An electrolytic cell is constructed using platinum electrodes in an aqueous NaHCO3 solution. The electrolytic cell is attached to a 9V battery for 2.5 hours, producing 55 mL of H₂(g) at 1.00 atm and 298 K. 2HCO3(aq) + 2e → H₂(g) + 2CO32-(aq) E° = -0.83 V O2(g) + 4CO2(g) + 2H2O(l) + 4e → 4HCO3- (aq) E° = 2.73 V a. Identify the anode reaction, cathode reaction, and cell reaction. Anode: Cathode: Cell: b. Calculate the current running through the cell.

A student determined that the mass of four pennies was 8.7 grams. Use this information to calculate the number of pennies in a box that contains 2.5 pounds of pennies. Rouund your answer to the nearest whole number. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).

Plz answer correctly in 20 minutes plz it's very urgent

a. CsI 3+ Show Hint

Below is a simple set of weights obtained while immersing potato slices in various sugar solutions over 30 minutes. I need help calculating all of this for a 30 min period  a. For each solution, calculate the rate of weight change over this 30-minute period. Show your work in the space below. Once you calculate these rates - fill in the blanks below and then add these answers to your Canvas exam. Write your answer in standard notation and use  3 digits past the decimal point - e.g. 0.005, 0.030. (Note that the last zero in an answer is considered to be a digit). Show your work in the space below.  0.0 M sucrose = _______  _____________ g/min 0.4 M sucrose = _______ ____________ g/min 0.6 M sucrose = ________ ____________ g/min 0.8 M sucrose = ____________________ g/min 1.0 M sucrose = ________   __________ g/min Using the osmosis data in the question above, determine the percent weight change for each sucrose solution and fill in the blanks given below and then add these answers to…

Answer question number 7 on the attached document

Home Insert Draw View A Text Mode Lasso Select Insert Space + 4. When measuring the volume of a liquid, how would sample size (e.g., using a 10 mL graduated cylinder vs. a 100 mL graduated cylinder to measure out 70 mL of a liquid) affect the absolute error and percentage error in the measured values of mass and volume and therefore the density?

Answerr part b

Must answer all questions eslse downvote   A. MULTIPLE CHOICE. Choose the BEST answer. PLEASE HELP ME ANSWER EVERYTHING THANK YOU Q)What is used for heating small amounts of solids at a high temperature?a) Mortar and pestleb) Evaporating dishc) Crucible and coverd) Clay triangleQ)Which of the following is used in separation techniques?a-Rubber policemanb-Graduated cylinderc-Volumetric flaskd-Filter paperQ)Which of the following describes a centrifugate?a-Always clearb-Supernatant liquidc-Discarded via decantation onlyd-Solid particlesQThe inward force that pulls substances towards its center is called .a-Gravitational forceb-Centrifotal shiftc-Continental shiftd-Centrifugal forceQA "slippery floor" is considered a .a-hazardb-riskc-flash pointd-toxicantQ)Mrs. Lily Potter is 24 weeks pregnant. She was exposed to a chemical while making a potion. What is the type of the chemical she should be avoiding?a-neurotoxicantb-asphyxiantc-teratogend-carcinogenQ)Which of the following should be…