Purchase Solved CHEM 120 Unit 4 Midterm Exam (Collection)

Purchase Solved CHEM 120 Unit 4 Midterm Exam Collection

CHEM 120 Unit 4 Midterm (Jan 2021)

1. Question: The correct isotope symbol for the isotope containing 1 proton and two neutrons – He
2. Question: Which are the elements with the following electronic configuration:
3. Question: Provide 4 examples of substances with ionic bonds
4. Question: Name the following:
5. Question: A gas is enclosed in a 10.0 L tank at 350 mm Hg pressure. The gas is pumped into a 23.00 L vessel, what is the new pressure
6. Question: The molarity of a solution that contains 12.5 g of KClO3 in 3.2 liters of the solution is
7. Question: What other compound could also be added in order to make a buffered solution with each of the following:
8. Question: Balance: C₂H₄ + O₂ → CO₂+ H₂O
9. Question: For the balanced chemical reaction:
10. Question: List the number of protons, neutrons, and electrons for^–
11. Question: An isotope has 21 protons and 19 neutrons. What would be the mass number of this isotope
12. Question: What are the correct formulas for the compounds formed between
13. Question: Compute the pH of the following solutions with the [H3O+] = 1.2 x10-3 – [H₃O] = 1.2 x10^-3 pH=3
14. Question: At what temperature will 0.654 moles of neon gas occupy12.30 liters at 1.95 atmospheres?
15. Question: Determine the volume occupied by 2.34 grams of carbon dioxide gas at
16. Question: Calculate how many grams are in 0.700 moles of
    

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CHEM 120 Unit 4 Midterm Exam (Fall 2020)

1. Question: Joe conducts an experiment to test the effectiveness of a new drug for cancer. Which of the following variables would be easiest to control?
2. Question: A mixture containing 50 grams of carbon and 75 grams of oxygen is sealed in a flask. The total mass of the system is 225 grams. The flask is heated to cause the carbon and oxygen to react. The sealed flask is What is the mass of the sealed flask?
3. Question: Aluminum has a density of 2.7 g/cm3. What would be the mass, in g, of a block of aluminum with a volume of 15 cm3?
4. Question: How many kilometers are in 800 m?
5. Question: One mole is of carbon is equal to
6. Question: The element iron (Fe) occurs naturally as four isotopes. Each of these isotopes has
7. Question: How many neutrons are in this isotope of tin?
8. Question: The element with the ground state electron configuration of 1s2 2s2 2p6 3s2 3p5 is
9. Question: The number of protons in a chloride ion, Cl-, is
10. Question: When barium reacts with iodine, barium ions, Ba2+, and iodide ions, I-, are formed. In this reaction, iodine atoms
11. Question: Which substance has ionic bonds?
12. Question: The name of the compound S2O3 is
13. Question: In a nonpolar covalent bond, electrons are
14. Question: The formula of magnesium nitride is
15. Question: What is the electron dot structure of nitrogen?
16. Question: Which atom is least likely to form an ion?
17. Question: The formula mass of CO2 is
18. Question: How many moles of (NH4)2S are there in 75 g of (NH4)2S?
19. Question: The molarity of a solution that contains 8.0 g of NaOH in a liter of solution is
20. Question: How many liters of a 20% ethanol solution can you prepare by diluting 5 liters of a 40% ethanol solution?
21. Question: A chemist makes a solution by dissolving 14 g of NaCl to a volume of 350 mL in What is the mass/ volume % concentration of this solution?
22. Question: How many oxygen atoms are in the formula for iron(III) oxide?
23. Question: The best description of the shape of a boron trifluoride (BF3) molecule is
24. Question: Which of the following statements about molecules is correct?
25. Question: Match the compounds with their shapes:
26. Question: Match the ion or ground state atom to the correct number of electrons:
27. Question: Balance the equation: C3H8 + O2 → CO2 + H2O (6 points)
28. Question: For the balanced chemical reaction: 2 HCl + Mg(OH)2 → MgCl2 + H2  … – Determine the MW of MgCl2. Show your work. (3 points) … – Determine how many mols of HCl you would require to produce 20 grams of MgCl2. Show your work 
29. Question: How many ml of an 8 M KBr solution are required to produce 250 ml of a 2 M KBr solution?
30. Question: An isotope has a mass number of 67 and 39 neutrons. Determine the number of protons (2 points), the number of electrons (2 points), and the chemical symbol of this isotope (2 points).
31. Question: Your daughter is an avid jumper The current brand that she uses, ACE, wears out within 1 week and has recently worn out. You want to find a brand that lasts longer. Given the recent resurgence in this sport, there are a number of manufacturers claiming to have high performance jump ropes. Teammate 1 says that brand TTT is “the best!”, Teammate 2 says that brand ZZZ “is cool!”, and you also found a brand BBB jump rope at the discount store. Use the scientific method to approach this scenario. Formulate a testable hypothesis (2 points). Design an experiment to test your hypothesis, and include your controls, and be specific in your experimental design (4 points). Predict the experimental results that would support your hypothesis (2 points).
32. Question: Balance the equation: C3H8 + O2 → CO2 + H2O (6 points)
33. Question: For the balanced chemical reaction: 2 HCl + Mg(OH)2 → MgCl2 + H2 (a)Determine the MW of MgCl2. Show your work. (3 points) (b) Determine how many mols of HCl you would require to produce 20 grams of MgCl2. Show your work (3 points)
34. Question: How many ml of an 8 M KBr solution are required to produce 250 ml of a 2 M KBr solution?
35. Question: An isotope has a mass number of 67 and 39 neutrons. Determine the number of protons (2 points), the number of electrons (2 points), and the chemical symbol of this isotope (2 points).
36. Question: Your daughter is an avid jumper The current brand that she uses, ACE, wears out within 1 week and has recently worn out. You want to find a brand that lasts longer. Given the recent resurgence in this sport, there are a number of manufacturers claiming to have high performance jump ropes. Teammate 1 says that brand TTT is “the best!”, Teammate 2 says that brand ZZZ “is cool!”, and you also found a brand BBB jump rope at the discount store. Use the scientific method to approach this scenario. Formulate a testable hypothesis (2 points). Design an experiment to test your hypothesis, and include your controls, and be specific in your experimental design (4 points). Predict the experimental results that would support your hypothesis (2 points).
    

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CHEM 120 Unit 4 Midterm (Practice Problems)

1. Question: Identify each of the following as a substance or a mixture.
2. Question: Which of the following mixtures are homogeneous and which are heterogeneous?
3. Question: Change the unit for each of the following measurements by replacing the power of ten with an appropriate SI prefix.
4. Question: Carry out the following conversions.
5. Question: How many millimeters are there in 1.00 cm? In 1.83 m?
6. Question: What is the density, in grams per milliliter, of (a)a salt solution if 37.5 mL has a mass
7. Question: What is the mass, in grams, of (a)125 mL of castor oil, a laxative, which has a density
8. Question: What is the volume of (a)227 g of hexane (in milliliters) and (b)a 454-g block of ice
9. Question: Convert 195 K to degrees Celsius.
10. Question: Acetylene, used for welding, contains 24.02 g of carbon for every 2.02 g of hydrogen.
11. Question: Use the periodic table to determine the number of protons in an atom of each of the following elements.
12. Question: Without referring to the periodic table, give the atomic numbers of the elements with the following electron configurations.
13. Question: Without referring to Table 4.2, supply a symbol given the name or a name given the symbol for each of the following ions:
14. Question: Write a formula to match the name or a name to match the formula of the following binary ionic compounds:
15. Question: Classify the following covalent bonds as polar or nonpolar.
    

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CHEM 120 Unit 4 Midterm Exam (Review)

1. Question: How many kilograms are in 143 grams?
2. Question: How many milliliters are in 13.5 oz?
3. Question: Is ATM (atmospheres) a standard number?
4. Question: What is oxidized: _______________ REDUCING AGENT
5. Question: What is reduced: _______________ OXIDIZING AGENT
6. Question: The Scientific Method
7. Question: Density
8. Question: Metric; Measurement conversions (metric to metric only)
9. Question: Avogadro’s Number, mole
10. Question: Molar Mass
11. Question: Atomic Number, atomic mass, isotopes, number of protons, electrons, neutrons
12. Question: Calculating Bonds
13. Question: Naming element from electron orbital configuration
14. Question: Determining the molecular mass for a named molecule
15. Question: Nobel Gasses
16. Question: Iron (II) oxide, Iron (III) oxide
17. Question: Week 4 gas laws
18. Question: Oxidation and Reduction
19. Question: Tetrahedral, bent, pyramidal, and linear shapes and example molecules.

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