The tip of a match is ignited as it is struck against the matchbox. Why is this a chemical change? a.The color of the match tip
2 answers:
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<u>Answer:</u> The smallest temperature change is shown by water.
<u>Explanation:</u>
To calculate the heat absorbed or released, we use the equation:
......(1)
where,
q = heat absorbed = 200.0 J
m = mass of the substance
C = specific heat of substance
= change in temperature
As, the same amount of heat is getting absorbed in all the cases. So, the change in temperature will depend on the product of mass and specific heat.
For the given options:
- <u>Option a:</u> 50.0 g Fe,
We are given:
Putting values in equation 1, we get:
Change in temperature = 8.99°C
- <u>Option b:</u> 50.0 g water,
We are given:
Putting values in equation 1, we get:
Change in temperature = 0.96°C
- <u>Option b:</u> 25.0 g Pb,
We are given:
Putting values in equation 1, we get:
Change in temperature = 62.5°C
- <u>Option d:</u> 25.0 g Ag,
We are given:
Putting values in equation 1, we get:
Change in temperature = 34.04°C
- <u>Option e:</u> 25.0 g granite,
We are given:
Putting values in equation 1, we get:
Change in temperature = 10.13°C
Hence, the smallest temperature change is shown by water.
Answer:
0.119 moles
Explanation:
Given that,
Mass measured by Nurse Antonio is 7 grams of NaCl
To find,
The no of moles of NaCl
Solution,
The number of moles is given by
m is given mass
M is molar mass
For NaCl, molar mass is 23+35.5 = 58.5 grams
So,
Therefore, there are 0.119 moles of NaCl.