Matter
Elements
Counting Particles
Molecules & Compounds
Physical & Chemical Changes
100
This term describes anything that has mass and takes up space.
What is matter?
100
A pure substance made of only one kind of atom is called this.
What is an element?
100
The atomic number of an element tells you the number of these particles.
What are protons?
100
Two or more atoms bonded together form one of these.
What is a molecule?
100
Crumbling paper, melting ice cream, and cutting wood are examples of this type of change.
What is a physical change?
200
Light, heat, and sound are not matter because they are forms of this.
What is energy?
200
Elements are arranged on the periodic table based on this number.
What is the atomic number (number of protons)?
200
In a stable atom, the number of protons equals the number of these negatively charged particles.
What are electrons?
200
A substance made of two or more different elements is called this.
What is a compound?
200
A substance becoming a new substance with new properties is this type of change.
What is a chemical change?
300
All matter is made of these tiny building blocks.
What are atoms?
300
Chemical symbols always start with this kind of letter.
What is a capital letter?
300
You subtract the atomic number from the atomic mass to find the number of these particles.
What are neutrons?
300
H₂O, CO₂, and C₆H₁₂O₆ are examples of these written representations.
What are chemical formulas?
300
Bubbling, a temperature change, or a color change are signs that this has occurred.
What is a chemical change?
400
This particles are found in the nucleus.
What are protons and neutrons?
400
This number tells scientists the total number of protons and neutrons in an atom.
What is the atomic mass?
400
How many protons does an atom of Aluminum have?
What is 13?
400
This common compound has one carbon atom and two oxygen atoms.
What is carbon dioxide (CO₂)?
400
In a chemical equation, the substances you start with are called these.
What are reactants?
500
These are the particles in an atom with the smallest mass.
What are electrons?
500
These two letters are the only ones not used in any chemical element symbol on the periodic table.
What are Q and J?
500
If an atom has 6 protons and an atomic mass of 14, it has this many neutrons.
What is 8?
500
Sugar’s formula, C₆H₁₂O₆, means it has this many hydrogen atoms.
What is 12?
500
This scientific law states that atoms are not created or destroyed in a chemical reaction.
What is the law of conservation of mass?