Answer:
(c) 15.39 kg of copper present in 1tonne of ore.
Explanation:
We are given that ore contains 3% of copper carbonate
1tonne = 1000kg
3% of copper carbonate in 1000kg of ore will be
= [tex]\frac{3}{100}*1000[/tex] = 30kg
30 kg of copper carbonate is present in ore
CuCO3 has 63.5g of cupper present in it
molar mass of CuCO3 = 123.5
so the percentage of copper present in CuCO3
= [tex]\frac{63.5}{123.5}*100[/tex] = 51.3% of copper present per kg CuCO3
Now
amount of copper present in 30kg of CuCO3
= [tex]\frac{51.3}{100}* 30[/tex] = 15.39kg
15.39 kg of copper present in 1tonne of ore
The mass of copper obtained from 1 tonne of the ore is 15.4 kg
The copper ore has 3% of copper carbonate by mass.
The mass of copper carbonate in 1 tonne of the ore can be calculated below.
1000 kg = 1 tonne
Therefore,
mass of copper carbonate = 3 /100 × 1000 = 30 kg
atomic mass of copper = 63.5 g
molar mass of CuCO₃ = 123.55 g
123.55 g of CuCO₃ gives 63.5 g of copper
30, 000g of CuCO₃ will give ? of copper
cross multiply
mass of copper = 30,000 × 63.5 / 123.55
mass of copper = 1905000 / 123.55 = 15418.8587616 g
mass of copper = 15418.8587616 / 1000 ≈ 15. 4 kg
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The “rise” of the muffin is caused by the release of ___________ gas trapped in the mix as it is heated. carbon dioxide hydrogen oxygen helium
Answer:
Carbon dioxide
Explanation:
In the making of the muffins, there are many ingredients are used including flour, egg, butter, sugar, and flavoring of fruits. There is also a raising agent, the baking powder or baking soda used that reacts with the batter.
This reaction form bubbles of carbon dioxide, trapped in the air spaces during the baking and muffin raises. Carbon dioxide makes muffins light, by lifting the batter as it bakes.
Heyy, I am a 14 year old girl
HELP!! PLEASE 10+ points!
Can you tell from the masses of the reactants which one of the reactants will be the limiting reactant? Defend your answer (use an equation within your defense).
Answer:
Explanation:
so, limiting reactants are the reactant which limit the continuing of the reaction or in simple word they are the element that run out first and are totally consumed
equation :
2koh+h2so4⇒ k2so4 +2h2o
if we have 4 mol of h2so4 and 3 mol of 2koh
number of produced moles of k2so4 on consuming all :
h2so4 ⇒ k2so4
1 mol 1 mol
4 mol ?mol
no of mol of k2so4 if all h2so4 is consumed 4 mol
2koh⇒ k2so4
2 mol 1 mol
3 mol ?mol
no of mol of k2so4 if we consume all koh = 1.5 mol
since the koh produces less mol on consuming it all
the koh is the limiting reactant
PLEASE HELP!
How many moles of NaOH would produce 10 moles of water in this reaction?
2NaOH + H2SO4 → Na2SO4 + 2H20
Answer:
The correct answer is 10
Which option will increase the rate of reaction?
Answer:
Explanation:
there's no options that you put but usually if you add more of the reactant the rate will increase, adding a catalyst will increase the rate, and increasing the temperature if it's endothermic
what is polling in chemistry?
Answer:
Polling is a method used for the purification of copper or tin which contains oxide impurities
Answer:
Polling is used for the purification of copper or tin which contains oxide impurities. The impure metal is melted and stirred with green logs of wood. The heat of molten metal makes the green logs to liberate hydrocarbon gases which in turn reduce the metal oxide into metal.
the process that breaks down rocks
Chemical bonding is the combining of elementa to form
-energy levels
-atoms
-electrons
-compounds
What is the molar mass of H2SO4?
Answer:
98.08g/mol is your answer
Explanation:
hope this helps
heyy pls help anyone?
Answer:
i agree
Explanation:
perience
How many significant figures does each of the following numbers contain?
11. 163.890
12. 00560
13. 156, 100
14. 906,301
15. 6.022 x1023
16. 5.60 x 10-5
Dorform the fol
Answer:
11
Explanation:
Which of these types of changes is a physical change?
A. Breaking apart one substance into two substances
B. Dissolving one substance in another
C. Changing one substance into another
D. Making a new substance
Please helpppp i'll love you forever
The correct answer is A. Can I get the Brainliest?
What mass of water must be used to dissolve 0.500 kg C2H5OH to prepare a 3.00 m solution?
Answer:
500g Ika= 10.85 mol 500g (46.0699) - 10.35 mol - 3.00m - 13.62 kq 5.
Explanation:
Does this help?
A 3.00 M solution of [tex]C_2H_5OH[/tex] would be prepared by dissolving 0.500 kg of [tex]C_2H_5OH[/tex] in 3.62 kg of water.
Stoichiometric calculation0.500 kg [tex]C_2H_5OH[/tex] is equivalent to (mole = mass/molar mass):
500g/46.07 = 10.85 moles of [tex]C_2H_5OH[/tex]
3.00 M solution of [tex]C_2H_5OH[/tex] can be prepared by dissolving 10.85 moles in (molarity = moles/volume):
10.85/3 = 3.62 Liters of water
3.62 liters of water weighs (density = mass/volume);
1 x 3.62 = 3.62 kg
Thus, 3.62 kg of water will be required to prepare the solution.
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The _____ law of thermodynamics states that when two objects of different temperature are in contact, heat energy will flow from the hotter to the cooler object.
Answer:
Second.
Explanation:
There are four types or kinds of the laws of thermodynamics, but in this question we are actually considering the second law of thermodynamics.
The second law of thermodynamics, in a simple sense means that energies can flow in an equilibrate manner. It can also be stated as the total entropy of the universe. The second law is normal refer to as Law concerning Entropy.
Thus, filling the gap in the Question above. Note that the word written in capital letters is the missing word.
"The SECOND law of thermodynamics states that when two objects of different temperature are in contact, heat energy will flow from the hotter to the cooler object."
What wave properties do x-rays and gamma rays possess that cause them to have such high energy?
Answer:
Waves with a very short wavelength, high frequency and high energy
Explanation:
Which option is a compound?
Examples of compounds include table salt or sodium chloride , sucrose (a molecule, nitrogen gas, a sample of copper, and water.
How many moles of Nitrogen gas are in 135L of Nitrogen gas at STP?
Explanation:
P×V=n×R×T
L×atm / mol×K
n= PV /RT
Description:
So as we know that our Known variables: are P, V, R, T and our unknown variables are n. N= PV / RV. = 6.02 moles.
Answer: 6.02 moles
Hope this helps.
The moles of nitrogen gas present in 135 L at STP have been 6.02 moles.
The nitrogen gas has been assumed to be the ideal gas. For an ideal gas, at STP or standard pressure and temperature, the volume of 1mole of gas has been 22.4 L.
The STP conditions have been 273.15 K temperature, and 1 atm pressure.
Since, moles in 22.4 L gas been 1 mole. The moles in 135 L gas has been:
22.4 L = 1 mole
135 L = [tex]\rm \dfrac{1}{22.4}\;\times\;135\;moles[/tex]
135 L gas = 6.02 moles.
The moles of nitrogen gas present in 135 L at STP have been 6.02 moles.
For more information about the volume at STP, refer to the link:
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Is Steel a compound?
Steel is a mixture of iron and carbon fused together with one or more other metals or nonmetals. Because steel is a mixture rather than a chemical compound, steel does not have a set chemical compound formula.
Answer:
No
Explanation:
Steel is a mixture of iron and carbon fused together with one or more other metals or nonmetals. Because steel is a mixture rather than a chemical compound, steel does not have a set chemical compound formula.
The ocean both absorbs and releases heat more slowly than land does
True or false.
Are these correct?? Help please
The diagram below shows a longitudinal wave at one instant in its motion. Each oval represents a particle acted on by the energy of the wave as it moves from left to right.
Which line on the diagram indicates a region of rarefaction?
Answer:
Here now you can give the other person the brainly they deserve and they were right too :)
Explanation:
The line that has been the representation of the region of rarefaction in the diagram has been the line below the top line.
The diagram has been the representation of the movement of the particles under the influence of wave energy. The particles have been moving from left to right in the longitudinal order with a gain of energy.
The rarefaction has been the instance where the density of the waves has been lesser or where there has been one wavelength of the wave.
The diagram has been representing, at the line below the top arrow, there have been lesser density of the wave particles, thus, the region of rarefaction has been the instance in the lines below the top line.
For more information about the rarefaction, refer to the link:
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4. Hot material in the Earth's mantle rises and cool material
sinks. This is an example of
a. conduction
b. convection
c. radiation
d. none of these
Answer:
Th answer is b. convection.
Explanation:
As the heat rises it cools down and it sinks and as the cold sinks it heats up so then it rises back up.
Why is our mindset more important when you try to learn remotely than when you are learning face to face?
Answer:
It is more important because of the freedom.
Explanation:
While at home you can do your work of course... but you could lay down, take a nap. You could get on the game, play around. You could draw, and fiddle and dance and do WHATEVER you want with no teacher to stop you so you have to be your own motivation. You have to be your own teacher or its VERY easy to fail.
some safety precautions people should take when using fireworks
Answer:
Do not try to re-light or handle malfunctioning fireworks. Soak both spent and unused fireworks in water for a few hours before discarding.
Which statement best describes the process of the formation of the solar system?
Formation. Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material
What role does the Automated Surface Observing Systems (ASOS) play in weather forecasting?
Answer:
What role does the Automated Surface Observing Systems (ASOS) play in weather forecasting? It is a system of radar sensors used to track storms. It is the nation's primary weather-observing network. It provides weather reports much like the National Weather Service.
Explanation:
Answer:
the answer is c).It is the nation's primary weather-observing network.
Explanation:
Vocab Term
Letter of matching definition
Definition
Proton
E
A) An element containing a charge.
Neutron
K
B) The defined distances away from the nucleus that electrons exist.
Electron
M
C) The electrons exclusively on the outermost energy level
Neutral
L
D) A model of the atom that shows rings for energy levels and the total number of electrons in each energy level
Ion
E) A subatomic particle found in the nucleus with a positive charge
Cation
I
F) A negatively charged ion
Anion
F
G) The different shaped zones where electrons can be found most of the time but have undefined paths within.
Energy Level
L
H) A model of the atom that simply shows the element abbreviation and the number of valence electrons
Orbital
D
I) A positively charged ion
Valence Electrons
J) A model of the atom that shows the truest shape of the atom by showing orbitals stacked on top of each other to form layers of energy levels.
Quantum Mechanical Model
J
K) A subatomic particle found in the nucleus with no charge
Bohr’s Model
L) The state of an atom having no charge
Lewis Dot Structure
H
M) A subatomic particle found outside of the nucleus with a negative charge.
Answer:
E
Explanation:
took the test
If You are given 14 moles of C2H5OH(Ethanol) and 13 moles of O2( Oxygen), how
many moles of the limiting reactant is produce? C2H5OH + O2 -> CH3COOH +
H2O
Explanation:
1 ) first u have to balance the equation but in this case it is already balanced.
2) checking for the limiting reactant:
13 mol O2 × (1mol H2O / 1mol of O2) = 13 mol of H2O
14 mol of ethanol × (1mol H2O/ 1molof ethanol) = 14 mol of H2O
the less amount of moles produced from the O2 so the limiting reactant is oxygen
3) calculating the products moles
13 mol O2 × (1mol H2O / 1mol of O2) = 13 mol
13 mol O2 × (1mol Ch3Cooh / 1mol O2) = 13 mol
note: the ratios obtained from the balanced equation
4) the excess reagent is the ethanol 1 mol will be remain
pb3(po4)2 compound name
Answer:
Lead phosphate
Explanation:
Pb3(po4)2 has the compounded name of lead(II) phosphate.
What is lead(II) phosphate like ?It is a white, crystalline solid that is insoluble in water. Lead(II) phosphate is used in some paints and plastics, and it is also used as a pigment.
The name of the compound is based on the oxidation state of the lead atom. Lead can have two oxidation states, +2 and +4. In Pb3(PO4)2, the lead atom has an oxidation state of +2, so the compound is named lead(II) phosphate.
The phosphate ion has an oxidation state of -3, so there are two phosphate ions in the compound to balance the +6 charge of the three lead atoms.
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When is electrolysis used to extract metal?
Answer:
Explanation:
electrolysis is the technique that use direct current to drive a non spontaneous chemical reaction chemical reaction is the gain or lose of electron this technique is use to extract metal from theirs ores