Which structure corresponds to the predominant form of this molecule near ph 7?
Answers
at pH 7 alanine molecule lose one proton from its carboxylic acid group and this proton is added to its amino group
This structure is called Zwitter ion (which contain equal number of positive and negative charges)
At a neutral pH of 7, the amino acid exists in the zwitterionic form, with a positive charge on the nitrogen of the amino group and a negative charge on the oxygen of the carboxyl group. This is due to the molecule's ability to accept or donate protons.
Explanation:The structure of a molecule at a certain pH is affected by the molecule's ability to accept or donate protons. Amino acids, which are the molecule in question here, contain both carboxyl (-COOH) and amino (-NH2) groups. These groups can either donate or accept protons, depending on the pH of the environment.
At a pH less than 7, the environment is acidic and has a high concentration of protons. The carboxyl group tends to donate a proton and exist as COO-, while the amino group attracts protons and forms NH3+.
At pH 7, the environment is neutral. In this condition, amino acids usually exist in the zwitterionic (dipolar) form, where the carboxyl group is COO- and the amino group is NH3+.
At pH greater than 7, the environment is basic with a lower concentration of protons. Here, the amino group tends to donate a proton and exist mostly as NH2, while the carboxyl group remains COO-.
So, at pH 7, the predominant form of an amino acid would be the zwitterionic form, with a positive charge on the nitrogen of the amino group and a negative charge on the oxygen of the carboxyl group.
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Related Questions
What is studied in the field of thermodynamics?
A. The properties of chemical solutions
B. The laws of gravitational motion
C. The particle nature of light waves
D. The movement of energy and heat
Answers
Thermodynamics is the study of the movement of energy and heat. Therefore, the correct option is option D.
What is thermodynamics?The science of thermodynamics examines how heat, work, temperature, or energy are related. The general topic of thermodynamics is the movement of energy through one location or form to another.
Before around 1798, when British military engineer Count Rumford discovered that endless quantities of heat could be produced while boring cannon barrels as well as that the amount of heat produced is proportional towards the work done while having to turn a blunt boring tool, heat was not formally understood to be a type of energy. Thermodynamics is the study of the movement of energy and heat.
Therefore, the correct option is option D.
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What is the total number of atoms contained in 2.00 moles of nickel?
Answers
that is 1 mole = 6.02 x10^23 atoms
what about 2 moles = ? atoms
= ( 2moles /1mole) x 6.02 x10^23 atoms = 1.204 x10^24 atoms of nickel are there in 2 moles of nickel
The total number of atoms contained in 2.00 moles of nickel is 1.204 × 10²⁴ atoms
HOW TO CALCULATE NUMBER OF ATOMS:
The number of atoms in an element can be calculated by multiplying the number of moles by Avogadro's number. That is;no. of atoms = no. of moles × 6.02 × 10²³According to this question, there are 2 moles of nickel (Ni). The number of atoms can be calculated as follows:no. of atoms = 2 × 6.02 × 10²³no. of atoms = 12.04 × 10²³no. of atoms = 1.204 × 10²⁴ atomsTherefore, the total number of atoms contained in 2.00 moles of nickel is 1.204 × 10²⁴ atoms.Learn more at: https://brainly.com/question/22552359?referrer=searchResults
What mass of h2o is formed when h2 reacts with 384 grams of o2?
Answers
Chemical reaction: 2H₂ + O₂ → 2H₂O.
m(O₂) = 384 g.
M(O₂) = 2 · 16 g/mol = 32 g/mol, molar mass.
n(O₂) = m(O₂) ÷ M(O₂).
n(O₂) = 384 g ÷ 32 g/mol.
n(O₂) = 12 mol, amount of substance.
From chemical reaction: n(O₂) : n(H₂O) = 1 : 2.
n(H₂O) = 12 mol · 2 = 24 mol.
m(H₂O) = n(H₂O) · M(H₂O).
m(H₂O) = 24 mol · 18 g/mol.
m(H₂O) = 432 g.
A 3.5 gram sample of a radioactive element was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific test site. The half-life of the radioactive element is 28 years. How much of the original sample will remain in the year 2030? Show your work.
Answers
Solution:
From year 1960 to year 2030, it has been
2030-1960 = 70 years
The half-life of the radioactive element is 28 years, then the sample will go through
70 years * (1 half-life/28 years) = 2.5 half-lives
Starting with a 3.5 gram sample, we will have
3.5*(1/2) after one half-life passes
3.5*(1/2) * (1/2) = 3.5*(1/4) after two half-lives pass
3.5*(1/4) * (1/2) = 3.5*(1/8) after three half-lives pass and so on
Therefore, we can write the remaining amount of the sample after the number n of half-lives have passed as
mass of sample = initial mass of sample/2^n
The mass of the remaining sample for n = 2.5half-lives can be now calculated as
mass of sample = 3.5 grams / 2^2.5 = 0.62 g
What is the ratio of carbon atoms to hydrogen atoms in a saturated cyclic hydrocarbon?
Answers
1:2
ahh but why you may ask?
because there's 1 carbon bonded with 2 hydrogens.
the simplest answer,
because chemistry.
Explanation:
A saturated hydrocarbon is defined as the hydrocarbon in which there are only single bonds between the combining atoms.
On the other hand, a cyclic hydrocarbon is a ring structure in which hydrogen and carbon atoms are joined together.
Hence, a saturated cyclic hydrocarbon is a ring structure of hydrogen and carbon atoms joined together through single bonds only.
In a saturated cyclic hydrocarbon molecule, each carbon atom is bonded with two hydrogen atoms.
Therefore, we can conclude that the ratio of carbon atoms to hydrogen atoms in a saturated cyclic hydrocarbon is 1:2.
Describe what a polar covalent bond is and name a common compound that has a polar covalent bond holding it together
Answers
Certain high-frequency radiations are likely to cause harm to astronauts landing on Mars. A detector for which type of electromagnetic radiation is most suitable to study this harmful radiation on Mars? Infrared Radio waves Ultraviolet Visible light
Answers
that's wrong. I'm not sure but I think it might be ultraviolet.
Answer:
Ultraviolet
Explanation:
Given the options: Infrared, Radio waves, Ultraviolet and Visible light, ordering them by frequency (for highest to lowest) we get:
Ultraviolet
Visible light
Infrared
Radio waves
Knowing that high-frequency radiations are likely to cause harm to astronauts landing on Mars, then the detector of Ultraviolet is most suitable
A gas occupies a volume at 34.2 mL at a temperature of 15.0 C and a pressure of 800.0 torr. What will be the volume of this gas at STP?
Answers
Solution:
Assuming ideal behavior of gases, we can use the universal gas law equation
P1V1/T1 = P2V2/T2
The terms with subscripts of one represent the given initial values while for terms with subscripts of two represent the standard states which is the final condition.
At STP, P2 is 760.0torr and T2 is 0°C or 273.15K. Substituting the values to the ideal gas expression, we can now calculate for the volume V2 of the gas at STP:
(800.0torr * 34.2mL) / 288.15K = (760.0torr * V2) / 273.15K
V2 = (800.0torr * 34.2mL * 273.15K) / (288.15K * 760.0torr)
V2 = 34.1 mL
PV = nRT
where
P - pressure - 800.0 torr x 133.3 Pa/torr = 106 640 Pa
V - volume - 34.2 x 10⁻³ m³
n - number of moles
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature in Kelvin - 15 °C + 273 = 288 K
substituting these values in the equation
106 640 Pa x 34.2 x 10⁻³ m³ = n x 8.314 Jmol⁻¹K⁻¹ x 288 K
n = 1.52 mol
molar volume is where 1 mol of any gas occupies a volume of 22.4 L at STP
therefore if 1 mol occupies - 22.4 L
then 1.52 mol occupies - 22.4 L/mol x 1.52 mol = 34.05 L
volume of the gas at STP is 34.05 L
Which two pieces of data indicate that Jupiter resides in the outer region of the solar system?
It is primarily composed of hydrogen and helium.
It contains one natural satellite, the Moon.
It is the hottest planet in the solar system.
Its surface gases form into colorful bands.
It has a metal surface upon which one can stand.
Answers
Answer: The correct statements are it is primarily composed of hydrogen and helium and its surface gases form into colorful bands.
Explanation:
There re two types of planets in Our solar system:
1. Inner planets: There are 4 inner planets which are Mercury, Venus, Earth and Mars. These planets have a rocky surface. They revolve in less time around the Sun. The number of satellites that these planets have are less (at max two). As, these planets lie close to Sun, thus they are hotter than the outer ones.
2. Outer planets: There are 4 inner planets which are Jupiter, Saturn, Uranus and Neptune. These planets have a gaseous surface. They take more time to revolve around the Sun. These planets have many satellites. As, these planets lie far from the Sun, thus they are colder than the inner ones.
Jupiter is the 5th planet in Our solar system. The atmosphere of Jupiter is the mostly made up of Hydrogen and Helium with trace amounts of ammonia, water, methane and other carbon compounds. The clouds of ammonia present in Jupiter's atmosphere are carried by the jet streams. This results in the formation of Jupiter's colored bands, which are shades of white, red, orange, brown and yellow.
Hence, the correct statements are it is primarily composed of hydrogen and helium and its surface gases form into colorful bands.
The two pieces of data indicate that Jupiter resides in the outer region of the solar system is A. It is primarily composed of hydrogen and helium and D. Its surface gases form into colorful bands.
Jupiter's composition of hydrogen and helium, and its colorful bands indicate that it resides in the outer region of the solar system.
These features differentiate it from the rocky planets in the inner solar system.To determine which two pieces of data indicate that Jupiter resides in the outer region of the solar system, the correct options are:
It is primarily composed of hydrogen and helium.Its surface gases form into colorful bands.These features, especially being composed of hydrogen and helium, are characteristic of the gas giants in the outer solar system.Additionally, Jupiter's colorful bands are a result of its atmospheric conditions, which are different from the rocky surfaces of inner planets.
Correct question is: Which two pieces of data indicate that Jupiter resides in the outer region of the solar system?
A. It is primarily composed of hydrogen and helium.
B. t contains one natural satellite, the Moon.
C. It is the hottest planet in the solar system.
D. Its surface gases form into colorful bands.
E. It has a metal surface upon which one can stand.
How does the total volume of gas particles compare to the volume of the space between gas particles?
Answers
There is more space between gas particles than the size of the particles.
Explanation:
This scenario can be understand by taking a very simple example. As we know that 1 mole of any gas at standard temperature and pressure occupy 22.4 liters of volume. Lets take Hydrogen gas and Oxygen gas, 1 mole of each gas will occupy same volume. Why it is so? Why same volume although Oxygen is 16 times more heavier? This is because the space between gas molecules is very large. Approximately the distance between gas molecules is 300 times greater than their own diameter from its neighbor molecules.
if 1.20 moles of copper react with mercuric nitrate how many moles of mercury form
Answers
To determine the number of moles of mercury formed when 1.20 moles of copper react with mercuric nitrate, you need to examine the balanced chemical equation. For every 2 moles of copper that react, 2 moles of mercury are formed. Therefore, if you have 1.20 moles of copper, you will also have 1.20 moles of mercury formed.
Explanation:In order to determine the number of moles of mercury formed when 1.20 moles of copper react with mercuric nitrate, you need to examine the balanced chemical equation for the reaction. The balanced equation is:
2Cu + Hg(NO3)2 → 2Hg + 2Cu(NO3)2
From this equation, you can see that for every 2 moles of copper (Cu) that react, 2 moles of mercury (Hg) are formed. Therefore, if you have 1.20 moles of copper, you will also have 1.20 moles of mercury formed in the reaction.
Given the balanced equation for the reaction of copper with mercuric nitrate, 1.20 moles of copper will produce 1.20 moles of mercury.
Given the reaction between copper and mercuric nitrate, we can use stoichiometry to determine the moles of mercury produced. The balanced chemical equation for this type of reaction is:
Cu + Hg(NO₃)₂ → Cu(NO₃)₂ + Hg
From this equation, we see that 1 mole of copper (Cu) reacts with 1 mole of mercuric nitrate (Hg(NO₃)₂) to produce 1 mole of mercury (Hg).
Since we have 1.20 moles of copper reacting, we can directly infer that:
1.20 moles of Cu → 1.20 moles of Hg
Identify the balanced chemical reaction: Cu + Hg(NO₃)₂ → Cu(NO₃)₂ + HgDetermine the mole ratio between copper and mercury from the balanced equation (1:1).Using this ratio, 1.20 moles of copper will produce 1.20 moles of mercury.How many grams of sodium chloride are required to prepare 500.0 ml of a 0.100 m solution?
a.1.46 g strike reset
b.2.93 g strike reset
c.29.3 g strike reset
d.58.5 g strike reset?
Answers
molarity of solution to be prepared is 0.100 M
volume of solution to be prepared is 500.0 mL
the number of moles in 1 L - 0.100 mol
therefore number of moles in 500.0 mL - 0.100 mol/L x 500.0 x 10⁻³ L = 0.0500 mol
mass of NaCl required - 0.0500 mol x 58.5 g/mol = 2.925 g
mass of NaCl needed is therefore 2.93 g
answer is B. 2.93 g
In order to prepare 500.0 mL of a 0.100 M NaCl solution, 2.93 g of sodium chloride are required (Option b).
What is molarity?Molarity is the number of moles of solute per liters of solution.
We have 500.0 mL of a 0.100 M NaCl solution. First, we will calculate the moles of solute using the definition of molarity.
M = moles solute / liters solution
moles solute = M × liters solution
moles solute = 0.100 mol/L × 0.5000 L = 0.0500 mol
Next, we will convert 0.0500 moles of NaCl to grams using its molar mass.
0.0500 mol × 58.5 g/mol = 2.93 g
In order to prepare 500.0 mL of a 0.100 M NaCl solution, 2.93 g of sodium chloride are required (Option b).
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sphingomyelin contains a fatty acid linked by an ________ bond and phosphocholine linked via the c-3 hydroxyl group of sphingosine.
Answers
your welcome
If a sample has a mass of 245.8 grams and takes up 94ml of space, what is the density of the sample?
Answers
To find the density of any sample, you need to know the Mass (grams), and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get a sample's Density.
Density (P)= Mass(m)/Volume(V)
P=m/V
P=245.8grams/94ml
P=2.65grams per ml
Elements of group 4a do not commonly form ions. generally form negative ions. do not combine with other elements. generally form positive ions.
Answers
Final answer:
Elements of Group 4A typically do not form ions readily, but when they do, they generally form positive ions or cations with a +4 charge.
Explanation:
Group 4A elements, also known as the carbon group, typically do not form ions easily. This is because the elements in this group generally have a balance between the energy required to lose or gain electrons, making the formation of ions less favorable. When these elements do form ions, they generally form positive ions or cations. Looking at the periodic table, main-group elements to the left tend to form cations with a positive charge equal to the group number. Conversely, elements to the right, particularly nonmetals, often form anions with a negative charge corresponding to the number of groups they are left of the noble gases. Group 4A elements would thus be expected to form 4+ cations if they were to form ions, which is a high charge and not commonly observed due to the energy involved in removing four electrons.
Write a balanced equation for the complete combustion of glucose (c6h12o6). oxygen gas is the other reactant in this combustion reaction. the products are co2 and h2o. write a balanced skeleton equation for this reaction.
Answers
balanced equation C6H12O6 + 6O2 -----> 6CO2 + 6 H2O
Skeleton equation [tex]C_6H_12O_6 + O_2[/tex] → [tex]CO_2 + H_2O[/tex]
Balanced equation [tex]C_6H_12O_6 + 6O_2[/tex] → [tex]6CO_2 + H_2O[/tex]
What is a balanced chemical equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
Skeleton equation -A skeletal chemical equation is a representation of a chemical reaction using chemical formulae of reactants and products.
Skeleton equation [tex]C_6H_12O_6 + O_2[/tex] → [tex]CO_2 + H_2O[/tex]
Balanced equation-A balanced chemical equation tells you the amounts of reactants and products needed to satisfy the Law of Conservation of Mass.
Balanced equation [tex]C_6H_12O_6 + 6O_2[/tex] → [tex]6CO_2 + H_2O[/tex]
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How many moles of naf must be dissolved in 1.00 liter of a saturated solution of pbf2 at 25°c to reduce the [pb2+] to 1.0 × 10–6 m? the ksp for pbf2 at 25 °c is 4.0 × 10–8?
Answers
[tex] PbF_{2} [/tex] → [tex] Pb^{2+} [/tex] + [tex] 2F^{-} [/tex]
Ksp= [[tex] Pb^{2+} [/tex]] [[tex] F^{-}[/tex]]^2
4.0 ×[tex] 10^{-8} [/tex] = 1×[tex] 10^{-6} [/tex] [[tex] F^{-}[/tex]]^2
∴[[tex] F^{-} [/tex]] = 0.2 mole
Thus, 0.2 mole of NaF must be dissolved in 1l of sat. solution of [tex] PbF_{2} [/tex] to reduce [tex] Pb^{2+} [/tex] to 1 X 10^(-6) M
To reduce the [Pb2+] to 1.0 × 10⁻⁶ M in a 1.00 liter solution of saturated PbF2, 26.45 grams of NaF should be added, as the Ksp for PbF2 is 4.0 × 10⁻⁸ at 25°C.
Explanation:To determine how many moles of NaF must be added to a 1.00 liter solution of saturated PbF2 to reduce the [Pb2+] concentration to 1.0 × 10−6 M, we need to consider the Ksp of PbF2 and the common ion effect. The Ksp expression for PbF2 is Ksp = [Pb2+][F−]2, and the Ksp value given is 4.0 × 10−8 at 25°C. As we add NaF, which is a source of fluoride ions, F−, this will affect the equilibrium according to Le Chatelier's principle.
Since NaF fully dissociates in solution, each mole of NaF will provide one mole of F−. Our target is to maintain the [Pb2+] at 1.0 × 10−6 M while knowing the Ksp. From this, we can derive that:
[F−] = √(Ksp / [Pb2+]) = √(4.0 × 10⁻⁸ / 1.0 × 10⁻⁶ M) = √(4.0 × 10⁻² M) = 6.3 × 10⁻¹ M
Since the concentration of F− should be approximately 0.63 M to maintain the [Pb2+] at the desired level, and we want to achieve this in a 1-liter solution, we need to dissolve 0.63 moles of NaF:
0.63 moles × 41.99 g/mol = 26.45 grams of NaF.
This is the mass of NaF that should be dissolved to achieve the desired [Pb2+] in the solution.
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In a reduction half-reaction, which amount is shown?
A. The number of atoms needed to balance the equation
B. The number of electrons and element gains
C. The number of electrons an element loses
D. The number of electrons needed to balance the equation
Answers
In a reduction half-reaction the number of electrons an element gains are shown.
Explanation:
Reduction reactions are those reactions in which an atom gains electron (s). In a cell a redox reaction is carried out either utilize electricity or produce electricity. Let suppose a general redox reaction shown below,
A⁺ + B → A + B⁺
For above reaction the reduction half-reaction is as follow,
A⁺ + 1 e⁻ → A
(Hence, in this reaction only the number of electrons an element gain are shown)
And the oxidation half reaction is as follow,
B → B⁺ + 1 e⁻
A student conducted an experiment and was interested in the mass of the product of the chemical reaction. some results are shown above. what is the mass of the nacl?
Answers
..............................................................................................................................
The reaction involved in present question is:
NaHCO3(s) + HCl(aq) → NaCl(s) + CO2(g) + H2O(g)
From the above reaction, it can be seen that sodium bicarbonate on reacting with HCl gets converted into NaCl (s), CO2(g) and H2O(g).
CO2(g) and H2O(g) being gas will be lost from evaporating disk and watch glass, therefore there will be lost in mass.
Thus mass let in evaporating disk and watch glass will be only due to NaCl,
= 44.45 - 42.70 = 1.75 g
The correct answer is option B
A 25.0L sample of gas at STP is heated to 55c at 605 torr. What is the new volume?
Answers
First we can find the number of moles of gas for the given volume at STP and then calculate the new volume
Molar volume states that there 1 mol of any gas occupies a volume of 22.4 L at STP.
Therefore if 22.4 L contains - 1 mol of gas
then 25.0 L contains - 25.0 L / 22.4 L/mol = 1.12 mol
when the pressure and temperature conditions are changed the number of moles of gas remains the same
using the ideal gas law equation we can find the volume of the gas
PV = nRT
where P - pressure - 605 torr x 133.3 Pa/torr = 80 647 Pa
V - volume
n - number of moles - 1.12 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature in kelvin - 55°C + 273 = 328 K
substituting these values in the equation
80 647 Pa x V = 1.12 mol x 8.314 Jmol⁻¹K⁻¹ x 328 K
V = 37.9 L
new volume at the given conditions is 37.9 L
Final answer:
To find the new volume of the gas, we can use the combined gas law formula and solve for V2. By plugging in the given values into the formula, we find that the new volume is approximately 27.2 L.
Explanation:
To solve this problem, we can use the combined gas law formula, which relates the initial and final volume, temperature, and pressure of a gas:
V1/T1 = V2/T2
Given that the initial volume (V1) is 25.0 L, the initial temperature (T1) is 0°C, and the final temperature (T2) is 55°C, we can convert the temperatures to Kelvin by adding 273 to each value.
Plugging in the values, we get:
25.0 L / (273 K) = V2 / (273 K + 55°C)
Solving for V2, we find that the new volume is approximately 27.2 L.
What is the number of electrons in an atom of 23v that have an quantum number of 2?
Answers
v has confiduration of 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^3
so it has 3 electrons
The maximum number of electrons in a p sub-level is:
Answers
Answer:
The maximum number of electrons in a p sub-level is 6.
Explanation:
The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed in order according to their energy level. Electrons with less energy will be spinning at level 1.
Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4 and these are called: s, p, d, f. In the sub-level s there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.
In level 1 there is only one sub-level, which will be the s. In level 2 there are 2 sub-levels, the s and the p. At level 3 there are 3 sub-levels s, p and d. And at level 4 there are 4 sub-levels, the s, the p, the d and the f.
So, the maximum number of electrons in a p sub-level is 6.
How many moles of water h2o are present in 75.0 g h2o?
Answers
What is the volume occupied by .355 mole of nitrogen gas at stp?
Answers
P V = n R T
Solving equation for V,
V = n R T / P ------- (1)
Data Given;
Volume to find = V = ?
Standard Pressure = P = 1 atm
Standard Temperature = T = 273 K
Moles Given = n = 0.355 mol
Putting values in eq.1,
V = (0.355 mol × 0.0821 atm.L.mol⁻¹.K⁻¹ × 273 K) ÷ 1 atm
V = 7.95 L
Check all correct statements concerning pentyne.
contains 3 carbons
contains 5 carbons
contains 7 carbons
has only single bonds
has a double bond
has a triple bond
is an alkyne
is an alkene
is an alkane
Which statement is not true of alkenes?
They are unsaturated.
They are reactive.
They have double bonds.
They are more stable than alkanes.
Butene would have 4 carbon atoms and a ______ bond.
Single
Triple
Double
Which type of reaction to alkenes generally undergo?
Substitution
Displacement
Redox
Addition
If the carbon atom of hydrocarbon is bonded to less than 4 other atoms, the hydrocarbon is considered _______.
aromatic
diluted
saturated
unsaturated
Which of the following apply to unsaturated hydrocarbons? Select all that apply.
They do not have isomers.
They are more stable than saturated hydrocarbons.
They will react readily with other elements and compounds.
They have double and triple bonds.
They only have single bonds.
A straight chain hydrocarbon with the formula C5H10:
has a triple C-C bond
has a double C-C bond
is essentially inert
is unstable and extremely reactive
What is the general formula for alkenes?
CnH2n+2
CnH2n
CnH2n+1
CH2n+2
Choose the statements about benzene that are correct.
all benzene hydrocarbons are CnHn+2
All C-C bonds share 2 pairs of electrons.
Three C-C bonds share 2 pairs of electrons.
All of the C-C bonds are actually identical.
The structure of the molecule is closed like a ring structure.
The last one is attached as a pic.
Answers
a) contains 5 carbons
b) has a triple bond
c) is an alkyne
2) Which statement is not true of alkenes?
a) They are more stable than alkanes.
3) Butene would have 4 carbon atoms and a ______ bond.
a) Double Bond
4) Which type of reaction to alkenes generally undergo?
a) Addition Reaction
5) If the carbon atom of hydrocarbon is bonded to less than 4 other atoms, the hydrocarbon is considered _______.
a) Unsaturated
6) Which of the following apply to unsaturated hydrocarbons? Select all that apply.
a) They will react readily with other elements and compounds.
b) They have double and triple bonds.
7) A straight chain hydrocarbon with the formula C5H10:
a) has a double C-C bond
8) What is the general formula for alkenes?
a) CnH2n
9) Choose the statements about benzene that are correct.
a) All of the C-C bonds are actually identical.
b) The structure of the molecule is closed like a ring structure.
Explanation:
1) Pentyne is an unsaturated hydrocarbon with formula [tex]C_5H_8[/tex]. It is an alkyne molecule with single triple bond present in it.
Correct statements are:
Contains 5 carbonsHas a triple bond Is an alkyne2) Alkenes are unsaturated hydrocarbons with double bonds.
They are unsaturated.They are reactive. They have double bonds.3) Butene is an unsaturated hydrocarbon with 4 carbon atoms and double bonds.
4)Alkene undergo addition reaction easily.
5)If the carbon atom of hydrocarbon is bonded to less than 4 other atoms, the hydrocarbon is considered unsaturated.
6)The correct statements are:
They have double and triple bonds. They will react readily with other elements and compounds.7)The general formula of :
Alkane = [tex]C_nH_{2n+2}[/tex]
Alkene = [tex]C_nH_{2n}[/tex]
Alkyne = [tex]C_nH_{2n-2}[/tex]
The [tex]C_5H_{10}[/tex] is an alkene with double C-C bond.
8) The general formula of alkene is given by: [tex]C_nH_{2n}[/tex]
9) Benzene is an aromatic cyclic compound with six membered carbon ring with alternative double bonds. Due to conjugation of double bond all the C-C bonds are identical.
All C-C bonds share 2 pairs of electrons.All of the C-C bonds are actually identical.The structure of the molecule is closed like a ring structure.Calculate the molarity of a kcl solution made by dissolving 21.2 g of kcl in a total volume of 500. ml. calculate the molarity of a kcl solution made by dissolving 21.2 g of kcl in a total volume of 500. ml. 0.142 0.284 7.03 0.569 none of the above
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Gram molecular weight of KCl = 74.55 g
Volume of solution = 500 ml = 0.5 l
∴ Molarity = [tex] \frac{21.2}{74.55 X 0.5}[/tex] = 0.569 M
What hormone promotes active tubular secretion of potassium ions into, along with sodium absorption from, filtrate in the distal convoluted tubule (dct) and collecting ducts?
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How many moles of nitrogen, n, are in 83.0 g of nitrous oxide, n2o?
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find the moles of N2O
moles = mass/molar mass
= 83 g/44g/mol= 1.886 moles
the moles of Nitrogen in N2O is therefore
=1.886 moles x2(since there are two atom of N in N2O) =3.772 moles
There are approximately [tex]3.772[/tex] moles of nitrogen in [tex]83.0 g[/tex] of nitrous oxide [tex](N\(_2\)O)[/tex]
To determine the number of moles of nitrogen in [tex]83.0 g[/tex] of nitrous oxide [tex](N\(_2\)O)[/tex], we need to follow these steps:
1. Calculate the molar mass of [tex]N\(_2\)O[/tex]:
Nitrogen ([tex]N[/tex]) has a molar mass of approximately [tex]14.01 g/mol.[/tex]
Oxygen ([tex]O[/tex]) has a molar mass of approximately [tex]16.00 g/mol.[/tex]
The molar mass of [tex]N\(_2\)O[/tex] is:
[tex]\[\text{Molar mass of N}_2\text{O} = 2 \times 14.01 \, \text{g/mol} + 16.00 \, \text{g/mol} = 28.02 \, \text{g/mol} + 16.00 \, \text{g/mol} = 44.02 \, \text{g/mol}\][/tex]
2. Calculate the number of moles of [tex]N\(_2\)O[/tex] in [tex]83.0 g[/tex]:
[tex]\[\text{Number of moles of N}_2\text{O} = \frac{83.0 \, \text{g}}{44.02 \, \text{g/mol}} = 1.886 \, \text{moles}\][/tex]
3. Determine the number of moles of nitrogen atoms in [tex]N\(_2\)O[/tex]
Each molecule of [tex]N\(_2\)O[/tex] contains [tex]2[/tex] nitrogen atoms. Therefore, the number of moles of nitrogen atoms is twice the number of moles of [tex]N\(_2\)O.[/tex]
[tex]\[\text{Number of moles of nitrogen atoms} = 2 \times 1.886 \, \text{moles} = 3.772 \, \text{moles}\][/tex]
Identify the term being defined. the force that keeps the nucleons bound inside the nucleus of an atom the amount of energy needed to split the nucleus into individual protons and neutrons the difference between the mass of the nucleons and the mass of the atom
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Binding energy; is the amount of energy needed to split the nucleus into individual protons and neutrons. It is the minimum energy required to separate a nucleus into free, unbound nucleons. The energy lost in the process of binding together the nucleons in the nucleus of an atom.
Mass defect is the difference between the mass of a nucleus and the sum of the masses of its component nucleons.
1. Nuclear Force:Nuclear force is also referred to as the strong nuclear force and acts between the protons and neutrons also referred to as nucleons within the nucleus of an atom. The nuclear force is able to counteract the repulsion between the nucleons and hold them together thus giving a nucleus its stability. 2. Binding Energy:Binding energy refers to the amount of energy that would enable to overcome the strong nuclear force that pulls the nucleons in a compact mass. It plays its role in nuclear reactions including fission and fusion.
3. Mass Defect:The mass defect is calculated with the help of the total mass of the individual nucleons. Mass defect is essential in nuclear reactions since it explains reasons such as fission that occurs when a heavy nucleus splits into lighter nuclei as a way of releasing energy.
Why do living things use enzymes instead of heat as a source of activation energy?
Adding heat would not give the reactants enough energy.
Adding heat does not affect how chemical reactions take place.
Adding sufficient heat would harm or kill a living thing.
Adding heat gives reactants the wrong kind of energy.
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Living things use enzymes instead of a heat source because they speed up chemical reactions as well as the metabolism in those living. Adding sufficient heat would harm or kill a living thing, also enzymes are far more efficient. A single enzyme can often carry out thousands of reactions per second. Living organisms use enzymes for activation energy because they speed up chemical reactions.