Whitch of the following are physical changes ? Rusting
Souring
Melting
Boiling
Freezing
Answers
Answer:
melting, freezing, and boiling are physical changes
Explanation:rusting and souring are ex. of chemical, not physical
Answer:
melting boiling frezzing
Explanation:
Related Questions
74. Which two temperatures are identical for the same substance?(A) melting point, freezing pointB) melting point, boiling pointC) freezing point, boiling pointD) freezing point, condensation point
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A 2-kg bowling ball is 2.5 meters off the ground on a post when it falls. Just before it reaches the ground, it is traveling 7 m/s. Assuming that there is no air resistance, which statement is true?The initial potential energy is less than the final kinetic energy. The intial potential energy is greater than the final kinetic energy. The mechanical energy is conserved. The mechanical energy is not conserved.
19. Which atom in a water molecule has the greatest electronegativity?a. one of the hydrogen atomsb. both hydrogen atomsc. the oxygen atomd. There is no difference in the electronegativities of the atoms in a water molecule.
It would increase because of less gravity
It would decrease because of less gravity
None of the above
Answers
Answer:
Explanation:
you are on the moon or on Earth. Mass is an intrinsic property of matter and is a measure of the amount of matter in an object. It does not depend on the location of the object or the gravitational field it is in. Therefore, your mass would be the same on the moon as it is on Earth.
It would be the same on the moon as on Earth
Answers
Answer:
the acceleration i think is 10
Explanation:
5x10=50
light energy
mechanical energy
heat
Answers
Answers
2. AlCl3
3. H2O
4. Cu
Answers
Final answer:
Among the substances listed, copper (Cu) is the one that can't be decomposed by a chemical change. This is because it is an element, composed of a single type of atom, and does not break down further in a chemical reaction.
Explanation:
The substance that cannot be decomposed by a chemical change among the given options is Cu, which stands for copper. In the context of chemistry, substances that cannot be decomposed into simpler substances by chemical means are called elements. Copper, denoted by the symbol Cu, is one such element. Unlike compounds such as HI, AlCl3, and H2O, elements like copper are composed of a single type of atom and therefore cannot be broken down further through chemical reactions.
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Final answer:
The substance that cannot be decomposed by a chemical change is Cu (Copper) because it is an element and cannot be broken down into simpler substances through chemical changes.
Explanation:
The substance among the options provided that cannot be decomposed by a chemical change is Cu or Copper. This is because Copper is an element, and elements are substances made up of only one type of atom. They cannot be broken down into simpler substances by chemical reactions. On the other hand, HI (Hydroiodic acid), AlCl3 (Aluminum chloride), and H2O (Water) are all compounds, which consist of two or more elements chemically combined in a fixed ratio. These can be decomposed into their constituent elements through various chemical reactions.
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Answers
Answer:
0.01M
Explanation:
Given paramters:
Volume of FeCl₂ = ?
Concentration = 0.945M
Number of molecules of O₂ = 4.32 x 10²¹molecules
Solution:
The balanced reaction equation is given below:
4FeCl₂ + 3O₂ → 2Fe₂O₃ + 4Cl₂
Now, to solve the problem we use mole relationship between the compounds.
We work from the known to the unknown compounds. Here, the known is the oxygen gas because from the given parameters we can estimate the number of moles of the reacting gas.
number of moles of O₂ =
number of moles of O₂ =
number of moles of O₂ = 0.007mole
now, from the reaction equation we find the number of moles of the FeCl₂:
3 mole of O₂ reacted with 4 moles of FeCl₂
0.007mole of O₂ reacted with = 0.0096mole O₂
Now to find the volume of FeCl₂ we use the expression below;
volume of FeCl₂ =
=
= 0.01L
Final answer:
10.1 milliliters of 0.945 M solution of FeCl2 are required to react completely with 4.32 x10^21 molecules of O2.
Explanation:
Given the balanced chemical equation: 4FeCl2(aq) + 3O2(g) → 2Fe2O3(s) + 4Cl2(g) we know that 4 moles of FeCl2 react with 3 moles of O2. Avogadro's number (6.02 x 10^23) can be used to convert the given molecules of O2 into moles: 4.32 x 10^21 molecules of O2 is equal to 0.00718 Moles of O2.
Using stoichiometry and the molar ratio from the balanced equation, this amount of O2 would react completely with 0.00958 Moles of FeCl2. Given that the solution is 0.945 M (moles/liter), we can calculate the necessary volume of FeCl2 solution:
Volume = Moles / Molarity, therefore, Volume = 0.00958 Moles / 0.945 M = 0.0101 liters or 10.1 milliliters of 0.945 M solution of FeCl2 are required to react completely with 4.32 x10^21 molecules of O2.
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