3445 1- Page 3 15) Compared to an atom of C-12, an atom of C-14 has A) fewer protons CY mone neutrons D) fewer neutrons B) more protons A What is the mass number of an atom which contairs 28 protons, 28 electrons, and 16) 34 heutrons? A) 62 B) 28 C) 56 D) 90 17) A sample of Nitrogen contains 95% AN atoms,3% EN atoms and 2% 16N atoms. What is the average atomic mass of this sample? A) 16 amu B) 13 amu D) 14 amu (9 15 amu 18) If Xis the symbol of an element, which pair correctly represents isotopes of X 158 64 X and 158 158 A) 158 X and 64 64 65 158 D) 159 158 158 B) X and X and 64 64 64 64 19) What is the atomic number of an atom with six valence electrons? D) 6 C) 12 B)) 8 A) 10 A strontium atom differs from a strontium ion in that the atom has a greater 20) C) number of electrons D) number of protons mass number B) atomic number D 21) What is the total number of electrons in a Mg2- ion? 10 C) 2 B) 12 A) 24 Which of the following is the electron-dot symbol for an atom with an electron 22) configuration of 2-5? D) .x. B)

I wish i could visit a tutor during these times.  May I please get a break down for number 12. I'm stuck on this question

Draw the structure of the major organic product of the reaction. 1. LIAIH4, ether 2. H₂0 ● You do not have to consider stereochemistry. Submit Answer ***I Q CI / Retry Entire Group [ ] در ? ChemDoodleⓇ [F 3 more group attempts remaining view Topics] [References]

correct statement is? a. Safety glasses should be worn in a laboratory at all times to decrease the likelihood of eye injury. b. Safety shower would immediately be used if your clothing caught fire or if a large chemical spill had occurred on your clothing. O c. It is not allowed to smoke in the lab. o d. If you have accidentally broken a test tube and spilled a chemical on the table, Caution your lab partners to avoid the area while you inform the teacher of the small accident. e. Use the eye-wash fountain ,then notify the instructor if a chemical gets in the eye.