Mod J Unit 1 Lesson 2 - Atoms and Elements

two or more atoms held together by chemical bonds

• pure substance

• molecule

• compound

• element

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NGSS.MS-PS1-1

a pure substance made up of two or more different types of atoms joined by chemical bonds

• pure substance

• molecule

• compound

• element

Tags

NGSS.MS-PS1-1

Which of these substances is a compound?

• gold (Au)

• nitrogen (N)

• carbon (C)

• quartz (SiO2)

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NGSS.MS-PS1-1

Choose all that apply for complex molecules

• contain only a few atoms bonded together

• may contain thousand of atoms

• often form a repeating pattern

• only made up of one type of atom

Tags

NGSS.MS-PS1-1

A molecule of water is composed of two hydrogen atoms chemically bonded to one oxygen atom. How many atoms make up one molecule of water?

• 2

• 3

• 4

• 5

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NGSS.MS-PS1-1

The structure of a complex molecules' particles

• bonded together in a repeating pattern

• loosely bonded in random pattern

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particles arranged in amorphous form will be

• less ordered and uniform than a crystalline form

• more ordered and uniform than a crystalline form

What do models of molecules and extended structures show? Select all that apply

• number of atoms

• type of atoms

• arrangement of atoms

• bonds between atoms

Tags

NGSS.MS-PS1-1

A substance in which the particles are arranged in an orderly, geometric, and repeating pattern is called a(n)

• molecule

• crystal

• octagon

• compound

Two substances can be made up of the same type of atom, yet have completely different properties

• True

• False