Chem Ch.2 QUIZ

In an experiment, onion plants of different ages were exposed to various amounts of caffeine to determine the effect of caffeine on cell growth. Temperature, amount of water, the light were kept constant. Which of these statements about the experiment is definitely true?

• The results may not be valid because there were two variables.
• The amount of caffeine used was a control.
• Temperature, water, and light were the only variables.
• Onion plants can be used to model the effects of caffeine on living things.

Which of the is the variable in the experiment designed to determine whether steel rusts more quickly near a lake or in a desert in one year?

• The amount of rust
• Time of exposure
• The amount of water in the air
• Mass of the steel

Which of these terms best describes the following statement? " A solution of the unknown compound turned litmus paper blue."

• Hypothesis
• Model
• Quantitative observation
• Qualitative observation

Theories are considered successful only if they:

• Can be used to make accurate predictions.
• Can be stated in simple terms.
• Can be written in the form of an equation.
• Have been accepted by all scientist.

The unit cm^3 is used to express:

• Length
• Mass
• Volume
• Time

The SI base unit for time and temperature are:

• Hour and degrees Celsius
• Second and degree Celsius
• Hour and Kelvin
• Second and Kelvin

Which of these shows SI unit prefixes arranged in order from smallest to largest?

• Centi, Milli, Kilo
• Milli, Centi, Kilo
• Kilo, Milli, Centi
• Kilo, Centi, Milli

The conversion factor 1L/10^3 mL would be used to change:

• Milliliters to liters
• Liters to milliliters
• Units of volume to units of length
• Units of length to units of volume

If the volume is 5 mL, what is the density?

• 5

• 25

• 100

• 50

A sample of bismuth has a mass of 343g and a volume of 35.0 cm^3 What is the density of bismuth?

• 0.102 g/cm^3
• 9.80 g/cm^3
• 378 g/cm^3
• 1.2 x 10^4 g/cm^3