Answer:
Yes
Explanation:
Some environmental factors- chemical, physical (UV), and biological (poisonous plants)- have the capability to damage DNA. This can lead to mutation, cell death, and several ailments.
Chemicals such as pesticides and heavy metals can be found in the environment (air, water) or in some consumer products.
The presence of Lead and a reactive oxygen species can result in DNA damage. Arsenic is classified as a carcinogen (cancer-causing substance).
More details are found in scientific articles online, but here's a helpful snippet- "heavy metal exposure can contribute to genetic damage by inducing double strand breaks (DSBs) as well as inhibiting critical proteins from different DNA repair pathways"
Lead and arsenic are heavy metals that are considered carcinogens. These metals cause alteration and damage to the genetic material and protein synthesis.
What are carcinogens?Carcinogens are said to be a substance that can lead to cancer in an organism and are produced naturally from viruses and ultraviolet rays or mna made by cigarette smoking and chemicals.
Their high exposure causes the breaking of the double strand of the DNA molecule in the cells that inhibits and prevents protein formation leading to interference with the DNA repair pathways.
Cadmium, lead, arsenic, etc., are heavy metals that are released by human activities and alter the genetic mechanism and composition leading to mutation and disorders like skin cancers, lung cancer, etc.
Therefore, lead and arsenic is carcinogens that damage DNA.
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when sodium metal is treated with water we get gas which is absorbed by palladium metal is ?
that gas is called hydrogen gas
At STP, how many moles are in 21.5 L CH4?
Answer:
0.96 mole of CH4.
Explanation:
From a background knowledge of gas laws, we understood that 1 mole of a gas occupy 22.4 L at STP. This implies that 1 mole of CH4 also occupy 22.4 L at STP.
Now, we shall determine the number of mole of CH4 that will occupy 21.5 L at STP. This is illustrated below:
1 mole of CH4 occupied 22.4 L at STP.
Therefore, Xmol of CH4 will occupy 21.5 L at STP. i.e
Xmol of CH4 = (1 × 21.5)/22.4
Xmol of CH4 = 0.96 mole
Therefore, 0.96 mole of CH4 will occupy 21.5 L at STP.
11. Group 17 elements are called.
there is no group 17
Which bond is intermediate in terms of strength? why is it weaker than the strongest? ap bio?
Answer:
Covalent bonds are intermediate in strength and weaker than ionic bonds
Explanation:
Because ionic bonds tend to form a rigid lattice structure that make them more stronger and difficult to remove electrons from them
How might a museum curator be involved in science?
Answer and explanation:
A museum curator is most likely an art conservationist. They would have to determine the age an art piece was developed and ways to preserve older artefacts.
These processes would require the use of chemicals and physical tests, and also research laboratories.
I hope this answer is helpful and clear.
3. An irregularly shaped stone was lowered into a graduated cylinder holding a volume
of water equal to 2.0 ml. The height of the water rose to 7.0 ml. If the mass of the
stone was 25 g, what was its density?
Answer:
Hey there!
The volume rose by 5 ml, and that means the stone has a volume of 5 ml. Thus, the stone has a density of 25/5, or 5 g/cm^3.
Let me know if this helps :)
calculate no of moles in 42g of carbon ?
Answer:
[tex]\huge\boxed{n = 3.5\ moles}[/tex]
Explanation:
Given :
Mass in grams = m = 42 g
Molar Mass = M = 12
Required:
No. of moles = n = ?
Formula :
m = m / M
Solution:
n = 42 / 12
n = 3.5 moles
What are two things required for something to be matter?
what is meant by the term chemical reaction
Answer:
[tex] \huge{ \underline{ \underline { \bold{ \sf{ \orange{See \: below}}}}}}[/tex]Explanation:
▪️[tex] \underline{ \bold{ \sf{ \blue{Chemical \: reaction}}}}[/tex]
⇒The composition , decomposition or displacement of molecules of matter during chemical change is called chemical reaction.
▪️[tex] \underline{ \bold{ \sf{ \purple{ \: Further \: more \: explanation}}}}[/tex]
Various conditions bring about these changes. The chemical reactions are represented by chemicalequation. The compounds or elements that take part in chemical reaction are called reactant. They are written at the left side of an arrow that represent a change while the compound or elements that formed after the chemical change are called product. They are written at the right side of the arrow.
▪️[tex] \underline{ \bold{ \sf{ \purple{For \: example}}}}[/tex]
When nitrogen reacts with hydrogen to form ammonia :
Nitrogen + Hydrogen ⇒ Ammonia
N₂ + 3H₂ ⇒ 2NH₃
Presentation of a chemical reaction in the form of equation is called chemical equation . Chemical equation may be word equations or formula equations.
Hope I helped!
Best regards!!
I need help with number 3 please look at the picture!!
Answer:
Answer is (a)
Explanation:
Question 5
5. CFC's break down
Ozone
carbon dioxide
Oxgygen
nitrogen
Answer:
ozone. CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing chlorine atoms, which are able to destroy ozone molecules.
Answer:
C: Oxygen
Explanation:
When they are exposed to strong ultraviolet light, CFCs finally break down to release lone chlorine atoms with an unpaired electron. These chlorine atoms are highly unstable and react with ozone to break it down into oxygen through a type of chain reaction.
Scientists often investigate alternative explanations for the data and observations presented, even once a hypothesis has been tested and supported through an experiment. This investigation of alternative explanations 1. proves that scientific theories are not able to be disproven. 2. demonstrates that scientific theories are based on opinions. 3. strengthens the evidence and support for a scientific theory. 4. keeps the scientific community competitive and motivated.
Answer:
Explanation:
its 2
what is the mass of 1500ml of ethyl alcohol if the density of the alcohol is 0.789 g/ml
Given :
Volume of ethyl Alcohol = 1500 ml Density = 0.789 g/mlTo Find :
Mass of ethyl alcoholSolution :
Formula for density is :
[tex]\boxed{\sf{Density\ =\ \dfrac{Mass}{Volume}}}[/tex]
⇒0.789 = Mass/1500
⇒ Mass = 0.789 * 1500
⇒ Mass = 1,183.5 g
Hence, Mass of ethyl alcohol is 1,183.5 g.
which two quantities are used to predict gravitational force according to newton's law of universal gravitation
Answer:
Observe how the force of gravity is directly proportional to the product of the two masses and inversely proportional to the square of the distance of separation.
Explanation:
I think im not sure
Chemistry course is intended for what type of students?
Answer:
Chemistry course is intended for students who did not take chemistry in high school or who struggled with high school chemistry.
Explanation:
as a result of the law of conversation of mass a balanced chemical equation must
1. The volume of a given mass of gas is 720 ml at 15°C. Assuming
constant pressure, at what temperature will its volume be 960 ml?
2. A sample of gas is found to occupy a volume of 900 cm3 at 270
°C. Calculate the temperature at which it will occupy a volume of
300 cm3, provided the pressure is kept constant.
please mark my answer brainliest...
condition...pressure remains constant.
for 720 ml temp is 15°...so for 960ml temp will be 15/720×960=20°...(.answer for 1st part...)for 900cmcube temp is 270°C...so for300cmcube temp will be 270/900×300=90°....(answer for 2nd part)...I hope it helps the dear students...and if it is then let me know through ur comments...and please mark my answer as brainliest...plz...1. The temperature at which the volume of gas has been 960 ml is [tex]\rm \bold{19.99\;^\circ C}[/tex].
2. The temperature at which the volume of gas has been [tex]\rm 300\;cm^3[/tex] is [tex]\rm \bold{90^\circ C}[/tex].
1. The gas has been assumed to be an ideal gas. For an ideal gas, the relationship between temperature and volume at constant pressure has been given as:
[tex]\dfrac{V1}{T1}=\dfrac{V2}{T2}[/tex]
Where, the initial volume, [tex]V1=720\;\text {ml}[/tex]
The final volume, [tex]V2=960\;\text {ml}[/tex]
The initial temperature, [tex]T1=15\;^\circ \text C[/tex]
Substituting the values, the final temperature, T2 can be given as:
[tex]\rm \dfrac{720\;ml}{15\;^\circ C}=\dfrac{960\;ml}{\textit{T}2} \\\textit T2=\dfrac{15\;^\circ C}{720\;ml}\;\times\;960\;ml\\\textit T2=19.99\;^\circ C[/tex]
The temperature at which the volume of gas has been 960 ml is [tex]\rm \bold{19.99\;^\circ C}[/tex].
2. The temperature for gas to occupy [tex]\rm 300\;cm^3[/tex] has been given as:
Where, the initial volume, [tex]V1=900\;\rm{cm^3}[/tex]
The final volume, [tex]V2=300\;\rm {cm^3}[/tex]
The initial temperature, [tex]T1=270\;^\circ \text C[/tex]
Substituting the values, the final temperature, T2 can be given as:
[tex]\rm \dfrac{900\;cm^3}{270\;^\circ C}=\dfrac{300\;cm^3}{\textit{T}2} \\\textit T2=\dfrac{270\;^\circ C}{900\;cm^3}\;\times\;300\;cm^3\\\textit T2=90\;^\circ C[/tex]
The temperature at which the volume of gas has been [tex]\rm 300\;cm^3[/tex] is [tex]\rm \bold{90^\circ C}[/tex].
For more information about the volume of gas, refer to the link:
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The scientific method is an order of steps that is followed and the first step of scientific inquiry is often ____________________________________
Group of answer choices
Design the experiment
Interpret data
develop a hypothesis
Developing the problem
Answer:
Developing the problem
Explanation:
In order to have an experiment or to make the experiment's data useful, you must first find a problem to solve.
which unit of measurement is used in the metric system miles kilograms gallons tons
Answer:
Kilograms
Explanation:
The metric system denotes their measurements with prefixes (kilo)
at 25*C, the vapor pressure of pure water is 23.8 torr. a solution is prepared by dissolving 0.30 mol Na2SO4 in 8.0 moles of water. what is the vapor pressure of this solution at 25*C
Answer:
Vapor pressure of the solution is 22.9 torr at 25°C
Explanation:
When a non volatile solute is added to a pure solvent, the vapour pressure of the mixture decrease regard to the pure solvent following the equation (Raoult's law):
[tex]P_{solution}=X_{solvent}.P^0_{solvent}[/tex]
Where vapour pressure of the pure solvent (Water) is 23.8torr at 25°C.
Mole fraction of water is the ratio between moles of water and total moles in solution. The solution has a mole fraction of water of:
[tex]X_{water}=\frac{8.0Moles_{water}}{0.30mol_{Na_2SO_4}+8.0mol_{water}} = 0.9639[/tex]
Replacing in Raoult's law:
[tex]P_{solution}=0.9639*23.8torr[/tex]
Vapor pressure of the solution is 22.9 torr at 25°Cwhat is the importance of cell membrane
Answer:
the membrane forms an outer boundary of the cell and, as such, holds the cell together. The membrane is also pliable, which means it can move and flex in response to the surrounding environment. The fluid nature of the membrane is important because it allows the cell to survive in various environments.
Explanation:
understand yourself!
Which equation describes the mass of an object in relation to its volume and density? a. m=DV b. m=D×V c. m=D+V d. m=VD
Answer:
B
Explanation:
the formula is d=m/v
both sides xV
dv=m
The equation describes the mass of an object in relation to its volume and density is m=D×V. option B is correct.
What is density?
The density of a substance is the mass of per unit volume of a substance or any object and the density will be equal to the division of mass of the substance to the volume of the substance and its SI unit will be cubic centimeter.
The equation of mass can be calculated by the help of the formula of density too. so, the mass will be the multiplication of the density of a substance and the volume of the substance and the unit will be kilogram.
Therefore, equation describes the mass of an object in relation to its volume and density is m=D×V. option B is correct.
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How many moles of lithium hydroxide would be required to produce 35.0 g of Li₂CO₃ in the following chemical reaction? 2 LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
Answer:
0.947 mol LiOH
Explanation:
2 LiOH + CO₂ ⇒ Li₂CO₃ + H₂O
Convert grams of Li₂CO₃ to moles. The molar mass is 73.891 g/mol.
(35.0 g Li₂CO₃)/(73.891 g/mol Li₂CO₃) = 0.4737 mol Li₂CO₃
Use the mole ratio between LiOH and Li₂CO₃ to covert moles of Li₂CO₃ to moles of LiOH.
0.4737 mol Li₂CO₃ × (2 mol LiOH/1 mol Li₂CO₃) = 0.9474 mol LiOH
Round for proper significant figures.
0.9474 ≈ 0.947 mol LiOH
3. The sum of gravitational potential energy and kinetic energy is called mechanical
energy. Use Figure 2 to find the mechanical energy of an idealized pendulum at a
variety of times in its cycle. Identify any pattern you notice in the values of
mechanical energy.
Pls helpp
Answer:
Explanation:
Mechanical energy = Kinetic energy + Potential energy
We shall calculate mechanical energy at different points of time .
Time Kinetic energy Potential energy mechanical energy
0 0 4 4
2 2 2 4
4 4 0 4
6 2 2 4
8 0 4 4
10 2 2 4
and so on ........
Hence we see that total mechanical energy is constant at the value of 4
at all time .
What 3 athletic events do not use the SI unit of measurement
Answer:
Long jump doesn't use the SI unit of measurement
The Periodic Table is organized into or by _________________. A. All of these B. Groups C. Increasing atomic number D. Properties
Answer:
My best bet is to go with A. All of these
Please help with this exercise
Answer:
neutralization is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.
the ore copper is extracted from: Chalcopyrite
The process or result of oxidizing or being oxidized.
the action or fact of making a specified thing smaller or less in amount, degree, or size.
I can't answer the other ones. sorry
Which state of matter has the leader molecular motion explain your answer
Someone please answer this one as soon as you see it thank you so much for your time
Review
1 Why is gold considered to be valuable?
2. Who owned the gold mines during the ancient Egyptian and Roman civilizations?
3. What is the elixir of life?
4. What contributions to modern chemistry were made by the alchemists?
Answer:
1. Gold is valuable because of its high quality physical and chemical properties
2. The gold mines where the state's property in both Egyptian and Roman civilizations
3. The elixir of life is akin to the philosopher stone. It is a chemical portion that when drank, grants eternal life
4. The contribution of alchemists to modern chemistry, includes the formulation of the first ideological periodic table, the distillation process, metalworking, gunpowder, glass, ink, paints, cosmetics and many other innovations
Explanation:
Question 2 (4 points)
(01.06 LC)
Air is an example of a mixture because the elements and compounds that make up air retain their individual properties. (4 points)
True
Or False
Answer:
True
Explanation:
They do retain their individual properties.