Which of the following is an oxidation-reduction reaction?Fe2O3 + 3CO mc009-1.jpg 2Fe + 3CO2
CuSO4 + 2NaOH mc009-2.jpg Cu(OH)2 + Na2SO4
2NaOH + H2CO3 mc009-3.jpg Na2CO3 + 2NaOH
Pb(NO3)2 + Na2SO4 mc009-4.jpg 2NaNO3 + PbSO4
Answers
Answer:
The correct option is: Fe₂O₃ + 3CO → 2Fe + 3CO₂
Explanation:
An oxidation-reduction reaction, also known as the redox reaction, is a chemical reaction in which there is simultaneous transfer of electrons from one species to another.
The species that gains electrons gets reduced. Whereas, species that loses electrons gets oxidized.
Among the given options, only reaction 1 is a redox reaction:
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Reason- In this reaction, iron (Fe) gains electrons and gets reduced from +3 oxidation state in Fe₂O₃ to 0 oxidation state in Fe. Whereas, carbon (C) loses electrons and gets oxidized from +2 oxidation state in CO to +4 oxidation state in CO₂.
Since both the oxidation and reduction reactions are occurring simultaneously.
Therefore, it is an redox reaction.
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be 2.69 g and the mass of the unknown pieces, including the weighing
boat, to be 18.01 g. To find the volume of the pieces, he measured out 25.7
mL of water in a graduated cylinder and then added the pieces to find a
new volume of 32.3 ml. What is the identity of the substance?
Density
2.16
Mineral
Halite
2.32
Gypsum
Quartz
2.65
2.72
Calcite
3.18
Fluorite
O halite
O quartz
O
O gypsum
fluorite
juju
Answers
The material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.
Density can be defined as the mass of the substance per unit volume.
To calculate the density of the unknown piece, the mass has been calculated as:
Mass of unknown piece = Mass of weighing boat with the unknown piece - Mass of weighing boat
Mass of unknown piece = 18.01 g - 2.69 g
Mass of unknown piece = 15.32 grams.
The volume of the unknown piece can be calculated as:
The volume of unknown piece = Final volume - Initial volume
The volume of the unknown piece = 32.3 mL - 25.7 mL
The volume of the unknown piece = 6.6 mL.
The density can be expressed as:
Density =
The density of the unknown piece =
The density of the unknown piece = 2.32 g/mL.
From the given set of pieces, the material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.
For more information about density, refer to the link:
Answer : The identity of the substance is gypsum.
Explanation : Given,
Mass of weighing boat = 2.69 g
Mass of unknown pieces including weighing boat = 18.01 g
Initial volume = 25.7 mL
Final volume = 32.3 mL
First we have to calculate the mass of unknown pieces.
Mass of unknown pieces = Mass of unknown pieces including weighing boat - Mass of weighing boat
Mass of unknown pieces = 18.01 g - 2.69 g
Mass of unknown pieces = 15.32 g
Now we have to calculate the volume of unknown pieces.
Volume of unknown pieces = Final volume - Initial volume
Volume of unknown pieces = 32.3 mL - 25.7 mL
Volume of unknown pieces = 6.6 mL
Now we have to calculate the density of unknown pieces.
Now putting all the given values in this formula, we get:
From the given table we conclude that the unknown piece is gypsum whose density is 2.32 g/mL.
Therefore, the identity of the substance is gypsum.
Answers
= 27 cm ³
Mass = 213 g
Density =
=
= 7.89 g / cm³
Thus answer is D.
b. erosion.
c. physical weathering.
d. rock weathering
Answers
Because the carbon dioxide mixed with the air changes the chemical composition of limestone.
Hope it helps.
The correct answer is A. chemical weathering!
Answers
C₂H8 is Dimethocain-M. In C₂H₈ two atoms of carbon are present. Combustion of 6.40 mole C₂H₈ produced 12.8 moles of CO₂.
What is combustion ?
Combustion reaction refers to burning of compound in presence of oxygen. The reaction is accompanied by heat and light. One mole of burned carbon produced one mole of CO₂ gas.
Combustion is a chemical reaction between substances ,usually including oxygen and usually accomplished by the generation of heat and light.
Here we see that in C₂H₈ there are there are two carbons present then 2 moles of CO₂ gas is produced i.e. 2 × 6.40 = 12.8 moles.
Hence, 12.8 moles of CO₂ produced in combustion of 6.40 mole C₂H₈.
To learn more about combustion refer the link below;
#SPJ2
Answers
It is also extremely expensive to process gold to its purest form, so pure gold jewelry would be ridiculously expensive, to the point of no demand.
Hope that helped =)
2. Pure gold isn't durable, and wouldn't last, nor would you be able to keep it on your finger since it's so soft. If you're gonna wear a ring for a life-time, it has to have durability.