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Ninth Grade (Grade 9) Chemistry Questions

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Grade 9 Properties of Matter
Which of the following objects would float, when placed in water?
  1. gold: density=19.3 g/mL
  2. apple: density=0.7 g/mL
  3. rubber: density=1.2 g/mL
  4. iron: density=7.8 g/mL
Grade 9 Bonds and Mixing
In a water molecule, the hydrogen and oxygen atoms are held together by                .
  1. hydrogen bonds
  2. covalent bonds
  3. ionic bonds
  4. water bonds
Grade 9 Bonds and Mixing
Which of these represents the formation of an ionic bond?
  1. The sharing of electrons between two non-metals.
  2. The donation of electrons between two non-metals.
  3. The sharing of electrons between a metal and a non-metal.
  4. The donation of electrons between a metal and a non-metal.
Grade 9 Atomic Structure
What does the nucleus of an atom contain?
  1. protons and neutrons
  2. protons and electrons
  3. protons only
  4. electrons only
Grade 9 Biochemical Pathways
The first set of reactions in cellular respiration is known as
  1. glycolysis.
  2. Krebs cycle.
  3. Calvin cycle.
  4. electron transport chain.
Grade 9 Acids and Bases
Listed below are common household ingredients with their pH value listed. Which one is the strongest base?
  1. Baking Soda, pH=8.8
  2. Vinegar, pH=3.2
  3. Bleach, pH=13.1
  4. Oven Cleaner, pH=11.2
Grade 9 Molecules and Compounds
Which term describes the cohesion of water molecules at the surface of an ocean or another body of water?
  1. Surface tension
  2. water skin
  3. adhesion
  4. solubility
Grade 9 Molecules and Compounds
What is a combination of two or more different substances that are bonded chemically?
  1. mixture
  2. compound
  3. element
  4. chemical
Grade 9 Macromolecules
                has nitrogenous bases.
  1. Protein
  2. DNA
  3. An enzyme
  4. Water
Grade 9 Solvents, Solutes, and Solubility
Which of the following makes up a molecule of water?
  1. one atom of hydrogen and one atom of oxygen
  2. one atom of hydrogen and two atoms of oxygen
  3. two atoms of hydrogen and one atom of oxygen
  4. two atoms of hydrogen and two atoms of oxygen
Grade 9 Acids and Bases
What is produced when an acid reacts with a base?
  1. a base and water
  2. water and ethane
  3. water and salt
  4. water only
Grade 9 Properties of Matter
Which of the following forms of energy is associated with motion?
  1. electrical energy
  2. electromagnetic energy
  3. kinetic energy
  4. potential energy
Grade 9 Macromolecules
The primary structure of a protein is
  1. a chain of amino acids.
  2. a clump of amino acids.
  3. an alpha helix or beta-pleated sheet.
  4. multiple polypeptides bonded together.
Grade 9 Macromolecules
Which macromolecule contains carbon, hydrogen, and oxygen in a 1:2:1 ratio?
  1. carbohydrates
  2. proteins
  3. lipids
  4. nucleic acids
Grade 9 Macromolecules
The speed of reactions can be affected by
  1. enzymes.
  2. temperature.
  3. concentration of reactants.
  4. all of the above.
Grade 9 Atomic Structure
What moves around outside the nucleus and is negatively charged?
  1. A proton
  2. An electron
  3. A neutron
  4. An isotope
Grade 9 Bonds and Mixing
A covalent bond forms when which occurs?
  1. opposite ions attract
  2. protons are shared between atoms
  3. an electron is transferred from one atom to another
  4. two atoms share a pair of electrons
Grade 9 Bonds and Mixing
A compound consisting of two elements is called a(n)                .
  1. binary compound
  2. polyatomic ion
  3. hydrate
  4. hygroscopic
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