unit 1 chemistry (2.1) chemical reactions (p112-113)

UNIT 1CHEMISTRY

(2.1) Chemical Reactions (p112-113)

BIG IDEAS

• Chemicals react with one another in predictable ways.

• Chemical reactions are a necessary component of chemical products and processes used in the home and workplace.

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How do chemical reactions affect your life?How do chemical reactions affect your life?

The images above all represent practical applications of chemical reactions.

What chemical reaction is occurring in each example?

Chemical Reaction

• A change in matter that produces new substances with new properties.

• Examples: • Change in colour• Change in temperature (heat)• Change in smell (gas or bubbles)

Physical Change

• A change in which no new substances are produced.

• The substance simply changes its appearance.

• Examples:• Change in state (solid/liquid/gas)• Change in shape

Reactions

Reactants • the starting materials in a reaction.

Products• the new materials formed in a reaction.

Chemical Equation

Describes a chemical reaction

reactants products

Note: The symbol () can be read as yields or forms or produces

Chemical Equation

Example:magnesiun + oxygen magnesium oxide

what reacts what is produced (reactants) (products)

Chemical Reactions of Life

• Photosynthesis

CO2 + H2O C6H12O6 + O2

• Cellular respiration

C6H12O6 + O2 CO2 + H2O

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Chemical Reactions at Home and at WorkChemical Reactions at Home and at Work

Many different chemical products are found in your home, including cleaners, foods, and food ingredients. All of these products are produced using chemical reactions or are used to make chemical reactions happen.

Vinegar is a common household chemical that is produced by diluting (watering down) acetic acid. As shown on the left, this chemical is used to make a variety of products.

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Chemical compounds require safe handling to minimize their hazards.Chemical compounds require safe handling to minimize their hazards.

Hazardous chemicals can be found in laboratories, in industries, and in your home. Labels on the chemicals explain possible hazards.

HHPS (Hazardous Household Product Symbols) use different shapes and easy-to-recognize icons to display basic safety information about a product.

Hazards in the Home

Copyright © 2010 McGraw-Hill Ryerson Ltd.

Chemical compounds require safe handling to minimize their hazards.Chemical compounds require safe handling to minimize their hazards.

Workplaces such as restaurants, repair shops, industrial plants, and schools have many hazardous substances.

WHMIS (Workplace Hazardous Materials Information System) labels provide detailed information about how to store, handle, and dispose of chemical substances. The labels also provide first aid information.

Hazards in the Workplace

Copyright © 2010 McGraw-Hill Ryerson Ltd.

Chemical compounds require safe handling to minimize their hazards.Chemical compounds require safe handling to minimize their hazards.

WHMIS (Workplace Hazardous Materials Information System) symbols are used to identify dangerous materials.

Describe the hazard represented by each of the symbols on the left.

What products might carry these labels?

Copyright © 2010 McGraw-Hill Ryerson Ltd.

Chemical compounds require safe handling to minimize their hazards.Chemical compounds require safe handling to minimize their hazards.

MSDS (Material Safety Data Sheet)

Hazardous workplace chemicals must come with an MSDS (Material Safety Data Sheet) such as the one shown below.

After examining the sample MSDS on the left, list the information that an MSDS must include.

CLASS WORKSafety symbols• See and study p xv at the front of your text

book • Do WB p5

quiz on safety symbols on Friday

(2.1) -Chemical Reactions• Do WB p38-43