Chem120 Week 1 Quiz 2020

Question 1 :       (TCO 1) You have been growing the same variety of corn for over 5 years.  In the past two years, you have noticed that the yield has decreased by 10% each year.  You grow corn on 10 acres of land and your yield should be 1,000 bushels per acre.  Growing conditions have been consistent for the past 5 years.   You want to identify another variety of corn that will produce 1,000 bushels per acre.  You currently grow Variety ZQB.  You want to test two new varieties, CAQ and TWX.  You hypothesize that CAQ will produce 1,000 bushels per acre.  Design an experiment to test this hypothesis.  Include your control(s) (2 pts) and your experimental design (4 pts).  Describe the experimental results that would support your hypothesis. (2 pts)  Be specific.

Question 2.(TCO 1) How many meters are in 9 yards? Show your work.

Question 3.(TCO 1) How many mm are in 8.7 inches?  Show your work.

Question 4.(TCO 1) What is the mass of 50.0 mL of an intravenous glucose solution with a density of 1.15 g/mL? Show your work.

Question 5.(TCO 2) Determine the number of protons, neutrons and electron for the element Sodium.  The mass number for the isotope of this element is 25.  You must show your work for each determination to receive credit.  (2 pts per determination)

Question 6.(TCO 2) Consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the element is

                                         94.

                                         30.

                                         64.

                                         32.

                                         34.         

Question 7.(TCO 2) No matter how much extra oxygen is available, 12 grams of carbon always combines with 32 grams of oxygen.  This best illustrates the law of

                                         conservation of mass.

                                         multiple proportions.

                                         definite proportions.

                                         all of the above.

                                         none of the above.

Question 8. (TCO 2) Which type of radioactivity has essentially no mass?

                                         alpha

                                         beta

                                         gamma

                                         all of the above.

                                         none of the above.

Question 9.(TCO 2) The proton has

                                         the same mass and charge as the electron.

                                         the smaller mass and same charge as the electron.

                                         a smaller mass and opposite charge as the electron.

                                         a larger mass and opposite charge as the electron.

                                         none of the above.

Question 10.                   (TCO 2) Which subatomic particles have approximately the same mass?

                                         electrons and neutrons

                                         electrons and protons

                                         neutrons and protons

                                         electrons, neutrons and protons

                                         none of the above