Which two statements are true about a system?A system is a group of objects analyzed as one unit.
Energy that moves across system boundaries is conserved.
There’s only one way to define the boundaries of a system.
All systems are made by humans.
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Statement 1 and 2 are true about the system.
System
A system can be defined as an interdependent group of items forming a unified whole a number system to act according to the set of rules.
Statement 1 is true about the system. A system can be defined as a group of elements that act as a unit that has been chosen for studying the changes that take place within it in response to varying conditions.
Statement 2 is correct which states the law of conservation of energy. According to the law of conservation of energy, the energy within a system is conserved, it only changes its form.
Statement 3 is not true. The system can be defined in many ways that are totally dependent on the nature of the system.
Statement 4 is incorrect. Systems can be made by humans, but not all systems. A system can be theoretical or practical.
Hence we can conclude that statements 1 and 2 are correct.
To know more about the system, follow the link given below.
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Answer:
The specific heat capacity of the substance = 455.38 J/kgK
Explanation:
Heat lost by the substance = Heat gained by water + heat gained by the aluminum calorimeter
Qs = Qw + Qc.................... equation 1
Where Qs = heat lost by the substance, Qw = heat gain by water, Qc = heat gain by the aluminum calorimeter.
Qs = c₁m₁(T₁-T₃)................ equation 2
Qw = c₂m₂(T₃-T₂)............. equation 3
Qc = c₃m₃(T₃-T₂)............. equation 4
Where c₁ = specific heat capacity of the substance, m₁ = mass of the substance, c₂ = specific heat capacity of water, m₂ = mass of water, c₃ = specific heat capacity of aluminium, m₃ = mass of the aluminum container, T₁ = Initial Temperature of the substance, T₂ = initial temperature of water, T₃ = Final equilibrium temperature.
Substituting equation 2, 3, 4 into equation 1
c₁m₁(T₁-T₃) = c₂m₂(T₃-T₂) + c₃m₃(T₃-T₂)................. equation 5
Making c₁ the subject of equation 5
c₁ = {c₂m₂(T₃-T₂) + c₃m₃(T₃-T₂)}/m₁(T₁-T₃)............... equation 6
Where c₂ = 4200 J/kgK, m₂ = 0.285 kg, m₁ = 0.125 kg, c₃ = 900 J/kgK, m₃= 0.150 kg, T₁ = 90.5°C, T₂ = 29.5°C, T₃ = 32.0°C
Substituting these values into Equation 6,
c₁ = {4200×0.285(32-29.5) + 900×0.150(32-29.5)}/0.125(90.5-32)
c₁ = {1197(2.5) + 135(2.5)}/7.3125
c₁ = {2992.5 + 337.5}/7.3125
c₁ = 3330/7.3125
c₁ = 455.38 J/kgK.
Therefore the specific heat capacity of the substance = 455.38 J/kgK
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Answer:
The answer is Groundwater
Explanation:
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The required force between the two charges is approximately 3371.25 N.
What is Coulomb's law?
The force between two point charges can be calculated using Coulomb's law, which states that:
F = k * (q₁ * q₂) / r²
where F is the force between the charges, k is the Coulomb constant, q₁ and q₂ are the magnitudes of the charges, and r is the distance between them.
In this case, we are given that one charge has a magnitude of 0.006 C and the other has a magnitude of 0.001 C, and they are separated by a distance of 4 meters. So we can substitute these values into Coulomb's law to find the force:
F = (8.99 x 10⁹ ) * [(0.006 ) * (0.001 )] / (4 )²
F = 3371.25 N
Therefore, the force between the two charges is approximately 3371.25 N.
Learn more about forces between charges here:
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B) The particles have sufficient energy to become an ionized gas and are in the most common state of matter in the universe.
C) The particles are not able to move out of their positions relative to one another, but do have small vibrational movements.
D) The particles are not bound to one another, move quickly, have a low density, and are able to spread apart from one another if unconstrained.
Brad and Matt are working in the lab. They noticed that when they mixed two dilute solutions together, the reaction between them happened very slowly. Which of Matt's suggestions would BEST help to increase the rate of this reaction?
A) increase the concentration of both solutions
B) decrease the concentration of both solutions
C) increase the concentration of one of the solutions
D) decrease the concentration of one of the solutions
Identify the correct order of increasing intermolecular force of attraction for the three most common states of matter.
A) liquid → solid → gas
B) solid → liquid → gas
C) gas → liquid → solid
D) gas → solid → liquid
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C) The particles are not able to move out of their positions relative to one another, but do have small vibrational movements.
In solids, in fact, particles are bound together so they cannot move freely. However, they can move around their fixed position with small vibrational movements, whose intensity depends on the temperature of the substance (the higher the temperature, the more intense the vibrations). For this reason, we say that matter moves also in solid state.
2) The correct answer is
A) increase the concentration of both solutions
In fact, when we increase the concentration of both solutions, we increase the number of particles that react in both solutions; as a result, the speed of the reaction will increase.
3) The correct answer is
C) gas → liquid → solid
In gases, in fact, particles are basically free to move, so the intermolecular forces of attraction are almost negligible. In liquids, particles are still able to move, however the intermolecular forces of attraction are stronger than in gases. Finally, in solids, particles are bound together, so they are not free to move and the intermolecular forces of attraction are very strong.