You were tasked to check if the liquid sample you have is a substance or a mixture.Which among these tasks is the BEST way to do so?Color comparisonTaste comparisonBoiling TestMelting Test1.I.II.IV.C. I, Il and IV onlyD. II and IV onlyA. I, II, III, IVB. I, II and III only2. A liquid has the following properties: one-phase, colorless, boils at varyingtemperature. Which of the following BEST describes the liquid?A. solutionB. substanceC. suspensionD. heterogeneous mixtureJill has an unopened box of a 2-meter foil labeled as 100% aluminum. Jill takes just athumb-sized piece of the aluminum foil. Which of the following statement is TRUEabout the piece of aluminum foil that Jill took compared with the rest that was left in thebox?3.A. Its mass and melting behavior are different.B. Its mass and melting behavior are the same.C. The mass is different, but the melting behavior is the same.D. The mass is the same, but the melting behavior is different.4. Which of the following lists of materials are composed of mixture?A. blood, calamansi juice, airB. carbon dioxide, bleach, oil5. A pinch of bread was placed inside a test-tube and heated until it became blackish incolor and released some gas. Which of the following statements are TRUE accordingto the given information?C. oxygen, sodium chloride, waterD. vinegar, 70% alcohol, carbon1. Bread is a solution.II. Bread is composed of only one substance.III. Bread is made up of solid and gaseous substance.IV. Bread is consisting of mixtures of different substance.A. Iand II6. A gaseous material has a strong smell, evaporates quickly, particularly boils at33.34°C and melts at-77.73°C. What is the classification of the material?A. metal7. Oliver heated a liquid ina casserole. He forgot to tum off the stove right away and theliquid was gone. He noticed that there were some solid materials which settled at thsurface of the casserole. What can be inferred from this observation? The liquiB. Il and IIC. Il and IVD. III and IVB. mixtureC. solutionD. pure substancewasA. a pure substanceB. composed of a single material8. Sodium chloride dissolves in water very well. Which is NOT TRUE in the followingstatements?A. Water is a pure substance.B. Sodium chloride is a pure substance.C. Dissolving sodium chloride with water produces a mixture.D. Dissolving sodium chloride with water produces a new substance.C. a mixture with dissolved solid materialsD. a pure substance because it evaporated

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Tou were tasked to check if the liquid sample you have is a substance or a mixture Which among these tasks is the BEST way to do so? Color comparison Taste comparison Boiling Test Melting Test I. II. II. IV. A. I, II, II, IV B. I, Il and Il only C. I, Il and IV only D. II and IV only arties: one-nhase, colorless, boils at varying

Tou were tasked to check if the liquid sample you have is a substance or a mixture Which among these tasks is the BEST way to do so? Color comparison Taste comparison Boiling Test Melting Test I. II. II. IV. A. I, II, II, IV B. I, Il and Il only C. I, Il and IV only D. II and IV only arties: one-nhase, colorless, boils at varying

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Table 1. pH of water samples Sample No. Water Samples pH 1 Tap water from household 6.59 2 Water from creek 7.35 3 Water from river 7.35 4 Unknown sample 7.00 Table 2. Absorbance of Samples Table 3. Calibration Curve Data* Sample No. Absorbance Absorbance 3- Concentration of PO4 Ions, ppm (1 pt each) 1 1.33 1.0 0.050 2 3.26 2.0 0.093 0.89 3.0 0.137 4 0.099 4.0 0.185 5.0 0.230 *Provided by the instructor II. Graph Determination of Phosphate Concentration 3- 1. Using Excel, plot the concentration of PO4* (x-axis) vs. absorbance (refer to Table 3) The olot must show the equation of the best-fit (or trend) line of the graph. Attach the graph below
1. A company illegally dumped their wastewater on a river bank. You are part of an environmental NGO that are tasked to determine what kind toxins that may have contaminated the waters. What kind of analysis would you do? a. Characterization analysis b. Qualitative analysis c. Fundamental analysis d. Quantitative analysis 2. Four groups weighed ten rock samples each, and tested the possibility of outliers using Q-test. At 95.0% confidence (a = 0.05), which of the following is considered to be an outlier? a. 0.024 b. 0.413 c. 0.453 d. 0.674 3. An unknown solution containing oxalic acid, which is a diprotic acid, is titrated against sodium hydroxide. How many mole/s of titrant is needed to react with one mole of analyte? a. ½ b. ¼ c. 2 d. 4
You were tasked to separate the components of a mixture containing silica, sodium chloride and charcoal. TNāCI dissolves in water while silica and charcoal are not water-soluble. Only charcoal dissolves in carbon disulfide. a. Write a short experimental procedure to carry out the separation of the mixture. b. Given the following data, determine the percentage of charcoal, sodium chloride and silica. Mass (g) Mass of beaker 100.000 Mass of beaker + mixture 110.000 mass of evaporating dish 62.000 mass of evaporating dish + solid after evaporation of water 65.000 Mass of beaker + charcoal + silica after evaporation of excess water 117.000 mass of beaker + silica after decanting dissolved charcoal and drying 113.545
VI. Flame Test Watch the following video: https://www.youtube.com/watch?v=kkBFG1mTSBk Record the color of the flame observed for each substance tested in the video. Solution Color Observed SrCl₂ NaCl KCI Solution LICI CuCl2 CaCl₂ Color Observed 1. Explain why colored flames are observed when elements are heated?
C. Pls answer asap . Pls provide accurate answer. Help me thank uuu. Handwritten thank u.
An 8 mL volumetric pipet is used to collect a sample from a 0.2015 M solution of NaOH. a. Estimate the uncertainties in volume and concentration. b. Calculate the moles of NaOH in the sample. c. Use error propagation to find the uncertainty in moles of NaOH.
A solution of a dye with an absorptivity coefficient (ε) of 3.75 x 102 M-1cm-1 had an absorbance of 0.039 measured in a cell whose width is 1.00 cm. What is the concentration of the dye in the solution? a. 1.46 x 10-3 M b. 1.04 x 100 M c. 1.04 x 10-4 M d. 1.46 x 101 M
8. Read the following burette. Burette reading %3D 14 15
A water sample was analyzed for iron content using the iron-phenanthroline method. Using the set of data from Question 15 (as presented below), Reagent Blank Absorbance Absorbance (au) Reagent Blank Absorbance 0.003 Concentration of Stock Solution: 10 ppm Volume of Stock Solution (mL) Total Volume of Standard Solution (mL) 0.50 10.00 1.00 10.00 2.00 10.00 3.00 10.00 4.00 10.00 5.00 10.00 Volume of Trial Unknown Solution (mL) 1 5.00 2 5.00 3 5.00 find the true concentration of Fe2+ of the original sample. A) 5.12 ppm B) 2.56 ppm 2.52 ppm D) 5.05 ppm Concentration of Standard Solution (ppm) Total Volume of Unknown Solution (mL) 10.00 10.00 10.00 Absorbance (au) 0.012 0.132 0.267 0.349 0.428 0.560 Absorbance (au) 0.289 0.296 0.281
A solution of FESCN2+ has a concentration of 1.00 x 10-M and an absorbance of 0.755. What is the concentration of an FeSCN2+ solution with an absodbance of 0.491? Enter your answer in scientific notation, with one decimal place, as follows: 2.3e-4 or 2.3E-4 Do not include units and note that 10 and x are NOT USED in this type of scientific notation. Question 3 of 26>»
Page 2 2. A 0.9527 g sample containing only KCI and CaCl2 yielded 3.9802 g of dried Hg2Cl2. Calculate the percent of each halogen compound in the sample. KCI = K* + CIr; CaCl2 = Ca2+ + 2C-; 2CI- + 2Hg* = Hg2Cl2 CI 35.453; K 39.0983; Ca 40.078; Hg 200.59
#9: This unknown contains 51.90 % C and 9.80 % H by mass with the remainder being an unknown element (you have to figure out what element). 100- Base 80 60 90 Relative Intensity 100 TRANSNETTANCE 40 20- O 4000 10 20 3000 30 peak 656 50 40 m/z REVENUTER 60 1300 peak 094 92-37= 90-35= C) 70 80 1000 90