 Shown to the right is a growth curve for Paramecium grown in 1.0 L flask containing pond water at 20  C. The pond water is continually filtered to remove waste products, and nutrients are added at a constant rate. (write down the question and your answer)  How could the experiment be modified to determine whether temperature influences the population size of Paramecium? A. Repeat the procedures described using 1 flask, and increase the temperature to 25  C for days B. Repeat the procedures described using 1 flask, and vary the temperature randomly during the entire incubation time. C. Repeat the procedures described using 2 flasks; incubate 1 flask at 15  C and the other at 25  C D. Repeat the procedures described using 2 flasks; incubate both flasks at 20  C Bell ringer September 8, 2015

 The chart to the right shows a variety of things sorted into two different groups.  Write down the statement you think best describes the two groups and explain your thinking. A. Both groups are made up of cells B. Both groups are made up of atoms C. Group A is made up of cells; Group B is made up of atoms D. Group A is made up of cells and atoms; Group B is made up of atoms E. Some things in Group A are made up of cells and some things in group B are made up of atoms. F. Group A and Group B are made up of both cells and atoms Bell ringer September 10, 2015 Group AGroup B Leaf of a plantSpoonful of salt Horse’s musclePiece of metal Cap of a mushroomDiamond necklace Baby elephantProtein Seed of a bean plantSugar cube Bloodair

 Write down each example and whether it is a chemical or physical change.  Cutting your hair.  Food spoiling.  A tree burns to ashes.  Copper turns green when exposed to the environment. Bell ringer September 10, 2015

 Fill in the blanks. Write down the first two complete statements. Only provide the answer for the last one.  The nucleus of a certain atom has 17 protons and 18 neutrons. The atom has _____ (#)_________ electrons.  If the atom had 17 protons and 19 neutrons, the atom would have ______(#)____ electrons.  If the nucleus having 17 protons and 19 neutrons lost one proton and two neutrons, what change in the number of electrons would be needed to keep the atom electrically neutral? Bell ringer September 11, 2015

 Write down the different parts.  Use the information to tell me the following information:  Element:  Atomic Number:  Atomic Mass:  Protons:  Neutrons:  Electrons: Bell ringer September 14, 2015

1. Lead (Pb-208) is the heaviest stable isotope known. It has an atomic number of 82. How many neutrons does Pb- 208 have? A. 82 B. 126 C. 164 D. 208 (Show your math, provide correct answer, do not need to write down question) Bell ringer September 15, Carbon-14 is a radioactive isotope used to determine the age of ancient objects composed of organic matter. Carbon-12 and carbon-13 are other isotopes of carbon. The number of what subatomic particles varies among these carbon isotopes? A. Electrons B. Neutrons C. Photons D. Protons (Do not have to write question, explain why the subatomic particle you picked is correct)

 Refer to the graph to the right Reaction 1 in the graph A. Is the same as reaction 2 but faster B. Occurred in the presence of a catalyst C. Did not occur in the presence of a catalyst D. Will form a different product than reaction 2 Bell ringer September 16, 2015

Write down full correct answer.  The chemical bond formed when two atoms share one or more pairs of electrons is a(n) A. Ionic bond B. Orbital bond C. Polar bond D. Covalent bond  The chemical bond formed when two atoms transfer one or more pairs of electrons is a)n) A. Ionic bond B. Orbital bond C. Polar bond D. Covalent bond Bell ringer September 17, 2015