Chemistry High School
A, stirring a solution increases the amount of interactions between molecules
Calculate ∆h0 for the following reaction. br2( g. → br2(l)∆hf0 br2(
g. =30.91 kj/mol; ∆hf0 br2 (l) =0 kj/mol)
From the balance chemical reaction, it can be seen that a gaseous bromine is converted to liquid bromine. The heat of reaction is equal to the heat of the product minus the heat of the reactant. Following this, theΔhf0 is equal to,
Δhf0 = (0 kJ/mol) - (30.91 kJ/mol)
Δhf0 = -30.91 kJ/mol
-3.091 x 10^1 kJ is your answer! I hope this helps you!
The Mohs hardness scale increases linearly from 1 to 10.
The answer to this question isFALSE
Which of the following solutions has the highest concentration of sugar? A. A sweetened drink is mostly water mixed with 2 grams of sugar
B. A sugar solution in a bird feeder is 75% water and 25% sugar
C. There is not enough information to tell
D. the nectar of a flower is 15% sugar
I believe B is the correct answer
During a chemical reaction, mass and energy are both a. increased b.decreased c.consumed d.conserved
The answer should be D. conserved because mass is neither created nor destroyed during a chemical reaction.
Which reaction below represents a balanced, decomposition chemical reaction? A)
2MgO → Mg + O2
2Al + 3Br2 → 2AlBr3
2KClO3 → 2KCl + 3O2
C5H12 + 8O2 → 5CO2 + 6H2O
We can first rule out choices B and D because in decomposition reactions, one reactant is decomposed or broken up to form two or more products. Choices B and D are incorrect because they both have two reactants.
Then we need to determine which choice, A or C, is correctly balanced. Choice A is incorrectly balanced because there are 2 moles of magnesium on the reactants side but only one mole of magnesium on the products side. Therefore, C is the correct choice because it is correctly balanced.
Hope this helps.
Sand, also known as silicon dioxide, is the main component of glass. If a glass blower used 10 kg of sand, combined with .5 kg of sodium carbonate and 1.5 kg of calcium oxide to produce a glass bowl with a mass of 9 kg, how much material was wasted? A)
Sand, also known as silicon dioxide, is the main component of glass. If a glass blower used 10 kg of sand, combined with .5 kg of sodium carbonate and 1.5 kg of calcium oxide to produce a glass bowl with a mass of 9 kg, how much material was wasted?
mass of sand=10kg
mass of sodium carbonate=0.5kg
the mass of material wasted is 3kg
3 kg is the answer pal
Molecules of a gas _____. move fast and are close together
move fast and are far apart
move slowly and are close together
move slowly and are far apart
It is either A or B....
The answer is B. move fast and are far apart
True or False According to Schrodinger's model electrons are found in fixed orbits around the nucleus.
True. I hope this helps!
During alkalosis, which chemical is removed from the body by the kidneys? A. H+
The answer is B because it is obvious
How many atoms are present in a 1.0 mole sample of potassium perchlorate (KClO3)?
Answer: The number of atoms in 1.0 moles of potassium perchlorate is
We are given:
Moles of potassium perchlorate = 1.0 moles
According to mole concept:
1 mole of a compound contains number of molecules.
1 mole of contains 1 potassium atom, 1 chlorine atoms and 3 oxygen atoms.
Number of atoms in = 5
So, 1.0 moles of potassium perchlorate will contain = number of atoms.
Hence, the number of atoms in 1.0 moles of potassium perchlorate is
Okay, a mole of potassium perchlorate contains 6.02x1023 formula units of potassium perchlorate, but you're asking about individual atoms. So, let's look at the formula: KClO3. That's 1 potassium, 1 chlorine, and 3 oxygens, for a total of 5 atoms per formula unit. Now, multiple 5 by Avogadro's number above, to get 30.1x1023, which simplifies to 3.01x1024 atoms.
Calculate the distance in kilometers would travel in 5 hours at an average velocity of 10 km/hour to the south.
It would be 50 because if its 10km/hour just multiply (10*5=50)
Hope it helps:)
Find the speed of a mouse that runs 33 feet in 3 seconds.
The speed of the mouse is 11 ft/s
Find the velocity in m/s (meters per second) of a swimmer who swims 500 meters toward shore in 50 seconds.
To find the velocity, you would have to divide the meters given by the seconds given.
500 meters / 50 seconds = 10 meters per second.
Your answer would be 10 m/s
Hope this helps!
Which of the following is an endothermic reaction? a. burning wood
b. an explosion
c. burning a match
d. the cooling of an ice pack
I think is b.an explosion hope it works
The answer is
Which statement describes how an atom in the ground state becomes excited
Thegroundstate of an electron, the energy level it normally occupies, is the state of lowest energy for that electron. ... An electroncan become excitedif it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearbyatomor particle. (I do not take credit for that answer)
How can you tell from a substance's formula if it is ionic or molecular?
Once you identify the compound asIonic,Molecular, or an Acid, follow the individual ... chemicalformulas, writewhetherthe compound isionic or molecular, and...
What is the mass number of 207Pb ? A: 289 B: 207 C: 125 D: 82
207 is the mass number. 82 would be the atomic number
Molecules that possess only London dispersion forces generally have higher melting points than those with hydrogen bonding. True or False?
The correct option is False
London dispersion forces are a part of Van Der Waal's forces acting between atoms and molecules. They are a temporary attractive force that are formed when two atoms close to each other form a temporary dipole and are hence the weakest intermolecular force of attraction. They are usually the force of attraction found between non-polar molecules.
While a hydrogen bonding a strong intermolecular force (dipole-dipole) of attraction formed as a result of the interaction between an electronegative atom (like oxygen or chlorine) and a hydrogen atom bonded to another electronegative atom (like fluorine). Since, molecules that posses hydrogen bonding have stronger intermolecular forces, they thus possess higher melting point than molecules that possess only London dispersion forces.
It is True not false ok
In the relationship between ΔG and K for a given reaction, if ΔG is negative, what is K? K is equal to 0. K is equal to 1. K is less than 1. K is greater than 1. Done
K is greater than 1. #platolivesmatter
Answer:D for plato
Which is a characteristic of the electron sea model for metallic bonding Molecular orbitals overlap to produce Bands
Electrons flow easily between metal nuclei
Atomic nuclei are arranged in an irregular pattern
The bonding in metals is sometimes decribed as a "Sea of delocalise electrons" this is because the metal atoms are all regularly arranged and are surrounded in free delocalised electrons that can Flow easily between the metal nucli so therefore the answer is the second answer
Hope that helps
According to the electron sea model for metallic bonding, in the sample of metal atom all the atoms contribute their valence electrons which form a delocalized “sea” of electrons. The arrangement of metal ions is in an orderly array with this mobile sea of electrons. The metal is held together due to the attraction between sea of electrons and cations.
Hence, electrons flow easily between metal nuclei is a characteristic of the electron sea model for metallic bonding.
1. Stirring A Solution A. Increases The Rate At Which Solute And Solvent Particles Contact Each Other? ›
How does stirring speed up dissolving? Stirring a solution speeds up the dissolving process by making the solvent and solute particles move faster. More solvent particles come into contact with more solute particles. The solid solute dissolves more quickly.Does stirring increase rate of solution? ›
Breaking a solute into smaller pieces increases its surface area and increases its rate of solution. Stirring -- With liquid and solid solutes, stirring brings fresh portions of the solvent in contact with the solute. Stirring, therefore, allows the solute to dissolve faster.Why does stirring increase the rate at which a solute dissolves into a solvent? ›
The stirring allows fresh solvent molecules to continually be in contact with the solute. If it is not stirred, then the water right at the surface of the solute becomes saturated with dissolved sugar molecules, meaning that it is more difficult for additional solute to dissolve.What increases by stirring? ›
Stirring affects the rate of dissolving because it spreads the solvent's molecules around the solute and increases the chance of them coming into contact with each other faster. As a result, mechanical stirring increases solubility of the solute in the solvent.Does stirring the solution increase or decrease the solubility of solute in a solvent? ›
Stirring the solution decreases the solubility of the solute in the solution.What happens when you stir a solution? ›
Stirring a solution speeds up the dissolving process by making the solvent and solute particles move faster. More solvent particles come into contact with more solute particles. The solid solute dissolves more quickly.Does stirring slow down the rate of dissolution? ›
Stirring a liquid, no matter the temperature, helps a mixture dissolve. If the mixture is being stirred it will dissolve a lot faster even if the water temperature is not hot. The dissolving rate of a mixture will increase significantly if the temperature is high, the mixture is stirred, and the particle size is small.What is the affect of stirring a mixture on it's reaction rate? ›
In solution, enhancing the reactants concentration enhances the no of reactant particles that enhances the no of collisions whereby the rate of reaction would enhance. Stirring would be keeping the reactant particles within motion thereby enhancing the opportunities of collision enhancing the rate of reaction.How does stirring speed affect solubility? ›
Answer and Explanation: Stirring the solution will increase the solubility of the solution. This happens because stirring allows the solute molecules to always be in contact with the solvent molecules.How does stirring affect the rate at which salt dissolves in water? ›
Agitation and stirring will increase the rate at which salt dissolves in water.
The explanation of the stirring effect is based on the theories of diffusion-controlled reactions and hydrodynamic turbulence. We show that an increase of the stirring rate leads to an increase of the rate constant for the diffusion-controlled reaction.Does stirring increase or decrease temperature? ›
Stirring will help cool a hot drink because it speeds up the process of convection by bringing the hottest liquid at the bottom to the top, where it can be cooled by the air. But in truth, convection occurs pretty quickly anyway, and you're only slightly speeding it up.What is the meaning of stirring effect? ›
rousing, exciting, or thrilling: a stirring speech.Will stirring a solution increase the solubility of a solute in a given solvent all other factors remaining the same? ›
Stirring or sonication are often necessary to increase the speed of dissolution, but they do not have an impact on the solubility of a substance. Because solubility is not affected by the rate of solution (how quickly a substance dissolves), rate should never be factored into decisions on the solubility of a substance.Does stirring increase the solubility of salt water? ›
When salt is dissolved in water then the ions so formed get hydrated by the water molecules and decrease the movement of water molecules and solubility also decreases, hence, on agitation and stirring the solubility increases.How does stirring affect solvation? ›
Stirring affects the solvation by moving the solute particle thoroughly throughout the solvent, So that solute is dissolved quickly.What happens to the liquid after stirring? ›
Due to viscosity, the layer which is in contact with the wall of the container restricts the motion of before layer and this continues till the liquid comes to rest.What happens when water is stirred? ›
Stirring allows hot liquid to reach the surface much faster than unassisted convection. At the surface this hot water evaporates cooling the remaining water as a result.What happens if the water is stirred? ›
When water is stirred in a glass tumbler then the water starts moving in different layers and then comes to rest after some time. Water when it is stirred in a glass tumbler then the different layers of water will be moving with a distinct layer of water will be moving with varied velocities.Is stirring increases the speed of dissolution True or false? ›
The correct option is A True
Stirring speeds up the process of dissolving a solute in the solvent. 🔹By increasing the amount of the solvent.
Stirring a liquid while you are mixing in another ingredient speeds up the rate of dissolving. This is because it helps distribute the particles that are being dissolved. What happens when you add sugar (the solute) to iced tea (the solvent) and then stir the tea? The obvious answer is that the sugar will dissolve.Does stirring constantly make the solute particles dissolve slowly? ›
Stirring affects how quickly a solute dissolves in a solvent, but has no effect on how much solute will dissolve. The amount of solute that will dissolve is affected by temperature - more will dissolve at higher temperatures. This is called the solubility of the solute .How does stirring affect the rate of reaction? ›
Stirring keeps reactant particles in motion increasing the chances of collision and increasing the rate of reaction. Some reactions occur very slowly in the dark but much more quickly in light.Why does stirring decrease the rate of solution? ›
The stirring allows fresh solvent molecules to continually be in contact with the solute. If it is not stirred, then the water right at the surface of the solute becomes saturated with dissolved sugar molecules, meaning that it is more difficult for additional solute to dissolve.Does stirring a solution affect solubility? ›
There are two direct factors that affect solubility: temperature and pressure. Temperature affects the solubility of both solids and gases, but pressure only affects the solubility of gases.Does stirring speed up the rate of diffusion? ›
Stirring increases the rate of diffusion and will increase the rate of dissolution. Another important factor is surface area.Is stirring does not affect the solubility of solid solutes? ›
Constant stirring increases the rate of dissolution, because stirring changes the particular solvent molecules that are in contact with undissolved solute. Because the solubility of solids and liquids generally increases with temperature, solids and liquids are often dissolved in warm solvents.How does stirring help in dissolving a substance in water? ›
Stirring simply moves the solvent molecules around, allowing them to interact with the solid pieces of undissolved solute and transporting the dissolved solute away into the bulk of the solution.Does increasing the of a solvent increase the solubility of the solute? ›
This is because, with an increase in temperature, the space between molecules of liquid increases. Thus there is a more empty space for a solid molecule to accommodate. Thus solubility of solid solute increases in a liquid solvent.How does stirring help with diffusion? ›
Both diffusion and stirring govern the behaviour of the migrants; diffusion depends on the mean value of the diffusion coefficient and stirring forces the particles to move in a specific manner.
The extent of mixing of the reactants influences the frequency of molecular collisions - if reactants are more thoroughly mixed, the molecules will collide more often and thus react faster.What is stirring vs diffusion? ›
Stirring is a large-scale non-equilibrium process, just what you might do with a spoon to mix up some cake batter. These large-scale motions can help mix things together on a large scale. diffusion can then complete the process by mixing things on a small scale.