Question

Which substance can be broken down by chemical means?
(1) CO (3) Ca
(2) Ce (4) Cu

Answer 1

The substance that can be broken down by chemical means from the choices given is CO  (Carbon monoxide).

Carbon monoxide is a compound made up of carbon and oxygen and can therefore be broken by chemical means.

Further Explanation

Pure substances  

• Pure substances are substances that have a constant composition and also cannot broken down into simpler substances using physical means.

• Pure substances are classified as either elements or compounds.

Elements

• Elements are a type of pure substances that are made up of one type of atom and cannot be broken down into simpler substances by both chemical and physical means.
• Atoms making up a certain element are similar or identical in properties. Examples of elements are, Oxygen, sodium, calcium, etc. Periodic table shows an arrangement of all known elements.

Compound  

• A compound is a pure substance that is made up of than one type of atoms of different elements and can be broken down into individual elements making it using chemical means.
• Compounds cannot be broken down into simpler substances by physical means but only using chemical means. Compounds have constant composition and therefore they have a constant ratio of elements. For example the ratio of elements making up carbon dioxide is always 27% Carbon and 73% Oxygen.
• Examples of compounds include, water, Ammonia, calcium sulfate, carbon dioxide, etc.
• In our case, Carbon monoxide, (CO) is a compound made up of a carbon atom and an oxygen atom. Other choices, Ca, Ce, and Cu are all elements.

Keywords: Compound, elements, pure substances  

Learn more about:

• Compounds: https://brainly.com/question/9493916
• Pure substances: https://brainly.com/question/12637406
• Elements: https://brainly.com/question/12443572

Level: High school

Subject: Chemistry  

Topic: Atoms, elements, compounds and mixtures  

Answer 2

CO (carbon monoxide) is the substance that can be broken down by chemical means.

• Pure substances are substances that have constant and definite composition. Elements and compounds are the two types of pure substances.

• Elements are pure substances that contain only one atom in definite proportion while a compound is a pure substance that contains more than one atom.

• Elements cannot be broken down into simpler substances by chemical means while the components of a compound can be broken down via chemical means.

• Calcium (Ca), Copper (Cu), Cerum (Ce) are elements while carbon monoxide (CO) are compounds that can be broken down.

• Therefore, CO (carbon monoxide) is the substance that can be broken down by chemical means.

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