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Ninth Grade (Grade 9) Molecules and Compounds Questions

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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 Molecules and Compounds
[math]O_2^(2-[/math] is named                .
  1. oxalate
  2. peroxide
  3. hydroxide
  4. hydronium
Grade 9 Molecules and Compounds

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[math]NO_2^-[/math] is named                .
  1. nitrite
  2. nitrate
  3. cyanide
  4. ammonium
Grade 9 Molecules and Compounds
Pure substances are made up of one or more elements chemically combined.
  1. Compounds
  2. Elements
  3. Electrons
  4. Solutions
  5. Mixtures
Grade 9 Molecules and Compounds
Water is a polar molecule because                                                    .
  1. it contains two hydrogen atoms for each oxygen atom
  2. both ends carry a positive charge
  3. each end of the molecule has a different charge
  4. both ends carry a negative charge
Grade 9 Molecules and Compounds
A compound contains two or more
  1. elements physically combined.
  2. simple substances.
  3. elements chemically combined.
  4. nuclei combined with electrons.
Grade 9 Molecules and Compounds
When elements are more stable in a combined form, which of the following forms?
  1. atoms
  2. metals
  3. nuclei
  4. compounds
Grade 9 Molecules and Compounds
Cations and anions are examples of what type of elemental compound?
  1. Ionic compounds that are either negative or positive
  2. Plyatomic atoms
  3. Diatomic atoms
  4. None of the above
Grade 9 Molecules and Compounds
How should you write the chemical formula in the given polyatomic ion?
  1. Mg(NO2)2
  2. Mg2NO2
  3. MgNO2
  4. None of the above.
Grade 9 Molecules and Compounds
What is a characteristic of a polar covalent bond?
  1. have equal attraction for electrons.
  2. have unequal attraction for electrons.
  3. Are positively charged.
  4. None of the above.
Grade 9 Molecules and Compounds
What is the octet rule?
  1. Where atoms have neutral charges.
  2. Are binary compounds.
  3. Where atoms form single bonds.
  4. Where atoms form compounds with 8 valence electrons.
Grade 9 Molecules and Compounds
The purpose of a Lewis structure is to                                                     .
  1. model a covalent molecule with its valence electrons
  2. to show each elements nucleus
  3. to diagram ions and protons
  4. None of the above
Grade 9 Molecules and Compounds
By definition, an anion is                   .
  1. negatively charged
  2. neutral
  3. positively charged
  4. None of the above.
Grade 9 Molecules and Compounds
[math]S_2O_3^(2-[/math] is named                 .
  1. sulfite
  2. sulfate
  3. thiosulfate
  4. hydrogen sulfate
Grade 9 Molecules and Compounds
What type of substance cannot be separated by physical means, but rather by chemical means?
  1. mixture
  2. compound
  3. solution
  4. element
Grade 9 Molecules and Compounds
By definition, a cation is                   .
  1. a neutral atom
  2. positively charged
  3. negatively charged
  4. none of the above
Grade 9 Molecules and Compounds
Which of the following is neutrally charged?
  1. an ion
  2. a compound
  3. an electron
  4. a proton
Grade 9 Molecules and Compounds
Molecules and atoms tend to always move around.
  1. True
  2. False
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