Answer:
C.) It is the functional group that distinguishes one amino acid from another.
Explanation:
An R group is also known as a random group and is one of the key components of an amino acid. It contributes to their wide variety.
The role of an R group in an amino acid as It is the functional group that distinguishes one amino acid from another. Option C is correct.
What are functional groups?The functional groups are the some groups of chemicals oh hydrogen and notrgen and oxygen or carbon combination like carboxylic acid they are combination of carbon and amines as they are amnio groups etc.
The R attached at the end represents the different functional gropus of amino acids in the chain of hydrocarbon compound or orgamic compounds as they are primay and secondry and tertiary amines.
Therefore, Option C is correct.The role of an R group in an amino acid as It is the functional group that distinguishes one amino acid from another.
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calculate the mass percent of water in CaCrO4.H2O
Answer:
10.35%
Explanation:
Find the molar mass of water, using your periodic table: 18.02 g. Then find the molar mass of the total substance: 174.10 g.
Divide the molar mass of water by the molar mass of the total substance and multiply 100%. Doing this, you get 10.35%.
Question 21 of 25
What is the oxidation state of Cl in HCIO4?
O A. +7
OB. -3
O c. -1
D. +8
Answer:
7
Explanation:
you take 295.5 g of a solid at 30.0 c and let it melt in 425 g of water. the water temperature decreases from 85.1 c to 30.0 c. calculate the heat of fusion of this solid
Answer:
[tex]\Delta _{fus}H=332 \frac{J}{g}[/tex]
Explanation:
Hello!
In this case, since the heat of fusion of a solid substance stands for the energy required to melt it, which is a phase transition from solid to liquid, we can see that the heat lost by water is that gained by the solid, so we can write:
[tex]Q_{solid}=-Q_{w}[/tex]
Thus, by using the water data and its specific heat (4.184), we obtain:
[tex]Q_{solid}=-m_{w}C_{w}(T_f-T_i)\\\\Q_{solid}=-425g*4.184\frac{J}{g\°C}*(30.0-85.1)\°C\\\\ Q_{solid}=97,978.82J=98.0kJ[/tex]
Next, since the heat of fusion of a substance is usually represented in terms of energy per amount of substance, we use the mass of solid to obtain:
[tex]\Delta _{fus}H=\frac{98.0kJ}{295.5g}\\\\ \Delta _{fus}H=0.332\frac{kJ}{g}=332 \frac{J}{g}[/tex]
Best regards!
The heat of fusion of the solid is 0.332 KJ/g or 332 J/g
We'll begin by calculating the heat loss by the water. This can be obtained as follow:
Mass of water (M) = 425 g
Initial temperature of water (T₁) = 85.1 °C
Final temperature (T₂) = 30 °C
Change in temperature (ΔT) = T₂ – T₁ = 30 – 85.1 = –55.1 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Heat loss (Q) =?Q = MCΔT
Q = 425 × 4.184 × –55.1
Q = –97978.82 J
Divide by 1000 to express in KJ
Q = –97978.82 / 1000
Q = –97.98 KJ Finally, we shall determine the heat fusion of the solid.Heat loss by water = –97.98 KJ
Heat gained by the solid (Q) = 97.98 KJ
Mass of solid (m) = 295.5 g
Heat of fusion (Hf) =?Q = m•Hf
97.98 = 295.5 × Hf
Divide both side by 295.5
Hf = 97.98 / 295.5
Hf = 0.332 KJ/g or 332 J/gLearn more: https://brainly.com/question/15563205
Describe the motion of particles in a liquid as it freezes.
Answer:
The particles in a liquid as it freezes slow down.
Explanation:
This is because heat is energy and when there is less heat, there is less energy causing the particles to slow down.
Complete the passage about the properties of ionic compounds.
It is difficult to break the lonic bonds in a compound because of the________
room temperature because they have_________
Answer:
Following are the solution to the given question:
Explanation:
Due to the strong attachment among ions, it's indeed hard to break the covalent compounds in a combination. The ionic compounds, as they have a great melting point, become solid at room temperature, and may we say that the stronger between both the ions, as it is on a high point of fusion, is quite desirable.
if the Chemical Reaction bellow started out with a total mass of 45 grams, what would be the total mass of the products?
2Na + 2H2O ---> 2 NA OH + H2
Answer:
When 45 gram of total mass of reactant react 45 gram of product will also produced
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
In a similar way,
2Na + 2H₂O → 2NaOH + H₂
45 g = 45 g
when 45 gram of total mass of reactant react 45 gram of product will also produced. (2NaOH + H₂ = 45 g)
Methylcycohexane has a cyclic compound of 7 Carbons
True or
False
Answer:
True
Explanation:
Methylcyclohexane has a cyclic compound of 7 carbons false classified as Saturated Hydrocarbon.
A metal ball and beaker of water are at room temperature. The ball is heated and immediately placed in the water. Which statement describes the energy transfers as the ball and the beaker of water approach thermal equilibrium?
A. The energy gained by the water will equal the energy lost by the surroundings.
B. The energy lost by the water and the cube will equal the energy lost by the surroundings.
C. The energy lost by the cube will equal the energy gained by the water and the surroundings.
There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, the correct option is option A.
What is energy transfer in thermodynamics?Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.
Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. The energy gained by the water will equal the energy lost by the surroundings.
Therefore, the correct option is option A.
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The molecules in a solid do not move.
True
False
Answer:
True
Explanation:
Solid molecules don't move.
Molecule of a solid are tightly packed there is no space between them so there is no movement of the molecule.
The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.
true
MCQ
A sample of tungsten occupies a volume of 1.6 cm3. How many atoms of
tungsten in the sample? (For tungsten, density = 19.35 g/cm3)
O 61.92
O 0.337
2.03X10^23
O 1.014X1023
5.07X10^22
O 2.54X10-22
Answer:
1.014×10²³ atoms
Explanation:
Given data:
Volume of tungsten = 1.6 cm³
Density of tungsten = 19.35 g/cm³
Number of atoms of tungsten = ?
Solution:
First of all we will calculate the mass of tungsten.
density = mass/volume
by putting values,
19.35 g/cm³ = mass/1.6 cm³
Mass = 19.35 g/cm³× 1.6 cm³
Mass = 30.96 g
Number of moles of tungsten:
Number of moles = mass/molar mass
Number of moles = 30.96 g/ 183.84 g/mol
Number of moles = 0.1684 mol
1 mole contain 6.022×10²³ atoms.
0.1684 mol × 6.022×10²³ atoms / 1mol
1.014×10²³ atoms
If the positive end of a water molecule were to encounter the surface shown above, what might happen to the surface’s negative charges? Explain your reasoning.
Answer:
The negative charges of the surface will be attracted to the positive ends of the water molecule
Explanation:
A water molecule is a polar molecule. This means that the two ends of a water molecule are oppositely charged with one end being positive and the other end being negative.
When the positive end of a water molecule encounters a surface as shown in the attachment, where positive and negative charges are evenly distributed at rest, with the negative charges free to move, the negative charges will be attracted to the positive end of the water molecule due to the principle of electrostatics which states that unlike charges attract, while like charges repel. This means that negative and positive charges are attracted to each other while positive and positive or negative and negative charges are repelled from each other. Therefore, the water molecule will adhere to the surface because of the attraction between opposite charges.
The unlike charges will attract as expected based on the laws of electrostatics.
According to the laws of electrostatics, like charges repel while unlike charges attract. We are told in the question that water is a polar molecule with a positive and a negative end.
If the positive end of water dipole approaches the negative charges on the surface, the unlike charges will attract as expected based on the laws of electrostatics.
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PLEASE HELP URGENT!!
c) 2Al(s) + 3C12 (g) → 2AICI3
Reactant Side-
Product Side-
Oxidizing Agents
Reducing Agent
Answer:
Reactant Side = Al + Cl₂
Product Side = AlCl₃
Oxidizing Agents = chlorine
Reducing Agent = aluminum
Explanation:
Chemical equation:
2Al + 3Cl₂ → 2AlCl₃
In this chemical equation Al and Cl₂ are reactants while AlCl₃ is product.
2Al° + 3Cl₂° → 2Al⁺³Cl⁻¹₃
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
In given reaction Al is oxidized because oxidation increase from zero to +3. It is thus reducing agent.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
In given reaction chlorine is reduced because its oxidation state is decreased from zero to -1. Chlorine is oxidizing agent.
Oxidizing agents:
Oxidizing agents oxidize the other elements and itself gets reduced.
Reducing agents:
Reducing agents reduced the other element are it self gets oxidized.
The value of ΔH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is __________ kJ.
23 2S (s) + 3O (g) 2SO (g
The enthalpy change accompanying the reaction of 0.95 g of S is -11.85 kJ
Further explanationGiven
ΔH° for the reaction is -790 kJ
Required
The enthalpy change
Solution
Reaction
2S (s) + 3O₂(g) = 2SO₃ (g)
mol of S(MW=32 g/mol) :
[tex]\tt mol=\dfrac{0.95}{32}=0.03[/tex]
For 2 mol S, the entalphy = -790kJ
The enthalpy change for 0.03 mol :
[tex]\tt \dfrac{0.03}{2}\times -790~kJ=-11.85~kJ[/tex]
The enthalpy change accompanying the reaction will be "-11.85 kJ".
Given:
Value of ΔH°,
-790 kJAccording to the question,
→ [tex]2S(s) +3O_2(g) =2SO_3(g)[/tex]
Mol of S will be:
= [tex]\frac{0.95}{32}[/tex]
= [tex]0.03[/tex]
hence,
The enthalpy change for 0.03 mol will be:
= [tex]\frac{0.03}{2}\times -790[/tex]
= [tex]-11.85 \ kJ[/tex]
Thus the answer above is correct.
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Farmers breed cows to produce high amounts of milk. This is an example of...
A. natural selection
B. variation in species
C. selective breeding
D. inbreeding
Which of the following would be most useful in trying to obtain procedural information to replicate an experiment previously published?
Answer:
Peer-reviewed Journal Article
Explanation:
1.Dictionary
2.Encyclopidia
3.Internet Search Engine
4.Peer-reviewed Journal Article
The correct answer as to which would be most useful in trying to obtain procedural information to replicate an experiment previously published would be a peer-reviewed journal article.
A peer-reviewed journal article is a journal article written by an expert or experts on a particular topic and has undergone thorough reviews by experts in the same field and certified to be of good-enough standards to be published.
Such an article would contain all the necessary information relating to the experiment leading to the article. Hence, in order to obtain procedural information to replicate an experiment that has been previously published, a peer-reviewed journal published on the same topic would do be the right place to seek.
a mountain
b trench
c mid ocean range
What is the product in this reaction? What are its properties
Answer:
In a chemical reaction, substances (elements and/or compounds) called reactants are changed into other substances (compounds and/or elements) called products. You can’t change one element into another in a chemical reaction — that happens in nuclear reactions. Instead, you create a new substance with chemical reactions.
In general terms, a chemical reaction follows this format:
Reactants→Products
For example, take a look at the reaction that occurs when you light your natural gas range. Methane (natural gas) reacts with the oxygen in the atmosphere to produce carbon dioxide and water vapor. The chemical equation that represents this reaction is written like this:
Methane and oxygen (oxygen is a diatomic — two-atom — element) are the reactants, while carbon dioxide and water are the products.
Explanation:
In the given incomplete chemical reaction, the product formed are [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex], respectively.
Product is the final result in a chemical reaction where reactants react to produce new substance.
The complete balanced reaction for the given reaction is expressed as:
[tex]\rm CH_4+2O_2\rightarrow CO_2 + 2H_2O[/tex]
In this reaction, methane undergoes combustion reaction in presence of oxygen to produce [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] as the final product.
Properties of the final products are:
[tex]\rm CO_2[/tex] (carbon dioxide) is a colorless, odorless gas that is denser than air. It is non-flammable, non-toxic, and does not support combustion. It is a greenhouse gas, which means that it contributes to global warming and climate change.
Water is a colorless, odorless, and tasteless liquid that is essential for life. It helps in various metabolic process taking place within human body.
Therefore, the complete and balanced equation for provide equation with final product is [tex]\rm CH_4+2O_2\rightarrow CO_2 + 2H_2O[/tex].
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The given question is incomplete. The complete question is:
What is the product in this reaction: [tex]\rm CH_4+2O_2\rightarrow[/tex]? What are its properties?
How many liters of carbon dioxide are formed from the complete decomposition of 50.0 g of iron (III) carbonate at STP?
Answer:
V = 1.57 L
Explanation:
Given data:
Mass of iron(III) carbonate = 50.0 g
Volume of CO₂ formed = ?
Temperature = standard = 273 K
Pressure = standard = 1 atm
Solution:
Chemical equation:
Fe₂(CO₃)₃ → Fe₂O₃ + 3CO₂
Number of moles of Fe₂(CO₃)₃ :
Number of moles = mass/molar mass
Number of moles = 50.0 g /235.8 g/mol
Number of moles = 0.21 mol
Now we will compare the moles of Fe₂(CO₃)₃ and CO₂.
Fe₂(CO₃)₃ : CO₂
1 : 3
0.21 : 1/3×0.21 = 0.07 mol
Volume of CO₂:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
By putting values,
1 atm × V =0.07 mol × 0.0821 atm.L/mol.K × 273 K
V = 1.57 atm.L / 1 atm
V = 1.57 L
A chemist measures the amount of oxygen gas produced during an experiment. She finds that of oxygen gas is produced. Calculate the number of moles of oxygen gas produced. Be sure your answer has the correct number of significant digits.
Answer:
This question is incomplete. A fragment of the question is missing. The fragment is:
She finds that 4.87 g of oxygen gas is produced
0.152 moles
Explanation:
Using the formula: mole = mass / molar mass
According to the question, a chemist measures the amount of oxygen gas produced during an experiment. Oxygen gas has the chemical formula: O2. Hence, the molar mass will be:
O2 = 16(2) = 32g/mol
If the mass of the oxygen gas to be 4.87 g of oxygen gas.
Therefore,
moles = 4.87/32
moles = 0.152mol
How many moles of Ca atoms are in 1 mol of CaSO4?
Answer:
6.02 x 10²³ atoms
Explanation:
Given parameters:
Number of moles CaSO₄ = 1 mole
Unknown:
Number of Ca atoms in the given compound = ?
Solution:
The given compound is:
CaSO₄
1 mole of CaSO₄ is made up of 1 mole of Ca atoms
Now;
1 mole of any substance contains 6.02 x 10²³ atoms
1 mole of Ca atoms will also contain 6.02 x 10²³ atoms
Between these three liquids, which one would burn through this website's new "interactive" advertising system the fastest? (asking for a friend)
A. Molten lava
B. Hydrochloric acid
C. Nitric acid
for reference assume the "interactive" advertisements are made of the materials in a standard monitor, a visual display, circuitry, casing, and power supply
Answer:
Most likely A. Molten lava, since it straight up melts the equipment which is much faster than chemicals dissolving the equipment like hydrochloric acid and nitric acid.
Explanation:
Hope this helped!
P.S. Sure, why not?
Find the mass of an object with a density of 2.01g/mL and a volume of 3.77mL
Answer:
7.58 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 2.01 × 3.77 = 7.5777
We have the final answer as
7.58 gHope this helps you
Carbonic acid (H2CO3) forms when carbon dioxide (CO2) dissolves in water
according to this equation:
CO2 + H2O
H2CO3
How many moles of CO2 must dissolve in excess water to produce 12 moles of
H2CO3?
Enter your answer as a number only; no units.
Answer:
12 molcules
Explanation:
distruibtive property.
Where are all metalloid found in this periodic table?
Answer:
Explanation:
THe GrEen OnEs
Answer:
They are in the green "staircase"
Explanation:
these elements are the dividers between metals (on the left of them) and non metals (on the right of them), they have some of the properties of both groups
Which of the following is NOT true about comparisons between analog and digital signals?
Question 3 options:
Digital signals are pulses of voltage that switch currents on an off in devices like computers.
Analog signals are used to convert sound waves into electronic signals.
Digital signals are more prone to distortion.
Analog signals are more prone to distortion.
Answer:
Analog signals are used to convert sound waves into electronic signals.
Explanation:
i think i hope i helped :))
how is your day going?
Answer
B
Explanation:
I did this quiz and i think i got it right Good luck!
Hydrogen bonds are formed between molecules when hydrogen is covalently bonded to an element that has a
1
small atomic radius and low electronegativity
2
large atomic radius and low electronegativity
3
small atomic radius and high electronegativity
4
large atomic radius and high electronegativity
Submit Answer
Answer:
choice 3
Explanation:
Hydrogen bonding occurs when a H is bonded to a highly electronegative atom like F. Towards the upper right corner, most atoms have high electronegativity and small atomic radii, according to periodic trends.
Please give thanks :)
Hydrogen is covalently bonded to an element that has a small atomic radius and high electronegativity.
• An intermolecular attractive force in which an atom of hydrogen, which is bonded covalently to a small, highly electronegative atom is known as a hydrogen bond.
• Hydrogen bonds are very strong in comparison to other dipole interactions.
• A typical hydrogen bond exhibits a strength of about 5 percent of that of a covalent bond.
• Hydrogen bonding takes place only in molecules where hydrogen bonding is bonded covalently to one of the three elements, that is, oxygen, fluorine, or nitrogen.
Thus, correct answer is option 3.
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How many moles of N2O5 are needed
to produce 7.90 g of NO2?
Answer:
0.085 moles of N₂O₅ are needed
Explanation:
Given data:
Mass of NO₂ produces = 7.90 g
Moles of N₂O₅ needed = ?
Solution:
2N₂O₅ → 4NO₂ + O₂
Number of moles of NO₂ produced :
Number of moles = mass/ molar mass
Number of moles = 7.90 g/ 46 g/mol
Number of moles = 0.17 mol
now we will compare the moles of NO₂ with N₂O₅.
NO₂ : N₂O₅
4 : 2
0.17 : 2/4×0.17 = 0.085 mol
Thus, 0.085 moles of N₂O₅ are needed.
What are two dangers associated with
nuclear fission?
Answer:
Nuclear energy produces radioactive waste
A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years
Explanation:
In the elimination reaction of 1-bromo-2-ethylcyclohexane in sodium hydroxide in ethanol solution A) is faster for the trans isomer since the bromine and ethyl group are of different sides of the ring. B) is faster for the trans isomer since the bromine and the ethyl groups are both axial. C) is faster for the trans isomer since the bromine and the ethyl groups are both equitorial. D) is faster for the trans isomer since there is a hydrogen anti-periplanar to the bromine in the preferred chair conformer of the compound. E) None of the above provides a correct response.
Answer:
D
Explanation:
Option D is correct
Cycloalkanes(1-bromo 2-ehtyl cyclohexane is this case) mainly preferred chair conformers while undergoing elimination reaction and further products are not those that predicted by zaitsev's rule.
Hence, the correct answer is faster for the trans isomer since there is a hydrogen anti-periplanar to the bromine in the preferred chair conformer of the compound.
Does deforestation cause the amount of carbon dioxide in the air to increase or decrease?
Answer:
Explanation:
Deforestation has an adverse affect on air by reducing the amount of oxygen and increasing the amount of carbon dioxide as well as contributing to global warming.