The primary purpose of the scientific method is 2. True/False: Placing a metal s

Question

The primary purpose of the scientific method is 2. True/False: Placing a metal sample on water is an example of a physical change 3. Which of the following measurements is equivalent to the basic unit of volume? a) 1000ml c) 0.01KL b) 100cm' d) l0000ul 4. Round off the following numbers to one decimal place: a) 315.552 b) 1609 98 5. Determine the number of significant figures in each of the following values: a) 61.00 cm b) 0.3691 C) 4 0180 g 6. Which of the following measurements represents an intensive property? a) 4.15 times 10^-1kg c)50degreeC b) 0.22g/cm^3 d) 0.005m 7. a) 27.2 cm is equivalent to b) 1200g is equivalent to kg c) 600ml is equivalent to dL

Explanation / Answer

1. The primary purpose of the scientific method is to understand how the things work in our day to day life.

The scientific method actually helps in establishing theories on the basis of testing the hypothesis which is created. And these theories help us to understand the facts behind everything in the world.

2. Placing a metal sample on water is an example of physical change: False

The metal will react with water to form metal hydroxide. So, it is a chemical change and not a physical change.

3. The basic unit of volume is ml.

So, answer is a.

4. a. 315.552 = 315.6

When the next digit is equal to or greater than 5, then the round off increases one digit.

b. b. 1609.98 = 1610.0

As the next digit was 8, so the previous digit was increased by 1. 1609.9+0.1 = 1610.0

5. a. 61.00 cm = 4 significant figures

zeros after decimal are considered as significant.

b. 0.369 L = 3 significant figures

zeros before decimal are considered as insignificant.

c. 4.0180 g = 5 significant figures

zeros after decimal are considered as significant.

6. Intensive property is the property which does not change when the size of sample changes.

Density and temperature are intensive properties and mass and length are extensive properties.

So, answers are b and c.

7.

a. 27.2 cm into m

100 cm = 1 m

So, 27.2 cm = 27.2/100 = 0.272 m

b. 1200 g into kg

1000 g = 1 kg

So, 1200 g = 1200/1000 = 1.2 kg

c. 600 ml into dL

1000 ml = 10 dL

So, 600 ml = (10/1000)*600 = 6 dL

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