. Elements in the Periodic Table are arranged according to increasing numbers of _____________, which is called the ___________ ______________ on an element key.

Answer:

At 10 ∘C , the solubility of potassium chloride is measured to be 31.2⋅g per 100⋅g of water.

Explanation:

Answer:

B. The [H1+] >[OH1-] and the solution is acidic

Answer:

B

Explanation:

Answer:

option D

Explanation:

Increasing the temperature increases the yield of ammonia and speeds up the reaction as chemical reaction is affected by temperature.

Answer:

increasing the temperature decreases the yield of ammonia but speeds up the reaction

Explanation:

first pressure have no effect in chemical reaction

Answer:

The correct answer is -

(a) spontaneous;

(b) nonspontaneous;

(c) spontaneous;

(d) nonspontaneous;

(e) spontaneous;

(f) spontaneous

Explanation:

(a) Liquid water freezing at a temperature below its freezing point.

in this reaction, there is no requirement of external energy or force to make it possible due to the fact that the temperature of the environment is less than the freezing point of water. So, the water will spontaneously freeze.

(b) Liquid water freezing at a temperature above its freezing point. the melting of ice takes place with the increase or absorbing the heat which is a nonspontaneous,

(c) The combustion of gasoline produces gas molecules, and release energy which means it is an exothermic reaction, the combustion of gasoline is a spontaneous reaction.

(d) A ball is thrown into the air is not a natural process and it requires force or energy to be complete and works against gravity, Therefore, it is a nonspontaneous reaction.

(e) A raindrop falling to the ground is a naturally occurring reaction without any external force and in the direction of gravity, thus it is a spontaneous reaction.

(f) Iron rusting in a moist atmosphere is a spontaneous reaction as it does not require energy to occur and it naturally takes place. It is a redox reaction.

Answer:

True

Explanation:

In ionic compounds, oxygen borrows electrons. In covalent compounds, oxygen shares electrons.

Answer:

1. 2.41 × 1023 formula units

2. 122 L

3. 7.81 L

Explanation:

1. Equation of the reaction: 2 Na(NO3) + Ca(CO3) ---> Na2(CO3) + Ca(NO3)2

Mole ratio of NaNO3 to CaCO3 = 2 : 1

Moles of CaCO3 = mass/molar mass

Mass of CaCO3 = 20 g; molar mass of CaCO3 = 100 g

Moles of CaCO3 = 20 g/100 g/mol = 0.2 moles

Moles of NaNO3 = 2 × 0.2 moles = 0.4 moles

1 Mole of NaNO3 = 6.02 × 10²³ formula units

0.4 moles of NaNO3 = 0.4 × 6.02 × 10²³ = 2.41 × 1023 formula units

2. Equation of reaction : 2 H2O ----> 2 H2 + O2

Mole ratio of oxygen to water = 1 : 2

At STP contains 6.02 × 10²³ molecules = 1 mole of water

6.58 × 10²⁴ molecules = 6.58 × 10²⁴ molecules × 1 mole of water/ 6.02 × 10²³ molecules = 10.93 moles of water

Moles of oxygen gas produced = 10.93÷2 = 5.465 moles of oxygen gas

At STP, 1 mole of oxygen gas = 22.4 L

5.465 moles of oxygen gas = 5.465 moles × 22.4 L/1 mole = 122 L

3.Equation of reaction: 6 K + N2 ----> 2 K3N

Mole ratio of Nitrogen gas and potassium = 6 : 1

Moles potassium = mass/ molar mass

Mass of potassium = 90.0 g, molar mass of potassium = 39.0 g/mol

Moles of potassium = 90.0 g / 39.0 g/mol = 2.3077moles

Moles of Nitrogen gas = 2.3077 moles / 6 = 0.3846 moles

At STP, 1 mole of nitrogen gas = 22.4 L

0.3486 moles of oxygen gas = 0.3486 moles × 22.4 L/1 mole = 7.81 L

1. Volume of oxygen 2.41 × 1023   units

2. Nitrogen gas 122 L

3. 7.81 L

Equation of the reaction:

[tex]\rm 2Na(No_3)+Ca(Co_3)---- > Na_2(Co_3)+Ca(No_3)_2[/tex]

[tex]NaNo_3\ and \ CaCo_3=\dfrac{2}{1}[/tex]

[tex]\rm Moles \ of \ CaCo_3=\dfrac{Mass}{Molar\ Mass}[/tex]

Mass of CaCO3 = 20 g; molar mass of CaCO3 = 100 g

[tex]\rm \ Moles \ of \ CaCo_3=\dfrac{20}{100} =0.2[/tex]

[tex]Moles \ of \ NaNo_3=2\times 0.2=0.4\ moles[/tex]

[tex]1\ mole\ of \ NaNo_3=6.02\times10^{23}[/tex]

0.4 moles of NaNO3 = [tex]0.4\times 6.02\times 10^{23}=2.41\times 10^{23}[/tex]  

2. Equation of reaction :[tex]2H_2o---- > 2H_2+o_2[/tex]  

The mole ratio of oxygen to water =  [tex]\dfrac{2}{1}[/tex]

At STP contains

 [tex]\dfrac{6.02\times 10^{24}\times 1 \ mole \ of \ water}{6.02\times 10^{23}} =10.93\ moles \ of \ water[/tex]

Moles of oxygen gas produced =

[tex]\dfrac{10.93}{2} =5.465\ Moles \ of \ oxygen \ gas[/tex]

At STP, 1 mole of oxygen gas = 22.4 L

5.465 moles of oxygen gas =    [tex]5.465\times 22.4=122\ L[/tex]  

3. Equation of reaction:

[tex]6k+N_2---- > 2K_3N[/tex]6

The mole ratio of Nitrogen gas and potassium =   [tex]\dfrac{6}{1}[/tex]

[tex]Moles\ of \ potassium = \dfrac{Mass}{Molar\ Mass}[/tex]

Mass of potassium = 90.0 g,

molar mass of potassium = 39.0 g/mol

[tex]Moles\ of \ potassium = \dfrac{90}{39}=2.3077\ moles[/tex]

[tex]Moles\ of \ Nitrogen = \dfrac{ 2.3077}{6}=0.3846\ moles[/tex]

At STP, 1 mole of nitrogen gas = 22.4 L

0.3486 moles of oxygen gas =

[tex]0.3486\times 22.4=7.81\ L[/tex]

Thus

1. Volume of oxygen 2.41 × 1023   units

2. Nitrogen gas 122 L

3. 7.81 L

To know more about Stoichiometry follow

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Answer:

[tex]H^++NH_3\rightleftharpoons NH_4^+[/tex]

Explanation:

Hello there!

In this case, since the buffer is not given, we assume it is based off ammonia, it means the ammonia-ammonium buffer, whereas the ammonia is the weak base and the ammonium ion stands for the conjugate acid. In such a way, when adding HI to the solution, the base of the buffer, NH3, reacts with the former to promote the following chemical reaction:

[tex]H^++NH_3\rightleftharpoons NH_4^+[/tex]

Because the HI is totally ionized in solution so the iodide ion becomes an spectator one.

Best regards!

Answer:

the above answer is wrong

Explanation:

its really not but the mastering chemistry says it is

Answer:

option first is right answer

Answer:

Atoms

Explanation:

Atoms are the smallest thing meaning they form molecules which are made of atoms.

Also, your question is not 93 points but whatever lol.

Answer:

Atoms

Explanation:

I took the test

Answer:

The answer is 200mL each amount have the same mass

Explanation:

100mL +100ML= 200mL mass in each container

Answer:

200ml

Explanation:

Answer:

probably the sun

.

Explanation:

because the sun's heat result to evaporation

Answer:

a) 2,4-dinitrobenzoic acid: the most acidic compound, p-nitrobenzoic acid: _______, p-bromobenzoic acid: the least acidic compound

b) oxalic acid: the most acidic compound, acetic acid: the least acidic compound, formic acid: _______.

c) p-cyanobenzoic acid: the least acidic compound, benzoic acid: the most acidic compound, p-aminobenzoic acid: _______.

Explanation:

a) 2,4-dinitrobenzoic acid is the most acidic compound of this set because it has two strong electronegative substituents (nitrogen dioxide) which increases the acidity of benzoic acid, while p-bromobenzoic acid is the least acidic compound because bromine is a weaker electron withdrawing group than nitrogen dioxide.

b) The presence of 2 -COOH group makes Oxalic acid the most acidic compound of this set, while decrease in acidity of carboxylic acid due to the presence of methyl group on carbon of -COOH group makes acetic acid the least acidic compound of this set.  

(c) Benzoic acid has a higher acid dissociation constant value (4.45 Ka) therefor it is the most acidic compound of this set, while p-cyanobenzoic acid is the least acidic compound of this set as it has the least acid dissociation constant value (16 Ka).

Answer:

Percentage yield = 61.7%

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated:

2AgNO₃ + Cu —> Cu(NO₃)₂ + 2Ag

Next, we shall determine the mass of AgNO₃ that reacted and the mass of Ag produced from the balanced equation. This is illustrated below:

Molar mass of AgNO₃ = 108 + 14 + (16×3)

= 108 + 14 + 48

= 170 g/mol

Mass of AgNO₃ from the balanced equation = 2 × 170 = 340 g

Molar mass of Ag = 108 g/mol

Mass of Ag from the balanced equation = 2 × 108 = 216 g

SUMMARY:

From the balanced equation above,

340 g of AgNO₃ reacted to produce 216 g of Ag.

Next, we shall determine the theoretical yield of Ag. This can be obtained as follow:

From the balanced equation above,

340 g of AgNO₃ reacted to produce 216 g of Ag.

Therefore, 51 g of AgNO₃ will react to produce = (51 × 216)/340 = 32.4 g of Ag.

Thus, the theoretical yield of Ag is 32.4 g.

Finally, we shall determine the percentage yield of Ag. This can be obtained as follow:

Actual yield = 20 g

Theoretical yield = 32.4 g

Percentage yield =?

Percentage yield = Actual yield /Theoretical yield × 100

Percentage yield = 20 / 32.4 × 100

Percentage yield = 61.7%

0.52 molar is the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water.

The term molarity is defined as the number of moles of solutes are dissolved in per litre of solution. It is represented by the symbol "M". The unit of molarity is molar(M).

To calculate the molarity of a solution, divide the moles of solute by the volume of the solution expressed in liters.

The formula of molarity = a number of moles of solutes /  litre of solution

Given:

Number of moles = 0.257 moles

Volume = 490ml = 0.49 litre

Molarity = ?

According to the definition of molarity,

Molarity = Number of moles of solute / litre of solution

Molarity =  0.257 moles / 0.49 litre

Molarity = 0.52 molar

Thus, the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water is 0.52 molar.

To learn more about the molarity, follow the link;

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Answer:

Option B, HCO3 1-

Explanation:

The valence of Sodium ion is +1 and the valence of HCO3 is -1. Thus, sodium ion has an extra electron to be donated to complete its outer shell  while HCO3 needs an electron to complete its outer shell

Hence Na will combine with HCO3 to form NaHCO3

Option B is correct

The polyatomic ion which will form an ionic compound with a single sodium ion is; HCO3 ¹-

In chemical bonding between ions;

The major criteria is a balance of charges within the compound formed.

As such, all polyatomic ions in the option are di-ionic except for HCO3 1- which can perfectly form an ionic compound with 1 single sodium ion.

Read more on ionic compounds:

https://brainly.com/question/13539062

Answer:

1.The reaction that opposes the change

Explanation:

Consider the reaction;

A + B ⇄ C + D

If a constraint such as a change in temperature, pressure or volume is imposed on this chemical system in dynamic equilibrium, the equilibrium position will shift so as to annul the constraint.

This shift in the equilibrium position will favour either the forward or reverse reaction depending on the type of constraint imposed on the system.

Hence, If a chemical system is at equilibrium, any change in the system will always result in an increase of the reaction that opposes the change.

Answer:

n = 0.045 mol.

Explanation:

Hello there!

In this case, according to the given problem, we can firstly set up the ideal gas equation as shown below:

[tex]PV=nRT[/tex]

Thus, as we are asked to calculate the moles, we proceed as follows:

[tex]n=\frac{PV}{RT}[/tex]

Therefore, we plug in the given data to obtain:

[tex]n=\frac{760mmHg*\frac{1atm}{760mmHg}*1.0L}{0.08206\frac{atm*L}{mol*K}*273K} \\\\n=0.045mol[/tex]

Best regards!

Answer:

General Characteristics of Acids:

Sour taste (though you should never use this characteristic to identify an acid in the lab) Reacts with a metal to form hydrogen gas. Increases the H+ concentration in water. Donates H+ ions. Turns blue litmus indicator red.

Answer - 1.50 M Na

Explanation -

3.00 moles of Na over 2.00 L of water.

3.00/2.00 = 1.50 M Na

I cannot be entirely sure. But it's an educated guess.

.500 mol ( 6.02x10^23 molecules/1 mol) = 3.01x10^23        

Answer:

C

Explanation:

Answer: C. Longitudinal

Explanation: A P 3 X

Answer:

a. 87.8g/mol is the molar mass of the acid.

b. The answer is in the explanation.

Explanation:

To solve this question we must find the moles of the monoprotic acid using the reaction with NaOH (1mole of monoprotic acid reacts with 1 mole of NaOH). With the moles and the mass of the unknown we can find the molar mass.

Moles of NaOH added:

0.04121L * (0.150moles / L) = 6.1815x10⁻³ moles NaOH = Moles monoprotic acid

Molar mass is:

0.543g / 6.1815x10⁻³ moles = 87.8g/mol is the molar mass of the acid

b. I can't see the image you are giving because has a low resolution. But the identity of the acid can be obtained because the acid:

Has the same molar mass.

Is a monoprotic acid.

(a) The molecular mass of the unknown monoprotic acid will be 87.84 g/moles.

(b) The acid can be butyric acid, as it is a monoprotic and have mass near about 87.84 g/mol.

(a) The endpoint by the addition of NaOH has been reached when the monoprotic acid has been completely utilized. Since the NaOH has been monobasic. The moles of NaOH will be equal to the moles of acid.

Moles of NaOH = moles of acid

The molarity of NaOH = 0.15 M

Volume of NaOH = 41.21 ml

Molarity = [tex]\rm \dfrac{moles}{volume\;(L)}[/tex]

Moles = molarity [tex]\times[/tex] volume (L)

Moles of NaOH = 0.15 [tex]\times[/tex] 0.04121 L

Moles of NaOH = 0.00618 moles

Moles of NaOH = moles of acid

moles of acid = 0.00618 moles.

Mass of acid dissolved = 0.543 grams

Molecular weight of acid = [tex]\rm \dfrac{weight}{moles}[/tex]

Molecular weight of acid = [tex]\rm \dfrac{0.543}{0.006815}[/tex]

Molecular weight of acid = 87.84 g/moles.

(b) The acid with the molecular mass of 87.84 g/mol with being the monoprotic acid can be butyric acid. The butyric acid has a molecular weight of 88 g/mol.

For more information about monoprotic acid, refer to the link:

https://brainly.com/question/22497931

Answer:

Explanation:

The biocapacity or biological capacity of an ecosystem is an estimate of its production of certain biological materials such as natural resources, and its absorption and filtering of other materials such as carbon dioxide from the atmosphere.

Answer:

181.403 g/mol is the answer as it is Zinc chromate

Explanation:

Answer:

181.403 g/mol

Explanation:

Molar mass of ZnCrO4 = 181.3737 g/mol. This compound is also known as Zinc Chromate. Convert grams ZnCrO4 to moles or moles ZnCrO4 to grams. 65.38 + 51.9961 + 15.9994*4

Answer:

P₂ ≅ 100 atm (1 sig. fig. based on the given value of P₁ = 90 atm)

Explanation:

Given:

P₁ = 90 atm                    P₂ = ?

V₁ = 18 Liters(L)              L₂ = 12 Liters(L)      

=> decrease volume => increase pressure

=> volume ratio that will increase 90 atm is (18L/12L)                                                                  

T₁ = 272 Kelvin(K)          T₂ = 274 Kelvin(K)

=>  increase temperature => increase pressure

=> temperature ratio that will increase 90 atm is (274K/272K)

n₁ = moles = constant    n₂ = n₁ = constant

P₂ = 90 atm x (18L/12L) x (274K/272K) = 135.9926471 atm (calculator)

By rule of sig. figs., the final answer should be rounded to an accuracy equal to the 'measured' data value having the least number of sig. figs. This means P₂ ≅ 100 atm based on the given value of P₁ = 90 atm.

Answer:

As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.

Answer:

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____________________

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# ꧁❣ RainbowSalt2²2² ࿐

Answer:

Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.

Explanation:

Answer:

Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process. If you are considering the colour change only - refer to it as bleaching. If you are considering the reaction mechanism and how the chemicals which provide the colour are changed, then refer to it as oxidation.

Explanation: