(2) argon (4) water
The substance that cannot be broken down by chemical reaction is .
Further Explanation:
Substance is the pure form of matter while combination of atoms or molecules is termed as a mixture.
Types of substances:
1. Element
The simplest form of substance that cannot be further broken down by any chemical method is known as an element. Carbon, sulfur, and cobalt are some of the examples of elements.
2. Compound
When two or more different elements are held together by chemical bonds, compounds are formed. These can further be broken down into their respective constituents. Their properties are quite different from those of their constituent elements. NaCl, and are examples of compounds.
(1) Ammonia consists of one nitrogen and three hydrogen atoms so it is a compound. Therefore it can be broken down by chemical reactions.
(2) Argon is an element so it is the simplest form in which it can exist. Therefore it cannot be broken down by chemical reactions.
(3) Methane consists of one carbon and four hydrogen atoms so it a compound. Therefore it can be broken down by chemical reactions.
(4) Water consists of one oxygen and two hydrogen atoms so it is a compound. Therefore it can be broken down by chemical reactions.
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Elements, compounds, and mixtures
Keywords: substance, methane, argon, ammonia, water, element, compound, chemical reactions, broken down, simplest form, NaCl, CH4, carbon, sulfur, cobalt.
The given Lewis structure does not show valid resonance form. So,the given statement is false.
The Lewis structure is the representation of the of valence shell in the molecule.
The electron present in outermost shell and which involve in chemical bond formation is called valence electron.
Resonance is way to explain the localisation of electron in molecule where Lewis formula fails to describe.
The given statement is false because both structure shows different number of valence electron.
To learn more about Lewis structure here.
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Answer:
true
Explanation:
because Lewis represent valid resonance
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Explanation:
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Physical Change is a substance it does not change. Arrangement of molecules changes.
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Example 1:
Type of Change:
Evidence:
Answer:
Example 1. One change I observed was when cooking, I needed to boil water. The water was later evaporated due to the increase of heat from the stove below the pot. Heat traveled and transferred from the stove to the pot then the water. This change is from liquid to gas.
Example 2. I was mixing sugar into my tea, the sugar dissolved into the tea. This is an example of dissolving a solid into a liquid. The tea took the properties of the sugar and turned the drink sweet.
Extra, taking a hot shower and steam leaves the shower. This change is of evaporation.
Explanation:
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B) Polaris
C) Both A & B
D) The north pole