Choose the best answer.
Perform the indicated calculation. You may use a calculator. Remember to round your
answers according to the rules for significant figures.
0.0204 g
+ 0.002 g

The heat is released in the formation of 75.0 g of water is 14.78 kJ.

Chemical equation is defined as a chemical reactions are represented symbolically in which the reactants and products are expressed in terms of their respective chemical formulae.

There are basically five types of chemical equation.

SiO2 (s) + 4KF(g) --> SiF4(g)+ 2H2O(l)

According to the reaction

ΔH = -184 / 2 moles of water

N(water) = Q / ΔH

N(water) = 75 / - 184 / 2 moles of water

N(water) = 0.82 mole

M(water) = 18.02 g/mole

M(water) = N(water) = 0.82 x 18.02 g/mole

                                 = 14.78 kJ

Thus, the heat is released in the formation of 75.0 g of water is 14.78 kJ.

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Answer:

Al2S3

Explanation:

Both are ionic, so to find out which one has the higher melting point, remember that opposite forces attract, and the stronger the opposite forces are, the stronger they attract.
BeCl2 is made of Be 2+ and Cl (1)-, while Al2S3 is made of Al 3+ and S2-
Since 3 and 2 multiply to a larger number than 2 and 1, the attractive forces between a 3+ ion and a 2- ion are stronger than that of a 2+ ion and a 1- ion. The stronger the forces between atoms, the higher the melting point is.

The chemical formula for the ionic compound formed by Hg₂²⁺ and CO₃²⁻ is Hg₂²⁺  + CO₃²⁻  ⇄ HgCO₃

A chemical formula can be defined as the expression that states the number and type of atoms present in a molecule of a substance.

When a cation and anion combine to form a compound, there will be transfer of electron form one ion to another creating ionic bond in molecule formed.

The chemical formula for the ionic compound formed by Hg₂²⁺ and CO₃²⁻ is determined as follows;

Hg₂²⁺  + CO₃²⁻  ⇄ HgCO₃

Thus, the chemical formula for the ionic formed by the ions will have have electron transfer from one ion to another.

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If you are on 4.16 Chemical Reactions and have 18 questions, then go to the following on Quizlet for further help. Thanks and good luck!

Quizlet - "4.6 Chemical Reactions UT"

h t t p s : / / q u i z l e t . c o m / _ c 7 3 1 u j ? x = 1 q q t & i = 3 8 n a a s

All the given chemical reactions are considered to be chemical change as they are accompanied  by change in state and even evolution of gases.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer: Categorical data

Explanation: As the name implies, are usually grouped into a category or multiple categories. Similarly, numerical data, as the name implies, deals with number variables.

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The mass of the nitrogen in solution of N₂O₂, n = 4.55 g.

To calculate the mass of nitrogen using formula,

n = W / w

where,

n is mass of nitrogen

W is molecular weight of N₂O₂

w is weight of solution

So, given data are :

w = 13.2 g

W = 60.013 g

n = ?

Now, putting the values we get,

n = 60.013 / 13.2

n = 4.55 g

Hence, the mass of the nitrogen in solution of N₂O₂, n = 4.55 g.

The inorganic substance dinitrogen dioxide has the chemical formula N₂O₂. It is conceivable to have many structural isomers. Based on ab initio calculations, the covalent bonding pattern O=N-N=O is projected to be the most stable isomer and is the only one that has been created experimentally.

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The second image that is shown below accurately identifies displacement and additive plating.

The term plating is actually an electrochemical process. This implies that it has to do with a chemical reaction that involves electrochemistry. The term plating has to do with the situation where a metal is wholly or partially covered by another metal in a electrochemical process. Recall that electrons must be transferred as part of the process as it is an electrochemical process.

In the process of an additive plating, has to do with a situation where a metal is merely added to the surface of another metal without replacing the metal. In fact, the surface does have the two metals.

In the case of the displacement plating, the metal that was initially on the surface is replaced and then we have a whole new metal that is present on the surface as shown in the image in the question.

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Burning 1.09g of a fuel causes the water in a calorimeter to increase by 13.6 °C. If the calorimeter has a heat capacity of 3.09 kJ/°C, what is the energy density of the fuel is - 38.55 kJ/g.

given that:

c =  3.09 kJ/°C

ΔT = 13.6 °C

heat capacity equation is given by :

q = c ΔT

q = 3.09 kJ/°C ×  13.6 °C

q = 42.02 kJ

according to law of conservation of energy sum of heat released by fuel and absorbed by calorimeter is zero

qf + qcal = 0

qf = - q cal = -42.02 kJ

now, The energy density of fuel = - 42.02 kJ / 1.09 g

                                                      = - 38.55 kJ/g

Thus, Burning 1.09g of a fuel causes the water in a calorimeter to increase by 13.6 °C. If the calorimeter has a heat capacity of 3.09 kJ/°C, what is the energy density of the fuel is - 38.55 kJ/g.

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Answer:

d valance electrons

Explanation:

Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair.

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The properties of an alloy are similar to the properties of its components. The elements in an alloy are not combined in fixed proportions is an alloy not considered a compound

Although the physical characteristics of the alloy are intermediate to those of its component metals, the chemical characteristics of each element are unaltered. Physical methods can be used to separate an alloy (separated by melting). A compound is a collection of several components that are connected by chemical connections.

Metal mixes or blends of a metal and another element are known as alloys. A combination of metallic phases or a solid solution of metal elements, known as an alloy, are both possible (a heterogeneous mixture of two or more solutions).

An alloy is a combined, homogenous combination of a metal with other metals or non-metals.

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Answer: Answer is B and C

b: the properties of an alloy are similar to the properties of its components.

c: The elements in an alloy are not combined in fixed propo

Explanation:

The changes that I would make in my experimental procedure to  determine the rate law for the oxidation of the red dye by sodium hypochlorite is that the wavelength at which the dye concentration is calculated would be changed as a result of the operation.

Since there would be an alteration in the wavelength at which the dye concentration, You shouldn't measure at the wavelength where the blue dye absorbs since you would no longer be attempting to detect the rate of oxidation of the blue dye.

Most likely, the red dye absorbs more light at a different, lower wavelength. Decide on the best wavelength to use to measure the red dye concentration, then switch to that wavelength to evaluate the kinetics.

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The number of moles of oxygen produced is 0.065 mol.

The molarity of a chemical compound is largely decided in chemistry by trying to divide the mass of a sample of that compound by the amount of substance of that compound, which corresponds to the number of moles in that specimen, evaluated in moles. A substance's molar mass is a bulk property rather than a molecular one. A substance's molar mass is its mass in grams per mole of the compound. A mole is the measurement of the quantity of atoms, molecules, or ions in a substance. A mole is 6.022 1023 molecules of any given substance.

The total mass of all the atoms in a molecule expressed in grams per mole is known as the molar mass.

The mass of the oxygen gas produced = 2.1 g

The molar mass of oxygen gas  , [tex]O_{2}[/tex] = 2 × 16 g/mol

= 32 g/mol

The formula for the calculation of moles

= mass taken /  molar mass

Thus,

Moles = 2.1 / 32

= 0.065 mol

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The amount, in grams, of calcium hydroxide that would be required for the complete reaction with 23.1 g sulfuric acid will be 17.44 grams.

In order to solve this problem, we first need to get the balanced equation of the reaction:

[tex]H_2SO_4 + Ca(OH)_2 -- > CaSO_4 + 2H_2O[/tex]

For a complete reaction, the mole ratio of the sulfuric acid to calcium hydroxide is 1:1.

Recall that: mole = mass/molar mass

Molar mass of sulfuric acid = 98 g/mol

Mole of 23.1 grams sulfuric acid = 23.1/98

                                             = 0.2357 moles

This means the mole of calcium hydroxide required will also be 0.2357 moles.

Now, let's find the equivalent mass of the calcium hydroxide.

Mass = mole x molar mass

Molar mass of calcium hydroxide = 74 g/mol

Mass of 0.2357 calcium hydroxide = 0.2357 x 74

                                                      = 17.44 grams

Thus, the mass of calcium hydroxide that would be needed for a complete reaction is 17.44 grams.

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Answer:

Explanation:

yt maybe

A snow globe is a suspension combination because it shakes up with snow all over it, which eventually settles.

Glycerin, a transparent liquid that is often manufactured from vegetable oils, is one of the secrets to making a snow globe. It is used frequently to reduce the impact of glitter and agitated water on the appearance of snowfall. Your snow globes risk drying out, cracking, and color fading if the right precautions aren't taken to protect them. In general, you should store your snow globes away from hot surroundings, bright sunlight, and other risky places where they could break.

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Answer:

Aniline reacts with bromine water to give a white precipitate.

Answer:

nuclear is the center part of an atom

Explanation:

it contains neutron and proton (positive charged)

it gets revolved by electron

Answer: Bro you can use Bartleby for this answer

Explanation:

Mussorgsky dedicated his work Pictures at an Exhibition to a friend, the painter Vladimir Hartmann, who had passed away at the age of 39 at the height of his fame.

Mussorgsky through his music, and Hartmann through his images. The Academy of Fine Arts in St. Petersburg organized an exhibition of Hartmann's artwork in 1874. After visiting the exhibit, Mussorgsky was moved to write his piano piece.

Mussorgsky dedicated his work Pictures at an Exhibition to a friend, the painter Vladimir Hartmann, who had passed away at the age of 39 at the height of his fame. The composer and the larger Moscow artistic community were profoundly affected by the loss of both a close friend and an artistic inspiration.

The design of Hartmann's massive, imposing gate, which was intended to honor the fact that Tzar (king) Alexander the II had survived an attempted assassination, served as the inspiration for the Great Gate of Kiev.

Therefore, the correct answer is option C. It complimented Hartmann's work.

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The liquid filtrate that you collect after filtering your solid product will be acidic no its not acidic its basic

Filtration is a technique used either to remove solid impurities from an organic solution or to isolate an organic solid and the two types of filtration commonly used in organic chemistry laboratories are gravity filtration and vacuum or suction filtration

Filtration is the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles and either the clarified fluid or the solid particles removed from the fluid may be the desired product and when we filtrate the liquid part then precipitation is stick means solid part is stick to the filter paper and other liquid part is filtered and this ppt is not the acidic its a basic part

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The energy of the electron is obtained as -0.85 eV.

From the Bohr model of the atom, we know that the electrons that can be found in the shells of hydrogen do have a specific energy level where they could be found. As such the reason being the spectrum of the hydrogen atom is the movement of an electron from one energy level to another.

We can be able to obtain the energy of each of the orbits of the hydrogen atom by the use of;

E = -13.6/n^2

Where n is the principal quantum number.

E =  -13.6/(4)^2

E = -0.85 eV

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Answer:

Average atomic mass: 132.85a. m. u.

Explanation:

The average atomic mass could be found by:

Average mass = ∑ (Abundance percentage × isotope mass)

⇒ Average mass = (0.75 × 133) + (0.20 × 132) + (0.05 × 134) = 132.85a. m. u.

Hope this helps! :)

The atomic mass of rubidium is 86.09 amu as rubidium has two common isotopes, rubidium-85 and  rubidium-87 is 84.42 amu.

Abundance of Rubidium-85 = 72.1%

Abundance of Rubidium-87 = 26.7%

To calculate average atomic mass of rubidium -

The percentage of abundances are divided by hundred to obtain a decimal value.

The obtained value of each isotope is multiplied by its atomic mass.

All the isotopic values are added.

So,

Rb-85 = 72.1 = 0.721

              100

Rb-87 = 26.7 = 0.267

              100

Atomic mass of Rb-85 = 0.721 × 84.91

                                     = 61.22 amu

Atomic mass of Rb-87 = 0.267 × 86.91

                                     = 23.20 amu

Hence,

the average atomic mass = 61.22 amu + 23.20 amu

                                            = 84.42 amu

Therefore, atomic mass of rubidium is 84.42 amu.

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a)  Fe does not fit in the Colum 7, Because Fe shows different in chemical Properties. its valance electron configuration  is different from oxygen and sulfur.

b) The gaps that Mendeleev left in his table were one of its distinctive features. He not only predicted the existence of yet-undiscovered elements in these locations, but also their atomic weights and other properties.

c) The modern periodic  table is the arrangement of elements in increasing order of their atomic numbers.

d) Lithium ,potassium  and Sodium have electronic configuration end with S1. since  they are in group 1.

The current periodic law serves as the foundation for the periodic table's lengthy form. The elements are organized in the table in ascending order of their atomic numbers. The periodic chart as it exists now is known as the contemporary periodic table. 18 vertical columns and 7 horizontal rows make up the structure.

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Solutions:

• Hot air rises because as the air is heated, it enlarges or swell up, resulting in reduced density, hence it rises .

• The molecules in the hot air also heats up and move faster and spreads out and hits the inside of the baloon pushing it upwards since the its density is lesser than when it was cooled.

Answer:

Explanation:

was up yo boi

its neutron

Explanation:

Neutrons are located in the nucleus with the protons. Along with protons, they make up almost all of the mass of the atom. The number of neutrons is called the neutron number and can be found by subtracting the proton number from the atomic mass number.

Answer: CH40 ( the 4 is not a whole number )

Explanation: If we assume that we have a sample of 100g of the compound, then that would mean we have 37.47 grams (3.12 moles) of carbon, 12.61 grams (12.48 moles) of hydrogen, and 49.92 grams (3.12 moles) of oxygen. The molar ratio of C:H:O is 3:12:3, reducing to 1:4:1, giving the empirical formula of CH4O.

The net ionic equation for the precipitation of calcium phosphate from aqueous solution is  Ca²+ (aq)+ S²- (aq)=>CaS(s)-----> CaS(s).

For a precipitation reaction, the net ionic equation is written by first knowing the precipitate, then use the solubility rules (if there are any).

Then one can write down the precipitate's formula that was made to the right of an arrow. The ions that react to get the precipitate as the reactants to the left of the arrow should have their formulas written down also:

Hence:

Since the molecular fomular is: H2S(aq) + CaCl2(aq) -------> CaS(s) + 2HCl(aq)

Then the full ionic equation will be: 2H^+(aq) + S²-(aq) + Ca²+(aq) + 2Cl^-(aq) -------> CaS(s) + 2H^+(aq) + 2Cl^-(aq)

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