Question

question 11 (5 points) which one of the following substances will float in gasoline, which has a density of 0.66 g/ml? balsa wood (density = 0.16 g/ml) sugar (density = 1.59 g/ml) aluminum (density = 2.70 g/ml) mercury (density = 13.6 g/ml) table salt (density = 2.16 g/ml) question 12 (5 points) a calculator answer of 423.6059 must be rounded off to three significant figures. what answer is reported? 420 423 424 423.7 423.6

Explanation:

Question 11:

Step1: Recall density - floating principle

A substance floats in another if its density is less than the density of the other substance.

Step2: Compare densities

The density of gasoline is 0.66 g/mL. Balsa wood has a density of 0.16 g/mL which is less than 0.66 g/mL. The other substances (sugar, aluminum, mercury, table - salt) have densities greater than 0.66 g/mL.

Question 12:

Step1: Understand significant figures

To round 423.6059 to three significant figures, we start counting from the left - most non - zero digit.

Step2: Perform rounding

The first three significant figures are 423. The digit after 3 is 6. According to the rounding rule (if the digit to be removed is 5 or greater, we round up), we round 423 to 424.

Answer:

Question 11: balsa wood (density = 0.16 g/mL)
Question 12: 424