Heavy metals such lead and arsenic does cause damage to human DNA.
Industries which release heavy metals into land and water ecosystems should be penalized.
However, the exposure of these heavy metals damage the body due to the by inhibiting proteins in DNA pathways during repairs.
What are the effects of exposure on heavy metals?The side or adverse effects of exposure of heavy metals have great risk to the well being of humans. Among these effects are as follows:
It causes certain disorders in the nervous system of humansIt affects the respiratory systemIt affects the circulatory systemSo therefore, heavy metals such lead and arsenic does cause damage to human DNA.
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Many metallic catalysts, especially precious metal catalysts are deposited as thin films on materials with a very high surface area. Why is this an effective way of utilizing the precious metal? (You can choose more than one)
a. If the catalyst is only present in a very thin layer, not very much is needed. This saves money.
b. Surface-deposited catalysts do not work; the whole catalyst material must be homogenous.
c. The material on which the catalyst is deposited causes alternative reactions to occur which would end up reducing percent yield.
d. Only the surface material reacts, so having the entire material be made of the catalyst is not necessary.
D. only the surface material reacts, so having the entire material be made of the catalyst is not necessary.
How does surface area affect reaction of a catalyst?
Increasing the surface area of a catalyst increases the frequency of collisions and increases the reaction rate.
Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.
Thus, it is important way of utilizing the catalyst because only the surface material reacts, so having the entire material be made of the catalyst is not necessary.
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Match each type of rock with the way it is formed.
pressure and heat
cooling magma
erosion and deposition
cooling lava
intrusive igneous rock
arrowRight
extrusive igneous rock
arrowRight
sedimentary rock
arrowRight
metamorphic rock
The correct match is as follows:
Pressure and heat - Metamorphic rock
Cooling magma - The Intrusive igneous rock
Cooling lava - The Extrusive igneous rock
Erosion and Deposition - Sedimentary rock
This is because Metamorphic rocks are formed as a result of past existing rocks changing form. If the igneous and sedimentary rocks are exposed to high temperature and pressure, they then become metamorphic rocks.
Intrusive igneous rocks form when magma cools slowly. This process soon results in the formation of large-crystal like structures. Whereas, when exposed to the atmosphere lava cools rather quickly. This faster cooling process forms extrusive igneous rocks. The fast cooling lava creates smaller crystals and a smoother surface.
The sediments that are formed as a result of weathered rocks are usually deposited on the surface of Earth, or at the bottom of rivers and oceans. Over time, sediments collect and form layers over the most recent layer. This leads to the formation of sedimentary rocks.
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Answer:
I believe this is your answer, or wait I know this is your answer
Explanation:
Which of the following statements is TRUE about graphic scores?
A. Graphic scores can only be written on manuscript paper
B. The performer can interpret the score however he/she wishes
C. Graphic scores cannot show dynamic changes
D. The composer is not allowed to make suggestions regarding the performance
Answer: I think its B
Explanation:
please lmk if I'm wrong.
An atom has 5 protons, 6 neutrons, and 6 electrons. What is the charge of the atom?
Answer:
1-
Explanation:
the charge of an atom is determined by the number of protons and electrons present, in this case the number of electrons is more than the protons by 1, hence it is a minus 1 charge
What does the first law of thermodynamics say?
According to the first law of thermodynamics, the total energy of a system, including its surrounds, is conserved if heat is acknowledged as a kind of energy.
The study of thermodynamics looks at the connections between heat, work, temperature, and energy. The movement of energy from one place or form to another is the main focus of thermodynamics. The underlying concept is that heat is a form of energy that may be compared to a certain amount of mechanical work.
The heat was not formally recognized as a form of energy until around 1798, when British military engineer Count Rumford (Sir Benjamin Thompson) discovered that endless amounts of heat could be produced while boring cannon barrels and that the amount of heat produced is proportional to the work done while turning a blunt boring tool. Rumford's finding of the relationship between heat produced and work completed served as the theoretical cornerstone for thermodynamics.
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After observing substance 1 in liquid, gaseous, and solid states, describe the connection between those states and the thermal energy that was applied or taken away from the substance as the temperature was changed.
For the given substance when thermal energy was applied the change of state that occurred was from solid to liquid, to gas state, and when heat was taken away from the substance, the substance moved from gas to liquid, to solid state.
What is change of state?Change of state refers to the process whereby matter changes from one state to another as heat is added or removed from a substance.
When heat is added to a substance, the particle changes from a more ordered state such as solid or liquid, to a less ordered state such as liquid or gas.
On the other hand, heat is removed from a substance, the particle changes from a less ordered state such as gas or liquid, to a more ordered state such as liquid or solid.
A give substance can exists either in the solid, liquid, or gaseous state depending on the temperature.
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In their resting state, all body cells exhibit a resting membrane potential ranging from -50 to about +50 millivolts.
Question 21 options:
True
False
In their resting state, all body cells exhibit a resting membrane potential ranging from -50 to about -100 millivolts. So, the statement is false.
What is Body cells?The fundamental units of all living things are cells. There are many billions of cells in a human body.
They give the body structure, consume nutrients from meals, transform those nutrients into energy, and perform certain tasks.
All bodily cells are polarised because they all have a resting membrane potential when they are at rest.
All body cells, depending on the kind of cell, have a resting membrane potential that normally ranges from -50 to -100 millivolts. All cells are considered to be polarised as a result.
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which of the following explains why scientists assume that the law of universal gravitation is true on all of the planets in the Solar System
Scientists assume that the law of universal gravitation is true on all of the planets in the Solar System because The planets are always moving perpendicular to the Sun's gravitational attraction, which causes them to follow an elliptical route around it.
According to Newton's universal law of gravitation Every particle in the universe is said to attract every other particle with a force along a line that connects them.The force is inversely proportional to the square of the distance between them and directly proportional to the sum of their masses.F = G(m₁ × m₂ /r²)Where, F is gravitational force between two bodies.
m₁ and m₂ are masses of the bodies.
r is the separation between the two bodies' centres.
G is universal gravitational constant = 6.673 x 10⁻¹¹Nm²/kg².
Big or little, the Law is applicable to all objects having masses. If the distance between two massive objects is very large to their sizes or if they are spherically symmetric, they can be thought of as point-like masses.Thus law of universal gravitation is true on all planets.
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Which of the following is an example of a covalent bond?
a. K-CI
b. AI-CI
c. H-CI
d. Al-Al
Answer:
al - al i think
Explanation:
For the peptide Ala-Arg-Lys-Ala-Asn-Ser-Ala-Ser, what would be the expected charges at pH 1, 7, and 13?
The peptide Ala-Arg-Lys-Ala-Asn-Ser-Ala-Ser, the expected charges at pH 1, 7, and 13 is +3, +2, -1.
What are peptides?
Peptides can be defined as a single linear chain of many amino acids, held together by an amide bonds. It can also be defined as a naturally occurring short chain of amino acid monomer connected by an amide bonds.
The amino acid and other molecular are connected to one another in a sequence by a bond is called peptide bonds.
Peptides make bond and make certain proteins which are very essential for growth and development of human body.
In peptide Ala-Arg-Lys-Ala-Asn-Ser-Ala-Ser ionizing groups are present.
There are four ionizing groups are present
The amino groupThe Arginine R groupThe Lysine R group andThe carboxyl groupThus, the peptide Ala-Arg-Lys-Ala-Asn-Ser-Ala-Ser, the expected charges at pH 1, 7, and 13 is +3, +2, -1.
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What is a control group used for?
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Find volume, mass and density of object?
Given 30.30 grams and 30.32 grams
The volume of object is 0.99 L
Here, the given mass of the object is 30.30g
Given density of the object is 30.32g/L
Density = Mass / volume
⇒ volume = mass/density
=30.30g / 30.32g/L
=0.99 L
Density is the measures how tightly a material is packed together.
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The first ionization energy, , of a helium atom is 2.37×103 kJ/mol . What is the wavelength of light, in nanometers, that is just sufficient to ionize a helium atom?
The wavelength that is sufficient to ionize the helium atom is 510 nm.
What is the ionization energy?Let us recall that the ionization energy is the energy that is required to remove an electron from an atom. The first ionization energy is the energy that is required to remove the first electron from an atom. The electron is often removed from the valence shell of the atom.
We have the following information;
Energy of the electron = 2.37×10^3 kJ/mol * 1 mole/6.02 * 10^23
= 3.9 * 10^-18 J
Now;
E = hc/λ
E = energy of the photon
h = Plank's constant
c = speed of light
λ = wavelength
λ = hc/E
λ = 6.6 * 10^-34 * 3 * 10^8/3.9 * 10^-18 J
λ = 5.1 * 10^-8 m or 510 nm
Hence, the wavelength that is sufficient to ionize the helium atom is 510 nm.
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Suppose that Trial I in this lab was run using 0.10 M NaOH, producing a linear kinetics graph with best-fit equation y = -0.00275 x + 0.222. If Trial Il was run using 0.20 M NaOH, what would the slope of the same graph be if the reaction were (a) zero order, (b) first order, or (c) second order?
For different order Kinetics the lineer graph is different plots.
For Zero order reaction, the integrated rabe law is
[A] = [A]₀-Kt K =rate constant
[A] vs t graph is straight line with slope = -k
For first order reaction, the integrated rate law is
In [A] = In [A]o - Kt
In [A] vs t graph is straight line with slope = -K
For second order reaction, the integrated rate law is
1/[A]= 1/ [A]o + Kt
1/[A] vs t graph is straight line with slope = +k
So, for all cases the slope of straight line is either +k or -K.
k'is rate constant only depends on temperature not on concentration of reactant.
So the slope will not change for Trial II with 0.2m Naoh.
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Would barefoot footprints be considered trace or physical evidence?????
Answer:
I would say Physical Evidence.
Explanation:
I am not so sure, so you can look up trace evidence versus physical evidence, and decide what barefoot footprints would fall into.
Heating 235 g of water from 22.6°C to 94.4°C in a microwave oven requires 7.06 × 10^4 J of energy. If the microwave frequency is 2.88 × 10^10 s−1, how many quanta are required to supply the 7.06 × 10^4 J?
3.699×10²⁷ quanta are required to supply 7.06×10⁴ J of energy.
How is quanta of energy calculated?Quanta of energy is calculated by using the Planck's equation which is given as,
E=hυ
where E= energy of radiation
h=Planck's constant
υ=frequency of radiation
Number of quanta can be calculated as.
=energy of radiation/energy required
As per the given data,temperature is not required in solving the problem
required energy =7.06×10⁴
microwave frequency=2.88×10¹⁰s[tex]^-1[/tex]
Energy of radiation is calculated by using Planck's equation,
=6.626×10[tex]^-34[/tex]×2.88×10¹⁰=19.082×10[tex]^-24[/tex] J.
Number of quanta required=7.06×10⁴/19.082×10[tex]^-24[/tex]=3.699×10²⁷
Hence, the number of quanta required is 3.699×10²⁷.
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Unless otherwise informed report each
numerical answer in standard notation to 3
significant figures. point Pick the choice that
is the most reasonable metric measurement
for the mass of a bullet
a)420 mL
b) 420 ng
c)420 Gg
d)420 g
e)420 cg
Find the molarity of 0.600 mol of BaCl2 in 100.0 mL of solution
The molarity of a 0.600 mol of BaCl₂ in 100.0 mL of solution is 6M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity of a solution can be calculated by dividing the number of moles by the volume as follows:
Molarity = no of moles ÷ volume
According to this question, 0.600 moles of BaCl₂ in 100.0 mL of solution. The Molarity can be calculated as follows:
Molarity = 0.600 mol ÷ 0.100 L
Molarity = 6M
Therefore, the molarity of a 0.600 mol of BaCl₂ in 100.0 mL of solution is 6M.
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If a soccer ball's mass is 5 kg and a player who weighs 50 kg kicks the soccer ball forward with a force of 5 N, how much
force does the ball exert on the player's foot and in what direction? (1 point)
O 10 kg/N backward
O 100 kg forward
O 5 N backward
O 5 N forward
If a soccer ball's mass is 5 kg and a player who weighs 50 kg kicks the soccer ball forward with a force of 5 N , 5 N force does the ball exert on the player's foot and in backward direction .
The four forces are gravity, normal force , friction force, and applied force. When the ball is kicked or kicked by player , when a player leaps into the air to avoid a tackle or grab the ball, and when a player leaps into the air to catch the ball , Force of Gravity is continuously at work in football .
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Answer:
Explanation:
1.) A car’s engine provides a forward force of 2000 N while the force of air resistance is 800 N in the opposite direction. With what force will the car move, and in which direction?
ANSWER: 1200 N forward
2.) Two movers are attempting to push a couch up a ramp. One mover applies a force of 80 N to the right, but the force of friction between the couch and the ramp is providing a force of 110 N in the opposite direction, and the couch slides down the ramp. At minimum, how much force will the second mover need to apply to help push the couch up the ramp?
ANSWER: 31 N
3.) A group of students conduct an experiment to study Newton’s second law of motion. They applied a force to a toy car and measure its acceleration. The table shows the results.
Force (N) Acceleration (m/s²)
2.0 5.0
3.0 7.5
6.0 15.0If the students graph the data points, which conclusion will they be able to make?
ANSWER: The data points will fall along a line. This shows that as the force increases, the acceleration increases.
4.) In the experimental setup shown, a car has one end of a string attached to it, and the other end is attached to a fixed number of metal discs. The car moves along the table and two probes sense the motion of the car. The probes send information to a computer that displays the acceleration and velocity of the experiment. When looking at these results, which quantity stays constant during the trials?
ANSWER: mass
5.) Imagine a scenario in which an animal's force is pushing itself forward 5 N, friction is pushing it 4 N backward, gravity is pushing the animal 10 N down, and the animal is pushing itself 10 N up. Describe the movement of the animal.
ANSWER: It only moves forward because there is a net force forward.
6.) Two rockets with the same mass are accelerated. Rocket A accelerates twice as quickly as rocket B. Which statement is correct?
ANSWER: The motor in rocket A is twice as powerful as the motor in rocket B.
7.) A model rocket has a mass of 0.2 kg, with a motor that can provide a force of 100 N. A second model rocket is being built with the same motor, but it is being designed to accelerate half as much as the first rocket. What kind of change can be made in the design to achieve this objective?
ANSWER: The mass of the second rocket should be 0.4 kg.
8.) Five motorboats are being tested to see which reaches the highest velocity in the same amount of time. After graphing the acceleration versus force for each motorboat, the graph is a sloped line with a y-intercept of zero. Which statement is correct about these motorboats?
ANSWER: All five motorboats have the same mass, which can be calculated from the graph.
9.) If a soccer ball’s mass is 5 kg and a player who weighs 50 kg kicks the soccer ball forward with a force of 5 N , how much force does the ball exert on the player’s foot and in what direction?
ANSWER: 5 N backward
10.)
A toy helicopter flies forward with a force of 15 N into an oncoming wind of 10 N. The force of gravity pulls the helicopter down with a force of 5 N, but the propeller is providing an upward force of 10 N. Which of the following accurately describes the helicopter’s force?
ANSWER: The toy helicopter is flying forward with a force of 5 N and upward with a force of 5 N.
11-15 are short answer questions but I hope this helps whoever needs it <3
1.60mL of ethanol in microliters
Answer:
1600 microliters
Explanation:
µl =mL ÷ 0.0010000 so 1.60÷0.00010000=1600
What is the ph scale including acid and base number ranges
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Would someone be able to explain why these answers here are correct? I don't quite understand them and needed some explanation. Thanks
Bromine have two isotopes they are Br-79 and Br-81. these are the two stable isotopes.
So here from the given data, element bromine consists of Br₂ molecules. here they have given three mass spectrum peaks.
Mass spectroscopy detects ions of slightly different masses. the bromine molecules consist of two isotopes that is ⁷⁹Br and ⁸¹Br or maybe more combination of theses.
So from the given masses and and spectra we know that the two isotopes of bromine are ⁷⁹Br and ⁸¹Br. That's why they are given like that in the answer.
Isotopes are those elements which have same number of protons but different number of neutrons.
Because of this in part A the answer is given as ⁷⁹Br, ⁷⁹Br and in part B it is given as ⁷⁹Br ,⁸¹Br. this is the common way of representing the mass number of an element.
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Sequence
5. How is a mechanical
wave produced?
A wave is produced
when something
Each
produces a wave.
Waves keep
moving even
after the
stops.
A disruption or vibration in matter, whether solid, gas, liquid, or plasma, is what generates mechanical waves.
How does a mechanical wave work?Mechanical waves are caused by a disruption or vibration in matter, whether it is solid, gas, liquid, or plasma.Mechanical waves are waves that travel through a solid, liquid, or gas at a rate determined by the elastic and inertial properties of the medium. Mechanical waves, which are the two most common wave motions, can move in either longitudinal or transverse directions. The transmission of energy through a medium is caused by an oscillation of matter known as a mechanical wave. The transmission medium limits the distance a wave can travel. There is almost no translational motion in this case, and the oscillating material rotates around a fixed point.To learn more about : mechanical wave
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g hfghhfhfhffhfhhfhffhhffhhfgfgf
this place is for serious matters only not jokes.
Two movers are attempting to push a couch up a ramp. One mover applies a force of 80 N to the right, but the force of friction
between the couch and the ramp is providing a force of 110 N in the opposite direction, and the couch slides down the ramp.
At minimum, how much force will the second mover need to apply to help push the couch-up the ramp?
(1 point)
O 30 N
O 110 N
0 31 N
O 80 N
Answer:
31 N
Explanation:
4) A pure metal and an interstitial alloy containing the same metal were examined. Predict which
substance will have a greater density and justify your selection.
The interstitial alloy would be more dense than the pure metal.
What is density?Density is the ratio of the mass to the volume of an object. Now we know that the more dense the object is the more the atoms of the object are packed together.
An alloy is a combination of two or more metals. This implies that in an alloy we are certainly going to have more elements packed into a smaller space than in a pure metal. The pure metal contains only one type of atoms but the alloy contains more than one type of metal atoms packed into a small space.
Thus, the interstitial alloy would be more dense than the pure metal.
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What is the frequency
Answer:
The frequency is the rate at which current changes direction per second.
Which of the following generally applies to the noble gases?
a. high ionization energy, low electronegativity, high reactivity
b. low ionization energy, low electronegativity, low reactivity
c. high ionization energy, high electronegativity, high reactivity
d. high ionization energy, low electronegativity, low reactivity
How many Al3+ ions are there in 0.500 g of Al2(SO4)3?
The number of particles of Al³⁺ present in the given compound is 1.76 x 10²¹ ions.
Mass of the aluminum ion
The mass of the aluminum ion in the given compound is calculated as follows;
Al₂(SO₄)₃ ⇄ 2Al³⁺ + 3SO₄²⁻
mass of Al₂(SO₄)₃ = 342.15 g
number of 0.5 g = 0.5/342.15 = 0.00146 mole
from the reaction equation above;
1 mole of Al₂(SO₄)₃ = 2 moles of Al³⁺
0.00146 mole = ?
= (0.00146 x 2)/1
= 0.00292 mole
1 moles of ion = 6.02 x 10²³ particles
0.00292 moles = ?
= 1.76 x 10²¹ ions
Thus, the number of particles of Al³⁺ present in the given compound is 1.76 x 10²¹ ions.
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By placing this passage at the beginning of the story, the author builds suspense for the arrival of
.