Count the significant digits in each of these measurements: measurement 0.003600 J number of significant digits -2 - 8.0 x 10 kJ/mol 51800. kg 9.9 x 10 -1 mL G

Length is measured with a metric ruler. Part ofa combined metric and inch ruler is shown in Figure B. On the metric side of the ruler the distance between numbered Hines is equal to one centimeler. Bach centimeter is divided into 10 equal parts. Each one of these parts is equal to one millimeter. The figure below shows a combined metric and inch ruler. 12 ENCHES Figure B 1. What value does the prefix milli- stand for? 2. What value does the prefix centi- stand for? 3. Which is larger, a meter or a millimeter? 4. How many millimeters make 1 centimeter? 5. The length at A may be written as 45 mm. It may also be written as 5 cm, 45 cm, 4.5 mm 6. The length at B may be written as mm or cm. Measure each of the following lengths. Write the lengths on the right in centimeters and millimeters. 7. 7. mm 8. 8. cm mm 9. 9. cm mm 10. 10. mm To the right of each length listed, draw a line of that length. a) 92 mm b) 9.2 cm ) 43 mm d) 3.5 cm

Done < AA www-awu.aleks.com MEASUREMENT Multiplication and division of... Decide whether each proposed multiplication or division of measurements is possible. If it is possible, v last column of the table. proposed multiplication or division Is this possible? result x10 (2.0 mg) - (0.020 g) = ? yes ola no Ar yes (4.0 g) · (6.0 mL) = ? no yes (2.4 em) · (0.30 m) = ? %3D no Explanation Check © 2021 McGraw-Hill Education. All Rights Reserved.

A 13.6 mL sample of polystyrene used in a styrofoam cup weighs 0.222 g What is the density of polystyrene?

Washington, D.C. has an average January temperature of 34.9 degrees Fahrenheit. What is this average if temp is expressed in Celsius? (Round to two decimal places.) [Hint: Conversion between Fahrenheit and Celsius is a linear transformation: Fahrenheit = Celsius*1.80 + 32, or Celsius = Fahrenheit*(1/1.80) - (32/1.80)]

Perform the following calculation: (-0.00030-c xem x 27.5°C) + 1.0042 °C xcm3 What is the answer to the calculation above with the correct units and significant figures? O 1.0- cm3 0.9960 cm3 0.99600- cm3 0.996- cm3

What is the boiling point of the unknown substance Xin K(Kelvin)? X(t) = X(g) AH-(kJ mol1) S°J mol1K1) X(g) -82.0 238 | X({) | -101 144 Express your answer in decimal notation rounded to three significant figures.

Unit Conversion: 3.05 × 10−1 s to ms

The solubility of BaSO, in water at 25 °C is measured to be 0.0023 Use this information to calculate Ke, for BaS04. L sp Round your answer to 2 significant digits. |x10

To identify a liquid substance, a student determined itsdensity. Using a graduated cylinder, she measured out a 45-mLsample of the substance. She then measured the mass of thesample, finding that it weighed 38.5 g. She knew that the substancehad to be either isopropyl alcohol 1density 0.785 g>mL2or toluene 1density 0.866 g>mL2. What are the calculated densityand the probable identity of the substance?