SEQUENCE # 1. A piece of volcanic rock washed up on the 79th Street Beach. The r

Question

SEQUENCE # 1. A piece of volcanic rock washed up on the 79th Street Beach. The rock (a) What is the rock's density? (b) If the nearest volcano is in Martinique, how did the rock probably get to Miami Beach? of 863 ml and a mass of 729 grams. has a volume 2. Suppose when you made measurements for the unknown liquid, the value you recorded for the mass of the empty beaker was 5.00 grams too low. All other measurements were correct. Answer each of the following questions in one complete sentence. (a) How would this error seem to affect the mass of the unknown liquid? (b) How would this error seem to affect the density of the unknown liquid? 3. The density of air and carbon dioxide are given in the theory section. Suppose your neighbor's $300 Cuisinart Food Processor is on fire in the kitchen. You use a carbon dioxide extinguisher to put the fire out. Why does the density of carbon dioxide, as compared to air, make this gas useful as a fire extinguisher? Exp. 1.11

Explanation / Answer

Part 1)

a) We know that density = mass/volume

Here, mass of the volcanic rock = 729 g

Volume of the volcanic rock = 863 mL

Therefore, density of the rock = 729/863 = 0.844

b) Since the nearest volcano is in Martinique, the volcanic rock must have reached Miami through the ocean currents of Atlantic

Part 2)

a) Here, the mass of the empty beaker is taken as 5 g lesser. Therefore, mass of unknown liquid will be 5 g higher

b) Here, volume remains the same. Therefore, according to the following relation,

Density = Mass/Volume

A higher density will be recorded

Part 3)

The density of air is 1.225 kg/m3 and density of carbon dioxide is 1.98 kg/m3. Since the density of carbon dioxide is higher, It covers the burning substance on which it is sprayed by displacing air. Once the oxygen supply from the air stops, the combustion stops.

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