When a powder is dissolved in water, it changes the temperature because the chemical reaction that occurs between the particles of the solute and the solvent when they mix. The heat energy that is released or absorbed when two particles come together is known as enthalpy of solution.
In order to understand the temperature change in detail, we need to look at the two types of enthalpies that are involved when a powder is dissolved in water.
The first type is called the lattice enthalpy which is the energy that is needed to break the bonds between the particles in the solid. The second type is the hydration enthalpy which is the energy that is released when the particles of the solute are surrounded by the solvent particles.
When a powder is dissolved in water, the lattice enthalpy is broken and the particles of the solute are dispersed throughout the solvent. This requires energy, so the temperature of the solution decreases. Then the solvent particles surround the particles of the solute and release energy, so the temperature of the solution increases. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy.
When a powder is dissolved in water, it changes the temperature because of the chemical reaction that occurs between the particles of the solute and the solvent when they mix. When two particles come together, the heat energy that is released or absorbed is known as enthalpy of solution. There are two types of enthalpies involved when a powder is dissolved in water.
The first type is lattice enthalpy, which is the energy that is needed to break the bonds between the particles in the solid. The second type is hydration enthalpy, which is the energy that is released when the particles of the solute are surrounded by the solvent particles.
When a powder is dissolved in water, the lattice enthalpy is broken, and the particles of the solute are dispersed throughout the solvent. This requires energy, so the temperature of the solution decreases. Then, the solvent particles surround the particles of the solute and release energy, so the temperature of the solution increases. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy.
If the lattice enthalpy is higher than the hydration enthalpy, the solution will be cold because more energy is required to break the bonds in the solid than is released when the particles are surrounded by solvent particles. Conversely, if the hydration enthalpy is higher than the lattice enthalpy, the solution will be hot because more energy is released when the particles are surrounded by solvent particles than is required to break the bonds in the solid.
When a powder is dissolved in water, the temperature of the solution changes because of the chemical reaction between the particles of the solute and the solvent when they mix. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy. If the lattice enthalpy is higher than the hydration enthalpy, the solution will be cold, and if the hydration enthalpy is higher than the lattice enthalpy, the solution will be hot.
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other than exercises, what other factors do you think influences breathe/minute?
why?
Answer:
I think probably diet because the type of food you put in your body (if it has high calorie or sodium) can severley affect your overall health and therefore affect your bpm(beats per minute)
Explanation:
Answer:
Running is the factor that I think influences breathe/minute
A student is studying asbestos, a mineral that causes cancer in humans. One of the components of asbestos is silicon, a somewhat reactive element, that is the second most abundant element found in the Earth’s crust. Which characteristic of silicon is most closely related to its chemical reactivity?
The atomic mass of silicon, which is 28.085 amu
The density of silicon, which is 2.33 g/cm3
The 4 valence electrons in each atom of silicon
The 14 protons in each atom of silico
Answer:
The destiny of silicon,which is 2.33 g/cm3
Explanation:
Suppose you have 3 blocks of oak wood as shown below.
Which of the following statements is true for these three blocks of wood? *
500 g_____________300 g___________200 g
A. Their masses and volume are the same
B. Their densities are different
C. The smallest block will float on water and the others will sink in water
D. Their masses and volumes are different, but their properties are the same
Answer:
c
Explanation:
1. It is a combination of two or more substances in which each pure substance retains its
individual chemical properties.
A. Malter
B. Substance
C. Mixture
D Element
Answer:
It is a combination of two or more substances in which each pure substance retains its
individual chemical properties.
C. Mixture
PLEASE HELP ASAP Do NOT give me a random gibberish answer or else I might report you!!
If you were camping in a rainforest for two days, your presence would cause many changes to the surroundings. Describe two physical and two chemical changes that could occur as a result of your experience.
So, all I need you to do is to give me two physical and two chemical changes that could occur while camping in the rainforest.
Answer:
Physical Changes:
Let's say during your camping trip you stepped on a twig. This would be a physical change.
Let's also say that while there, you accidentally stepped on a flower, causing it to fall off of it's stem. This would also be a physical change.
Chemical Changes:
Let's say you start a fire using wood that you got from this rainforest. Since the act of burning something is a chemical change, this would apply.
Let's also say you forget a banana peel there. After a while, it would start to rot. And since rotting is a chemical change, this would apply as well.
Explanation:
Hope this helps!
(ILL GIVE BRAINLIEST) properties of combining substances change to a form a _____
A: mixture
B: compound
C: element
D: substance
Answer:
compound
Explanation:
When sugar is added to a glass of water, it dissolves. How do you know this?
Answer:
Use a spoon, scoop up a small amount of the syrup. When you do, you won't be able to see any sugar crystals in the liquid which is water.
Fill in the nuclear equation:
I don’t understand how to do it when there’s two elements on both sides.
Answer:
¹₀P
Explanation:
Nuclear reaction:
⁹₄Be + ⁴₂He → ¹²₆C + ?
To balance this equation, as with other combining specie, the mass number on both sides of the expression must be the same. Also, the atomic number must be the same.
Let us represent the unknown by X;
⁹₄Be + ⁴₂He → ¹²₆C + ᵇₐX
Now;
Sum of mass number;
9 + 4 = 12 + b
13 = 12 + b
b = 1
Sum of atomic number;
4 + 2 = 6 + a
a = 0
So the specie is a position ¹₀P
Can anyone Help me please? Im very confused.
Is the following nuclear equation balanced?
no
yes
A 0.150 g metallic block measures 25.0 mm in length, 43.0 mm in width, and 19.0 mm in height. What is the density of the metallic block in g/cm3? a) 7.34 x 10-6 g/cm3 b) 7.34 x 10-3 g/cm3 c) 7.34 g/cm3
The density of the metallic block can be calculated by dividing its mass by its volume. The correct option for the density of the metallic block is c) 7.34 g/cm3.
To calculate the density of the metallic block, we need to use the formula:
Density = Mass / Volume
First, we need to convert the measurements from millimeters to centimeters since density is typically expressed in grams per cubic centimeter (g/cm3).
Length = 25.0 mm = 2.5 cm
Width = 43.0 mm = 4.3 cm
Height = 19.0 mm = 1.9 cm
Next, we calculate the volume of the metallic block:
Volume = Length x Width x Height
Volume = 2.5 cm x 4.3 cm x 1.9 cm = 20.425 cm3
Now, we calculate the density:
Density = Mass / Volume
Density = 0.150 g / 20.425 cm3
Density ≈ 0.00734 g/cm3
Therefore, the density of the metallic block is approximately 0.00734 g/cm3. Converting this to scientific notation, the density is 7.34 x 10-3 g/cm3. Hence, option c) 7.34 g/cm3 is the correct choice.
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What causes ions to form?
a) None of these
b) Atoms/molecules gain or lose a proton
c) Atoms/molecules gain or lose a electron
d) Atoms/molecules gain or lose a neutron
e) Atoms/molecules gain or lose a quark
f) Atoms/molecules gain or lose a nucleus
Answer:
if multiple answer B, C if not C
Explanation:
Answer:
f
Explanation:
i think
An electric current is produced using a bar magnet and a solenoid. Which changes will cause a decrease in the electric current produced? Check all that apply. using more wire loops in the solenoid using fewer wire loops in the solenoid using a stronger magnet moving the solenoid instead of the magnet moving the magnet more slowly
Answer: B and E: Using fewer wire loops in the solenoid , moving the magnet more slowly
Explanation: I just took the test
An electric current is produced using a bar magnet and a solenoid then using fewer wire loops in the solenoid will will cause a decrease in the produced electric current.
Magnetic field of solenoid depends on what?Magnetic field of solenoid depends on the number of coils present in the solenoid and the amount of current flowing from the coil.
If we increases the number of coils present in the solenoid then the electric currect is also increases.Fewer no. of loops on the solenoid decreases the amount of electric currect present in that coil.Using a stronger mangnet near the solenoid also incraeses the strength of the electric currect, as of the induced magnetic field.Moving a solenoid instead of magnet inside the loop, is also increases the electric currect.And moving of magnet near and far away from the solenoid fastly or slowly also increases the electric currect, due to electromagnetic induction.Hence, only fewer wire loops decreases the electric currect.
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Compare and contrast Lamarck's and Darwin's theories of change over time.36a. What are the similarities? What are the differences?B. Why do scientists find Darwin's theory more convincing? 37 2. Explain why earthworms are beige or brown and not green3839a. Using Darwin's theory of natural selection.B. Using Lamarck's theory of change. 3. Explain whether Darwin's theory or Lamarck's theory is a better explanation for your results in the previous activity, "Hiding in the Background." Hint: Be sure to cite evidence from the activity.
Answer:
See explanation
Explanation:
Lanark proposed a theory of evolution hinged on use and disuse of body parts. This is a theory that upholds the transfer of acquired traits to offsprings. Darwin's theory of evolution was rather based on natural selection or 'survival of the fittest'. Darwin's theory has more evidence backing it compared to Lamarck's theory. The field of genetics which appeared long after Darwin's death confirmed that inherited traits are indeed passed from parents to offsprings. These inherited traits are usually those that give organisms an edge over others in their environment.
Earthworms are brown and not green or beige because, the brown earthworms have the same colour as the soil and are better enabled to escape from predators. From Darwin's theory, the brown earthworms are the 'fittest' hence they survive in their environment. Lamarck's theory may approach the matter from the point that earthworms move with their bodies on the soil more frequently, hence they 'acquired' the brown colour and passed it on to their offspring.
From the activity, "Hiding in the Background", individual worms spent their entire life cycle in either green or beige colour. Their colour didn't change as a result of the environment where they lived, rather the green earthworms were more in number, not particularly because of any specific changes the earthworms themselves had undergone, but because most of their predators concentrated on eating the beige worms. As a result of this, there were many green worms when the next generation began compared to the number of beige worms. Hence, there were more green earthworms.
When you take a shower, the "fog" that forms is a result of
a. cooling the air to the condensation temperature.
b. increasing the mixing ratio of the air.
c. increasing the saturation temperature of the air.
d. warming the air to the condensation temperature.
e. decreasing the saturation temperature of the air.
When you take a shower, the "fog" that forms is a result of cooling the air to the condensation temperature. Option (a) "cooling the air to the condensation temperature" accurately explains how the fog is formed when taking a shower.
Here's how it works:
1. When you turn on the shower, the water droplets in the air become aerosolized, which means they turn into tiny particles that float in the air.
2. These water droplets are in a gaseous state because they are heated by the hot water.
3. As the heated water droplets mix with the cooler air in the bathroom, they start to cool down.
4. Cooling the air decreases its ability to hold water vapor, causing the water vapor to condense into tiny droplets that we see as fog.
So, the fog in the shower is formed when the air cools down to the point where it can no longer hold all the water vapor, leading to the condensation of the water vapor into visible droplets. This process is similar to what happens when warm air meets a cold surface, like when you see fog form outside on a cold day.
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what is the smallest star ever found
Answer:
EBLM J0555-57AB
Explanation:
hope this was helpful! :)
Help me please. Which type of plate boundary is responsible for volcanoes and mountain building?
A. convergent
B. divergent
C. transform
Answer:
i should be A i hope this helps
Explanation:
justify the statement atomic size of an element decreases along A period whereas increasing down PLEASE HELP ME
Answer:
Detail is given below.
Explanation:
Atomic radii along period.
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
A weather map indicates that a low-pressure system is approaching a city. Attached to
the low-pressure system is a curved line studded with semicircles. Which forecast
can most likely be predicted about the approaching weather system?
O A warm front is approaching the city, and temperatures will decrease.
O A cold front is approaching the city, and temperatures will increase.
O A cold front is approaching the city, and temperatures will decrease.
O A warm front is approaching the city, and temperatures will increase.
Answer:
The correct option is;
A warm front is approaching the city and temperatures will increase
Explanation:
A low pressure forms by the movement of air away from a particular spot such that the pressure reduces. The movement of air away from a spot occurs when there is a boundary of warm and cold air such that the air moves to maintain a uniform temperature.
Low pressure centers are associated with warm fronts, resulting in the fall of barometric pressure or observed low pressure and are characterized by a rise in temperature.
The greater the objects mass is the greater....(fill in the rest)
Answer: The greater the objects mass is the greater its gravitational force.
Explanation: i got it right:)
Have a blessed day!!!!!
write a detailed set of instructions for making two solutions: (1) 100 ml of 11 mnaoh from solid sodium hydroxide and (2) 1.00 l of 0.1 mnaoh from your first solution. you have in your lab: volumetric flasks marked to contain 100.0 ml and 1.000 l , a graduated cylinder, and a balance.
The solution to making two solutions 100 ml of 11 mNaOH from solid sodium hydroxide and 1.00 l of 0.1 mNaOH from your first solution are as follows:
1. To prepare 100 mL of 11 M NaOH from solid sodium hydroxide, follow the steps:
Step 1: Calculate the mass of NaOH required.
11 M = 11 mol/L, 100 mL of 11 M NaOH
= 11 mmol NaOH (NaOH)
= n (NaOH) × Mr (NaOH)
= 11 mmol × 40 g/mol
= 440 mg
≈ 0.44 g
NaOH
Step 2: Dissolve 0.44 g of NaOH in distilled water and transfer the solution to a volumetric flask of 100 mL.
Step 3: Fill the volumetric flask with distilled water to the 100-mL mark. Close the flask and invert it a few times to mix the contents well.
2. To prepare 1.00 L of 0.1 m
NaOH from your first solution, follow the steps:
Step 1: Calculate the volume of the first solution required.
1.00 L of 0.1 M NaOH
= 0.1 mol NaOH (NaOH)
= n (NaOH) × Mr (NaOH)
= 0.1 mol × 40 g/mol
= 4.0 g
NaOH
Step 2: Take the first solution and add it to a 1.00 L volumetric flask using a graduated cylinder.
Step 3: Add distilled water to the volumetric flask until the level reaches 1.00 L. Close the flask and invert it a few times to mix the contents well. This solution now has a molarity of 0.1 M NaOH.
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.In an experiment, to determine which antacid is the best at neutralizing stomach acid, HCl, which mimics the stomach acid, is heated and then afterward, an antacid is solved in it. Indicator drops are added (phenolphthalein). The solution is then titrated with the base NaOH until a slight pink is achieved.
1. Explain why was it important to warm up the solution after dissolving the antacid tablet in it?
2. Why was it important to let the solution cool down before conducting the titration experiment?
3. Write a balanced equation between HCl and NaOH:
In the experiment to determine the effectiveness of antacids in neutralizing stomach acid, several steps were followed.
The importance of warming up the solution after dissolving the antacid tablet is to enhance the reaction between the antacid and the stomach acid (HCl). Cooling down the solution before conducting the titration experiment is crucial to ensure accurate and precise measurement during the titration process. The balanced equation between HCl and NaOH is HCl + NaOH → NaCl + H2O.
Warming up the solution after dissolving the antacid tablet is important because it increases the rate of the chemical reaction between the antacid and the simulated stomach acid (HCl). Heating the solution provides energy, which facilitates the collision between reactant particles, leading to a faster reaction. By ensuring the reaction occurs at an elevated temperature, the experiment can accurately assess the antacid's effectiveness in neutralizing stomach acid under realistic conditions.
Allowing the solution to cool down before conducting the titration experiment is necessary to obtain accurate and reliable results. Cooling the solution ensures that the temperature is consistent and does not affect the reaction between the acid and the base during titration. Temperature influences the volume of the solution, and any variations can introduce errors in the volume measurements. Cooling the solution allows it to reach room temperature, which is the standard condition for most laboratory measurements, ensuring precise and consistent titration results.
The balanced equation between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is as follows:
HCl + NaOH → NaCl + H2O
In this neutralization reaction, hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to form sodium chloride (NaCl) and water (H2O). The equation shows the transfer of a hydrogen ion (H+) from the acid to the hydroxide ion (OH-) of the base, resulting in the formation of water and a salt. This equation represents the chemical process that occurs during the titration, where NaOH is used as the titrant to neutralize the HCl solution.
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A scientist thinks that monkeys can use calculators. To see if she was
right, she watched a group of monkeys for 30 days and kept track of any
calculations they made.
How was her investigation DIFFERENT from an experiment?
A. She did not make observations
B. She did not collect data
C. She did not have a hypothesis
D. She did not have a control group
Answer:C
Explanation:
describe what is the energy transferred from a battery powered motor
Answer:
The battery is a store of internal energy (shown as chemical energy). The energy is transferred through the wires to the lamp, which then transfers the energy to the surroundings as light. These are the useful energy transfers - we use electric lamps to light up our rooms.
Explanation:
1. How many protons does 9-Zr have? How many neutrons does 92Zr have?
Answer:question1 forty40
the second is fifty one 51
Explanation:
Help me plzzz !!!!!!!!!!!!!!!!!!!!!!!
How is the rock of the ocean floor formed?
It’s science not chemistry
Answer:
Rock is formed when the crust cracks, magma pushes up through the cracks, water cools it.
If a liquid has a density of 0.785, then any object with _____ density will float.
More
Less
While visiting his uncle's farm, Derek learned that horses and donkeys are two different species. Based on this
information, what can Derek infer about horses and donkeys?
Horses and donkeys cannot survive in the same
environment.
Horses and donkeys produce fertile offspring.
Horses and donkeys are members of the same
population.
Horses and donkeys are members of different
populations.
While visiting his uncle's farm, Derek learned that horses and donkeys are two different species. Based on this information, Derek can infer that horses and donkeys are members of different populations.
Since horses and donkeys are different species, they belong to different populations. A population refers to a group of individuals of the same species that live in the same area and can interbreed. While horses and donkeys can mate, their offspring, known as mules, are usually infertile.
This means that mules cannot produce offspring of their own, which indicates that horses and donkeys are not members of the same population. In contrast, if they were members of the same population, they would be able to produce fertile offspring. Therefore, Derek can infer that horses and donkeys are members of different populations.
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A car moves 76 km due east, then 40 km due west. What is its total displacement?
Answer:
36km
Explanation:
Since, East and West are two opposite directions, then,
total displacement should be 76-40= 36 km
What percent of an original sample remains after 3 half-lives? After 5 half-lives?
Answer:
Three half lives corresponds to (12)3 . So a 18 quantity of the original isotope is retained. And the percentage of quantity of a radioactive material that remains after 5 half-lives will be . ∴NN0×100=10032=3.125.
