Key Terms
_____ is everything that has mass and takes up space
Matter
What is an element?
A substance that cannot be broken down into simpler substances.
Iron rusts?
Chemical change
The letters Fe express the ____ for iron
Symbol
Humans breathe in _____ and release _____
oxygen and cO2
______ is the amount of matter in an object
Mass
Number of protons
Ice melts?
Physical
The periodic table is organized into ____ and _____ (hint your desks are arranged similarly)
Columns and rows
Metals are good ____ meaning they can produce heat and electricity
conductors
______ is the measure of how tightly matter is packed
Density
Which will always be greater, atomic number or mass number? Explain.
Mass number: protons + neutrons
Atomic number: protons
Explain how baking a cake is a physical change.
Usage of the oven
Convection is occurring
Cannot undo the baking
Egg, flour, and milk become inseparable
Rearrangement of atoms occurring
There are _____ elements on the periodic table.
118 elements.
A cookies and cream milkshake is 6 liters big. The 6 liters tell us the ____ of the milkshake
Volume
List the three states of matter.
Solid, Liquid, Gas
The protons and neutrons make up _____% of the mass of an atom
99%
Water is always made of two hydrogen atoms and one oxygen atom. This is called a ____
Proportion
What is the first element on the periodic table and what is its atomic number?
Hydrogen: 1
Over ____ of the human body is comprised of 6 primary elements: phosphorous, oxygen, carbon, nitrogen, _____ and _____-
97% calcium hydrogen
______ has a definite volume but an indefinitely shape
Liquid
Protons and electrons have a(n) ____ and ____ charge
equal and opposite
In a chemical equation, the ____(s) are on the left side and the _____ is on the right side.
Reactants and product
How come the atomic mass can be a decimal? For example, hydrogen's atomic mass is 1.008
It's a weighted average.
Carbon is in most of our food. It is a ____ material and it has ____ protons, ____ electrons, and ____ neutrons
solid: 6, 6, 6