Answer: A galvanic cell consists of two different metals (electrodes) connected through a conducting solution (an electrolyte) and also connected externally completing a circuit.
You are given 250 mL of a 12.0 M solution of KNO3. To obtain a 5.0 M, to what volume does the solution need to be diluted to?
600 ml
104.17 mL
0.24 mL
60 mL
Answer:
600 mL
Explanation:
molarity 1 * volume 1 = molarity 2 * volume 2. So this means 12 * 250 = 3000 and divide that by 5 to get 600 mL.
In the Caribbean countries, general election is usually held every _ years
it is held every 4-5 years
Hi can someone who know the answers tell me what it is and pls don't send me a link also don't send me the wrong answers if you don't know it's ok :)
Answer:
you diba ikaw ang nagpamalimali diba no
4. A blue light is shined on objects X and Y. Object X appears to be blue, and object Y appears to
be black. Which of the following is correct?
A. Object X absorbs blue light, and object Y reflects blue light.
B. Object X reflects blue light, and object Y absorbs blue light.
C. Object X must be black, and object Y must be blue.
D. Object X must be blue, and object Y must be black.
A blue light is shined on objects X and Y. Object X appears to be blue, and object Y appears to be black when Object X reflects blue light, and object Y absorbs blue light. Hence option B is correct.
What is light ?Visible light spectrum is nothing but the range of wavelength of radiation from 4000 angstrom to 7000 angstrom(Violet to Red). light is a energy packet. Every Photon having different wavelength travels with same velocity c (velocity of light). When we focus numbers of colors from visible spectrum to a point, that point appears as a white light. hence white light is composed of numbers of Colors in it.
When we pass white light through a prism, as white light enters in the prism all the colors having different wavelength travels with different velocity in the prism due to that there is separation of colors from the white light. Therefore we get different colors of white light in the prism this phenomenon is know as dispersion of light.
Light can be reflected, absorbed, transmitted diffracted and scattered etc.
α + β + ν = 1 where α, β, ν are coefficient of absorption, reflection and transmission.
When any object appears to be black it means that radiation has been absorbed by that body, it has high absorption coefficient. and when a body appears to be colored, it means that object has reflected the particular color, it having high reflection coefficient.
Hence option B is correct.
To know more about light :
https://brainly.com/question/15200315
#SPJ2.
What will the change in temperature be when 90 J are applied to 15 g of gold. (Cgold = 0.126 J/gºC)
Round your answer to the nearest whole number.
°C
E
3
4
5
Next
O
I 17
Answer:
48 °C
Explanation:
q = 90J
m = 15 g
C = 0.126 J/gºC
q = mct
90 = (15)(0.126)t
t = 47.62 °C = 48 °C
Answer:
Explanation:
Formula
E = m * c * Δt
Δt is what you seek.
Givens
E = 90 joules
m = 15 grams
c = 0.126
Solution
90 = 15 * 0.126 * Δt Divide by 15
90/15 = 15/15 * 0.126 * Δt
6 = 0.126 * Δt Divide by 0.126
6/0.126 = Δt
47.619 = Δt
Δt = 48 oC
- How much power does it take to lift a
1,000 N load 10 m in 20 s?
Answer:
"500 Joule/sec" is the right answer.
Explanation:
The given values are:
Force,
F = 1000 N
Velocity,
s = 10 m
Time,
t = 20 s
Now,
The power will be:
= [tex]\frac{Force\times Velocity}{Time}[/tex]
On putting the values, we get
= [tex]\frac{1000\times 10}{20}[/tex]
= [tex]\frac{10000}{20}[/tex]
= [tex]500 \ Joule/sec[/tex]
1. If 80.0 ml of 3.00 M HCl is used to make a 100. ml of dilute acid, what is the molarity
of new dilute HCl solution?
We are given:
M1 = 3 Molar V1 = 80 mL
M2 = x Molar V2 = 100 mL
Finding the molarity:
We know that:
M₁V₁ = M₂V₂
where V can be in any units
(3)(80) = (x)(100)
x = 240/100 [dividing both sides by 100]
x = 2.4 Molar
In which type of chemical reaction would two reactants join together and form one product
Answer:
Synthesis Reaction
Explanation:
A synthesis reaction occurs when two or more reactants combine to form a single product. In a decomposition reaction, one reactant breaks down into two or more products. This is the reverse of a synthesis reaction. Replacement reactions occur when elements switch places in compounds.
Potassium hydroxide is partially soluble as shown by the
following reaction:
KOH(s) K+ (aq) + OH(aq)
What is the poH of a 3.32 x 10-5 M KOH solution?
pOH =
Your answer should be rounded to three significant figures. Do not Include
units in your answer.
Answer: 4.48 or 4.47
What is the mass of disulfur pentoxide (S2O5)?
Answer: What is the mass of disulfur pentoxide (S2O5)?
Explanation:144.14g/mol
Calcula cuantos mililitros de oxigeno se necesitan para quemar 3.5 ml de C₆H₆ a CNTP, la reacción sin balancear es la siguiente: C₆H₆ + O₂ → CO₂ + H₂O
Answer:
[tex]26.25mL \ O_2[/tex]
Explanation:
¡Hola!
En este caso, dado que se nos da reacción de combustión del benceno, primero debemos balancearla como se muestra a continuación:
C₆H₆ + ¹⁵/₂ O₂ → 6CO₂ + 3H₂O
Vemos que hay una relación molar entre el benceno y oxígeno de 1:¹⁵/₂, por lo que la relación de volúmenes es:
[tex]3.5 mL\ C_6H_6*\frac{15/2\ mL\ O_2}{1mL\ C_6H_6} \\\\=26.25mL \ O_2[/tex]
¡Saludos!
in figure 21-4b in what direction is the force defeating the wire
Answer:
the one that has more power to it
How many particles in 352 moles of KLICO3?
O 106 particles
O 2.12 x 1026 particles
O 6.38 x 1025 particles
Answer:
there are 106 particles
Find the hydroxide concentration of a LiOH soultion that has a pOH of 8.65.
[OH] = _____ (round to 2 decimal places)
Answer: i need help
Explanation:
The total pressure of two unknown gases is 5 kPa. The partial pressure of one of the gases is 2.345 kPa, what is the partial pressure of the other gas?
Answer:
[tex]p_2=2.655kPa[/tex]
Explanation:
Hello there!
In this case, according to the Dalton's law, which states that the total pressure is equal the sum of the pressures of the gases in the mixture, we write the following for this system:
[tex]P_T=p_1+p_2[/tex]
Thus, we solve for the partial pressure of the gas #2 as shown below:
[tex]p_2=P_T-p_1\\\\p_2=5kPa-2.345kPa\\\\p_2=2.655kPa[/tex]
Best regards!
Blank O2 + blank Mg arrow blank MgO
Select the coefficients that balance the equation:
MgO *
A) 1,1,1
B) 1,2,2
C) 2,3,4
D) 1,4, 2
Answer:
its a
Explanation:
a
NO LINKS OR FILES
Using Ohm's Law and Watt's Law. write the formula to find each measurement
Wattage (Watts)
Resistance (Ohms)
Voltage (Volts)
and/or
Current (Amps)
and/or
Explanation:
Mathematically, Ohm's law is given by :
V = IR
Where
V is voltage
I is current
R is resistance
The electric power of an electrical appliance is given by:
P = VI
Wattage = VI
Resistance, [tex]R=\dfrac{V}{I}[/tex]
Current, [tex]I=\dfrac{V}{R}[/tex]
Hence, this is the required solution.
In steps 3 and 4 of the citric acid cycle, successive oxidations produce ________ as a waste product and the four-carbon carrier ________. In steps 3 and 4 of the citric acid cycle, successive oxidations produce ________ as a waste product and the four-carbon carrier ________. CO2; malate CO2; succinyl-SCoA ADP; oxaloacetate ADP; succinyl-SCoA CO2; oxaloacetate
Answer:
CO2; succinyl-SCoA
Explanation:
Citric acid cycle, also called Krebs cycle is the second stage of aerobic cellular respiration, which occurs in the mitochondrion. The kreb's cycle is made up of 7 distinct steps, with each involving series of enzymatic reactions.
According to this question, step 3 and 4 of the citric acid cycle involves an oxidation and decarboxylation reaction to produce 2 molecules of carbon dioxide (CO2) and a 4-carbon compound called succinyl group. A coenzyme A binds to the succinyl group to form succinyl-SCoA.
moles of H2O are needed to exactly react with 2.0 moles of Ca
Answer:
4
Explanation:
so first write the balance equation
Ca+2H2O---->Ca(OH)2 + H2
then use molar ratio of H2O and Ca
which is 2:1 so if there are 2 moles of ca there will be 4 moles as you times it by 2. like this
Ca:H2O
1:2
2:4
Hope this helps u understand:)
How many moles of nitrogen are in 12 grams
Answer:
Explanation:
The chemical formula of nitrogen is N2
A mol of Nitrogen atoms = 14 grams
So N2 will have a molar mass of 14 * 2 = 28 grams
number of moles of N2 = given mass / molar mass
number of moles of N2 = 12 / 28
number of moles of N2 = 0.4286 mols
3. 7moles of Ba(NO3)2 is dissolved in 75kg of distilled water.
What is the boiling point of this solution? Hint: Find molality first.
Answer:
100.14°C
Explanation:
The boling point elevation is a colligative property that describes the increasing in boiling point of a solution regard to the boiling point of the pure solvent. The equation is:
ΔT = Kf*m*i
Where ΔT is boiling point elevation
Kf is boiling point elevation (0.51°C/m for water)
m is molality of the solution (7moles Ba(NO3)2 / 75kg = 0.09333m
i is Van't Hoff factor = 3 for Ba(NO3)2 (Because its dissolution produce 3 ions = Ba²⁺ and 2 NO₃⁻
Replacing:
ΔT = 0.51°C/m*0.09333m*3
ΔT = 0.14°C is the boiling point elevation
As the boiling point of water is 100°C, the boiling point of the solution is:
100°C + 0.14°C =
100.14°C
11
Cr2O3 + 2Al → 2Cr + Al2O3
Chromium is produced by reacting its oxide with aluminum. If 76 g of Cr2O, and 27 g of Al completely react to form 51 g of Al2O3. how many grams of Cr are formed?
Answer:
Deci trebuie sa te aplici cu 2 din3 pe suprafata pamanyului chinez
Explanation:
Deci 1287+2086+2762+7:5
what is the mass of 0.200 mol of calcium
¿Cómo se llama el grupo IIA de la tabla periódica?
Answer:
los metales alcalinotérreos: berilio (Be), magnesio (Mg), calcio (Ca), estroncio (Sr), bario (Ba) y radio (Ra).
o simplemente llamado grupo 2A
Explanation:
Which of the following statements about alkynes is incorrect?
Alkynes are unsaturated hydrocarbons.
Alkynes have triple bonds.
Alkynes are saturated hydrocarbons.
Alkynes have carbon atoms.
Answer:
Alkynes are saturated hydrocarbons
Explanation:
Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon to carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.
Alkynes like alkenes are unsaturated hydrocarbons because of their triple and double carbon bonds respectively. Unsaturated hydrocarbons do not have a complete hydrogen atom in their structural composition. Hence, the statement that "Alkynes are saturated hydrocarbons" is FALSE.
What volume of water is needed to make 5.41 M solution with 47.71 moles of HCL?
Answer:
0.113 liters
Explanation:
5.41 M / 47.71 moles = 0.113 liters
If 13 grams of copper sulfate is reacted with zinc how much of each product is produced?
Answer:
No. Of Moles of zinc = m/Ar
= 13/ 65.38 = 0.198 moles
From balanced equation, Mole ration between CuSO4 and Zn is 1 : 1
So only 0.198 moles of CuSO4 reacts, it is in excess
Mass = no of Moles X Mr
Mass = 0.198 X 159.5 = 31.59 grams
Volume = mass m denisty
Volume j 31.59 / 3.6 = 8.78 ml
Explanation:
i think this wrong
How would you find the density of a can of soda pop?
A. Find the mass of the can of soda pop and then multiply by the number of cubic centimeters in the can
B. Find the mass of the can of soda pop and then divide by the number of cubic centimeters in the can
C. Convert a gallon into cubic centimeters and then divide by the mass of the can of soda pop
D. Convert a gallon into cubic centimeters and then subtract the mass of the can of soda pop
Answer:
it's A.
Explanation:
have uh good day ma :)))))))
Which best completes the analogy?
B Cells : Produce Antibodies :: T Cells : ___________________
A. Get rid of good cells that have been infected
B. Tell B cells to start making antibodies
C. Tell killer cells to attack
D. remember antigens that have attacked the body
Answer:
d
Explanation:
d
why dil. sulphuric acid cannot be used instead of dil.hcl in lab preparation of carbon dioxide gas?
Answer:
Because Sulphuric acid(H2SO4) is one of the substance which have a very high vigourous reaction if mix with chemicals thats why we take the same sulphuric acid but having lighter effects known to be as Dil.Sulphuric And so it is generally use for precaution while during experimentations Thats why we use it.
Hope it helps