.
So 400 g/32.2 cm³ = 12.4 g/cm³ to 3 significant figures
So, when dividing the measurements 400 g/32.2 cm³, the answer has 3
significant figures.
Why was Niels Bohr atomic model superior to all the earlier models
Answer:
because it showed how the electron could orbit the nucleus without falling into it.
Study the reactions for the formation of compounds from their elements. I. C(s) + O2(g) → CO2(g) ΔHf = −394 kJ II. H2(g) + 12O2(g) → H2O(l) ΔHf = −242 kJ III. 2C(s) + 3H2(g) → C2H6(g) ΔH =−84 kJ The combustion of C2H6 is shown by the following equation: C2H6(g) + 72O2(g) → 2CO2(g) + 3H2O(l) Which option correctly gives the enthalpy of combustion of 0.2 moles of C2H6(g)? −1,430 kJ 286 kJ −286 kJ 1,430 kJ Exam 3 Click on the numbers to jump from one question to another. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Answer:
The correct option is -286 kJ
Explanation:
The given parameters are
C(s) + O₂(g) → CO₂(g) ΔHf = -394 kJ
H₂(g) + 12O₂(g)→H₂O ΔHf = -242 kJ
2C(s) + 3H₂(g)→C₂H₆(g) ΔH = -84 kJ
Te given equation is C₂H₆(g) + 7/2O₂(g) →2CO₂(g) + 3H₂O(l)
The heat of formation or enthalpy of combustion = Heat of formation of the products - Heat of formation of the reactants
The enthalpy of combustion of the reaction = 2*(-394) + 3*(-242)- ((-84)+7/2*0)) = -1,430 kJ
Given that the reaction consists of one mole of C₂H₆(g), we have;
The enthalpy of combustion of one mole of C₂H₆(g) = -1,430 kJ
Therefore, the enthalpy of combustion of 0.2 mole of C₂H₆(g) = -1,430 kJ × 0.2 = -286 kJ
The correct option = -286 kJ.
Answer:
Positive 1,430
Explanation:
please help pls help 20 points Which of the following is a myth about water conservation? An important part of water conservation is preventing water pollution. Using an electric clothes dryer conserves more water than air-drying clothes. Buying bottled water does not conserve more water than drinking from the tap. A front-loading washing machine uses less water than a top-loading washing machine.
Answer:
Air-drying clothes conserves more water than using an electric clothes dryer.
Which form of energy does a battery-powered flashlight receive as an input?
Answer:
chemical energy
Explanation:
A battery stores energy in the form of chemical energy. Chemical energy is stored in the bond of atoms and molecules. These bonds break and convert to other forms of energy. In the given case, the chemical energy is converted to electric energy which powers the flashlight. Thus, flashlight receives energy input in the form of chemical energy.
Sodium azide nan3 is dissolved in water. Acidified silver nitrate is added to the solution and a white precipitate forms. Aqueous ammonia is then added to the solution and a white precipitate forms. Aqueous ammonia is then added to the white precipitate. The azide ion n3- has similar chemical properties to the cl- ion. What is the formula of the ppt formed and what is the observation on adding aqueous ammonia?
Answer:
The formula of the precipitate formed is AgN₃ (Silver azide).
On adding aqueous ammonia to the precipitate formed, the precipitate dissolves due to the formation of a soluble complex compound with aqueous ammonia.
Explanation:
Sodium azide is NaN₃
Silver Nitrate is AgNO₃
The two of them react and theres a double displacement where the ions exchange radicals.
NaN₃(aq) + AgNO₃(aq) → NaNO₃(aq) + AgN₃(s)
The azide ion (N₃⁻), which has very similar chemical properties as the chloride ion (Cl⁻), also forms an insoluble compound with Silver.
And just like AgCl, the precipitate (AgN₃) also dissolves when ammonia is added by forming a soluble complex.
AgN₃(s) + 2NH₃(aq) → [Ag(NH₃)₂]N₃(aq)
Hope this Helps!!!
(xiii)
Which element is an inert gas?
Answer:
All the noble gases are least reactive so noble gases are called inert gases.....Sabiendo el número atómico del titanio y además que su número másico es 48, ¿cuál es la cantidad de protones, neutrones y electrones respectivamente? *
Answer:
# protones: 22
# neutrones: 26
# electrones: 22
Explanation:
El número atómico del titanio es 22. Este número atómico representa la cantidad de protones del átomo en cuestión. Así:
# protones: 22.
El número másico se define como la suma de protones y neutrones, así:
48 = 22 + # neutrones
26 = # neutrones
Un átomo es neutro, esto quiere decir que sus cargas positivas y negativas son iguales (Protones: cargas positivas; Electrones: Cargas negativas).
Así, el # protones = # electrones = 22
Which interaction contributes to the greenhouse effect? Gases in the atmosphere absorb heat. Dust particles scatter and reflect light from the Sun. Green visible light is trapped in Earth’s atmosphere. Light travels through a thick part of the atmosphere at sunrise and sunset.
Answer:Gases in the atmosphere absorb heat.
Explanation: :) edge2020
Gases in the atmosphere absorb heat is the interaction that contributes to the greenhouse effect.
• The solar energy captivated at the surface of the Earth is radiated back to the atmosphere in the form of heat. The greenhouse gases absorb the majority of this heat.
• The greenhouse gases are the complex molecules in comparison to other gases present in the atmosphere, they comprise the composition, which captivates heat.
• These gases radiate the heat back to the surface of the Earth, to another molecule of greenhouse gas and thus contributing to greenhouse effect.
• There are many kinds of greenhouse gases, of them the major ones are the carbon dioxide, methane, and nitrous oxide.
Thus, the statement, that is, gases in the atmosphere absorb heat is correct.
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What are the masses of subatomic particles in their atomic mass unit
Answer:
Subatomic particles are the proton (1 amu), neutron (1 amu), and electron (0 amu)
Explanation:
Atomic mass unit (amu; dalton): A unit of mass equal to exactly 1/12 the mass of one 12C atom, or 1.660538921 x 10−27 kg. This is the approximate mass of one proton or one neutron. It is the basis of atomic weights.
Answer:
[tex]\boxed{\mathrm{see \: below}}[/tex]
Explanation:
Protons have a mass of 1 amu (atomic mass unit).
Electrons have a mass of [tex]\frac{1}{1840}[/tex] amu (atomic mass unit).
Neutrons have a mass of 1 amu (atomic mass unit).
give an example of process you notice or use each day that obeys the law of conservation of mass. and explain how this process works
Answer:
Cellular respiration:
[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]
Explanation:
Hello,
In this case, the law of conservation of mass states that matter cannot be created nor destroyed but modified, therefore, typical examples are the raft chemical reactions in nature or carried out in a laboratory. Thus, a typical one that could be daily found is in the cellular respiration wherein glucose and oxygen are converted into carbon dioxide, water and energy for us to use it in our daily activities. It is chemically represented by:
[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]
Law of conservation of mass is verified as six carbon atoms are before and after the chemical reaction, twelve hydrogen atoms are before and after it and eighteen oxygen atoms as well.
Best regards.
What is a pH in biology?
Answer:
pH is a scale used to specify the acidity or basicity of an aqueous solution. Lower values correspond to solutions which are more acidic in nature, while higher values correspond to solutions which are more basic or alkaline.
Explanation:
Answer: “pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term, widely used in chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ion—which ordinarily ranges between about 1 and 10−14 gram-equivalents per litre—into numbers between 0 and 14.” - my science teacher I don’t know where she gets her notes from
Explanation:
Which of the following questions can be answered by science? What is the composition of air? Should the driving age be reduced? What is the purpose of our existence on Earth? Should students be allowed to bring toys to school?
Your answer is A. What is the composition of air?
The question that can be answered by science is What is the composition of air? The correct option is A.
What is science?Science is a subject that deals with the components of the earth. It has a wide variety of components of earth. Like planets and meteorites. Plants, animals, and other creatures. Nature, trees, and other abiotic factors.
Science gives answers to the secrets of the earth, and they unravel the mysteries of nature and the earth. They solve the mysteries of air, water, and other natural processes.
So the composition of air can be told by science. The air is made up of a mixture of gases. Air is present in the atmosphere. It is needed for breathing, and it is an important component of life because it provides oxygen to the body.
The correct option is A. What is the composition of air?
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What is the number of molecules of 140 g of CO?
Answer:
3.01
[tex] \times [/tex]
10-22
moles=mass/RMM
moles=140/28
=5moles
1mole=6.02*10-23
5moles=?
=3.01*10-22
hope this is helpful
The greater the amount of _____ released, the stronger the acid. H+ OH- Ka pH
Answer:H+(protons)..
Earth's gravitational potential energy: GPE = mgh = Gravity (9.81m/s2) *
Mass (kg) x Height (m)
Kinetic energy: KE= Imov?
How do the mass and speed of an object affect the kinetic energy?
Answer:
as mass and the square of speed is directly proportional to the the kinetic enegry so, more there will be mass and speed there will be more kinetic enegry.
What is the valence shell electronic configuration of Alkali Metals , Alkaline Earth Metals, Halogens and Noble Gases?
Answer:
alkali metals: 1
alkaline earth metals: 2
Halogens: 7
noble gases : 8
Answer:
Alkali Metals: 1 valence electron
Alkaline Earth metals: 2 valence electrons
Halogens: 7 Valence electron
Noble Gases: 8 Valence electrons
Humans are not the only animals that pollute the air.
Please select the best answer from the choices provided
F T
Answer:
TRUE
Explanation:
Humans and many animals are responsible for air pollution. Even natural processess such as excreting feces results in release of methane, CO2 etc which contribute to air pollution
Humans are not the only animals that pollute the air. This statement is True.
What is air pollution ?Substance that alters the natural properties of the atmosphere, whether it be chemical, physical, or biological, is considered an air pollutant. Air pollution can occur inside or outdoors. Common causes of air pollution include motor vehicles, industrial operations, household combustion appliances, and forest fires.
Although there are certain natural processes that can produce air pollution, such as sulfur and chlorine gases from volcanic activity, smoke and ash from wildfires, dust storms, and biological degradation, manmade causes account for the majority of pollution in the atmosphere.
Particles that are both solid and liquid, as well as certain gases that are suspended in the air, are what produce air pollution. These gases and particles can be produced by industries, volcanoes, wildfires, dust, pollen, and vehicle and truck emissions.
Thus, Humans are not the only animals that pollute the air. This statement is True.
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write these numbers rounded to the three nearest significant figures
Answer:
(a) 52.2 mL helium
(b) 18.0 g nitrogen
(c) 78.5 mg MSG
(d) 23,600,000 mm wavelength
(e) 0.00420 kg lead
Rounded the numbers to three nearest significant figures.
Entropy can be thought of as the degree of disorganization of a system.
TRUE
FALSE
Answer:
True
Explanation:
The entropy of a system denoted by S is a thermodynamic function that increases in value when there are more ways to arrange the particles in the system. Some spontaneous chemical processes are entropy driven. An increase in entropy is said to drive the dissolution of ionic salts along with the evaporation of water are related to the spreading out of energy.
The entropy of a system can be taken as a measure of disorder of a system. In a spontaneous chemical process, the entropy of the universe is said to increase. ΔSunivu>0. Making the answer true.
Why crystallization technique is preferred over evaporation?
Answer:
Pure crystals of the substance of interest are recovered using crystalization
It can be used to obtain substances that decompose on heating.
Explanation:
Crystalization is the process of converting a liquid solution to a crystalline solid. It is a common method of extracting the solid product of a reaction from solution. It can also be a separation method especially for obtaining pure crystals from a solution.
Crystalization does not require heating. Common methods of inducing crystalization include; addition of crystals of the same substance as seeds or scratching the vessel containing the solution.
The advantage of crystalization over evaporation is that it can be used to recover substance that decompose on heating. Also crystalization yields pure crystals of the substance of interest compared to evaporation in which soluble impurities may not be completely removed.
25cm3 of 0.2mol/dm3 barium hydroxide solution reacted with 22.8cm3 hydrochloric acid. Calculate the concentration of the hydrochloric acid in mol/dm3. Ba(OH)2 + 2HCl BaCl2 + 2H2O
Explanation:
1 mol of Ba(OH)2 = 2 moles of HCl
What byproduct of nuclear energy has caused concerns about the use of this resource and why?
Answer:
Byproduct of Nuclear Energy: Nuclear Waste
Explanation:
Nuclear waste has caused plenty of concern over the health of humans and the environment. Since nuclear wastes can last for hundreds of years, it is difficult to find areas where we can store it. Nuclear waste is toxic to humans and the environment, and I believe even some are even radioactive. The byproduct is buried deep underground surrounded by cement and concrete but can still leak through.