1. A steel is 80 cm long at 40 oC. The coefficient of linear expansion for steel is 12 x 10-6 oC-1. The increase in length and the final length when it is at 140 oC will be… QUESTION : ΔL...? then L..?

2. An iron rod heated from 30 oC to 80 oC. The final length of iron is 115 cm and the coefficient of linear expansion is 3×10-3 oC-1. What is the original length and the change in length of the iron ?
QUESTION L0...then ΔL?

3. at 20oC, the length of a sheet of steel is 50 cm and width is 30 cm ,if the coefficient of expansion for steel is 10-5 oC-1.
determine the change in area and the final area at 60oC
question ..ΔA...?A...?

4. An object made of metal has a length of 20 cm. How long is the end of the metal if there is a temperature change of 40 ° C? (metal length coefficient 0.001 ° C-1)

5. A plate made of aluminum with the initial area of 50 cm2 has a temperature of 10oC. If the plate is heated to 100oC, what is the extensive increase in aluminum? (Aluminum Length Coefficient = 2.4 × 10-5 / OC)

How many grams of n2h4 will be consumed by 23 g of n2o4

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *