Atoms
Pure Substances
Mixtures
Chemical Formula
Chemical Equations
States of Matter
100
What are atoms made of?
Protons, Neutrons and Electrons
100
What are the two types of pure substances?
Elements and Compounds
100
Which of these is a mixture of compounds?
C
100
What do the letters represent in chemical formulas? (Example: The H and O in H2O)
Elements
100
What do we call the things on the left side of an equation?
Reactants
100
What causes a substance to change states of matter?
adding or taking away thermal energy
200
What are the charges of these particles?
electrons = negative
protons = positive
neutrons = neutral
200
These can be found on the periodic table and are a substance that cannot be broken down into any other substance.
Elements
200
A & B
200
What do subscripts represent in chemical formulas? (Example: the 2 in H2O)
The number of atoms.
200
What do we call the things on the right side of an equation?
Products
200
Which state of matter has the least energy
solid
300
Where are neutrons located in the atom?
In the nucleus
300
Which of these is a pure substance?
Figure 1
300
Give me an example of a mixture.
Various
300
What do the coefficients represent in a chemical formula? (Example: the 3 in 3H2O)
The number of molecules.
300
Is this equation balanced or unbalanced?
H2 + N2 --> NH3
Unbalanced
300
Which state of matter is found between the boiling point and the melting point of a substance?
liquid
400
How do we get the atomic mass?
The number of protons + the number of neutrons
400
This is a pure substance that is a combination of two or more elements bonded together.
Compound
400
True or False:
Substances in a mixture are combined physically not chemically.
True
400
How many Oxygen atoms are in this formula?
3H2O?
3
400
Is the following equation balanced or unbalanced?
C + 2H2 --> CH4
Balanced
400
What state of matter is point S?
liquid
500
What determines the identity of an element?
The number of protons in the atom (atomic number)
500
Which of these are pure substances?
A & B
500
What are the two types of mixtures?
Homogenous and Heterogenous
500
How many iron atoms are in this formula?
2Fe2O3
4
500
Balance the following equation:
Na3PO4 + KOH --> NaOH + K3PO4
Na3PO4 + 3KOH --> 3NaOH + K3PO4
500
What state of matter is point R?
Gas