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