17. Which of the following was identified through the alpha scattering experiment?
A.Electron B.neutron C.nucleus D.Proton
18. When equal volumes of sugar and water are mixed completely,the combined volume is less than the sum of the volumes of the unmixed sugar and water. What is the reason for this observation?
A. The water molecules could fit the spaces between the sugar molecules.
B. A small amount of water evaporated while sugar and water were being mixed.
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ANSWER!
17. Which of the following was identified through the alpha scattering experiment?
A.Electron B.neutron C.nucleus D.Proton
18. When equal volumes of sugar and water are mixed completely,the combined volume is less than the sum of the volumes of the unmixed sugar and water. What is the reason for this observation?
A. The water molecules could fit the spaces between the sugar molecules.
B. A small amount of water evaporated while sugar and water were being mixed.
C. The molecules of the water are in constant motion,which makes them evaporate easily.
D. The molecules of sugar are closer to each other so it is easier for them to come even closer to each other.
19. When electrons are lost or gained by the atom, the atom become:
A.an ion B.metal C.alkali D.noble gases
20. What is a common characteristics of all atoms of an element which is equal to the number of protons in the nucleus of an atom?
A. mass no. C.atomic no.
B. # of neutron D.charge
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