Week 1 Litmus paper is used to test for Metals Acidity Salt content Oxygen levels 2. An educated guess based on data gathered before an experiment is A skill A conclusion A hypothesis An observation

3. The group that experiences no change of the independent variable is the Variable group c. Control Group Experimental group d. Independent Group 4. Which of the following is the primary purpose of the experimental group? To test the hypothesis by changing one variable To indicate error in the experiment. To gauge the validity of data taken in an experiment To generate ideas for future experiments.

5. Select the best way for the students to reduce the experimental error in their investigation. Test more than one variable at a time Perform repeated trials Change their answers if they do not match their hypothesis Perform the experiment only one time 6. Choose the equipment that would be used to measure the mass of a sample of sodium chloride. Balance c. Beaker Graduated cylinder d. Meter Stick

7. Which has specific markings for measurement and is used to accurately measure liquid volume? Test tube C. Ruler Beaker D. Graduated Cylinder 8. The mass of an object divided by its volume, or stated another way, the amount of matter packed into a given space is its Density C. Mass Volume D. Weight

9. The International System of Units (SI) standardizes measurement units, enabling scientists from all over the world to communicate their results in common metric units. Which of the following correctly identifies the metric base units for length, mass, time, and temperature? meter, kilogram, second, Kelvin kilometer, kilogram, second, Kelvin meter, kilogram, second, Celsius meter, gram, second, Kelvin

10. Choose the answer that correctly organizes four metric prefixes from highest to lowest. kilometer, hectometer, dekameter, decimeter kilometer, decimeter, dekameter, centimeter kilometer, hectometer, centimeter, decimeter kilometer, decimeter, millimeter, centimeter