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Ninth Grade (Grade 9) Chemistry Questions

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Grade 9 Periodic Table and Elements
An element is a substance that                                              .
  1. exists naturally as a solid, liquid, and gas
  2. cannot be broken down into simpler substances
  3. is above 86 on the periodic table
  4. can be broken down only by chemical means
Grade 9 Properties of Matter
A chemical change refers to                                                                               .
  1. a change in matter when matter independent changes form.
  2. a change in matter that does not change composition.
  3. a change in matter that leads to melting or evaporation.
  4. a change in matter that occurs when substances combine to form new substances.
Grade 9 Periodic Table and Elements
Vertical columns are called                .
  1. periods
  2. metals
  3. metalloids
  4. groups
  5. non-metals
Grade 9 Periodic Table and Elements
Grade 9 Periodic Table and Elements
Grade 9 Reactions
Grade 9 Periodic Table and Elements
Grade 9 Atomic Structure
Grade 9 Atomic Structure
Why does an atom have no net electric charge?
  1. Its subatomic particles carry no electrical charge.
  2. The positively charged protons cancel out the negatively charged neutrons.
  3. The positively charged neutrons cancel out the negatively charged electrons.
  4. The positively charged protons cancel out the negatively charged electrons.
Grade 9 Periodic Table and Elements
Grade 9 Atomic Structure
What are the three particles that make up an atom?
  1. protons, neutrons, and isotopes
  2. neutrons, isotopes, and electrons
  3. positives, negatives, and electrons
  4. protons, neutrons, and electrons
Grade 9 Atomic Structure
                is equal to the number of protons and the number of neutrons.
  1. Atomic number
  2. Ionic number
  3. Covalent number
  4. Atomic Mass
  5. Atoms
Grade 9 Atomic Structure
Grade 9 Acids and Bases
Dilute and concentrated refer to                                        .
  1. the concentration of a solution
  2. how much water is added to the solution
  3. how high the boiling point is
  4. none of the above
Grade 9 Bonds and Mixing
Grade 9 Periodic Table and Elements
Grade 9 Atomic Structure
Atoms become positively charged when it                 .
  1. shares electrons
  2. loses electrons
  3. loses protons
  4. gains electrons
  5. gains protons
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