Round off the following measurements to two significant figures. Write the answers in scientific notation. a. 6310 m b. 125.00 Kg c. 6906 km d. 0.0828 m need steps and formela

Explanation:

a. 6310 m

Two significant numbers means it must have only 2  digits. The first two digits are 6 and 3. The next number 1 is not up to 5 hence it would be round off to zero.

Two s.f = 6300

Converting it to scientific notation means it must be expressed by a number between 1 and 10, multiplied by a power of 10.

6.3 x 10^3

b. 125.00 Kg

Two significant numbers means it must have only 2  digits. The first two digits are 1 and 2. The next number 5 is up to 5 hence it would be round up to one.

Two s.f = 130.00

Converting it to scientific notation means it must be expressed by a number between 1 and 10, multiplied by a power of 10.

Scientific notation = 1.3 x 10^2

c. 6906 km

Two significant numbers means it must have only 2  digits. The first two digits are 6 and 9. The next number 0 is not up to 5 hence it would be round up to zero.

Two s.f = 6900

Converting it to scientific notation means it must be expressed by a number between 1 and 10, multiplied by a power of 10.

Scientific notation = 6.9 x 10^3

d. 0.0828 m

Two significant numbers means it must have only 2  digits. The first two digits(excluding zero) are 8 and 2 . The next number 8 is up to 5 hence it would be round up to one.

Two s.f = 0.083

Converting it to scientific notation means it must be expressed by a number between 1 and 10, multiplied by a power of 10.

Scientific notation = 8.3 x 10^-2

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.