Chemical Reactions

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•
Science
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is an element?
Back
An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O), hydrogen (H), and gold (Au).
2.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and carbon dioxide (CO2).
3.
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, freezing, and dissolving.
4.
FLASHCARD QUESTION
Front
What is a chemical reaction?
Back
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another, resulting in the formation of new substances.
5.
FLASHCARD QUESTION
Front
What is pH?
Back
pH is a scale used to measure the acidity or basicity of a solution. A pH of 7 is considered neutral, below 7 is acidic, and above 7 is basic.
6.
FLASHCARD QUESTION
Front
What is an acid?
Back
An acid is a substance that donates protons (H+) in a chemical reaction and has a pH less than 7. Examples include hydrochloric acid (HCl) and sulfuric acid (H2SO4).
7.
FLASHCARD QUESTION
Front
What is a base?
Back
A base is a substance that accepts protons (H+) or donates hydroxide ions (OH-) in a chemical reaction and has a pH greater than 7. Examples include sodium hydroxide (NaOH) and ammonia (NH3).
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