Physical and Chemical Properties Lesson

A student pours a teaspoon of salt into a glass of water. The student stirs the water until the salt dissolves completely. Afterward, the student cannot see the salt in the water. What kind of substance has the student made? (Lesson 1)

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

The chemical equation shows how nickel oxide (Ni₂O₃) changes into nickel atoms (Ni) and oxygen molecules (O₂). How many total atoms of nickel are involved in this reaction? (Lesson 5)

• 2

• 4

• 8

• 9

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NGSS.MS-PS1-5

The boiling point of nitrogen is -196°C. The melting point of nitrogen is -210°C. At which temperature does nitrogen MOST LIKELY condense, or change from a gas to a liquid? (Lesson 3)

• -14°C

• -196°C

• -210°C

• -406°C

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NGSS.MS-PS1-4

Which situation involves a precipitate forming? (Lesson 4)

• Water condenses in clouds and falls to the ground.

• An iron fence outdoors is rained on repeatedly and begins to rust.

• Salt is poured into water, and the water is stirred until the salt dissolves completely.

• Two liquid solutions are mixed together, and a yellow solid forms at the bottom of the container.

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NGSS.MS-PS1-2

The model represents the particles found in a sample of a hard, shiny, solid substance. How should the substance be classified? (Lesson 1)

• as a mixture

• as an element

• as a compound

• as a pure substance

Tags

NGSS.MS-PS1-1

Aluminum (Al) and bromine (Br) react to form aluminum bromide. Which chemical equation correctly describes this reaction? (Hint: It's balanced) (Lesson 5)

• Al + Br₂ → 2AlBr₂

• 2Al + Br₂ → 3AlBr

• 2Al + 3Br₂ → 2AlBr₃

• 2Al + 3Br₂ → 2AlBr

Tags

NGSS.MS-PS1-5

Which of these represents an element? (Lesson 1)

• Pb

• PbS

• CO₂

• NaCl

Tags

NGSS.MS-PS1-1

Which two elements are most likely to have similar physical properties?

• A. copper and zinc

• B. copper and silver

• C. cadmium and indium

• D. gallium and cadmium

How are elements organized in the periodic table?

• by density and date of discovery

• by atomic number and properties

• by atomic mass and melting point

• by abundance in nature and usefulness to humans

How do atoms of copper differ from atoms of aluminum?

• They are not pure substances.

• They have different chemical properties.

• They can be formed by physical changes.

• They are made up of more than one type of particle.

Tags

NGSS.MS-PS1-1