What is an element?
Chemical Changes Review

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Science
•
6th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include gold (Au), oxygen (O), and silver (Ag).
2.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more elements are chemically bonded together. An example is water (H2O), which is made of hydrogen and oxygen.
3.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a process where one or more substances are transformed into different substances with new properties. Examples include rusting iron and burning wood.
4.
FLASHCARD QUESTION
Front
What are some indicators of a chemical change?
Back
Indicators of a chemical change include a change in color, the formation of a gas (bubbling or fizzing), the formation of a precipitate (solid), and a change in temperature.
5.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting ice and dissolving sugar in water.
6.
FLASHCARD QUESTION
Front
What happens during a chemical reaction?
Back
During a chemical reaction, reactants are transformed into products, which have different properties than the reactants.
7.
FLASHCARD QUESTION
Front
What is the difference between a physical change and a chemical change?
Back
A physical change does not change the chemical composition of a substance, while a chemical change results in the formation of new substances.
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