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I need help in chemi P1 PLZ!

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farahkuwait:
Ok so i have to questions:
1- what is the relationship between: (barium nitrate+Hydrochloric acid) if theres any..
2- when volume of water increases, what happens to the temperature,, example:

15 When solid X is dissolved in water, an endothermic change takes place.
When 5 g of X are dissolved in 1000 cm3 of water, a temperature change of 10 °C occurs.
Which temperature change occurs when 5 g of X are dissolved in 500 cm3 of water?
A. a decrease of 20 °C
B. a decrease of 5 °C
C. an increase of 20 °C
D. an increase of 5 °C

??

SoONa:
heyy .. i know the answer to the last question cuz i did it yesterday .. the answer is a decrease by 20.. cuz its endothermic so a decrease in temp and we halfed the conc. so doubled the temp.. ..
good luck

Ghost Of Highbury:

--- Quote from: farahkuwait on May 25, 2010, 08:24:38 am ---Ok so i have to questions:
1- what is the relationship between: (barium nitrate+Hydrochloric acid) if theres any..
2- when volume of water increases, what happens to the temperature,, example:

15 When solid X is dissolved in water, an endothermic change takes place.
When 5 g of X are dissolved in 1000 cm3 of water, a temperature change of 10 °C occurs.
Which temperature change occurs when 5 g of X are dissolved in 500 cm3 of water?
A. a decrease of 20 °C
B. a decrease of 5 °C
C. an increase of 20 °C
D. an increase of 5 °C

??


--- End quote ---

Barium nitrate + HCl = Barium Chloride + Nitric acid

Inversely proportional , volume of water decreases, more heat taken in.

(10*1000)/500 = 20

decreases by 20.

decreases because its endothermic.

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