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Chemical Reactions Summary

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Use the words listed below to complete the sentences and create a summary of our topic on chemical reactions.

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À propos de Compléter
science
chemistry
reactions
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Belinda Schirmer
Belinda Schirmer
Australia

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Chemical Reactions Summary

Use the words listed below to complete the sentences and create a summary of our topic on chemical reactions.

Belinda Schirmer
1

combustion reversed reversible melting chemical

Changes can be classified as physical or .
In a physical change no new substances are formed and the change is usually readily .
In a chemical change one or more new substances are formed and the process is not easily .
The burning of a candle involves both physical and chemical changes . The of the wax is a physical change and the of the wax vapour is a chemical change .

2

concentration products corrosion reactants surface monoxide dioxide rate water equations galvanising

In a chemical reaction the starting materials are called the and the substances that are formed are called the .
Word can be used to describe the chemical change .
Rusting is an example of , which is a chemical change .
Iron rusts in the presence of oxygen and . The rust that forms is an hydrated iron oxide .
Rusting can be prevented by coating the iron with a more active metal such as zinc . This process is called .
The speed at which a reaction occurs is called the reaction .
The rate of a reaction can be increased in a number of ways depending on the example . Increases in temperature and and the presence of a catalyst increases the rate . In the case of solids , an increase in area increases the rate . In the case of gases an increase in gas pressure will increase the rate .
When a fuel burns in the presence of air or oxygen heat is produced . If the fuel is a hydrocarbon , then carbon and water are formed unless the oxygen supply is limited . In a restricted supply of air the fuel will also burn to form carbon ( soot ) and carbon .

3

antacids acidic basic nitrogen neutralise

Acids are substances that bases to produce salts and water . Indicators can be used to determine whether a substance is an acid or a base .
The pH scale is used to classify acids and bases . If the pH is less than 7 , then the substance is . If the pH is above 7 , then the substance is .
Acidic gases such as sulfur dioxide and dioxide produce acid rain when they dissolve in rain . Acid rain can cause significant environmental destruction .
Indigestion can be relieved by using , which neutralise excess acidity in the stomach .

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