Answer:
The main difference between the heat of formation and heat of reaction is that heat of formation is the amount of energy either absorbed or released during the formation of a compound whereas heat of reaction is the amount of energy either absorbed or released during any chemical reaction.
Explain the significance of groups and periods on the periodic table
A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. ... A group is a vertical column of the periodic table, based on the organization of the outer shell electrons. There are a total of 18 groups.
rusting of steel can be prevented by coating the steel with a layer of zinc. Explain, in terms of electron transfer, why steal does not rust even if the layer of zinc is scratched so that the steal is exposed to air and water.
Answer:
Wouldn't rust because zinc will lose electrons more readily than iron and will therefore oxidize first.
Explanation:
This process whereby rusting of steel is prevented by coating the steel with a layer of zinc is known as galvanization.
Now, in this process, the steel object will be coated in a thin layer of zinc. This coating will prevent oxygen and water from reaching the underneath metal since the zinc will also act as a sacrificial metal.
Now, Zinc is used because it has a lower reduction potential than iron and thus it will get easily more oxidized than iron. Which means the zinc will lose electrons more readily than iron.
Also, since zinc has a lower reduction potential, it is therefore the more active metal. Thus, even if the zinc coating is scratched and the steel is exposed to moist air, the zinc will still get to oxidize before the iron.
What would be the volume, in liters measured at STP, of 0.56 moles of carbon monoxide?
Answer:
"This conversions relies on the fact that a mole of gas at STP has a volume of 22.4 L. It is important to note, however, that if the conditions of the gas are different this conversion will NOT work. Under those conditions you must use the ideal gas law to convert between moles and liters."
How can nuclear energy be used in medicine
Energy is the ability to A. use gravity.B. hold objects. C. cause change
Answer:
C
Explanation:
Hope this Helps, If it doesn't comment, and I will make my best effort to change it. :)
A chemist has 3.55x1022 molecules of nitrogen monoxide. How
many moles of nitrogen monoxide does the chemist have?
Answer:
0.059 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.55 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.05897...[/tex]
We have the final answer as
0.059 molesHope this helps you
Pls Help pls pls pls answer all the questions like this
1. your answer
2. your answer
3. your answer
FAST PLS I NEED AN 100%!!!!
Answer:
a person walking, a thrown baseball, a crumb falling from a table---- kinetic energyA raised weight.,Water that is behind a dam,A car that is parked at the top of a hill.----potential energy
The second law of thermodynamics is a physical law based on universal experience concerning heat and energy interconversions.
How far does sound travel in air at 20ºC in 5 seconds?
Answer:
well, the speed is 343 m/s at 20 degrees Celsius
distance=speed*time
=343m/s *5s
=1715m
Why is it important to have a boiling chip present in the boiling flask when distilling liquid mixtures?.
Answer:
they will prevent superheating of the liquid being distilled and they will cause a more controlled boil, eliminating the possibility that the liquid in the distillation flask will bump into the condenser.
Explanation:
hope this helps :3
What is the emf produced in a 1.5 meter wire moving at a speed of 6.2 meters/second perpendicular to a magnetic field of strength 3.96 × 10-3 newtons/amp·meter ?
A. 37 volts
B. 0.0026 volts
C. 5.0 volts
D. 0.37 volts
E. 0.037 volts
Answer:
0.037 volts
Explanation:
What is the name of cells that have the ability to develop into different
kinds of cells?
Answer:
stem cells
Explanation:
hope it helps
Help me find how many moles
Answer:
H 13.8mol CO2
Explanation:
we know that per 1 mol there is 6.022x10^23 molecules
so divide 8.23x10^22/ AVG # ( # above) we get 13.8mol of CO2 not to be confused with A
Which subatomic particle gains energy from the flame and then loses it in the form of light?
Answer:fire?
Explanation: it gains heat from heat/friction, and losses it if its been lighted up for too long (it can be used as light)
Which is the best example of a pure substance?
gold
air
peanuts
milk
Peanuts, or milk please leave like if right
Answer:
air
Explanation:
A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
Name the chief allotopes of sulphur.How would you show that all the allotropes of sulphur consist of only sulphur?
Answer:
.
Explanation:
True or False:
Rain is the only form of precipitation that this pollutant takes.
Answer:
I’m not sure probably false
Explanation:
Name two elements whose outer energy levels are complete with two electrons
Answer:
ppsuck
Explanation:
f;lhfadlkahglkaga
Object A and B have the same mass. Which object is experiencing a stronger gravitational force?
A). Object A, because shorter distance between objects results in a stronger gravitational force
B). Object B, because longer distance between objects will result in a stronger gravitational force
C). They experience the same gravitational force
ide appreciate if someone would help me with these.
Answer:
can't do much
Explanation:
baking soda;8,alkaline
bleach:12,alkaline.
coffee:5.10,acidic
coke;coke,acidic
milk;6.9,acidic.
lemon juice;2,acidic
this is all i can do.
What elements makeup Mars' atmosphere?
Answer:
Carbon dioxide or co^2
Explanation:
burning wood is an example of ___ energy
Answer:
burning wood is an example of kinetic energy.
Explanation:
because when the wood is burning it is releasing the stored energy.
hope this answer will help you
have a great time
highly selective production of syngas from chemical looping reforming of methane with co2 utilization on mgo-supported calcium ferrite redox materials
An appealing technique called chemical looping reforming with CO2 splitting (CLRS) can be utilised to transform hydrocarbons into syngas, an essential industrial intermediate that can be used as a raw material for other products with added value. The partial oxidation of methane occurs using the oxygen carrier that supplies lattice oxygen, not molecular oxygen, according to the chemical looping method.
What is Syngas ?Syngas is flammable and usable as fuel. In the past, it has been used to replace gasoline when supplies are scarce; for instance, wood gas was utilised to power automobiles in Europe during World War II (in Germany alone half a million cars were built or rebuilt to run on wood gas).
Either waste materials (carbon-based) are pyrolyzed or plant biomass is gasified to produce syngas. The production of Syngas is theoretically possible from any hydrocarbon feedstock. Internal combustion engines' combustion process is mostly affected.Learn more about Syngas here:
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A 34.0 g piece of metal is heated to 92.0°C then placed in a beaker of water containing 22.0 g of water at 19.0°C. The temperature of the water rises to 24.0°C. What is the specific heat of the metal?
Answer:
0.1988 J/g°C
Explanation:
-Qmetal = Qwater
Q = mc∆T
Where;
Q = amount of heat
m = mass of substance
c = specific heat of substance
∆T = change in temperature
Hence;
-{mc∆T} of metal = {mc∆T} of water
From the information provided in this question, For water; m= 22.0g, ∆T = (24°C-19°C), c = 4.18J/g°C.
For metal; m= 34.0g, ∆T = (24°C-92°C), c = ?
Note that, the final temperature of water and the metal = 24°C
-{34 × c × (24°C-92°C)} = 22 × 4.18 × (24°C-19°C)
-{34 × c × (-68°C)} = 459.8
-{34 × c × -68} = 459.8
-{-2312c} = 459.8
+2312c = 459.8
c = 459.8/2312
c = 0.1988
The specific heat capacity of the metal is 0.1988 J/g°C
40 POINTS PLS HELP!
1. A description of what genetically modified foods are.
2. A list of crops that are typically genetically modified.
3. An explanation of why crops are genetically modified.
4. A description of how crops are genetically modified.
5. A list of how genetically modified crops affect society and the environment.
___________________________________
Same as top but these are questions:
1. What are genetically modified foods?
2. What crops are typically genetically modified?
3. Why are crops genetically modified.
4. How are crops genetically modified?
5. how do genetically modified foods affect society in the environment.
___________________________________
And PLS, don't use this just for points!
Thank you!
Answer:
1. Foods that have changes that are chemically introduced.
2. corn soybeans apples etc
3. sot they last longer or look better
4. new dna is placed in them and their seeds
5. they are not as good for humans
Explanation:
Please fine the volume please please please need asap
Answer:
64.2
Explanation:
2.8+17.8+13.7+8+21.9 = 64.2
Contrast exo. and endothermic reactions and give an example for each?
Answer:
Explanation:
Endothermic reactions:
The type of reactions in which energy is absorbed are called endothermic reactions.
In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.
For example:
C + H₂O → CO + H₂
ΔH = +131 kj/mol
it can be written as,
C + H₂O + 131 kj/mol → CO + H₂
Exothermic reaction:
The type of reactions in which energy is released are called exothermic reactions.
In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.
For example:
Chemical equation:
C + O₂ → CO₂
ΔH = -393 Kj/mol
it can be written as,
C + O₂ → CO₂ + 393 Kj/mol
why do my teacher's overload me with work?
Answer:
for you to get smarter
Explanation:
Why teachers give lots of work:
They teach you new things you may not have known before
They teach you to think.
They teach you to be curious about things you didn’t know you wanted to know.
They try and teach you the reason you should love learning.
They teach you about different perspectives in our world.
They teach you how mistakes can be learned from.
They teach you how to take turns.
They teach you respect.
They teach you about the world - one that is outside your house, town, state, continent, and most of your mind.
They show you books you would never pick up on your own.
They teach you the how, who, what, why, where, and when.
They teach you the importance of communication.
They teach you how to get along with others - even those you don’t like.
They teach you to share.
They teach you patience.
They teach you compassion.
These are only a few things a good teacher will teach you. Some you will learn in a year and other things take several years and several teachers.
Which element will gain one electron in an ionic bond?
Select one:
a. Al
b. Cu
c. Br
d. O
Answer:
C. Bromine
Explanation:In ionic bond , the metals looses electron and the non metal gains electron.
In the given options ;
Aluminum (Al)= METAL
Copper (Cu) = METAL
Bromine (Br) = NON METAL
Oxygen (O) = NON METAL
That leaves us with bromine and oxygen.
Oxygen has an electronic configuration of 2,6.(see image).
So oxygen needs to gain two electrons.
Bromine has one valence electron ( see image).
So therefore , Bromine needs to gain one electron as It is in Group VII
A certain compound is made up of two bromine atoms, one nitrogen atom, and one chlorine atom. What is the chemical formula of this compound?.
The chemical formula of this compound is NBr₂Cl.
A chemical formula shows the elements in a compound and the relative proportions of those elements.
The name of this compound is N,N-dibromochloroamine.
Molar mass of the compound NBr₂Cl is 209.26 g/mol.
Nitrogen is the central atom in this compound (see the picture below).
Electron configuration for nitrogen: ₇N 1s² 2s² 2p³.
Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.
Electron configuration of bromine: ₃₅Br 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵.
Nitrogen is in group 15 of Periodic table of elements and his atomic number is seven, which means that nitrogen has seven electrons.
More about chemical formula: brainly.com/question/11574373
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When an atom of sodium and an atom of fluorine
combine to form the salt, sodium fluoride, an
ionic bond, is formed. Which statement correctly
describes the behavior of the valence electron in
the ionic bond?
A. An electron from the fluorine atom moves to
the sodium atom forming two ions.
B.
An electron from the sodium atom moves to
the fluorine atom forming two ions.
C. An electron from the fluorine atom is shared
with the sodium atom forming a sodium ion.
D. An electron from the sodium atom is shared
with the fluorine atom forming a fluoride ion.
Answer:
B. An electron from the sodium atom moves to the fluorine atom forming two ions.
Explanation:
In forming this ionic compound NaF, an electron is transferred from the sodium atom to the fluorine atom and two ions are formed.
This is the mechanism of forming ionic or electrovalent bonds. Every atom desires to have the configuration of noble gases. When a metal and non - metal approaches one another, the electronegative specie prefer to get electrons to complete its octet. The electropositive metal will prefer to lose electrons. In the case of NaF, Na will lose an electron to become isoelectronic with Ne. Fluorine gains the electron and becomes isoelectronic with ArTwo ions the attracts one another with an electrostatic force will now form.A branch of science which deals with the study of chemicals is called chemistry.
The correct answer to the question is B.
The reaction between the acid and base is called a neutralization reaction and forms the salt.
Salt is an ionic compound in which cation and anion joined together to form a compound. In an ionic compound, one element gives electrons to the other element to complete the outer shell and make a bond. In the question, sodium has more electrons and gives them to fluorine.
Hence, the correct option is B that is An electron from the sodium atom moves to the fluorine atom forming two ions.
For more information, refer to the link:-
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