A chemical reaction is the only way to separate a pure substance because in terms of chemical composition, an element can't be broken down any more further, or separated. Some mixtures and solutions can be broken down with physical means, not just chemical reactions.
A Pure substance is only separated by a process of chemical reaction.
What is a Pure Substance?Pure substances are composed of only one kind of particle and have a constant or unchanging structure.
Elements and compounds are subclasses of pure substances:
An element is a substance that only contains one kind or class of atoms. An element is a pure material if it cannot be broken down or converted into other compounds by physical or chemical mechanisms. Metals, nonmetals, or metalloids make up the vast bulk of elements.
On the other hand, when two or more elements are chemically combined in a specific ratio, compounds can also be considered pure substances. However, these substances can be split up into their component parts through chemical processes.
To break down pure substances (elements and compounds) into their individual atoms or elements, a chemical reaction must take place.
Physical techniques cannot distinguish between pure substances.
Hence, Pure substance is only separated by a process of chemical reaction.
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is this app good and answer comes instantly!!
Of course yes =D
It is a useful app for students and for teachers =D
Best regards
Hi! ⭐️
This app sure does help, maybe their will be kids sometimes that joke around but then overall they answer correctly!
Hope this helped!
Have a wonderful day! ♥️
what does the acronym Dash stand for
DASH is an acronym for Dietary Approaches to Stop Hypertension.
It stands for Dietary Approaches to Stop Hypertension. Hope I was able to help you. :)
what does a resistor do in a circuit?
lowers the amount of voltage going through a circuit
If there is but one resistor in the circuit, it will limit the current flow according to E = I*R
If there are two resistors in series in the circuit, they will affect a voltage divider.
Though you haven't asked for it, the voltage drop across the 3 ohm resistor is E = I*R
I = 5 amps
R = 3 ohms
E = 5 * 3 = 15 Volts
And through the 2 ohm resistor, you get
I = 5 amps
R = 2 ohms
E = 2*5
E = 10 volts.
So the total is 10 v + 15 v = 25 volts
Each resistor then has a reading in voltage across it. That is called a voltage divider.
===========
One "resistor" like a light bulb is made to give light and also to limit the current.
The specific heat capacity of a substance is the amount of energy associated with doing which of the following to 1kg of the substance?
Answer:
Raising its temperature by [tex]1^{\circ}C[/tex]
Explanation:
The specific heat capacity of a substance is defined as the amount of energy needed to raise the temperature of 1 kg of a substance by [tex]1^{\circ}C[/tex].
The specific heat capacity of a substance essentially tells us how much energy is needed to heat the substance: the larger it is, the more energy is needed. The amount of energy needed to increase the temperature of a substance is given by
[tex]Q=mC_s \DeltaT[/tex]
where
m is the mass of the substance
Cs is the specific heat capacity
[tex]\Delta T[/tex] is the temperature variation of the substance
Answer:
Raising its temperature by 1 C
Explanation:
A P E X
Which three statements about electromagnetic radiation are true?
-- Light is electromagnetic radiation.
-- Electromagnetic radiation has no mass.
-- Electromagnetic radiation can travel through vacuum.
Answer:
Option (1), (3) and (4) are correct.
Explanation:
When the oscillating electri and magnetic field interacts perpendicularly to each other, the electromagnetic radiations are produced. The electromagnetic radiations propagates in the perpendicular direction of both electric and magnetic field vectors.
For example, gamma rays, X rays, ultra violet rays, visible radiations, infrared rays, micro waves and radio waves.
Electromagnetic radiations do not require any medium for their propagation.
They do not carry mass, they carry energy only.
how is force related to acceleration and gravity?
Newton's second law of motion describes the relationship between force and acceleration. They are directly proportional. If you increase the force applied to an object, the acceleration of that object increases by the same factor. In short, force equals mass times acceleration.
Final answer:
Force is related to acceleration and gravity through Newton's second law of motion, where F = ma. Gravity causes objects to accelerate towards Earth at a constant rate of 9.8 m/s², regardless of mass. In scenarios like free fall, simple relations like v = u + at show the direct relationship between force and acceleration.
Explanation:
Force is related to acceleration and gravity through Newton's second law of motion. The formula representing this relationship is F = ma, where F is the force applied to an object, m is the mass of the object, and a is the resulting acceleration.
Gravity, as described by Newton's universal law of gravitation, causes objects to accelerate towards Earth at a constant rate of 9.8 m/s² near the surface of the Earth, regardless of their mass. This special property of gravity results in all objects experiencing the same acceleration due to gravity.
When considering a constant force and acceleration scenario, such as free fall in a uniform gravitational field without air resistance, simple relations like v = u + at can be derived, demonstrating the direct relationship between force and acceleration.
50 POINTS! A Boy throws a ball horizontally a distance of 22m downrange from the top of a tower that is 20.0m tall. What is his throwing velocity?
The ball's horizontal and vertical velocities at time [tex]t[/tex] are
[tex]v_x=v_{xi}[/tex]
[tex]v_y=v_{yi}-gt[/tex]
but the ball is thrown horizontally, so [tex]v_{yi}=0[/tex]. Its horizontal and vertical positions at time [tex]t[/tex] are
[tex]x=v_{xi}t[/tex]
[tex]y=20.0\,\mathrm m-\dfrac g2t^2[/tex]
The ball travels 22 m horizontally from where it was thrown, so
[tex]22\,\mathrm m=v_{xi}t[/tex]
from which we find the time it takes for the ball to land on the ground is
[tex]t=\dfrac{22\,\rm m}{v_{xi}}[/tex]
When it lands, [tex]y=0[/tex] and
[tex]0=20.0\,\mathrm m-\dfrac{9.8\frac{\rm m}{\mathrm s^2}}2\left(\dfrac{22\,\rm m}{v_{xi}}\right)^2[/tex]
[tex]\implies v_i=v_{xi}=11\dfrac{\rm m}{\rm s}[/tex]
Answer: 11m/s.
Explanation: 11m/s.
Ignore friction and air resistance. If the total mass of the roller coaster cars is 800kg, and the 50,000 N of gravitation force are acting on the roller coaster cars, what is the acceleration of the roller cars?
Force = (mass) x (acceleration) ===> Newton #2
Divide each side by (mass), and then it says:
Acceleration = (force) / (mass)
Acceleration = (50,000 N) / (800 kg)
Acceleration (of gravity) = 62.5 m/s²
.
Now, the only question I have is: WHERE is this coaster ?
The gravity there is almost 6.4 times Earth's gravity.
It's 2.5 times Jupiter's gravity, and 23% of the gravity ON THE SUN !
If you weigh 125 pounds on Earth, you would weigh 7,813 pounds in THAT place. You surely couldn't climb into the coaster or sit in a seat, and the coaster surely could not carry you.
explain the relationship between pitch and frequency.
The pitch of a sound you hear depends on the frequency of the sound wave. A high frequency sound wave has a high pitch, and a low frequency sound wave has a low pitch.
A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave.
As the current in a coil of wire increased, the magnetic field strength what?
Answer:
A coil of wire with an electric current flowing through it becomes a magnet. Putting iron inside a current-carrying coil greatly increases the strength of the electromagnet. Changing magnetic fields induce electric currents in copper and other conductors.
A 0.6 kg basketball with a velocity of +6 m/s rolls toward a 0.2 kg ball of clay with a velocity of +1 m/s. If the balls collide and stick together, what is the velocity following the collision?
7 m/s I believe I would check with your teacher if anything
Each color has its own frequency and wave length? True or false
Each color does have it's own frequency an wave length.
Which has a greater momentum? A 1200kg car traveling at 30m/s or a 2000kg truck traveling at 20m/s
Momentum is found by multiplying the mass of the object by the velocity.
1200 x 30 = 36,000 Newtons
2000 x 20 = 40,000 Newtons.
The 2,000kg truck has greater momentum.
Frogs need water to lay their eggs. It has not rained for many months. The lake is getting smaller. Billy does not see many tadpoles at the lake because A) the frogs have laid fewer eggs. B) the lake is overcrowded with fish. C) the fish ate all of the frog eggs. D) the frog eggs won't hatch in hot weather.
Either Answer Choice A Or D
Answer:
THE ANSWER IS A
Explanation:
The diagram shows a spherical wave.
Which letter represents a wavelet?
A. W
B. X
C. Y
D. Z
the answer to this question is y
Answer:
Y
Explanation:
According to Huygen's principle, each point on a wavefront is a source of wavelets which generates the next wavefront.
In the given diagram, point source of light that is the primary source is represented by W. X and Z are wavefronts. The points marked on X are point source of wavelets. On Z, a wavelet is represented by Y. The wavelets spread out in forward direction. The envelope of wavelets forms a wavefront.
The diameter of the moon is a little less than the distance across the United States. Please select the best answer from the choices provided T F
Answer:
true
Explanation:
The diameter of the Moon is 3474 km. The distance across the United States, from Florida to Washington, is 4509.382 km.
It is true that the diameter of the moon is a little less than the distance across the United States.
Answer: Option A
Explanation:
Moon is the natural satellite of our Earth. It revolves around the Earth due to the gravitational force acting on the moon. The moon also has its own gravitational force. The gravitational force of moon is [tex]\frac{1}{6} t h[/tex] of the gravitational force on Earth.
The mass of moon is [tex]7.34 \times 10^{22}[/tex] kg while the mass of the Earth is [tex]5.972 \times 10^{24}[/tex] kg. So the moon’s mass is very very less than that of Earth. So the diameter of moon is found as 3,472 km while the diameter of Earth is 12,742 km.
Thus the dimension of moon is [tex]\frac{1}{4} t h[/tex] of the dimension of the Earth. Even the diameter of moon is little less than the distance across the United States as the distance across United States is 4509 km.
what coefficient of KCI
Explanation:
Start with the unbalanced equation:
KClO
3
→
KCl
+
O
2
A method that often works is to balance everything other than
H
and
O
first, then balance
O
, and finally balance
H
.
Another rule is to start with what looks like the most complicated formula.
The most complicated formula looks like
KClO
3
.
We put a
1
in front of it and mark the
1
to remind ourselves that the number is now fixed.
We can't change a coefficient unless we run into a roadblock (like having to use fractions).
My teacher never let me use fractions.
My solution when I hit a roadblock was to erase all the numbers and then start over again with a 2 as the starting coefficient.
We start with
1
KClO
3
→
KCl
+
O
2
Balance
K
:
We have 1
K
on the left, so we need 1
K
on the right. We put a
1
in front of the
KCl
.
1
KClO
3
→
1
KCl
+
O
2
Balance
Cl
:
Cl
is already balanced, with 1
Cl
on each side.
Balance
O
:
We have 3
O
atoms on the left and only
2
on the right. We need 1½
O
2
molecules on the right. Uh, oh! Fractions!
We start over with a 2 as the coefficient.
2
KClO
3
→
2
KCl
+
O
2
Now we have 6
O
atoms on the left. To get 6
O
atoms on the right, we put a 3 in front of the
O
2
.
2
KClO
3
→
2
KCl
+
3
O
2
Every formula now has a fixed coefficient.
We should have a balanced equation.
Let’s check:
Left hand side: 2
K
, 2
Cl
, 6
O
Right hand side: 2
K
, 2
Cl
, 6
O
All atoms balance.
The balanced equation is
The coefficient of KCl in a dissolution reaction is '1'. The question may be mixing up the concept of KCl dissolution with equilibrium constants for other reactions, such as CO2 with water. A chemical context is needed to provide a specific coefficient for KCl.
Explanation:The question what coefficient of KCl appears to be asking for the coefficient (stoichiometric number) in front of the chemical formula KCl in a balanced chemical equation. However, to provide a specific coefficient, there needs to be a context of a complete chemical reaction. If the reaction is simply the dissolution of KCl in water, the coefficient is typically '1' because the dissolution equation would be KCl(s) → K+(aq) + Cl-(aq), with each ion being produced in a 1:1 ratio.
In chemistry, equilibrium constants, such as the solubility product constant (Ksp) for salts like KCl, are crucial for understanding the solubility and dissociation of compounds. The Ksp for KCl would be the product of the concentrations of the K+ and Cl- ions at equilibrium. The value of K you mentioned corresponds to the equilibrium constant for the reaction between carbon dioxide and water, which is different from the solubility product of KCl.
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John's grandfather clock has a pendulum that keeps the seconds. What does this graph say about the observed pattern of motion?
A) The pendulum swings with a constant velocity.
B) The vacillating periodic motion changes sign.
C) The pendulum displays a constant acceleration.
D) The oscilations show a variable rate of motion.
Option A: The pendulum swings with a constant velocity.
The pendulum is swinging back to center at position 2 m and time 8 sec.
when you mix sugar into water in a beaker the sugar is no longer visible. what happens in the beaker
the sugar dissolves, but is still there, just not visible
A horse performs 2600 joules of work pulling a wagon for 13 seconds. What is the horse's power? 33800 W 200 W 0.005 W 2600 WA horse performs 2600 joules of work pulling a wagon for 13 seconds. What is the horse's power?
33800 W
200 W
0.005 W
2600 W
Answer:
200 W
Explanation:
The power is given by the ratio between the amount of work done and the time taken to perform the work:
[tex]P=\frac{W}{t}[/tex]
where in this problem we have
W = 2600 J is the work done
t = 13 s is the time taken to do the work
Substituting the numbers into the equation, we find
[tex]P=\frac{2600 J}{13 s}=200 W[/tex]
Answer:
200 W
Explanation:
To figure out the power, you need to use the formula: P = work/time. You need to remember that they may ask you for the significant figures, so that is how many digits you have to round by. This question does not specify significant figures.
2600/ 13 = 200
Your answer is 200 watts
All of the following are functions of the sensory somatic nervous system except
it sends signals that control heat rate and respiration
it receives messages and relays stimulus to contract muscle fibers
it receives messages from the central nervous system
it sends messages directly to muscles and glands
Answer:
It sends signals that control heat rate and respiration
Explanation:
We breath without thinking this is because of the the autonomic nervous system. (ANS) is an involuntary system it acts without our conscious control.
The sensory-somatic nervous system do not control heat rate and respiration. Hence, option (A) is correct.
The nervous system containing sensory as well as the motors neurons is known as sensory-somatic nervous system. These are made up of the cranial and spinal nerves that transmit information from the skin, skeletal muscles to the Central Nervous System.
As per the given problem:
(A)
The sensory-somatic nervous system sends signals from skin and muscle to Central Nervous System, but it does not control heat rate and respiration. Hence, this statement is correct (means it is not the function of sensory-somatic nervous system).
(B)
Sensory-somatic nervous system receives messages and relays stimulus to contract muscle fibers. Hence, it is a function and the option is incorrect.
(C)
The sensory-somatic nervous system exchanges the information between the various organs to Central Nervous System. Hence, the option is incorrect.
(D)
At some instant, sending neuro signals directly to muscle and glands is also a function of sensory-somatic nervous system. So, the option is incorrect.
Thus, we conclude that out of all the given options, the sensory-somatic nervous system do not control heat rate and respiration. Hence, option (A) is correct.
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the strong nuclear force is
about the same as the electric force
75 times smaller than electric force
more than 100 times greater than the electric force
Answer is option C.100 times greater than electric force.
in the nucleus ,protons are close to each other ,because of the strength of strong nuclear force.
3. To calculate the _____ of a moving object, divide the displacement by the time interval in which the displacement occurred.
average velocity
instantaneous velocity
initial velocity
negative velocity
Average velocity
Explanation;Average Velocity of a moving body or an object is the ratio of total displacement covered to the time interval during which the displacement occurred. That is; Change in displacement divided by time.The formula, therefore will be;Average velocity = Displacement/ the time interval
Instantaneous Velocity on the other hand is the velocity of an object or a body at some instance.Answer:
Average velocity
Explanation:
Hi, the average velocity of an object is equal to the total displacement of an object divided by the total time spent.
Average velocity = Distance /time
The units used are distance units per time units (for example: meters per second).
Is the rate of the change of position of an object.
Feel free to ask for more if needed or if you did not understand something.
how to find displacement?
To find the displacement, draw a vector from your starting point to your end point and solve for the length of this line.
Hope this helps!
Davinia.
Displacement in physics is the overall change in position of an object. It can be computed using the equation Δx = x₁ - x₀ (final position - initial position). For more complex scenarios, you calculate the area between the velocity-time graph and time axis or use displacement vectors for multi-dimensional scenarios.
Explanation:In Physics, displacement represents the overall change in an object's position. This is different from distance which accounts for the total ground an object covered. To calculate displacement, we need to know the initial and final positions of the object and use the equation, Δx = x₁ - x₀ where Δx is the displacement, x₁ is the final position, and x₀ is the initial position.
For example, If an object moves from position 3m (x₀) to position 8m (x₁), the displacement (Δx) would be 8m - 3m = 5m. This is a simplified example, for complex scenarios where there is varying speed or acceleration, you might need to calculate the area between the velocity vs. time graph and the time axis.
To visualize displacements in more than one dimension, we use displacement vectors. Here you would also need to take direction into account while calculating the overall displacement.
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Why does life be life
Because you don't have your banana milk, broski
...
Life... is a dream.
...
Life... is a story.
...
Life... is a creation of human kind.
...
Life............................ is 42.
Which statement best describes the polarization of light? A. The wave oscillates in all the planes possible. B. The wave does not oscillate. C. The wave oscillates in a single plane. D. The wave oscillates parallel to its direction of motion.
Answer:
A
Explanation:
what is the input force needed to push a 1580 newton snowmobile up a 2.5 long board into the back of a pick-up truck. the bed of the pickup is 1.10 meters high and the board is 80% efficient?
869 Newtons.
ExplanationWhat's the gain in Gravitational Potential Energy in this process?
[tex]\displaystyle \Delta \text{PE} = \underbrace{(m\cdot g)}_{1580\;\text N}} \cdot \Delta h = 1580\times 1.10\;\text{m} = 1738\;\text{J}[/tex].
What's the energy input in this process?
The output of the board is the same as the gain in gravitational potential energy, 1738 Joules.
[tex]\displaystyle W_\text{in} = \frac{W_\text{out}}{\text{Efficiency}} = \frac{1738}{0.8} = 2172.5\;\text{J}[/tex].
[tex]F = \dfrac{W_\text{in}}{d}= \dfrac{2172.5}{2.5} = 869\;\text{N}[/tex].
Which is the magnitude of the vector 13 m/s to the east
I don’t know undertansdsje
Answer:
The correct answer is 13 m/s.
The diagram shows how an image is produced by a plane mirror.
Which letter shows where the image will be produced?
W
X
Y
Z
I had this question on a quiz, it was X.
Answer:
X
Explanation:
A plane mirror produces a virtual and erect image. The distance of the image from the mirror is same as distance of object from the mirror. The image formed is of the same size as of the object. The image is produced behind the mirror.
In the given diagram, the image of the ball would form behind the mirror at position X which is at equal distance from mirror as the ball is.
50 POINTS! A Dancer leaps across the stage in a beautiful grand jete. The ballerina leaps at an angle of 25° and is able to jump a horizontal distance of 1.5m. What is her initial x and initial y velocity? (hint: find Vi first, then Vxi and Vyi)
The horizontal range formula tells us
[tex]x=\dfrac{{v_i}^2\sin2\theta}g[/tex]
where [tex]v_i[/tex] is the dancer's initial speed, [tex]\theta[/tex] is her launch angle, and [tex]g[/tex] is the acceleration due to gravity. So
[tex]1.5\,\mathrm m=\dfrac{{v_i}^2\sin50^\circ}{9.8\frac{\rm m}{\mathrm s^2}}\implies v_i=4.4\dfrac{\rm m}{\rm s}[/tex]
Her initial velocity as a vector is
[tex]\vec v_i=v_{xi}\,\vec\imath+v_{yi}\,\vec\jmath[/tex]
where
[tex]v_{xi}=v_i\cos25^\circ=4.0\dfrac{\rm m}{\rm s}[/tex]
[tex]v_{yi}=v_i\sin25^\circ=1.9\dfrac{\rm m}{\rm s}[/tex]
Answer: 1.9m/s.
Explanation: 1.9m/s.