Elements and Compounds and Counting Atoms 7.6A and 7.6B Retest

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Science
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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. Each element is made up of atoms that have the same number of protons.
2.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more elements chemically bond together in fixed proportions. Compounds have different properties than the elements that make them up.
3.
FLASHCARD QUESTION
Front
How do you determine the number of elements in a chemical formula?
Back
Count the different element symbols present in the formula. For example, in Li2O, there are 2 elements: Lithium (Li) and Oxygen (O).
4.
FLASHCARD QUESTION
Front
What does a subscript in a chemical formula indicate?
Back
A subscript indicates the number of atoms of the element in the compound. For example, in H2O, the '2' indicates there are 2 hydrogen atoms.
5.
FLASHCARD QUESTION
Front
What does it mean if there is no subscript next to an element symbol?
Back
If there is no subscript next to an element symbol, it means there is only 1 atom of that element in the chemical formula.
6.
FLASHCARD QUESTION
Front
What is the difference between an element and a compound?
Back
An element is a single type of atom, while a compound consists of two or more different types of atoms bonded together.
7.
FLASHCARD QUESTION
Front
How many atoms are in the compound AgNO3?
Back
There are 5 atoms in AgNO3: 1 Silver (Ag), 1 Nitrogen (N), and 3 Oxygen (O) atoms.
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