Yes the main benifit can be recyclation of energy
The example can be seen in powerbanks or invertersThe chemical energy present inside the battery can be used to convert itself into electric energy.Which can help us in climate protectionWhat mass of H₂ is required to produce 2 moles of NH3?
Answer: RATIOS IN TERMS OF MOLES
Solution: Solution According to the balanced equation, 2 moles of NH3 are produced when 3 moles of H2 react.
The mass of the door handle is 140 g, and 10 % of its mass is copper. How many *
MOLES of copper does the handle contain?
0.22 moles
Explanation:Moles are a measurement used in chemistry that describes the amount of an atom based on the number of atoms. One mole is equal to [tex]6.022*10^{23}[/tex], which is the number of atoms in 12 grams in Carbon-12.
Mass of Copper
Before finding the moles of copper, we need to know the mass. We are told that a door handle is 140g, but only 10% is copper.
To find 10% for 140 we can multiply 140 * 0.1.
140 * 0.1 = 14This means there are 14 grams of copper.
Moles of Copper
Now, we can use dimensional analysis to convert grams to moles. To do this we need to know how many grams of copper are in 1 mole. This number is called the molecular mass and can be found on the periodic table. This number is usually directly below the element's symbol and is the only number with decimal points (not all periodic tables will have the exact same molecular mass because the number can change, but they will be close).
The molecular mass for copper is 63.55. Next, we can set up a dimensional analysis conversion. Dimensional analysis is when you multiply some value by a ratio of 2 different values with 2 different units. This may sound confusing but it makes more sense when you do it.
[tex]14 g*\frac{1 mole}{63.55g}[/tex]When setting up an expression like this, make sure that the units cancel out so you are only left with the one you want. Units will cancel out if one is in the numerator of a ratio and the other is in the denominator.
Next, multiply this out (which is equivalent to dividing 14/63.55)
[tex]14 g*\frac{1 mole}{63.55g} = 0.22 moles[/tex]So, when rounded to significant figures, there are 0.22 moles in 14 grams of copper.
Write two equations for the neutralization of nitric acid, HNO, with magnesium hydroxide, Mg(OH). In the first equation, include the spectator ions. In the second, do not include the spectator ions.
Answer:
where the formula
Explanation:
Answer:
Explanation:
Your answer should include the total ionic equation (for the equation with spectator ions) and net ionic equation (for equation that does not include spectator ion).
ignore the top equation labelled molecular equation
Disclaimer: the solid MgOH2 works only for Mg(OH)2 in solid phase.
If we assume the Mg(OH)2 is aqueous, then I have attached a second picture (replace Ca with Mg), the boxed equations are your answers.
Turns Red Litmus paper to BLUE (Blue stays BLUE)
A.) calcium chloride
B.) citric acid
C.) glucose
D.) calcium hydroxide
Determine the molarity of a solution with a volume of 437. mL and 0.590 mol of
solute dissolved.
Answer:
Answer:
= 1.35M
Explanation:
data:
volume = 437ml
= 437 /1000
= 0.437dm^3
no. of moles = 0.590 moles
solution:
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.590 / 0.437
molarity = 1.35M
Why are prefixes often added to si units
Answer:
b
Explanation:
b
Which inner planet has 2 moons? Question 2 options: Mercury Venus Earth Mars
Answer:
Mars
Explanation:
neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons
PLEASE HURRY What is one technology that has contributed to human population growth in the past that could hinder it in the future? How will this happen?
Answer:
Factories because they have helped with producing goods faster but in the meanwhile, our future will slowly get warmer.
Explanation:
B2
N
Which form of energy is a type of
potential and kinetic energy?.
a) Mechanical
b) Chemical
c) Electrical
d) Nuclear
Answer:
electrical
Explanation:
because since electricity moves thus giving us kinetic energy and it also stores energy giving is potential energy
Heat from a fire place is transferred out to the room it How does the heat from the fire place transfer out to the room?
differentiate between positive and negative deviation ~
[tex] \\ [/tex]
ty! :)
Answer:
positive deviation from raoults law means when the vapour pressure is higher than the solution is expected to exhibit e.g of one is the mixture of acetone and ethanol
negative deviation means that it is opposed to the total vapour pressure of the solution
Which has a higher metallic character?
A)Lithium
B)calcium
Please explain your answer
Answer:
Lithium
Explanation:
lithium because metallic character decreases down the group and lithium comes before in group then calcium
Below is a symbol block from the periodic table. What does the number 6 indicate?
Answer:
Carbon And the number of protons
What is an average? What is the formula to calculate an average? science
Answer:
A average is a number expressing the central or typical value in a set of data. add up all the numbers, then divide by how many numbers there are.
Explanation:
Using the periodic table, which of the elements below would be a poor conductor of electricity, be a gas, and may have a color?
a. Zinc
b. Cobalt
c. Chlorine
d. Calcium
Define the term pH in acid and base
Answer:
a measure of how acidic/base water is.
Explanation:
hope it's helpful (◕ᴗ◕✿)
Meaning of metamerism and give an example
Answer:
In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.
Explanation:
In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.
examples
diethyl ether and methyl propyl ethers are metamers.
Are cable wires made of thermoplastic? If so why?
(This is just a doubt that just came into my head)
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Cable wires are usually made of of thermoplastics because, current passing through the wire has heating effects as well, due to collision of electrons in the conducting wire. so to avoid the melting of normal wire which can break the circuit, Thermoplastics are used, that doesn't have much effect of heat on them.
A chemist prepares a standard solution in the lab using a 500.0 mL volumetric flask. 4.865 g of NaCl is used. What is the molarity of the NaCl solution?
[tex]\huge \underbrace \mathfrak{Answer}[/tex]
0.17 mol/l
Explanation:
⠀
⠀
⠀⠀⠀⠀▨ Note⠀
What is molarity?Molarity is the amount of moles of component present in certain volume of solution.
⠀
What is mole?Mole is a unit in chemistry i.e. 6.022×10²³ ions, atoms or molecules present in the substance.
⠀
⠀
⠀⠀⠀⠀● Solution⠀
Weight of NaCl(m) = 4.865 grams
Volume(V) = 500ml = 0.5 liters
⠀
1 mole of NaCl = 58g
So 4.865g of NaCl(n)
[tex] = \sf \frac{4.865}{58} = 0.084 \: moles[/tex]
⠀
While
[tex] \frak{molarity = \frac{no \: of \: moles}{volume} } [/tex]
⠀
Substituting the required values
⠀
[tex] \sf \implies molarity = \frac{n}{V} \\ \\ \sf \implies molarity = \frac{0.084}{0.5} \\ \\ \ \boxed{ \tt{ \implies molarity = 0.17 \: mol \: {l}^{ - 1} }}[/tex]
1.consider the following overall reaction 6 CL + 2 AU³ → 3C L₂(g) + 2 AU (s)
(I) write down the cell notation for the cell
(i) Construct a fully labelled Galvanic cell for the reaction given above
Answer:
AU(s)| AU³||CL,Cl2|Pt(s)
Explanation:
I started with the anode on my left hand side because AU id undergoing oxidation and on the right hand side CL is undergoing reduction hence it's a cathode, and since for the cathode we don't have a metal in a solid state we are going to add Pt
Step 4: Summarize nuclear changes.
a) Use your completed table and models to write a summary that addresses the following questions:
1. How does energy change in these reactions? Is energy needed to start the reactions or is energy given off in the reactions? For each type of reaction, approximately how much
energy is released?
2. How do these energy changes compare in scale to other types of reactions, such as chemical reactions?
Nuclear changes involves changes in the composition of the nucleus of atoms with the release of large amounts of energy.
What are nuclear changes?Nuclear changes are changes which occur in the nucleus of atoms of elements.
Nuclear changes involves radioactive decays to give radiation and energy spontaneously known as radioactivity.
In this type of nuclear change no energy is required to start the reaction but large amount of energy are released.
Nuclear changes can also involve splitting of large nucleus into smaller nucleus of atoms known as nuclear fission or the formation of larger nucleus from the combination of two or more smaller nuclei known as nuclear fusion.
Energy is required to start nuclear fission and fusion but the energy released is far greater.
When compared with energy changes in chemical reactions, the energy released in nuclear reactions is far greater.
Therefore, nuclear changes involves changes in the composition of the nucleus of atoms with the release of large amounts of energy.
Learn more about nuclear changes at: https://brainly.com/question/25819143
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How many grams of rubidium are in 2.39 x 1024 atoms of rubidium?
Answer:
339 grams Rb
Explanation:
To find the final answer, you need to (1) convert atoms to moles (via Avogadro's number) and then (2) convert moles to grams (via molar mass from periodic table).
Molar Mass (Rb) = 85.468 g/mol
2.39 x 10²⁴ atoms Rb 1 mole 85.468 g
------------------------------- x ----------------------------- x -------------------- = 339 g Rb
6.022 x 10²³ atoms 1 mole
Calculate the volume of 450g of gold (density=19.3 g/cm^3)
use dimensional analysis and set up your equation like so:
[tex]450g\ x\ \frac{cm^3}{19.3g}[/tex]
if you do the calculations, the 'g' should cancel out which leaves you with the unit 'cm³'
[tex]cm^3=\frac{450g}{19.3g}[/tex]
[tex]cm^3=23.31606218...[/tex]
= 23.3 cm³
[tex]\text{Density,}~ \\\\~~~~~~~\rho = \dfrac{m}{V}\\\\\implies V = \dfrac{m}{\rho}\\\\~~~~~~~~~~=\dfrac{450 ~g}{19.3 ~ g~cm^{-3}}\\\\~~~~~~~~~~=23.3~ cm^3\\\\\text{Hence, the volume of 450g gold is }~23.3 ~cm^3.[/tex]
Which choice is not a physical property of matter?
O boiling point
O melting point
O viscosity
O heat of combustion
Answer: The Correct answer is D.) Heat of combustion
Explanation:
Answer:
D
Explanation:
i took the k-12 test
Using the chemical formula CaO + 2 NaCl → Na2O + CaCl2, calculate how many moles of CaCl2 you would produce if you used up 5.4 moles of CaO?
Answer:
5.4 moles CaO 1 mole CaCl₂ 5.4 mole CaCl₂
1 mole CaO
Explanation:
Can someone check my answers?
Balance the following chemical equations.
1. __4_ Fe + _3__ O2 → _2__ Fe2O3
2. __2__ C4H10 + __13__ O2 → __8__ CO2 + ___10_ H2O
3. __2__KClO3 → __2__KCl + __3__O2
4. _4___ NH3 + _5___ O2 → _4___ NO2 + _6___ H2O
5. __4__ FeCr2O7 + __8__ K2CO3 + ____ O2 → __2__ Fe2O3 + _8___ K2CrO4 + __8__ CO2
6. Given the reaction P4 + O2 → P2O5
a. Balance the equation
-P4 + 5O2 → 2P2O5
b. How many moles of P2O5 can be produced from 63.1 moles of O2?
-25.24
7. Mole ←→ Mass Conversions
Convert the following number of moles of chemical into its corresponding mass in grams.
a. 0.436 moles of ammonium chloride
-23.323
b. 2.360 moles of lead (II) oxide
-526.750
c. 0.031 moles of aluminium iodide
-12.639
d. 1.077 moles of magnesium phosphate
-283.095
e. 0.50 moles of calcium nitrate
-82.0439
8. Using the following equation:
2 NaOH + H2SO4 → 2 H2O + Na2SO4
How many grams of sodium sulfate will be formed if you start with 200 grams of sodium
hydroxide and you have an excess of sulfuric acid?
-355.25g
9. Using the following equation:
4 NH3 + 5 O2 → 4 NO + 6 H2O
How many moles and how many grams of oxygen (O2) are needed to react with 56.8
grams of ammonia by this reaction?
-4.18 moles or 133.6 grams
10. The catalytic decomposition of hydrogen peroxide is:
____H2O2 (aq) → ____H2O (l) + ____O2 (g)
a. Balance the reaction.
-2H2O2 → 2H2O + O2
b. How many moles of water and oxygen are produced by the decomposition of 86.0
grams of hydrogen peroxide?
-2.5
11. If 154.0 grams of potassium metal reacts with excess water, then how many grams of
potassium hydroxide and hydrogen gas are formed? What volume of hydrogen gas, in liters,
is formed at STP ? Be sure to balance the reaction first.
-__2_K(s) + __2__H2O(l) → __2__KOH(aq) + ____H2(g)
-220.99 grams of potassium hydroxide, 3.97 grams of hydrogen gas, 44.1 liters
12. The burning of solid sulfur in air produces sulfur dioxide gas.
S + O2 → SO2
Balance the reaction. How many moles of sulfur dioxide does the burning of 3 moles of
sulfur form? Calculate the volume of sulfur dioxide produced at STP.
-3 moles of sulfur dioxide, 0.06 l
13. The combustion of a sample of butane, C4H10 (lighter fluid), produced 2.76 grams of water.
2 C4H10 + 19O2 →
The above give the reactants of a combustion reaction.
a. What are the products?
-CO2 + H2O
b. Balance the equation?
-2 C4H10 + 13 O2 = 8 CO2 + 10 H2O
c. If you start with 9.3 grams of C4H10, how much pure O2 is left, if any?
-33.28 g
14. Convert 4084 grams of 3 kept at −40℃ to Liters at STP. The density as a liquid is
681.9kg/3
and 0.769/3
as a gas.
-5.3107 l as a gas, and 0.00598 l as a liquid
15. 3 decomposes into Nitrogen gas and Iodine. If you start with 0.02 grams of 3,
How many moles of Nitrogen are produced at STP?
-0.00002
Answer:
yea they look good. From what I can tell everything is correct.
Explanation:
You have an unknown compound of Potassium derivatives (KIxOy). This sample contains 17.0g of potassium, and 27.8g of oxygen and 55.2g of iodine. If you prepared another sample, but this time it had 460.0g of potassium periodate, how much oxygen and iodine would you have in your sample?
Answer:
The body temperatures in degrees Fahrenheit of a sample of adults in onle small town are 96.6 99.6 96. 3 97.3 99.8 97.7 97,6 97.9 99.2 Assume body temperatures of adults are normally distributed Based on this data find the 9900 confidence Interval of the mean body temperature of adults in the town Enter Your answer as an Open-interval (i.e. parentheses) accurate to 3 decimal places. Assume the data is from normally distributed population_ 9900 CI = Previewv Tp Enter 4euleie er using intewval notation. Example: [2,5) Uge U fcr unicr to combine interval:, Example: (-00,2] U [4,00} Entet each Faluce nunber (like 33,2.2172) Or 33 calculztion (like 5/3,243 5-4) Enter DNE for ar empty set, Use 00 to enter Infinity. Enter each valze accurate to decial place: Get Help: Points possible: 10 This attempt of 3 Me ye ingtmctor absutthis questin Poelis quesivto 6 EpIC e 6 DeA
Explanation:
(Unsure if this helped but hope it did!)
460 grams of Potassium periodate contains 128 grams of Oxygen and 253.9 grams of Iodine.
What is a compound?A compound is composed of atoms from two or more different elements chemically bonded together in fixed small whole number ratios to each other.
Mass of potassium= 17.0 grams
Mass of Oxygen= 27.8 grams
Mass of Iodine= 55.2 grams.
Mass of Potassium periodate= Mass of Potassium+Mass of Oxygen+Mass of Iodine
Mass of Potassium periodate= 17g+27.8g+55.2g
Mass of Potassium periodate= 100 grams
Therefore, 100 grams of Potassium periodate contains 27.8 grams of Oxygen
1 gram Potassium periodate contains 27.8/100= 0.278 grams of Oxygen
So, 1×460= 460 grams Potassium periodate contains 0.278×460
=128 grams Oxygen
Now,
100 grams of Potassium periodate contains 55.2 grams of Iodine
1 gram of Potassium periodate contains 55.2/100=0.552 grams of Iodine
1×460=460 grams Potassium periodate contains 0.552×460
=253.9 grams of Iodine.
So, 460 grams of Potassium periodate contains 128 grams of Oxygen and 253.9 grams of Iodine.
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Okay which is the answer
Answer:
KOH
Explanation:
When ionic compounds (a metal and a nonmetal) dissolve, they are good conductors of electricity, and would result in the brightest light. Weak bases and covalent compounds do not dissolve, so KOH, a strong base and ionic compound, would dissolve and conduct electricity.
Which of the following ways can be used to measure reaction rate?
a Measure the rate that a reactant is used up
c.a Measure the side reactions
b. Measure the amount that a product is .
d. Estimate the heat given off
formed
Answer:
the answer is b;
the rate of reaction can be found by measuring the amount of product formed in a certain period of time.
W
Which option below represents the strongest acids?
A. Ka = 4.0 x 10-10
B. Kb = 4.0 x 10-10
C. Complete (100%) dissociation of hydroxide ion
D. Complete (100%) dissociation of hydrogen ion
