CHM1020 Week 1

55. Round the number on the left to the number of significant figures indicated by the example in the first row. (Use scientific notation as needed to avoid ambiguity.) Rounded to Rounded to Rounded to 4 Significant 2 Significant 1 Significant Figures Number Figures Figure 1.45815 1.458 1.5 8.32466 84.57225 132.5512

Calculate the correct number of the significant figures:  a.) 1459.3 + 9.77 / 4.32 b.) 0.004 + 0.09879 c.) 2.4 - 1.777 d.) 0.00456 / 1.0936

2) _____________ mL

1.-How many significant figures are in the following numbers? 0.70620 a. b. 5010 4548 C. d. 0.00045050 7.210 x 105 e. 2.-Round up the following numbers to the designated significant figures to 2 significant figure 32445.34 to 1 significant figure 85518 to 4 significant figures 526544 3.-Express each answer in scientific notation and with the proper number of significant figures a. 1,027611 +363.06 = b. 217 903 118.7 2-35.5 C. d. 28 x 47.3= e. (5.2 x 10) x (3.33 x 102) 4.-Convert the following numbers to scientific notation, use prefixes and use only 2 significant figures Example 52,000,000 g 52 X 10 g 52Mg 52 megagrams 0.0000003 g a. b 26198151 L 1546 m C. 5.-What does the slope of each line on the graph tell you? 6.-Which runner finish the race first red, blue or green? TIME (seconds) b) 4x+2-2(x+6) 7.-Solve for X in the following equations: a) 25 554x-4.245 8.-Classify each statement as a law, a theory, an experiment, a hypothesis, an observation Birds evolved from dinosaurs. 1. Hot…

A. Rounding Off A.1 Rounding A student rounded off the following calculator displays to three significant figures. Indicate if the rounded number is correct. If it is incorrect, round off the display value properly. Calculator Student's Correct (yes/no). Corrected (if needed) Display Rounded Value 24.4704 24.5 143.63212 144 532 800 530 0.00858345 0.009 8. 8.00 17

1. Describe how to use conversion factors correctly using an example. 2. Write a number between 1.000 and 9999999.99. Write the number of significant figures in your number. 3. Give an example of how to find significant figures in calculations for A addition or subtraction B. multiplication and division

A. How many significant figures are in each of the following numbers? 1. 1.234 2. 1.2340 3. 1.2340 x 10-3 4. 1.2340 x 10^-3 5. 1234 6. 12340 7. 0.012340 8. 12.34 9. 123.4 10. 1.23400 x 10-5 B. Express the following number in scientific notation with correct significant figure. 1. 900 000 (3SF) 2. 3400 (2SF) 3. 45 (3SF) 4. 0.815 (2SF) 5. 0.00891 (2SF) 6. 4 500 (2SF) 7. 0.00766 (1SF) 8. 56 000 (2SF) 9. 34 000 (3SF) 10.8930 (4SF)

Do the following calculations to the correct number of significant figures: a.) 3.8 x 105-8.45 x 104 b.) 0.004 + 0.09879  c.) 1459.3 + 9.77/ 4.32 d.) 432/7.3-28.523

1. Express the following decimal numbers in scientific notation. Round it off to two decimal places. 0.456700  70.000  3.4500  35600.00  0.00075600

4. Show the answers with appropriate number of significant figures. 39.9 а. 6.022 x1023 b. 0.0021 g + 34.56 g-0.765 g

A. Type the number 1340000 in scientific notation. B. Type the number 0.000354 in scientific notation. C. Type the number 3.14×103 in standard notation.

between significant digits are always significant. figures. Example: 5,007 has 4 significant figures. 3) Trailing zeros in a number are significant only If the number contalns a decimal polnt. Example: 100.0 has 4 significant figures. 100 has 1 significant figure. 4) Zeros in the beginning of a number whose only function Is to place the decimal polnt are not significant. Example: 0.0025 has 2 significant figures. 5) Zeros following a decimal significant figure are significant. Example: 0.000470 has 3 significant figures. 0.47000 has 5 signlficant figures. Determine the number of significant figures in the following numbers. 1. 0.02 6. 5,000. 4. 2. 0.020 2. 7. 6,051.006 3. 501 3 8. 0.0005 1. 4. 501.0 9. 0.1020 5. 5,000 10. 10,001 5 Determine the location of the last significant place value by placing a bar over the digit. Example: 1.700) 9,010.0 4.7x10-8 10,8 00,000 3.0Tx 1021 0.00410 1. 8040 6. 90,100 0.0300 699.5 2,000X162 0.90100 2. 0.0300 7. 4.7 x 108 3. 699.5 8. 10,800,000. 3.…

Complete the following using significant digits rules. Report your answers using the correct number of significant digits. A.) 0.368 + 12.24 - 6.742 B.) (30.86) x (15.667) x (0.28) C.) (1600 ÷ 2.24) + 1.185 D.) (1260 + 42.35) ÷ 6

3.-Express each answer in scientific notation and with the proper number of significant figures 1,027 611363.06 a. b. 217 903 118.7:2-35.5 = C. d. 28 x 47.3= e. (5.2 x 10) x (3.33 x 10 2)

General Chemistry Laboratory I Lab 1 Significant Figures and Dimensional Analysis Student name PRE-LABORATORY QUESTIONS 1. How many significant figures are in each measurement? (1) 0.0044500 m (2) 5.003 km (4) 1.00 x 10³ s (5) 0.002 mm 2. Define accuracy and precision. 3. Convert 1.567 kilometers to centimeters.ccurate d 4. Convert 3.70 milligrams to kilograms. O Date: Page 1 IN-LABORATORY WORKSHEET 1. Give the number of significant figures in each of the following numbers. (1) 1,278.50 (2) 120,000 (4) 0.0053567 (5) 670 (7) 8.002 (8) 823.012 (10) 2.60 (Prepared by W. Song) (3) 10 dm (6) 10,000 m (3) 90,027.00 (6) 0.00730 (9) 0005789

The number 8.588682 rounded to 2 significant figures is: The number 701.9951 rounded to 3 significant figures is: The number 32.63733 rounded to 5 significant figures is:

I. How many significant figures does each number contain? 1 ]  0.00 2]  160 3]   0.00160 4 ] 1,600,000 5]  1.06   II. Round off each number to three significant figures. 1]  25,401 2]  1,248,486 3]  123456 4]  371 5]  0.012695982 III. Write each quantity in scientific notation. 1]  1,234 g 2]  44,000 km 3]  0.000162 m 4]  5,244,000 L 6]  4,440 s   III. Convert each number to its standard form. 1]  4 x 10⁸ 2]  3 x 10² 3]  822 x 10⁻⁵ 4]  0.2 x 10¹0 5]  200 x 10⁻⁷

2

The number 1.00430 has ________ significant figures.

2.-Round up the following numbers to the designated significant figures to 2 significant figure 32445.34 to 1 significant figure 85518 to 4 significant figures 526544

Do the following calculations to the correct number of significant figures: MUST follow the rules of SIGNIFICANT figures  a.) 432/7.3-28.523 b.) 0.004 + 0.09879 c.)87.6 + 9.888 +2.3 + 100.77 d.) 5.01 x 105/7.8 x 102

3. What is the correct volume in each of these containers with appropriate significant figures? -33 -333 -32 -332

The number 0.0007270 is larger than the number 5.7 × 10-³.     a. true b. false

QUESTION 9 In which of the following pairs of numbers does each member of the pair contain the same number of significant figures? Oa. 70.50 and 10960 Ob. 0.0806 and 960,000 C. 0.03070 and 0.0670 С. Od. 20.006 and 462

ndiur 4.S 3. Express 9.7001 x 103 as an ordinary decimal number with the correct number of significant figures. a. 0.009701 b. 97001 c. 0.0097001 d. 970 e. 0.0097

1. Calculate the mass of sugar weighed out.  a. Circle one: When performing the above calculation, significant figures / decimal places are the primary consideration.

What is 16.7 cubic feet expressed in cubic centimeters?  ( 1 in = 2.54 cm)     _______[a]_______cm3  PLEASE HELP!!!!!!!!!!!