Help with chemistry questions?

Question

1. how are the Celsius and kelvin scales related? how are they different?

2. 5 trillionths in scientific notation

perform the following calculations using significant figures properly.

3. 2588 + 12.35

4. 2004 x 0.071

5. 3.436 / 1.28

thanks for the help! ^_^

Answer 1

I just wanted to correct errors in both of the previous answers.

1. Mark C was correct with his answer: Celsius and Kelvin increase by the same magnitude (ie. an increase of 10 degrees in Celsius will be an increase of 10 degrees in Kelvin), just that Kelvin starts at 0 degrees, while Celsius starts at -273 degrees. So basically, Kelvin will just be whatever the temperature is in Celsius, plus 273.

2. Scientific notation for 5 trillionths should definitely have a negative power. It is essentially 5 divided by one trillion (10^12), 5 / 0^12, or, since division is the same as multiplying by the reciprocal, it could be 5 x 10^-12. Mark C's first estimation was correct.

3. With adding and subtracting, the figure with the least amount of decimal places in the question will determine the number of decimal places in the answer. There are 0 digits after the decimal point of 2588, so the answer will have 0 digits after the decimal point too:

2588 + 12.35 = 2600.35 = 2600 (after applying significant figures)

4. Division and multiplication have different rules. The information with the least amount of significant figures in the information determines how many significant figures will be in the answer. The lowest amount of significant figures given is 2 (with 0.071) so the answer should have 2 significant figures:

2004 x 0.071 = 142.284 (6 significant figures) = 1.4 x 10^2 (2 significant figures)

5. The figure 1.28 has 3 significant figures, so the answer needs 3 significant figures, which Mark C has done correctly (with his answer of 2.68).

Answer 2

i saw Mark C's answers..

think 1 is correct, although i don't think any extra citation on farenheit and other temperature scales is necessary...

no 2 is wrong. it should be 5 x 10 ^ + 12 (it should be raised to positive 12, otherwise you're going to have a very small number)

3,4 and 5 are correct. just wnted to make a correction on number 2..

Answer 3

1. Celsius and Kelvin increase by the same amount of temperature (1) where are Fahrenheit increases based on the Celsius scale. The difference is that Celsius has a minimum temperature of -273.15 and Kelvin has a minimum temperature of 0 (absolute 0).

2. Either it's 5*10^-12 or 5*10^-13. somewhere around there

3. 2600.35

4. 142

5. 2.68

i gave you the answers. but for future reference it would probably help to know all the significant figure rules because that would be far more helpful than just getting answers. enjoy.