24. Which oftho following bas . stashed endalpy oftmation vahae of mo at 25-cr m

Question

24. Which oftho following bas . stashed endalpy oftmation vahae of mo at 25-cr much heat is gained by nickel when 21.9 g of nickel is warmed from 24.6 C to 61.9 C7 The specific heat of nickel is 0.443g-C). A)3.62×10 B) 16.52 O 601 x 10 D) 2.39 x 102 J E) 27.42J A50-g sample of a white, powdery solid is heated in the presence of air. The solid remaining after heating now has a mass of 3.2 The reaction that took place must have been aan) A) acid-base reaction B) precipitation reaction. C) decomposition.reaction. D) combination reaction E) displacement reaction 27, Ifa sample of nitrogen gas in a sealed container of fixed volume is heated from 25°C to 175°C, the value of which of the following quantities will remain constant? A) the average speed of the molecules B) the average intensity of a molecular collision with the walls of the container C) the density of the nitrogen D) the average kinetic energy of the molecules E) the pressure of the gas 28. Which of the following is best described as an oxidation-reduction reaction? A) 2C1(x) Cl2(g) D) 30,(g) 20,(g)

Explanation / Answer

Q24

the value is 0 for:

- Pure substances

- Alltropes

- STP conditions

from the list,

only S8(s) is elemental

so choos eD

Q25

Apply

Q = m*C*(Tf-Ti)

Q = 21.9*0.443*(61.9-24.6)

Q = 361.87 J

from the list, choose A

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