Lab 1

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/document/d/1KWoB0hrXolu7UEKbq4f8LBMHfpjHBRVU3qUzVI7K80U/edit Sample Work Format Tools Extensions Help + nt will $ 4 Normal text R f5 A % T 5 Calibri 12 13. The chemical equation for the decomposition of potassium chlorate (KCIO3 ) is 2 KCIO,(s) → 2 KCl(s) + 3 0₂(g) The molar masses of the elements in this equation are: K: 39.1 g/mol, Cl: 35.4 g/mol, O: 16.0 g/mol 담 ㅁ (b) How many moles of KCI are formed? Pathway: g of KCIO3 → mol KCIO3 → mol KCI Y If 30.6 g of potassium chlorate (KCIO3) reacts.. (a) How many moles of potassium chlorate(KCIO3) are there? Pathway: g of KCIO3 → mol KCIO3 7 + &1 BI U A 3 c) How many grams of KCI are formed? Pathway: g of KCIO3 → mol KCIO3 → mol KCI →g of KCI 18 U fg 8 I no 6 f10 © □ □E - †= = = = insert 9 5 $12 P prt scr L 7 64°F Mostly sunny G 1

Under what conditions are AH and AU for a reaction involving gases and/or liquids or solids identical? Match the items in the left column to the appropriate blanks in the sentences and the equations on the right. Reset Help AVP ΔΗ-Δυ+ | Δ(P) Δ( PV) AH and AU for a reaction involving gases and/or liquids or solids identical is the case if APV|= 0. nRT RT PV ΔΡV Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining

Normal text Times New. - 12 BIUA + E- 1E = E - E - EEX ... .. 2 3 1 4 I I. c. Water from the sodium hydroxide solution 15 I . 16 ... I7 .. 6. Students collected the following temperature data for a coffee cup calorimetry experiment: Table 1. Temperature of solution with time for the reaction of baking soda with vinegar as measured in a coffee cup calorimeter. Time since start of reaction Temperatu re (°C) nent will (min) 24.6 0.5 20.9 1.1 20.1 1.4 19.3 1.7 18.5 2.1 18.4 2.5 18.3 2.9 18.2 3.5 18.4 a. Calculate AT and show your work. b. Is the reaction endothermic or exothermic? MacBook Air DII F6 80 F4 F3 &. $ 23 5 4 2 3 Y W K H G F S M V CO

Conte X ALEK X O Rich x Ceng Bb Excel Bb What X O COVI e Daily x O Amon x e Chat N Ne www-awn.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNsikr7j8P3jH-lIJOkWvnm4w-aQ-rw-zRhgRnayfmbBs65spEVIGu-K5Jx48w9eOKISqsha Click to go forward, hold to see history Apps R Blackboard 2Mail - Ava Schied. O UAConnect Biology Syllabus J Labflow - Courses O Explore - HogSync O Packback + MyN Objective Knowledge Check Question 13 Calculate the mass of glucose (C,H,,0,) that contains a trillion (1.0 x 102) oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits. I Don't Know Submit O 2020 McGraw-Hill Edu MacBook Dro

Provided these items, what is Hess’s Law? Explain which part(s) of the experiment (procedure and/or treatment) it is applied.

The temperature of a reaction was monitored with an thermometer that is reported to have precision of 0.2 K (uniform distribution). If we used this thermometer to monitor the temperature change in a particular exothermic reaction, what is expanded uncertainty (use coverage factor k = 2) in the net temperature change for the following measurements: Temperature before reaction starts = 296.2 K Temperature after reaction is finished = 305.6 K Net temperature change = 9.4 K. Expanded uncertainty at the 95% confidence interval level (k = 2) = ? (include unit!) Answer: 0.3K

[(2.77 x 10^6) / 45.716] + 134.10

A chart is prepared by plotting In Ksp versus 1/T, using data obtained by performing a lab experiment. Refer to the attached photo for reference on how to solve these equations. Particularly #5 should be useful: A linear fit of the data in the chart yields the equation y = (-5.0020x10^3)x+(2.100x10^1) with an R2 value of 0.9922. Determine the enthalpy (deltaH in kJ) associated with dissolving KNO3. Answer in scientific notation with appropriate sigfigs.

professor Scimemi has accepted you as a Master’s student and you are involved in a project that studies the cellular basis of neuropsychiatric diseases. For your electrophysiology recordings you have to make a recording solution containing (in mM): 119 NaCl, 2.5 KCl, 2.5 CaCl2, 1 MgCl2, 26.2 NaHCO3, 1 NaH2PO4, 22 glucose. You need 800 ml of it. How much KCl do you need to weigh out? Hint: we only care about KCl here. (MW KCl is 74.55 g/mol

Womersley number (a) of a human aorta is 20 and for the rabbit aorta is 17, the blood density is approximately the same across the species. The values of viscosity were 0.0035 Ns/m² for the human and 0.0040 Ns/m² for the rabbit. The diameter of the aorta is 2.0 cm for the man, and 0.7 cm for the rabbit, estimate the heart rate beats per minute (bpm) for both species.

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Drug Concentration A pharmaceutical companyclaims that the concentration of a drug in a patient’sbloodstream will be at least 10% for 8 hours. Supposeclinical tests show that the concentration of a drug (aspercent) t hours after injection is given byC(t) = 200t/2t2 + 32During what time period is the concentration at least10%? Is the company’s claim supported by the evidence?

please make sure to enter the correct scientific notation

Calculate 2NaHCO3 = Na2O + 2CO2 + H20 (Show work please!)Mass of empty evaporating dish: 46.233gMass of evaporating dish + sodium bicarbonate: 48.230gMass of evaporating dish + product after 1st drying: 47.504 gMass of evaporating dish: 46.233gMass of evaporating dish + product after 2nd drying: 47.485   use the data to solve the equation!   balance the equation

D²1 Quizzes - Spring 2023 SPE XQ Ch 12-14, 18 Public speakin x с app.101edu.co < + 1 Ch 12-14, 18 Public speakin x + Balance the following chemical equation (if necessary): V₂O(s) + HCl(aq) → VOCI (s) + H₂O(1) 2 04- Reset 0 ♡ 2 3 VOCI ( ) 4 D2L Quiz 10-12 - Spring 2023 C X Time's Up! H₂O □ 5 n 0₂ ☐3 04 05 06 л O) 6 + 2+ 7 07 V.O. 2 5 ल = (s) (1) y google - Yahoo Search Rest X ³+ 4+ 8 9 ☐8 • x H₂O 0 (g) (aq) HCI 口。 Delete Aktiv Chemistry G + Update: Submit

Need help with part b please

→ C app.101edu.co STARTING AMOUNT esc 1 X 2 F2 CO #m 3 1 The average adult human burns 2.00 × 10³ kcal per day in energy. What is this rate in kJ per hour ? J ADD FACTOR * ( ) X 4184 F4 $ 4 cal 0 349 2.00 × 10³ F5 % 5 kJ Question 26 of 35 O 1000 2.01 x 10⁰ min M 6 31 = 0.001 F7 ANSWER 24 kcal/day O & 7 1.15 x 105 20.0 C F8 S 8 RESET 2 4.184 F9 kcal X 9 F10 60 hr F F11 8 Jan 21 F1Z2 3:17 6 delete Submit + backspac

00 P and Hei 3. Considering the techniques and instrumentation used to perform these experiments, identify 2 potential sources of error if you were to repeat this experiment in the "real world". Human error is not an acceptable answer. Discuss at least two possible sources of error that could contribute to your percent error. 4. A student is performing Reaction 2 and does not completely dissolve the NaOH pellets before acquiring the final temperature. How will this affect his value for AH, and his percent error calculations?

S Physical Science: Q2: 2021-22 (L X S Abigail Spencer | Physical Scienc x MAlg. 1-ldentifying Linear Functior x A alleneast schoolsplp.com/enrollments/172020834/items/7ab47cea-18be-4119-95c8-3ab6b5397059/work Abigail Spencer Next Activity > Physical Science: Q2: 2021-22 (LL): Mastery Assess It 4 All changes saved A 17. You leave a half-full water bottle in the car in the heat of summer. The next time you get in the car, you notice condensation inside the water bottle. This is an example of O synthesis O chemical equilibrium O physical equilibrium an open system > N PREVIOUS 17 of 25 NEXT REVIEW SAVE & EXIT DELL %24 & 林 W

change in enthalpy

Provided Data Time Temperature CHM 131A Lab 9 (min) (°C) Temperature of boiling water 100 25.4 0 -40 Initial temperature of water 32.5 1 44.9 2 Temperature change (AT) 56.9 3 71.3 Mass of beaker 99.233 4 86.6 5 Mass of beaker and water 226.31 g 100.2 6 100.6 7 Mass of water 100.6 8 9 100.6 I

Distinguish between physical and chemical properties and changes (§1.1) (SPs 1.1, 1.2) (EPs 1.1, 1.3–1.6)

OSHA's Hazard Communication Standard requires chemical manufacturers to evaluate hazards relating to their products and provide a Safety Data Sheet in accordance to the Globally Harmonized System (GHS) in which the use of pictograms (see Figure 1) is required to communicate hazard information. Predict (with reasons) two (2) hazards related to each of the two activities below, and assign two (2) relevant pictograms listed in Figure 1 to each of the two activities. Activity 1: Removing diethyl ether (last opened in 2019) using a rotary evaporator. Activity 2: Using carbon monoxide gas as a reducing agent to reduce iron chloride. Figure 1. Pictograms advised by the Globally Harmonized System for communication of chemical hazards.