Chemistry 1032 Midterm 2 Exam

Which of the following are typically studied in chemistry? Select the correct answer below: Organisms Cells Atoms and molecules Quarks - Correct Answer-Atoms and molecules Why is dirt or grease easier to wash off when using soap and hot water than when rinsing with cold water? Select the correct answer below: Soap is a surfactant. Higher water temperature leads to an increased solubility. both A and B none of the above - Correct Answer-Higher water temperature leads to an increased solubility. What is a hypothesis? Select the correct answer below: A statement that summarizes a vast number of experimental observations A comprehensive, testable explanation of particular aspects of nature An act of noticing an event A tentative explanation of observations that acts as a guide for gathering and checking information - Correct Answer-A tentative explanation of observations that acts as a guide for gathering and checking information What factor does the prefix "micro" indicate? Select the correct answer below: 10−6 10−3 10−9 10−12 - Correct Answer-10−6 Which unit is used to measure length? Select the correct answer below: liters kilograms meters seconds - Correct Answer-meters What is the lowest possible temperature on the Kelvin temperature scale? Select the correct answer below: −100 0 −1000 −273 - Correct Answer-0 Write the measurement 0.00860km in scientific notation using the correct amount of significant figures. Select the correct answer below: 8.6×10−3km 8.60×10−3km 8.600×10−3km 8.6000×10−3km - Correct Answer-8.60×10−3km What is the result of 1.0−0.093, including correct significant figures? Select the correct answer below: 0.91 0.907 0.9 0.09 - Correct Answer-0.9 There are about 3.6×107 worms in a pond. Write the number of worms in standard notation. - Correct Answer- If 1in.=2.54cm, how many centimeters are in 6.11in.? Select the correct answer below: 2.54cm 15.5cm 0.416cm 2.41cm - Correct Answer-15.5cm The density of silver is 10.5g/cm3. The density of olive oil is 0.92g/cm3. What will happen when a piece of silver is placed in olive oil? Select the correct answer below: The silver will sink because it is less dense than olive oil. The silver will float because it is less dense than olive oil. The silver will sink because it is more dense than olive oil. The silver will float because it is more dense than olive oil. - Correct Answer-The silver will sink because it is more dense than olive oil.