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Chemistry Presentation. Standards 9a and 9b Experimentation. Standard 9a and 9b. Plan and conduct a scientific Investigation to test a hypothesis. Evaluate the accuracy and reproducibility of data. What does the word hypothesis mean?. Hypothesis is an educated guess.

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Chemistry presentation

Chemistry Presentation

Standards 9a and 9b

Experimentation


Standard 9a and 9b

Standard 9a and 9b

  • Plan and conduct a scientific Investigation to test a hypothesis.

  • Evaluate the accuracy and reproducibility of data


What does the word hypothesis mean

What does the word hypothesis mean?

  • Hypothesis is an educated guess.

  • It has to be something you can test not just an opinion

  • Example: Cold water freezes faster than hot water.


There are 3 types of variables in an experiment

There are 3 types of variables in an experiment.

  • Control variable: variables that are kept the same throughout the whole experiment.

  • Independent variable: Also called the experimental variable or manipulated variable. It is the thing the scientist is changing.

  • Dependent variable: what the scientist is measuring. It responds to what is being done with the experimental variable.


A good experiment only tests 1 variable at a time

A good experiment only tests 1 variable at a time

  • It‚Äôs important to test 1 variable at a time so you know exactly what is causing your results.


Doing an experiment more than once is good

Doing an experiment more than once is good.

  • Experiments need to have reliable data so that good conclusions can be made.

  • Reproducibility is when you repeat an experiment or measurement the same way you get the same answer.

  • Multiple trials help ensure reproducibility because errors can be seen more easily.


Your turn read the following procedure carefully

Your turn: Read the Following procedure carefully

  • EXPERIMENTAL PROCEDURE

  • Fill 3 containers with 300 milliliters of cold tap water.

  • 2. Add 10 grams of salt to container 1; stir. Add 20 grams of salt to Container 2; stir. Add no salt to container 3.

  • Place the 3 containers in a freezer.

  • Check the containers every 15 minutes. Record your observations.


What is the experimental variable

What is the experimental variable?

  • EXPERIMENTAL PROCEDURE

  • Fill 3 containers with 300 milliliters of cold tap water.

  • 2. Add 10 grams of salt to container 1; stir. Add 20 grams of salt to Container 2; stir. Add no salt to container 3.

  • Place the 3 containers in a freezer.

  • Check the containers every 15 minutes. Record your observations.


What is probably the dependent variable

What is probably the dependent variable?

  • EXPERIMENTAL PROCEDURE

  • Fill 3 containers with 300 milliliters of cold tap water.

  • Add 10 grams of salt to container 1; stir. Add 20 grams of salt to Container 2; stir. Add no salt to container 3.

  • Place the 3 containers in a freezer.

  • Check the containers every 15 minutes. Record your observations.


What is a control variable

What is a control variable?

  • EXPERIMENTAL PROCEDURE

  • Fill 3 containers with 300 milliliters of cold tap water.

  • Add 10 grams of salt to container 1; stir. Add 20 grams of salt to Container 2; stir. Add no salt to container 3.

  • Place the 3 containers in a freezer.

  • Check the containers every 15 minutes. Record your observations.


What is a possible hypothesis

What is a possible hypothesis?

  • EXPERIMENTAL PROCEDURE

  • Fill 3 containers with 300 milliliters of cold tap water.

  • Add 10 grams of salt to container 1; stir. Add 20 grams of salt to Container 2; stir. Add no salt to container 3.

  • Place the 3 containers in a freezer.

  • Check the containers every 15 minutes. Record your observations.


Where is there a possible error

Where is there a possible error?

Freezing Time Results

Trial 1Trial 2

  • 10 grams 10 minutes 13 minutes

  • 20 grams 13minutes 13 minutes

  • No salt 8 minutes8 minutes


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