CHEM 120 Final Exam Review (Latest 2023 - 2024)
New Full Exam Questions and Answers ( Included ) 100% Correct
- significant figures
Answer: a digit that is either reliably known or closely estimated
- Significant Figure Rules
Answer:
- All non-zero digits are always significant
- Zeroes between non-zero digits are always significant
- Zeroes to left of first non-zero digit (either before or after decimal point) are never
- Zeroes to the right of last non-zero digit
- after decimal point are always significant
- which are before decimal point are not significant
significant
- conversion factor
Answer: relationship between two quantities expressed as a fraction
- dimensional analysis
Answer: conversion of a measurement in one unit into another by the use of
conversion factors
5. T/F: number of protons never changes according to periodic table
Answer True
- number of protons
Answer: atomic number=
- number of neutrons
Answer: mass number=
- isotopes
Answer: atoms with same number of protons (same electron) but different number
of neutrons 1 / 2
- atomic mass
Answer: weighted average of the isotopic masses of all stable isotopes of an element
- compound
Answer: substance composed of 2+ elements that are chemically combined
- molecular compound
Answer: compound in which atoms are held together by covalent bonds
- ionic bond
Answer: nonmetal and metal (giving away of electrons by one and receiving by the other); electrostatic interactions between positive and negative ions
- covalent bond
Answer: 2 nonmetals (sharing of bonds); the sharing of electrons be- tween two
atoms
- ion
Answer: atom that has an electrostatic charge
- cation
Answer: positively charged atom
- anion
Answer: negatively charged atom
- formula unit
Answer: simplest whole number ratio of ions in ionic compound
- / 2