Subtract to find the temperature changes
for the water and the metal.
AT (water) =
AT (metal) =

Answer : The value of [tex]\Delta H_{rxn}[/tex] for the reaction is, -390.3 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The main chemical reaction is:

[tex]CH_4(g)+4Cl_2(g)\rightarrow CCl_4(g)+4HCl(g)[/tex]    [tex]\Delta H_{rxn}=?[/tex]

The intermediate balanced chemical reaction are:

(1) [tex]C(s)+2H_2(g)\rightarrow CH_4(g)[/tex]     [tex]\Delta H_1=-74.6kJ[/tex]

(2) [tex]C(s)+2Cl_2(g)\rightarrow CCl_4(g)[/tex]     [tex]\Delta H_2=-95.7kJ[/tex]

(3) [tex]H_2(g)+Cl_2(g)\rightarrow 2HCl(g)[/tex]     [tex]\Delta H_2=-184.6kJ[/tex]

Now we are reversing reaction 1, multiplying reaction 3 by 2 and then adding all the equations, we get :

(1) [tex]CH_4(g)\rightarrow C(s)+2H_2(g)[/tex]     [tex]\Delta H_1=74.6kJ[/tex]

(2) [tex]C(s)+2Cl_2(g)\rightarrow CCl_4(g)[/tex]     [tex]\Delta H_2=-95.7kJ[/tex]

(3) [tex]2H_2(g)+2Cl_2(g)\rightarrow 4HCl(g)[/tex]     [tex]\Delta H_2=2\times (-184.6kJ)=-369.2kJ[/tex]

The expression for enthalpy change for the reaction will be,

[tex]\Delta H_{rxn}=\Delta H_1+\Delta H_2+\Delta H_3[/tex]

[tex]\Delta H_{rxn}=(74.6kJ)+(-95.7kJ)+(-369.2kJ)[/tex]

[tex]\Delta H_{rxn}=-390.3kJ[/tex]

Therefore, the value of [tex]\Delta H_{rxn}[/tex] for the reaction is, -390.3 kJ

Answer:

An acid produces hydrogen ions in aqueous solution because it reacts with the water molecules by giving a proton to them.

Explanation:

When hydrogen chloride gas dissolves in water to produce hydrochloric acid, the hydrogen chloride molecule gives a proton (a hydrogen ion) to a water molecule.

Answer:

Acids produce hydrogen ions in aqueous solution because they have a higher concentration of hydrogen ions than hydroxyl ions and that's the reason too why they have a lower pH.

Hope this helps.

Answer:

D

Explanation:

To solve this we must be knowing each and every concept related to  activity series. Therefore, Fe + Cu(NO[tex]_3[/tex])[tex]_2[/tex] reactants will form products. The correct option is option D.

We refer to the metal series in the image above as the activity series. This serves as a guide so that we can identify the byproducts of a metal displacement process. For displacement to take place, a metal must be placed over the other metallic combination.

Ag is significantly lower than Na in the series so, nothing happens. Since Al is above Fe, there is no response. Ni is below Na, hence no reaction will take place. A displacing reaction will happen because Fe is a greater active metal than copper.

Therefore, Fe + Cu(NO[tex]_3[/tex])[tex]_2[/tex] reactants will form products. The correct option is option D.

To know more about activity series, here:

https://brainly.com/question/4406404

#SPJ6

Answer:

Vn = k

Explanation:

[tex]Vn = k[/tex]

From the web :

Avogadro's Law is stated mathematically as follows: Vn=k, where V is the volume of the gas, n is the number of moles of the gas, and k is a proportionality constant

Avogadro's Law is stated mathematically as follows: Vn=k, where V is the volume of the gas, n is the number of moles of the gas, and k is a proportionality constant.

According to Avogadro's Law, all gases have an identical number of molecules in an equal volume at a given temperature and pressure. Amedeo Avogadro, an Italian chemist and physicist, first described the law in 1811.

At 0 °C and 1 abm pressure, the molar volume of all ideal gases is 22.4 litres.  If a gas's temperature and pressure remain constant, its volume will also grow as its amount increases.

If a gas's pressure and temperature are both constant, its volume falls as its volume of gas does. Every time you blow a balloon up, you demonstrate Avogadro's Law.

Therefore, Avogadro's Law is stated mathematically as follows: Vn=k, where V is the volume of the gas, n is the number of moles of the gas, and k is a proportionality constant.

To learn more about Avogadro's Law, refer to the link:

https://brainly.com/question/4133756

#SPJ7

Answer:

c elementary

Explanation:

they are formed and then created later

Answer:

C

Explanation:

Oxidation occurs at the anode. That means the element's oxidation number should increase. Mg has an oxidation number of 0, but Mg2+ has an oxidation number of 2, showing it was oxidized.

Answer:

The atom with one outer most electron is sodium

The atom with two outermost electrons is magnesium

The atom with five outermost electrons is phosphorus

Explanation:

A dot structure of an atom shows the number of electrons present on the outermost shell of that atom. In order words, a dot structure shows the valence electrons present on the valence shell of an atom.

Sodium has an atomic number of 11, hence the electrons are arranged in three shells in the following order 2,8,1. This implies that one electron is present on it's outermost shell.

Magnesium has an atomic number of 12. Its electrons are arranged in shells in the order; 2,8,2. Hence, two electrons are present in its outermost shell.

Phosphorus contains 15 electrons(atomic number of 15), these electrons are arranged in shells in the order 2,8,5. Hence there are five outermost electrons present in phosphorus.

Answer:

1 dot sodium

2 dots Magnesium

7 dot Fluorine

5 dot Phosphorus

Explanation:

Answer:

Solar Energy & Wind Energy

Explanation:

These are renewable energy and can be used used in replacement for fossil fuels.

PLS MARK ME AS BRAINLIEST!!

Answer: A. Electrons are knocked off atoms, causing electricity to flow.

Explanation:

Photoelectric effect is defined as emission or ejection of electrons from the surface of a metal when a light of certain frequency falls on the surface of the metal. Electrons emitted in this effect can be called photoelectrons.

The light which falls on the surface of the metal must be of sufficiently high frequency called as threshold frequency.

Thus light knocks off the electrons and thus the flow of electrons will result in the production of electricity.

Thus the correct option is Electrons are knocked off atoms, causing electricity to flow.

Answer:a

Explanation:

In the position A, the potential energy is maximum and the kinetic energy is  minimum. At the point B, kinetic energy is highest. At the point C, the losing kinetic energy, gaining potential energy and at D, losing potential energy, gaining kinetic energy.

Kinetic energy of moving body is the energy generated by virtue of its position. Potential energy is generated by virtue of its position at a height from the surface. When a body starts moving from rest, its potential energy starts convert to kinetic energy.

As the height increases,  potential energy increases. When an object moves down, its acceleration due to gravity increases and more energy to fall down make its kinetic energy higher.

Thus, the situations can be matched as follows;

A, the potential energy is maximum and the kinetic energy is  minimum. B, kinetic energy is highest.

C, the losing kinetic energy, gaining potential energy and

D, losing potential energy, gaining kinetic energy.

Find more on kinetic energy :

https://brainly.com/question/26472013

#SPJ2

The correct answer is B. Direct democracy

Explanation:

In a direct democracy, the citizens have a direct influence on government including laws, this means political decisions are made based on the opinion of citizens. This form of government differs from indirect democracy because in indirect democracy citizens only vote to choose representatives but do not participate directly in each political decision. The example presented is an example of direct democracy because even if some are not considered citizens, those who have the quality of "citizens" directly participate in the political decisions.

According to Avogadro's law, volume is directly proportional  to number of moles which is in relation with the grams of a compound.

Avogadro's law is a gas law which states that the total number of atoms or molecules has a direct proportion to the volume occupied by a gas at a constant temperature and pressure.

It is closely related to ideal gas equation as it links temperature, pressure, volume and the amount of substance.It is given as, V∝n,

The straight line graph of volume versus moles is a straight line passing through the origin which implies that zero moles of gas occupy zero volume.The law was proposed by Amedeo Avogadro in year 1811.

The law can be derived from the assumption of kinetic theory  of gases considering their ideal behaviour.

Learn more about Avogadro's law,here:

https://brainly.com/question/4133756

#SPJ2

Answer:

11 grams

Explanation:

Answer:

b, the number of protons added to the number of neutrons

Explanation:

Answer:

B

Explanation:

If you remeber a balloon in hot air, it pops. This is because the molecules are moving too fast and need more space to move, thus popping the balloon. If you put a balloon in cold air, then it shrinks, the molecules not moving fast enough and don't need as much space.

Answer:

C. 3.05 x 10⁻¹⁹ J

Explanation:

Given;

wavelength of the light, λ = 652 nm = 652 x 10⁻⁹ m

speed of light, c = 3.00 x 10⁸ m/s

Planck's constant, h = 6.626 x 10⁻³⁴J·s

Energy of electromagnetic wave is calculated as;

E = hf

where;

f is frequency of the light wave

f = c / λ

[tex]E = hf = h\frac{c}{\lambda} \\\\E = \frac{hc}{\lambda} \\\\E = \frac{6.626*10^{-34}*3*10^8}{652*10^{-9}} \\\\E = 3.05*10^{-19} \ J[/tex]

Therefore, the energy of the light is 3.05 x 10⁻¹⁹ J

The correct option is "C"

C. 3.05 x 10⁻¹⁹ J

Answer:

Option C. 3.05 x 10¯¹⁹ J

Explanation:

Step 1:

Data obtained from the question.

wavelength (λ) 652 nm = 652x10^–9m

Velocity of light (v) = 3.00x10^8 m/s

Planck's constant (h) = 6.626x10^-34J·s

Step 2:

Determination of the frequency of the light.

The frequency can be obtained as follow

v = λf

3x10^8 = 652x10^–9 x f

Divide both side by 652x10^–9

f = 3x10^8 / 652x10^–9

f = 4.6x10^14s¯¹

Step 3:

Determination of the energy of the light wave.

This can be obtained as follow:

Planck's constant (h) = 6.626x10^-34J·s

Frequency (f) = 4.6x10^14s¯¹

Energy (E) =..?

E = hf

E = 6.626x10^-34 x 4.6x10^14s¯¹

E = 3.05 x 10¯¹⁹ J

Answer:

d

Explanation:

edg2020

Answer: C. Based in previous data, ten hurricanes may occur in the year 2013.

Explanation:

Inference can be explained as conclusion made from an existing evidence or facts. Option C, best fits an inference statement.

Answer:

C

Explanation:

because everything looks like opinions

Answer:

29.98kg

Explanation:

12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg

29.98kg of gasoline fill a 12.0-gal gas tank

gasoline or gas or petrol a mixture of volatile, flammable liquid hydrocarbons which is derived from petroleum and used in many application like fuel in internal-combustion engines, solvent for oils and fats.

It is a by-product of the petroleum industry, used in automobile fuel due to its high energy of combustion and easily mix with air in a carburetor.

Gasoline is produced by distillation by separating the volatile substance, later on other designed process  yield of gasoline from crude oil by splitting large molecules into smaller ones by cracking method.

12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg of gasoline fill the tank.

For more details regarding gasoline, here

https://brainly.com/question/12847098

#SPJ2

Answer:

polar covalent bond

Explanation:

Answer:

B.

Explanation:

CO2 + H2 + O2 - are 3 individual substances.

Answer:

in explanation

Explanation:

Human hands are distinguished from apes by possessing longer thumbs relative to fingers.

Hope this helps!!!

Answer:

The human hand and primate hand both have finger prints and palm prints, or palmar whorls, but the prints differ. Human fingerprints have a higher ride density than primate fingerprints, which means the print ridges, or lines, are closer together. While the human’s prints are denser, primates usually have more lines overall.

Explanation:

I've learned this before

Answer:

600 V

Explanation:

The transformer equation helps us to calculate the relationship between the ratio of the number of turns of coils in the input and output sources to their respective voltages.

It states that the ratio of the secondary to primary voltages in a transformer equals the ratio of the number of loops in their coils.

Number of input turns/Number of output turns = input voltage/output voltage

10/50 = 120V/output voltage

output voltage = 120 V/0.2

Output voltage = 600 V

Answer:

B. Areas within an energy level that are occupied by electrons

Explanation:

Its not A because there are different orbitals on each energy level.

Answer:

B

Explanation:

Answer: Four carbon dioxide molecules and four water molecules

Explanation:

Answer:

D: four carbon dioxide molecules and two water molecules

Explanation:

There are four carbon dioxide molecules (CO₂) on the right side of chemical reaction, because there are four carbon atoms on the left side of balanced chemical reaction.

There are four water molecules (H₂O) on the right side of chemical reaction, because there are eight hydrogen atoms on the left side of balanced chemical reaction.

Answer:Ethyne

Explanation:

Ethyne is more commonly known under the trivial name acetylene. It is the simplest of the alkynes, consisting of two carbon atoms connected by a triple bond, leaving each carbon able to bond to one hydrogen atom. Since both carbon atoms are linear in shape, all four atoms lie in a straight line.

2-nonyne molecule is an alkyne. Hence, option B is correct.

Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon-to-carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.

Ethyne is more commonly known under the trivial name acetylene. It is the simplest of the alkynes, consisting of two carbon atoms connected by a triple bond, leaving each carbon able to bond to one hydrogen atom.

Since both carbon atoms are linear in shape, all four atoms lie in a straight line.

Hence, option B is correct.

Learn more about alkyne here:

https://brainly.com/question/23508203

#SPJ2

Answer:

The Answers are: A. C. D.

Answer:

by making quantitative observations about the number of ants found on each plate of food

by comparing a plate of cooked brown rice to another household food such as peanut butter

by designing an experiment to test different foods and the number of ants each food attracts

Explanation:

It was right on edge