11. The centigram balance is most sensitive out of all the balance such as elect

Question

11. The centigram balance is most sensitive out of all the balance such as electronic balance. a. True b. False 12. A group of four one cent coins is weighed on an electronic balance of intermediate sensitivity and has a mass of 10.147 g. What mass in grams should be reported for the average mass of a single coin of the group? a. 2.0g b. 2.53g c. 2.5367g d. 2.537g 13. Which one of the following represents a chemical change? A) bling water to form steam B)buming a piece of coal C) heating lead until it melts D) xing iron filings and sand at room temperature E) breaking glass

Explanation / Answer

1.False, centigram balance can only help you to get 2 decimals, electronic balance can get you 3 decimals and there are more sensitive balances.

2. Use the same number of significant figures you already have with the total mass data (3 digits). You sould report 2.537 g

3. The chemical change is b) Burning a piece of coal, the materials will change their structure, at the end of the process you wont have coal anymore.

The other ones are physical changes.

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