Semester Exam Review

What 2 subatomic particles are similar in mass?

• electrons and protons

• neutrons and electrons

• Protons and neutron

• molecules

What is the atomic mass of this atom?

• 1

• 3

• 4

• 7

What is the atomic number of this atom?

• 4
• 5
• 9
• none of the above

What type of matter is shown?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

How many neutrons are in Phosphorus?

• 16

• 15

• 31

• 46

Identify this type of reaction: 
Al (s) + HCl (aq) → AlCl₃ (aq) + H₂ (g)

• Precipitation
• Synthesis
• Combustion
• Single Replacement

The Law of Conservation of Mass states that the total mass of the reactants should be

• More than the mass of the products

• Equal to the mass of the products

• Ignored during the reaction

• Less than the mass of the products

Which of the following reactions involves the ions of two compounds exchanging places to form two new compounds?

• Synthesis

• Double Replacement

• Combustion

• Single Replacement

The formation of water is an example of a ________ reaction because two simple substances (H and O) combine to produce a new compound (H₂O).

• Single Displacement
• Decomposition
• Double Replacement
• Synthesis

The equation 2 H₂O₂ --> 2 H₂O + O₂ is an example of which type of reaction?

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement