What can you infer about the results of numerical models in 1966 for polar caps
made of water ice?

Answer:

The correct option is desertification

Explanation:

Deforestation is the deliberate act of pulling down trees to provide a clear land for space or to make use of the trees for other purposes  such as grazing, farming, timber fire wood, building and constructions, urban utilization, access roads, expansion, development of infrastructures, grazing of cattle and mining

The effects of deforestation includes climate change, flooding, increase in the proportion of green house gases in the atmosphere, soil erosion and desertification.

A negative effect of deforestation is desertification.

Deforestation refers to the cutting down of trees. There are many reasons why people may cut down trees. One of the popular reasons why people cut down trees is to obtain timber which is used for construction and as fuel.

An important consequence of the felling of trees also called deforestation is that a once fertile land may gradually be turned into a desert area. This is known as desertification.

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Heterogeneous 'mixtures' (because they don't meet the definition  of mixtures) are mixtures substances that aren't completely uniformly spread out. They haven't reacted with the solvent to become a solution.

Explanation: There are 2 types of heterogeneous solutions, A Colloid and a suspension.

Colloid: You can check if a mixture is heterogeneous by passing a light ray through it. This may cause the Tyndall effect (If the mixture is a colloid) when the Colloidal Heterogeneous mixture's particles are so small that they refract the beam of light and the path of light will be visible, like if you add 3 drops of milk in a glass of Water and shine a laser light through it. This is because the particles are too small to be seen by the unaided eye but big enough to scatter you laser light. However that particles won't settle down or will be separated by a filter paper due to particles' small size.

Suspension: A solution will be a solution when the particles of the Mixture is big enough to be seen by the unaided eye. Like if you mix sand and Water, the sand will eventually settle down due to Gravity. The mixture's solute will be big enough to pass through a filter paper.

Answer:

Valency of Chlorine is 1 because it needs 1 electron to complete its octet (a shell of eight electrons). Valency is defined as "The combining power of an element" and Since, chlorine needs 1 electron to complete its valence shell, Its valency is 1.

Answer:

It’s D

Explanation:

Answer:

D Rocks change from one type to another in a specific order.

Explanation:

Answer:

Relative volume of ether to water that should be used for the extraction = 1.205

Explanation:

The extraction/distribution coefficient of an arbitrary solvent to water for a given substance is expressed as the mass concentration of the substance in the arbitrary solvent (C₁) divided by the mass concentration of the substance in water (C₂).

K = (C₁/C₂)

Let the initial mass of the organic substance X in water be 1 g (it could be any mass basically, it is just to select a right basis, since we are basically working with percentages here).

If 94% of the organic substance X is extracted by ether in a single extraction, 0.94 g ends up in ether and 0.06 g of the organic substance X that remains in water.

Let the volume of ether required be x mL.

Let the volume of water required be y mL.

Relative volume of ether to water that should be used for the extraction = (x/y)

Mass concentration of the organic substance X in ether = (0.94/x)

Mass concentration of organic substance X in water = (0.06/y)

The distribution coefficient , Ko (Cether / C water), for an organic substance X at room temperature is 13.

13 = (0.94/x) ÷ (0.06/y)

13 = (0.94/x) × (y/0.06)

13 = (15.667y/x)

(x/y) = (15.667/13) = 1.205

Hope this Helps!!!

The mole is used to measure small particles like atoms and molecules.  The 4 moles of silver is equivalent to [tex]\bold{2.408 x 10^2^4 }[/tex] atoms.

Given here,

The number of atoms

[tex]\bold{2.408 x 10^2^4 }[/tex]

Number of moles = ?

1 mol of substance = [tex]\bold{ 6.02 x10^2^3}[/tex]

Hence,

moles of silver,

[tex]\bold {= \dfrac {2.408 x 10^2^4 } { 6.02 x10^2^3} }}\\\\\bold {= 4 mol}[/tex]

Therefore, the 4 moles of silver is equivalent to [tex]\bold{2.408 x 10^2^4 }[/tex] atoms.

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Answer:

because your parents carry the recessice gene or they are blond

Explanation:

it could also be ffrom a mutation or just because you dyed your hair

Canthomythisphere

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Answer:

There are [tex]1.202\times 10^{24}[/tex] atoms and [tex]1.502\times 10^{23}[/tex] molecules in the compound.

Explanation:

The molar mass of the sulphur is [tex]32.065\,\frac{g}{mol}[/tex]. The Avogradro's Law states that exists [tex]6.022\times 10^{23}\,\frac{atom}{mol}[/tex]. The quantity of atoms in a quantity of mass is derived from dividing the mass by the molar mass and multiplying it by the Avogadro's Number. That is:

[tex]n_{atom} = m_{S}\cdot \frac{n_{A}}{M_{S}}[/tex]

Where:

[tex]m_{S}[/tex] - Mass of the sample, measured in grams.

[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.

[tex]M_{S}[/tex] - Molar mass of the sulphur, measured in grams per mole.

If [tex]m_{S} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{atoms}{mol}[/tex] and [tex]M_{S} = 32.065\,\frac{g}{mol}[/tex], then:

[tex]n_{atom} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{atoms}{mol} }{32.065\,\frac{g}{mol} }\right)[/tex]

[tex]n_{atom} = 1.202\times 10^{24}\,atoms[/tex]

There are [tex]1.202\times 10^{24}[/tex] atoms in the compound.

Now, the molecular weight of the compound is:

[tex]M_{S_{8}} = 8\cdot \left(32.065\,\frac{g}{mol} \right)[/tex]

[tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex]

The quantity of molecules in a quantity of mass is derived from dividing the mass by the molecular weight and multiplying it by the Avogadro's Number. That is:

[tex]n_{molecule} = m_{S_{8}}\cdot \frac{n_{A}}{M_{S_{8}}}[/tex]

Where:

[tex]m_{S_{8}}[/tex] - Mass of the sample, measured in grams.

[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.

[tex]M_{S_{8}}[/tex] - Molecular weight of the compound (octosulphur), measured in grams per mole.

If [tex]m_{S_{8}} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{molecules}{mol}[/tex] and [tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex], then:

[tex]n_{molecule} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{molecules}{mol} }{256.52\,\frac{g}{mol} }\right)[/tex]

[tex]n_{molecule} = 1.502\times 10^{23}\,molecules[/tex]

There are [tex]1.502\times 10^{23}[/tex] molecules in the compound.

Answer:

20.76 L OF CO2 WILL BE PRODUCED BY 45 G OF METHANE.

Explanation:

Equation of the reaction:

CH4 + 02 --------> CO2 + 2H20

Molar mass of methane = ( 12+ 1*4) g/mol = 16 g/mol

Calculate the number of moles present in 45 g of methane

1 mole of methane = 16 g / mol of methane

(45 / 16) mole of methane = 45 g of methane

= 2.8125 moles

Using the ideal gas equation:

PV = nRT

P = 1 atm

n = 2.812 moles

T = 90 C

R = 0.082 L atm/ mol C

V = unknown

So we have:

V = nRT / P

V = 2.8125 * 0.082 * 90 / 1

V = 20.756 L

In the production of CO2 by 45 g of methane, 20.756 L of methane was used.

Then, the volume of CO2 produced by this volume will be 20.756 L since 1 mole of methane produces 1 mole of CO2.

In other words;

1 mole of CH4 = 1 mole of CO2

22.4 dm3 of CH4 = 22.4 dm3 of CO2

20.76 DM3 = 20.76 dm3

The volume of CO2 produced will therefore be 20.76 L

Answer:

The answer to the question is explained below

Explanation:

A chemical is any substance or an element that can occur naturally or can be created artificially. Chemicals are found in many places like the soil, water, air. They can be found solely as an element without being combined with other elements, and they can also be found as a mixture in compounds.

Exposure to chemicals can be made possible through direct contact with the eye, broken skin. It can also be possible through Inhalation of gases, also through the mouth.

Long-term effects occur when an individual has been exposed to harmful chemicals over a long period of time, with the effect often fatal. Long-term exposure to chemicals include:

1. The weakening of the immune system

2. can cause cancer. For example, Carcinogens that cause cancer in humans, are gotten from exposures to Carbon Tetrachloride, Chloroform.

3. It can cause brain damage

4. It can lead to reproductive disorders

5. It can lead to eye damage, skin problems, and respiratory problems

Short-term effects occur when an individual has been exposed to harmful chemicals accidentally, or within a short period of time. As such, depending on the type of chemical, the amount the individual is exposed to, the effect is usually less fatal and can be addressed. Short-term exposure to chemicals include:

1. Skin or eye irritation

2. Headache

3. Nausea

4. Cough

5. Dizziness

6. Physical injuries

Answer: I wanna say D because pangea was tectonic plates that moved and reshaped the earth

Explanation:

I hope that helps

Answer

D on edge

Explanation:

Answer:

I believe its the 4th one. He goes to give Romeo the message but before he is able to, Balthasar tells Romeo that Juliet is dead. Friar John just wasn't there in time.

Answer:

D) he fails to give Romeo an important letter

Explanation:

i took the test. edge 2020

Answer:

2 moles

Explanation:

Answer:B. A liquid changes to a solid.

Explanation:

A Liquid changes to solid when pressure

increases from 1 atm to 10 atm at -40°C

So, given at -40°C

CO2 will be in liquid state and as per the concept explained above by increasing the pressure on liquid we get the solid state

Thus , With CO2 a liquid phase change to a solid

phase when pressure increases 1 atm to 10atm at -40°C

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Answer:

Ramsey and Marshall method.

Explanation:

The specific latent heat of vapourization of a liquid is measured by a modification of the method of Ramsey and Marshall in the year 1896.

Answer:

d.

Explanation:

The Formation of these mountains will be caused by

Options B, C, and D is correct.

Generally, a mountain is simply defined as a body that rises dramatically above its surroundings and is distinguished by steep slopes.

In conclusion, Mountains are formed from the formation of rocks over years in an Environment.

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Answer:

Molarity of the glucose solution = 2.72 mol/L

Explanation:

Molality of a solution is defined as the number of moles of solute per kilogram of solvent.

Therefore , a 2.27 molal solution of glucose contains 2.27 moles of glucose in 1 Kg of solvent

Density of solution = 1.20 g/mL

The volume occupied by 1 Kg or 1000 g solution = mass/density

Volume of 1000 g solution = 1000 g/1.20 g/ml = 833.3 mL

Number of moles of glucose present in the solution = 2.27 moles

Molarity = number of moles / volume(L)

volume of solution in litres = 883.3/1000 = 0.8333 L

Molarity = 2.27 moles /0.8333 l = 2.72 mol/L

Therefore, molarity of the glucose solution = 2.72 mol/L

The molarity of the glucose in the solution has been 2.72 mol/L.

Molality can be defined as the moles of the solute per kg of solvent.

The molality of glucose solution = 2.27 m

2.27 moles of glucose in 1000 grams of water.

Density has been the mass per unit volume. The density can be expressed as:

Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]

The density of the given glucose solution = 1.20 g/ml

The volume of 1000 grams of water has been:

Volume = [tex]\rm \dfrac{Mass}{Density}[/tex]

Volume of 1000 grams water = [tex]\rm \dfrac{1000\;g}{1.20\;g/ml}[/tex]

Volume of 1000 g water = 833.3 ml

The molarity can be defined as the mass of solute per liter of the solution.

Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{Volume\;(ml)}[/tex] ......(i)

The moles of glucose in the 833.3 ml solution have been 2.27 mol.

Substituting the values in equation (i):

Molarity = 2.27 mol [tex]\rm \times\;\dfrac{1000}{833.3\;ml}[/tex]

Molarity = 2.72 mol/L.

The molarity of the glucose in the solution has been 2.72 mol/L.

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Answer:

the answer is Energy will be exchanged, but matter will not be exchanged.

this because that in a closed system energy is able to be transfered but matter cant.

hope this helps

Answer:

b

Explanation:

none

Answer:

mass = 0.00000043189g

Answer:

Magnesium oxide = MgO

Iron = Fe

Iron (III) Oxide = Fe₂O₃

Magnesium = Mg

Skeleton equation = MgO + Fe ⇒ Fe₂O₃ + Mg

Answer:

Temperature is not a chemical change because when a substance changes in temperature, its chemical makeup is not changing.

Answer:

2.01 A

Explanation:

Para esta pregunta debemos empezar por la semi-reaccion del plomo:

[tex]Pb^+^2~_(_a_q_)~+~2e^-~->~Pb_(_s_)[/tex]

Se intercambian dos electrones en la semi-reacción del plomo. Si tenemos en cuenta la ecuación:

[tex]n=\frac{I*t}{z*F}[/tex]

Donde:

n= Moles depositados

I= Intensidad de corriente (en Amperios)

z= Numero de electrones intercambiados

F= Constante de faraday = 96484 C/mol

t=tiempo (en segundos)

Que conocemos de esta ecuación?

Los moles (se pueden calcular a partir de la masa atómica del plomo, 207.2 g/mol)

[tex]2.6~g~Pb\frac{1~mol~Pb}{207.2~g~Pb}=0.0125~mol~Pb[/tex]

El tiempo (hay que convertirlo a segundos):

[tex]20~min\frac{60~s}{1~min}=1200~s[/tex]

Z (Numero de electrones)

De acuerdo a la semi-reacción son intercambiados 2 electrones.

Por lo tanto podemos resolver para "I":

[tex]I=\frac{n*z*F}{t}=\frac{0.0125~mol*2*96484\frac{C}{mol}}{1200~s}[/tex]

[tex]I~=~2.01~\frac{C}{s}=2.01~A[/tex]

Espero que sea de ayuda!

Answer:

267.14 iron oxide.

Explanation:

Given that

[tex]Fe_2O_3+3CO = 2Fe+3CO_2[/tex]

We know that molecular mass of iron-oxide = 160 g/mole.

We know that molecular mass of iron = 56 g/mole.

From the above reaction we can say that

1 mole of iron -oxide produce 2 mole of iron

160 gm of iron oxide produce 112 gm of iron

So

1 gm of iron required [tex]\dfrac{160}{112}=1.42 gm[/tex] of iron oxide

Therefore

187 gm of iron required [tex]1.42\times = 187 = 267.14\ gm[/tex] of iron oxide.

Therefore 187 gm of iron required 267.14 iron oxide.

Answer: 267.14

Explanation:

Answer:

Chemical potential energy is the energy stored in the chemical bonds of a substance.

Explanation:

Answer:

i think it will "Equal to 75 Kg"

Explanation:

object/person remains same, his mass is somewhere, so it would remain same everywhere. Only Weight of a person changes with gravity

hope i helped

-lvr

Answer:

Carbon has 4 electrons in its outermost shell. ... Therefore, carbon completes its octet by sharing its 4 electrons with other carbon atoms or with atoms of other elements and forms covalent bond. It forms strong covalent bonds because of its small size.

Explanation:

The correct answer is C. Climate change

Explanation:

Long-term environmental changes occur as major events affect the environment and ecosystems indefinitely. These events differ from short-term environmental changes because the effect of short-term environmental changes is mainly temporary. Also, long-term changes are usually gradual.

Climate change is an example of long-term environmental changes because this implies indefinite and major changes in weather patterns and ecosystems. For example, it is believed climate change will decrease the amount of ice in Earth, change sea level, and lead to the extinction of dozens of species. This does not occur with events such as el niño or a small asteroid impact that affect the environment for a short time and do not imply major changes.

Answer:

it is c) climate change

Explanation:

i just took the quiz

hope this helps!!!   :D