06-05_task1

Concentration (mg/ml) Time (min) 8.5 0.5 6.8 5.4 1.5 4.0 2 3.2 2.5 2.5 3 What will be the slope of the line using the given first and second values? What will be the y-intercept, still using the given first and second values? Completely state the equation of the line. nlcot olN5

5. Why is decantation rather than filtration the preferred method of separating the salt from the mixture? 12:03 AM

Part I. Complete the following chemical reactions. Do not forget to balance the reaction, the states of matter and answer any questions that are asked. In the next reaction, a gas is formed. (19 points). HCl (aq) + Mg (s) → Gas that was released: Mg (s) + O2 (g) → Cu2S (s) + O2 (g) → Gas that was released:

Standardization of Sodium Hydroxide (NaOH) Solution Mass of KHP used (g) Initial buret reading (mL) Final Buret reading (mL) Link to video explaining how to do the following calculations Volume of base used (mL) Molarity of the NaOH solution (M) Titration of the Acetic Acid in Vinegar - WATCH THE VIDEO FOR A CALCULATION WALKTHRU Volume (mL) of Vinegar used Initial buret reading (mL) Final buret reading (mL) Volume of base used (mL) Molarity of the Acetic Acid in the Vinegar (M) HINT: Use as the M of base Trial 1 Link to video explaining how to do the following calculations 0.7138 1.15 18.97 Try 1: ✔ 17.82 2 2 Info ID41 NG 6 Info ID51 Trial 1 5.00 1.98 21.97 NG 2 Info ID121 NG 6 Info ID131

When HCI(aq) is added to calcium carbonate solid, carbon dioxide gas, liquid water and aqueous calcium chloride form: CaCO3(s) + 2HCI(aq) → Co,(g) + CaCl,(aq) + H,0(1) This reaction is used by geologists to confirm the presence of limestone (calcium carbonate) in minerals. In this experiment you are trying to determine the effect of concentration of HCI(aq) on the production of carbon dioxide. a. Based upon the information above, come up with a question to answer. (C:1) You can use the following equipment to answer this question: calcium carbonate chips, 1.90 mol/L HCI(aq), pH meter (measures hydrogen ion concentration), beaker, timer, apparatus to measure gas produced b. Based upon the equipment provided above, design a procedure to answer your question. Ensure you provide numbered steps. (1:3, C:2) c. Hypothesize an answer to your question. (I:1) Give reasons for your hypothesis. Ensure you are very specific. (A:3) From your experiment, you collect the following data:

PHYSICAL TEST Instructions: Note the SOLUBILITY of each of the samples in the beakers by writing dissolve or did not dissolve. Base on the table for solubility, describe the solubility of SUCROSE in ETHANOL. Answer the highlighted numbers. 1. 2. 3. Which of the two samples is comparative to the standard? SOLUBILITY TABLE (see tables)

13) 16.0 grams of a certain food contain 130 calories. How many grams of this food would you need in order to consume 2150 calories? 14) The speed of sound in air is about 343 m/s. What is this speed in miles per hour? 15) If the gas in England costs £2.99/1, what is the cost in $/gal? (assume E1.00 = $1.50) 16) Calculate the density of mercury (13.6 g/cm) in units of kg/m³. 17) The daily dose of antibiotic for the treatment of an ear infection is 115 mg/kg of body weight. If the antibiotic tablets are available in 250. mg size, calculate the number of tablets that a 33.5 lb. child must take per day. 1 1

12. A buret is filled with deionized (DI) water and the stopcock is used to adjust the meniscus of the water in the buret to an initial value of 1.06 mL. The stopcock is opened and the DI water is dispensed in a flask. The stopcock is closed and the final buret reading is 15.72 mL. The volume of DI water (mL) in the flask is 14.66 35.34 16.8 14.7

1 of 22 > Line 1 6 - 4 3. Answer Bank Line 1 shows that cogs are inversely proportional to sprockets. Line 2 1 3 5 6 . 7 8 . 6. Line 1 shows that cogs are directly proportional to sprockets. Sprockets Line 2 shows that cogs are directly proportional to sprockets. Line 2 shows that cogs are inversely proportional to sprockets. 13 人tv T W. Cogs 4.

10. A scientist performs an experiment and then records the times required for a certain chemical reaction to occur. The times for the reactions to occur are normally distributed and have a mean time of 38 s and a standard deviation of 2.3 s. Use z-score tables or technology to answer the following questions. a) What percentage of chemical reactions occur between 41 s and 43 s? b) What percentage of chemical reactions occur in less than 39 s? Page 5 STATISTICS-REVIEW ASSIGNMENT c) If 200 experiments are performed in the same manner as above, how many can the scientist expect to have chemical reactions that take longer than 43 s?

6:59 PM Thu Sep 21 STARTING AMOUNT here or pull up for additional resources 1 Q A X 2 W S #3 E D Ascorbic acid (C₂H₂O) is also known as Vitamin C. What quantity in molecules of C₂H₂O does a Vitamin C drink with 1025 mg C₂H₂O contain? ADD FACTOR 6.022 x 1023 x( ) 2.925 x 1022 2.925 x 10-22 4 $ R 100 1025 3.505 x 10-² 176.12 F % 5 T Question 9 of 21 G 1000 6 5.68 x 10-³ 0.001 mg C₂H₂O₂ g C₂H₂O molecules C₂H₂O₂ mol C₂H₂O g/mol C₂H₂O. ANSWER 3.505x 1024 2.925 x 10- 88.07 Y 0.010 & 7 U RESET 3.505 x 10¹¹ 5.68 x 102⁰ 2.925 x 10% 2.925 x 10 6.022 x 10²² 2 8 H J ( 1 9 O KL P ¡ { LTE C W

How many grams of MgCl2 in 30.00 mL of a 25.5 ppt solution ? (30.00 mL)(- mL а. 25.5 b. 100.0 С. 2 d. 30.00 f. 24 е. 6 i. 18.0 g. 3 h. 36 j. 1 k. 6.00 x 10-3 I. 3.60 х 10-2 m. 6.00 x 10-2 n. 5 О. 3.0 х 102 р. 1.80 х 10-2 9. 7.65 х 10-10 г. 2.63 S. 7.89 t. 5.26 и. 1012 V. 109 w. 106 х. 103 у. 101 z. 10

Each point on the graph displays the amount of carbohydrates and calories found in ; cup of different vegetables. A line-of-best fit is also shown. 25 20 15 10 1 2 3 4 Carbohydrates (in grams) 5 Which linear equation best represents the line-of-best fit shown? O y = 3x – 4 O y= 4x + 3 O y 4r 6 O y = 5x +7 届 Calculator Calories

O Macmillan Learning One important test for kidney disease involves measuring the levels of bicarbonate (HCO,) in blood. Normal bicarbonate levels for a person ranging in age from 18 to 59 years old is 23-29 mmol/L. A lab purchased a new instrument to measure bicarbonate levels in blood and needs to certify it against their current instrument. The bicarbonate levels in the blood of a 38 year old woman was measured using the old and new instrument. The blood was tested 6 times using each instrument. The mean concentration of bicarbonate using the old instrument was found to be 24.4 mmol/L. with a standard deviation of 1.54 mmol/L. The new instrument yielded a mean concentration of 25.5 mmol/L with a standard deviation of 0.48 mmol/L... Determine if there is a significant difference in the standard deviations of the two sets of measurements made by the two instruments at the 95% confidence level. Determine the value of Fale Feale= 10.293 Determine the value of Fuble- Refer to the table…

3:52 Chegg 12.94 46 | ... KB/s expert.chegg.com/expertqna (2) Home Expert Q&A My answers My stats Today CF Score: Answered: Skipped: Time remaining: 00:09:20 Chemistry please neat writing! 13.28 Pick an appropriate solvent(s) from table to dissolve each of the following substances. Common Polar Common Nonpolar Solvents Solvents water hexane (H₂O) (C6H12) acetone diethyl ether (CH3CH₂OCH2CH3) (CH3COCH3) methyl alcohol (CH3OH) toluene (C7H8) Part A glucose (polar) Express your answer as a chemical formula. If there is more than one answer, separate them by a comma. ΑΣΦ ? Part B salt (ionic) Express your answer as a chemical formula. If there is more than one answer, separate them by a comma. ΑΣΦ ? Part C vegetable oil (nonpolar) Express your answer as a chemical formula. If there is more than one answer, separate them by a comma. ΑΣΦ ? Part D sodium nitrate (ionic) Express your answer as a chemical formula. If there is more than one answer, separate them by a comma. 2= | ΑΣΦ 1 ? Answer…

A+BC<>AB+C What will most likely be in thecontainer after several minutes havepassed ?A. Container will have only AB & CB. Container will have only A & BCC. Container will have a mixture of all

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A student sets up the following equation to solve a problem in solution stoichiometry. (The ? stands for a number the student is going to calculate.) Enter the units of the student's answer.   I'm confused on what the next step is from here. I dont know if I need to switch the 10-3 to the bottom to make the 103 and how would I solve the problem from here?

To answer this question, click on the "x" in the square root sign and use equation editor to enter your answer. A bag of Hershey's kisses contains the following information Serving size=15 pieces 60g %3D A: If the bag contains 3.0 lb of Hershey's Kisses, how many kisses are in the bag? B: If the density of a Hershey's kiss is 1.8 g/mL, what is the volume of one single Hershey's Kiss dit View Insert Format Tools Table

A bicyclist is stopped at the entrance to a valley, as sketched below: A B D Where would the bicyclist have the highest potential energy? (choose one) ] Where would the bicyclist have the lowest potential energy? (choose one) Where would the bicyclist have the highest kinetic energy? (choose one) v Where would the bicyclist have the highest speed? (choose one) v Would the bicyclist's kinetic energy be higher at A or B? (choose one) Would the bicyclist's potential energy be higher at A or B? (choose one)

For Q6. I am uncertain on how 20.49 is the answer because I thought we’d use the figure with least sig figs which is 1 sig fig in this problem. I’m confused on why it’s 4 sig figs in the answer.

ity 7 Problem-Solving! ctions: Show your solution in the space provided. Follow the GFFSA (Given, Find, omula, Solution, Answer) format if possible. Write your answers in the space provided. (5 points each) 1. Combustion of hydrocarbons like methane (CH4) produces two products, water (H2O) and carbon dioxide (CO2). Consider the chemical equation of this combustlon: CH4 + 2 02- CO2 + 2 H20, when 4 mol of CHa reacts with 4 mol of O2, how many moles of CO2 are formed? What is the limiting reactant? 2. How many grams of lead II chloride are produced from the reaction of 16.2 g of NaCl and 62.0 g of Pb(NO3)27 What is the limiting reactant? How much excess is left over?

The solubility of Mg(OH), in water at 25 °C is measured to be 0.0096 Use this information to calculate Ke, for Mg (OH)2. L sp Round your answer to 2 significant digits. x10

Refer to the table below. Answer the questions that follow. Express all your answers in four decimal places. Note: Do not round off the values of the slope and the y-intercept.Please keep your units consistent while calculating for the answers. Enclose in a box/highlight your final answers.  answer letter B

A student sets up the following equation to convert a measurement.(The ?stands for a number the student is going to calculate.)Fill in the missing part of this equation. Note: your answer should be in the form of one or more fractions multiplied together.

A bicyclist is stopped at the entrance to a valley, as sketched below: Where would the bicyclist have the highest potential energy? (choose one) Where would the bicyclist have the lowest potential energy? (choose one) v Where would the bicyclist have the highest kinetic energy? (choose one) v Where would the bicyclist have the highest speed? (choose one) v Would the bicyclist's kinetic energy be higher at A or B? (choose one) Would the bicyclist's potential energy be higher at A or B? (choose one) Would the bicyclist's total energy be higher at A or B? (choose one) Suppose the bicyclist lets off the brakes and coasts down into the valley without pedaling. Even if there is no friction or air resistance to slow him down, what is the farthest point the bicyclist could reach without pedaling? (choose one) v

Identify each of the following changes as either exothermic or endothermic • + + • • • • • 3C(s) + 2Fe₂O₂(g) catalyst 4Fe(s) + 3C0���(g) 4HNO3(aq) + 5N₂Hä(I) → 12H₂O(g) + 7N₂(9) 4C₂H5NO2(1) + 902(g) → 8CO2(g) + 10H₂O(l) + 2N2(g) + 3893.9 kJ 2NaAlO₂(aq) + 3H₂(g) + 850.0 kJ → 2NaOH(aq) + 2Al(s) + 2H₂O(1) The temperature of the surroundings increases. The products of a reaction have more potential energy than the reactants. The system absorbs energy. Potential Energy (kJ) ΔΗ> 0 Reactants ΔΗ < Ο The temperature of the surroundings decreases. Potential Energy (kJ) The reactants have more potential energy than the products. Reactants AH° +458.7 kJ Reaction Pathway The system releases energy. AH-2462.0 kJ Products Products Reaction Pathway

Calculate the mass of carbon needed to form 6.08 moles of iron according to this reaction: 2Fe2O3 + 3C --> 4Fe + 3 CO₂ Click 'add attachments to support your work' then click 'add a file' to upload your work. Your Answer: Answer units

of 41 > Identify each transition in this flowchart as a chemical change or a physical change. chemical chemical 800 physical chemical chemical 8888 Answer Bank chemical physical 1x 64°5 Clanr 88 8. 8.

Aktiv Chemistry → C < + X b Success Confirmation of QX M Your Chemistry answer is rex b Answered: How many mL o x b Answered: A student combi x app.101edu.co Time's Up! A 0.660 M solution of KCI needs to be prepared through dilution. A 2.00 M stock solution will be added to a 0.250 L volumetric flask and then water will be added to the 0.250 L mark. Determine the volume (in mL) of the 2.00 M stock solution of KCI needed to produce this solution. 1 4 7 +/- New Tab 2 5 8 mL 3 6 9 G 0 x + Submit X C x 100

Analytical chemist from Petroleum Development Oman extracted petroleum from crude oil and measured the quantity lost by the extraction to tell how much of the petroleum was . Quantity of Petroleum lost %): 10.8, 11.6, 9.4, 7.8, 9.2, 9.1 , 10.6, 11.6 Should the value 7.8 be rejected from the set of the above results.

9:37 ® d y LABORATORY-ACTIVITY-4 - Saved 目 LABORATORY ACTIVITY 4 PHYSICAL PROPERTIES OF MATTER I. OVERVIEW A physical property is a characteristic that can be observed and measured without changing the identity and composition of the substance. Examples of physical properties are color, melting point, and boiling point. Physical properties are very important because these help chemists in identifying substances. For example, a clear, colorless liquid observed to boil at 100 and freeze at OE would definitely be water. Water undergoes physical change wherein its physical appearance changes but its composition remains unchanged. I. ОВIЕСTIVES 1. To be able to determine the physical properties of matter. III. MATERIALS 1 long liwanag candle (remove the tip and cut into 2-inch, 3-inch, and 4-inch long) 3 iron nails (1-inch, 2-inch, and 4-inch long) Water Clear straight glass (calibrate: 1mm = 1 mL) Weighing scale IV. PROCEDURE 1. Describe the hardness and color of the candle and iron nails.…

Help me create a digital dashboard for tracking "your life". Choose four areas you want to track and determine 3 ways in which you would measure each area. (ex. If you track eating habits, you might want to measure calories and place unacceptable levels in red and acceptable levels in green.)  Then determine whether you can find any correlations among the areas in your life. It should simulate what your preferred dashboard will look like ( a good dashboard provides all required information at a quick glance).