Science Review: Marking Period 1 Exam

1.Safety: Write down 2 safety procedures to follow in the laboratory. Point test away from yourself and everyone else. Wear goggles to protect your eyes. Do not start a lab unless instructed to do so by the teacher. Do not eat or drink anything during a lab.

2. List the 7 steps of the scientific method: Problem Gather information Hypothesis Experiment Observation Conclusion Repeat

3. What is a hypothesis? An educated guess 4. Which step of the scientific method tests the hypothesis? Experiment 5. Which step of the scientific method organizes and analyzes data? Observations

6. Define: a. Independent Variable: The factor that is different in each setup b. Dependent Variable: What is being measured

7. Students wanted to investigate the effect of vinegar on seed growth. In order to test their idea they set up two identical containers filled with soil. In each container they planted 100 bean seeds. Both containers were placed in the sunlight for 8 hours a day. Container A was given 50 ml of water daily and container B was given 50 ml of vinegar. The seed growth was measured weekly. a. Independent Variable: Vinegar b. Dependent Variable: Seed growth c. Control Group: Container A d. Experimental Group: Container B e. 2 constants: Type of seeds, temperature, light, location, containers f. How can you increase the validity of this experiment? Repeat, increase sample size

8. What length is being represented at the arrow in the diagram below? 1.7 cm

9. Calculate the volume of an object with the following dimensions: L = 3.5 cm, W = 4.7 cm, H = 8.3 cm Show all work! V = L x W x H V = 3.5 cm x 4.7 cm x 8.3 cm ( ) V = cm 3

10. What is the volume of the liquid in the graduated cylinder below? 30 mL

11. What is the mass on the triple beam balance below? g

12. What are the temperatures shown below in C and F? 100ºF 38ºC

13. The volume of water in a graduated cylinder is 45ml. 6 marbles are placed into the graduated cylinder and the volume of the water is now 49ml. What is the volume of the marbles? mL

14. What is the boiling point of water? (F & C) 100°C, 212°F 15. What is the freezing point of ice? (F & C) 0°C, 32°F

16. What is the density of an object that has a mass of g and a volume of 134 mL? Show all work! D = m = 67.98g = 0.5 g/mL v 134 mL a. Will this object float or sink in water? Why? It will float because it less dense than water. b. If this object is cut in half what will the density of each half be? The same (0.5 g/mL)

17. What is an atom? Smallest particle of matter

18. Label the subatomic particles of the atom below. ELECTRON NEUTRON PROTON

19. Identify the part of the atom being described: a.Positive charge proton b. Found moving around the nucleus electron c. Negative charge electron d. found in the nucleus Neutrons & protons e. no charge neutrons f. smallest mass electrons

20. The following statements are false. Change the underlined word to make the statement correct. a.In a compound, elements are physically combined. mixture b. In a mixture, substances cannot be separated by physical means. Compound c. A compound cannot be broken down into a simpler substance. element