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28, 29 and 23 28. The atomic mass of an element is 32.06 u and its atomic number is 16. The oxide of this element d...
1) Define the following: matter, element, atom, trace element, proton, electron, neutron, atomic number, mass number,...
1) Define the following: matter, element, atom, trace element, proton, electron, neutron, atomic number, mass number, isotopes, radioisotope, molecule, compound, salt, ion. 2) List the 6 elements that make up about 99% of the weight of an organism. 3) What are the functions of the trace elements iron, fluorine (fluoride), and iodine? 4) An iodine deficiency can result in goiter. True/False 5) Where are protons, neutrons and electrons located? 6) Can you determine the atomic number and mass number from...
22. What is the hybridization on carbon in C2H2? C) sp E) sp3d2 D) sp3d A) sp3B) sp2 23. What is the pH of a 1.0x 109 M solution of HCI? 24. What is the pH of a 0.1 M aqueous solution of NaOH? 25...
22. What is the hybridization on carbon in C2H2? C) sp E) sp3d2 D) sp3d A) sp3B) sp2 23. What is the pH of a 1.0x 109 M solution of HCI? 24. What is the pH of a 0.1 M aqueous solution of NaOH? 25. Which compound will form an acidic solution when dissolved in water? F) Ba(CH3COO)2 E)Ca(NO3)2 D) Kl С) NaCl B) KNO2 A) NHcl
22. What is the hybridization on carbon in C2H2? C) sp E) sp3d2...
28. Describe the pH of the following salts? NaF, NH,CI, KI, NH.F A) acidic, basic, neutral,...
28. Describe the pH of the following salts? NaF, NH,CI, KI, NH.F A) acidic, basic, neutral, cannot tell without further information B) neutral, acidic, neutral, cannot tell without further information C) neutral, acidic, neutral, neutral D) basic, acidic, neutral, cannot tell without further information E) basic, acidic, neutral, neutral 29. Which of the following salts is(are) considered basic when dissolved in water? I NaNO IL K PO III NH C A) l only B) II only C) land il D)...
The answers are 23 (D), 28 (A), 30 (A), and 31 (D). Please show the step...
The answers are 23 (D), 28 (A), 30 (A), and 31 (D). Please show
the step by step solution. I need to understand HOW to do these
problems so please only answer if you can help.
Thank you in advance!
15. (N) 23). A 5 kg object that moves along the x-axis is acted upon by a net force that varies with position as shown in the figure at right. The kinetic energy of the particle at x= -2 m...
The following primary standards can be used for the standardization of bases except. a. Benzoic acid...
The following primary standards can be used for the standardization of bases except. a. Benzoic acid b. Oxalic acid c. CaCO3 d. KHP A solution that may contain NaOH, Na 2CO3, and NaHCO3, alone or in compatible combination was titrated with 0.1200 M HCl. The volume of the acid required to reach the phenolphthalein endpoint was 25.67 mL while 38.13 mL to reach the methyl red endpoint. What are the components of the mixture? a. Na2CO3 only b. NaOH only...
e. 18 Test Your Knowledge MULTIPLE CHOICE: Choose the one best answer. 1. Each element has...
e. 18 Test Your Knowledge MULTIPLE CHOICE: Choose the one best answer. 1. Each element has its own characteristic atom in which a. the atomic mass is constant. b. the atomic number is constant. c. the mass number is constant. d. Two of the above are correct. e. All of the above are correct. 2. Which of the following is not a trace element in the human body? a. iodine b. zinc c. iron d. calcium e. fluorine 3. A...
19) Iron is produced from its one by the reactions 2 C O 2 Fe:O )...
19) Iron is produced from its one by the reactions 2 C O 2 Fe:O ) CO 2 es 3COAR) How many moles of Ol) are needed to produce 1 mole of Fe(s)? a) 1/2 mole o 1/4 moto 1 mole O d) 3/2 moleo 20) Iron (1) sulfate reacts with potassium hydroxide in aqueous solution to form a precipitate. The net lonic equation for this reaction is: a) Fel. 50. Feso, 2 50, SO. c)Fe +20 Feco ). d)...
In the lab, a student determines the density of a metal object by measuring its mass...
In the lab, a student determines the density of a metal object by measuring its mass on a balance and its volume by displacement in a graduated cylinder. The data collected by the student is shown. mass of object: 44.701 g volume of water in cylinder before object submersed: 29.47 ml volume of water + object in cylinder: 35.33 mL Calculate the density of the object. d= g/mL Based on the recorded volume data, and assuming that the student used...
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...
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...
22. What is the hybridization on carbon in C2H2? C) sp E) sp3d2 D) sp3d A) sp3B) sp2 23. What is the pH of a 1.0x 109 M solution of HCI? 24. What is the pH of a 0.1 M aqueous solution of NaOH? 25. Which compound will form an acidic solution when dissolved in water? F) Ba(CH3COO)2 E)Ca(NO3)2 D) Kl С) NaCl B) KNO2 A) NHcl
22. What is the hybridization on carbon in C2H2? C) sp E) sp3d2...
28. Describe the pH of the following salts? NaF, NH,CI, KI, NH.F A) acidic, basic, neutral, cannot tell without further information B) neutral, acidic, neutral, cannot tell without further information C) neutral, acidic, neutral, neutral D) basic, acidic, neutral, cannot tell without further information E) basic, acidic, neutral, neutral 29. Which of the following salts is(are) considered basic when dissolved in water? I NaNO IL K PO III NH C A) l only B) II only C) land il D)...
The answers are 23 (D), 28 (A), 30 (A), and 31 (D). Please show
the step by step solution. I need to understand HOW to do these
problems so please only answer if you can help.
Thank you in advance!
15. (N) 23). A 5 kg object that moves along the x-axis is acted upon by a net force that varies with position as shown in the figure at right. The kinetic energy of the particle at x= -2 m...
e. 18 Test Your Knowledge MULTIPLE CHOICE: Choose the one best answer. 1. Each element has its own characteristic atom in which a. the atomic mass is constant. b. the atomic number is constant. c. the mass number is constant. d. Two of the above are correct. e. All of the above are correct. 2. Which of the following is not a trace element in the human body? a. iodine b. zinc c. iron d. calcium e. fluorine 3. A...
19) Iron is produced from its one by the reactions 2 C O 2 Fe:O ) CO 2 es 3COAR) How many moles of Ol) are needed to produce 1 mole of Fe(s)? a) 1/2 mole o 1/4 moto 1 mole O d) 3/2 moleo 20) Iron (1) sulfate reacts with potassium hydroxide in aqueous solution to form a precipitate. The net lonic equation for this reaction is: a) Fel. 50. Feso, 2 50, SO. c)Fe +20 Feco ). d)...
In the lab, a student determines the density of a metal object by measuring its mass on a balance and its volume by displacement in a graduated cylinder. The data collected by the student is shown. mass of object: 44.701 g volume of water in cylinder before object submersed: 29.47 ml volume of water + object in cylinder: 35.33 mL Calculate the density of the object. d= g/mL Based on the recorded volume data, and assuming that the student used...
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...
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...
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