Experimental Design

Experimental Design

​Some text here about the topic of discussion.

​laboratory for Chemistry

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"the heart of studying Chemistry is in the lab, without lab, it is void.

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it is same like when I meet you because you will fill the emptiness of my heart"

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​(p.s just get used to it, I need to do this to channel my other strength. hope you don't mind )

​however..before entering lab, you should know the rules

Multiple Choice

The type of variable that responds to the experiment and is what you measure to determine if your hypothesis is true.

• Independent

• Dependent

• Control

Multiple Choice

The type of variable that you change or manipulate in an experiment.  It is what you are testing.

• Independent
• Dependent
• Control

Multiple Choice

The parts of the experiment that must be kept the same.

• control

• independent
• Dependent

Multiple Choice

If you were testing how well different dish soaps cleaned grease, the independent variable would be the:

• amount of grease
• dish soap type
• grease type

​what are the laboratory apparatus we commonly use?

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​temperature = thermometer

​what are the laboratory apparatus we commonly use?

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volume (approx) = beaker or conical flask

​for the conical flask, they are mostly round in shape with a cylindrical neck. These tools are used to hold, measure, and heat substances in science labs. They are made with a thick layer of glass which is ideal since glass is a bad conductor of heat. Hence, the risk of the glassware getting damaged is eliminated. Their long neck helps in keeping the substance safe from spilling out during the chemical reaction process.

​A beaker has a wide and open mouth along with a lip to pour liquid whereas the flask has a neck that is different from the size of its body. It’s smaller in size.

​what are the laboratory apparatus we commonly use?

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volume (exact) = volumetric flask

​volumetric flask has a mark which can indicate exact measurement of volume, such as making exactly 50 cm3 or 100 cm3 or 250 cm3 of solution with high accuracy.

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it has long neck, wider bottom to allow mixture mixes homogenously. ​

​what are the laboratory apparatus we commonly use?

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volume (nearest to 0.5 cm³) = measuring cylinder

​what are the laboratory apparatus we commonly use?

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volume (exact) = volumetric pipette (with bulb filler)

​volumetric pipette is similar to volumetric flask, which can be used to measure exact and accurate amount of volume needed in titration. the accuracy is even higher compared to only using measuring cylinder of the same amount.

​what are the laboratory apparatus we commonly use?

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volume (nearest to 0.05 cm³) = burette

​what are the laboratory apparatus we commonly use?

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mass = balance, unit g or Kg

​what are the laboratory apparatus we commonly use?

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time = analog / digital stopwatch, unit s or min or h

how to measure volume?

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how to measure volume?

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how to measure volume?

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how to measure volume?

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Multiple Choice

what apparatus do you use to measure accurately 25.0 cm³ solution of 0.1 mol dm^-3 hydrochloric acid which is needed for titration experiment?

• beaker glass

• volumetric pipette

• conical flask

Multiple Select

which of the following apparatus below can be used to measure accurate amount of volume of liquid?

• beaker glass

• volumetric pipette

• conical flask

• burette

Multiple Select

The reaction between solution P and solution Q is producing heat.

A student is told to test this statement by mixing equal volumes of the two solutions and measuring the temperature change.

Which two pieces of apparatus should not the student use?

• balance and clock

• balance and thermometer

• pipette and clock

•  pipette and thermometer

Multiple Choice

In an experiment, a student needs to measure out 36.50 cm3 of a solution.

Which piece of apparatus would measure this volume most accurately?

• beaker

• burette

• measuring cylinder

•  pipette

Multiple Choice

A student was provided with only a thermometer, a stopwatch and a beaker. What could the student measure?

• 10.5 g solid and 24.8 cm3 liquid

• 10.5 g solid and 25 °C

• 24.8 cm3 liquid and 45 seconds

• 25 °C and 45 seconds

solute, solvent, solution

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solute, solvent, solution

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saturated solution

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