Physics Problem Expansion G7 2nd Semester

Expansion Problem
EXERCISE 1 :
1. A brass rod is 1,0 m length at 200C. What is its length at 1500 C ?
    (α = 1.9 x 10-5 / 0C )

2. A steel rod is 12 m length at 00C. How much will the steel elongate if it is heated by 420C ?
    ( α = 1.1 x   10-5 / 0C ).

3. A plate of Pyrex glass measures 100 m length and 75m width at 230C. What is its area if the tempera     ture    is increased by 880C ? ( α = 3.2 x 10-4 / 0C )

4. The volume of a solid cylindrical copper at 400C is 4 liter. What is its volume if the temperature in- creased by 1400C ? ( α = 1.7 x 10-5 / 0C )

5. The volume of ethyl alcohol at 300C is 100 ml. What is its volume if the tempeature increased by 700C ?
    ( = 1.12 x 10-4 / 0C ).

Chemistry G7 1st Semester

Answer this questions !
1. What are the element names of the following symbol?
H O N P Fe Au
2. Write the symbols of the following elements !
Sodium, hydrogen, oxygen, iron, copper
3. Explain the differences between elements and compounds!