Recitation 1-20-22

.docx

School

Tuskegee University *

*We aren’t endorsed by this school

Course

ISTRY 231

Subject

Chemistry

Date

Dec 6, 2023

Type

docx

Pages

6

Uploaded by AmbassadorDragonMaster972

Report
CHEM 231 GENERAL CHEMISTRY RUSSELL A.E. CHEM 231.01/231/02 RECITATION PERIOD QUESTIONS 1-20-22 1. Classify each of the following changes as physical or chemical: (a) condensation of steam (Physical) (b) burning of gasoline (Chemical) (c) souring of milk (Chemical) (d) dissolving of sugar in water (Physical) (e) melting of gold (Physical) 2. A 2.0-liter volume of hydrogen gas combined with 1.0 liter of oxygen gas to produce 2.0 liters of water vapor. Does oxygen undergo a chemical or physical change? 2H2 + O2 2H2O (Chemical) 3. Indicate the SI base units or derived units that are appropriate for the following measurements(meters (length), mass (grams), time(second), Temp(kelvin), electric current(amp), amount of substance(mole), and luminous intensity (candela) ) (a) the length of a marathon race (26 miles 385 yards) 385yds x 1m/1.09yds = 353.2 m (b) the mass of an automobile Grams “kilo”(kg) (c) the volume of a swimming pool Derived (meters)^3 (lxwxh) (cm^3 or L or mL) (d) the speed of an airplane Derived (distance/time) (meters/second) (e) the density of gold Derived (mass/volume) (grams/cm^3, g/mL or kg/m^3)
CHEM 231 GENERAL CHEMISTRY RUSSELL A.E. (f) the area of a football field (l x w =m^2) 4. Give the name of the prefix and the quantity indicated by the following symbols that are used with SI base units. (a) c (centi) (10^-2) (b) d (deci) (10^-1) (c) G (giga) (10^9) (d) k (kilo) (10^3) (e) m (milli) (10^-3) (f) n (nano) (10^-9) (g) p (pico) (10^-12) (h) T (Tera) (10^12) 5. A large piece of jewelry has a mass of 132.6 g. A graduated cylinder initially contains 48.6 mL water. When the jewelry is submerged in the graduated cylinder, the total volume increases to 61.2 mL. Volume = 61.2 – 48.6 = 12.6mL Density = 132.6g/12.6mL = 10.5 g/mL Gold 40.53g 6. Indicate whether each of the following can be determined exactly or must be measured with some degree of uncertainty: (a) the number of seconds in an hour (b) the number of pages in this book (c) the number of grams in your weight (d) the number of grams in 3 kilograms (e) the volume of water you drink in one day (f) the distance from San Francisco to Kansas City 7. How many significant figures are contained in each of the following measurements?
CHEM 231 GENERAL CHEMISTRY RUSSELL A.E. (a) 53 cm 2sf (b) 2.05 × 10 8 m 3sf (c) 86,002 J 5sf (d) 9.740 × 10 4 m/s 4sf (e) 10.0613 m 3 6sf (f) 0.17 g/mL (g) 0.88400 s 8. Perform the following calculations and report each answer with the correct number of significant figures. (a) 628 × 342 (b) (5.63 × 10 2 ) × (7.4 × 10 3 ) (c) 28.013.483 (d) 8119 × 0.000023 (e) 14.98 + 27,340 + 84.7593 (f) 42.7 + 0.259 9. Consider the results of the archery contest shown in this figure. Accuracy – closeness to a standard value Precision – closeness of measurements to each other (a) Which archer is most precise? Archer X (b) Which archer is most accurate? Archer W (c) Who is both least precise and least accurate? Archer Y
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help
Recommended textbooks for you
Text book image
Chemistry for Today: General, Organic, and Bioche...
Chemistry
ISBN:9781305960060
Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher:Cengage Learning
Text book image
Introductory Chemistry For Today
Chemistry
ISBN:9781285644561
Author:Seager
Publisher:Cengage
Text book image
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Text book image
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Text book image
Introductory Chemistry: An Active Learning Approa...
Chemistry
ISBN:9781305079250
Author:Mark S. Cracolice, Ed Peters
Publisher:Cengage Learning
Text book image
Chemistry for Engineering Students
Chemistry
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Cengage Learning
SEE MORE TEXTBOOKS
Recommended textbooks for you
Text book image
Chemistry for Today: General, Organic, and Bioche...
Chemistry
ISBN:9781305960060
Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher:Cengage Learning
Text book image
Introductory Chemistry For Today
Chemistry
ISBN:9781285644561
Author:Seager
Publisher:Cengage
Text book image
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Text book image
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Text book image
Introductory Chemistry: An Active Learning Approa...
Chemistry
ISBN:9781305079250
Author:Mark S. Cracolice, Ed Peters
Publisher:Cengage Learning
Text book image
Chemistry for Engineering Students
Chemistry
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Cengage Learning
SEE MORE TEXTBOOKS