The equation for the combustion of CH4 (the main component of natural gas) is

CH4(g)+2O2(g)→CO2(g)+2H2O(g) ΔH∘rxn=−802.3kJ
How much heat is produced by the complete combustion of 271 g of CH4? in kJ

Answer : i think the answer is A

Explaination : its not D , C i feel like it would be bigger so there would be more transpiration an B less would not have bigger so i hope this helps have a good day ☆

Answer:

176 g of CO₂.

Explanation:

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

2C₂H₂ + 5O₂ —> 4CO₂ + 2H₂O

Next, we shall determine the mass of C₂H₂ that reacted and the mass of CO₂ produced from the balanced equation.

This is illustrated below:

Molar mass of C₂H₂ = (2×12) + (2×1)

= 24 + 2 = 26 g/mol

Mass of C₂H₂ from the balanced equation = 2 × 26 = 52 g

Molar mass of CO₂ = 12 + (2×16)

= 12 + 32 = 44 g/mol

Mass of CO₂ from the balanced equation = 4 × 44 = 176 g

From the calculations made above,

52 g of C₂H₂ reacted to produce 176 g of CO₂.

Answer:

D.

Explanation:

I did this question in school and got it right.

Answer:

The answer to your question is when the size, shape, or state of matter changes.

Explanation:

Change that does not undergo in the chemical composition.

Answer:

Tetrahedral

Explanation:

SF2H2 is a derivative of the sulfuranes (SL4) compounds. The quantum mechanics of these sulfuranes is quite complicated.

Simply, they consist of ten electrons around the sulphur central atom one of which is a lone pair. The electronegativity of fluorine plays a key role in the structure and molecular geometry of SF2H2.

The molecule is found to be tetrahedral in shape by quantum mechanical calculations.

Answer:

1:2:1

Explanation:

i just think hai .its just a guess from my side...sorry if i m wrong...

Answer:

1:2:1

Explanation:

Hello person in the future. Good luck with your test and I hope you do great things with your life. You got this!! :D

in the equation of reaction given, breaking bonds in NaCl and H20 requires energy as they are both endothermic reactions.

A chemical reaction is a change which results in the permanent rearrangements of atoms of a substance and the formation of a new substance.

In a chemical reaction, bond breaking in endothermic reactions requires energy.

Therefore, in the equation of reaction given, breaking bonds in NaCl and H20 requires energy.

Learn more about bond breaking energy at: https://brainly.com/question/26369483

#SPJ2

Answer:

Breaking bonds in NaOH and HCl

Explanation:

its the correct answer

Answer:

a element

Explanation:

In science copper is a element. It is one of the transition metals found on the periodic table of elements.

Elements are distinct substances that cannot be split-up into simpler substances. Such substances consist of one kind of atom.

There are over a hundred elements that are known till date.

Each elements combines to form a compound

Answer:its an element

Explanation:

Answer: The value of [tex]\Delta H[/tex] is 1118 .

Explanation:

To calculate the number of moles,  we use the equation:

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{molar mass}}[/tex]    

[tex]\text{Moles of} H_2S}=\frac{9.82g}{34.1g/mol}=0.288mol[/tex]    

The balanced chemical reaction is:

[tex]2H_2S(g)+3O_2(g)\rightarrow 2H_2O(l)+2SO_2(g)[/tex]

Given :

Energy released when 0.288 mole of [tex]H_2S[/tex] is reacted =  161 kJ

Thus Energy released when 2 moles of [tex]H_2S[/tex] is reacted = [tex]\frac{161}{0.288}\times 2=1118kJ[/tex]

Thus the value of [tex]\Delta H[/tex] is 1118.

Answer:

2KCl + F₂   →     2KF + Cl₂

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

2KCl + F₂   →     2KF + Cl₂

In this equation mass of reactant and product is equal. There are 2 potassium 2 chlorine and fluorine atoms on both side of equation it means mass remain conserved.

All other options are incorrect because mass is not conserved.

Mg₂ + LiBr ---> LiMg + Br

In this equation mass of magnesium is more on reactant side.

Na +O₂ ---> Na₂O

In this equation there is more oxygen and less sodium on reactant side while there is more sodium and less oxygen on product side.

H₂O ---> H₂ + O₂

In this equation there is less oxygen on reactant side while more oxygen on product side.

Answer:

true

Explanation:

Answer:

This is true

Explanation:

if birthrate is higher than death rate then more babies= higher population

Answer:

Green.

Explanation:

Only the particles that hit the nucleus of the atom bounced off.

Answer:I think it’s 70 her speed

Explanation: What I did was divid 1,750/25 and it got me 70

Explanation:

double replacement is type of reaction of this.it is already balanced.

Answer:

Newton's law also states that the strength of gravity between any two objects depends on two factors: the masses of the objects and the distance between them. Objects with greater mass have a stronger force of gravity between them.

Answer:

Mechanical waves travel through matter, causing it to vibrate, expand and contract, move up and down, side to side, or in circles. They include water waves, sound waves, and seismic waves. ... They all travel at the same speed — the speed of light — in a vacuum, but when they come into contact with matter, they slow down.

Answer: Rate = 0.14 kg/s

Explanation: The Haber reaction is demonstrated below in the balanced equation

[tex]N_{2}+3H_{2}[/tex] → [tex]2NH_{3}[/tex]

To determine the rate of ammonia production, we need to determine the amount of nitrogen gas is being consumed.

As it is a gas, we can find moles by using Ideal Gas Law, whose formula is

PV = nRT

P is pressure

V is volume

n is moles

R is universal gas constant

T is temperature in Kelvin (K)

For the nitrogen gas, temperature will be

T = 273 + 17.2

T = 290.2 K

Solving for moles:

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

[tex]n=\frac{0.88(112)}{0.082(290.2)}[/tex]

n = 4.14 moles

In the Haber reaction, it is consumed 4.14 moles per second of nitrogen gas.

From the balanced equation, we know 1 mol of nitrogen gas produces 2 moles of ammonia, so

[tex]n_{NH_{3}}[/tex] = 2(4.14)

[tex]n_{NH_{3}}[/tex] = 8.48 moles

Number of moles (n) is mass in grams divided by molar mass of the compound:

[tex]n=\frac{m}{M}[/tex]

Molar mass of ammonia is M = 17.031 u, so mass produced is

m = n.M

m = 8.48(17.031)

m = 144.42 g

In kilograms, m = 0.14 kg

When consuming N₂ at a rate of 4.14 moles/s, it will be produced ammonia at a rate of 0.14 kg/s

Answer:

7 sublimation

8 freezing

9 melting

10 condensation

11 evaporation

Explanation:

Answer:

15 neutrons

Explanation:

Number of neutrons = atomic mass - number of protons.

So Neutrons = 28 - 13 protons

(Since atom is neutral, number of electrons = number of protons, which is how I get the 13 protons)

Neutrons = 15

Answer:

1. Volcanoes and minor earthquakes

2. Volcanoes, earthquakes and fold mountains.

3. Earthquakes and fold mountains.

4. Magma from volcanoes is filled with nutrients that makes land fertile.

Explanation:

Answer:

Adding heat and increasing concentration are meant to cause an increase in the rate of a reaction

Explanation:

The rate of a chemical reaction is defined as the number of moles of reactants converted or products formed pee unit time. It is a measure of how quickly the reactants in a given reaction are used up to form products or how quickly products are formed from reactants.

Factors that affect the rate of a chemical reaction include:

1. Nature of reactants

2. Concentration/pressure (for gases) of reactants

3. Temperature of reaction mixture

4. Presence of light

5. Presence of a catalyst

The effect of increasing the concentration of reactants for a given chemical reaction is that the reaction rate will increase. This is so because, according to the collision theory of chemical reactions, the frequency of collision between reactant particles which results in a chemical reaction (effective collisions) will increase when the reactant particles are crowded together in a small space due to an increase in their concentration.

The effect of increasing temperature or adding heat to a reaction is that the reaction rate increases. When the heat is added to a reactant particles, the number of particles with energies greater than or equal to the activation energy (the minimum amount of energy that reactant particles must possess for effective collisions) increases. Also, the average speed of the reactant particles increases resulting in a greater frequency of collision. Hence, the rate of the chemical reaction increases.

Answer:

pH = 4.349

Explanation:

When HI is added to sodium acetate, CH3COONa, acetic acid is produced as follows:

CH3COONa + HI → CH3COOH + NaI

That means the moles of HI added are the moles of acetic acid produced and the moles of sodium acetate consumed.

Moles of HI:

0.0605L * (0.223mol/L) = 0.01349mol

To find pH of the buffer (Mixture of weak acid, acetic acid, and conjugate base, sodium acetate) we need to solve H-H euation:

pH = pKa + log [CH3COONa] / [CH3COOH]

Where pKa is -log of Ka of the acid: -log1.8x10⁻⁵ = 4.745

And [] could be taken as moles of each specie

Moles CH3COONa:

Inital moles: 0.086L * (0.385mol/L) = 0.03311

Final moles: 0.03311mol - 0.01349mol = 0.01962mol CH3COONa

Moles CH3COOH:

Inital moles: 0.086L * (0.410mol/L) = 0.03256

Final moles: 0.03256mol + 0.01349mol = 0.04875mol CH3COOH

pH = 4.745+ log [0.01962mol CH3COONa] / [0.04875mol CH3COOH]

pH = 4.3497

Rigth answer is:

Answer:

Seven electrons.

Explanation:

There are seven valence electrons in each fluorine atom because it belongs to halogens. Fluorine atom requires one electron to complete its valence shell to become stable so for that it form both ionic and covalent bonds with different atoms. It makes ionic bond with alkali metals by accepting one electron to complete its valence shell and also make covalent bond by sharing of electrons.

Answer:

Explanation:

Each magnesium atom loses two electrons and each iodine atom gains one electron. So there should be a 1-to-2 ratio of magnesium ions to iodide ions.