Looking at the density of the penny which is 7.1347 g/cm³, it can be concluded that it is not made from copper.
What is density?It is the ratio of the mass of a substance to its volume.
Mathematically; density = mass/volume
In this case, the mass of the coin is 2.49 g, and the volume is 0.349 cm³. Thus:
Density of coin = 2.49/0.349 = 7.1347 g/cm³
The density of copper is 8.96 g/cm³ at room temperature.
Hence, the penny is not made of copper.
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Is iodine solution and vinegar soluble or insoluble?
Answer: lodine solution and vinegar are both soluble
Solution is the mixture of solute and solvent. Iodine solution and vinegar solution both are soluble. Iodine and vinegar are the homogenous mixture.
What is solution ?A solution is a homogeneous mixture of o solutes and solvent. Solvent is the material in which a solute dissolves to produce a homogeneous mixture. Solute is the material that dissolves in a solvent to produce a homogeneous mixture in phase
Common examples of solution are sugar in water and salt in water solutions, soda water etc. In a solution, all the components that are present as a single phase. Iodine and vinegar both molecule shows homogenous mixture.
Hence, the iodine solution and vinegar solutions are soluble, both compounds are homogenous mixture. Both are totally soluble.
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WILL MARK BRAINLIST!! The image depicts the composition of air. Use the image to explain why this statement is correct: “Mixtures are composed of different proportions of pure substances.”
Answer:
Air is a mixture, and the image shows that it is composed of different amounts of the same several pure substances.
Explanation:
water, O2, and carbon dioxide (all mixtures) are made of pure substances like hydrogen, oxygen, and carbon.
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a change to any gas in the atmosphere affetcs energy absorbed by the surface in the same way.
Agree or Disagree?
A change to any gas in the atmosphere affects energy absorbed by the surface in the same way of green house effect.
What is green house effect?Green house effect is a phenomena in which energy from the sun comes to the earth and the gases which are present in the atmosphere of the earth absorbs the energy from the sun and raises earths temperature.
The gases which are especially responsible for this effect are carbon dioxide, methane, nitrous oxide, ozone and vapors of water. Change in the concentration of this gases will affect the energy absorbed by the surface.
Hence, this is same like green house effect.
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Write a balanced half-reaction for the reduction of permanganate ion mno−4 to solid manganese dioxide mno2 in acidic aqueous solution. Be sure to add physical state symbols where appropriate
The half-reaction includes either the reduction or the oxidation reaction of the redox reactions. In acidic solution permanganate ion will react with hydrogen ion to yield manganese ion and water.
What are Redox reactions?
Redox or oxidation-reduction reactions are the chemical reactions in which the oxidation and the reduction of the chemical species occur simultaneously.
Permanganate (VII) ion is a strong oxidizing agent and gets easily reduced to manganese ion in presence of the hydrogen ion in an acidic solution.
The balanced half-reaction for reduction is shown as,
[tex]\rm MnO_{4}^{-} \; (aq)+ 8H^{+} \; (aq)+ 5e^{-} \rightarrow Mn^{2+} \; (aq)+ 4H_{2}O \; (l)[/tex]
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Laughing gas is a compound called dinitrogen
monoxide. what amount (in mol) of dinitrogen
monoxide, n2o(g), contains 3.40 x 10^23 molecules?
What causes cold, deep ocean currents to form in the ocean currents near the poles?
What causes deep, cold currents to form in the oceans near the poles? The sinking of dense, cold water paired with high salinity.
what are the three steps of water treatment?
Answer:
primary, secondary and tertiary water treatment.
Explanation:
Assuming that both cases describe hydrogen‑like atoms with one electron, for which case is more energy emitted or absorbed?
Assuming that both cases describe hydrogen‑like atoms with one electron, More energy is emitted or absorbed for case 2. The correct option is D.
What is emitting of energy, by electron?The energy of the electron decreases as it changes levels, and emission of photons happens in the atom.
With the electron moving from a higher to a lower energy level, the photon is emitted. The photon's energy is the same as the energy lost by an electron moving to a lower energy level.
Thus, the correct option is D, More energy is emitted or absorbed for case 2.
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calculate the molarity of a solution made of 10 moles of salt with 5 liters of water.
Answer:
2 M
Explanation:
molarity = (moles of solute)/(liters of solution)
molarity = 10/5 = 2 M
write the net ionic equation and identify the spectator ions KOH+NaCl
KOH+NaCl⇒NaOH+KCl
there is no net ionic equation because all compounds dissolves
In a neutral atom, what is the number of electrons equal to
In a neutral atom, the number of electrons equal to the number of protons
True or false: The rate law for an elementary step can be deduced from its reaction stoichiometry (i.e., from the balanced equation for the step).
Answer:
True
Explanation:
When determining rate law, the coefficients in the balanced equation are used to determine how different concentrations affect the rate.
A chemical engineer is developing a process for producing a new chemical. One step in the process involves allowing a solution of potassium hydroxide to react with a solid.
Which action would most likely increase the reaction rate for this step?
using larger pieces of the solid
using a more concentrated potassium hydroxide solution
adding water to the system
the 2nd one is correct
The option that would most likely increase the rate for a more contentrated potassium hydrogene
:) hope this helps
using a more concentrated potassium hydroxide solution
Concentration is one of the factors that affect the rate of reaction
The higher the concentration, the higher the reaction rate
When aqueous solutions of potassium hypochlorite and nitric acid are mixed, an aqueous solution of potassium nitrate and hypochlorous acid results. Write the net ionic equation for the reaction
The net ionic equation for the reaction between aqueous solutions of potassium hypochlorite and nitric acid is NO₃⁻ + K⁺ → KNO₃.
What is net ionic equation?The net ionic equation is a chemical equation that determines which ions are involved in the final product's creation.
Chemical reaction will be represented as:
HNO₃(aq) + KClO(aq) → KNO₃(s) + HClO(aq)
Ionic equation for the above reaction will be represented as:
H⁺ + NO₃⁻ + K⁺ + ClO⁻ → KNO₃ + H⁺ + ClO⁻
In the above equation H⁺ and ClO⁻ are the spectator ions, so the net ionic equation of the given chemical reaction is:
NO₃⁻ + K⁺ → KNO₃
Hence net ionic equation for the given reaction is NO₃⁻ + K⁺ → KNO₃.
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Snow that falls on the ground melts slowly. Snow that falls on Stefan’s nose melts very
quickly.
Give a reason for this.
______________________________________________________________________________
Answer:
because Stefan's nose is so warmer than the ground.
ground have a same temperature like air but nose of human have maybe 32°C.
When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Snow that falls on Stefan’s nose melts very quickly because Stefan's nose is so warmer than the ground.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing.
Snow that falls on the ground melts slowly. Snow that falls on Stefan’s nose melts very quickly because Stefan's nose is so warmer than the ground. Ground have a same temperature like air but nose of human may have 32°C.
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There must be the same number of each type of atoms (element/ion) on each side of a balanced chemical equation
A balanced equation contains the same number of atoms of the element on both sides of the equation. The statement is true.
What is a balanced equation?A balanced equation is the representation of the molecules or the compound of the reactants on the left and the product on the right side of the reaction equation with their stoichiometry coefficients and symbols.
The number of the atoms of the molecules on the reactant side and the product side of the same element must be equal so, that the law of the conservation of mass is justified.
Therefore, the statement is true.
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A triple bond is made up of
sigma bond(s) and
1,2
pi bond(s).
2,1
Answer:
1 sigma bond and 2 pi bonds
Explanation:
A triple bond is made up of 1 sigma bond and 2 pi bonds.
Given example is that of ethyne
Answer:
1 [tex]\sigma[/tex] and 2π bonds
Explanation:
Always remember that
First bond among any two atoms is always Sigma bond .then rest forming bonds are pi bondsBreaking a Signa bond is far difficult than breaking pi bondsThat's why tripple bond is unstableThe general example is
N=N bond
How many moles of diphosphorus
pentoxide can be made from
1.23 moles of oxygen?
P4+ 02 + P205
What type of source would provide you with the most reliable information on gas efficiency in a new car model?
A peer-reviewed study by university researchers.
A close friend.
A personal blog.
A study completed by the car manufacturer.
Answer:
A peer-reviewed study by university researchers.
Explanation:
The manufacturer of the car might be interested in making the car look more efficient than it is.
Which product of the electron transport chain reenters the krebs cycle? a. atp b. coa c. nad d. nadh e. pyruvate
The product of the electron transport chain that reenters the krebs cycle is NAD. Details about electron transport chain can be found below.
What is cellular respiration?Cellular respiration is the process by which living organisms break down food molecules in their cells.
The process of cellular respiration involves the following stages:
GlycolysisKrebs cycleElectron transport chainThe electron transport chain is a series of reactions that involve the transfer of electrons from one molecule to another. NAD+ is one of the electron acceptor and products of the ETC that reenters the kreb cycle.
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Please Help Me
What must a mining company do to protect the environment from potential damage?
options:
Raise herds of deer to replace any species that are displaced.
Build smelters and processing plants on flat ground, not hillsides.
Prevent mining wastes from entering water sources and the air.
Allow only nitrogen and sulfur compounds to be released into the air.
Answer:
Prevent mining wastes from entering water sources and the air
What kind of eclipse is this
Total solar eclipse
Lunar
Annular
Partial lunar eclipse
Suppose you learn that November is the main termite-fishing season, when chimps spend a large part of their time eating termites. Predict how the chimp diet might be different in the month of May
Which representation of a hydrogen molecule is not correct?
Hydrogen is the element with atomic number one. The representation of the hydrogen molecule with a double bond is incorrect.
What is a double bond?A double bond is a type of chemical bond that involves two pairs or four bonding electrons of the atom in a molecule. They are stronger and shorter bonds compared to single bonds.
A hydrogen molecule can never have a double bond in its molecule as it has only a single electron in its shell and cannot form a double bond due to the lack of four electrons.
Therefore, hydrogen molecules cannot form a double bond.
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Plssssss helppppp
branliest
write the balanced complete ionic equation for the reaction when ammonium carbonate and calcium chloride are mixed in aqueous solutionif no reaction occurs, simply write only nr.
express your opinion against the theory of evolution
Answer:
The Theory of Evolution
Explanation:
it had many struggles but think of how we grew I agree with the theory of evolution because it has shown that studies of animals were here before humans
What is the process that keeps heat from being transferred between two substances is
Answer:
Conduction, Convection, and Radiation .......
(Please Help!) Aluminum reacts with oxygen to produce aluminum oxide (AI203). The balanced chemical equation for this reaction is: *see attachment*
How many oxygen atoms are in the reactants and in the products?
Why does the reaction of aluminum with oxygen illustrate the law of conservation of mass?
#1
Moles of Oxygen =3
Molecules:-
3×Avagadro no3(6.022×10²³)18.066×10²³1.8066×10²²molecules#2
Its because according to law of conservation of mass- Mass is neither created nor destroyed
AS ITS BALANCED SO BOTH SIDES ARE SAME .
HENCE THEY OBEY
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
As per the given reaction, we can clearly observe that :
#1. How many Oxygen atoms are there in reactant and product side ?
- The number of Oxygen atoms is same as in reactant Side and product side, that is 6 atoms ~
#2. How does the reaction illustrate the law of conservation of mass ?
- According to law of conservation of mass, mass can neither be created nor be destroyed in a chemical reaction. so the mass of each element on reactant Side should be equal to that in the product side.
Now, let's check out if it's true for the given reaction ~
Mass on reactant side :[tex]\qquad \sf \dashrightarrow \: 4(27) + 3(32) = 2 \{(2 \sdot27) + (3 \sdot16) \}[/tex]
[tex]\qquad \sf \dashrightarrow \:108 + 96= 2 \{54+ 48\}[/tex]
[tex]\qquad \sf \dashrightarrow \:204= 2 \{102\}[/tex]
[tex]\qquad \sf \dashrightarrow \:204= 204[/tex]
Hence, it's verified ~ that it follows law of conservation of mass ~
Balance this equation
H2SO4 + MgCl2 = MgSO4 + HCI
Answer:
1 H2SO4+ 1 MgCl2 = 1 MgSO4+ 2HCl
Is the dissolution of borax in water a temperature dependent reaction or is it spontaneous at all temperatures at which water is liquid? briefly explain
The dissolution of borax in water is a temperature dependent reaction. With the higher temperature, the salt dissolve quickly.
What is borax?
Borax is the hydrate salt of boric acid. It is white and widely used in cleaning and in laundry detergent.
Borax is a salt that will dissolve in water at almost any temperature, with the exception of steam and ice.
However, as with any salt, the higher the temperature, the faster the salt dissolves, so speed is dependent on temperature. It will dissolve in cold water, but it will take longer.
Thus, the dissolution of borax in water is a temperature dependent reaction.
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