CHEM 103 EXAM 1
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ [LATEST 2026-
2027] 100% GUARANTEED
PASS
Atomos - CORRECT ANSWER-Greek for "Indivisible". Where the word Atom was derived from.
Law of Conservation of Mass - CORRECT ANSWER-In chemical reactions, matter is neither
created or destroyed. (The amount you start with is the amount you end with).
Example of the Law of Conservation of Mass:
If 16.0 g of Methane react with 64.0 g of Oxygen, 36.0 g of Water are produced. How many g of
Carbon Dioxide are produced in this reaction? - CORRECT ANSWER-44.0 g.
(Methane) 16.0 g + (Oxygen) 64.0 g -> (Carbon Dioxide) 44.0 g + (Water) 36.0 g.
Modern Atomic Theory - CORRECT ANSWER-- Elements are made of tiny, indivisible particles
called atoms.
- The atoms of each element are unique.
- Atoms can join together in whole-number ratios to form compounds.
- Atoms are unchanged in chemical reactions (how or what they're connected to changes).
3 Fundamental Ideas of Atoms - CORRECT ANSWER-- All mater is composed of atoms.
, - The atoms of each element have unique characteristics and properties.
- Atoms are not changed in a chemical reaction -> they combine in whole number ratios to form
compounds.
Can we see Atoms? - CORRECT ANSWER-No, atoms are too small to see with the naked eye.
How were scientists able to visualize atoms in the 1990's? - CORRECT ANSWER-On a metal
surface using scanning tunneling microscopy. They were even able to manipulate atoms to
create the letters "IBM" from individual atoms.
How did Russian scientist, Dmitri Mendeleev, organize known elements into a table in the
1860's? - CORRECT ANSWER-Based on their Atomic Masses. He also arranged elements with
similar properties, such as fluorine, chlorine, bromine, and iodine, into columns/groups. Doing
this, he was able to predict the existence of several elements, such as germanium and gallium,
which had not yet been discovered.
Atom - CORRECT ANSWER-The fundamental unit of matter.
Element - CORRECT ANSWER-A pure substance made of only one kind of atom. Each element is
composed of a different type of atom, which gives each element its unique properties.
Compound - CORRECT ANSWER-A substance made up of atoms of two or more different
elements joined by chemical bonds.
How are Elements of the Periodic Table organized? - CORRECT ANSWER-Based on their masses
and properties. (Technically atomic number too).
Groups (Periodic Table) - CORRECT ANSWER-Vertical columns (1A-8A).
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ [LATEST 2026-
2027] 100% GUARANTEED
PASS
Atomos - CORRECT ANSWER-Greek for "Indivisible". Where the word Atom was derived from.
Law of Conservation of Mass - CORRECT ANSWER-In chemical reactions, matter is neither
created or destroyed. (The amount you start with is the amount you end with).
Example of the Law of Conservation of Mass:
If 16.0 g of Methane react with 64.0 g of Oxygen, 36.0 g of Water are produced. How many g of
Carbon Dioxide are produced in this reaction? - CORRECT ANSWER-44.0 g.
(Methane) 16.0 g + (Oxygen) 64.0 g -> (Carbon Dioxide) 44.0 g + (Water) 36.0 g.
Modern Atomic Theory - CORRECT ANSWER-- Elements are made of tiny, indivisible particles
called atoms.
- The atoms of each element are unique.
- Atoms can join together in whole-number ratios to form compounds.
- Atoms are unchanged in chemical reactions (how or what they're connected to changes).
3 Fundamental Ideas of Atoms - CORRECT ANSWER-- All mater is composed of atoms.
, - The atoms of each element have unique characteristics and properties.
- Atoms are not changed in a chemical reaction -> they combine in whole number ratios to form
compounds.
Can we see Atoms? - CORRECT ANSWER-No, atoms are too small to see with the naked eye.
How were scientists able to visualize atoms in the 1990's? - CORRECT ANSWER-On a metal
surface using scanning tunneling microscopy. They were even able to manipulate atoms to
create the letters "IBM" from individual atoms.
How did Russian scientist, Dmitri Mendeleev, organize known elements into a table in the
1860's? - CORRECT ANSWER-Based on their Atomic Masses. He also arranged elements with
similar properties, such as fluorine, chlorine, bromine, and iodine, into columns/groups. Doing
this, he was able to predict the existence of several elements, such as germanium and gallium,
which had not yet been discovered.
Atom - CORRECT ANSWER-The fundamental unit of matter.
Element - CORRECT ANSWER-A pure substance made of only one kind of atom. Each element is
composed of a different type of atom, which gives each element its unique properties.
Compound - CORRECT ANSWER-A substance made up of atoms of two or more different
elements joined by chemical bonds.
How are Elements of the Periodic Table organized? - CORRECT ANSWER-Based on their masses
and properties. (Technically atomic number too).
Groups (Periodic Table) - CORRECT ANSWER-Vertical columns (1A-8A).
