Transcript Standard 1
Standard #1 Select appropriate lab glassware, balances, time measuring equipment and optical instruments to conduct an experiment The SI System The SI system is the metric system. SI stands for System International since it is used all over the world Length is measured in METERS Weight or mass is measured in GRAMS Volume is measured in LITERS Temperature is measured in Celcius Length Measurement Length is measured in meters or parts of a meter 1 meter is a little linger than a yard stick Weight Measurement We weigh things on an balance or scale Appropriate Measuring Equipment for Science Labs Volume is the amount of space a liquid or object takes up Beakers Flasks Graduated Cylinders Beakers are better for measuring large amounts of liquid. They do not give a very precise measurement. Looking at this beaker you can see that it would be hard to measure accurately measure 150 mL because there isn’t a line there. Graduated Cylinders are good for accurately measuring small amounts of liquid. You can see that there are lines for each mL It is easy to tell 10mL form 30 mL Flasks are used to measure & stir hot/boiling or dangerous chemicals. The small opening or neck cuts down on splashes that could burn you or damage your skin. Measuring The Volume of an Object If you put 40ml of water in a graduated cylinder & then drop a marble in it, the level of the water will go up. The number of mL that the volume goes up is equal to the volume of the marble. Water line Is at 40mL Marble is put in the cylinder marble Water is now at 50mL so the volume of the marble is 10mL Petri Dishes These are used to grow bacteria. Nutrient AGAR ( jelly like stuff that bacterial grows in) is put in the bottom of the dish The red stuff is the agar This petri dish has bacteria growing in it. Hand Lens & Microscopes We use a hand lens (magnifying glass) to see things that are small easier. Microscopes are used to see & measure things that are too small to see with just your eyes or even with a hand lens Types of Microscopes Compound Microscope – uses light to see through something Good things Bad Things – you can see living things you can see things in color you can’t see extremely tiny things Electron Microscope- uses electron beam to see something Good things – you can see extremely tiny things Bad things – the electron beam kills the creature the image is not in color Stop Watch A Stop watch is used to record accurate time in a science experiment just like it is in a track meet.