8th Grade Science- UddoPractice Questions for exam

1.) Which diagram best represents molecules of matter in the solid phase?

Base your answers to questions 2 - 4 on the diagram below and your knowledge of science. The diagram shows two students ready to dive into a pool.

2.) Explain why student B has more potential energy than student A

3.) Student A drives from the board into the water. Explain why student A’s kinetic energy decreases as the student enters the water.

4.) Where is the kinetic energy of each student the greatest?

The diagram below shows a rock being placed in a graduated cylinder containing water.

5.) What property does this tool measure? 6.) What value would be given to this rock? (Give proper units)7.) The mass of the rock is 0.03 kilograms. How many grams is this rock?

8.) Using your converted mass from question 7, what is the density of the rock? (Give proper units)

9.) Create a graph of the following data

10.)When calcium carbonate (CaCO3) is heated, it decomposes to form calcium oxide (CaO) and carbon dioxide (CO2). The equation below shows this reaction.

CaCO3 CaO + CO2

In this reaction, the mass of CaCO3

a. Is less than the mass of CaO plus the mass of CO2

b. Is greater than the mass of CaO plus the mass of CO2

c. Equals the mass of CaO plus the mass of CO2

d. Equals the mass of CaO minus the mass of CO2

Use the periodic table to answer the following questions

11.)Based on it’s position in the Periodic Table, at room temperature, cadmium is most likely a _____________________

12.)The atomic number for Gallium is ______________________

13.)Zinc has ____________________ protons

14.)Iodine has _______________________ neutrons

15.)Group 17 is called the _________________________

16.)Selenium has ______________ valence electrons

17.)Copper has ____________________ electrons

18.)What is the independent variable? ______________________________19.)What is the dependent variable? _______________________________

Identify each scenario as exothermic or endothermic20.)_________________ Breaking bonds requires energy21.)________________ Reactants have greater potential energy than products22.)________________ C2H4O2 + NaHCO3 + energy CO2 + H2O = NaC2H3O2

23.)________________ Students combine Sodium Bicarbonate solution and calcium chloride, they note a temp. increase of 20 degrees

Base your answers to questions 24 through 26 on the table below and on your knowledge of Earth science. The table shows the elements and their percent compositions by mass in the five minerals present in a rock sample.

24.)Identify one use for the mineral garnet25.)Identify one mineral in this rock sample that can scratch the mineral olivine26.)All five of the minerals listed in the table are silicate minerals because they contain the elements silicon and oxygen.

State the name of one other mineral found on the “Properties of Common Minerals” chart that is a silicate mineral.

27.)Classify each diagram as either sedimentary, igneous or metamorphica. __________________________b. __________________________c. _________________________d. _________________________e. _________________________f. __________________________

28.)Make a chart to compare and contrast the rock samples shown in the picture

29.)Which diagram beset represents a sample of the metamorphic rock gneiss? [Diagrams show actual size]Explain your answer choice: -__________________________________________________________________________________________________________________________________________________________________________________________________

1.) Which diagram best represents molecules of matter in the solid phase?

Base your answers to questions 2 - 4 on the diagram below and your knowledge of science. The diagram shows two students ready to dive into a pool.

2.) Explain why student B has more potential energy than student A Student B is position higher than position A

3.) Student A drives from the board into the water. Explain why student A’s kinetic energy decreases as the student enters the water. Kinetic energy decreases due to friction of the water; also some kinetic energy is converted to other forms, heat, sound, motion of water

4.) Where is the kinetic energy of each student the greatest? Kinetic energy is greatest right before hitting the water

The diagram below shows a rock being placed in a graduated cylinder containing water.

5.) What property does this tool measure? Volume6.) What value would be given to this rock? (Give proper units) 10mL7.) The mass of the rock is 0.03 kilograms. How many grams is this rock?

30 g8.) Using your converted mass from question 7, what is the density of the

rock? (Give proper units) 3 g/mL

9.) Create a graph of the following data

10.)When calcium carbonate (CaCO3) is heated, it decomposes to form calcium oxide (CaO) and carbon dioxide (CO2). The equation below shows this reaction.

CaCO3 CaO + CO2

In this reaction, the mass of CaCO3

a. Is less than the mass of CaO plus the mass of CO2

b. Is greater than the mass of CaO plus the mass of CO2

c. Equals the mass of CaO plus the mass of CO2

d. Equals the mass of CaO minus the mass of CO2

Use the periodic table to answer the following questions

11.)Based on it’s position in the Periodic Table, at room temperature, cadmium is most likely a _____________________

12.)The atomic number for Gallium is ______________________

13.)Zinc has ____________________ protons

14.)Iodine has _______________________ neutrons

15.)Group 17 is called the _________________________

16.)Selenium has ______________ valence electrons

17.)Copper has ____________________ electrons

18.)What is the independent variable? ______________________________19.)What is the dependent variable? _______________________________

Identify each scenario as exothermic or endothermic20.)_________________ Breaking bonds requires energy21.)________________ Reactants have greater potential energy than products22.)________________ C2H4O2 + NaHCO3 + energy CO2 + H2O = NaC2H3O2

23.)________________ Students combine Sodium Bicarbonate solution and calcium chloride, they note a temp. increase of 20 degrees

Base your answers to questions 24 through 26 on the table below and on your knowledge of Earth science. The table shows the elements and their percent compositions by mass in the five minerals present in a rock sample.

24.)Identify one use for the mineral garnet25.)Identify one mineral in this rock sample that can scratch the mineral olivine26.)All five of the minerals listed in the table are silicate minerals because they contain the elements silicon and oxygen.

State the name of one other mineral found on the “Properties of Common Minerals” chart that is a silicate mineral.

27.)Classify each diagram as either sedimentary, igneous or metamorphica. __________________________b. __________________________c. _________________________d. _________________________e. _________________________f. __________________________

28.)Make a chart to compare and contrast the rock samples shown in the picture

29.)Which diagram beset represents a sample of the metamorphic rock gneiss? [Diagrams show actual size]Explain your answer choice: -__________________________________________________________________________________________________________________________________________________________________________________________________