CEM 141 EXAM 1 REVIEW | QUESTIONS AND
ANSWERS | 2025/2026 UPDATE | RATED 100%
CORRECT!!
Constructing a Scientific Explanation Answer - 1. Claim (target of explanation)
2. Evidence (data used to support)
3. Reasoning (connection between claim and evidence)
Scientific Theory Answer - explains how/why; best available explanation of
existing evidence; makes testable predictions; is falsifiable; may change over
time with new evidence
Difference Between Law and Theory Answer - Law: phenomenon; explains
WHAT
Theory: tells WHY
How do we know atoms exist? Answer - We can see them using atomic force
microscopy (AFM) and scanning tunneling microscopy (STM)
Atomic Theory Development Answer - The original idea came from the Greeks;
wasn't a scientific theory but philosophy (Ex. Elements=earth, fire, air, water
and were thought to be in constant motion based on watching the movement
of specks of dust in sunlight and that there was nothing between them AKA
Brownian Motion)
, What distinguishes one element from another? How do atoms of different
elements differ? Answer - Different # of protons and atomic symbol
What types of evidence might be used to conclude tat you had isolated a new
element? Answer - Would have new properties
What types of elements would be difficult to identify? Answer - Ones that
aren't reactive (Ex. Noble gases)
What is the difference between an atom and a molecule? Answer - Molecule:
collection of atoms chemically bonded
What is the difference between an element and a compound? Answer - An
element is one type of atom vs a compound is several different atoms
connected
Atom Answer - is the smallest unit of an element
Dalton's Atomic Theory Answer - 1. Elements are composed of small
indivisible, indestructible particles called atoms (NOT TRUE)
2. All atoms of an element are identical and have the same mass and properties
(NOT TRUE)
3. Atoms of a given element are different from atoms of other elements.
(TRUE)
4. Compounds are formed by combinations of atoms of 2 or more elements
(TRUE)
5. Chemical reactions are due to the rearrangement of atoms, atoms (matter)
are neither created nor destroyed during a reaction (TRUE)
ANSWERS | 2025/2026 UPDATE | RATED 100%
CORRECT!!
Constructing a Scientific Explanation Answer - 1. Claim (target of explanation)
2. Evidence (data used to support)
3. Reasoning (connection between claim and evidence)
Scientific Theory Answer - explains how/why; best available explanation of
existing evidence; makes testable predictions; is falsifiable; may change over
time with new evidence
Difference Between Law and Theory Answer - Law: phenomenon; explains
WHAT
Theory: tells WHY
How do we know atoms exist? Answer - We can see them using atomic force
microscopy (AFM) and scanning tunneling microscopy (STM)
Atomic Theory Development Answer - The original idea came from the Greeks;
wasn't a scientific theory but philosophy (Ex. Elements=earth, fire, air, water
and were thought to be in constant motion based on watching the movement
of specks of dust in sunlight and that there was nothing between them AKA
Brownian Motion)
, What distinguishes one element from another? How do atoms of different
elements differ? Answer - Different # of protons and atomic symbol
What types of evidence might be used to conclude tat you had isolated a new
element? Answer - Would have new properties
What types of elements would be difficult to identify? Answer - Ones that
aren't reactive (Ex. Noble gases)
What is the difference between an atom and a molecule? Answer - Molecule:
collection of atoms chemically bonded
What is the difference between an element and a compound? Answer - An
element is one type of atom vs a compound is several different atoms
connected
Atom Answer - is the smallest unit of an element
Dalton's Atomic Theory Answer - 1. Elements are composed of small
indivisible, indestructible particles called atoms (NOT TRUE)
2. All atoms of an element are identical and have the same mass and properties
(NOT TRUE)
3. Atoms of a given element are different from atoms of other elements.
(TRUE)
4. Compounds are formed by combinations of atoms of 2 or more elements
(TRUE)
5. Chemical reactions are due to the rearrangement of atoms, atoms (matter)
are neither created nor destroyed during a reaction (TRUE)
