Homework Week 12: Chemistry

The compounds or elements present at the end of a reaction 

• reactants
• catalyst
• products
• energy 

The compounds and elements that are present at the beginning of a reaction:

• reactants
• catalyst
• products
• energy 

An electron is

• positively charged

• neutral

• negatively charged

atomic number is

• the number of protons

• the number of electrons

• the number of neutrons

• the location of an atom on the periodic table

Atomic Mass is the number of

• protons and neutrons in the nucleus of an atom

• protons and electrons in the nucleus of an atom

• neutrons and electrons in the nucleus of an atom

What are the 3 particles that make-up the atom?

• protons, neutrons, and isotopes
• neutrons, isotopes, and electrons
• positives, negatives, and electrons
• protons, neutrons, and electrons

How many neutron are in the atom "K"?

• 7

• 2

• 39

• 20

If I gain electrons I become

• Positive because I've added to my atom
• negative because I've added electrons
• same because i'm balanced
• equal because now I have electrons

The proper formula for magnesium hydroxide:

• MgOH

• Mg₂OH

• Mg(OH)₂

• Mg₂OH₂

How do the following two elements bond together?

Al³⁺ O^2-

• AlO

• Al₂O₃

• Al₃O₆

• Al₃O₂