Balance the equation using the
correct coefficient:
lithium + water produces lithium
hydroxide + hydrogen gas
[ ? ]Li + 2H2O → LiOH + H2
Enter
Answer:
[tex]2\; {\rm Li} + 2\; {\rm H_{2} O} \to 2\; {\rm LiOH} + 1\; {\rm H_{2}}[/tex].
Explanation:
Assume that the coefficient of [tex]{\rm LiOH}[/tex] is [tex]1[/tex]:
[tex]?\; {\rm Li} + ?\; {\rm H_{2} O} \to 1\; {\rm LiOH} + ?\; {\rm H_{2}}[/tex].
The product side of this equation would include:
[tex]1[/tex] [tex]{\rm Li[/tex] atom.[tex]1[/tex] [tex]{\rm O}[/tex] atom.The number of [tex]{\rm H}[/tex] atoms on the product side is not known since the coefficient of [tex]{\rm H_{2}}[/tex] is not yet found.By the conservation of atoms, the reactant side of this equation should also include:
[tex]1[/tex] [tex]{\rm Li}[/tex] atom, and[tex]1[/tex] [tex]{\rm O}[/tex] atom.The only reactant that includes [tex]{\rm Li}[/tex] atoms is [tex]{\rm Li}\![/tex]. Thus, the coefficient of the reactant [tex]\!{\rm Li}[/tex] should be [tex]1[/tex] to ensure that the reactant side of this equation includes exactly [tex]1\![/tex] [tex]{\rm Li}\!\![/tex] atom.
Likewise, the only reactant that includes [tex]{\rm O}[/tex] atoms is [tex]{\rm H_{2}O}[/tex], with one [tex]{\rm O}\![/tex] atom in each formula unit of [tex]{\rm H_{2}O}\![/tex]. There needs to be [tex]1\![/tex] [tex]\!{\rm O}[/tex] atom on the reactant side of this equation. Therefore, the coefficient of the reactant [tex]{\rm H_{2}O}\!\![/tex] should also be [tex]1[/tex]:
[tex]1\; {\rm Li} + 1\; {\rm H_{2} O} \to 1\; {\rm LiOH} + ?\; {\rm H_{2}}[/tex].
The reactant side of this equation now include:
[tex]1[/tex] [tex]{\rm Li}[/tex] atom.[tex]1[/tex] [tex]{\rm O}[/tex] atom.[tex]2[/tex] [tex]{\rm H}[/tex] atoms.By the conservation of atoms, the product side of this equation should also include:
[tex]1[/tex] [tex]{\rm Li}[/tex] atom.[tex]1[/tex] [tex]{\rm O}[/tex] atom.[tex]2[/tex] [tex]{\rm H}[/tex] atoms.The product [tex]1\; {\rm LiOH}[/tex] alone would account for [tex]1\; {\rm Li}[/tex] atom, [tex]1\; {\rm O}[/tex] atom, and [tex]1\; {\rm H}[/tex] atom. Thus, there would be only [tex]1[/tex] more [tex]{\rm H}[/tex] atom for the other product, [tex]{\rm H_{2}}[/tex]. However, since there are [tex]2[/tex] [tex]{\rm H}\![/tex] atoms in every formula unit of [tex]{\rm H_{2}}\![/tex], the coefficient of [tex]\!{\rm H_{2}}[/tex] would need to be [tex](1/2)[/tex]:
[tex]1\; {\rm Li} + 1\; {\rm H_{2} O} \to 1\; {\rm LiOH} + (1/2)\; {\rm H_{2}}[/tex].
Atoms of each element are indeed conserved in this equation.
Eliminate the fractions by multiplying all coefficients by [tex]2[/tex] (least common denominator of all coefficients in this equation):
[tex]2\; {\rm Li} + 2\; {\rm H_{2} O} \to 2\; {\rm LiOH} + 1\; {\rm H_{2}}[/tex].
A food web is
a. many food chains linked together
b. a web with only one food chain
c. a simple food chain
Answer: A
Explanation:
A food web is just a bigger picture idea and more complex version of a food chain.
Answer:
a. many food chains linked together
Explanation:
A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem.
200 ml. of C2 H4 is burnt in just sufficient air (containing 20% oxygen) as per the equation - C2H4 + 3O2→2CO2 + 2H2O
calculate the resultant mixture composition.
(at 100 degree centigrade and constant press)
Explanation:
Hope it helps you !!is math involved in basketball? and how?
Answer:
yes
Explanation:
math is used constantly to improve one's performance. Achieving the objective of shooting a basketball includes using percentages and angles. By finding the most consistent percentage of shots made while using a certain angle, you can find out which player will score the most baskets.
According to Avogadro's law, why does the volume of a gas need to increase as the number of particles increases in order to maintain a constant
pressure?
1. How many grams of magnesium fluoride can be obtained when 0.235 g of magnesium reacts with
excess of cobalt (II) fluoride?
Mg (s) + CoF, (aq) → MgF₂ (aq) + Co (s)
Answer:
10g
Explanation:
PLEASE HELP IM TAKING A TEST!!! Consider the reaction 4FeS2 + 11O2 → 2Fe2O3 + 8SO2. If 8 moles of FeS2 react with 15 moles of O2, what is the limiting reactant?
a
FeS2
b
Fe2O3
c
O2
d
SO2
Answer:
c-)O2
Explanation:
in an aerosol spray can with a volume of 456 ml contains is 3.18g of propane gas as a propellant If the can is at 23° C and 50 ATM what volume will be the propane occupy at STP
Answer: Answer:
21.03L
Explanation:
V1 = 456mL = 0.456L
T1 = 23°C = (23 + 273.15)K = 296.15K
P1 = 50atm
V2 = ?
T2 = 273.15K
P2 = 1.0atm
Note : P2 and T2 are at STP which are 1.0atm and 273.15K
To find V2, we have to use the combined gas equation,
(P1 × V1) / T1 = (P2 × V2) / T2
P1 × V1 × T2 = P2 × V2 × T1
V2 = (P1 × V1 × T2) / (P2 × T1)
V2 = (50 × 0.456 × 273.15) / (1.0 × 296.15)
V2 = 6227.82 / 296.15
V2 = 21.029L
Final volume of the gas is 21.03L
Explanation:
Show how you would prepare a 0.1 M solution of potassium hydroxide with .0025 moles of potassium hydroxide.
Show all work !
Answer:
0.025 L KOH
Explanation:
Because you gave molarity and moles, I am assuming that you are looking for volume via the molarity equation. I simply plugged the given values into the molarity equation and rearranged to isolate the liters variable.
Molarity (M): 0.1 M
Moles: 0.0025 moles
Volume (L): ? L
Molarity (M) = moles / liters (L)
0.1 M KOH = (0.0025 moles KOH) / (? L KOH)
(0.1 M KOH) x (? L KOH) = 0.0025 moles KOH
? L KOH = (0.0025 moles KOH) / (0.1 M KOH)
? L KOH = 0.025 L KOH
Which form of decay produces a nucleus similar to the element helium? alpha particle beta particle gamma ray
Answer:
ALPHA
Explanation:
Liquid Ethyl Alcohol has a specific heat capacity of 2. 40J/g*C. Calculate the heat change that would take place as 25. 7 of liquid Ethyl alcohol are cooled from 55. 2C to 30 C
Taking into account the definition of calorimetry, the heat change that would take place as 25.7 g of liquid Ethyl alcohol are cooled from 55.2 °C to 30 °C is -1554.336 J.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
Heat changeIn this case, you know:
Mass= 25.7 gInitial temperature= 55.2 °CFinal temperature= 30 ºCSpecific heat= 2.40 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
Q= 2.40 [tex]\frac{J}{gC}[/tex]× 25.7 g× (30 °C - 55.2 °C)
Solving:
Q= -1554.336 J
Finally, the heat change that would take place as 25.7 g of liquid Ethyl alcohol are cooled from 55.2 °C to 30 °C is -1554.336 J.
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What Scientist presented the theory of Continental Drift?
A.Albert Einstein
B.Sir Isaac Neutron
C.Henry Ford
D.Alfred Wegener
Answer:
d
Explanation:
Alfred Wegener was the one who proposed the idea although he wasn't believed until after he died
The scientist who presented the theory of Continental Drift is Alfred Wegener. The correct option is D.
What was continental drift theory?The continental drift idea provided an explanation for why the continents had moved from their original places. Once linked as a single entity, called a "Subcontinent."
Since continental rocks are too light to sink to the ocean floor, the common belief that mountains were to blame for their sinking was later disproved.
Alfred Lothar Wegener is a climatologist. He discovered the continental drift theory. The science of plate tectonics has now supplanted the theory of continental drift. The scientist Alfred Wegener is most closely identified with the hypothesis of continental drift. He referred to it as continental drift.
Therefore, the correct option is D. Alfred Wegener.
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How can energy change during a chemical reaction?
A. Change in the mass of the reactants or thermal energy.
B. Increase in heat and/or destruction of matter.
C. Transfer of heat and/or work.
D. Increase or decrease in total energy of a system.
Answer:
I think the answer would be C because energy is only transferred.
Explanation:
Hope this helps:)....if it's wrong then sorry for wasting your time and may God bless you:)
What is the concentration of a solution made by diluting 55 mL of 6.0 M HCl to a final volume of 750 mL
Answer: Ernest Z. The concentration would be 0.76 mol/L.
if the pH of a solution is 7, what is the pOH?
If the pH of a solution is 7, the pOH of the solution will be 7.
What is pOH?The concentration of the hydroxide ion (OH-) in a solution is measured by pOH.
This is a fundamental equation to calculate the pH and pOH.
pOH = 14 - ph
The pH is given 7
Putting the value of pH in the formula
pOH = 14 - 7 = 7
Thus, the pOH will be 7, if the pH of a solution is 7.
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1. Why is it a problem that most black-footed ferrets today are closely related?
A. They can no longer reproduce
B. They are more likely to get sick from the same diseases
C. They can be raised only in captivity
D. They no longer know how to hunt on their own
PLS HELP ASAP!!!
Answer:
they are more likely to get sick from the same disease
Black-footed ferrets are the most endangered mammal of North America. The problem that most black-footed ferrets today are closely related because they are more likely to get sick from the same diseases.
What are endangered species?An endangered species are the species that can become extinct in the future, either worldwide.
The problem of the black-footed ferrets today are closely related is that they are more likely to get sick from the same diseases.
Thus, the correct option is C.
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a boulder of shore is slowly broken apart by the force of the water it is a change or it is a example
Answer:
I think that this would be an example of erosion
Does anyone know Bible thing cuz I don’t know what to write and I need help if you know this ok
I answered all of them except 2 for you to do
Hope this helps :))
how is chemistry used daily for gynecologist? examples
Answer:
Chemistry plays a large role in obstetrics and gynecology. For instance, urinalysis requires an understanding of bilirubin levels and their conjugation with glucuronic acid to create a compound that is water soluble. This is passed through the blood stream and urinary system to create urobilirubin.
Explanation:
Please help me with this
Explanation:
This is not accurate because you cannot hear sound in space, you would most likely hear a giant explosion since that is what is happening in the movie I guess, they just added the sound to make the movie more appealing to watch, this isn't really what would happen in space. if anything you would just see the explosion and not be able to hear it at all. SOUND DOESNT TRAVEL IN SPACE.
When you normally go to Dunkin Donuts you order a large coffee with Two Sugars which is really sweet and just how you like it today was really hot out so you decided to get a large iced coffee. Explain why the large iced coffee doesn't taste as sweet as you like it even though you added two sugar packets to it.
Answer:
I thank it is because of the cold It doesn't really taste sweet because the temperature is lower hence the sugar does not dissolve properly.
Dissolution of a solute
Fill in the following table.
Answer:
i cant see the photo but i would love to help
Explanation:
Giving brainliest, please HELP!
Answer:
- 65 kJ
Explanation:
Hess's Law of Constant Heat Summation (or just Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes
A+2B + B + 2C ===> C +D + 2C+ D
-20kJ -45 kJ ===> 3C + 2D
-65 kJ
Name the process that allows more reactive metals to be obtained from their ores
Answer:
The process of obtaining metals from their ores is called metallurgy . The process employed in getting the ore depends on the nature of the ore and the impurities present in it.
The ore in which they are found depends on their reactivity. For example,reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide
Give a full note on Global warming
Answer:
Global warming is a gradual increase in the earth's temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.
Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.
Since the pre-industrial period, human activities are estimated to possess increased Earth’s global average temperature by about 1 degree Centigrade (1.8 degrees Fahrenheit), variety that's currently increasing by 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade. Most of the present warming trend is extremely likely (greater than 95 percent probability) the results of act since the 1950s and is proceeding at an unprecedented rate over decades to millennia.
Climate change may be a long-term change within the average weather patterns that have come to define Earth’s local, regional and global climates. These changes have a broad range of observed effects that are synonymous with the term.
Global warming occurs when CO2 and other air pollutants and greenhouse gases collect within the atmosphere and absorb sunlight and radiation that have bounced off the earth’s surface.
Normally, this radiation would escape into space — but these pollutants, which may last for years to centuries within the atmosphere, trap the warmth and cause the earth to urge hotter. That's what's referred to as the atmospheric phenomenon.
Melting glaciers, early snowmelt, and severe droughts will cause more dramatic water shortages and increase the danger of wildfires. Rising sea levels will cause coastal flooding on the Eastern Seaboard, especially in Florida, and in other areas.
Forests, farms, and cities will face troublesome new pests, heat waves, heavy downpours, and increased flooding. All those factors will damage or destroy agriculture and fisheries. Disruption of habitats like coral reefs and Alpine meadows could drive many plant and animal species to extinction.
~ extracted from Global warming documentary.
Climate change encompasses not only rising average temperatures but also extreme weather events, shifting wildlife populations and habitats, rising seas, and a variety of other impacts. All of these changes are emerging as humans still add heat-trapping greenhouse gases to the atmosphere, changing the rhythms of climate that each one living things have come to believe.
How can the concentration of a solution be expressed quantitatively?.
The concentration can be expressed as the quotient between the masses.
How to express the concentration?We define the concentration (of something) in a solution, as the amount of that thing that there is in the solution.
With that in mind, the concentration can be defined by the quotient between the mass of the particular thing and the mass of the solution.
For example, in a mix of water and salt, the concentration of salt would be given by the quotient between the mass of salt and the total mass of the mix.
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In Beaker A, 2.0 grams of zinc powder is mixed with 1.0 M hydrochloric acid. In Beaker B, 2.0 grams of zinc powder is mixed with 6.0 M hydrochloric acid. In which beaker will the reaction occur faster
In Beaker A, 2.0 grams of zinc powder is mixed with 1.0 M HCl acid & in Beaker B, 2.0 grams of zinc powder is mixed with 6.0 M HCl acid so in beaker B reaction occur faster.
What is rate of reaction?Rate of reaction of any chemical reaction gives idea about the speed of the completion of the given reaction, and rate of reaction is directly proportional to the concentration of the reactant species.
If the concentration of reactants increases then the rate of the reaction also increases. According to the question concentration of zinc powder is same in both beakers.
In beaker A, concentration of HCl is 1M and in Beaker B is 6M respectively so the rate of reaction is faster in beaker B.
Hence in beaker B reaction occur faster.
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C. Energy/amu for proton-proton is 0.36 and for fission it is 0.85106383.
D. Based on my work from C, does fission or fusion release the most energy per amu?
The fission reaction released the most energy per amu when compared to the fusion reaction.
Energy released per amu for FusionThe amount of energy released per amu for fusion is given as 0.36 J/amu.
Energy released per amu for FissionThe amount of energy released per amu for fission is given as 0.85106383 J/amu.
From the different energy released per amu, it is obvious that 0.85106383 J/amu is greater than 0.36 J/amu.
Thus, the fission reaction released the most energy per amu when compared to the fusion reaction.
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calculate the pressure exerted by 66.0 g of CO2
Answer:
The pressure exerted by 66.0 g of CO₂ gas at -14.5°C that occupies a volume of 50.0 L is 0.636 atm.
How do we calculate pressure?
Pressure of any gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure of gas = ?
V = volume of gas = 50L
R = universal gas constant = 0.082 L.atm/K.mol
T = temperature of gas = -14.5°C = 258.65 K
n is moles of gas and it will be calculated as:
n = W/M, where
W = given mass of CO₂ = 66g
M = molar mass of CO₂ = 44 g/mol
n = 66/44 = 1.5 moles
On putting values we get
P = (1.5)(0.082)(258.65) / (50)
P = 0.636 atm
Hence required pressure is 0.636 atm.
Explanation:
Hope This Helps
Have A Great Day
~Zero~
The reaction below was carried out in an acidic solution. upper i minus, plus upper i upper o minus subscript 3 right arrow upper i subscript 2. which statement is true about this equation? although it is unbalanced, it can be balanced by using the half-reaction method. it has been balanced by using the half-reaction method. it has been balanced by directly using spectator ions. although it is unbalanced, it can be balanced by directly using spectator ions.
The reaction is an unbalanced redox reaction hence, the reaction can be balanced by using the half-reaction method.
What is a redox reaction?The term redox reaction refers to the reactionnin which electrons are transferred hence one specie is oxidized while the other specie is reduced.
Looking at the reation as shown, we can see that the reaction is an unbalanced redox reaction hence, the reaction can be balanced by using the half-reaction method.
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Answer:
B
Explanation: