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chemistry ch. 1 & 2

QuestionAnswer
What is dimensional analysis? conversion of a quantity in one unit to a quantity in another
How many atoms are in exactly 1 mol of an element? 6.022 * 10^23 atoms
Are non zero digits significant or not? significant
Are zeros between digits significant or not? significant
Are zeros at the beginning of a number significant or not? not significant
When are zeros at the end of a number significant? when there is a decimal point
How many significant figures are in multiplication and division? factor with least amount of significant figures will determine
How many significant figures are in addition and subtraction? least significant decimal place
The formula for density is: mass/volume
Are columns or rows considered groups in the periodic table? Columns
Where are metals? left side
Where are nonmetals? right side
Where are metalloids? zig zag
Where are electrons found? traveling around the nucleus
Where are protons and neutrons found? in the nucleus
What has to be the same and what could be different? protons and electrons must be the same neutrons can be different
T or F? Isotopes have the same number of protons, electrons, and neutrons F. isotopes do not have the same number of neutrons
How many atoms are in a decimal of a mol? decimal * 6.022 10^23
How many moles are in a sample containing __ atoms of an element ? divide sample and 6.022 10^23 subtract notations
Mass of a certain mol? mass x elements mass
Molar mass? g/mol
How do you find an atom of a mole? elements mass / 6.022 10^23
Mass of 1 mol of an element? Elements atomic mass
How do you identify the element with the mass and number of atoms? atoms / 6.022 10^23 / mol
Mol of a certain mass? provided mass / elements mass
What is the mass of __ atoms? atoms / 6.022 10^23 *elements mass
Created by: jzach