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Clicker #1. Which of the following best describes the substance XeF 4 ? I. Element II. Molecule III. Compound IV. Heterogeneous mixture V. Homogeneous mixture A) III only B) I, II C) II, III, IV D) II, III, V E) II, III. Clicker #2.
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Clicker #1 Which of the following best describes the substance XeF4? I. Element II. Molecule III. Compound IV. Heterogeneous mixture V. Homogeneous mixture A) III only B) I, II C) II, III, IV D) II, III, V E) II, III
Clicker #2 Which of the following statements regarding Dalton’s atomic theory are still believed to be true? I. Elements are made of tiny particles called atoms. II. All atoms of a given element are identical. III. A given compound always has the same relative numbers and types of atoms. IV. Atoms are indestructible. A) I only B) I, II, III C) I, III D) II, III, IV E) II, IV
Clicker #3 Dalton’s theory does not explain: A) why water is “sticky” (attracted to itself). B) why some elements are diatomic. C) why elements have different reactivities. D) why some elements or compounds conduct electricity. E) any of the above.
Clicker #4 How many of the following are true regarding the number of protons in an atom? I. Identifies the element. II. Gives the number of electrons in a neutral atom. III. Gives the number of neutrons in a neutral atom. IV. Tells the element’s atomic number. A) 0 B) 1 C) 2 D) 3 E) 4
