Answer:
The combustion will release -3,321 KJ/mol of energy
Explanation:
What we need to do here is to first calculate the number of moles of methane burnt.
Mathematically, the number of moles of methane burnt = mass of methane/molar mass of methane
Molar mass of methane = 16g /mol
Thus the
number of moles will be ;
59.7/16 = 3.73 moles
Now, 1 mole of methane produces -890 KJ/mol if energy
Then the energy produced by by 3.73 moles of methane would be 3.73 * 890 = -3,320.8125
which is approximately -3,321 KJ/mol
Kindly note that the amount of heat is negative because it is an exothermic reaction
Question 1 of 6
Which set of coefficients correctly balances the following chemical equation?
Fe +
Cl2 = FeCl3
(1 point)
DA. 2, 3,2
1
C. 1, 1, 1, (already balanced)
D. 4,6,4
E. 2, 1, 2
tea
B. 1, 2,
Answer:
Option A. 2, 3, 2
Explanation:
We'll begin by balancing the equation. This can be achieved by doing the following:
Fe + Cl2 —> FeCl3
There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of Cl2 and 2 in front of FeCl3 as shown below:
Fe + 3Cl2 —> 2FeCl3
There are 2 atoms of Fe on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Fe as shown below:
2Fe + 3Cl2 —> 2FeCl3
Now the equation is balanced.
The coefficients are : 2, 3, 2
1 When a chemical reaction occurs A. the substances involved do not mix together and maintain their original properties. B. the properties of the substances that are produced are identical to the properties of the original substances. C. the substances involved mix together but maintain their original properties. D. the proberties of the substances that are produced are different from the properties of the original substances.
Answer:
D
Explanation:
The proberties of the substances that are produced are different from the properties of the original substances.
Assign oxidation numbers to each atom in KBrO4
Answer:
K: +1
Br: +7
O: -2
Explanation:
O is always -2
K is in group one, so that is its charge
-8+1 is -7, so we flip the sign and that becomes Br
The reason why we flip it is to get a net balance of 0
Matter can not be created nor destroyed: it can only be
a)Destroyed a little bit
b)Invisible
c)Transformed, changed
d)None of the above
Answer:
C- transforemed or changed
Explanation:
matter can be changed by application of heat or cold
The volume of an ideal gas is inversely proportional to the pressure
applied to the gas at a constant temperature. A gas has a volume of
239 liters at a pressure of 2.00 atmospheres (atm). What pressure is
applied to this gas if the volume is .500 liters?
Answer:
Final pressure is 0.956 atm
Explanation:
Based on Boyle's law, "The volume of an ideal gas is inversely proportional to the pressure when temperature is constant". The equation is:
P₁V₁ = P₂V₂
Where 1 represents initial state and 2 final state of the gas.
If a gas has 239L and 2.00 atm as initial state. If the final volume is 500L:
239Lₓ2.00atm = P₂500L
239Lₓ2.00atm / 500L = P₂
0.956atm = P₂
DISCUSSION QUESTIONS:
1) Distinguish how P-waves and S-waves travel differently with illustrations and
labels.
2) What type of seismic wave will reach a recording station 500 miles away from the epicenter first
Answer:
P-waves compression waves while S-waves are shear waves.
Explanation:
P- waves has the ability to travels through solid, liquid and gaseous medium while S-waves travels through only solid medium and restricted by liquid and gaseous medium. P-waves is a type of seismic wave that will reach first to the recording station as compared to S-waves because P-waves moves faster that S-waves that moves slower so that's why P-waves reach first on the recording station that is located 500 miles away.
An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of
A) 2–
B) 2+
C) 3+
D) 3–
The answer is D. Why the answer is not A but D? Can you explain?
The net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.
HOW TO CALCULATE NET CHARGE:
The net charge of an ion can be calculated by subtracting the number of electrons from the number of protons in an atom. That is;net charge = no. of protons - no. of electrons
The number of protons is the number of positive charges while the number of electrons is the number of negative charges in an atom. Therefore, if an ion consists of 7 protons, 9 neutrons, and 10 electrons, the net charge is as follows:net charge: 7 - 10
net charge = -3
Therefore, the net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.Learn more: https://brainly.com/question/21430387?referrer=searchResults
How many moles of KNO3 will be required to prepare 8.0L of 1.40 M KNO3?
Answer:
11.2 moles of KNO3 will be required to prepare 8.0 L of 1.40 M KNO3
Explanation:
To answer this question, we need an understanding of the units of the term called molarity.
1.40M KNO3 means that there are 1.4 moles per dm^3 or per liter of the solution.
Now, since there are 1.4 moles in 1 liter
x moles will be present in 8.0 liters
Thus, mathematically;
x * 1 = 8 * 1.4
x = 11.2 moles
23592U + 10n → ____10n + 13956Ba + 9436Kr
Answer:
nice question dont know the answer tho
What is the Ka of a 0.0675 M
solution of carbonic acid
(H2CO3) with a pH of 5.19?
Ka = [ ? ] x 10
Help ASAP
Answer:
The Ka is 6.183 * 10^-10
Explanation:
The first thing to do here is to write the dissolution equation of carbonic acid in water.
H2CO3 + H20 ———> H30+ + HCO3-
After writing this, the next thing is to write the expression for Ka
Mathematically that would be ;
Ka = [H30+][HCO3-]/[H2CO3]
Next thing is to set up an ICE table
ICE table stands for initial, change and equilibrium.
For clarity sake, please check attachment for the ICE table for this chemical reaction
Mathematically by definition;
pH = -log [H3O+]
From the question, we were made to know that the pH is 5.19
Hence;
5.19 = -log [H3O+]
-5.19 = log [H30+]
[H3O+] = 10^-(5.19)
[H3O+] = 6.46 * 10^-6 M
So how does this relate to the ICE table?
From the ICE table, we can see that the equilibrium concentration of the hydroxonium ion equals x.
This means that the equilibrium concentration of the hydroxonium ion [H3O+] , demoted as x = 6.46 * 10^-6 M
Now according to the Ka equation;
Kindly recall that;
Ka = [H30+][HCO3-]/[H2CO3]
Now, using their equilibrium concentrations;
Ka = (x)(x)/(0.0675-x)
Ka= x^2/(0.0675-x)
Kindly substitute 6.46 * 10^-6 for x
Ka = (6.46 * 10^-6)^2/(0.0675-(6.46 * 10^-6)
Ka = 6.183 * 10^-10
Answer:
The answer is actually 6.18x10^-10
Explanation:
Fill in th box 6.18 and -10
Ethane is a member of the hydrocarbon series with the general formula
A) CnH2n+2
B) CnH2n
C) CnH2n–n
D) CnH2n–6
Answer:
A) CnH2n+2
Explanation:
Jonathan is working in his basement on a science fair project when his little sister closes and locks the door. Jonathan wants to let his parents know that he is stuck down in the basement. He can either yell as loudly as he can, bang on the metal pipes, or bang on the concrete wall. Which should he do if he wants someone to hear him? Explain your answer, and explain why the other options would not be as effective.
Answer:
i think its metal pipes
Explanation:
sorry if im wrong
2. Do you think you would have to exercise longer to use the energy that can be released
from three grams of carbohydrate, fat or protein? Why?
A 18 g sample of metal is heated to 96°C and placed in a calorimeter containing 21 g of water at an initial temperature of 24°C. After the metal cools in the water bath, the final temperature inside the calorimeter is 26°C. What is the (positive) specific heat of the metal rounded to the HUNDREDTHS place? (hint: final temperatures of metal and water are the same). Do NOT include units. *
Answer: 140
Explanation:
Given the following :
Mass of metal = 18g = 0.018kg
Mass of water (calorimeter) = 21g = 0.021kg
Initial temperature of metal = 273 + 96 = 369k
Initial temperature of water = 273 + 24 = 297k
Final temperature inside calorimeter = 273 + 26 = 299k
Temperature change of metal = 299 - 369= -70k
Temperature change of water = 299 - 297 = 2k
H = mc ΔT
m = mass
c = specific heat capacity
ΔT = change in temperature
Heat lost by metal = heat gained by water
mc ΔT = mc ΔT
Specific heat capacity of water = 4200
18 * C * ( 299 - 369 ) = 21 * 4.2 * ( 299 - 297)
0.018 × C × -70 = 0.021 × 4.2 × 2
- 1.26 × C = 0.1764
C = 176.4/1.26
C = 140
What characteristic of light determines what color it appears?
Answer:
Light is made up of wavelengths of light, and each wavelength is a particular colour. The colour we see is a result of which wavelengths are reflected back to our eyes. The visible spectrum showing the wavelengths of each of the component colours. The spectrum ranges from dark red at 700 nm to violet at 400 nm.The 'colour' of an object is the wavelengths of light that it reflects. This is determined by the arrangement of electrons in the atoms of that substance that will absorb and re-emit photons of particular energies according to complicated quantum laws.The reason that different waves of light appear to be different colors of light is because the color of a light wave depends on its wavelength. For example, the wavelength of blue light is about 450 nanometers, while the wavelength of red light is about 700 nanometers.
Explanation:
Which of these rocks is most likely to be damaged by acid rain?
Limestone
Granite
Gabbro
the answer is limestone because it is the weakest
How would I get marker and paint off of a wood table without ruining it?
Answer:
get alcohol, and put it on a cloth then wipe it
Explanation:
the medical alcohol btw, not the one you drink lol
idk if it'll work wit paint but for sure with the marker
Answer:
For the marker, if it’s permanent then you should pour a little bit of nail polish remover ON THE STAIN and scrub it off with a paper towel.
For the paint, you can try using paint thinner, but this only works for a wood table that isn’t painted so I wojldnt reccomend that. Idk what to do with the paint tbh. But the first tip for the nail polish definitely works.
are you gay my fellow human being what ever your answer have a good day
Answer:
Yes, i'm gay.
Have a nice day!!
~Narancia
When elements chemically combine with each other, what do they form?
Answer:
Compounds
Explanation:
A compound is a substance formed when two or more elements are chemically joined. (For example Water, salt, and sugar are compounds.) When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.
What type of energy transformation occurs in a campfire?
1.light energy to mechanical energy
2.thermal energy to light energy
3.mechanical energy to chemical energy
4.chemical energy to light and thermal energy
Explanation:
I believe it is number four
What is the sequence of energy transformations that occur in a nuclear reactor? nuclear energy Right arrow. Mechanical energy Right arrow. Thermal energy Right arrow. Electrical energy nuclear energy Right arrow. Thermal energy Right arrow. Mechanical energy Right arrow. Electrical energy thermal energy Right arrow. Nuclear energy Right arrow. Mechanical energy Right arrow. Electrical energy electrical energy Right arrow. Thermal energy Right arrow. Mechanical energy Right arrow. Nuclear energy
Answer:
NUCLEAR ENERGY -----> MECHANICAL ENERGY -------> THERMAL ENERGY --------> ELECTRICAL ENERGY
Explanation:
In nuclear reactor, various energy transformations occur in order to generate electricity. Nuclear reactor converts the energy released from nuclear fission and the heat generated is removed from the reactor by a cooling system where steam is generated. The steam then drives a turbine which powers a generator to produce electricity.
A nuclear reactor is hence an equipment where nuclear chain reactions occur and control can be obtained. The nuclear reactor uses mostly uranium-235 and Plutonium-239. When these radioactive substances absorbs neutrons, they undergo nuclear fission causing the nucleus to split into two or more smaller compounds with the release of kinetic energy a form of mechanical energy, gamma radiations and others.The kinetic energy is then harnessed in the equipment as heat (thermal energy) which is received by a cooling system and steam is generated. The steam can then power the generator from which electricity is obtained (electrical energy).
So therefore, in a nuclear reactor, the nuclear energy is transformed to mechanical energy and then thermal energy which powers the generation of the electrical energy.
Answer:
nuclear energy Right arrow. mechanical energy Right arrow. thermal energy Right arrow. electrical energy or (A)
Explanation:
If you were making S’mores [using a chocolate bar, gram-crackers, and marshmallows] at a campfire, would this process be considered a chemical reaction?
Answer:
The process of making S'more by adding chocolate bar, gram-crackers, and marshmallows in layers is not a chemical reaction
Explanation:
In a chemical reaction, the substances involved in the reaction are known as the reactants and the substances produced have different physical and chemical properties than those of the reactants and they are known as the products.
The bonds that hold the atoms of the reactants are broken down and rearranged, creating entirely new substances as products. Therefore, energy must be added and/or evolved in any chemical reaction and all reactant atoms should be involved in the reaction.
The change in energy can be sensed as heat change such as increase or decrease in the temperature of the products
Since S'more does not involve any of the above changes that occur in a chemical reaction when the chocolate bar, gram-crackers, and marshmallows are put together, it is not a chemical change or a chemical reaction.
how does water affect the growth of a plant?
Answer:
Water transports important nutrients throughout the plant.
Explanation:
Much like blood in an animal, water is necessary for a plants survival, as it transports important nutrients from the soil all through the plant's stems and leaves.
What is the molar ratio of CO2 to C2H2
Which two factors affect the strength of
a metallic bond?
Answer: Number of protons and number of valance electrons.
Explanation:
There are three factors which determine metallic bond strength. greater the no of protons, greater will be attraction between nucleus and valance shell electrons and stronger will be metallic bond. greater no of valance electron, greater will be attractions between nucleus and electrons and stronger will be bond.
Help haha Hahahahaha
Answer:
284.395332
Explanation:
1 mole= 36.46094
so multiply 36.46094 times 7.8
and you get 284.395332
hope that helped ! Please mark brainliest I only need one more.
define the term acid
Answer:
An acid is simply a molecule or a chemical which gives hydrogen ions while mixed or reacted with water
let me know the answer to this oneeee
1.2 moles of hydrogen
please see the attached picture
hope it helps
Good luck on your assignment
What natural resources, if any, were discovered or developed over time in Dublin?
Answer:
Resources and power
Discoveries of silver, lead, zinc, and gypsum have been successfully developed, but the country's dependence on imports for its energy requirements is high. In the early 1980s offshore natural gas wells began production in the Celtic Sea south of County Cork.
Explanation:
The primary natural resources of the Republic of Ireland include natural gas, petroleum, peat, copper, lead, dolomite, barite, limestone, gypsum, silver and zinc. Key industries based on these and other natural resources include fishing, mining, and various forms of agriculture and fish farming.
how much air in tons do you think there is in a normal sized bedroom whoever gets the closest will be marked as the brainiest :)
Answer:
get a little more than that is a great deal for the company and inventor of a company how can we get u a great job with their best friend in a few months but il will send you i will be the only person I know of fishes and the best I have to ask me to make it to my own home wifi and I am grade up to the same thing and the same way of the American people I have a lot to make a simple one person
