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Ninth Grade (Grade 9) Chemistry Questions

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Grade 9 Acids and Bases
A substance with a pH of 0 is a                .
  1. neutral
  2. strong acid
  3. strong base
  4. metal
  5. non-metal
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 Periodic Table and Elements
What is the symbol for the element helium?
  1. Hm
  2. Hl
  3. He
  4. H
Grade 9 Macromolecules
The reactants in an enzyme-catalyzed reaction are called the
  1. active sites.
  2. elements.
  3. inhibitors.
  4. substrates.
Grade 9 Periodic Table and Elements
Which term refers to the number of protons in an atom and helps to place elements on the Periodic Table?
  1. atomic number
  2. atomic mass
  3. mass number
  4. isotope
Grade 9 Biochemical Pathways
Which statement describes cellular respiration?
  1. the process of decomposing chemical energy stored in bonds into energy that can be used by the cell
  2. the process of creating food for the cell
  3. the process of combining oxygen and water to produce another substance to be transported
  4. the process of making proteins
Grade 9 Macromolecules
How do enzymes help chemical reactions to occur?
  1. They speed up reactions by adding more substrates to react with enzymes.
  2. They slow down reactions by increasing the activation energy.
  3. They speed up chemical reactions by lowering the activation energy required.
  4. They slow down reactions by changing the overall temperature of the reaction.
Grade 9 Biochemical Pathways
Which process is NOT a stage of cell respiration?
  1. Calvin cycle
  2. Krebs cycle
  3. glycolysis
  4. electron transport chain
Grade 9 Atomic Structure
Which subatomic particle has a positive charge?
  1. proton
  2. neutron
  3. electron
  4. nucleus
Grade 9 Macromolecules
Glucose and fructose are examples of
  1. double sugars.
  2. disaccharides.
  3. single sugars.
  4. polysaccharides.
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 Acids and Bases
These are weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH.
  1. Hydrogen ions
  2. Buffers
  3. Solution
  4. Hydroxide ions
  5. Atoms
Grade 9 Acids and Bases
A substance with a pH of 1.5 is classified as a/an                  .
  1. acid
  2. base
  3. neutral
  4. salt
  5. none of the above
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