1. Consider three 1-g samples of matter: (a) oxygen-16, (b) oxygen-17, and (c) carbon-12. Rank them...
1. Consider three 1-g samples of matter: (a) oxygen-16, (b) oxygen-17, and (c) carbon-12. Rank them in terms of the number of atoms, from most to least.
2. Consider these atoms: (a) copper, Cu; (b) neon, Ne; (c) hydrogen, H. Rank them, from smallest to largest , in terms of size.
3. The isotope 12-carbon has a mass of 12.000amu, and the isotope 13-carbon has a mass of 13.003amu . Given that 98.93{\rm \\%} of all carbon atoms found in nature are 12-carbon and 1.07{\rm \\%} are 13-carbon, find the atomic mass of carbon, C(atomic number 6).
4. Which has more potential energy?an electron close to an atomic nucleus or one far from an atomic nucleus?
A. The potential energy of an electron that is close to an atomic nucleus is greater than the potential energy of an electron that is far from an atomic nucleus.
B. The potential energy of an electron that is far from an atomic nucleus is greater than the potential energy of an electron that is close to an atomic nucleus.
C. In both cases the potential energy of an electron is the same.
5. Does the periodic table explain the noble gas shell model, or does the noble gas shell model explain the periodic table?
A. The noble gas shell model is used to explain the organization of elements within the periodic table.
B. The periodic table is used to explain the concentric pattern of the noble gas shell model.
C. The periodic table and noble gas shell model are not related.
6. An electron confined to an atom has waves that are what?
A. Circular waves
B. Standing Waves
C. Traveling waves
Homework Answers
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1. Consider three 1-g samples of matter: (a) oxygen-16, (b)
oxygen-17, and (c) carbon-12. Rank them...
Atoms and Isotopes 1 Activity: Atoms and Isotopes Why? Atoms and isotopes are identified by the...
Atoms and Isotopes 1 Activity: Atoms and Isotopes Why? Atoms and isotopes are identified by the numbers of protons, electrons, and neutrons that they contain The number of protons, electrons, and neutrons in atoms determines the chemical properties of the elements .A knowledge of the number of protons and electrons in an atom will help you understand how atoms combine to form molecules Identify the composition of atoms in terms of protons, neutrons, and electrons Use atomic symbols to represent...
Which list incudes elements with the most similar chemical properties? B) Cr, Pb, Xe 37) D)...
Which list incudes elements with the most similar chemical properties? B) Cr, Pb, Xe 37) D) N, O, F O,S, Se C) As the elements in Period 3 are considered in order of increasing atomic number, there is a general decrease in C) atomic mass D) atomic radius A) first ionization energy B) electronegativity Element K reacts with chlorine to form an ionic compound that has the formula XCl,. To which group on the Periodic Table coul element X'belong? A)...
20) Which statement is NOT true about ionic bonds? A) An ionic bond occurs between positive...
20) Which statement is NOT true about ionic bonds? A) An ionic bond occurs between positive ions and negative ions. B) Electrons are completely lost or gained in ion formation An ion has the same number of electrons as a nonionic atom of the same element. D) A salt such as NaCl is formed by an ionic reaction. 21) Which of the following would be a proposed mechanism by which stomach antacids work? A) Antacids are bases and by definition...
Isotopes have _____ a. the same number of protons but different numbers of electrons. b. the...
Isotopes have _____ a. the same number of protons but different numbers of electrons. b. the same number of neutrons but a different number of protons. c. the same total number of protons and neutrons. d. the same number of protons but a different number of neutrons. e. the same atomic mass. Identify the element based on the following values for its three isotopes: 38.9637 amu (93.08%), 39.9640 amu (0.012%), and 40.9618 amu (6.91%). a. Cl b. Ar c. S...
18) From the following elements, one is not naturally diatomic molecule b- Nitrogen a-Oxygen d- Copper c- lodine 19...
18) From the following elements, one is not naturally diatomic molecule b- Nitrogen a-Oxygen d- Copper c- lodine 19) In the element Radium Ra, the number of protons, neutrons and electrons are respectively b-88, 88, 226 a- 88, 138, 88 d- 138, 88, 88 c-88, 226, 88 20) The empirical formulas of glucose CaHi:O, is b- CHO a- CiaHaO12 d-CH O c-CH:0 21) The compound NHa is a: b-A polyatomic cation a- A monoatomic cation d-A polyatomic anion c- A...
Question 1 What is the net electric charge (in units of e) of an atom of...
Question 1 What is the net electric charge (in units of e) of an atom of lead (Z82)? qlead exact number, no tolerance Attempts: 0 of 5 used Question 2 Suppose a lithium atom (Z units of e? 3) has been singly ionized. What is the net electric charge of the resulting lithium ion in lithium exact number, no tolerance Attempts: 0 of 5 used Question 3 Suppose a lead atom (Z = 82) has been doubly ionized. What is...
The smallest chemical units of matter are atoms b) molecules c) protons d) neutrons e) electrons...
The smallest chemical units of matter are atoms b) molecules c) protons d) neutrons e) electrons . Which of the following would have the largest size? a) an atom b) a molecule c) a proton d) a neutron e) an electron 3. Isotopes of an element differ in the number of a) protons in the nucleus b) electrons in the nucleus © neutrons in the nucleus d) electron clouds e) energy levels they contain 4. VO The atomic number represents...
1. The reaction 6f propane with oxygen follows the reaction below: Equation1 ) Balance Equation 1...
1. The reaction 6f propane with oxygen follows the reaction below: Equation1 ) Balance Equation 1 above i) is the above reaction endothermic or exothermic? Enstem i) Classify the reaction above as combination, single displacement, double displacement, decomposition or combustion. comba How much heat was produced in Equation 1 if it can heat 100 g of water from 32 °C? to 40 Is the energy in propane potential or kinetic energy? P。hhi vi) Given that 1 mole of propane produces...
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be...
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table? forms coloured compounds conducts electricity when solid can be used has low density as a catalyst X A X X Xx 2. (0620-W 2012-Paper 1/1-Q20) The diagram shows an outline of the Periodic Table. U V W X Y Which of the elements U, V, W, X and Y would react together in the ratio of...
In a reversible reaction, carbon monoxide gas and hydrogen gas are mixed to produce methanol gas...
In a reversible reaction, carbon monoxide gas and hydrogen gas are mixed to produce methanol gas (CH3OH). The enthalpy change of this reaction is AH = 90 kJ mol A mixture of 0.360 moles of CO and 0.640 moles of H2 were allowed to reach equilibrium at 150°C in a 10 dm' sealed container. At equilibrium the mixture contained 0.120 moles of CH,OH. (a) Calculate the K for this reaction (to 1.d.p). (10 marks) Similarly to Ko, K is an...
Atoms and Isotopes 1 Activity: Atoms and Isotopes Why? Atoms and isotopes are identified by the numbers of protons, electrons, and neutrons that they contain The number of protons, electrons, and neutrons in atoms determines the chemical properties of the elements .A knowledge of the number of protons and electrons in an atom will help you understand how atoms combine to form molecules Identify the composition of atoms in terms of protons, neutrons, and electrons Use atomic symbols to represent...
Which list incudes elements with the most similar chemical properties? B) Cr, Pb, Xe 37) D) N, O, F O,S, Se C) As the elements in Period 3 are considered in order of increasing atomic number, there is a general decrease in C) atomic mass D) atomic radius A) first ionization energy B) electronegativity Element K reacts with chlorine to form an ionic compound that has the formula XCl,. To which group on the Periodic Table coul element X'belong? A)...
20) Which statement is NOT true about ionic bonds? A) An ionic bond occurs between positive ions and negative ions. B) Electrons are completely lost or gained in ion formation An ion has the same number of electrons as a nonionic atom of the same element. D) A salt such as NaCl is formed by an ionic reaction. 21) Which of the following would be a proposed mechanism by which stomach antacids work? A) Antacids are bases and by definition...
Isotopes have _____ a. the same number of protons but different numbers of electrons. b. the same number of neutrons but a different number of protons. c. the same total number of protons and neutrons. d. the same number of protons but a different number of neutrons. e. the same atomic mass. Identify the element based on the following values for its three isotopes: 38.9637 amu (93.08%), 39.9640 amu (0.012%), and 40.9618 amu (6.91%). a. Cl b. Ar c. S...
18) From the following elements, one is not naturally diatomic molecule b- Nitrogen a-Oxygen d- Copper c- lodine 19) In the element Radium Ra, the number of protons, neutrons and electrons are respectively b-88, 88, 226 a- 88, 138, 88 d- 138, 88, 88 c-88, 226, 88 20) The empirical formulas of glucose CaHi:O, is b- CHO a- CiaHaO12 d-CH O c-CH:0 21) The compound NHa is a: b-A polyatomic cation a- A monoatomic cation d-A polyatomic anion c- A...
Question 1 What is the net electric charge (in units of e) of an atom of lead (Z82)? qlead exact number, no tolerance Attempts: 0 of 5 used Question 2 Suppose a lithium atom (Z units of e? 3) has been singly ionized. What is the net electric charge of the resulting lithium ion in lithium exact number, no tolerance Attempts: 0 of 5 used Question 3 Suppose a lead atom (Z = 82) has been doubly ionized. What is...
The smallest chemical units of matter are atoms b) molecules c) protons d) neutrons e) electrons . Which of the following would have the largest size? a) an atom b) a molecule c) a proton d) a neutron e) an electron 3. Isotopes of an element differ in the number of a) protons in the nucleus b) electrons in the nucleus © neutrons in the nucleus d) electron clouds e) energy levels they contain 4. VO The atomic number represents...
1. The reaction 6f propane with oxygen follows the reaction below: Equation1 ) Balance Equation 1 above i) is the above reaction endothermic or exothermic? Enstem i) Classify the reaction above as combination, single displacement, double displacement, decomposition or combustion. comba How much heat was produced in Equation 1 if it can heat 100 g of water from 32 °C? to 40 Is the energy in propane potential or kinetic energy? P。hhi vi) Given that 1 mole of propane produces...
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table? forms coloured compounds conducts electricity when solid can be used has low density as a catalyst X A X X Xx 2. (0620-W 2012-Paper 1/1-Q20) The diagram shows an outline of the Periodic Table. U V W X Y Which of the elements U, V, W, X and Y would react together in the ratio of...
In a reversible reaction, carbon monoxide gas and hydrogen gas are mixed to produce methanol gas (CH3OH). The enthalpy change of this reaction is AH = 90 kJ mol A mixture of 0.360 moles of CO and 0.640 moles of H2 were allowed to reach equilibrium at 150°C in a 10 dm' sealed container. At equilibrium the mixture contained 0.120 moles of CH,OH. (a) Calculate the K for this reaction (to 1.d.p). (10 marks) Similarly to Ko, K is an...
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