when 2.5g of licl is dissolved in 112g of water the temperature of the water increases from 18.2 to 22.9
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.
Where do you see physical and chemical weathering on a daily basis?
If you look carefully at the world, you will notice that there are many examples of physical and chemical weathering all around us.
Physical weathering occurs when rocks are broken apart without them changing their chemical composition. An example would be how, during the winter, ice can grow in cracks of rocks, weakening and eventually breaking them apart.
On the other hand, chemical weathering refers to rain water reacting with the mineral grains in rocks in order to form new minerals. An example of this would be how metal objects sometimes rust if they are left in the rain constantly.
What physical property is changed when a waitress pours coffee from a pot into four mugs?
temperature
density
volume
color
An airplane is flying at 635 km per hour at an altitude of 35,000 m. What is its velocity?
The velocity of the airplane flying at 635 km/hour at an altitude of 35,000m is 635km/hr.
Velocity is a vector quantity that denotes the rate of change of position with respect to time, combining speed with a directional component.
According to this question, an airplane is flying at 635 km per hour at an altitude of 35,000m. The velocity of the airplane is already in the question and it is 635km/hr.
The velocity of a moving object is measured in metres/seconds, kilometer/hour etc.
1. How do you find the mechanical advantage of a compound machine?
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Write a definition for each of these terms on the lines below
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2. pulley
3. wheel and axle
(A)What type of cloud forms at high altitudes and is wispy and feathery.
A. Stratus
B. Altocumulus
C. Cumulus
D. Cirrus
(B) Why do clouds usually form high in the air instead of near the earths surface?
(C) What is the definition of precipitation
Answer:
Answer A)
Circus clouds are the highest of all clouds and made of ice crystal.
Circus clouds have no visible precipitation.
Answer B)
Because when the warm, moist air rises up and gets cool, water vapor condenses on tiny particles to form liquid water or ice crystal and form cloud.
Answer C)
Precipitation is a fall of moisture from the atmosphere in any form. it is an important input to hydrology.
Floods and droughts are directly related to precipitation.
What is the most strongest metal on earth?
Answer: tungsten
Explanation:
In terms of tensile strength, tungsten is the strongest out of any natural metal (142,000 psi). But in terms of impact strength, tungsten is weak — it's a brittle metal that's known to shatter on impact. Titanium, on the other hand, has a tensile strength of 63,000 psi.
Sodium bicarbonate is the chemical name for baking powder. Its chemical formula is NaHCO3. What does the subscript 3 mean?
There are three molecules of sodium bicarbonate.
There are three molecules of oxygen in sodium bicarbonate.
There are three atoms of oxygen in sodium bicarbonate.
There are three atoms of sodium bicarbonate.
Answer:
c
Explanation:
what does it mean when the h3o+ to x- distance doesn't change much as the first 4 to 5 water molecules are added
The addition of the water molecules to the hydronium and the halogen groups is modeled by dissociation. The distance does not change because halogen ion is a stronger base than water.
What are a strong base and weak acid?Strong bases are the solution that gets completely dissociated in the aqueous solution and results in the release of hydroxide ions.
Weak acids are acids that do not get dissociated completely into ions in an aqueous solution.
When water molecules are added to the solution the distance [tex]\rm H_{3}O^{+}[/tex] to [tex]\rm X^{-}[/tex] does not change as [tex]\rm X^{-}[/tex] is a strong base than the water and [tex]\rm HX[/tex] is weak acid than the hydronium ion.
Therefore, the distance does not change.
Learn more about acids and bases here:
https://brainly.com/question/23214585
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what is the balance equation for HgO(s)- Hg(l)+O2(g)
What does the second law of thermodynamics say about entrophy
Final answer:
The second law of thermodynamics states that entropy either increases or remains constant in any spontaneous process. Heat transfers energy from higher to lower temperature objects, not the other way around.
Explanation:
The second law of thermodynamics states that the total entropy of a system either increases or remains constant in any spontaneous process; it never decreases. An important implication of this law is that heat transfers energy spontaneously from higher- to lower-temperature objects, but never spontaneously in the reverse direction. This is because entropy increases for heat transfer of energy from hot to cold. The decrease in entropy of the hot object is therefore less than the increase in entropy of the cold object, producing an overall increase in entropy for the system.
what instrument us normally used to measure atmospheric pressure
when water is in the gas state it is known as ________
Rita divides Avogadro’s number (approximately 6.02214 mc002-1.jpg 1023) by 2.055 to calculate the number of atoms in a sample. Which expression gives her result to the correct number of significant figures?
Answer:
2.930 x 10^23 is the correct answer
19 pts - How do you determine if something is isoelectronic?
Which of the following is isoelectronic-
O2, F-, Ne, Na
Se2-, Br-, Kr, Rb+
I-, Xe, Cs, Ba2+
Wildfires are _______.
a.
a human source of air pollution
b.
a natural source of air pollution
c.
both a natural and human source of air pollution
d.
none of the above
Answer:
c. both a natural and human source of air pollution
Explanation:
Wildfires can be produced both by humans (on purpose or not), and naturally (for example when a light strikes a tree).
The smoke produced (despite the origin of the wildfire) pollutes the surrounding air.
Coal is used in the making of _____. Select all that apply.
Plastics
Medicine
Clothing
Paper
Food
Answer:
Plastics, Medicine, Clothing, Paper
Explanation:
everything but food
heated blocks of iron used to be warm bed. A 1600g brick of iron heated to 155c would release how many joules of heat energy as it cooled to 25c?
Final answer:
The 1600 g iron brick would release 93,568 joules of heat energy as it cools from 155°C to 25°C.
Explanation:
The heat energy released by a 1600 g brick of iron as it cools from 155°C to 25°C can be calculated using the specific heat capacity of iron and the formula Q = mcΔT, where Q is the heat energy in joules, m is the mass in grams, c is the specific heat capacity in J/g°C (for iron, c = 0.449 J/g°C), and ΔT is the change in temperature.
To find out how much heat energy is released, we calculate:
Mass (m) = 1600 g
Change in temperature (ΔT) = 155°C - 25°C = 130°C
Specific heat capacity (c) = 0.449 J/g°C
Substitute these values into the formula:
Q = 1600 g × 0.449 J/g°C × 130°C
Q = 93568 J
Therefore, the 1600 g brick of iron would release 93,568 joules of heat energy as it cools to 25°C.
Why does decreasing the temperature of orange juice increase its pH level? Is it something to do with the chemical equilibrium?
Decreasing the temperature of orange juice increases its pH level because the solubility of carbon dioxide (CO2) in the juice decreases, leading to less carbonic acid formation and therefore a higher pH, meaning the juice becomes less acidic.
The pH of a solution is a measure of its acidity or basicity. In the case of orange juice, the main source of its acidity is the various organic acids present, such as citric acid. However, carbon dioxide (CO2) dissolved in the juice also contributes to its acidity through the formation of carbonic acid (H2CO3). Temperature plays a role in the solubility of gases in liquids; as temperature decreases, the solubility of gases increases. Conversely, when the temperature is increased, the solubility of gases like CO2 decreases, which means less CO2 is dissolved in the juice, leading to less carbonic acid formation, and thus a reduction in the overall acidity level. The pH level, therefore, increases with a decrease in temperature.
please help due tomorrow
5). describe what are the roles of producers consumers and decomposers in a ecosystem
Trejo reacts 5.0 moles of hydrochloric acid (HCI) with 1.5 moles of barium hydroxide (Ba(OH)2). Which reagent is the limiting reagent and which is in excess?
1. Compare and Contrast microwaves with visible light using wavelength, frequency and energy. (3pts-1pt each for wavelength, frequency and energy)
In the alkane series of hydrocarbons, as the number of carbon atoms decreases, the normal boiling point ofthe compounds
when 6 grams of zinc are dropped into excess hydrochloric acid, how many grams of zinc chloride will be produced?
Answer: The mass of zinc chloride produced will be 12.402 grams.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
For zinc:Given mass of zinc = 6 g
Molar mass of zinc = 65.38 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of zinc}=\frac{6g}{65.38g/mol}=0.091mol[/tex]
For the reaction of zinc and hydrochloric acid, the chemical equation follows:
[tex]Zn(s)+2HCl(aq.)\rightarrow ZnCl_2(s)+H_2(g)[/tex]
Hydrochloric acid is given in excess, so it is considered as an excess reagent. Zinc is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
1 mole of zinc metal produces 1 mole of zinc chloride.
So, 0.091 moles of zinc metal will produce = [tex]\frac{1}{1}\times 0.091=0.091moles[/tex] of zinc chloride.
Now, calculating the mass of zinc chloride produced, we use equation 1.
Moles of zinc chloride = 0.091 moles
Molar mass of zinc chloride = 136.286 g/mol
Putting values in equation 1, we get:
[tex]0.091=\frac{\text{Mass of zinc chloride}}{136.286g/mol}\\\\\text{Mass of zinc chloride}=12.402g[/tex]
Hence, the mass of zinc chloride produced will be 12.402 grams.
Which of the following units would be the most appropriate for measuring the thickness of a piece of paper? A. centimeters B. millimeters C. kilometers D. meters
what is 350 kelvins on the celsius scale of temperature
How do you find the advantage of wheels and axles?
which aqueous solution of Kl freezes at the lowest temperature?
a) 2 mol of Kl in 1,000. g of water
b) 1 mol of Kl in 1,000. g of water
c) 2 mol of Kl in 500. g of water
d) 1 mol of Kl in 500. g of water
Answer:
c) 2 mol of Kl in 500. g of water
Explanation:
Colligative properties such as melting and boiling points and osmotic pressure all depend on the amount of solute present. The more the concentration of solute present, the greater the degree of display of colligative properties by a solution
Considering the options given, 2 mol of Kl in 500. g of water has the highest concentration and is expected to freeze at the lowest temperature.
A thickness of a material is a factor that affects heat conductivity. Does heat flow faster through a thick or a thin piece of the same material?
The surface area of a material is a factor that affects heat conductivity. Does heat flow faster through a large surface area or through a small surface area? Why? (Hint: Think about the number of particles available to bump into one another).
Change in temperature is a factor that affects heat conductivity. Will heat flow faster when there’s a large change in temperature or a small change in temperature?
Answer:
1. Heat flows faster through a thin material.
2. Heat flows through a large surface area.
3. Heat flows faster for a large change in temperature.
Explanation:
Thinking process:
Newton's law of cooling or heat transfer is given by the following equation:
[tex]Q= kA\delta T[/tex]
Where Q = Heat change (J)
A = area of hear transfer (m²)
[tex]\fdelta[/tex][tex]\delta T[/tex] = Change in temperature.
However, for a temperature difference across the wall having a thickness "x"and a constant surface area A, we get,
[tex]Q= k.A\frac{T_{1} - T_{2} }{x}[/tex]
Where x = thickness of the material
As we can see, increasing the thickness, x, decreases the heat flux
Increasing the area, A increases the heat flux
A big temperature increase, ΔT results in a large heat transfer.
Final answer:
Heat transfers more quickly through a thin material and with a larger contact surface area. Moreover, a greater temperature difference accelerates the rate of heat flow.
Explanation:
Heat conductivity is greatly influenced by three key factors:
Thickness of the material: Heat transfers more slowly through a thick material than through a thin one, because a thicker material requires more time for the heat to be conducted across by the series of molecular collisions. This is comparable to wearing thick clothing in winter for better insulation.Surface area: A larger surface area allows for more molecular collisions, therefore enhancing the rate of heat conduction. A greater contact area facilitates more efficient heat transfer through conduction.Temperature difference: The rate of heat flow increases with a larger temperature difference (T₂ - T₁) between two sides of the material. Greater difference in temperature drives a faster rate of molecular collisions and therefore a higher rate of heat transfer.In summary, the rate of heat transfer through a material is directly proportional to the temperature difference and surface area, while inversely proportional to the material's thickness.
what does the vsepr theory stand for
Answer:
why molecules have different shapes lol
Explanation: