Daily Questions Oct. 14-18

1. Daily Questions Oct. 14-18 Oct. 14 42g of Na react with unknown amount of Cl to produce 100g of NaCl. How much Cl was used? Na + Cl ------NaCl 42g+ x 100g 50g of Cl 52g of Cl 56g of Cl 58g of Cl

2. Oct. 15 • _____N2 +3H2 ------2NH3 • What would the coefficient be in the first part of the formula? • a. 1 • b. 3 • c. 2 • d. 0

3. Oct. 16 • According to the LOCOM, how many grams of beryllium sulfide are produced in this reaction? • Be + S -----BeS • 24 + 68 ---- ? • A. 92g of BeS • B. 84g of BeS • C. 100g of BeS • D. 44g of BeS

4. Oct. 21 • When the reactants in a chemical reaction produce new products, what happens to the mass of the reactants? • A. it changes into something new • B. it adds new atoms • C. atoms are lost during the reaction • D. it stays the same

5. Oct. 22 • If physical reactions can be easily reversed, can the same be said for chemical reactions? Why or why not?

6. Oct. 23 • Through which of the following things will heat travel the fastest? • A. glass • B. metal • C. plastic D. wood

7. Oct. 25 • During a science lab investigating chemical reactions, Mrs. Poe’s students placed an antacid tablet in a zip lock bag. The recorded mass of the tablet was 25 g and the bag was 60 g. After the tablet fizzled and disappeared, the bag filled with gas. If the total mass of the bag+tablet+water was 135 g before the reaction, what was the total of bag+liquid+gas after the reaction? • A. 60 g • B. 75 g • C. 135 g • D. 270 g