When you have selected your answer to each question, blacken the corresponding s

Question

When you have selected your answer to each question, blacken the corresponding space on the answer sheet using a soft #2 pencil. Make a heavy, full mark, but no stray marks. If you decided to change an answer, crease the unwanted mark very carefully. Make no marks on the test booklet. Do all calculations on scratch paper provided by your instructor. There is only one correct answer to each question. Any questions for which more than one has been blackened will not be counted. Your score is based solely on the number of questions answer correctly. It is to your advantage to answer very question. What could this picture represent? (A) pure element (B) homogeneous mixture (C) pure compound (D) heterogeneous mixture Which represents four molecules of oxygen gas? When 27.3 g of Fe powder is completely burned in air, an iron oxide is produced. The maw of the iron oxide should be (A) leas than 27.3 g became mass is lost on burning. (B) equal to 27.3 g because matter is conserved in a chemical reaction. (C) greater than 27.3 g because oxygen has been added to the iron. (D) equal to 43.3 g which a equal to the initial mass of Fe plus the atomic mass of oxygen. What is the formula for a molecule of hydrogen? (A) H (B) H^+ (C) HCl (D) H_2 Which arrow on the phase diagram corresponds to the transition between initial and final states illustrated in Figure 1? (A) A (B) B (C) C (D) D Which is true? (A) Water is a puns element. (B) CH_4 is a pure compound. (C) H_2 O_2 is a homogeneous mixture. (D) Argon gas is a heterogeneous mixture. What does the line between points A and B represent in the phase diagram of a pure substance? (A) the triple point of the substance as the temperature it varied (B) the temperature at which solid and gas arc in equilibrium as the pressure is varied (C) the temperature at which liquid and solid are in equilibrium as the pressure is varied (D) the vapor pressure of the substance at varying temperatures

Explanation / Answer

1.(C) Pure compound

2.Oxygen molecule is O2 ,so it contains two Of atoms.

So option (A) is correct.

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