Chemistry: A Molecular Approach, 1st Edition

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Presentation transcript:

Chemistry: A Molecular Approach, 1st Edition Nivaldo J. Tro Chapter 2 Atoms and Elements

Which of the following statements about a carbon atom is correct according to the plum-pudding atom model? Nothing can penetrate a carbon atom. The carbon atom has a positive charge. The mass of the carbon atom is the same as the mass of all the electrons in the atom. The carbon atom has a negative charge.

Which of the following statements about a carbon atom is correct according to the plum-pudding atom model? Nothing can penetrate a carbon atom. The carbon atom has a positive charge. The mass of the carbon atom is the same as the mass of all the electrons in the atom. The carbon atom has a negative charge.

How many neutrons are in 1000 atoms of Cl-37? 37,000 20 20,000 cannot be determined

How many neutrons are in 1000 atoms of Cl-37? 37,000 20 20,000 cannot be determined

The atomic mass of Ga is the average of 68.9 and 71.9. The mass spectrum of gallium, Ga, is shown below. The atomic mass of Ga is 69.7 amu. Which of the following statements is correct? All Ga atoms weigh 69.7 amu. The atomic mass of Ga is the average of 68.9 and 71.9. The atomic mass of Ga will be closer to 69 than 71 because there are more atoms that weigh 68.9 amu. 68.9 amu, 60.1 % 71.9 amu, 39.9 %

The atomic mass of Ga is the average of 68.9 and 71.9. The mass spectrum of gallium, Ga, is shown below. The atomic mass of Ga is 69.7 amu. Which of the following statements is correct? All Ga atoms weigh 69.7 amu. The atomic mass of Ga is the average of 68.9 and 71.9. The atomic mass of Ga will be closer to 69 than 71 because there are more atoms that weigh 68.9 amu. 68.9 amu, 60.1 % 71.9 amu, 39.9 %

Which of the following elements will have properties most similar to Tin, Sn (at. no. 49)? lead, Pb (82) gallium, Ga (31) zinc, Zn (30) titanium, Ti (22) arsenic, As (33)

Which of the following elements will have properties most similar to Tin, Sn (49)? lead, Pb (82) gallium, Ga (31) zinc, Zn (30) titanium, Ti (22) arsenic, As (33) Sn Pb metal very malleable SnO, SnO2 PbO, PbO2 SnCl2, SnCl4 PbCl2, PbCl4

Which weighs more, a pea or a marble? Tro Chemistry: A Molecular Approach

Which weighs more, a pea or a marble? Tro Chemistry: A Molecular Approach

Which has more atoms, 10.0 g Mg or 10.0 g Ca? 24.30 40.08 Magnesium Calcium Both have the same number of atoms. Tro Chemistry: A Molecular Approach

Which has more atoms, 10.0 g Mg or 10.0 g Ca? 24.30 40.08 Magnesium Calcium Both have the same number of atoms. Tro Chemistry: A Molecular Approach