Chemical change compound broken down

Metabolism All of the processes or chemical changes in an organism or a single cell by which food is built up (anabolism) into living protoplasm and by which protoplasm is broken down (catabolism) into simpler compounds with the exchange of energy. 

Matter can be either a pure substance or a mixture. Pure substances cannot be further broken down into simpler components through physical processes and can be either elements (one type of atom) or compounds (more than one type of atom). Mixtures can be homogeneous (aka. solutions) or heterogeneous. Heterogeneous mixtures exhibit phase boundaries, or sharp demarcations where the chemical and/or physical properties of the sample change. Mixtures are separable into pure substances through physical processes. 

B. carbon dioxide]—Elements cannot be broken down by a chemical change, but compounds can. 

A physical property of matter is a property that can be determined without inducing a chemical change (see Skill 11.1 g). The elemental percent composition of a substance (see Skill 4.1b) requires that the compound be broken down into its elements, and so it is a chemical property, not a physical one. 

Another defining feature of a compound is that its properties are different from those of its component elements. Table 2.1 shows a striking example. Soft, silvery sodium metal and yellow-green, poisonous chlorine gas have very different properties from the compound they form—white, crystalline sodium chloride, or common table salt Unlike an element, a compound can be broken down into simpler substances—its component elements. For example, an electric current breaks down molten sodium chloride into metallic sodium and chlorine gas. Note that this breakdown is a chemical change, not a physical one. 

For example, sodium and chlorine combine together to form sodium chloride, or salt. Sugar is formed from a combination of the elements carbon, hydrogen and oxygen. Chemical reactions, or chemical changes occur when new substances are formed elements react together to form compounds, or compounds can be broken down into their constituent elements by chemical changes. 

The atoms of certain elements have special affinities for each other. They bind together in special ways to form compounds, substances that have the same composition no matter where we find them. Because compounds are made of elements, they can be broken down into elements through chemical changes ... 

The thermally-reversible gel returns to the solution because the droving forces are noncovalent bonds such as hydrogen bonding, hydrophobic interaction, n-n interaction and electrostatic interaction. These noncovalent bonds are broken down by heating, so the gel reverts to the sol. Since the thermally-irreversible gel forms a network structure by firm chemical covalent bonds, the gel formed never changes to the sol. This is why the thermally-irreversible gel is called physical gel and the thermally-irreversible gel is referred to as chemical gel. Moreover, the gelation ability is found in not only biopolymers but also low molecular weight compounds. 

Unlike an element, a compound can be broken down into simpler substances—its component elements. For example, an electric current breaks down molten sodium chloride into metallic sodium and chlorine gas. By definition, this breakdown is a chemical change, not a physical one. 

A compound is a substance made up of two or more elements. It does not change its identity in physical changes, but it can be broken down into its constituent elements by chemical changes. 

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