Science Quiz #2 Study Guide

By: Brooke Luckman Per. 2

Safety Handout

  • Nurse extension is 2828
  • Hot glass and cold glass look the same
  • Always waft liquid chemicals (NEVER solids/powders)
  • Do not look down into a test tube while being heated
  • Never use force to remove or insert glass

Reaction in a Bag

  • Phenol red is used as a ph indicator (Below 7 on ph scale turns yellow and about 8 turns pink)
  • Calcium Chloride (calcium and chloride) used to keep things fresh, electrolytes, and salty flavor
  • Sodium bicarbonate (baking soda) not acidic, used in baking, toothpaste, laundry detergent
  • When A is mixed with red or water it creates an exothermic reaction (a chemical reaction accompanied by the evolution of heat)

Heating Baking Soda

  • In the inverted bottle the water decreases
  • The gas comes from the baking soda heated with the air in the test tube
  • The droplets in the test tube also came from the baking soda
  • The heated tea test tube is not the same as the non heated test tube because the color is different which means they are two different substances.
  • The control group: unheated baking soda/tea
  • Experimental group: heated baking soda/tea
  • Independent variable: something that will cause a change in the dependent (the temperature)
  • Dependent variable: the tea color
  • Control factors: things that we can control (Using the same amount of tea/baking soda; same type of tea; same size test tube; same amount of stirring time)
  • There is less or the same condensation as baking soda because the condensation comes from the baking soda, so it cannot produce more than itself
Lab 1.1 Heating Baking Soda


  • Unit of measure: cm3 (cubic centimeters)
  • Volume Formula: LxWxH
  • Standard unit of length: meter (m)
  • 1cm = .01 m 100cm=1m
  • Unit cube: a small cube 1cm on each edge one cubic centimeter=1 cm3
  • Always use a grad. cylinder to measure
  • Unit: milliliters (mL) or cm3
  • 1mL = 1cm3

Single Pan Balance

  • Check that pan is clean and dry
  • Always "zero" balance before each massing
  • Push all riders to zero (left) and use adjustment knob if needed
  • NEVER switch pans
  • Pick up balance by red bar only
  • DON'T zero balance when done


  • Always estimate to one decimal place more than your given
  • The advantages of a graduated cylinder being narrow and tall is that the lines are further apart because there's more depth due to lack of surface (easier to read)
  • On a cone shaped graduated the divisions are not equally spaced because as the surface increases the depth decreases.