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Tenth Grade (Grade 10) Chemistry Questions

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Grade 10 Reactions
What is a reaction in which two or more substances react to form a single substance?
  1. single reaction
  2. synthesis reaction
  3. combustion
  4. none of the above
Grade 10 Molecules and Compounds

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The sum of the charges in an ionic compound must equal                .
  1. positive eight
  2. zero
  3. negative eight
  4. positive one
Grade 10 Reactions
Generally, an increase in temperature                              .
  1. increases reaction rate
  2. decreases reaction rate
  3. acts as a catalyst
  4. does not affect reaction rate
Grade 10 Macromolecules
An enzyme speeds up a reaction by
  1. absorbing energy.
  2. lowering the activation energy.
  3. raising the activation energy.
  4. releasing energy.
Grade 10 Atomic Structure
Which of the following atoms has the fewest electrons?
  1. 12753I
  2. 12852Te
  3. 12351Sb
  4. 12150Sn
Grade 10 Macromolecules
Nucleic acids are made of
  1. sugars.
  2. fatty acids.
  3. nucleotides.
  4. amino acids.
Grade 10 Stoichiometry
The mole is based on
  1. speed of light.
  2. Planck's constant.
  3. pi.
  4. Avogadro's number.
Grade 10 Periodic Table and Elements
Noble gases are unreactive because they have a full shell of                      .
  1. inner-level electrons
  2. protons
  3. valence electrons
  4. neutrons
Grade 10 Atomic Structure
An atom consists of what key, primary components?
  1. ions, protons, electrons
  2. protons, electrons, molecules
  3. protons, electrons, neutrons
  4. elements, neutron protons
Grade 10 Atomic Structure
How many neutrons are present in the atom shown below?
  1. 21
  2. 24
  3. 45
  4. 66
Grade 10 Reactions
What type of reaction always releases energy?
  1. endothermic
  2. exothermic
  3. decomposition
  4. oxidation-reduction
Grade 10 Periodic Table and Elements
Which of the following will decrease as you move left to right across a period of the Periodic Table?
  1. electron affinity
  2. atomic radius
  3. electronegativity
  4. atomic number
Grade 10 Biochemical Pathways
What are the products of photosynthesis?
  1. oxygen and carbon dioxide
  2. oxygen and glucose
  3. glucose and carbon dioxide
  4. glucose and water
Grade 10 Macromolecules
This type of lipid is responsible for sending signals between cells.
  1. oil
  2. enzyme
  3. hormone
  4. starch
Grade 10 Bonds and Mixing
A polar covalent bond is likely to form between two atoms that
  1. are similar in electronegativity.
  2. are of similar size.
  3. differ in electronegativity.
  4. have the same number of electrons.
Grade 10 Atomic Structure
Which of the following pairs shows isotopes of the same element?
  1. 126Cand126C
  2. 146Cand147N
  3. 146Cand126C
  4. 146Cand146C-4
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