Answer:
The breaking of the hydrogen bonds due to the force relieves the torsional stress stored in a double helix. As a result, the nucleotide strands rotate more freely about the axis of a helix and start unwinding. ... The DNA unzipping and the DNA unwinding result in a structural transformation from dsDNA to ssDNA.
1. In regards to curly hair, which of the following statements
are TRUE? (select 2 answer choices).
A. Curly hair develops over time. It is not acquired at birth.
B. Curly hair can lead to harmful mutations in the body.
C. Curly hair results from a change in the gene that
codes for hair structure.
D. People with curly hair have different hair protein structures than people with
straight hair.
Answer here:
Answer:
A and D are the answers
Explanation:
the other two don't make sense
The statements C and D are correct, i.e., curly hair have different protein structure from straight hair and curly hair results from a change in the gene.
What is protein?Proteins are biomolecules made of amino acids. Proteins are very essential to all living things and contributes the body structure. Proteins are mainly up taken through diet and they are the main source of energy.
Hair is made of keratin protein. Keratin makes up our skin and nails too.Curly hair is originating by birth not developing over time. Curly hair is more likely to be occurring through inheritance.
The protein structure the hair follicle is some more bend for curly hair. Curly hair and straight hair originates from different gene traits. The gene type is inherited from the parents.
Hence, for people with curly hair have different protein structure and it result from a change in gene that code for hair structure. Thus options C and D are correct.
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Name the property of salt investigated in the above experiment
which experiment please involve a clip
list three factors that affect the rate of a chemical reaction
Answer: 1) temperature, 2) add a catalyst, and 3) concentrations
Explanation: A rise in temperature adds kinetic energy to the reactants, leading to more frequent, and energetic collisions, which will often accelerate the reaqction. A catalyst is an agent that helps the reaction move forward more quickly by offering a substrate that aids in orienting the reactants for more efficient reaction. A higher concentration increases the chances of collisons that result in products.
WM "Please write the molecular formula for the following by criss cross method. 1. Calcium nitrate 2. Sodium bicarbonate 3. Magnesium nitrite 4. Sodium chloride 5. Hydrogen sulphate 6. Hydrogen chloride T-Aluminium bisulphate 8 Aluminium chloride 9. Aluminium sulphate 10. Hydrogen Nitrate
Answer:
1 Ca(NO3)2
Calcium- Ca, Valency 2
Nitrate- NO3, Valency 1
AFTER CRISS CROSS:
Ca1(NO3)2
Ca(NO3)2
2 sodium bicarbonate = NaHCO3
Na = Sodium = (Na)+
HCO3 = bicarbonate = (HCO3) -
Na HCO3
3 magnesium nitrite
+2 _ 1
Mg2(NO3)2
4 Na Cl
+1 _1
formula NaCl
5 hydrogen sulphide
H SO4
+1 _2
formula H2SO4
6 H Cl
+1 _1
HCl
7 AL2 HSO4
+2 -2
AL2(HSO4)3
8 NH4 Cl
+1 _1
NH4Cl
9 NH4 SO4
+1 _2
(NH3)2SO4
10 H NO3
+1 _1
HNO3
distinguish between sugar and non-sugar with examples.
Answer:
Reducing sugars are sugars where the anomeric carbon has an OH group attached that can reduce other compounds. Non-reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds. ... Maltose and lactose are reducing sugars, while sucrose is a non-reducing sugar
which of the following represents a beta particle?
Answer:
[tex]{ \sf{A. \: \: { _{ - 1}{}^{0} e }}}[/tex]
A beta particle is an electron.
Explanation:
[tex]{ \tt{ {}^{4}_{2}He \: \: is \: an \: alpha \: particle.}} \\ { \tt{ \gamma \: \: is \: gamma \: rays}} \\ { \tt{ \alpha \: is \: same \: as \: alpha \: particle}}[/tex]
The beta particles are the high energy electron radiations, with the representation as as [tex]\rm ^0_{-1}e[/tex].
What are nuclear reaction radiations?The nuclear radiations result in the release of the mass in the form of varying types of particles. The particles ejected in nuclear reaction are alpha, beta, or gamma particles.
Beta particles are high energy particles with the presence of negative charge with the loss of electron.
The beta particle can be represented as [tex]\rm ^0_{-1}e[/tex]. Thus, option A is correct.
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Xà phòng hoá hoàn toàn 22,2g hỗn hợp gồm 2 este HCOOC2h5 và ch3cooch3 bằng dung dịch naoh 1m ( đun nóng) thể tích dung dịch naoh tối thiểu cần dùng là
Answer:
I can't understand your language? can you write in English
I'm sorry
what is the gram formula of na2co3
Answer:
106 gfm
Explanation:
element. number masses
Na. 2 23×2
C. 1. 12
O. 3. 16×3
then add
106 gfm
Two unknown white, lustrous minerals were tested for hardness and streak. Both had a hardness of 4, and had a white streak. What can you conclude from these tests?
Answer: Fluorite
Explanation: Minerals are naturally occurring inorganic materials with definite chemical compositions and definite physical properties. Hardness and Streak are both physical characteristics used in identifying minerals. The colour of a mineral’s powder defines its streak (it does not change from mineral to mineral) and a streak of white shows that such mineral has a calcium fluoride making it a fluorite. To check streak, one simply scrapes the mineral across an unglazed porcelain plate.
Hardness on the one hand, is the resistance to cutting, scratching, abrasion or indentation of minerals. Mineral hardness is specified by the Mohs hardness scale when working with hand samples, and the scale ranges from 1 (very soft like talc) to 10 (as hard as diamond). A hardness of 4 also put such mineral into the fluorite range indicating that it is harder than calcite, but softer than feldspar.
In conclusion, the tests show that the mineral in question is a fluorite.
What produces the large amount of energy released by a nuclear reaction?
A. the "disappearance" of a small number of electrons.
B. the "creation" of a small amount of mass.
c. the "disappearance" of a small amount of mass.
D. the "creation" of a small number of electrons.
Answer: C the “disappearance” of a small amount of mass.
Explanation:
Wich one is it - this is biochemistry
Answer:
O=O is not a compound; it's a molecule.
Answer:
it is O double bond
Explanation:
because it is not attached with another different molecule like Hydrogen Carbon Sulfur etc. H2O or CO2(these are compounds)
57:17
A ball that has a mechanical energy of 65 J has 12 J of kinetic energy. The ball has blank
energy.
J of potential energy
Answer:
53 Joules
Explanation:
Applying the law of conservation of mechanical energy.
Law of conservation of mechanical energy: States that energy although, energy can not be transformed from one form to another, the total energy of the system remain the same.
I.e,
Mechanical Energy = E.K+P.E..................... Equation 1
Where E.K = Kinetic energy, P.E = Potential energy.
From the question,
Given: Mechanical energy = 65 Joules, K.E = 12 J
Substitute these values into equation 1 and solve for P.E
65 = 12+P.E
P.E = 65-12
P.E = 53 Joules
Consider two gases, A and B, which are in a container at room temperature. What effect will the following changes have on the rate of the reaction between these gases?
The temperature is decreased at a constant volume.
A. Increase
B. Decrease
Answer:
A. The rate of reaction will increase or go up
B. The rate of reaction will decrase or go down.
Explanation:
Increasing the temperature will make the gas particles move faster. Faster movement will increase rate of collision between particles to cause a reaction. Decreasing the temperature will cause the opposite to happen.
Fe + HNO₃ -> Fe(NO₃)2 + H₂
What is the purpose of a catalyst in the production of hydrogen?
Select the correct answer.
- to increase the rate at which water molecules decompose
- to decrease the amount of oxygen produced
- to decrease the temperature of the reaction
- to increase the activation energy of the reaction
The purpose of a catalyst in the production of hydrogen is to increase the rate at which water molecules decompose.
What is a catalyst-A catalyst is a substance that increases the rate of a chemical reaction without itself being consumed or produced during the reaction. As a result, catalysts assist in speeding up chemical reactions while also decreasing the amount of energy needed for the reaction to occur. In hydrogen production, catalysts are used to speed up the decomposition of water into hydrogen and oxygen. The use of catalysts lowers the activation energy required for the reaction to occur, resulting in a faster reaction rate and lower operating temperatures.What is the process of hydrogen production?Hydrogen production has various methods, and one of the most commonly used methods is water electrolysis. In this method, water molecules are split into hydrogen and oxygen using an electric current passed through an electrode. Water is broken down into hydrogen and oxygen during the process, with the assistance of a catalyst. During this process, a catalyst like platinum or nickel is employed to speed up the chemical reaction of water decomposition.
When an electric current is applied to the catalyst, water molecules are broken apart, releasing hydrogen and oxygen atoms.Catalysts lower the activation energy of the reaction, allowing it to occur faster than it would otherwise. In hydrogen production, catalysts are crucial since they enable the reaction to occur at a lower temperature, reducing energy consumption and minimizing operating costs. As a result, the use of catalysts is essential to the production of hydrogen.
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Which is an example of using a physical model to represent an earthquake?
O A. Using a computer to measure what happens during an earthquake
O B. Thinking of an earthquake as someone jumping on the bed next to YOU
C. Calculating the movement of the ground during an earthquake
O D. Shaking a cake that has models of buildings on it SUBMIT
Answer:
D. Shaking a cake [...]
Explanation:
None of the rest are actual physical models representing earthquakes.
Hope that's right! :D
At 35.0°C and 3.00 atm pressure, a gas has a volume of 1.40 L. What pressure does the gas have at 0.00°C and a volume of 0.950 L?
Answer:
im just a child
Explanation:
Can someone do these? Brainliest included
Answer:
Explanation:
6. p⁺ e⁻
Ca²⁺ 20 18
F⁻ 9 10
O²⁻ 8 10
Na⁺ 11 10
7. Physical properties of matter are properties that can be measured or observed without matter changing to an entirely different substance. These include odor, boiling point, melting point, density, electrical conductivity and heat conductivity.
Separation of mixture:
Chromatography involves solvent separation on a solid medium.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
Filtration separates solids of different sizes.
Funnel partitioning with solvents. Solvent dissolves one component but not the other.
8.Bulk Elements => Carbon, Hydrogen, Oxygen, Nitrogen, Sulfur & Phosphouous
Microminerals are those minerals needed in less than 100 mg quantities. Trace minerals or trace elements are usually needed in microgram quantities. Microminerals include iron, zinc, copper, iodine, fluoride, chromium, cobalt, selenium, manganese, and molybdenum.
Diatomic Molecules => H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂
9. Electron Configurations
Na: 1s²2s²2p⁶3s¹ => valence = 3s¹
N: 1s²2s²2p³ => valence = 2s²2p³
Al: 1s²2s²2p⁶3s²3p¹ => valence = 3s²3p¹
Valence is the highest principle quantum number (or, principle energy level ~ ring) in the electron configurations.
10.moles of glucose = 450g/180.16 g/mol =2.50 moles
C₂H₆O₂ = 2(12) + 6(1) + 2(16) = 24 + 6 + 32 = 62 g/mole
Select the correct answer.
AB and BC form a right angle at point B. If A = (-3, -1) and B = (4, 4), what is the equation of BC?
A. x + 3y = 16
B. 2x + y = 12
C. -7x − 5y = -48
D. 7x − 5y = 48
The answer to your question the equation of the line BC is C [tex]-7x - 5y = -48[/tex]
Since AB and BC form a right angle at point B, it means that AB is perpendicular to BC.
To find the equation of BC, we first need to find the gradient of BC.
Let m be the gradient of AB and m' be the gradient of BC, since AB is perpendicular to BC, mm' = -1. Thus m' = -1/m
So, we need to find the gradient of AB and thus find the gradient of BC.
To find the gradient of AB, we use the equation for the gradient of a line in slope-point form. Having point A = (x₁, y₁) = (-3, -1) and point B = (x₂, y₂) = (4, 4).
[tex]m = \frac{y_{2} - y_{1} }{x_{2} - x_{1}}[/tex]
Substituting the values of the variables into the equation, we have
[tex]m = \frac{4 - (-1) }{4 - (-3)}[/tex]
[tex]m = \frac{4 + 1 }{4 + 3}[/tex]
[tex]m = \frac{5}{7}[/tex]
Since m' = -1/m
m' = -1 ÷ 5/7
m' = -7/5
Since we know the gradient of the line BC and the line BC passes through the point B = (4, 4) = (x₂, y₂) we find the equation of the line BC using the equation of a line in slope-point form.
[tex]m' = \frac{y - y_{2} }{x - x_{2}}[/tex]
[tex]-\frac{7}{5} = \frac{y - 4 }{x - 4}[/tex]
cross-multiplying, we have
[tex]-7(x - 4) = 5(y - 4)[/tex]
Expanding the brackets, we have
[tex]-7x + 28 = 5y - 20[/tex]
Subtracting 28 from both sides, we have
[tex]-7x = 5y - 48[/tex]
Subtracting 5y from both sides, we have
[tex]-7x - 5y = -48[/tex]
So, the equation of the line BC is [tex]-7x - 5y = -48[/tex]
The answer to your question the equation of the line BC is C [tex]-7x - 5y = -48[/tex]
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Answer:
its C
Explanation:
ASAP
The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would explain a lower rate after another 3 seconds?
A - The concentration of reactants increased while the concentration of product decreased.
B - The concentration of reactants decreased while the concentration of product increased.
C - All concentrations of reactants and products decreased.
D - All concentrations of reactants and products increased.
Answer:
B
Explanation:
During the first half of the reaction there was an increase in the rate of reaction due to the high concentration of the reactants. But as the reaction continues we witness a decrease in the amount of reactants which lowers the rate.
Answer:
B. The concentration of reactants decreased while the concentration of product increased.
Explanation:
took the test :)
What is reduced in the reaction below?
2H2 + 02 → 2H20
A. H20
B. 02
C. Reduction does not occur.
D. H2
SUBMIT
Answer:
[tex]{ \underline{ \sf{O _{2} \: is \: reduced}}}[/tex]
Explanation:
Reduction means when a reactant loses oxygen or gains hydrogen.
In the equation:
Hydrogen molecule, it neither gains nor loses hydrogen, but it gains oxygen. so :
[tex]{ \sf{H _{2} \: is \: excluded}}[/tex]
Oxygen molecule loses one oxygen atom, and gains four hydrogen atoms, hence it is reduced.
: Axit sunfurơ (H2SO3) là axit yếu, ngay trong dung dịch H2SO3 cũng bị phân hủy thành chất X và H2O. X là:
A. H2S B. SO2 C. H2SO4 D. SO3
Answer:
DD
Explanation:
Please tell me the answer of what is unit?
Answer:
a quantity chosen as a standard in terms of which other quantities may be expressed.
Explanation:
Explanation:
Unit is a standard physical quantity defined and adopted by convention,with other quantity of same kind.
Sodium is dissolved under kerosene oil or paroffin to protect it from the air. 3) State. Huckle's rule for aromaticity with example. How does benzene react with Chlorine in presense of Sun light
Answer:
His rule states that if a cyclic, planar molecule has 4n+2 π electrons
"Every action force creates a reaction force that is equal in strength and opposite in direction." This statement summarizes Newton's
Answer: Newton's Third Law of Motion.
Explanation:
Newton's Third Law of Motion simply states that every action force creates a reaction force and then, this reaction force will be equal in strength and opposite in direction.
The statement simply implies that in every interaction, there will be a pair of forces that is acting on the two interacting objects. An example of Newton's third law of motion can be seen when a person jumps, thenlegs of the person will apply a force to the ground which will then propel the person into the air.
Define symbol and compound with an exomple.
the element of group 1 hour reactive but those of group 18 are inert, why?
Answer:
The noble gases (Group 18) are located in the far right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence shells (octets) make them extremely nonreactive.
How many chlorine (CI) atoms are in Methylene?
Answer:
None
Explanation:
Methylene is an organic compound and organic compounds consist of hydrogen atoms and Carbon atoms in n this case Methylene(CH2) has one carbon and two hydrogens .
Answer: methylene doesn't contain CL(chlorine) atoms
Explanation: the chemical formulae for Methylene is CH2
which means it contains only carbon and hydrogen atoms which is 1(one) carbon 2(two)hydrogen atoms
HOPE THIS HELPS!!
PLEASE URGENT HELP!! 30 POINTS!!!!!!
Answer:
CH³–C=CH——CH³–CH=CH²
Explanation:
THIS IS PROPYNE TO PROPENE
describe two ways in which gases are similar to liquids in properties
Answer:
they have weak intermolecular forces
