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Ninth Grade (Grade 9) Chemistry Questions

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Grade 9 Macromolecules
What type of organic compound is the main source of energy in living things?
  1. proteins
  2. carbohydrates
  3. lipids
Grade 9 Reactions
Chemical reaction in which two or more atoms or molecules combine to form larger molecules is called a                       .
  1. decomposition reaction
  2. synthesis reaction
  3. displacement reaction
  4. catabolic reaction
Grade 9 Acids and Bases
What is the pH of pure water?
  1. pH=0
  2. pH=14
  3. pH=7
  4. pH=5
Grade 9 Solvents, Solutes, and Solubility
The substance that is dissolved in a solution is a                .
  1. solvent
  2. solute
  3. concentrate
  4. solution
Grade 9 Atomic Structure
How many protons are in an atom of phosphorus?
  1. 16
  2. 30.973
  3. 15
  4. 8
Grade 9 Macromolecules
Enzymes are catalysts that are made up of
  1. lipids.
  2. substrates.
  3. proteins.
  4. carbohydrates.
Grade 9 Periodic Table and Elements
What is represented in the rows of the periodic table?
  1. isotopes
  2. atoms
  3. families
  4. periods
Grade 9 Bonds and Mixing
Gasoline and oil are covalent compounds that are                 water.
  1. heavier than
  2. insoluble in
  3. miscible with
  4. soluble in
Grade 9 Molecules and Compounds
A chemical combination of two or more elements is called a(n)                .
  1. element
  2. isotope
  3. molecule
  4. compound
Grade 9 Macromolecules
What is the chemical reaction that links monomers together to form polymers, releasing water in the process?
  1. hydrolysis
  2. decomposition
  3. exergonic reaction
  4. dehydration synthesis
Grade 9 Macromolecules
The monomers of nucleic acids are
  1. nucleotides.
  2. amino acids.
  3. nitrogen bases.
  4. sugar and phosphate.
Grade 9 Solvents, Solutes, and Solubility
Water is a                 molecule.
  1. polar
  2. nonpolar
  3. covalent
  4. ionic
Grade 9 Atomic Structure
Neutrons have this charge.
  1. positive
  2. neutral
  3. negative
Grade 9 Biochemical Pathways
What is needed for photosynthesis?
  1. Carbon dioxide, light, water, sugar, and carbohydrates
  2. Sunlight, water, carbon dioxide, and chlorophyll
Grade 9 Biochemical Pathways
The primary factor that affects the rate of photosynthesis is
  1. carbon dioxide.
  2. sunlight.
  3. temperature.
  4. water.
Grade 9 Properties of Matter
What can be said about the molecules represented in the diagram?
Particle State - Gas
  1. The molecules move very slowly.
  2. The molecules are very close together.
  3. The molecules have a natural resistance to flowing.
  4. The molecules have a very high energy state.
Grade 9 Biochemical Pathways
Which type of cellular respiration includes the Krebs cycle as one of its processes?
  1. anerobic respiration
  2. Krebs respiration
  3. photosynthesis
  4. aerobic respiration
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