The substance that can be broken down by chemical means is
Further explanation:
<u>Pure substances
</u>
The substances that are made up of only one kind of atoms or molecules are known as pure substances. It is generally called as a chemical substance. Any substance is also said to be pure if it has a <em>constant composition</em>. Water, tin, diamond, sulfur, sodium chloride are some of the examples of pure substances.
Pure substances are of two types:
1. Elements:
An element is the <em>simplest form</em> of substance that cannot be broken down by any chemical methods. Every element has its own characteristic atomic number that is used to distinguish it from other elements. Copper, iron, neon, cobalt are examples of elements.
2. Compounds:
These are the substances formed by the <em>chemical combination</em> of two or more elements in a specific ratio. If the same elements are mixed in any other ratio, different compounds will be formed. These can be further broken down into their constituent elements.
<u>Mixtures:
</u>
The material that is made up of <em>two or more substances</em> is called a mixture. It has <em>no fixed formula</em> and has a <em>variable composition</em>. All the individual constituents retain their properties after the formation of the mixture. Air, blood, concrete, and soda are some examples of mixtures.
(1) CO is a compound that is formed by the chemical combination of two elements, namely carbon and oxygen and we know a compound can be broken down into its constituent elements. So this is a correct option.
(2) Ce is an element and we know element is the simplest form of matter that cannot be further broken down. So this is an incorrect option.
(3) Ca is an element and we know element is the simplest form of matter that cannot be further broken down. So this is an incorrect option.
(4) Cu is an element and we know element is the simplest form of matter that cannot be further broken down. So this is an incorrect option.
Learn more:
1. Which sample is a pure substance: brainly.com/question/2227438
2. Example of physical change: brainly.com/question/1119909
Answer details:
Grade: High School
Subject: Chemistry
Chapter: Elements, compounds, and mixtures
Keywords: mixture, pure substance, element, compound, chemical means, methods, formula, substances, composition, individual, constituents, Ce, CO, Cu, Ca, substance, broken down.