Atoms/Periodic Table
pH, Acids and Bases
Pure Substances and Mixtures
Chemical Properties
The Universe
100
Atoms are the smallest unit of what?
Matter
100
A pH of neutral is what number?
7
100
Define homogeneous mixture.
"looks the same"
"evenly mixed"
"no chunks"
100
How can you tell a chemical change has taken place?
Something new is made
(different from the starting material)
100
Name three objects that are part of our solar system.
planets, dwarf planets, meteors, comets, moons
100
Name the three parts to an atom and their charges.
Proton, positive.
Neutron, neutral.
Electron, negative.
100
Acids become stronger closer to number...
0
100
What kind of mixture is this?
Heterogeneous
100
Give an example of a physical change.
(anything when nothing new is made. a phase change, etc.)
100
What keeps everything in a solar system together?
The force of gravity from the star.
(90% of the mass)
200
How many protons are in this element?
16
200
Bases AND acids become WEAKER closer to number...
7
200
What is saturation?
The solvent cannot dissolve any more solute.
200
Name three ways you can increase the speed (rate) of a chemical reaction?
Heat, Smaller container, Catalyst, Break-up chunks
200
What is a solar system?
A star and anything that orbits it.
200
What is the name of the number on top?
Atomic Number
200
Between an acid and a base, which feels slippery to the touch?
Bases
200
Can a pure substance be a compound molecule?
Yes
(salt = NaCl)
200
What does the Law of Conservation of Mass state?
Matter cannot be created or destroyed.
200
What is the name of the group of objects at the very edge of our solar system?
Oort Cloud
300
Why are elements put into families together?
They have similar properties.
(metals are shiny, non-metals are brittle, metalloids in between)
300
When an acid and a base are mixed, what two things are produced?
Water and a salt.
300
What can you do to a mixture that cannot be done to a pure substance?
Separate the parts (the solute and the solvent)
300
How do you create new compounds/substances with individual atoms?
Can only rearrange them.
300
What must an object do to its orbit (path) in order to be considered a planet?
Clear it of debris (smaller objects)