Competency 24 Safe and Proper Laboratory Processes

Safety Issues
Teachers should always review this before a science activity…
4 children
for science safety, limit the number of cooperative groups to a manageable number of…
lab safety rules
students should read and sign lab safety contracts to ensure that all students are aware of the…

True or False:

always add acids to water when working with chemicals

slanted and away from you and others
when working with chemicals in a test tube, how should the test tube be?

  1. apron
  2. goggles
  3. gloves

name 3 things students should always wear when working with chemicals
outdated chemicals
follow directions described in the material safety data sheet to properly dispose of…
storage and disposal of chemicals

  • should be stored on wood shelve
  • stored at eye level
  • stored in containers with date, exp. date, safety precautions  for handling
  • separated by reaction type; ex. acid in one place, base in another place
  • waste should be disposed of properly

these are all procedures for the…

Field Investigations

  • do not touch animals or plants without adult permission
  • never reach under rocks or inside of holes
  • wear safety gloves
  • ask adult to pick up litter

are procedures when following…

inspect objects like rocks and leaves before students handle them
an important safety consideration to emphasize before a nature field trip is to…

  • keep hands dry
  • don’t use extension cords
  • do not use recently used electricial devices

are 3 safety procedures for…

safety precautions
students should be instructed;on this for handling live organisms
live animals in the classroom
teachers should educate themselves about the safe and responsible use of…
alternate shelter
this should be provided to animals when potentially harmful chemicals are being used or when school is not in session…
as close to nature as possible
how should the habitat of animals be?
short periods of time
insects, frogs, and fish should be kept for how long?
sight and sound
the two;senses used when conducting science labs
rain gauge
tool used to measure how much rain has fallen
tool used to measure air pressures and predict changes in weather
this device allows for magnification of objects too large for a microscope
fire extinguisher
it is designed to prevent oxygen from reaching a combustible material
pH tester
it is used to test if a chemical is strong enough to dissolve living tissues
dialysis tubing
a device used to stimulate the way materials move in and out of a cell
hand lens
easy to carry on a field trip; makes objects look bigger than they really are
fume hood or goggles
safety device that prevents chemical splash
a tool used to investigate living organisms
petri dish
a shallow round dish used to grow live organisms
spring scale

this type of scale is:

  • measured in newtons
  • used to measure weight up to 20 newtons
  • used to measure fruits and vegetables
  • can be found in grocery stores

balance scale

it is used to measure the mass of an object


graduated cylinders

  • the most;accurate device used for measuring liquid volume
  • holds up to 100 milliliters
  • can be glass or plastic

non-standard tools of measurement

may not be reliable but appropriate

examples include:

  • marbles/paperclips to measure mass
  • body parts to measure length
  • sticks to measure length

standard tools of measurement

they give precise and reliable measurements

examples include:

  • rulers, meter sticks, balance scale, graduated cylinder, clocks, calculators

celcius scale
scientists use this to measure air and liquid temperatures
instruments used for measuring
thermometers, graduated cylinders, beakers, flasks, and balance scales are all…
reading the bottom of the meniscus
the accurate reading of liquid volume in a cylinder can be done by…
beakers or flasks

  • these are basic storage and chemical handling containers
  • marked @ 5-25 ml
  • flatter at the bottom and holds more liquid

tape measures, rulers, yard sticks, centimeter rulers, and meter sticks are all tools use to measure…
the metric system using liter
the basic unit for measuring volume in science is…

  • cubic meter is used to measure a solid such as a box.; the formula is l x w x h
  • liter is used to measure liquid; a graduated cylinder is used

these are 2 ways to measure…


  • symbol is “da”
  • means 10
  • base unit multiple is 10


  • symbol is “m”
  • means thousandth
  • base unit is written as 0.001
  • fraction equivalent is 1/1000


  • means hundredth
  • symbol is “c”
  • base unit multiple is 0.01
  • fraction equivalent is 1/100


  • symbol is “k”
  • means thousand
  • base unit multiple is 1000


  • symbol is “h”
  • means hundred
  • base unit multiple is 100


  • symbol is “d”
  • means tenth
  • base unit multiple is 0.1
  • fraction equivalent is 1/10

use millimeters

for small lengths like finger tips

10 of these = 1 centimeter


  • the amount of matter an object has; example -;a marble has greater of this than a cotton ball
  • not affected by gravity
  • a balance scale is used to measure it


  • use kilograms for large objects like a can of juice or block of cheese
  • use grams to measure small objects liek a coin, marble, pencil, small rock
  • use milligrams to measure very small objects like pebbles

are examples of how to measure…

use liters for liquids like milk or juice to measure…
volume by immersion

  • to measure the volume of a solid object, place the object in a water filled cylinder
  • the;increase in the volume of water is equal to the volume of the irregular shaped object

this is known as…

precise and;accurate
example of all the darts landing close together in a bulls eye would be
precise but not accurate
example of darts landing close together but not close to the bullseye would be…
neither accurate nor precise
an example of darts landing on a target in a very random way with none being close to the bull’s eye would be…
organize data

-concept maps



are used in science to…


  • shows a relationship of one variable to another
  • makes data easy to interpret and analyze

arranges data in order to classify and compare information
concept map

  • type of diagram taht shows how ideas are linked together or related
  • helps organize information about a topic
  • breaks down into smaller parts for easier understanding

line graphs
use in science to plot time and distance

  • a form of prediction that uses high order thinking skills
  • used for quick observations when a precise measurement is not needed

the process in which prior knowledge and observation skills are used to approximate amount or value is known as…
a _____________ is 1 foot or 12 inches
yard stick
a _______________ is 36 inches or 3 feet
use this to find average distances like a desktop or football field…
use this to measure long distances like city to city or place to place
100 degrees celsius
the boiling point of water is
0 degrees celsius
the freezing point of water is…
metric units for small amounts
deci, centi, and milli are…
metric units for large amounts
deca, hecto, and kilo are…
metric system

  • it is the standard measurements that all scientist around the world use and can understand
  • it is convenient because unit sizes vary by multiples of 10

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