Answer:
Error or mistakes during DNA replication is accountable for two-thirds or 66% of the cancer cases. These random and unpredictable errors called mutations that occur during the division of a cell as an error in copying of DNA.
DNA replication has three main steps:
Opening and separation of DNA strands of a helix - carried by an enzyme known as helicase that breaks the hydrogen bonds between nitrogenous bases of the helix of DNA.
The priming of the template strand - DNA primase helps RNA primers to bind to both strands at 3' end as soon as it separated
strat assembling the segments of new DNA on strands called elongation of the strands with help DNA polymerase I and after forming new strands the termination of the replication.
Errors or mistakes can occasionally take place if DNA polymerase inserts a wrong base during elongation of the strands.
What element does beryllium resemble (in terms of electrons) when it loses 2 electrons?
Answer: Helium
Explanation: Beryllium (Be) has an electron configuration of 2-2. Losing two electrons will leave it with two electrons in the first shell, resembling Helium.
What is the base name for the following compound?
C-C-C=0
when dilute HCL is added to zinc pieces taken in a test tube
Answer:
zince chloride will be formed and hydrogen gas will be librated.
Explanation:
When dilute HCl is added to zinc pieces, a rection will takes place as follows :
[tex]Zn+HCl\rightarrow ZnCl_2+H_2[/tex]
It means that zinc chloride will form when zinc reacts with dilute HCL. Also hydrogen gas will produced.
As zinc is more reactive than hydrogen, it displaces hydrogen from its solution and forms zinc chloride. The form product is white in color and H₂ is an odorless gas.
Hence, zince chloride will be formed and hydrogen gas will be librated.
What is the percent composition by mass for hydrogen in water (H2O)?
% H =(_____/_____)x100%=______ % H
Explanation:
Percentage composition = 2/18 = 11.11%.
Almost all of Earth's atmosphere is created through the process of photosynthesis.
True
False
Answer:
ture
Explanation:
trees, plants is what keeps us alive
How many ants would 6 giant anteaters need to eat in one year to get the matter and energy they need? Write a simple formula to help you solve the problem. Then find the answer.
Answer:
180,000 ants
Explanation:
For this problem we can create the following simple formula to solve this problem...
f(x) = 6x
where the variable x represents the number of ants that a single Anteater needs to eat per day. After a quick online search we can see that a single Anteater eats roughly 30,000 ants per day. If we use this value and plug it into the simple formula we can get the total number of ants 6 anteaters need to eat to survive.
f(x) = 6 * 30,000
f(x) = 180,000
The specific heat of aluminum is 0.88 J/g°C. How many joules will it take to make the temperature of a 50. g nugget go up from 20.°C to 70.°C?
Answer:
2200J
Explanation:
Given parameters:
Specific heat of aluminum = 0.88J/g°C
Mass of nugget = 50g
Initial temperature = 20°C
Final temperature = 70°C
Unknown:
Quantity of heat required for the heating = ?
Solution:
To solve this problem, we use the expression below;
H = m c Δt
H is the quantity of heat
m is the mass
c is the specific heat capacity
Δt is the change in temperature
H = 50 x 0.88 x (70 - 20) = 2200J
Write an expression for standard enthalpy of formation using suitable chemical reaction
What are some ways to reduce friction? List at least 3 .
Answer:
Ways to reduce friction are by using oil, rollers from roller blades or other stuff that has a roller in or on it, wax, and grease.
Explanation:
Oil can reduce friction because it is used as a lubricant to reduce friction so moving surfaces slide smoothly over one another the same thing with wax and grease. The rollers are because they reduce friction by reducing contact between moving surfaces.
limitation of hydrogen displacement method
Answer:
Limitation of hydrogen displacement method is described below in detailed explanation.
Explanation:
This approach is beneficial for elements that can displace hydrogen from psychedelics or can consolidate with hydrogen. A single replacement effect, sometimes described as a single displacement reaction, is a reflection in which one component is replaced for a different component in a compound. The origin elements are forever pure elements, such as a clear zinc metal or hydrogen propellant, plus an aqueous compound.
Two balls of equal size are dropped from the same height from the roof of a building. One ball has twice the mass of the other. When the balls reach the ground, how do the kinetic energies of the two balls compare?
A. The lighter ball has more kinetic energy than the heavier ball because it had mass.
B. The heavier ball has more kinetic energy than the lighter ball because it has more mass
C. Both balls have the same kinetic energy because they were dropped from the same height.
Answer:
b the heavier ball has more kinetic energy than the lighter ball because it has more mass
Aluminum has the electronic configuration 2,8,3. How many valence
electrons are in the aluminum atom?
Answer:
3 valence electrons
Explanation:
Because aluminum has three, that means three fluorines can bond. The make the formula AlF3, also known as aluminum trifluoride. Each of the fluorine atoms gets an electron to fill their shell, and the aluminum loses three, giving it a filled shell too (remember, aluminum has three extra electrons).
30 points please help!!!!!!!!
pH 3 = 10 times of pH 4 in terms of H⁺ concentration
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ion. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
So pH 3 and pH 4 have a difference in the concentration of H⁺ ion of 10¹ = 10
pH 3 = -log[10⁻³]
pH 4 = - log[10⁻⁴]
pH 3 = 10 times of pH 4 in terms of H⁺ concentration
And pH 3 is stronger in acid than pH 4
Write three points that how chemical fertilizer impact the environment
Answer:
Chemical fertilizer impact the environment by the following ways:
Their overuse hardened the soilIt causes soil pollution.It decreases fertility of the soil and strengthen pesticides.Which substance below has the greatest intermolecular forces?
O oxygen with a boiling point of -183°C
O water with a boiling point of 100°C
O gold with a boiling point of 2,970°C
O mercury with a boiling point of 357°C
Answer:
Oxygen with a boiling point of -183°C.
Explanation:
Higher the intermolecular forces between the liquid particles, more durable it's for it to flee into the vapor part,you would like a lot of energy to convert it from liquid to the vapor part, in different words, higher its boiling point.
Hope it helps!<3
Plants appear green because the chlorophyll reflects green light from the sun.
True
False
Answer: that should be true if not look it up :)
Explanation:
How many molecules are in 33.6 liters of neon (Ne) gas at STP?
Answer:
moles or atoms?
Explanation:
you can't have a molecule of any so there's two different answers that I can give you:
how many moles? 1.5
how many atoms? 9.03x10^23 atoms
At STP 1 mole of an ideal gas occupies 22.4L.
33.6 L x 1 mol/22.4 L = 1.5 moles of Neon
1.5 moles Ne x 6.02x1023 atoms/mole = 9.03x1023 atoms
9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP. At STP 1 mole of an ideal gas occupies 22.4L.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.
Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.
At STP 1 mole of an ideal gas occupies 22.4L.
33.6 L x 1 mol/22.4 L = 1.5 moles of Neon
1.5 moles Ne x 6.02x10²³ atoms/mole = 9.03x10²³ atoms
Therefore, 9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP.
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Why is the organization of the periodic table by physical properties not very useful?
Answer:
It shows no regular pattern
Explanation:
Physical properties of an element are those we can observe and feel with our senses. Also, the use special equipment can enhance our perception of these properties.
The same physical property can be shared different number elements. On the periodic table, all the elements in group 1 and 2 are metals. This is not very useful for scientists whose emphasis is to distinguish one atom from the other. Therefore, physical properties are highly limited in the organization of the periodic table.A. 6750 J
B. 387 J
C. 1935 J
D. 3.50 J
Answer:
It was answer
A)1935J
Explanation:
_____ unit is the most widely used system of units in both science and business
Explanation:
I think the answer is metric system of units
because it is the most widely used system of units and its use in both science and business.
what is a normal phase of carbon?
the normal phase of carbon is solid
Gas stoichiometry a sample of methane gas having a volume of 2.80 L at 25c and 1.65 atm was mixed with a sample oxygen gas having a volume 35.0L at 31c and 1.25 atm . The mixture was then ignited to form carbon dioxide and water . Calculate the volume of co2 formed at a pressure of 2.50 atm and a temperature of 125 c
Answer:
2.47 L. CO2
Explanation:
First, let's establish what we need to find. The volume of CO2 formed at a pressure of 2.50 atm and a temperature of 125 C. Now, don't let this overwhelm you. To find the volume of CO2 formed, we must first find the amount of CO2 formed.
But to find the amount of CO2 formed, we have to write out the equation for this reaction. The type of reaction depicted here is combustion, where oxygen gas reacts with a substance to form carbon dioxide and water. And we also know that this equation must be balanced, according to the Law of Conservation of Matter. It is as follows:
CH4 + 2 O2 => CO2 + 2 H2O.
Now that we have the equation of the reaction, we can now find which of the two reactants is the limiting reactant. To do this, we need to convert the volumes of methane and oxygen gas to moles. Simply use the Ideal Gas Law to do this, and you get:
Methane Gas: .189 mol | Oxygen Gas: 1.75 mol
Using the equation, we can then see that methane gas is the limiting reactant.
We know, also due to the equation that 1 mol of CO2 is produced for every mol of methane gas. This gives us the answer of .189 mol of CO2 produced. But remember, the question asks us for the volume of CO2 produced, so we must apply the Ideal Gas Law once again, getting the answer of 2.47 L. CO2.
Note: Please remember to use significant figures during your calculations, and if you have any questions, feel free to post them down below.
A. 207 kJ
B. 4730 kJ
C. 9460 kJ
D. 414 kJ
Answer:
C = 9460 Kj
Explanation:
Given data:
Mass of copper = 2kg
Latent heat of vaporization = 4730 Kj/Kg
Energy required to vaporize 2kg copper = ?
Solution:
Equation
Q= mLvap
by putting values,
Q= 2kg × 4730 Kj/Kg
Q = 9460 Kj
A system does 125 J of work and cools down by releasing 438 J of heat. The change in internal energy is ____________ J.
Given that,
Work done by the system = 125 J
Energy released when it cools down = 438 J
To find,
The change in internal energy.
Solution,
As heat is released by the system, Q = -438 J
Work done by the system, W = -125 J
Using the first law of thermodynamics. The change in internal energy is given by :
[tex]\Delta U=Q-W\\\\=-438-125\\\\=-563\ J[/tex]
So, the change in internal energy is 563 J.
Kelle & Jenn are at a pool. Kelle is standing on the high diving board while Jenn is standing on the low diving board. Assuming the difference in weight/mass is negligible, which of the following statements accurately describes this relationship?
A. Kelle has a greater potential energy than Jenn.
B. Jenn & Kelle have equal potential energies.
C. Jenn has a greater potential energy than Kelle.
D. Kelle has a greater kinetic energy than Jenn.
Answer:
A. Kelle has a greater potential energy than Jenn.
Explanation:
We need to apply the kinetic energy equation here to solve this problem: P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
The problem tells us, however, that mass/weight is negligible; therefore, the only thing that really matters here is the height. Kelle is higher up, so she would have a greater potential energy than Jenn, who is lower.
Hello there please help this is for science and if you answer thanks for the help you earned yourself a 5 star.
Answer:
Ice cubes, glass of tea, and butter
Explanation:
Like it said in the hint, the molecules will only speed up if they gain heat. This means in order for the object to heat up it will have to have a temperature that is less than the temperature in the room. Ice cubes, glass of tea, and butter are the three objects that have a temperature less than 72 degrees so when they are placed in the 72 degrees room they will heat gain heat (therefore making the molecules move faster)
Explain why PCI5 can be formed whereas
PI5 cannot be formed.
Answer:
highly unstable
Explanation:
also, due to repulsion of lone pairs and instability it breaks and can't form PI5
hope that helps....
What type of change occurs as salt dissolves in water?
a)phase change
b)element change
c)physical change
d)chemical change
Answer :-
C) Physical change
Describe the chemical reaction based on the
chemical equation below.Also, explain whether
the equation is balanced.
NH2(g) O2(g) pt NO(g)+H2O(I)
Answer:
Ammonia gas reacts with oxygen gas.
Nitric oxide gas and liquid water are produced.
Platinum is used as a catalyst.
The equation is unbalanced because the number of hydrogen atoms is not the same on both sides of the equation.
Explanation:
How much mass does 1 mol of O2 gas have?
A.15.99 x2g
B. 15.99g
C. 2x (6.02x10^23)g
D.15.99 x (6.02x10^23)g
Answer:
D
Explanation:
We already know oxygen's mass is 15.99 amu, and the mass of a mole is 6.02 * 10^23, so just multiply the two together for 15.99 * (6.02 * 10^23) g.
15.99 x (6.02x[tex]10^{23}[/tex])g mass does 1 mol of O2 gas have. Hence, option D is correct.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
We already know oxygen's mass is 15.99 amu, and the mass of a mole is 6.02 x [tex]10^{23}[/tex], so just multiply the two together for 15.99 x (6.02x[tex]10^{23}[/tex])g.
Hence, option D is correct.
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