TEKS C.4 Review

TEKS C.4 Review

Modules 1-4

Physical vs Chemical

• Physical changes

• Chemical Changes

• Physical Properties

• Chemical Properties

Multiple Choice

Which section shown on the MSDS lists a physical property of hydrochloric acid?

• Description

• Hazards

• Reactivity

• Flammability

How to know when a Chemical Change happens

• New Color

• New Odor

• Temperature Increase or Decrease

• New Substance

Multiple Choice

In which of the following scenarios is a chemical change taking place?

• Sodium metal reacts with water to form sodium hydroxide and hydrogen gas.

• Sugar dissolves when poured into tea.

• Liquid water turns to a vapor at 100°C.

• Quartz crystal fractures when struck.

Reactions

Reactions are always a Chemical Change. Also Reactivity is a Chemical Property. Not everything can react to something else.

Multiple Choice

Which of the following of the properties of sodium metal is a chemical property?

• Has a melting point of 98°C

• Readily reacts with oxygen

• Solid at room temperature

• Is more dense than water

Types of Properties

• Physical Properties

• Chemical Properties

• Intensive Properties

• Extensive Properties

Physical Properties

• You can identify using your 5 senses

• Can be observed or measured without changing the identity or composition of a substance.

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• 
  

Chemical Properties

• Includes all of the possible chemical changes that a substance can go through.

• 
  

Intensive Properties

• Identify

• Does not Depend on how much you have of it.

Extensive Properties

• Quantifying measures

• Depends on how much you have.