Evidence of a Chemical Change
Flashcard
•
Science
•
6th - 8th Grade
•
Hard
Barbara White
FREE Resource
Student preview
6 questions
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1.
FLASHCARD QUESTION
Front
Chemical Change Noun
[kem-i-kuhl cheynj]
Back
Chemical Change
A process where one or more new substances are formed with different properties, and which is not easily reversed.
Example: When hydrochloric acid is added to iron powder, a chemical change occurs, producing gas bubbles as evidence that a new substance has been formed.
2.
FLASHCARD QUESTION
Front
Chemical Reaction Noun
[kem-i-kuhl ree-ak-shun]
Back
Chemical Reaction
A process that involves the rearrangement of molecular or ionic structures, resulting in the formation of new substances.
Example: Methane (CH₄) and oxygen (O₂) molecules rearrange their atoms to form new substances, carbon dioxide (CO₂) and water (H₂O), which is a chemical reaction.
3.
FLASHCARD QUESTION
Front
Reactants Noun
[ree-ak-tuhnts]
Back
Reactants
The starting substances in a chemical reaction that are consumed during the process to form new substances called products.
Example: The image labels the starting substances in a chemical reaction, methane (CH4) and oxygen (O2), as the 'Reactants' before they are transformed into new products.
4.
FLASHCARD QUESTION
Front
Products Noun
[prod-uhkts]
Back
Products
The new substances that are formed as the result of a chemical reaction between the initial starting materials.
Example: In a chemical reaction, the starting materials (reactants) rearrange to form new substances, which are called the products (carbon dioxide and water).
5.
FLASHCARD QUESTION
Front
Precipitate Noun
[pri-sip-i-teyt]
Back
Precipitate
An insoluble solid that emerges from a liquid solution during a chemical reaction, often settling at the bottom.
Example: This image shows that when some solutions are mixed, a new solid substance, called a precipitate, can form. This is evidence of a chemical change.
6.
FLASHCARD QUESTION
Front
Physical Change Noun
[fiz-i-kuhl cheynj]
Back
Physical Change
A change affecting the form of a substance, such as its state or shape, but not its chemical composition.
Example: This diagram shows how a substance can change its state (solid, liquid, gas) through processes like melting or freezing without changing its chemical identity.
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