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1 . I recently went to the dentist for a procedure that required me to have laughing gas ( nitrous oxide , or N 2
O ). I specified that I wanted EXACTLY 1.000 x 10 25 molecules of this gas delivered to me . If he was going to be my dentist , he had to prove to me he knew a little chemistry . How many grams would he have to deliver ?
2 . When answering the question of what I would do for a Klondike bar , I said I would jump into the Nile river with a crocodile while wearing 5.50 x 10 25 atoms of lead on my body . What would be the mass of this lead in kg?
3 . In the image below , which reaction type is represented in equation 2 ?
4 . If I ask you to write an equation representing a chemica reaction , you must first know
5 . Oxidation-reduction reactions are also known as redox reactions . We learned about their unique characteristics in this lesson . Which of the following would be a FALSE statement given what we learned about redox reactions ?
6 . There are many signs we can observe to tell us if a chemical reaction has taken place . Which of these would NOT be one of those signs ?
7 . You have to be careful about pouring drano down your pipes since it is mainly hydrochloric acid--you can ' t do it if they are made of aluminum because it will dissolve them ! You can ' t acid clean your aluminum auto parts for the same reasons : 2 Al + 6 HCl → 2 AlCl3 + 3H2 . If you were able to dissolve 10.0 mol of Al , how many many moles of hydrogen gas could you make ? NOTE : All numbers located immediately after elemental symbols should be considered subscripts
8 . You have to be careful about pouring drano down your pipes since it is mainly hydrochloric acid--you can ' t do it if they are made of aluminum because it will dissolve them !