What are 5 chemical changes?

Answer:

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. 1 mole of ZnI\(_2\) will result by the reaction of 1 mole of Zn with 1 mole of I\(_2\).

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.

The balanced equation is

\(Zn+ I_2\rightarrow ZnI2\)

To see the mole of zinc iodide we need to have the knowledge of stoichiometry chemistry. So, the mole ratio among Zn, I\(_2\) and \(ZnI_2\) are 1:1:1 that means to produce 1 mole of ZnI\(_2\), one of each Zn and I\(_2\) are required.

Therefore 1 mole of ZnI\(_2\) will result by the reaction of 1 mole of Zn with 1 mole of I\(_2\).

To know more about mole, here:

https://brainly.com/question/15209553

#SPJ2

The difference in lattice energies between MgCl2 and CaCl2 is 269 kJ.

2.    lattice disassociation enthalpy of magnesium oxide is greater than that  of magnesium chloride.

because magnesium chloride consist of 3 ions in total , whereas magnesium oxide has 2 ions and oxide ions are smaller than chloride ions, Which  means that the ions are closer together in the lattice of magnesium oxide than magnesium chloride , and which also increases the strength of the attractions.

learn more about lattice enthalpy of compounds here-

https://brainly.com/question/20814973

#SPJ9

Answer:

The tilt of the Earth's axis also defines the length of daylight.Daylight hours are shortest in each hemisphere winter. Between summer and winter

solistice the number of daylight hours decreases and the rate of decrease is larger the higher the latitude.The fewer sunlight hours the colder nights.

The data is provided as follows.

The evaporating dish's mass is 3.375 g.

total mass = mass of the solid sample plus the evaporating dish

Specifically, 26.719 g (Mass of solid sample + evaporating dish)

So, using the following formula, we can determine the mass of the solid sample.

mass of evaporating dish = (mass of evaporating dish - mass of solid sample)

= 26.719 g – 3.375 g

= 23.344 g

This leads us to the conclusion that his solid sample's mass must be 23.344 g.

A piece of glassware used in laboratories called an evaporating dish is used to evaporate solutions and supernatant liquids, sometimes to the point of melting.

The main significant distinction between an evaporating dish and a watch glass is that a watch glass typically lacks sides and rims and resembles a contact lens more in terms of shape. The reason behind the name of these objects is that they mimic the glass case of a wristwatch.

To know more about Evaporating dish please click here ; https://brainly.com/question/23131911

#SPJ4

The correct option is D as when sterilizing laboratory equipment with ethanol and a flame, neither option A nor option C should be done.

To reduce the chance of accident or fire when sterilizing lab equipment using ethanol and flame, it is important to follow the correct safety procedures. It is important to keep the alcohol completely away from the flame, not just as far away as possible. When exposed to an open flame, even small amounts of vapor from ethanol can catch fire.

It is also unwise to point the tip of the sterilizing tool upwards as given in option C. Any leftover ethanol may collect at the tip of the tool if it is held with the tip up, which increases the chance of flaring or igniting when it comes in contact with the alcohol.

Therefore, the correct option is D.

Learn more about Laboratory equipment, here:

https://brainly.com/question/28292877

#SPJ4

To determine if MgCO3 will precipitate from the solution, we need to compare the ion product (Q) with the solubility product (Ksp) of MgCO3. The ion product (Q) is calculated by multiplying the concentrations of the ions involved in the dissociation of MgCO3.

The balanced equation for the dissociation of MgCO3 is:

MgCO3(s) ⇌ Mg2+(aq) + CO32-(aq) Given that the concentration of Mg2+ is 1.5×10^−3 M, we can calculate the concentration of CO32- using stoichiometry. Since 1 mole of MgCO3 dissociates to give 1 mole of Mg2+ and 1 mole of CO32-, the concentration of CO32- is also 1.5×10^−3 M.

The ion product (Q) is then calculated as:

Q = [Mg2+][CO32-] = (1.5×10^−3 M)(1.5×10^−3 M) = 2.25×10^−6

Comparing Q with the solubility product (Ksp) of MgCO3 (6.82×10^−6), we find that Q < Ksp. This means that the ion product is smaller than the solubility product, indicating that no MgCO3 will precipitate from the solution. Therefore, based on the given concentrations and the solubility product of MgCO3, no MgCO3 will precipitate from the solution when 50.0 mg of Na2CO3 is added to 150.0 ml of the solution.

Learn more about solubility product here: brainly.com/question/31644336

#SPJ11

Answer: Energy stored in an object due to its position is Potential Energy. The energy that a moving object has due to its motion is Kinetic Energy. All forms of kinetic energy are the result of a previous state of potential energy. For example, the stored chemical potential energy of a battery converts to electrical kinetic energy to transport electricity to a light bulb, which radiates thermal kinetic energy. Potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.

Answer:

glucose and amino acids

Explanation:

The thickness of the material can be obtained as  0.013 cm.

We know that the thickness can be obtained from the density of the material. Remember that the density is an intrinsic property of the material. When we talk about the thickness, we are talking about how deep the material is.

We have;

Density of the material = 1.3 g/cm^3

Area of the material = 54.2 cm *  12.3 cm

= 666.7 cm^2

Density =  Mass/Area * Thickness

Density * Area * Thickness = Mass

Thickness = Mass/Density * Area

Thickness =  11.4 grams/666.7 cm^2 * 1.3 g/cm^3

Thickness = 0.013 cm

Learn more about thickness:https://brainly.com/question/23622259

#SPJ1

Answer:

more genetic variation within a population usually enables more phenotypic variation.

Explanation:

Because natural selection acts directly only on phenotypes,  Some new alleles increase an organism's ability to survive and reproduce, which then ensures the survival of the allele in the population.

Genetic variation lets the organisms survive long term as it increases the phenotypic and the genotypic variation.  Genetic variation is due to the type of reproduction that involves two parents.

Genetic variation is the modification of the original genome of the organism by genetic recombination and mutation that can be beneficial in the survival and the natural selection process.

Reproduction involving two parents of the same species allow genetic variation as the process of independent assortment and crossing over of the chromosomes inherited from both creates species with different traits and genotype.

Therefore, the reproduction involving two parents results in genetic variation.

Learn more about genetic variation here:

https://brainly.com/question/20665733

#SPJ2

The long-chain molecules that consist of many repeating units are called polymers. Polymers are large macromolecules composed of monomer units that are chemically bonded together in a repetitive pattern.

The repeating units, also known as monomers, are linked through covalent bonds, creating a chain-like structure.

Polymers can have various sizes and complexity, ranging from simple structures like polyethylene to highly intricate and specialized macromolecules like proteins and DNA.

It is noticed that due to their repeating nature, polymers often possess unique physical and chemical properties, making them useful in a wide range of applications, including plastics, textiles, adhesives, and biomedical materials.

Read more about Polymers.

https://brainly.com/question/1443134

#SPJ11

The picture represents gas exchange in the alveoli. CO\(_2\) will move out of the body. Therefore, the correct option is option A.

The walls of adjacent alveoli intersect to form curved surfaces on polygonal alveoli. Alveoli are interconnected because the flexibility and shape of nearby alveolar walls affect how they are built. Surface tensions at the air-fluid interfaces of the tiny airways and alveoli, lung tissue elasticity, and elasticity of the chest wall are the forces affecting the pulmonary microstructure. The picture represents gas exchange in the alveoli. CO\(_2\) will move out of the body.

Therefore, the correct option is option A.

To know more about alveoli, here:

https://brainly.com/question/11954250

#SPJ12

It’s 7.72 it took a while but I found the answer

Answer:

a) the balloons will shrink

b) temperature

c) volume of gas in the balloons

d) pressure and amount of the gas

e) The balloons can be set up and left at constant temperature. Possibly at room temperature to see if the same effect will be observed in it's volume.

Explanation:

Charles law states that, the volume of a given mass of gas is directly proportional to it's temperature at constant pressure.

Hence, if we manipulate the temperature of a gas (e.g by immersing it into cold nitrogen) it's volume changes in response to temperature change at constant pressure.

A balloon at constant room temperature will not experience any decrease in volume as the balloon in our experiment does.

work done on the ship if it moves 2000m is 15×\(10^{6}\)J

When an external pulling force is applied to an object, the object moves from one place to another or we can simply say that it changes its position. The amount of work required to move the object from its initial position to the final position is directly proportional to the force applied to the object.

Work done depends on two main components that is force and displacement of an object. The displacement of an object must happen along the line of action of the force in order for the force to do work on the object.

Work has units of energy because it is defined as an amount of (transferred) energy, so work usually has units of J (joules).

To calculate work the formula that we use is;

W = F × d, where W = work done, F = Force  and d = distance

W = 7500N × 2000m

W =  15×\(10^{6}\)J

Therefore 15×\(10^{6}\)J of work is done on the ship.

To know more about work done

https://brainly.com/question/13662169

#SPJ1

An individual breathes in about 10.94 cubic meters of air at STP in one day.

What is respiration ?

Respiration is the process by which living organisms, including humans, exchange gases with their environment. In the case of humans, respiration refers specifically to the process of exchanging oxygen and carbon dioxide between the lungs and the bloodstream.

Respiration consists of two main stages:

External respiration: It occurs in the lungs where oxygen from the air is exchanged for carbon dioxide in the blood.

Internal respiration: It occurs in the body's tissues where oxygen is released from the blood and carbon dioxide is taken up by the blood.

To calculate the volume of air breathed in one day at STP (Standard Temperature and Pressure), we can use the following formula:

V = (breathing rate) x (volume of air per breath) x (time per day)

Where:

breathing rate = 15 breaths per minute

volume of air per breath = 505 cm^3 = 0.000505 m^3 (converted from cubic centimeters to cubic meters)

time per day = 24 hours x 60 minutes per hour = 1440 minutes

Plugging in these values, we get:

V = 15 breaths/min x 0.000505 m^3/breath x 1440 min/day

V = 10.9356 m^3/day

Therefore, an individual breathes in about 10.94 cubic meters of air at STP in one day.

To know more about Respiratory system visit:-

https://brainly.com/question/24653210

#SPJ1

Answer:

D. an orbital notation of the atom

Explanation:

Orbital notiation uses lines and arrows to show shells, subshells, and orbitals for electrons in an atom. Since it shows arrows being paired up in this diagram it would be the best model for Chuck to use.

On Edgenuity2020, the answer is D) an orbital notation of the atom

The binding energy of silver-109 (Ag-109) in kJ/mol nucleons is not a well-defined concept, as binding energy is typically calculated for atomic nuclei rather than individual isotopes.

The binding energy of an atomic nucleus is the energy required to completely separate all of its constituent protons and neutrons into individual particles. It is usually expressed in units of energy per nucleon, which is the energy required to separate one proton or neutron from the nucleus.

The average binding energy per nucleon for an atomic nucleus is typically highest for medium-mass nuclei, such as those found in the region of the so-called "valley of stability" on the nuclear chart.

The binding energy per nucleon for silver-109 is not likely to be particularly high, as silver is a relatively heavy element and the binding energy per nucleon tends to decrease with increasing atomic number (Z).

Without more information about the specific calculation being used to determine the binding energy of Ag-109, it is not possible to accurately provide a value for the binding energy in kJ/mol nucleons.

The required masses (g/mol) are also not specified in the question, so it is not clear what context these values might be used in.

Learn more about binding energy:
https://brainly.com/question/29756225

#SPJ4

Answer:

The scientific term for table salt is Sodium chloride.

Explanation:

The answer is sodium chloride.

It is composed of sodium and chloride. Like,

\( {na}^{ + } + {cl}^{ + } = nacl\)

so, it's name is sodium chloride.

Answer:

HNO3 + Ca(OH)2 ====> H2O + Ca(NO3)2

it gives water and Calcium nitrate

Hope to helpfull.

Answer:

HNO3 + Ca(OH)2 ====> H2O + Ca(NO3)2

Pure water has a vapour pressure of 23.76 torr at 25 degrees Celsius.

According to Raoult's law, a solution's vapor pressure varies in direct proportion to the amount of solvent it contains by mole.

Vapor pressure is the force that a vapor applies on the condensed phases (solid or liquid) in a closed system when they are in thermodynamic equilibrium at a particular temperature (or equilibrium vapor pressure).

It is thought that the vapor is exerting pressure on the atmosphere. In other words, the higher the vapor pressure, the faster the evaporation of a liquid.

A liquid's vapor pressure is one of its properties and depends on the strength of its intermolecular forces. Liquids have higher vapor pressure and are easier to evaporate due to weak intermolecular interactions. Lower vapor is produced by a liquid with higher intermolecular interactions.

To know about solution

https://brainly.com/question/7932885

#SPJ4

Answer:

66

Explanation:

66

Answer:

Answer:

5.2

x 10

14

Hz

Explanation:

Answer: Na

Explanation:

Each arrow represents 1 electron

there are 11 arrows so there are 11 electrons

since the proton number is the same as the number of electrons (11), the answer is sodium (Na).

hope this helped

Answer:

2, 8, 8

Explanation:

The first electron shell always has 2 electrons when it is complete. The second electron shell and 3rd shell can hold 8 when completed.

Answer:

C (s) + O2 (g) > CO2 (g)

That's what I got

Protons (H⁺) are pumped across the inner mitochondrial membrane as part of the process called electron transport chain, which is an essential step in cellular respiration.

The electron transport chain is responsible for generating adenosine triphosphate (ATP), the main energy currency of cells.

During cellular respiration, electrons are transferred from high-energy molecules (such as glucose) through a series of electron carriers embedded in the inner mitochondrial membrane. As electrons pass through the electron transport chain, energy is released and used to pump protons (H⁺) from the mitochondrial matrix to the intermembrane space.

There are some several reasons;

Establishing an Electrochemical Gradient; The pumping of protons across the inner mitochondrial membrane creates an imbalance of protons, resulting in a higher concentration of protons in the intermembrane space compared to the matrix.

Generation of ATP; The electrochemical gradient created by the proton pumping is utilized by ATP synthase, an enzyme complex embedded in the inner mitochondrial membrane.

Coupling Electron Transport with Proton Pumping; The pumping of protons across the inner mitochondrial membrane is coupled with the flow of electrons through the electron transport chain.

To know more about mitochondrial membrane here

https://brainly.com/question/31808640

#SPJ4

Answer:

CaCO3 + 2HCl ---> CaCl2 + H2O + CO2

Explanation:

The reaction between solid calcium carbonate and a mineral acid such as aqueous HCl is a neutralization reaction and occurs with the evolution of CO2 gas.

The balanced equation is given below

CaCO3 + 2HCl ---> CaCl2 + H20 + CO2

The product CaCl2 is water soluble which accounts for why the stain is removed, while CO2 gas escapes away from the reaction surface.

Answer:

CaCO3(s) + 2HCl(aq) -------> CaCl2(aq) + 2CO2(g) + H2O(l)

Explanation:

CaCO3(s) + 2HCl(aq) -------> CaCl2(aq) + 2CO2(g) + H2O(l)

When an acid reacts with a metal carbonate a salt, carbon dioxide and water are formed. Hard water usually contain Ca^2+ in the form of Ca(HCO3)2. Minor heating causes CaCO3(calcium carbonate) to deposit on surfaces through which the hard water passes.

Calcium carbonate reacts with acids to produce a calcium salt, water and carbon dioxide: Calcium carbonate + Hydrochloric acid → Calcium chloride + Water + Carbon dioxide. The carbonate radical breaks up into carbon dioxide and oxygen; the oxygen binds with the acid's hydrogen ions to make water; and a solution of calcium chloride remains.

When comparing two substances, the substance exhibiting stronger intermolecular forces in the liquid phase has a higher boiling point

A higher boiling point: This is because stronger intermolecular forces require more energy to break apart the molecules and vaporize the liquid. Stronger intermolecular forces cause the liquid molecules to stick together more tightly at the surface, resulting in a higher surface tension.

Stronger intermolecular forces cause the liquid molecules to resist flowing past one another, resulting in a higher viscosity. Stronger intermolecular forces require more energy to vaporize the liquid, resulting in a higher heat of vaporization.  Stronger intermolecular forces cause fewer molecules to escape the surface and enter the gas phase, resulting in a lower vapor pressure.

Know more about intermolecular forces here:

https://brainly.com/question/9007693

#SPJ11

The bond energy is the energy that must be supplied to break the bond. Ionic substances are held together by strong bonds.

This question is incomplete but I will try to explain what is meant by average bond energy as the tables are missing.

The average bond energy of a bond simply means the energy that is stored in that bond as it holds two atoms together. It is equal to the energy that must be supplied to break the bond. The numerical value of the bond energy can not be deduced as the data is missing.

Learn more about bond energy: https://brainly.com/question/26141360