A chemical change involves the formation or the breaking of bonds. true or false
Answers
Answer: The given statement is true.
Explanation:
A chemical change is a change that causes change in chemical composition of a substance.
This change is due to the exchange of electrons that lead to the formation or breaking of bonds.
For example, sodium atom on donating an electron to chlorine atom forms an ionic bond due to transfer of electron.
This formation of ionic bond leads to the formation of a new compound named as sodium chloride.
Therefore, we can conclude that the statement a chemical change involves the formation or the breaking of bonds, is true.
Final answer:
Chemical change involves the formation or breaking of bonds, leading to the formation of new substances.
Explanation:
A chemical change involves the formation or breaking of bonds. When a chemical change occurs, the atoms rearrange themselves, leading to the formation of new substances with different properties. This is different from a physical change, where no new substances are formed.
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Calculate the percent by mass of the solute in each of the following aqueous solutions: (a) 5.50 g of NaBr in 78.2 g of solution, (b) 31.0 g of KCl in 152 g of water, (c) 4.5 g of toluene in 29 g of benzene.
Answers
To solve this we must be knowing each and every concept related to experiment. Therefore, the correct option is option A that is to leave the room and go to an area with fresh air.
What is experiment?
Any procedure where measurements are taken and tests are run to support or disprove a hypothesis is referred to as a scientific experiment.
A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to leave the room and go to an area with fresh air.
Therefore, the correct option is option A that is to leave the room and go to an area with fresh air.
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b. N₂O₃
c. NO₂
d. NO
e. N2₂O
Answers
43,89g≈44g
44g == 2x 14g (N) + 1x 16x(O)
M N₂O = 44g
________________________
Answers
B. They will attract one another.
C. They will transfer their electrons from one to the other.
D. They will not affect one another.
Answers
Answer:
They will repel on another.
Answers
Explanation:
Hello!
Let's solve this!
An Arrhenius acid is a substance that, when dissolved, forms stainless hydrogen (H +)
An Arrhenius base is a substance that when dissolved produces oxhydryl ions (OH-).
For example:
hydrochloric acid: HCl
Nitric Acid: HNO3
Final answer:
An Arrhenius acid is a substance that releases hydrogen ions when dissolved in water. Examples can range from strong acids, like hydrochloric acid, to weak acids like vinegar. The concept was formulated by Svante Arrhenius, underlining the importance of hydrogen in the definition of acids.
Explanation:
An Arrhenius acid is specifically defined as a substance which, when dissolved in water, releases hydrogen ions (or protons). This includes strong acids like hydrochloric acid (HCl), which releases all of their hydrogen ions in solution, thereby becoming completely ionized. However, this also includes weak acids like vinegar, or acetic acid, which do not ionize completely and still leave some hydrogen ions within the compound.
These properties of acids were formulated by Svante Arrhenius in the late 19th century, underlining the importance of hydrogen in defining acids. The ability of acids to release hydrogen cations led to their definition as acid substances.
Thus, if a substance releases hydrogen ions into a solution when dissolved in water, it can be described as an Arrhenius acid.
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(2) the iron loses its metallic properties
(3) the sulfur gains magnetic properties
(4) the sulfur gains metallic properties
Answers
The mixture of iron sulfide formed is non-magnetic wherein iron looses its magnetic properties.
How do properties of compound differ from elements?
The properties of compound are different from those of the elements from which it is formed. The reason to this is when elements combine to form compounds ,the properties of elements are completely changed and have completely new set of properties.
When iron which has magnetic properties forms a mixture with sulfur iron sulfide is formed,which is non-magnetic.Here, the iron looses it's magnetic properties as it forms compounds with sulfur.
On combining with sulfur, compound formed is iron sulfide with no magnetic properties .Thus on moving the magnet over this mixture does not attract any iron particle towards it as the properties are completely altered when compounds are formed.
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