Midpoint Chemistry

Tiana is a chemist who is making a chemical to add to swimming pools in order to make the water safer. She mixed two solid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances. After mixing, Tiana found two liquid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?  

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Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

This C "token" in the model below represents a(n)

• atom

• repeating groupd of atoms

• extended structure

• molecule

Tags

NGSS.MS-PS1-1

The K and Cl "tokens" within the black box in the model represents

• atom

• repeating group of atoms

• extended structure

Tags

NGSS.MS-PS1-1

The C and H "tokens" together in the model below represent

• atom

• repeating groups of atoms

• extended structure

• molecules

Tags

NGSS.MS-PS1-1

How many valence electrons does Potassium Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Made up of only 1 type of atom

• Compound

• Molecule

• Element

• Mixture

An element is

• Made up of different types of atoms

• Made up of the same type of atoms

• none of the above

• all of the above

Tags

NGSS.MS-PS1-1

How many valence electrons does Silicon Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Tags

NGSS.MS-PS1-1

This is a shiny liquid. The melting point is -39 ⁰C and the boiling point is 357 ^oC. It conduct electricity. It is a ​ (a)   . It is toxic. It has been used in thermometer. It is​ (b)  

• metal

• mercury

• non-metal

• copper

• carbon

• sodium

Which of these samples shown best represents an element?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1