What is an element?
CBA #2 Review

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Science
•
7th 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 copper (Cu), nitrogen (N2), and hydrogen (H2).
2.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more elements are chemically bonded together. For example, sodium chloride (NaCl) is a compound made from sodium (Na) and chlorine (Cl).
3.
FLASHCARD QUESTION
Front
What is the average speed formula?
Back
Average speed = Total distance / Total time.
4.
FLASHCARD QUESTION
Front
Calculate the average speed of a dog that traveled 12.0 kilometers in 3.0 hours.
Back
Average speed = 12.0 km / 3.0 hr = 4.0 km/hr.
5.
FLASHCARD QUESTION
Front
What effect do smaller salt crystals have on the rate of dissolving in water?
Back
Smaller salt crystals increase the surface area, which speeds up the dissolving process.
6.
FLASHCARD QUESTION
Front
What is the definition of physical properties?
Back
Physical properties are characteristics of a substance that can be observed or measured without changing the substance's identity, such as color, melting point, and density.
7.
FLASHCARD QUESTION
Front
What is the difference between a mixture and a compound?
Back
A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed from two or more elements that are chemically bonded.
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