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Transcript of science presentation(equidment)
- A test tube can have many different sizes.
- A test tube is made by a special glass that can be either heated or cooled without breaking. Resources Cowie, A. (2004). How to Dispose of Hydrochloric Acid. eHow. Retrieve from http://www.ehow.com/how_8419934_dispose-hydrochloric-acid.html
6 October 2007. How do you dispose sodium hydroxide? Answers.com. Retrieve from http://wiki.answers.com/Q/How_do_you_dispose_sodium_hydroxide
Helmenstine, M. , A. (2009, Jan 9). What is Litmus paper? About.com Chemistry. Retrieve from http://chemistry.about.com/b/2009/01/09/what-is-litmus-paper.htm
Helemenstine, M. , A. How to Dispose of Mercury. About.com Chemistry. Retrieve from http://chemistry.about.com/od/metalsalloys/a/how-to-dispose-of-mercury.htm
Skipor, A. (June 2012). Test tube. Newton. Retrieve from http://www.newton.dep.anl.gov/teachers/resources/basiclab/testube.html
Stribling, D. What Does Litmus Paper Test? eHow.com. Retrieve from http://www.ehow.com/facts_5776691_litmus-paper-test_.html
Wikipedia. Graduated cylinder. Retrieve from http://en.wikipedia.org/wiki/Graduated_cylinder
Tikkanen, A. (2009 September 12). Ammeter. Encyclopedia Britannica. Retrieve from http://www.britannica.com/EBchecked/topic/20914/ammeter
Helmenstine, A. Volumetric Flask. About.com Chemistry. Retrieve from http://chemistry.about.com/od/chemistrylab/a/Volumetric-Flask.ht Science Lab Equipment By: David, Jamie, Jessica, Alice, Julie What is lab equipment? Lab equipments are the tools that scientists use to do the experiment in the laboratory. Types of Equipment There are many different types of equipment that scientist used. Each of them has their own function. But all of them mostly perform 3 specific tasks:
3. Mixing Types of Lab Equipment Beaker
Test tube Indicators: litmus paper, universal paper
Ammeter Volumetric Flask Thermometer Erlenmeyer flask Pipet Wire gauze Glass watch Disposal Acids and bases Used? - Contain the chemicals that are harmful for skin.
- Test chemicals reaction from combining or heating. - Water-soluble mixture of different dyes extracted from lichens.
- It is used to test whether a solution is acid or base:
- Turns red when the solution is acidic. (pH < 7)
- Turns blue when the solution is basic. (pH >7)
- Litmus paper can only change color but they can’t determine an exact pH number of a solution. - The pH indicator which determines the strengths of the acids and bases.
- It changes color due to the pH of the substance.
-The colors can tell you how strong the substance is. - It is used to measure the volume of a liquid more accurate than the beakers
- A graduated cylinder is meant to be read with the surface of the liquid at eye level, where the center of the meniscus shows the measurement line.
- Common size of graduated cylinder are between 5ml and 2000 ml. - Pipet is a glass tube that transfer or measure a small amount of liquid.
- There’s a vacuum bulb at one end for drawing liquid in and releasing one drop at a time. - Wire gauze is a small square piece that has a circle in the central.
- The wire gauze is made of synthetic fibers.
- It helps to hold the containers such as beakers during heating.
- It is used with an iron ring and ring stand with a Bunsen burner underneath it. - Glass watch is a concave and slightly piece of glass.
* 3 ways that glass watch can be used:
- Used as a surface to evaporate a liquid.
- Hold a solid during weighing
- Used as a cover for a beaker. - Ammeter is an instrument that measures electric current in amperes.
- It can either measure directly or alternatively.
- It measures how fast the electric passes through metal like: brass , iron. - Beaker is a laboratory tools to heat up liquid or to hold liquid.
How to use it?
1. Pure the water in and look at the line to make sure the right volume.
2. Stir the liquid
3. Heat it up
4. Pour it out. - A volumetric flask is made of glass that is used to prepare for a chemical solution.
- A volumetric flask has a bulb and a long neck.
- Most volumetric flasks have a flattened bottom so that they can be set onto the lab bench easily.
- It allows us to add more different chemical to the solution that we have before and create a new one. - Laboratory equipment that is used for measuring the temperature in liquid or human skin.
How to use?
- Put it into the liquid that you want to measure.
- Hold it, keep it from touching the bottom of the containers that is holding the liquid. It will give us an accurate measurement. - The Erlenmeyer has a narrow top and a triangle shape at the bottom.
- Used to measure, mix and contain liquid for experiment.
- Most Erlenmeyer flasks are made of borosilicate glass so they can be heated over a flame - A bunsen burner produces gas flame for heating the solution.
- It consists a vertical metal tube that connected to a gas fuel source.
- There are holes at the base that allow air to enter and mix with the gas in order to make a very hot flame. Bunsen burner Hydrochloric Acid Sodium hydroxide - To dispose, we need to turn the sodium hydroxide into a neutral:
1. Add some solid weak acid such as citric acid powder.
2. Add bit by bit until the pH is in neutral level.
3. Dispose it down the drain. Fluorescent bulbs and some of the thermometers contain small amounts of mercury. If you break it you should... Mercury