Unit 1 Summary HW problems starting with #12 on pg. 48

Chemistry Homework Questions: Unit 1

By Kelly Moran

pg 48

12.) a.) The elements in this chemical formula include 3 Hydrogen atoms, 1 Phosphorus atom, and 4 Oxygen atoms. 

       b.) In this chemical formula there is 1 atom of Sodium, Oxygen, and Hydrogen.

       c.) In this chemical formula there is 1 atom of Sulfur and 2 atoms of Oxygen. 

13.) a.) metal

       b.) nonmetals 

       c.) nonmetals 

       d.) metal 

14.) Two metalloids are Boron (B) and Silicon (S).

15.) If you tapped a sample of nickel with a hammer, I would predict that the nickel my bend or flatten out.

16.) Nonmetals are not ductile which is one reason why they're unsuitable for electric wiring. Nonmetals usually don't conduct electricity which is another reason why they're unsuitable for electric wiring. Also even if they do conduct electricity they break easily because they're very brittle.

17.) Three properties that make metals suitable for coins are that they are malleable (meaning they are easily shaped and can form a coin), they are durable (last for decades without falling apart or shattering), and lastly they are very cheap to make therefore they are suited well for coins.