Compounds and Mixtures
Flashcard
•
Chemistry
•
6th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more different atoms are chemically bonded together. Examples include H2O (water), NaCl (table salt), and CO2 (carbon dioxide).
2.
FLASHCARD QUESTION
Front
What is a mixture?
Back
A mixture is a combination of two or more substances that are not chemically combined. An example of a mixture is pizza, which contains various ingredients that retain their individual properties.
3.
FLASHCARD QUESTION
Front
What do subscripts in a chemical formula represent?
Back
Subscripts in a chemical formula indicate the number of atoms of each element present in a compound. For example, in H2O, the '2' indicates there are two hydrogen atoms.
4.
FLASHCARD QUESTION
Front
What is an example of a pure substance?
Back
Gold is an example of a pure substance, as it consists of only one type of atom and has a uniform composition.
5.
FLASHCARD QUESTION
Front
What distinguishes an element from a compound?
Back
An element is a pure substance that cannot be broken down into simpler substances by chemical means, while a compound is made up of two or more elements that are chemically combined.
6.
FLASHCARD QUESTION
Front
What is the difference between a homogeneous mixture and a heterogeneous mixture?
Back
A homogeneous mixture has a uniform composition throughout, such as saltwater, while a heterogeneous mixture has a non-uniform composition, such as a salad.
7.
FLASHCARD QUESTION
Front
What is the law of definite proportions?
Back
The law of definite proportions states that a chemical compound always contains the same proportion of elements by mass, regardless of the amount or source of the compound.
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