LI-1-chemical and physical reaction Flashcards
(27 cards)
What are physical changes?
Physical changes alter a substance only in the movement or the arrangement of its particles.
Examples include freezing, boiling, dissolving, and crushing.
What happens to particles during a physical change?
The particles themselves remain unchanged.
This affects the physical structure or outward appearance.
What are chemical changes?
Chemical changes alter the particles themselves by rearranging atoms into new combinations, forming new chemical substances.
Examples include burning, rusting, and decomposition.
What are the three processes involved in chemical changes?
- Elements combining to form compounds
- Compounds breaking down into simpler substances
- Compounds reacting and recombining to form new compounds
Do new substances involve the creation of new matter?
No, the original atoms are simply rearranged in new combinations.
The formation of new compounds does not create new matter.
What occurs when compounds form?
Atoms of the elements involved become chemically bonded together.
This results in compounds having unique properties.
How are compounds different from their component elements?
Compounds have their own unique properties and chemical behaviour.
For example, copper sulfate is different from copper, sulfur, and oxygen.
How can compounds be separated?
Compounds can only be separated by chemical means.
Physical techniques cannot break chemical bonds.
Fill in the blank: Physical ____________ such as evaporating, crushing and ____________ alter the physical arrangement of particles in a substance but no ____________ substances are formed.
changes, dissolving, new
Fill in the blank: Chemical changes such as rusting, decomposing and ____________ alter the particles themselves.
burning
Fill in the blank: Although this forms new chemical substances, no new matter is ____________.
created
Fill in the blank: Instead, atoms are ________________ into new combinations.
rearranged
Fill in the blank: Particles in a compound are chemically ____________ together and can only be separated by ____________ processes.
bonded, chemical
Identify whether charring of wood involves a physical or a chemical change.
Chemical change
Identify whether melting of ice involves a physical or a chemical change.
Physical change
Identify whether boiling of water involves a physical or a chemical change.
Physical change
Identify whether dissolving sugar in a cup of coffee involves a physical or a chemical change.
Physical change
Identify whether dissolving magnesium in hydrochloric acid to form hydrogen gas and magnesium chloride involves a physical or a chemical change.
Chemical change
Identify whether crushing food by the teeth involves a physical or a chemical change.
Physical change
Identify whether breakdown of starch into sugars by enzymes in saliva involves a physical or a chemical change.
Chemical change
Identify whether formation of glucose from water and carbon dioxide in the leaf of a plant involves a physical or a chemical change.
Chemical change
Identify whether respiration in cells of living organisms to release energy from food involves a physical or a chemical change.
Chemical change
Identify whether water freezing into an ice block involves a physical or a chemical change.
Physical change
Identify whether egg white solidifying as it is cooked involves a physical or a chemical change.
Chemical change
