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TAKS 8th Grade Science Review Objective 1

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TAKS 8th Grade Science Review Objective 1

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    1. TAKS 8th Grade Science Review Objective 1 Nature of Science

    2. Lab Safety Safety First! List safety items found in your classroom/laboratory. 1. 2. 3. 4. 5. 6.

    3. Chemical Safety Think “A&W” Rootbeer When a 15% nitric acid solution is heated in an open test tube, the test tube should always be pointed _____ . A so bubbles are visible B at a 180ş angle from the flame C away from nearby students D toward a ventilated area The safest way to dilute concentrated hydrochloric acid or sulfuric acid is to add _____ A a series of small volumes of water to the acid while stirring B the acid to water slowly while stirring constantly C the acid to a small volume of water and then add more water D dilute either acid to a small volume of the concentrated acid

    6. Variables and Control Variables – anything that changes Manipulated (Independent) – scientist changes Respondent (Dependent) – changes as a result of the manipulated variable Control – part of the experiment without the independent or manipulated variable Too many variables make an experiment unreliable! Try to limit the number of manipulated variables.

    9. Graphs Bar Graphs are used to compare results Line Graphs are used to show change over a continuum Circle Graphs are used to show percentages

    10. DRY MIX

    13. Notes for Maps Look for information in the key. Pay attention to directions (North is usually to the top, unless otherwise noted).

    15. Be Careful Always read the questions carefully. Read all of the possible answers. Look for key words in the questions. Look for patterns in data tables.

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