i need help with chemistry equation

When the pH of a solution decreases, hydrogen ion concentration increases

The overall concentration of hydrogen ion is inversely related to its pH and can be measured on the pH on the pH scale which is from 1 to 14 and therefore the more hydrogen ions present, the lower the pH conversely the fewer hydrogen ions the higher the pH as the concentration of hydrogen ion is logarithmically inversely proportional to pH and pH of solution is decreased then hydrogen ion concentration will increase by the power of 10

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Taking into account the reaction stoichiometry, 121.89 grams of AgI are produced from 43.3 g of calcium iodide.

In first place, the balanced reaction is:

CaI₂ + 2 AgNO₃ → 2 AgI + Ca(NO₃)₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 166.8 grams of CaI₂ form 469.54 grams of AgI, 43.3 grams of CaI₂ form how much mass of AgI?

mass of AgI= (43.3 grams of CaI₂×469.54 grams of AgI)÷ 166.8 grams of CaI₂

mass of AgI= 121.89 grams

Finally, 43.3 grams of CaI₂ form 121.89 grams of AgI.

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In this question, we have the following reaction:

2 Pb + O2 -> 2 PbO

We have to find the percent yield of this reaction, we have:

451.4 grams of Pb

316.9 grams of PbO, this is the actual yield, we will have to find the theoretical yield now

In order to find the theoretical yield, we need to know how many moles of Pb we have in 451.4 grams, the molar mass of Pb is 207.2g/mol

207.2g = 1 mol

451.4 g = x moles

207.2x = 451.4

x = 451.4/207.2

x = 2.18 moles of Pb in 451.4 grams

According to the molar ratio of Pb and PbO, we have the ratio of 2 moles of Pb to form 2 moles of PbO, therefore if we have 2.18 moles of Pb, we will also have 2.18 moles of PbO.

Now we need to find the theoretical mass of PbO, using its molar mass, 223.2g/mol

223.2g = 1 mol

x grams = 2.18 moles

x = 2.18 * 223.2

x = 486.6 grams of PbO is the theoretical yield

Now to find the percent yield, we need to use the following formula:

%yield = (actual yield/theoretical yield)*100

%yield = (316.9/486.6)*100

%yield = 65

The percent yield of this reaction will be 65%

If want to measure the mass of a fly in metrics use a scale or a balance.

The current international standard metric system and the one that is most generally used worldwide is the International System of Units (Système international d'unités, or SI). It is a development of Giorgi's MKSA system, with the meter, kilogram, second, ampere, kelvin, candela, and mole as its fundamental units.

A balance is used to estimate an object's mass for the majority of commonplace objects. The balance compares the target object to a known mass object. Digital scientific balances and beam balances, like a triple beam balance, are examples of several sorts of balances.

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Sulfuric acid is a strong acid, which means it can dissociate completely when dissolve in water. In other words, the reactant H2SO4 is completely soluble in water, otherwise, it wouldn't be a strong acid.

On other hand, the second reactant Ba(OH)2 is soluble in water because it's a strong base, which are bases that completely dissociate when dissolve in water.

Therefore, sulfuric acid (H2SO4) is soluble in water and the barium hydroxide (Ba(OH)2) is also soluble in water.

According to the image, it can be inferred that the students in Florida are in summer when the earth is in position 1.

The seasons are a term that refers to each of the periods of time in which the year is divided, with a duration greater than the months, characterized by the typical behavior of some meteorological variable. They occur cyclically and inverted between one hemisphere and another.

In general, the seasons are divided in this way:

Position 1: June 21 - September 23

Boreal Summer

I invest Austral

Position 2: September 23 - December 21

boreal autumn

southern spring

Position 3: December 21 - March 21

boreal winter

Ausral Summer

Position 4: March 21 - June 21

boreal spring

southern autumn

According to the above, it can be inferred that in position 1 the students from Florida will be in the summer season because Florida is in the boreal hemisphere of the earth (Northern hemisphere).

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Answer:

why alkali metal are called as most reactive elements?

Out of gold and copper, gold metal would have larger mass.

What is molar mass?

The mass of any chemical substance divided by the volume of the material is known as the molar mass of that compound.

Given:  The value of volume is same for both the metals = 45

The value of the volume is the same for both the metals = 45 cm3

By using formula of density i.e = mass/volume

Since the volume is the same

The density is directly proportional to the mass.

From the periodic table,

The mass of gold = 196.9 u

The mass of copper = 63.5 u

Since the volume is the same, we consider only the absolute masses value

Hence, gold is heavier than copper metal

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Answer

the correct answer would be A

Explanation:

They were unable to find class nor individual characteristics.

Anhydrides are binary substances or compounds that are the result of a nonmetal with oxygen.

I leave you 2 steps to make the anhydrides:

1: To make anhydrides, write your nonmetal symbol followed by oxygen.

2: The oxidation numbers must be the same and for this the exchange of oxidation numbers or valence between its non-metallic element and Oxygen is used.

Examples of anhydrides:

1: Chlorous anhydride

[tex]\bold{ \: Cl + O₂ \rightarrow \: Cl₂ O₃}[/tex]

Keep in mind that when it ends in OSO we look for its valence, which in this case would be +3.

2: Iodic anhydride

[tex]\bold{ \: I + O₂ \rightarrow \: I₂ \: O₅}[/tex]

We take into account its symbol that in this would be me and to solve it we must look for its valence that in this case ends in ICO which is already known that its ICO valence is +5.

3: Per bromic anhydride

[tex]\bold{\:Br + O₂ \rightarrow \:Br₂ \:O₇}[/tex]

We take into account its symbol, which in this case would be Br, and to solve it we must find its valence, which in this case ends in ICO, which is already known to have an ICO valence of +7.

The Table of metals and non-metals is attached.

Answer:

40.04g

Explanation:

the water has one molecule of hydrogen and two molecules of oxygen(H20)

(4.02)(2)(32)

Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.

Measured over twenty years methane is eighty times more powerful than carbon dioxide and causes global warming, while nitrous oxide is 280 times more powerful. During the industrial age, carbon dioxide caused about 10 times more warming than nitrous oxide. But laughing gas is stronger. One pound of gas heats the atmosphere about 300 times more than one pound of carbon in 100 years.

Water vapor is the most powerful greenhouse gas in the Earth's atmosphere and plays a unique role among them. The amount of water vapor in the atmosphere is usually not directly changed by human actions. It depends on the air temperature. Compared to other anthropogenic greenhouse gases, carbon dioxide CO2 has the largest relative contribution to the increase in the greenhouse effect.

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Answer:

A: protons + neutrons

Explanation:

protons and neutrons both have the same mass. Their mass is much greater than the mass of an electron so it is deemed negligible

Answer:

Circumference of carbon = 483.56 pm

Circumference of sulphur = 1111.56 pm

Explanation:

The circumference is the length of any great circle, the intersection of the sphere with any plane passing through its centre.

For carbon atom:

Atomic radius = 77 pm

Circumference = 2πr

=2 X 3.14 X 77

=154 X 3.14

Circumference of C = 483.56 pm

For sulphur:

Atomic radius = 177 pm

Circumference = 2πr

=2 X 3.14 X 177 pm

=1111.56 pm

Circumference of sulphur = 1111.56 pm

Hence,

The circumference of Carbon is 483.56 and the circumference of sulphur is 1111.56 pm.

[tex]c \: = 2\pi\:r[/tex]

C = 2(3.14)(77)

C = 6.28 × 77

C = 2(3.14)(103)

C = 6.28 × 103

The calorific capacity of a substance related to the temperature when specific heat of a substance ∆Q changes.

Specific heat is defined as the heat required to raise the temperature of 1 gram of a substance by one degree.

Specific heat = q/(∆T × mass of the substance)

Heat Capacity is defined as the amount of heat required to raise the temperature of the system by one degree.

Units of heat capacity :

The unit of heat capacity are joule/kelvin or joule/Celsius.

Thus, we concluded that the calorific capacity of a substance related to the temperature when specific heat of a substance ∆Q changes.

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The fact that 21 g of A and 21 g of B produce 17 g of C does not obey the law of conservation of mass.

The law of conservation of mass states that the mass of a substance can neither be created nor destroyed.

This law further explains that in a chemical reaction, the amount of reactants must be equal to the amount of products in the reaction.

For example, if a substance A of mass 21g reacts with another substance B of mass 21g, the mass of the product C should be 21g + 21g = 42g in order to align with the law of conservation of mass.

However, according to this question, the product C has a mass of 17g, which shows that the law of conservation of mass is not obeyed.

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The right answer is (KP)-1/2. Option A.

An expression of the equilibrium constant in terms of partial pressure is denoted as Kp. The equilibrium constant Kp is equal to the partial pressure of the product divided by the partial pressure of the reactant, and the partial pressure increases with a force equal to the coefficient of the substance in the equilibrium equation.

Kp is the equilibrium constant used to express equilibrium concentrations at atmospheric pressure and Kc is the equilibrium constant used to express equilibrium concentrations in molar terms. The relationship between Kp and Kc depends on the change in the number of moles of gaseous reactants and products. Kp has exactly the same form as Kc but partial pressure is used instead of concentration. Gases to the right of the formula are at the top of the print, and gases to the left are at the bottom.

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The distribution of positive and negative particles was not uniform. This hypothesis of Thomson’s atomic model was later found to be not true by Rutherford.

Because positive charge particle is in center and the negative charge particle is surround to it.

J.J. Thomson proposed that an atom is a definitely charged sphere wherein negatively charged electrons are embedded in it. Neils Bohr proved it to be false as the mass of any atom is localized inside the middle of an atom which is positively charged even as negatively charged electrons revolve across the effective center.

Thomson was incorrect due to the fact he assumed that the positive charge of an atom become all one uniform blob of count number with the electrons transferring in orbits inside the nucleus. If Thomson's model had been accurate, the alpha particles could skip thru the atomic shape of the foil unimpeded.

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Since hydroiodic acid is a strong acid and completely dissociates, we can use this formula:

pH = -log[H+]

pH = -log[0.0520]

pH = 1.284

According to Charle's law, a balloon at 600 K has a volume of 3.83 L.

Charles' law states that, under constant pressure, the volume a given amount of gas fills is directly proportional to its absolute temperature. For instance, when the temperature drops during the winter, a basketball placed outside in the ground would contract.

Mathematically, Charles' law can be written as V1/T1 = V2/T2, where V1 denotes the volume at the beginning, T1 the temperature at that point, and V2 the volume at the end with T2 the temperature at that point.

The following examples of how Charles' law is applied in real life:

Helium balloons shrink when it's cold outside.

From Charles' law, V/T = constant

V₁/T₁ = V₂/T₂

or, 2/313 = V₂/600

or, V₂ = (2x600)/313

          = 3.83

Hence, form Charles' law we conclude the volume of balloon at 600 K is 3.83 L.

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Taking into account the reaction stoichiometry, the maximum amount of SF₆ that can be produced from the reaction of 32.1 g of sulfur with 114 g of fluorine is 146.46 grams.

In first place, the balanced reaction is:

S + 3 F₂  → SF₆

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 57 grams of F₂ reacts with 32 grams of S, 114 grams of F₂ reacts with how much mass of S?

mass of F₂= (114 grams of F₂× 32 grams of S)÷ 57 grams of F₂

mass of F₂= 64 grams

But 64 grams of F₂ are not available, 32.1 grams are available. Since you have less mass than you need to react with 114 grams of F₂, S will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 32 grams of S form 146 grams of SF₆, 32.1 grams of S form how much mass of SF₆?

mass of SF₆= (32.1 grams of S× 146 grams of SF₆)÷ 32 grams of S

mass of SF₆= 146.46 grams

Finally, 146.46 grams of SF₆ can be produced from the reaction of 32.1 g of S with 114 g of F₂.

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Step 1 - Understanding the relation of potential energy, kinectic energy and the conservation of energy

The potential energy is the energy related to a body that can start moving under the influence of a force anytime soon.

The kinf of potential energy depends on the force that could act on the body. When a body is lifted, because gravity can pull it back, we say that this body has gravitational potential energy

Kinetic energy, on the other hand, is related to actual movement. It depends on the mass as well as on the velocity of the body. When we lift an object and drop it next, all the potential energy will be converted to kinetic energy, i.e., the velocity of the object we dropped will be also proportional to the height. It cannot gain more energy.

Step 2 - Interpreting the problem

Now that we know how potential and kinetic energy work, we can start working on the problem. Since potential energy is directly proportional to height, the highest potential energy would be attained at F.

The lowest potential energy, on the other hand, woud be attained at D, i.e., the smaller height.

The highest kinetic energy would be attained when all the potential energy is converted to kinetic energy, i.e., when the bicyclist, starting at A, loses its potential energy reaching D

The speed is directly proportional to the kinetic energy: the higher the speed, the higher the kinetic energy. Since the kinetic energy, as we saw, is the greatest at D, the velocity will also be the greatest at this point.

From the particles shown, the ones that will have a stronger attraction to each other are those in water H₂O. This is because water has a boiling point of 100°C while that of CO₂ is -78.5. Hence, while both are covalently bonded, the bonds in water are stronger.

It is to be noted that a covalent bond is formed between two atoms by the mutual use of one or more pairs of electrons. The two atomic nuclei attract these electrons at the same time. When the difference in electronegativities of two atoms is too tiny for electron transfer to produce ions, a covalent bond occurs.

The word "covalent bond" first appeared in 1939. The prefix co- denotes jointly, related in action, paired to a lesser degree, etc.; hence, a "co-valent bond" in essence indicates that the atoms share "valence," as defined in valence bond theory.

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Hydrochloric acid reacts with zinc, giving Hydrogen gas and zinc chloride.

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Not adversely but deer population do effects the biodiversity in a way that plant diversity specifically get reduced.

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The mole fraction of the water solution is 0.77.

The mole fraction or molar fraction is defined as a unit of the quantity of a constituent, nᵢ, divided by the total quantity of all parts in a combination.

Moles of water = given mass/ molar mass

Moles of water = 84/18

Moles of water = 4.6

Moles of hexane =  given mass/ molar mass

Moles of hexane = 100/76

Moles of hexane = 1.3

Total moles = Moles of water + Moles of hexane

Total moles = 4.6 + 1.3 = 5.9

Mole fraction of water = Moles of water / Total moles

Mole fraction of water = 4.6/5.9

Mole fraction of water = 0.77

Hence, the Mole fraction of water is 0.77.

The mole fraction is the same as the mole percent however in a specific shape in chemistry. Inside the given combination, the range of moles of one constituent is divided by the total number of moles is referred to as the mole fraction. Multiplying the mole fraction of the thing by then we gain the mole percentage of the aspect.

Mole fraction is a unit of awareness, described to be equal to the range of moles of an aspect divided through the whole wide variety of moles of a solution. Because it's miles a ratio, the mole fraction is a unitless expression.

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The empirical formula of the compound is mathematically given as

C2H4O

This is further explained below.

Generally, The empirical formula of a chemical compound is the most straightforward representation of the atom counts in the molecule as whole numbers.

As a straightforward illustration of this idea, consider the empirical formula of sulfur monoxide, which is denoted by the symbol SO, and compare it to the empirical formula of disulfur dioxide, which is denoted by the symbol S2O2.

moles of CO_2=[tex]\frac{ 1.6004 }{44.01}[/tex]

moles of CO_2= 0.0364 moles

moles of H_2O=[tex]\frac{0.6551}{ 18.01 }[/tex]

moles of CO_2= 0.0364 moles

It takes 0.0364 moles of carbon to make up 1 mole of carbon dioxide.

1 mole of H2O contains 2 moles of hydrogen, which is equal to 2 times 0.0364, or 0.0728 moles of hydrogen.

C & H = 0.0364 x 12.01

C & H= 0.437 g C

0.0728 x 1.008 = 0.0734 gH

Mass O = 0.8009 -(0.437 + 0.0734)

Mass O= 0.2905 g

O moles=[tex]\frac{0.2905}{16}[/tex]

O moles= 0.0182 moles

C = [tex]\frac{0.0364}{ 0.0182}[/tex]

C= 2

H =[tex]\frac{0.0728}{ 0.0182}[/tex]

H = 4

O =[tex]\frac{0.0182}{ 0.0182 }[/tex]

O= 1

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Answer:

5.08 x 10¹⁴ Hz

Explanation:

To find the frequency, you need to use the following equation:

f = c / λ

In this equation,

-----> f = frequency (Hz)

-----> c = speed of light (3.00 x 10⁸ m/s)

-----> λ = wavelength (m)

After converting the wavelength from nm to m, you can plug the given values into the equation and solve for "f".

 590 nm                     1 m
----------------  x  ------------------------  =  5.90 x 10⁻⁷ m
                              1 x 10⁹ nm

f = c / λ                                                              <----- Given equation

f = (3.00 x 10⁸ m/s) / (5.90 x 10⁻⁷ m)                <----- Insert values

f = 5.08 x 10¹⁴ Hz                                             <----- Divide