Assuming the quantity of current passing through the zinc and copper electrolytes is the same, mass of Zinc deposited is (x/64) × 65.0 g.
What is electrolysis?Electrolysis is the decomposition of a substance known as an electrolyte when electric current is passed through its solution or molten form.
The mass of an electrolyte deposited when current is passed is dependent on the current and the charge on the ion.
In the electrolysis of copper and zinc, assuming the quantity of current passed through their solution are the same, the moles of each zinc and copper deposited will be the same since the charges on their ions are the same.
Assuming x g of copper is deposited.
molar mass of copper = 64.0 g
molar mass of Zinc = 65.0 g
moles of copper deposited = x/64
moles of zinc deposited = x/64
mass of Zinc deposited = (x/64) × 65.0 g
Therefore, the mass of Zinc deposited is (x/64) × 65.0 g.
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The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later. What is the half-life, in hours, of the radioisotope
The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later, then the half life time is 365 hours.
How do we calculate the half life time?Half life time for the first order reaction will be calculated by uisng the below equation as:
k = 0.693/t, where
t = half life time
k is the rate constant and its value will be calculatedy using the below equation as:
ln(No/N) = kT, where
No = initial concentration of radioisotope = 3000
N = remaining contentration of radioisotope = 2736
T = time require for above change = 48 hours
On putting these values on above equation, we get
k = ln(3000/2736) / 48 = 0.0019
Now putting this value in the first equation, we get
t = 0.693/0.0019 = 364.7 = 365 hours
Hence half life time is 365 hours.
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What is science? Write a definition for the word
Answer:
make me brainliest pls :)
Explanation:
Science is both a body of knowledge and a process. In school, science may sometimes seem like a collection of isolated and static facts listed in a textbook, but that's only a small part of the story. Just as importantly, science is also a process of discovery that allows us to link isolated facts into coherent and comprehensive understandings of the natural world.
Science is exciting. Science is a way of discovering what's in the universe and how those things work today, how they worked in the past, and how they are likely to work in the future. Scientists are motivated by the thrill of seeing or figuring out something that no one has before.
Science is useful. The knowledge generated by science is powerful and reliable. It can be used to develop new technologies, treat diseases, and deal with many other sorts of problems.
Science is ongoing. Science is continually refining and expanding our knowledge of the universe, and as it does, it leads to new questions for future investigation. Science will never be "finished."
Science is a global human endeavor. People all over the world participate in the process of science. And you can too!
Answer ASAP! Will award brainleist if correct!!
Let's see
M1V1=M2V21x=15(2)1x=30x=30mlOption D
In which reaction at equilibrium will the point of equilibrium shift to the right when the pressure decreases at constant temperature
1. N2(g) + 3H2(g) - 2NH3(g)
2. H2(g) + Bra(o) - 2HBr()
3. CaCO3(s) - Cao(s) + CO2(g)
3. N2(g) + O2(g) - 2NO(9)
Answer:3
Explanation: an increase in pressure will just place the point of equilibrium in the direction that fevers the formation of the fewer number of moles. A decrease in pressure will displace the point of equilibrium in the direction that favors the formation of a greater number of moles as a system attempts to return to equilibrium
The reaction CaCO3(s) →Cao(s) + CO2(g) at equilibrium will be shifted to the right when the pressure decreases at constant temperature.
What is equilibrium?Chemical equilibrium can be defined as the state of a system where the concentration of the reactant, as well as the concentration of the products, as well as the concentration of the products, will not change over time and the system's characteristics also will not change.
It is well known that when the number of moles grows, equilibrium shifts to the side where the number of moles grows when pressure is reduced.
In this equation, CaCO3(s) →Cao(s) + CO2(g)
Number of moles in reactant side= 1
Number of moles in product side = 2
Hence, for this reaction equilibrium will be shifted in right side.
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Sulfur burns in the air to form 33.6L of sulfur dioxide. (S = 32, O =16, 64g of sulfur dioxide has 22.4L, 32g of oxygen has 22.4L)
find mass of reacted oxygen
find mass of required oxygen
The mass of oxygen reacted/required in this reaction is obtained as 48g.
What is stoichiometry?The term stoichiometry has to do with mass- volume or mass - mole relationship which ultimately depends on the balanced reaction equation.
Now, we have the reaction; S + O2 ------>SO2
If 1 mole of sulfur dioxide contains 22.4 L
x moles of sulfur dioxide contains 33.6L
x = 1.5 moles of sulfur dioxide.
Since the reaction is 1:1, the number if moles of oxygen required/reacted is 1.5 moles.
Mass of oxygen required/reacted = 1.5 moles * 32 g/mol = 48g
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Proponents of breast feeding often cite the passing of antibodies to the infant as a benefit. This type of immunity would be considered
artificial active immunity.
natural active immunity.
natural passive immunity.
vaccination.
artificial passive immunity.
Answer:
Natural passive immunity
Explanation:
Breatsfeeding is natural....
antibodies passes from the parent to the infant...
The infant gets nutrition in which later antibodies will be formed by the nutrients..
Is a pearl a mineral? Explain your answer thoroughly. Read the description in the reference image to help you determine the answer.
HELP!! IM SO BAD AT SCIENCE!! PLEASE ANSWER AS SOON AS POSSIBLE
Answer:
A pearl is not a mineral
Explanation:
Even though a pearl is made up of a few little overlapping platelets of certain minerals such as aragonite, which is the stable form of calcium carbonate which is a necessary component for sealife. Why is a pearl not a mineral though? Yes a pearl is made up of mineral compounds, but its organic origins take away its ability to be included as a mineral. Pearls do not have distinctive crystal structures and are formed by living organisms.
A sample of oxygen occupies a volume of 250. liters at 375 K. Predict the volume of the sample, when the temperature drops to 280. K with constant pressure.
A. 164 L
B. 187 L
C. 223 L
D. 352 L
Answer:
187 L
Explanation:
its the correct answer on smartsparrow.
Explain the relationship by between society and the Technologies of using earths resources
Answer:
We used coal for electricity, water for steam engines when we used them, natural fossil fuels for gasoline and oil and we use earths oxygen/nitrogen gases to breathe
Explanation:
Hope this helps:)....if not then sorry for wasting your time and may God bless you:)
What is the empirical formula of a compound that is 41.4% Strontium, 13.24%
Nitrogen, and 45.3696 Oxygen
Empirical Formula StepsN2O6Sr Strontium Nitrate
Explanation:
Can someone please help me? :(
Answer:
b
Explanation:
Answer:
The answer is B
Explanation:
I hope this helps very much
freshwater is distributed in both time and space
What aspect of water makes it favorable to use in steam distillation?.
Answer:
The low molecular weight of water makes water a favorable liquid for steaming
A beaker filled with freshwater has a p h balance of 6.65. geraldo wants to model the effect of acids on the ph of water for a group of students. which pollutant should geraldo add to the water? what will the ph reading be after geraldo adds the pollutant?
Geraldo can add a pollutant with slightly basic nature so he will have a solution of neutral pH of 7.
What is pH?The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution.
The pH of 6.5 means that the solution is acidic.
By adding a pollutant which is slightly basic in nature, Geraldo will have a solution of neutral pH which is a pH of 7.
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Answer:
1.pesticide
2.less than 6.65
Explanation:
Will give brainliest
What is the second quantum number of a 1s2 electron in phosphorus, 1s22s22p63s23p3?
what are the ways to manage wastes.
Explanation:
1. Measure your waste
It is easier to manage and track your improvement on something that is measured. Start by recording the types and quantities of waste materials generated within your business.
This could just be a quick visual assessment and estimation of amount and types of waste per week. As you change how you manage your waste, you can compare and see what difference your changes make to the amount of waste disposed to landfill.
2. Reduce
To reduce the amount of waste going to landfill, consider:
can waste be avoided or reduced by the way you procure goods and services or by changing your business operations?
does another local business have a use for the waste materials produced by your business?
what materials can be targeted for recycling?
3. Recycle
Find out what options are available locally for business recycling.
4. Collection services
It is a good idea to find out how levy fees will be managed by your waste service provider, and find out more about your waste collection services—how it impacts your ability to recycle and what options are available to you.
5. Separating waste
It’s important to ensure that waste is correctly separated for recycling. Putting the wrong waste in contaminates the recycling. Check out the free-to-download recycling signage to help businesses communicate correct recycling and waste separation behaviours.
The volume of a gas collected when the temperature is 11. 0°c and the pressure is 710 mm hg measures 14. 8 ml. What is the calculated volume of the gas at 20. 0°c and 740 mm hg?.
Answer:
Original: P₁ = 710 mmHg, V₁ = 14.8 mL, T₁ = (273.2 + 11.0) K = 284.2 K
New: P₂ = 370 mmHg, V₂ = ? mL, T₂ = (273.2 + 20.0) K = 293.2 K
Combined gas law: P₁V₁/T₁ = P₂V₂/T₂
Then, V₂ = V₁ × (P₁/P₂) × (T₂/T₁)
Calculated new volume, V₂ = (14.8 mL) × (710/370) × (293.2/284.2) = 29.3 mL
For a given voltaic cell, you double the concentrations of all soluble components to 2.0 M instead of the standard 1.0 M. All other conditions are standard. What happens to the cell emf
If the concentration of the solutions are doubled then the cell EMF is also doubled.
Nernst equationAccording to the Nernst equation, the concentration of the species determines the cell EMF as we can see form the formula;
Ecell = E°cell - 0.0592/nlogQ.
Hence, if the concentration of the solutions are doubled then the cell EMF is also doubled.
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How many hydrogen molecules are in 1.2 moles of hydrogen?
7.2 x 10^23
0.19 x 10^23
1.9 x 10^24
4.8 x 10^23
Answer:
7.2 x 10^23
Explanation:
Currently in Chemistry class
How many different consitutional isomers are there for a compound having the molecular formula C3H6O
Answer:
that make 11 isomers....
A sample of radon gas has a volume of 1.53 L, a pressure of 1.15 atm, and a temperature of 305 K. What is the new pressure if the new volume is 1.78 and the new temperature is 325 K
Answer: 0.813 L
Explanation:
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of helium gas is 5.63 atm.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of radon gas
V= volume of radon gas
n =number of moles of radon gas
T =temperature of radon gas
R = Gas constant = 0.0821 L.atm/K.mol
Combining Boyle's and Charles' gas law
P₁V₁/T₁ = P₂V₂/T₂
{ (1.15 atm) (1.53 L)} ÷305 K ={ (P2) ( 1.78)} ÷325 K
P2 = 7.55÷1.34 = 5.63 atm
Therefore the new pressure of radon gas is 5.63 atm when the temperature is changed to 325K and volume is decreased to 1.78liter.
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A chemist wants to make 750mL of a 6M NaOH solution. What mass (in grams) of NaOH will they need?
Answer:
180 g NaOH
Explanation:
Step #1 : Use the molarity equation to find moles. The volume is needed in liters, so convert the milliliters to liters.
Molarity (M) = moles (mol) / liters (L) ---->
Molarity (M) x liters (L) = moles (mol)
750 mL NaOH 1 L
x ---------------- = 0.75 L NaOH
1,000 mL
(6 M NaOH) x (0.75 L NaOH) = ? mol
= 4.5 mol NaOH
Step #2 : Find the mass using the moles and the molar mass of the solution. The molar mass can be calculated using the values of the elements on the periodic table.
Molar Mass (g/mol) = grams (g) / moles (mol) --->
Molar Mass (g/mol) x moles (mol) = grams (g)
? g/mol = (22.99 g/mol Na) + (15.999 g/mol O) + (1.008 g/mol H)
? g/mol = 39.997 g/mol NaOH
(39.997 g/mol NaOH) x (4.5 mol NaOH) = ? g
= 179.99 g NaOH
= 180 g NaOH (2 sig figs)
= 200 g NaOH (1 sig fig)
Plan an investigation to explore the evidence that an electric current produces a magnetic field, and that a changing magnetic field produces an electric current.
Answer:
Give evidence for the existence of a magnetic field near a current carrying wire. If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected.
What are some downsides to fossil fuels? (Select all that apply.) pls help im timed
They are expensive to extract compared to other forms of energy.
They release large amounts of carbon dioxide when burned.
They do not replenish themselves.
They are in a limited supply.
Answer:
B, C and D
Explanation:
Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.
Although fossil fuels are continually formed by natural processes, they are classified as non-renewable resources because they take millions of years to form.
fossil fuels, are called nonrenewable, which means they have a limited supply and are not continuously being made or they are made very slowly
When liquid bromine is cooled to form a solid, which of the following types of solid would it form?.
Answer:
If liquid bromine is cooled to form a solid, which type of solid does it form? Brass is made by melting copper and zinc and physically mixing them. As this alloy is cooled, it forms a solid where the copper and zinc are not chemically bonded together.
Explanation:
Describe how you would make 6.0 L of a 0.100 M KCl solution from a 4.0 M stock KCl solution.
Answer:
0.15 l of 4.0 m stock KCl solution should betaken
Explanation:
N1V1=N2V2
6*0.1=V2*4
V2=0.15L
The _______ is the part of the neuron that carries information away from the cell body.
cell body
axon
dendrite
nucleus
Answer:
b
Explanation:
What are the spectator ions in the
following reaction?
NiS (s) + 2HCl(aq)
NiCl₂(aq) + H₂S(g)
B
S²-
CIT
Answer:
S
Explanation:
What is the concentration, in molarity, of a solution that contains 19g of NaOH dissolved into water to make 500 mL of solution?
Answer:
The molar concentration of NaOH in the final diluted solution is 0.056 M
Explanation:
~cosmic snowball ~orbits our Sun ~frozen gases, rock and dust ~may have brought water to Earth ~dust and gases form a tail that stretches away from the Sun The prompt above is describing what celestial body?
Answer:
A comet
Explanation:
Comets travel so fats through the solar system that they melt which give them their glowy tail