Determine the number of ions produced in the dissociation of the compound listed. CaCl2

Final answer:

Zinc is used to protect bridges and automobiles from corrosion because it is more easily oxidized than iron, providing sacrificial protection. Electroplating is not commonly used because it results in a thinner and less durable zinc layer.

Explanation:

Zinc is often used to protect bridges and automobiles from corrosion because it is more easily oxidized than iron. This means that even if the zinc coating gets scratched, the zinc will still oxidize before the iron, providing a sacrificial protection. While electroplating could be an option, it is not commonly used because it results in a thinner and less durable zinc layer compared to other coating methods.

Answer:

A: 238 g

B: 224 g

Explanation:

Data given:

A.

number of moles of H₂O₂ = 7.00 mole

mass of H₂O₂ = ?

B.

number of moles of NaOH = 5.60 mole

mass of NaOH = ?

Solution:

Part A:

Formula will be used

               no. of moles = mass in grams / molar mass

As we have to calculate mass of substance

So, rearrange the above equation

             mass in grams =  no. of moles x molar mass . . . . . . (1)

Molar Mass of H₂O₂ = 2(1) + 2(16)

Molar Mass of H₂O₂ = 2 + 32

Molar Mass of H₂O₂ = 34 g/mol

Put values in equation 1

                 mass in grams = 7.00 mol x 34 g/mol

                 mass in grams =  238 g

mass of H₂O₂ = 238 g

_______________________

Part B:

Formula will be used

               no. of moles = mass in grams / molar mass

As we have to calculate mass of substance

So, rearrange the above equation

             mass in grams =  no. of moles x molar mass . . . . . . (1)

Molar Mass of NaOH = 23 + 16 + 1

Molar Mass of NaOH  = 40 g/mol

Put values in equation 1

                 mass in grams = 5.60 mol x 40 g/mol

                 mass in grams =  224 g

mass of NaOH = 224 g

Answer:

3

Explanation:

Primary waves are radiated along a single direction, but secondary waves are radiated along all directions. That is why the P waves can take place in almost all mediums such as solid, liquid and air, unlike the S waves that are transverse and only travel through solid mediums

Answer:

I think the answer is 13H

Explanation:

The best known example of a naturally-occurring radioisotope is uranium. All but 0.7 per cent of naturally-occurring uranium is uranium-238; the rest is the less stable, or more radioactive, uranium-235, which has three fewer neutrons in its nucleus.

Answer:

263 g

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created not destroyed in a chemical equation.

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

Thus in given example the mass of reactant is 263 g therefore the mass of product would be 263 g.

Another example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass

Answer:

The fraction of original isotope remaining after 12 weeks is 1/8 (0.125)

Explanation:

The half life of the radio-isotope = 4 weeks =[tex]t_{\frac{1}{2}}[/tex]

After n half lives, the fraction of original isotope remaining = [tex]\frac{1}{2^{n}}[/tex]

In 12 weeks, the number of half lives = 12/4 = 3 half lives

The fraction of original isotope remaining = [tex]\frac{1}{2^{3}}=\frac{1}{8}[/tex]

Hence, after 12 weeks, fraction of original isotope remaining is 1/8 (0.125)

Answer:

The natural method of removal of CO2 is

Photosynthesis by plants

Absorption of CO2 from the atmosphere by ocean water

Melting of glacial ice

Explanation:

Respiration of living organism : In this process, Oxygen is consumed(removed) and Carbon dioxide(CO2 ) is formed.So it forms CO2 .

Photosynthesis by plants: Green plant containing. prepare their food in presence of sunlight by using CO2 , water ,Hence CO2 is removed from atmosphere.

Evaporation of ocean water : It increases the level of CO2 in atmosphere. The heating of oceans surface Degassed CO2 to atmosphere.

Absorption of CO2 from the atmosphere by ocean water : the plants under the oceans needs CO2 to carry out photosynthesis .Hence oceans absorbs CO2 from atmosphere .Here, CO2 is removed from atmosphere.

Melting of glacial ice : Glacial ice absorb carbon dioxide because it does not have organism respiration (organisms releasing CO2 ).They capture large amount of CO2 and called CO2 sinks.(Remove CO2)

Answer:photosynthesis by plants

absorption of CO2 from the atmosphere by ocean water

Explanation:

Photosynthesis involves the combination of CO2 with water to form glucose and subsequently complex carbohydrates. Plants constitute a very important sink for carbon IV oxide in nature. Secondly, oceans absorb carbon IV oxide to maintain the concentration of bicarbonate in the water. These are two important natural methods that remove CO2 from the environment.

Answer:

Halogens have 7 valence electrons.

Explanation:

They are the most active non-metals including fluorine, chlorine, bromine, iodine, and astatine

Answer:

Minimizing repulsion by maximizing the bond angles

Explanation:

VSEPR is defined as 'valence shell electron pair repulsion' theory. The key principle is that repulsion of adjacent lone pairs of electrons or the electrons that are shared within a bond creates bond angles.

The bond angles are maximized in order to minimize the repulsion in the most stable geometrical shape of the molecule.

That said, in VSEPR theory we tend to achieve the greatest possible angles between the bonds and lone pair electrons in order to obtain the lowest repulsion between them.

Answer & Explanation:

D orbitals begin filling with electrons after the orbital found in the 4s sublevel is filled. This occurs because the d sublevel is first found in the.

Answer:

Interesting question.

Explanation:

D orbitals begin filling with electrons after the orbital found in the 4s sublevel is filled.

Have a good day

Answer:

c

Explanation:

Answer:

A. One that is not a fossil fuel  

Explanation:

"Alternative fuel" is a technical term used in the fuel industry. It refers to fuels that that are not fossil fuels (like coal, oil, and natural gas).

B. is wrong. A fuel that hasn't been developed yet is not of much use.

C. is wrong. A homeowner may consider wood as an alternative fuel in case there is no electricity to power an oil furnace, but that is not the technical meaning of the term.

D. is wrong. An alternative fuel should use renewable resources.

this will have ur answer

       .

   .   pb  .

        .

Answer:

Radon

Explanation:

Group eighteen elements are called noble gases. This group includes helium, neon, argon, krypton, xenon and radon.

Radon is present at the last of this column.

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.

Thus radon has largest atomic radius.

Answer:Rn =Radon

Explanation:

Answer:

Grass, deer, wolf, fungi.

Explanation:

The tropical level of an organism is defined as the position of organism occupied in the food chain. The food chain is starts from tropical level one which is primary producers (such as plants), then move to herbivores (such as deer) in level two, carnivores, (such as wolf) at level three, apex predators in level four (such as lions), and it ends in decomposers such as fungi.

Fungi play important role in ecosystem to help in breakdown of dead organic matter and return nutrients to the soil. Without fungi nutrients cannot cycle in an ecosystem, and causing the breakdown of entire food web.

ans is A liquid........

Answer:

A.Liquid has no definite shape but does have a definite volume.

Explanation:

Hope it helps

Answer:

1. [tex]0.5 g/mL[/tex]

2. [tex]0.88 g/cm^3[/tex]

3. It has the greatest mass to volume ratio

4. Incomplete

5. [tex]H^+ (aq)+OH^-(aq)\rightleftharpoons H_2O (l)[/tex]

6. 1

7. Gloves, goggles, coat, mask

8. Flush with tap water for at least 15 minutes

9. The facts are listed below

10. Mass and volume

12. All matter consists of moving particles, the degree of their movement is directly proportional to their kinetic energy

Explanation:

1. In order to solve for density, we should know that density is the ratio between mass and volume of a liquid. In this case, we're given both measures: given mass of m = 20 g and volume of V = 40 mL, we may simply apply the equation of density described here:

[tex]d=\frac{m}{V}[/tex]

Substituting the variables, we obtain:

[tex]d=\frac{m}{V}=\frac{20 g}{40 mL}=0.5 g/mL[/tex]

2. Given a mixture of several liquids, it's important to understand that liquids with a greater density will tend to form a bottom layer of a solution, while liquids with a lower density will tend to form a top layer of a solution. Here we have a liquid with a density of [tex]d_1 = 1.0 g/cm^3[/tex] and another liquid with a density of [tex]d_2 = 0.88 g/cm^3[/tex]. Notice that [tex]d_1[/tex] > [tex]d_2[/tex].

This implies that the liquid with a density of [tex]0.88 g/cm^3[/tex] would be on top, as its density is lower than the density of the other liquid with a density of [tex]1.0 g/cm^3[/tex].

3. The solid phase is not always, but typically denser than liquids or gases. There are some exceptions to this rule, for example, ice, a solid phase of water, is less dense than liquid water.

However, for the majority of cases this statement is true. Remember that solid phases are the most ordered phases with atoms being packed closely to each other. In liquids, atoms are more dispersed with distances between them being greater than those in solids. Similarly, gases have the greatest distances between gas atoms among all three phases.

Since density is directly proportional to mass, let's say we take the same volume of a solid, a liquid and a gas. For the same volume, since we'll have a greater number of solid atoms than for a liquid or a gas (because solid atoms are more closely packed with lower average distances between the atoms), the mass to volume ratio will be the greatest for solids.

4. This seems to be an incomplete question.

5. In order to balance the following ionic equation, we need to follow the mass and charge balancing rules. Firstly, expand a water molecule showing the individual parts of it:

[tex]H-OH[/tex]

Secondly, notice that we need to add a hydroxide anion to the proton, so that we obtain the same number of protons and hydroxide anions on the left side, as well as the number of hydrogen and oxygen atoms on the right. This way, the net charge on the left hand side (0) and the net charge on the right hand side (0) are equal, so the charge is balanced as well. We obtain:

[tex]H^+ (aq)+OH^-(aq)\rightleftharpoons H_2O (l)[/tex]

6. We should be familiar with the ionization constant of water in the context of this problem. It is defined as the product between the hydronium ions and hydroxide ions and is a constant number at some given temperature. For pure water, the concentration of hydronium ions is balanced by the concentration of hydroxide anions to yield a neutral pH value, meaning the ratio of one with respect to the other would be 1.

For example, at room temperature, the ionization constant of water is defined as:

[tex]K_w=[H^+][OH^-]=10^{-14}[/tex]

Since we have pure water:

[tex][H^+]=[OH^-]=\sqrt{10^{-14}}=10^{-7}[/tex]

Then the ratio is:

[tex]\frac{[H^+]}{[OH^-]}=\frac{10^{-7}}{10^{-7}}=1

7 to 12. The questions are explained in the file attached.

Answer:

Explanation:

14:

a) Shared pairs = 6

per shared pair between each C-H bond.

and two shared pair between C=C thus total shared pairs are 6

a) Lone pairs = 0

b) Single bonds = 4

Double bonds = 1

Triple bonds = 0

c) Formula = C₂H₄

Name = Ethene

d) Lewis structure =  given structure is also Lewis structure.

13:

a) Shared pairs = 3

a) Lone pairs = 2

b) Single bonds = 0

Double bonds = 0

Triple bonds = 1

c) Formula = N₂

Name = Dinitrogen

d) Lewis structure = given structure is also Lewis structure.

D

Molecular motion increases as temperature increases and therefore increasing the molecular motion increases collision frequency.

Explanation:

When a substance is heated, its molecules gain increased kinetic energy even as the substance increases in temperatures. With higher kinetic energy, this means the molecules are moving more rapidly and hence collision between the molecules will be more frequent and of higher energy. It is these high energy collisions that cause the molecules to move further away from each other with increased temperatures (why substances expand).  

Learn More:

For more on relationship between temperatures and molecular motion check out;

https://brainly.com/question/11659700

https://brainly.com/question/874953

https://brainly.com/question/2731193

https://brainly.com/question/2731193

https://brainly.com/question/2257506

#LearnWithBrainly

Answer: Your answer would be D

Explanation: This is because whenever the collision increases the molecular motion increases with it.

Answer:

7628 y

Explanation:

Carbon-14 is radioactive and it follows the first-order kinetics for a radioactive decay. The first-order kinetics may be described by the following integrated rate law:

[tex]ln(\frac{[A]_t}{[A]_o})=-kt[/tex]

Here:

[tex][A]_t[/tex] is the mass, moles, molarity or percentage of the material left at some time of interest t;

[tex][A]_o[/tex] is the mass, moles, molarity or percentage of the material initially, we know that initially we expect to have 100 % of carbon-14 before it starts to decay;

[tex]k = \frac{ln(2)}{T_{\frac{1}{2}}}[/tex] is the rate constant;

[tex]t[/tex] is time.

The equation becomes:

[tex]ln(\frac{[A]_t}{[A]_o})=-\frac{ln(2)}{T_{\frac{1}{2}}}t[/tex]

Given:

[tex]\frac{[A]_t}{[A]_o} = \frac{40.0 %}{100.0 %}[/tex]

[tex]T_{\frac{1}{2}} = 5770 y[/tex]

Solve for time:

[tex]t = -\frac{ln(\frac{[A]_t}{[A]_o})\cdot T_{\frac{1}{2}}}{ln(2)}[/tex]

In this case:

[tex]t = -\frac{ln(\frac{40.0\%}{100.0\%})\cdot 5770 y}{ln(2)}[/tex]

[tex]t = 7628 y[/tex]

Answer:

The correct option is C) All of the genetic information comes from one parent.

Explanation:

The description in the paragraph tells that Astrammina rara are unicellular organisms and their offspring born are identical to the parent cell.

Asexual reproduction can be described as a method of reproduction in which a parent cells produces two offsprings which are identical to the parent cell. Asexual reproduction is the common mode of reproduction in unicellular organisms.

Hence, the description shows that Astrammina rara reproduce by this method and hence all of the information will arise from one, single parent.

Answer:

19.12 moles of NO will produced.

Explanation:

Given data:

Mass of ammonia = 325 g

Moles of NO produced = ?

Solution:

Chemical equation:

4NH₃ + 5O₂ → 4NO + 6H₂O

Number of moles of Ammonia:

Number of moles = mass/ molar mass

Number of moles = 325 g/ 17 g/mol

Number of moles = 19.12 mol

Now we will compare the moles of ammonia and NO.

                   NH₃              :                NO

                      4                :                 4

                     19.12           :              19.12

Thus 19.12 moles of NO will produced.

8) 21.504 liters of gas

9) 122.5 g

10) 6.022*10^23

Explanation:

8)

1 mole= 22.4 liters

to calculate the volume of gas of 0.960 moles of CH4

22.4*0.960/1

= 21.504 liters of gas  

9)

2.0 mole*18.02 g/ 1 mole

=122.5 g

10)

2.0 l * 1 mole/22.4 l

6.022*10^23

Explanation:

In a chemical reaction, only the atoms present in the reactants can end up in the products. Also, In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Answer:

7

Explanation:

Atomic number of X = 3

Atomic mass of X = 6.94 amu

1st isotope atomic mass = 6 amu

2nd isotope atomic mass = 7 amu

Which is more abundant isotope = ?

Explanation:

we know there are two naturally occurring isotopes of given element X, X-6  and X-7.

First of all we will set the fraction for both isotopes

x for the isotopes having mass 6

1-x for isotopes having mass 7

The average atomic mass of X = 6.94 amu

we will use the following equation,

6x + 7 (1-x) = 6.94

6x + 7 - 7x = 6.94

6x- 7x = 6.94 - 7

-1x = -0.06

x= -0.06/-1

x= 0.06

0.06 × 100 = 6%

6% is abundance of X-6 because we solve the fraction x.

now we will calculate the abundance of X-7.

(1-x)

1-0.06 =0.94

0.94 × 100= 94%

94% for X-7.

Answer:

NaCl (common salt)

Explanation:

it is called sodium chloride

A chemical formula is a symbolic representation of a compound's composition. It uses element symbols and subscripts to denote the types of atoms present and their quantities. The formula H₂O represents water, while H₂SO₄ represents sulfuric acid, with N₂O₃ being the formula for dinitrogen trioxide.

A chemical formula represents a substance using symbols for its constituent elements and subscripts to show the number of atoms of each element in the compound. For example, the compound water has a chemical formula of H₂O, indicating it contains two hydrogen atoms and one oxygen atom. Another example is sulfuric acid, a widely produced chemical with a formula of H₂SO₄, showing it is composed of two hydrogen atoms, one sulfur atom, and four oxygen atoms. The naming convention for covalent compounds like dinitrogen trioxide involves using prefixes to denote the number of each type of atom present; thus, N₂O₃ denotes two nitrogen atoms and three oxygen atoms.

Answer:

Positive effect -  allow the search and development of environmental friendly sources, to decrease the risk of polluents in the ozone (in the world).

Negative effect - environmental imbalances like: toxic gas leaks, river and soil contamination, etc.

Explanation:

   Ozone (O3) is one of the gases that make up the atmosphere and about 90% of its molecules are concentrated between 20 and 35 km altitude, called the Ozone Layer. Its importance is that it is the only gas that filters out type B ultraviolet radiation (UV-B), which is harmful to living beings.  

  Ozone has different functions in the atmosphere depending on its altitude. In the stratosphere, ozone is created when solar ultraviolet radiation interacts with the oxygen molecule, breaking it into two oxygen atoms (O). The released oxygen atom attaches itself to an oxygen molecule (O2), thus forming ozone (O3). In the stratospheric region, 90% of type B ultraviolet radiation is absorbed by ozone.  At ground level in the troposphere, ozone loses its protective function and becomes a polluting gas, responsible for increasing surface temperature, together with carbon monoxide (CO), carbon dioxide (CO2), methane (CH4) and nitrous oxide.

  Several chemicals are destroying ozone. By reacting with it, the nitric and nitrous oxides expelled from vehicles and the CO2 produced by burning fossil fuels such as coal and oil are destroying the protective layer of the planet, opening holes in it.

  To reduce gas emissions, chemical professionals have been studying in depth the substitution of fossil energy, which generates a lot of pollution, by the so-called renewable energy. Other example can be the electric car, which is environmentally friendly because it does not emit polluting gases, is already a reality, sold in many countries. So, this a positive effect of chemistry nowadays, which it can allow the search for environmental friendly sources, to decrease the risk of polluents.

     But associated with progress, we have a multitude of environmental imbalances. Toxic gas leaks, river and soil contamination and poisoning by ingestion of contaminated food are problems shown daily - these could be some negative effects of chemistry nowadays.

Answer:

The benefits of CFCs include their use as coolants.

CFCs can be used as foaming agents and fire extinguishers.

CFCs, when released into the atmosphere, destroy ozone in the stratosphere.

CFCs destroy ozone in the stratosphere, which is the chemical layer that shields living things from too much ultraviolet radiation from the sun.

Answer:

Newton's second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate acceleration

Explanation:

Answer:

Newton's laws can be experimentally verified because Newton's second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate the acceleration. And so, using the equations and formulas we can use them and verify the laws.

Explanation:

good luck yalls ;P

Answer:

provide rewards to use solar power

Explanation:

Using solar power we can avoid bad energy like Coal, oil, natural gas, uranium and water from a dam.

All these kinds of energy producing air pollution, water pollution, or greenhouse gases.

But solar power has some toxic materials, also, using a lot of water to keep and clean solar power. In addition, if we create a solar power near a river or lake may cause damage.

We must think in these factors before to do a solar power.