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CHEM 120 EXAM 1: (2025/ 2026 ) INTRODUCTION TO GENERAL, ORGANIC & BIOLOGICAL CHEMISTRY, Exams of Chemistry

CHEM120/ CHEM 120 EXAM 1: (NEW 2025/ 2026 UPDATE) INTRODUCTION TO GENERAL, ORGANIC & BIOLOGICAL CHEMISTRY GUIDE| QS & AS| GRADE A| 100% CORRECT (VERIFIED ANSWERS)

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2024/2025

Available from 05/28/2025

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Chem
Chem120/ Chem
CHEM120/ CHEM 120 EXAM 1: (NEW 2025/ 2026
UPDATE) INTRODUCTION TO GENERAL, ORGANIC &
BIOLOGICAL CHEMISTRY GUIDE| QS & AS| GRADE A|
100% CORRECT (VERIFIED ANSWERS)
Law of Conservation of Mass - ANS Matter is not created nor destroyed in any
chemical or physical change
law of definite proportions - ANS a given compound always contains exactly
the same proportion of elements by mass
Law of Multiple Proportions - ANS if two or more different compounds are
composed of the same two elements, then the ratio of the masses of the second
element combined with a certain mass of the first element is always a ratio of
small whole numbers
Dalton's Atomic Theory - ANS 1) elements are composed of atoms. 2) atoms
of same element are identical, but differ from other elements. 3) elements can
mix together 4) atoms only change when mixed with other elements
Proton - ANS positively charged particle
Neutron - ANS no charge
Electron - ANS negatively charged particle
Nucleus - ANS Centre of an atom
atomic number - ANS number of protons
diatomic molecule - ANS A molecule consisting of two atoms
light - ANS a form of electromagnetic radiation that is visible to the eye
Wavelength - ANS (λ) the distance between two peaks
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Chem

CHEM120/ CHEM 120 EXAM 1: (NEW 2025/ 2026

UPDATE) INTRODUCTION TO GENERAL, ORGANIC &

BIOLOGICAL CHEMISTRY GUIDE| QS & AS| GRADE A|

100% CORRECT (VERIFIED ANSWERS)

Law of Conservation of Mass - ANS ✓Matter is not created nor destroyed in any chemical or physical change law of definite proportions - ANS ✓a given compound always contains exactly the same proportion of elements by mass Law of Multiple Proportions - ANS ✓if two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers Dalton's Atomic Theory - ANS ✓1) elements are composed of atoms. 2) atoms of same element are identical, but differ from other elements. 3) elements can mix together 4) atoms only change when mixed with other elements Proton - ANS ✓positively charged particle Neutron - ANS ✓no charge Electron - ANS ✓negatively charged particle Nucleus - ANS ✓Centre of an atom atomic number - ANS ✓number of protons diatomic molecule - ANS ✓A molecule consisting of two atoms light - ANS ✓a form of electromagnetic radiation that is visible to the eye Wavelength - ANS ✓(λ) the distance between two peaks

Chem peaks - ANS ✓the top/peak of the wavelength Frequency - ANS ✓the number of complete wavelengths that pass a point in a given time speed - ANS ✓2.9979*10^8 m/s (constant) Plank's constant - ANS ✓6.626 x 10^- 34 long wavelength - ANS ✓low frequency, low energy short wavelength - ANS ✓high frequency, high energy photoelectric effect - ANS ✓The emission of electrons from a metal when light shines on the metal dimensional analysis - ANS ✓using units as a guide to solving problems Solid - ANS ✓The particles are tightly packed. The particles do not move around. liquid - ANS ✓particles are close together with no regular arrangement. Particles vibrate, move about, and slide past each other. Gas - ANS ✓Particles are well separated with no regular arrangement. Particles gas vibrate and move freely at high speeds. pure substance - ANS ✓composed of only one type of atom or molecule Mixture - ANS ✓A combination of two or more substances that are not chemically combined Element - ANS ✓A pure substance made of only one kind of atom Compound - ANS ✓A substance made up of atoms of two or more different elements joined by chemical bonds chemical change - ANS ✓A change in matter that produces one or more new substances homogeneous - ANS ✓same composition throughout

Chem He-2 (periodic table) - ANS ✓Helium Li-3 (periodic table) - ANS ✓Lithium Be-4 (periodic table) - ANS ✓Berylium B-5 (periodic table) - ANS ✓Boron C-6 (periodic table) - ANS ✓Carbon N-7 (periodic table) - ANS ✓Nitrogen O-8 (periodic table) - ANS ✓Oxygen F-9 (periodic table) - ANS ✓Fluorine Ne-10 (periodic table) - ANS ✓Neon Na-11 (periodic table) - ANS ✓Sodium Mg-12 (periodic table) - ANS ✓Magnesium Al-13 (periodic table) - ANS ✓Aluminium Si-14 (periodic table) - ANS ✓Silicon P-15 (periodic table) - ANS ✓Phosphorus S-16 (periodic table) - ANS ✓Sulfur Cl-17 (periodic table) - ANS ✓Chlorine Ar-18 (periodic table) - ANS ✓Argon K-19 (periodic table) - ANS ✓Potassium Ca-20 (periodic table) - ANS ✓Calcium Sc-21 (periodic table) - ANS ✓Scandium

Chem Ti-22 (periodic table) - ANS ✓Titanium V-23 (periodic table) - ANS ✓Vanadium Cr-24 (periodic table) - ANS ✓Chromium Mn-25 (periodic table) - ANS ✓Manganese Fe-26 (periodic table) - ANS ✓Iron Co-27 (periodic table) - ANS ✓Cobalt Ni-28 (periodic table) - ANS ✓Nickel Cu-29 (periodic table) - ANS ✓Copper Zn-30 (periodic table) - ANS ✓Zinc Br-35 (periodic table) - ANS ✓Bromine Ag-47 (periodic table) - ANS ✓Silver I-53 (periodic table) - ANS ✓Iodine Pt-78 (periodic table) - ANS ✓Platinum Au-79 (periodic table) - ANS ✓Gold Hg-80 (periodic table) - ANS ✓Mercury Pb-82 (periodic table) - ANS ✓Lead Matter - ANS ✓Anything that has mass and takes up space