6.5A Elements and Compounds

6.5A Hydrochloric acid, HCl , is one of the substances found in gastric acid, which helps break down food in the digestive system. What is hydrochloric acid?

• A mixture of hydrogen and chlorine atoms

• A compound of hydrogen and chlorine atoms

• An element made of hydrogen and chlorine atoms

• A precipitate made of hydrogen and chlorine atoms

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6.5A The list in the box below shows three different substances.

I. Lithium

II. Sodium

III. Magnesium

Which of the following is correct about these substances?

• I, II, and III are pure substances, represented by the symbols Li, Na, and Mg, respectively.

• I and II are pure substances, represented by the symbols L and S, respectively

• I and III are pure substances, represented by the symbols Li and Mn, respectively.

• II and III are pure substances, represented by the symbols Na and Ms, respectively.

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6.5A This picture represents which of the following?

• atom

• element

• compound

• mixture

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6.5A This picture represents which of the following?

• atom

• element

• compound

• mixture

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6.5A This picture represents which of the following?

• atom

• element

• compound

• mixture

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6.5A Which of the following represents an element?

• H₂O

• H₂

• NaCl

• CaCO₃

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6.5A Is Iron (Fe) an element or a compound?

• element

• compound

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6.5A Is water (H₂O) an element or a compound?

• element

• compound

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Q. 

6.5A How many different types of atoms are there in the following molecule?

• 7

• 6

• 3

• 8

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6.5A . What is an element?

• A substance that is made up of one type of atom and can't be reduced to simpler substances.

• A substance made of two or more different atoms chemically bonded to one another. They can only be destroyed by chemical processes.

• A material containing two or more elements or compounds that are in close contact and are mixed in any proportion. They can be separated by physical means.