A substance that is made up of two or more elements is called ____.
Answers
If it is two or more elements are mixed, it is a mixture. If two or more elements are chemically reacted, it is a compound ( example FeS)
Hope this helps.
Related Questions
Make the following conversion. 0.075 m = _____ cm 7.5 75 0.0075 0.00075
Which formula represents an unsaturated hydrocarbon? Picture IHow many pairs of electrons are shared between the two nitrogen atoms? Picture III NEED EXPLANATION FOR BOTH QUESTIONS, PLEASE HELP ME! :)
Why do cats purr when they are happy?
Which of the following is an example of a covalent compound?
carbon dioxide and oxygen
glucose and oxygen
glucose and carbon dioxide
Answers
Answer: Since most of the dissolved CO2remains as CO2 molecules, Ka1(apparent) has a much larger denominator and a much smaller value than the true Ka1. The bicarbonate ion is an amphoteric species that can act as an acid or as a base, depending on pH of the solution. At high pH, it dissociates significantly into the carbonate ion (CO2−3):
Explanation: In organisms carbonic acid production is catalysed by the enzyme, carbonic anhydrase. CO2 is a potent electrophile having an electrophilic reactivity that is comparable to benzaldehyde or string α,β-unsaturated carbonyl compounds. However, unlike electrophiles of similar reactivity, the reactions of nucleophiles with CO2 are thermodynamically less favored and are often found to be highly reversible. Only very strong nucleophiles, like the carbanions provided by Grignard reagents and organolithium compounds react with CO2 to give carboxylates. In metal carbon dioxide complexes, CO2 serves as a ligand, which can facilitate the conversion of CO2 to other chemicals. The reduction of CO2 to CO is ordinarily a difficult and slow reaction:
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The two subspecialty of astronomy are astrophysics and planetaryscience. Correct option is D.
Astronomy is the scientific study of celestial objects, such as stars, planets, galaxies, and other phenomena in the universe. Within the field of astronomy, there are several subspecialties that focus on specific aspects of celestial objects and phenomena.
Astrophysics: Astrophysics is a branch of astronomy that deals with the physical properties, behavior, and interactions of celestial objects. It involves the application of physics principles and theories to understand the nature of stars, galaxies, black holes, and other cosmic phenomena. Astrophysicists study the processes that govern the birth, evolution, and death of stars, as well as the formation and dynamics of galaxies.
Planetary Science: Planetary science is another subspecialty of astronomy that focuses on the study of planets, moons, asteroids, comets, and other objects within our solar system and beyond. Planetary scientists investigate the geology, atmospheres, surfaces, and composition of planets and their satellites. They also study the origin and evolution of planets, the potential for habitability, and the possibility of past or present life on other celestial bodies.
Both astrophysics and planetary science are essential in expanding our understanding of the cosmos. Astrophysics helps us comprehend the fundamental principles and processes that govern the entire universe, while planetary science provides insights into the unique characteristics and properties of the planets and bodies within our solar system, shedding light on potential habitability and the origins of life.
To know more about astronomy:
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Answers
4Fe+3O₂⇒2Fe₂O₃
We know that the mole of Fe₂O₃ is 6, and since the ratio between oxygen and Fe₂O₃ is 3:2, we can see that
3:2 = x:6 (3 oxygen moles can make 2 Fe₂O₃ moles = x oxygen moles can make 6 Fe₂O₃ moles)
Multiply outside and inside (3*6 , 2*x) and put them on opposing sides of the equation
2*x = 3*6
2x=18
x=9
Therefore 9 moles of oxygen is needed.
Answers
D = m / V
1.02 = m / 125
m = 1.02 x 125
m = 127.5 g of H2O
127.5 / 1000 => 0.1275 kg
mass of solute in mg:
1000 x ( 1.86 x 10⁻⁵ ) = 0.0186 mg
ppm = mass of solute in mg / mass of solvent in kg
ppm = 0.0186 / 0.1275
= 0.1458 ppm
hope this helps!
Answer:
C
Explanation:
(2) 2.0-L cylinder of CH4(g)
(3) 1.5-L cylinder of NH3(g)
(4) 4.0-L cylinder of He(g)
Answers
PV=nRT we can say that with everything constant, volume must also be constant.
The answer is (2) 2 L of methane gas.
2.0-L cylinder of CH₄ (g) contains the same number of gas molecules at STP as a 2.0-liter rigid cylinder containing H₂(g) at STP.
What is ideal gas equation?
It is a hypothetical approximation of the behavior of many gases under many condition, and expressed as PV = nRT.
As in the question it is given that rigid cylinder have the same temperature and pressure i.e. have a standard temperature and pressure. According to the Avogadro's Law, under the same temperature and pressure if equal amount of gas is taken then no. of moles of gases are same.
Ideal gas equation PV = nRT justifies the above statement.
So, from the given 2.0-L cylinder of CH₄ (g) contains the same number of gas molecules at STP.
Hence, option (2) is correct i.e. 2.0-L cylinder of CH₄ (g) contains the same number of gas molecules.
To learn more about ideal gas, visit below link:
Answers
So:
160g ---------- 6·10²³molecules
79g ---------- x
x = 2.9625·10²³ molecules
1molecule = 5 atoms
2.9625·10²³ molecules = 2.9625·10²³·5 = 14.8125·10²³ atoms