Chemical Formula Review

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•
Science
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a chemical formula?
Back
A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound or molecule.
2.
FLASHCARD QUESTION
Front
What does the subscript in a chemical formula indicate?
Back
The subscript indicates the number of atoms of the element in the molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.
3.
FLASHCARD QUESTION
Front
What is the difference between an element and a compound?
Back
An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different types of atoms bond together.
4.
FLASHCARD QUESTION
Front
How do you determine the total number of atoms in a chemical formula?
Back
To find the total number of atoms, add up all the atoms represented in the formula, considering the subscripts. For example, in 2NH3, there are 2 Nitrogen and 6 Hydrogen atoms, totaling 8.
5.
FLASHCARD QUESTION
Front
What elements are present in the compound NaCl?
Back
Sodium (Na) and Chlorine (Cl).
6.
FLASHCARD QUESTION
Front
What is the chemical formula for water?
Back
H2O.
7.
FLASHCARD QUESTION
Front
What does a pH level of 0.8 indicate about a substance?
Back
A pH level of 0.8 indicates that the substance is highly acidic.
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