Chemical Changes Flashcards
How do you tell if a change is chemical? (3)
1) news substances are formed.
2) properties of products are different from that of the reactants.
3) usually irreversible.
How can you tell if a change is physical? 3)
1) no new substances formed
2) properties of products same as reactants.
3) reversible.
When do chemical changes take place?
When matter interacts with heat, light or electricity
What might be given out or taken in during chemical change?
Heat and/or light
Define thermal decomposition.
Thermal decomposition is a process in which a substance is broken down into two or more simpler substances by the effect of heat.
When does rusting occur?
Rusting occurs when iron or steel reacts with oxygen in the presence of water or moisture.
What is oxidation?
Oxidation refers to the process in which a substance reacts with oxygen.
What is combustion?
Combustion refers to the combination of a substance with oxygen in the presence of heat. One or more new substances may be produced.
What is cellular respiration?
Cellular respiration is the process in which living cells of plants and animals take in oxygen to release energy stored in glucose.
What is photosynthesis?
Photosynthesis is the process in which green plants make food in the presence of light.
How do X-ray films work?
X ray films contain silver bromide crystals which are sensitive to x-rays and light. Silver bromide is converted to silver in the process. They are used to observe internal structures of a person’s body.
What is electrolysis?
Electrolysis is the process by which substances are decomposed into simpler substances when an electric current passes through them.
What is electroplating?
Electroplating is the application of a metal coating to a metallic or other conducting surface with the passage of an electric current.
What are the two types of changes?
Chemical and physical changes.
