Unit 2: Ch 2 & Ch 3 (Sig Fig, Dim.Anay, Isotopes, Moles)
Flashcard
•
Chemistry
•
11th - 12th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What are significant figures?
Back
Significant figures are the digits in a number that contribute to its precision, including all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.
2.
FLASHCARD QUESTION
Front
How do you determine the number of significant figures in a measurement?
Back
Count all non-zero digits, any zeros between them, and trailing zeros in a decimal number. Leading zeros are not counted.
3.
FLASHCARD QUESTION
Front
What is dimensional analysis?
Back
Dimensional analysis is a mathematical technique used to convert units from one system to another, ensuring that the final answer is in the desired units.
4.
FLASHCARD QUESTION
Front
How do you perform dimensional analysis?
Back
Identify the given quantity and its units, determine the conversion factors needed, and multiply the quantity by the conversion factors to cancel out the unwanted units.
5.
FLASHCARD QUESTION
Front
What is an isotope?
Back
Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, resulting in different mass numbers.
6.
FLASHCARD QUESTION
Front
How do you calculate the number of moles from particles?
Back
Use Avogadro's number (6.022 x 10^23) to convert particles to moles: Moles = Number of particles / Avogadro's number.
7.
FLASHCARD QUESTION
Front
What is the molar mass of a substance?
Back
The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol), and is numerically equal to the substance's atomic or molecular weight.
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