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Molecules and Compounds Questions - All Grades

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Grade 6 Molecules and Compounds
Water (H2O) and salt (NaCl) are what?
  1. Elements
  2. Compounds
  3. Mixtures
  4. Solutions
Grade 9 Molecules and Compounds
O2-2 is named                .
  1. oxalate
  2. peroxide
  3. hydroxide
  4. hydronium
Grade 6 Molecules and Compounds
The smallest unit of many compounds is called a(n)                .
  1. molecule
  2. atom
  3. element
  4. DNA
Grade 9 Molecules and Compounds

This question is a part of a group with common instructions. View group »

NO-2 is named                .
  1. nitrite
  2. nitrate
  3. cyanide
  4. ammonium
Grade 10 Molecules and Compounds
What is the correct name for the compound MgO?
  1. magnesium trioxide
  2. dimagnesium trioxide
  3. magnesium oxide
  4. magnesium oxygen
Grade 7 Molecules and Compounds
A molecule of sugar contains carbon and                    .
  1. hydrogen
  2. oxygen
  3. sodium
  4. hydrogen and oxygen
Grade 6 Molecules and Compounds
The small number after an element symbol, like 2 in H2O, is called a(n)                .
  1. square root
  2. subscript
  3. prime number
  4. equation
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 10 Molecules and Compounds
A molecule is the smallest complete unit of a(n)                .
  1. compound
  2. matter
  3. atom
  4. property
Grade 10 Molecules and Compounds
Which is the correct formula for aluminum oxide?
  1. Al2O
  2. AlO3
  3. Al3O2
  4. Al2O3
Grade 10 Molecules and Compounds
The mass of one mole of a substance is called                  .
  1. molecular mass
  2. molar mass
  3. total mass
  4. none of the above
Grade 8 Molecules and Compounds
Which of the following best describes carbon monoxide?
  1. element
  2. compound
  3. homogeneous mixture
  4. heterogeneous mixture
Grade 8 Molecules and Compounds
How is a molecule different from an atom?
  1. A molecule has 2 or more atoms bonded together.
  2. A molecule is a group of the same kind of atoms.
  3. An atom is not at all related to a molecule.
  4. A molecule is smaller than an atom.
Grade 8 Molecules and Compounds
In chemistry, the image shown below is called a/an                     .
Structural Formula - Aldehyde
  1. structural formula
  2. chemical equation
  3. empirical formula
  4. electron-dot diagram
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 6 Molecules and Compounds
Molecules are the tiniest building blocks of matter.
  1. True
  2. False
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
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