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Chemistry + chemistry 1C + chemistry 1.2 + Configuration
  • 1. What is the first step of the scientific method?
A) Draw a conclusion.
B) Form a hypothesis.
C) Make an observation
D) Do an experiment.
  • 2. What is a hypothesis in the scientific method?
A) A provisional explanation that can be tested.
B) A collection of data.
C) An assumption without basis.
D) A proven conclusion.
  • 3. Which step of the scientific method involves testing the hypothesis?
A) Conclusion.
B) Observation.
C) Experimentation.
D) Communication of results.
  • 4. What happens if the results of an experiment do not support the hypothesis?
A) The data are considered invalid.
B) The hypothesis is modified or a new one is proposed.
C) One moves directly to the conclusion.
D) The scientific method is discarded.
  • 5. Which step of the scientific method allows other scientists to repeat the work carried out?
A) Observation.
B) Conclusion.
C) Experimentation.
D) Communication of results.
  • 6. What is the difference between a hypothesis and a prediction?
A) The prediction is what we’d expect to see if the hypothesis is correct.
B) The hypothesis is the result of the experiment.
C) They are the same.
D) The prediction comes before the hypothesis.
  • 7. In the periodic table, which value represents the number of protons in the nucleus of an atom?
A) The valence.
B) The number of neutrons
C) The atomic mass.
D) The atomic number.
  • 8. What do elements in the same group (column) of the periodic table have in common?
A) The same atomic mass.
B) The same reactivity.
C) The same number of valence electrons.
D) The same number of energy levels.
  • 9. Elements in the same period (row) of the periodic table have in common:
A) The same number of valence electrons.
B) The same number of protons.
C) The same number of energy levels.
D) Similar chemical properties.
  • 10. What is the name of the Group 18 family known for being very stable and unreactive?
A) Noble gases.
B) Transition metals.
C) Alkali metals.
D) Halogens.
  • 11. What is mainly used to classify a bond as nonpolar covalent, polar covalent, or ionic?
A) The number of protons in the atom.
B) The difference in electronegativity between atoms
C) The atomic mass of the elements.
D) The number of neutrons in the nucleus.
  • 12. What is the key difference in electron behavior between an ionic bond and a covalent bond?
A) In ionic bonds, electrons are transferred; in covalent bonds, they are shared.
B) In ionic bonds, electrons are unequally attracted; in covalent bonds, equally attracted.
C) In both, electrons are equally shared.
D) In ionic bonds, electrons are shared; in covalent bonds, they are transferred.
  • 13. If two oxygen atoms bond to form O₂ and share electrons equally, what type of bond is this?
A) Polar covalent.
B) Metallic.
C) Nonpolar covalent.
D) Ionic.
  • 14. When sodium (Na) transfers one electron to chlorine (Cl) to form NaCl, what type of bond is formed?
A) Ionic
B) Polar covalent.
C) Metallic.
D) Nonpolar covalent.
  • 15. In a water molecule (H₂O), oxygen attracts shared electrons more strongly than hydrogen. What type of bond is this?
A) Ionic.
B) Nonpolar covalent.
C) Metallic.
D) Polar covalent.
  • 16. Which type of bond usually forms solid crystalline structures and has very high melting points?
A) Polar covalent.
B) None of the above.
C) Nonpolar covalent.
D) Ionic
  • 17. What does pH measure?
A) The temperature of a liquid.
B) The acidity or alkalinity of a solution.
C) The amount of water in a substance.
D) The mass of an atom.
  • 18. What is the pH value of pure water?
A) 10
B) 14
C) 7
D) 0
  • 19. A solution with pH = 2 is…
A) None of the above
B) Acidic
C) Neutral
D) Basic
  • 20. A solution with pH: 12 is considered…
A) Neutral
B) Alkaline
C) Acidic
D) Radioactive
  • 21. Which of the following substances is acidic?
A) Lemon juice
B) Soap
C) Pure water
D) Baking soda
__22. Baking sodaA. 0
__23. Drain cleanerB. 3
__24. HClC. 6
__25. MilkD. 7
__26. VinegarE. 9
__27. WaterF. 14
__28. >1.7A. Nonpolar covalent
__29. <0.4B. Polar covalent
__30. 0.5- 1.7C. Ionic.
Write the electron configuration of the following elements:a) Phosphorus Z = 15b) Manganese, Z = 25c) Chlorine, Z = 17
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