school 10

QUESTION 1 Indicate whether the following experimental mistake will increase, decrease, or have no effect on the calculated value of R. In adjusting the final water level after the O2 was produced, the student adjusted the levels to the bottom of the water in the beaker and the top of the water in the flask (rather than correctly the top of each). See image below. Select ALL of the correct answers. Delivery Tubing Beaker Florence Flask a. The value of the calculated R is low. b. Water flows from the flask to the beaker. c. The volume measured from the beaker is unaffected. d. The value of the calculated R is high. e. The volume measured from the beaker is low. f. Water does not flow under these circumstances. g. Water flows from the beaker to the flask. h. The value of R is unaffected. O i. The volume measured from the beaker is high.

A local water retention pond was found to have elevated levels of mercury concentrated as 14 ng per liter. You would like to collect some mercury for your homemade perpetuum mobile machine. How many moles of mercury can you get you collect and process the entire volume of 1250 m3 of the water in the pond? 1.8 x 10-5 moles 4.4 x 10:5 moles 1.8 x 10-2 moles 8.7 x 108 moles 7.6 x 10-5 moles O 4.4 x 108 moles 8.7 x 105 moles

du.co Question 10 of 22 Balance the following chemical equation (if necessary): CH(g) + O,(g) → H,O(g) + CO,(g) 04- 03. 02. O+ O2+ D3+ 04+ 1 4 7 8 9. O3 04 Os + (s) (1) (g) (aq) CO CH.0 H,O Reset • x H,O Delete MacBook Air 80 DII F3 F4 F7 F8 F9 @ $ & 2 4 5 6 8 9 W E R Y S D F G H J K C V B M * CO *3

Vse 14.01 g.mol-1 4. Use the balanced reaction to answer the Question 11.015 mol-¹ and lu.00 g.mol 4 NH3(g) +502 19) -74 ND 19) + 6H2019) what is produced when 1000 grams ammonia react with 200.0 grams of oxygen? spremant ob CASVACE #w/c/1624013S (20051271 2010m the R 14 POHRE? 451201001 M 1964) 44 319691

Drawing activity. Draw a molecular structure of a section of a snowflake. Use at least 25 molecules of water.

3. Using this data, calculate a value for Kc for the reaction, A. 2.06 x 104 B. 4.84 x 10-3 C. 0.223 D. 4.49 E. 20.2 2 NO(g) + Cl₂(g) 2. NOCI(g) Kc = 3.20 x 10-³ 2 NO2(g) 2 NO(g) + O₂(g) Kc = 15.5 4. Using the data, NOCI(g) + 1/2O2(g) NO2(g) + ½ Cl₂(g) 3 A (g) + 4 B (g) A3B4 (g) calculate a value for Kc for the reaction, 3 A (g) + 4 B -A3B4 (g) 2 AB (g) + AB2 (g) (g) Kc = 25 Kc = 3.75 2 AB (g) + AB2 (g)

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: ny F1 ! Q What does a complete balanced chemical equation include? O F2 molar coefficients valence electrons exothermic coefficients 2 endothermic coefficients -0- @ W F3 -Ő+ #m 3 E F4 $ 4 F5 R % F6 T Q F7 6 Y F8 & 7 F9 *00 U 8 H

2 Fe + Oz →2 FeO 1. The numbers in red boxes are... A. subscripts B. coefficients C. reactants D. products 2. The chemicals in the purple box are... A. subscripts B. coefficients C. reactants D. products

7. You are helping to clean out the lab at the end of the term and find a bottle of liquid whose label has smudged. You know from its location that the bottle contains propanol (C3H8O), ethyl acetate (C4H8O2), or both. You burn 0.300 g of the liquid and obtain 0.624 g of carbon dioxide. What compound(s) do you have in the bottle, and what is their percent by mass in the 0.300-g sample?

Post-Lab Questions 1. Discuss how each of the following actions would affect the calculated % oxygen in the magnesium oxide compound. Would the percentage be too high, too low, or remain the same? a. The evaporation of water caused "spattering." tion b. Water was not completely removed by evaporation. 2. The white powder often found on objects made of aluminum is aluminum oxide, Al,O, A 5.00 g strip of aluminum is reacted in air, producing an oxide weighing 9.36 g. Calculate the percent oxygen and aluminum in the compound. 3. Aluminum oxide has the empirical formula of Al,O3. a. Calculate the % aluminum in Al,O3, using the chemical formula. b. Calculate the % error for the percent aluminum calculated in question 2. 85 COPYRIGHT 2013 Cengage Learning

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Identify the coefficient and the subscript from the formula 5CO2 Coefficient subscript Count the atoms present for each representative element in each of the compounds in the table below. 1. CH 2. Fe,(SO.). Fe = S = 3. 2Ca(OH); C= Ca = Total = H = Total = Total =

D ← Chapter 3 Homework Question 12 of 14 View Policies Current Attempt in Progress Jud AUTOS Save for Later < 7 0 Chapter 3 Homework: Allie Burt 13 mol Cu/mol Zn education.wiley.com Ć Prince's metal, a form of brass which looks like gold, is a mixture of copper and zinc. Prince's metal is 75% copper and 25% zinc by mass. What is the mole ratio of these metals in Prince's metal? WP NWP Assessment Player Ul Application -/1 = : Attempts: 0 of 3 used Submit Answer Question 3 Multipart Question 4 Multipart Question 5 Multipart Question 6 Multipart Question 7 Multiple Choice Question 8 Numeric Fill in the Question 9 Numeric Fill in the Units Question 10 Multiple Choice Question 11 Multiple Choice Viewing Que Math Fill in the Bl Question 13 Numeric Fill in the

Calculate the empirical formula for each stimulant based on its elemental mass percentage composition? Show Work? a. Nicotine (found in tobacco leaves) C 74.03% H 8.70% N 17.27%

Request They Both Die at t... ula Enchanted Wa... Question 6 of 20 Balance the following chemical equation (if necessary): Sio,(s) + C(s) → Si(s) + CO(g) 04- 2. 3+ O4+ 1 6. 7 8. 9. Os 6. O9 (s) (1) (g) (aq) C Si Reset • x HO Delete MacBook Air 000 F3 F4 F5 @ %23 2$ % 2 3 5 6. 8 9. W E 5 4- 3. 2. 14

Please answer 5,6,7,8. I submitted already and only got answer for number 4. Please help with the rest.

Task 1: Let's Practice! Directions: Answer the following problems and show your complete solution in a sheet of paper.(5 points each) 1. A compound of molar mass 270 contains 17.0% sodium, 47.4% sulfur and 35.6% oxygen. What is its molecular formula? 2. Nicotine, an alkaloid in the nightshade family of plants that is mainly responsible for the addictive nature of cigarettes, contains 74.02% C, 8.710% H, and 17.27% N. If 40.57 g of nicotine contains 0.2500 mol nicotine, what is the molecular formula?

Consider the beer Samual Adams Boston Lager, that has an approximate alcohol content of 4.5. Which is the amount of ethanol (C2H6O) per volume of beer. If you assume a bottle of beer is 12 fl oz (354 mL), how many moles of ethanol are in the bottle? The density of ethanol is 0.789 g/mL.

Question 10 Listen If you have not weighed out enough solid compound on the balance, you should... a) pour more compound in your hand and then add it to the weigh boat on the balance. b) throw out the sample in the trash and start over. c) remove the weigh boat and add more compound, then reweigh the sample. d) throw out the sample in the waste container and start over. e) pour more compound in the weigh boat on the balance.

12. Use the following equations to answer the next four questions: i. H2O(s) → H,O(1) Water ii. Na (aq) + Cl (aq) + Ag*(aq) + NO3 (aq) AgCl(s) + Na*(aq) + NO3 (aq) ii. CH3 OH(g) + O2(g) → CO2 (g) + H,O(g) -> iv. 2H,0(1) → 2H2(g) + O2(g) -> v. H* (aq) + OH (aq) H20(1) (a) Which equation describes a physical change? (b) Which equation identifies the reactants and products of a combustion reaction? (c) Which equation is not balanced? (d) Which is a net ionic equation?