The dissolution of LiCl in water and the temperature rise from 18.2°C to 22.9°C suggests an exothermic dissolution process in thermochemistry, related to high school chemistry.
Explanation:The question deals with the dissolution of Lithium Chloride (LiCl) in water and the resulting temperature change, which is a concept in thermochemistry. When a solute dissolves in a solvent, it can either absorb heat from the water, resulting in a temperature decrease (endothermic) or release heat to the water, causing the temperature to increase (exothermic). The observed temperature increase from 18.2°C to 22.9°C in this scenario indicates that the dissolution of LiCl in water is an exothermic process. To calculate the heat involved in the process, one would need to know the specific heat capacity of the solution, which is often assumed to be similar to that of pure water (4.18 J/g°C) if the solution is not very concentrated.
Research for rube goldberg Project
Momentum
and
Speed
help please thank you :)
Final answer:
Understanding momentum and speed is crucial for designing Rube Goldberg projects, which are complex devices executing simple tasks. Momentum involves the mass and velocity of an object, while speed measures how fast an object moves.
Explanation:
The question involves concepts of momentum and speed, crucial in understanding the dynamics of a Rube Goldberg project. Rube Goldberg machines are intricate, often complicated devices that perform a simple task in a roundabout way, usually involving a series of chain reactions. Understanding momentum and speed is essential for designing these machines effectively.
Momentum is a measure of an object's motion, calculated as the product of an object's mass and its velocity. It's a vector quantity, which means it has both magnitude and direction. A fascinating example of momentum in action is the experiment where a ping-pong ball and a baseball are stacked and dropped, demonstrating how momentum transfer can cause the ping-pong ball to shoot upwards at high speed after the baseball bounces.
Speed, on the other hand, is the rate at which an object moves along a path. It's a scalar quantity, indicating it has only magnitude without direction. In Rube Goldberg projects, varying the speed of objects can influence the timing and sequence of events, making an understanding of this concept crucial for the timing aspects of your machine.
To incorporate these principles into a Rube Goldberg project, consider designing a segment where the transfer of momentum between objects is visible, like a series of dominos falling. Also, manipulating the speed of different segments can add an element of surprise or ensure the sequential activation of different parts of your machine.
Gas in a balloon occupies 3.3 L. What volume will it occupy if the pressure is changed from 100.0 kPa to 90.0 kPa (at constant temperature).
Boyle's law says "the pressure of a fixed
amount of an ideal gas is inversely proportional to its volume when the
temperature is constant".
P α
1/V
Where P is pressure of the gas and V is the volume
of the gas.
Hence, we can use Boyle's law for two different
situations as,
P₁V₁ = P₂V₂
P₁ =
100.0 kPa = 1 x 10⁵ Pa
V₁ =
3.3 L
P₂ =
90 x 10³ Pa
V₂ =?
By substitution,
1 x 10⁵ Pa x 3.3 L = 90 x 10³ Pa x V₂
V₂ = 3.7 L
Hence, if the pressure drops from 100 kPa to 90
kPa, then the volume of the gas will be 3.7 L.
Here, we made an assumption as the gas is an ideal gas.
Final answer:
To determine the new volume of the gas when the pressure changes, we apply Boyle's Law, which leads to a calculation showing that when the pressure decreases from 100.0 kPa to 90.0 kPa, the volume will increase from 3.3 L to 4.07 L at constant temperature.
Explanation:
The student's question pertains to the behavior of a gas inside a balloon when the pressure exerted on it changes at constant temperature. To solve this problem, we can use Boyle's Law, which states that for a given mass of an ideal gas at constant temperature, the pressure and volume of the gas are inversely proportional. Mathematically, this can be written as P1V1 = P2V2.
Given the initial conditions, the pressure P1 is 100.0 kPa and the initial volume V1 is 3.3 L. The final pressure P2 is 90.0 kPa. We want to find the new volume V2. By rearranging the formula to solve for V2, we get V2 = (P1V1)/P2.
Substituting the values we have: V2 = (100.0 kPa * 3.3 L) / 90.0 kPa = 366.7 L/kPa / 90.0 kPa = 4.07 L.
Therefore, when the pressure is decreased to 90.0 kPa, the balloon will occupy a volume of 4.07 L.
please please help with this chemistry questions!!!
Answer:
7. 40°C
8. 6.67°C
Explanation:
7. 20*2=40°C
8. The balloon has reduced in size by 3 times. So, the collision ant the temperature must be 3 times less. So =20/3= 6.67°C
what features of earth's crust do convergent divergent and transform boundaries form
Tectonic plate movements at convergent, divergent, and transform boundaries form various features: divergent boundaries create mid-ocean ridges, convergent boundaries result in subduction zones and mountain ranges, while transform boundaries lead to faults and earthquakes.
Earth'al-slipping earthquakes and offset rivers.s crust is dynamic, with tectonic plate movements giving rise to various geological features at convergent, divergent, and transform boundaries. At divergent boundaries, such as mid-ocean ridges, plates move apart and new crust is formed via upwelling magma that cools to become lithospheric rock. In contrast, convergent boundaries are locations where plates are moving toward each other, leading to subduction zones, trenches, mountain ranges, and volcanic activity. The transform fault boundaries are characterized by lateral movement of plates creating faults and leading to frequent earthquakes.
Divergent boundaries most commonly create mid-ocean ridges and new oceanic crust, with ridge push playing a role in plate motions. Convergent boundaries can form deep ocean trenches, mountain ranges, volcanic arcs, and earthquake zones, typified by the destruction of crust as one plate subducts under another. For transform boundaries, crust is neither created nor destroyed but can result in distinctive offset geological features, such as through later
Which statement best explains why the sun and the moon appear to be about the same size in the sky?
A). The Sun and moon have the same diameter
B). The Moon is smaller in diameter and is closer to the earth than the sun.
C). The moon is larger in diameter and farther than th earth THAN the sun
Which statement best compares Mercury and Earth?
A.Mercury has very little atmosphere, but Earth has an atmosphere consisting of oxygen.
B.Mercury is very cold, but Earth has moderate temperature to sustain life.
C.They both have liquid water and carbon dioxide in their atmosphere.
D.They both have one moon.
Answer:
A. Mercury has very little atmosphere, but Earth has an atmosphere consisting of oxygen.
Explanation:
Mercury does not have any moon while the Earth has one. Mercury does not have liquid water while 70% of the Earth is covered with water. Mercury has extreme variations of temperature due its close proximity to the Sun. The dark side has extremely low temperature while the lit has has extremely high temperature. The Earth has moderate temperature of about 14 degrees which sustains life.
Mercury has extremely weak atmosphere; probably its has captured some solar wind particles. It comprises of helium, hydrogen, calcium, oxygen etc. Earth has thick atmosphere primarily composed of Nitrogen and Oxygen.
An aqueous solution of sodium hydroxide reacts completely with a solution of hydrochloric acid. After all the water evaporates from the reaction mixture, what will remain
This is acid-base reaction:
NaOH (aq) + HCl (aq) = H2O (l) + NaCl (aq)
After the water evaporated from reaction, NaCl (salt) remains.
In a reaction involving sodium hydroxide and hydrochloric acid, sodium chloride will remain after evaporation of all the water from the reaction mixture.
What is a neutralization reaction?It is a reaction involving acids and bases to form salt and water.
The reaction involving sodium hydroxide and hydrochloric acid is shown in the equation below:
[tex]NaOH + HCl -- > NaCl +[/tex] [tex]H_2O[/tex]
Sodium chloride and water is formed and once all the water is evaporated off from the mixture, the sodium chloride is left.
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there are 125 lima beans 56 garbanzo beans 39 kidney beans and 144 green peas in a container. find the percent by number of green peas in the container, explain why.
The total count of the beans and peas in the container is 364 and green peas are 144 out of these. The percentage of green peas in the container is (144/364) * 100 = 39.56%.
Explanation:To calculate the percentage of green peas amongst all the beans and peas in the container, we firstly need to total all the different type of beans and peas, and then calculate what percent of that total is made up of green peas.
Firstly, calculate the total count: 125 lima beans + 56 garbanzo beans + 39 kidney beans + 144 green peas = 364 items in total.
Next, use the formula for calculating percentages: (part/total) * 100. In this case, the 'part' is the number of green peas (144) and the 'total' is the total number of items (364). So the calculation will be: (144/364) * 100 = 39.56%. Hence, the green peas make up approximately 39.56% of the total count of beans and peas in the container.
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which subatomic particles would be found orbiting around the nucleus?
The electron.
Hope this helped! :)
what are two characteristics of acids
Both the brain and the spinal cord are protected by _____.
A.a thick, paste-like substance
B.the skull
C.a watery fluid
D.the vertebral column
ASAP
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Increasing the total pressure above a liquid raises the boiling point. Which of the following best explains why?
The number of molecules with high kinetic energies is increased.
The amount of kinetic energy required for the molecules to break free of the intermolecular forces in the liquid is raised.
The number of molecules with high kinetic energies is reduced.
Please explain your answer.
Answer:
he never got his brainliest...
Explanation:
What might have caused this canyon to form?
A) winds blowing in zig-zag way
B) frequent earthquakes in the area
C) water breaking the rocks into pieces
D) heavy rainfall flooding the part of the land
In an ecosystem, canyons are formed by water breaking the rocks into pieces.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different ecosystems present in the environment.
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Why is it better to give the actual speed of an object rather than to simply say it moved fast or it moved slowly
determine the morality of the solution containing 2.4 m o l of KL in 140 ml total volume of solution
When heat flows into a system its value is _ when heat flows out of a system its value is negative
Heat is the amount of energy transferred from and to the object or the substance of the system. When heat flows into a system its value is positive.
What are free energy changes and enthalpy?Change in the free energy of the system is shown as [tex]\rm (\Delta G)[/tex] it tells about the reversible work performed by the system in thermodynamically constant pressure and temperature.
The enthalpy is equal to the heat formation and is shown as [tex]\rm (\Delta H)[/tex]. It represents the total heat content of the reaction and enthalpy change of the final and the initial system.
Q or the heat when flows in the system for the reaction is a positive value as the energy of the system gets increased while when the heat is released from the reaction then the value is negative as the energy decreases.
Therefore, heat transfer to the system is positive.
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The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change
Answer:
The gas pressure decreases by half its initial value.
Explanation:
From Boyle's law, the reationshipp between volume and pressure at constnat temperature is an inverse one. This proves that as the volume of a gas increases, its pressure decreases respectively. So, the answer to the question is that the gas pressure would decrease accordingly.
When a spacecraft travels away from Earth, the gravitational force acting on it (2 points)
decreases first and then increases
increases first and then decreases
increases
decreases
Answer:
The gravitational force acting on it decreases.
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Atomic radius generally increases as we move
down a group and from right to left across a period
up a group and from left to right across a period
up a group and from right to left across a period
Please explain your answer.
The atomic radius generally increases as we move down a group and from left to right across a period, due to an increase in energy levels and nuclear charge.
Explanation:The atomic radius generally increases as we move down a group and from left to right across a period.
As we move down a group, the number of energy levels increases, resulting in larger atomic radii. This is because each subsequent energy level is farther from the nucleus.
As we move from left to right across a period, the atomic radius generally decreases. This is because the increasing nuclear charge attracts the electrons more strongly, causing the atomic size to decrease.
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I have a question. Say my two dogs mated but they were of different breeds. The male was a poodle and the female was a terrier. What are the chances the pup will grow to be as tall as a poodle or as small as a terrier
Final answer:
When a poodle and a terrier mate, the size of their puppies can vary, and traits such as size are influenced by multiple genes from both breeds.
Explanation:
The specifics of how traits such as size are inherited in dogs can be quite complex because they are influenced by multiple genes, and these genes can have different modes of inheritance. When a poodle mates with a terrier, the offspring, which is a mixed breed or a crossbreed like the known cockapoo, will inherit a combination of traits from both parents. The size of the puppies can vary and may be somewhere in between the sizes of the parent breeds. To predict the exact size of the puppies, one would need information on the specific genes that determine size in both the poodle and the terrier, and how they interact when combined. While domestic dogs display a wide range of physical characteristics, most dogs of different breeds are capable of interbreeding and producing viable offspring.
EXPLAIN WHAT CHEMILUMINESCENCE IS AND HOW IT WORKS USING THE CROSS CUTTING CONCEPT OF CAUSE AND EFFECT
PLZ I NEED THIS ASAP
A reaction rate is measure per unit of?
what is the answer to this equation x - 5 = 12
Which statement is correct about the total mass of glucose and oxygen formed during photosynthesis?
A. It is equal to the total mass of carbon dioxide used.
B. It is less than the total mass of carbon dioxide used.
C. It is equal to the total mass of carbon dioxide and water used.
D.It is greater than the total mass of carbon dioxide and water used.
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In a calorimeter, 1.0 kg of ice melts at 0 degrees Celisius. The enthalpy of fusion of the ice is 334 J per g. How much heat was absorbed?
33.4 kJ
33.4 J
Please explain your answer.
Exactly what the other guy said except its in kJ on k12. So 0.33 kJ
(about the use of coal) Can you think of any problems that could come from using only 15 years of data to predict trends for the next 100 years? Explain your answer. How could you prevent some of these problems?
Answer:
Yea the girl above me is correct
Explanation:
The chart shows the solubility of different substances.
Which statement is represented by the graph?
Temperature can change the solubility of a solute.
Temperature has no affect on the solubility of a solute.
Salt has a greater solubility than sugar.
Nitrite salt has a greater solubility than sugar.
The temperature can change the solubility of a solute. Option A is correct.
For many solids that are soluble in liquid water, solubility increases as the temperature increases. The higher the temperature, the more kinetic energy the solvent molecules have available to break down the intermolecular bonds that hold the solute molecules together.
The solubility depends on the solution's temperature. For example, salt solubility increases with increasing temperature whereas calcium sulfate solubility decreases with increasing temperature.
At high temperatures, solubility is high, so the solution dissolves more solute. When the solution cools, solubility decreases, causing the solute to separate out as a solid.
Therefore the correct answer is option A.
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The question is incomplete. The most probable question is given below:
The chart shows the solubility of different substances.
A 3-column table with 6 rows. The first column labeled solute has entries sugar, sugar, salt, salt, nitrite salt, and nitrite salt. The second column labeled temperature has entries 20 degrees C, 100 degrees C, 20 degrees C, 100 degrees C, 20 degrees C, and 100 degrees C. The third column labeled grams per 100 grams of water has entries 204, 487, 36, 39, 81, 160.
Which statement is represented by the graph?
A.) Temperature can change the solubility of a solute.
B.) Temperature has no effect on the solubility of a solute.
C.) Salt has a greater solubility than sugar.
D.) Nitrite salt has a greater solubility than sugar.
If you have a density of 3g/ml and volume of 10mL.what is the mass?
Answer:
Mass, m = 30 grams
Explanation:
It is given that,
Density of an object, [tex]d=3\ g/ml[/tex]
Volume occupies by the silver, [tex]V=10\ ml[/tex]
We need to find the mass of a piece of silver. The mathematical formula for the density is given by :
[tex]d=\dfrac{m}{V}[/tex]
[tex]m=d\times V[/tex]
[tex]m=3\ g/ml\times 10\ ml[/tex]
m = 30 grams
So, the mass of the piece of the silver is 30 grams. Hence, this is the required solution.
The density of a Material
The density of a material is defined as the mass per unit volume
it formula is given as
Density = Mass/Volume
and the unit is g/cm^3
Explanation:
Given data
Mass = ???
Volume = 10mL
Density = 3g/ml
Hence the mass is expressed as
Mass= density /Volume
Mass= 3/10
Mass= 0.3g
Therefore the Mass is 0.3g
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In which of these situations would light slow down?
a. from glass to air
b. from ice to water
c. from plastic to air
d. from air to water
Light would slow down when it goes from glass to air and from air to water due to the higher refractive indices of these media.
Explanation:When light travels from one medium to another, it can undergo a change in speed and direction. The change in speed and direction is caused by the change in the refractive index of the medium. The refractive index is a measure of how much the speed of light in a medium decreases compared to its speed in a vacuum.
In the given situations, light would slow down when it goes from glass to air and from air to water. Glass and water have higher refractive indices compared to air, which causes light to slow down when it enters these media.
Subtract 5.01x10^7-30x10^-9
35 is the answer
hope im right