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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 Macromolecules
Amino acids are the building blocks for                .
  1. carbohydrates
  2. DNA and RNA
  3. lipids
  4. proteins
Grade 9 Periodic Table and Elements
Horizontal rows on the periodic table are called                .
  1. Catoids
  2. genome
  3. groups
  4. periods
  5. families
Grade 9 Periodic Table and Elements
These are pure substances that cannot be broken down into other substances by physical and chemical means.
  1. Elements
  2. Atoms
  3. Compounds
  4. Isotopes
  5. Protons
Grade 9 Reactions
The process by which chemical bonds are broken and formed is called a                        .
  1. chemical reaction
  2. decomposition
  3. displacement
  4. stoichiometric reaction
Grade 9 Molecules and Compounds
Which of the following is NOT a compound?
  1. NaCl
  2. Cacl
  3. C
  4. KCl
  5. NaOH
Grade 9 Periodic Table and Elements
What is the element symbol for oxygen?
  1. Al
  2. O
  3. Pb
  4. Sn
Grade 9 Atomic Structure
The region around the nucleus occupied by the electrons is called the                .
  1. negative zone
  2. electric cloud
  3. electron cloud
  4. neutron cloud
Grade 9 Periodic Table and Elements
What is the element symbol for iron?
  1. I
  2. Fe
  3. Au
  4. Na
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 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 Periodic Table and Elements
What is the symbol for the element sulfur?
  1. S
  2. Sr
  3. Su
  4. Sl
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
What is a combination of sand and salt that can be separated rather easily called?
  1. a substance
  2. a mass
  3. a mixture
  4. a property
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