Fall Semester Final Review
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
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.
2.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change occurs when a substance transforms into a different substance with different properties. This often involves a chemical reaction, such as rusting or burning.
3.
FLASHCARD QUESTION
Front
What is the formula for calculating the number of elements in a compound?
Back
The number of different elements in a compound can be determined by identifying the unique symbols in its chemical formula.
4.
FLASHCARD QUESTION
Front
What is dissolution?
Back
Dissolution is the process by which a solute (like a solid) dissolves in a solvent (like water) to form a solution.
5.
FLASHCARD QUESTION
Front
What factors affect the rate of dissolution?
Back
The rate of dissolution can be affected by temperature, surface area of the solute, stirring, and the nature of the solute and solvent.
6.
FLASHCARD QUESTION
Front
What is thermal energy?
Back
Thermal energy is the total kinetic energy of particles in a substance, which is related to its temperature.
7.
FLASHCARD QUESTION
Front
What are the three methods of thermal energy transfer?
Back
The three methods of thermal energy transfer are conduction, convection, and radiation.
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