Chem 12 - Study guides, Class notes & Summaries

CHEM 121 FINAL EXAM 2024 Updated Questions and Answers Updated (2024 / 2025) (Verified Answers)- PORTAGE LEARNING

CHEM 120 Week 5 Exam 2 (Units 3 and 4)

1. A solution is prepared by dissolving 50 g of KCl (74.6 g/mol) to a volume of 1 L. What is the molarity of this solution? 2. You prepare a solution by dissolving 20 g of NaCl to a volume of 350 mL in water. What is the mass/volume % concentration of this solution? 3. When the following reaction goes in the forward direction, what is the base? 4. You are preparing a buffered solution. So far, your solution contains H2PO4- ions, what would you add to this solution to prepare your buffer sy...

Show the determination of the charge on the ion formed by the Mg12 atom. Mg has a +2 charge S 2S 2P 3S also you can just look at the periodic table and see that it is in collumn 2 on the left side and would know that it has a +2 charge because the 2 columns on the left are + this is day 1 chem 101 knowledge 12 2 2 6 2 Mg (metal = lose electrons) 1s 2s 2p 3s lose 2e → Mg 12 2 2 6 2 +2 Ques 10 / 10 pts tion 2

CHEM 120 Exam 3 1.To make octane (gasoline), 8 grams of carbon need to react with 3 grams of hydrogen. How many grams of hydrogen would be needed to react with 24 grams of carbon?

Hypothesis correct answer: a testable educated guess Experiment correct answer: how we test hypotheses Variable correct answer: Idea to be tested (only one) Control correct answer: Something the variable is tested against Experimental protocol correct answer: How do you do the test? Results correct answer: Data generated comparing variable to controls. Includes statistics to show results are meaningful Conclusion correct answer: Interpretation of results independent v...

Station 1. You have run an experiment studying the effects of the molecular weight of a compound on the rate of diffusion in agar. Compound X has a molecular weight of 25.3 g/mol and compound Y has a molecular mass of 156.2 g/mol. On two separate agar plates, 0.1 g of each substance were transferred and allowed to diffuse for 2 hours. The results below were obtained. Use this information about this situation to answer the following three questions. 1. Question: (CO 1) What was the independent v...

CHEM 120 Week 7 Lab practicum (100% Correct) Chamberlain University. If a patient has fever of 103 ◦F, convert it in degree Celsius 103F-32 / 1.8 = 39.44 C 2. You are given 500 mg NaCl. If it is dissolved in 7.5 mL water what would be the density in g/mL? 500 NaCL / 7.5 mL = 66.7 g/ml 3. Provide name of the following organic compound

CHEM 120 Week 8 Exam 3 (Units 5, 6, and 7)

define matter correct answer: anything that has mass and takes up space what is not considered matter? correct answer: light, heat, electricity definite shape, definite volume correct answer: solid indefinite shape, definite volume correct answer: liquid indefinite shape, indefinite volume correct answer: gas pure substance correct answer: one substance; definite and constant composition; can't be separated into 2 kinds of matter by physical means; single kind of matter ...