Chemical Formulas
Flashcard
•
Science
•
8th Grade
•
Hard
+2
Standards-aligned
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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.
Tags
NGSS.MS-PS1-1
2.
FLASHCARD QUESTION
Front
How do you determine the number of atoms of an element in a chemical formula?
Back
The number of atoms of an element in a chemical formula is indicated by the subscript next to the element's symbol. If there is no subscript, it means there is one atom of that element.
3.
FLASHCARD QUESTION
Front
What is the difference between a chemical change and a physical change?
Back
A chemical change results in the formation of new substances with different properties, while a physical change does not alter the chemical composition of a substance.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
4.
FLASHCARD QUESTION
Front
What are the products of the reaction NH3 -> N2 + H2?
Back
The products of the reaction are nitrogen gas (N2) and hydrogen gas (H2).
Tags
NGSS.MS-PS1-1
5.
FLASHCARD QUESTION
Front
How many different elements are present in the compound C6H12O6?
Back
There are three different elements present in C6H12O6: carbon (C), hydrogen (H), and oxygen (O).
Tags
NGSS.MS-PS1-1
6.
FLASHCARD QUESTION
Front
What does the subscript in a chemical formula represent?
Back
The subscript in a chemical formula represents the number of atoms of the element in one molecule of the compound.
7.
FLASHCARD QUESTION
Front
What is the significance of balancing chemical equations?
Back
Balancing chemical equations is important because it ensures that the law of conservation of mass is obeyed, meaning that the number of atoms of each element is the same on both sides of the equation.
Tags
NGSS.MS-PS1-5
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