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Atoms
Periodic Table
Acids/Bases
Chemical Reaction
100
Protons are have a _________-charge.
Positive
100
What is the symbol for Hydrogen?
H
100
Lemon juice is an acid or a base?
acid
100
Chemical reaction is a chemical change or a physical change?
Chemical change
200
Inside the nucleus are __________ and ___________.
Protons and Neutrons
200
The periodic table has how many elements total?
118
200
What pH is neutral?
7
200
Name at least 2 signs that show a chemical reaction is happening.
Gas production (bubbling) Heating Cooling Color change Forming precipitate (making a solid)
300
The atomic mass is _____________________________.
the number of protons in an atom
300
The periodic table numbers elements in the order of the number of their _____________.
Protons
300
How can you tell the difference between an acid and a base using litmus paper?
In an acid, litmus paper turns red. It turns blue in a base.
300
The left side of the chemical reaction is called ____________. The right side is called ______________.
Reactants, Products
400
If an atom has 3 protons, 3 neutrons, and 3 electrons, the weight of the atom is ______________ atomic mass units.
6 (because you add the protons and neutrons; electrons don't weigh anything!)
400
A column in a periodic table is called ___________. A row is called the ____________.
Group, Period
400
What do acids and bases do with hydrogen atoms?
Acids donate hydrogen atoms; bases accept hydrogen atoms.
400
Explain the difference between a chemical change and a physical change.
In a physical change, something changes in size or appearance but it is still the same substance. In a chemical change, the substance changes to a totally different substance.
500
What is the main difference between different elements in their atoms? (For example, what is different between a carbon atom and an oxygen atom?)
the number of protons (carbon has 6 protons and oxygen has 8 protons)
500
When you move down or move right on the periodic table, what increases?
the number of protons and thus the weight of the atoms
500
What happens when you mix an acid and a base?
The pH becomes closer to neutral. (Neutralization)
500
Explain what the Law of Conservation of Matter says.
It says that all the atoms that are at the start of the reaction are at the end of the reaction. Atoms cannot magically appear or disappear; they can only be rearranged like lego pieces.