CEM 141 EXAM 1 REVIEW EXAM WITH
CORRECT QUESTIONS AND ANSWERS
2025
Constructing a Scientific Explanation - CORRECT-ANSWERS1. Claim (target of explanation)
2. Evidence (data used to support)
3. Reasoning (connection between claim and evidence)
Scientific Theory - CORRECT-ANSWERSexplains 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 - CORRECT-ANSWERSLaw: phenomenon; explains WHAT
Theory: tells WHY
How do we know atoms exist? - CORRECT-ANSWERSWe can see them using atomic force
microscopy (AFM) and scanning tunneling microscopy (STM)
, Atomic Theory Development - CORRECT-ANSWERSThe 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? -
CORRECT-ANSWERSDifferent # of protons and atomic symbol
What types of evidence might be used to conclude tat you had isolated a new element? -
CORRECT-ANSWERSWould have new properties
What types of elements would be difficult to identify? - CORRECT-ANSWERSOnes that aren't
reactive (Ex. Noble gases)
What is the difference between an atom and a molecule? - CORRECT-ANSWERSMolecule:
collection of atoms chemically bonded
CORRECT QUESTIONS AND ANSWERS
2025
Constructing a Scientific Explanation - CORRECT-ANSWERS1. Claim (target of explanation)
2. Evidence (data used to support)
3. Reasoning (connection between claim and evidence)
Scientific Theory - CORRECT-ANSWERSexplains 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 - CORRECT-ANSWERSLaw: phenomenon; explains WHAT
Theory: tells WHY
How do we know atoms exist? - CORRECT-ANSWERSWe can see them using atomic force
microscopy (AFM) and scanning tunneling microscopy (STM)
, Atomic Theory Development - CORRECT-ANSWERSThe 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? -
CORRECT-ANSWERSDifferent # of protons and atomic symbol
What types of evidence might be used to conclude tat you had isolated a new element? -
CORRECT-ANSWERSWould have new properties
What types of elements would be difficult to identify? - CORRECT-ANSWERSOnes that aren't
reactive (Ex. Noble gases)
What is the difference between an atom and a molecule? - CORRECT-ANSWERSMolecule:
collection of atoms chemically bonded
