Question

Student name: Student ID#: Give the best answer for each of the following questions, Choose only ONE answer for each question and write clearly 1), the identities of the substances involved are the same as their identities before the change a-Physical change b-Chemical change - State of matter d-Mixture 2) This kind of separation is based on the state of matter and it is used to separate a heterogeneous mixture like coffee a- Filtration b-distillation C-cooking d-extraction 3) Which of these is an extensive property a-mass b-the color c-melting point d-boiling point 4) The normal body temperature in SI unit is a-37°C b-310K C-98.6°F d-37 5) The nutritional Calorie unit to measure Energy. That one nutritional Calorie equals a- 10 Cal b-1000 cal c-4.184 ) d- 100 cal 6) When it refers to how closely individual measurements agree with the correct, or "true," value a- Accuracy b- Precision C-Density d-Significant figures 7) 0.0054622137 round it to five significant figures and express the result in standard exponential notation: a-5.462237x10 b-5.462237x10 c-5.4622x102 d-5.4623x10 8) Glassware for Measuring Volume in chemistry labis a- Pipette b-Volumetric flask d-All above C-Syringe

Answer 1

1. Physical change

2. a. Filtration

3. a. mass

4.b. 310 K

5. b. 1000 cal

6. a. Accuracy

7. 5.4622 * 10^-3

8. d. all of these