In 2013 the world consumption of oil was estimated at 3.3 ´ 1010 barrels per year. The world reserves of oil in 2013 were estimated as 1.324 ´ 1012 barrels. Estimate how many years the current reserves of oil will last assuming that consumption remains at the 2013 rate.

Answer:

The evidence goes against A. Expanding Earth and B. Contracting Earth

Answer:

When reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. When a product is added, the equilibrium moves in order for reactants to reduce the stress.

Explanation:

:)

It should be noted that when a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product.

It should be noted that a reactant simply means a substance that takes part in a chemical reaction to form products.

When a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. Also, when a product is added, the equilibrium moves in order for reactants to reduce the stress. This is vital for the reaction.

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Answer:

The lattice energy increases as cations get smaller, as shown by LiF and KF.

Explanation:

Lattice energy is the change in internal energy that accompanies the formation of one mole of the solid from its constituent gas phase ions at 0 K. In calculating the lattice energy, we assume an electrostatic model where the ions are regarded as point charges.

The size of the ions determines the magnitude of the lattice energy. If the anion is the same, then the magnitude of the lattice energy depends on the the size of the cation, the smaller the cation the greater the lattice energy.

Since Li^+ is smaller than K^+, it is expected that LiF will have a greater lattice energy than KF, hence the answer.

The statement about crystal lattice energy that is supported by the information in the table is A. The lattice energy increases as cations get smaller, as shown by LiF and KF.

It should be noted that lattice energy simply means the change in internal energy that occurs after the formation of one mole of the solid from its constituent gas phase ions.

The magnitude of the lattice energy is determined by the size of the ions. From the table, the lattice energy increases as cations get smaller, as shown by LiF and KF.

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Answer:

12%

Explanation:

Answer:

it is 90.0

Explanation:

Hey there! :)

Answer:

C. Number of outer shell electrons.

Explanation:

Groups consist of the vertical columns of the periodic table, such as 1A, 2A, etc. (Not including transition metal groups) which depict the number of valence electrons, or the number of electrons in the atom's outer shell.

For example, Oxygen, which is in group 6A, contains 6 valence (outer shell) electrons.

Answer:

number of outer shell electrons.

Explanation:

Answer:

D. 1:1

Explanation:

For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).

So, the mole ratio of chlorine to calcium chloride is 1:1.

Hope this helps. :)

The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.

Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.

Given chemical reaction is:

Ca + Cl₂ → CaCl₂

From the stoichiometry of the given reaction it is clear that,

1 mole of chlorine = reacts with 1 mole of calcium chloride

So, mole ratio = Chlorine / calcium chloride = 1:1

Hence required mole ratio is 1:1.

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Answer:

Nitrogen

Explanation:

Each arrow counts as one electron so in total you have 7 arrows = 7 electron. From periodic table, we know Nitrogen has 7 electrons so the element here is nitrogen.

Answer:

Nitrogen

Explanation:

1 arrow is 1 electron. In total you have 7 arrows which means you have 7 electron. Nitrogen has 7 electrons.

Answer:

2H2O2 → 2H2O + O2

Explanation:

Answer:

The answer is Conduction.

Explanation:

Conduction occurs when particles collide and vibrate each other.

Answer:

Conduction

Explanation:

When particles of matter collide with each other, they transfer heat by direct contact which is called conduction.

Answer:

Ammonia is gas.

Explanation:

If not moistened, there will be no change in color of litmus paper. That is why littmus paper is being moistened before testing the pH of a gas.

Hope it helps.

Answer:

52. The alcohol USED => methanol, CH3OH

The carboxylic acid USED => propanoic acid, CH3CH2COOH.

53. The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Explanation:

52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:

CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O

The alcohol used: methanol, CH3OH

The carboxylic acid used: propanoic acid, CH3CH2COOH.

53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react

Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:

HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O

The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Answer:

A. Pascals

Explanation:

A unit Pascal is an SI unit used for internal pressure.

Centimeters cubed is volume.

Liters is measurement.

Kelvin is temperature.

Answer: A. Pascals

Explanation: Founders Educere answer

Answer:

weak acids have a pH of less than 2

Answer: D.  It is the currently accepted atomic model.

Explanation:

It is the mordern atomic model, also known as the Electron Cloud Model. Indicating that the nucleus of an atom is surrounded by a cloud of electrons.

Answer:

Explanation:

d

Answer:

We can seprate oil and water by the process of seprating funnel

Answer:

A. Argon

Explanation:

Argon is a nonmetal. It is a noble gas with an atomic number of 18.

Based on the periodic table of chemical elements, the atom which is not a metal is the atom with an atomic number (number of protons) of 18.

Given the following data:

An chemical element can be defined as a pure substance which is made up of atoms that are having the same atomic number (number of protons) in its atomic nucleus.

This ultimately implies that, an atomic number is equal to the number of protons in the nucleus of an atom of a chemical element.

In Chemistry, the following chemical elements have this atomic number:

Note: Both group 1 and 2 chemical elements are metals.

However, an atom with an atomic number of 18 is in group 8 of the periodic table and as such isn't a metal but a noble gas.

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Answer:

A I think

Explanation:

Because plasma have ions and B is neutralized with two ions

A chemical reaction has the equation 2NaCl(aq) + F₂ → 2NaF(s) + Cl₂ (g). The reaction type occur between NaCl and F₂ is Single displacement.

Hence, Option (B) is correct answer.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.

Now lets check all options one by one

Option (A): Double displacement

A double displacement is a chemical reaction in which elements are exchange between the two compounds.  In the given reaction F₂ is not a compound. so this reaction cannot occur

Hence, option (A) is incorrect.

Option (B): Single displacement

A Single displacement reaction is a chemical reaction in which one element replaces the another element in a compound.

In the given reaction F₂ element replaces with the element Na in a compound NaCl. So this reaction occur.

Hence, option (B) is correct.

Option (C): Synthesis

A synthesis reaction is a chemical reaction where two or more substances react to produce a new compound.

In the given reaction two products are formed NaF which is a compound and Cl₂ which is element. So this reaction cannot occur.

Hence, option (C) is incorrect.

Option (D): Decomposition

A decomposition reaction is a chemical reaction in which one reactant breaks down to form a two or more products.

In the given reaction two reactants are given NaCl and F₂. So this reaction cannot occur.

Hence, option (D) is incorrect.

Thus, from above conclusion we can say that The reaction occurs between NaCl and F₂ is single displacement reaction.

Hence, Option (B) is correct answer.

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Answer:

Option C. 1105.6 K

Explanation:

The following data were obtained from the question:

CaCO3 —> CaO + CO2

Enthalpy (H) data:

CaCO3 = -1207 kJ/mol

CaO = -635 kJ/mol

CO2 = -394 kJ/mol

Entropy (S) data:

CaCO3 = +93 J/K mol

CaO = +40 J/K mol

CO2 = +214 J/K mol

Temperature (T) =..?

Next, we shall determine the enthalphy change (ΔH).

This is illustrated:

CaCO3 —> CaO + CO2

CaCO3 = -1207 kJ/mol

CaO = -635 kJ/mol

CO2 = -394 kJ/mol

Heat of product (Hp) = -635 + -394 =

- 1029 KJ

Heat of reactant (Hr) = -1207 kJ/mol

Enthalphy change (ΔH) = Hp – Hr

Enthalphy change (ΔH) = - 1029 –(-1207)

Enthalphy change (ΔH) = 178 KJ/mol

Next, we shall determine the change in entropy (ΔS).

This is illustrated below:

CaCO3 —> CaO + CO2

Entropy (S) data:

CaCO3 = +93 J/K mol

CaO = +40 J/K mol

CO2 = +214 J/K mol

Entropy of product (Sp) = 40 + 214 =

+254 J/Kmol

Entropy of reactant (Sr) = +93 J/Kmol

Change in entropy (ΔS) = Sp – Sr

Change in entropy (ΔS) = 254 – 93

Change in entropy (ΔS) = 161 J/Kmol

Finally, we shall determine the temperature (T) at which the reaction was feasible.

This is illustrated below:

Enthalphy change (ΔH) = 178 KJ/mol = 178000 J/mol

Change in entropy (ΔS) = 161 J/Kmol

Temperature (T) =..?

ΔS = ΔH/T

161 = 178000/T

Cross multiply

161 x T = 178000

Divide both side by 161

T = 178000/161

T = 1105.6 K

Therefore, the temperature at which the reaction was feasible is 1105.6 K

Answer : The correct option is, (C) 26.5 L

Explanation :

The combustion of ethylene is:

[tex]C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(g)[/tex]

First we have to calculate the number of moles of water vapor.

From the balanced chemical reaction, we conclude that:

As, 1 mole of [tex]C_2H_4[/tex] react to give 2 moles of [tex]H_2O[/tex]

So, 0.535 mole of [tex]C_2H_4[/tex] react to give [tex]2\times 0.535=1.07mol[/tex] moles of [tex]H_2O[/tex]

Now we have to calculate the volume of water vapor.

Using ideal gas equation:

[tex]PV=nRT\\\\V=\frac{nRT}{P}[/tex]

where,

P = pressure of gas = 100 kPa

V = volume of gas = ?

T = temperature of gas = [tex]25^oC=273+25=298K[/tex]

R = gas constant = 8.314 L.kPa/K.mol

n = number of moles of gas = 1.07 mol

Now put all the given values in the above formula, we get:

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{1.07 mol\times 8.314 L.kPa/K.mol\times 298K}{100kPa}[/tex]

[tex]V=26.5L[/tex]

Therefore, the volume of water vapor is, 26.5 L.

Answer:

Specific heat is a physicle property.

Explanation:

Hello! :)

________ ☆ ☆__________________________

Answer:

physical property....

Explanation:

Here is a example of specific heat... WATER.

I attached a picture if you still didn’t understand.

So the answer would be....

ANSWER:PHYSICAL PROPERTY

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Answer:

Option A, Tectonic plates above the currents move toward each other.

Option C, One plate will submerge beneath another plate.

Option D, A convergent boundary is formed at the site of the collision.

Explanation:

The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.

Answer:

- Tectonic plates above the currents move toward each other;

- One plate will submerge beneath another plate;

- A convergent boundary is formed at the site of the collision;

The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.

Answer:The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elem

Explanation:

Answer: In their bonded, solid states, molecules like salt don't conduct electricity. But when they're dissociated in a solution or through melting, they can carry a current. This is because electrons can't move freely through water (in the same way they do in a conductive wire), but ions can move freely

Explanation:

Answer:

Cl₂ > Br₂ > I₂

Explanation:

An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.

Oxidizing ability decreases down the group.

Therefore Cl₂ > Br₂ > I₂

Answer:

Option (d) The milk is 10000 times more basic than the lemon juice.

Explanation:

The following data were obtained from the question:

pH of milk = 6

pH of lemon juice = 2

To know which option is correct, let us find the ratio of the concentration of Hydrogen ion, H+ of the the milk to that of the lemon.

This is illustrated below:

For milk:

pH = 6

Hydrogen ion concentration, [H+] =?

pH = –Log [H+]

6 = –Log [H+]

– 6 = Log [H+]

[H+] = Antilog (– 6)

[H+] = 1x10^-6 M

For lemon juice:

This is illustrated below

pH = 2

Hydrogen ion concentration, [H+] =?

pH = –Log [H+]

2 = –Log [H+]

– 2 = Log [H+]

[H+] = Antilog (– 2)

[H+] = 0.01 M

Next we shall determine the ratio of the concentration of Hydrogen ion, [H+] of milk to that of the lemon juice. This is illustrated below:

[H+] of milk : [H+] of lemon juice

[H+] of milk / [H+] of lemon juice

=> 1x10^-6 / 0.01

=> 1 / 10000

[H+] of milk : [H+] of lemon juice

=> 1 : 10000

Note: the higher the hydrogen ion concentration, [H+], the more acidic the substance will be and the lesser the hydrogen ion concentration, [H+], the more basic the substance will be.

From the above illustration, we can see that the milk is 10000 times more basic than the lemon juice..

Answer:

d

Explanation:

Answer:

Fluorine will not give up electrons when forming a chemical bond because since it is so electronegative, it pulls electrons from other elements closer to it. Fluorine also has seven valence electrons and needs just one electron to fill its outer shell and gain stability.

Hope this helps. :)

The information regarding the element fluorine is explained below:

The following information should be considered:

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