ACS Chemistry 101 & 102 Final Exam Review Questions and Answers | 100% Pass

ACS Chemistry 101 & 102 Final Exam Review Questions and Answers | 100% Pass What is the difference between a homogeneous and heterogeneous mixture? Can they be separated? - ️️ Correct-A homogeneous mixture is a uniform composition throughout whereas a heterogeneous mixture has other substances. They can be separated but through physical processes. What is the difference between a physical and chemical property? Physical vs chemical change? - ️️ Correct-A physical property is one that can be determined without changing the identity of the matter. A physical change is where the identity of the matter does not change. A chemical property is a property (only determined as a result of a chemical change or chemical process) in which the original substance is converted to a different substance. Whats the difference between an extensive property and an intensive property? - ️️ Correct-An extensive property is dependent on the amount of matter. TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 2/10 An intensive property is independent of the amount of matter. List the SI units in chemistry. Derived Units? - ️️ Correct-1. Mass - Kilogram (kg) 2. Temperature - Kelvin (K) 3. Time - Seconds (s) 4. Length - Meter (m) 5. Amount of substance - Moles (mol) 6. Electric Current - Ampere (A) Derived Units: Density (g/mL) and Volume (mL or cm³) Whats the difference between accuracy and precision? - ️️ Correct-Accuracy refers to how close measured numbers are to the true value. Precision refers to how close measured numbers are to one another. What are the different types of radioactivity atoms give off? - ️️ Correct-Alpha rays composed of positively charged a particles. Beta rays are composed of negatively charged B particles. TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 3/10 Gamma rays composed of neutral y rays or gamma particles. What is Z vs A representing an atom? - ️️ Correct-Atomic number (Z) is the number of protons in the nucleus of an atom. Mass number (A) is the sum of protons and neutrons in the nucleus. This sum is referred to as NUCLEONS. A=mass of atom Z=identity of atom Whats an Isotope? - ️️ Correct-Atoms with the same atomic number (Z) but different mass numbers (A). What are the "magic numbers" and whats their significance? - ️️ Correct-The magic numbers are 2, 8, 20, 50, 82 and 126. They represent the protons or neutrons that make up an isotope that mean they are the most nuclear stable. What pattern describes the most unstable vs most stable isotope? - ️️ Correct-In order of increasing stability. 1. An odd number of protons and neutrons means least stable. 2. Protons = odd & neutrons = even (less stable than) protons = even & neutrons = odd TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 4/10 3. An even number of both protons and neutrons means the most stable. What is 1 amu equal to? Is the mass listed on the periodic table in grams or amu? - ️️ Correct-The numbers listed on the periodic table are in amu. 1 amu = 1.6605 x 10⁻²⁴ g. How do you calculate average atomic weight? - ️️ Correct-Average atomic weight is determined through (fraction 1 x element 1) + (fraction 2 x element 2) + (fraction n x element n) = average atomic mass. What is the difference between periods and families on the periodic table? - ️️ Correct- A period is horizontal rows of increasing atomic number. A family is vertical columns of increasing atomic number as well. What are the properties of metals? Nonmentals? Metalloids? - ️️ Correct-A metal is a good conductor of heat and electricity with a tendency to lose electrons. Metals are lustrous malleable and ductile. They also have low ionization energy forming cations. A nonmetal is a poor conductor of heat and electricity with a tendency to gain electrons. Nonmetals vary in color, lack shiny appearances, and brittle. Nonmetals have high electron affinities forming anions. A metalloid is an element with properties of both a metal and a nonmental. TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD OWNER: EMILLYCHARLOTTE COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISHED: SEPTEMBER 2024 5/10 What is potential, kinetic, chemical, and electrostatic energy - ️️ Correct-Potential is energy possessed by an object due to its position. Kinetic is energy possessed by an object due to its motion. Chemical energy is energy stored within the structural units of chemical substances. Electrostatic energy is potential energy that results from the interaction of charged particles. What is one Joule equal to? One newton? - ️️ Correct-1 J = 1 N * m 1 N = 1 kg * m/s² What is the speed of light constant? What is the formula relating speed wavelength and frequency of a wave? - ️️ Correct-c=lamda*V lamda is wavelength, v is frequency and c is speed.