sic
26. Dominic wants to experiment with sugar cubes. Which of the following causes
sugar cube to only change physically?
A. Buming the sugar cube with a match.
B. Chewing the sugar cube and digesting it.
C. Dehydrating the sugar cube with sulfuric acid.
D. Crushing the sugar cube and dissolving it in water.
27. Which of the following is considered as the smallest, basic unit of matter?
A. atom
B. element C. particle
D. molecule
28. Which is a particle consisting of two or more atoms combined together in a
specific arrangement?
A. atom
B. molecule
C element
D. subatomic
29. Which describes the diagram below?
e
posive
charge
+
Electron
A. Solid sphere model of John Dalton
B. Plum pudding model of Joseph John Thomson
C. Atomic Model of Neils Bohr and Arnold Sommerfeld
D. Alpha scattering experiment of Ernest Rutherford group
30. What is Rutherford alpha particle scattering experiments
A. He introduced the concept of elliptical orbits.
B. He used cathode ray tubes which showed that all atoms contain tiny
negatively charged subatomic particles or electrons.
C. He showed that the electrons in atoms are in orbits of differing energy
around the nucleus (think of planets orbiting around the sun).
D. He showed that an atom has a small massive core which has positive
charges surrounded by empty space in which electrons are found.
31. Which is true about subatomic particles?
A. Protons are smaller than neutrons and electrons.
B. Protons have an electric charge of negative one (-).
C. Protons and electrons make up the nucleus of an atom.
D.Protons and neutrons are relatively heavier than electrons

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