Variables and Controls
➤ To test something, it is better to use methods that are fair and unbiased so the result are not influenced by personal preferences.
➤ For the experiment used in the article, first we label and weigh three identical, heat-resistant jars. Second, we sure 100 ml of each drink into the appropriate jar. Third, we set the jars on a hot plate and heat the drinks being careful not to burn the dry material that remains, we remove each jar when all the liquid has boiled away. Fourth, we let the jars cool into room temperature and weigh each jar.
➤The formula to find the mass of the dry material is: total mass - the mass of the empty jar
➤ Scientists pay close attention to controls, dependent variables, and independent variables when they design experiments.
➤ Scientists take great care to make sure the only factor in the experiment, the independent variable, is changed.
➤ The factor that changes as a result of independent variable is called the dependent variable.
➤ Controls are factors that are kept the same, providing a basis for comparison.
1. Pour the same amount of water into two breakers.
2. Take the temperature of the water in each breaker to make sure the temperatures are the same.
3. Add salt to one breaker and stir the water in both breaker until all the salt has dissolved.
4. Take the temperature of the water and of the salt solution.
5. how did dissolving salt in one breaker affect the water temperature?
Dissolving salt in one beaker changes the water temperature, it makes it drop.
6. What were the controls? Variables?
Controls: Water and breakers.
Independent Variable: Salt
Dependent Variable: Temperature
➤ For the experiment used in the article, first we label and weigh three identical, heat-resistant jars. Second, we sure 100 ml of each drink into the appropriate jar. Third, we set the jars on a hot plate and heat the drinks being careful not to burn the dry material that remains, we remove each jar when all the liquid has boiled away. Fourth, we let the jars cool into room temperature and weigh each jar.
➤The formula to find the mass of the dry material is: total mass - the mass of the empty jar
➤ Scientists pay close attention to controls, dependent variables, and independent variables when they design experiments.
➤ Scientists take great care to make sure the only factor in the experiment, the independent variable, is changed.
➤ The factor that changes as a result of independent variable is called the dependent variable.
➤ Controls are factors that are kept the same, providing a basis for comparison.
1. Pour the same amount of water into two breakers.
2. Take the temperature of the water in each breaker to make sure the temperatures are the same.
3. Add salt to one breaker and stir the water in both breaker until all the salt has dissolved.
4. Take the temperature of the water and of the salt solution.
5. how did dissolving salt in one breaker affect the water temperature?
Dissolving salt in one beaker changes the water temperature, it makes it drop.
6. What were the controls? Variables?
Controls: Water and breakers.
Independent Variable: Salt
Dependent Variable: Temperature
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