Consider the following specific heats of metals. If the same amount of heat is added to 50.0 g samples of each of the metals, which are all at the same temperature, which metal will reach the lowest temperature?
Metal Specific Heat (J/g?°C)
Alimunum 0.900
Copper 0.385
Iron 0.449
silver 0.235
A. Al B. Cu C. Fe D. Ag E. They will reach to the same temperature.
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18. What type of a reaction occurs when an acetic acid solution is mixed with a potassium hydroxide solution?
A. oxidation-reduction
B. acid-base neutralization
C. precipitation
D. gas evolution
E. no reaction
Solution
# .Heat = mass × specific heat × change in temp.
So, change in temp. = Heat / mass×specific heat .
So by knowing the specific heat of each metal and the heat of the system , the Change in temp. can be calculated and then the lowest temperature metal can be detected.
18 .
CH3COOH (acetic acid) + KOH ( potassium hydroxide) = CH3COOK (potassium acetate) + H2O .
This is an acid - base neutralisation reaction where acetic acid is weak acid and KOH is strong base.
Hence (B) is correct.
.
MARGINALIZATION (Different learners in Marginalized Group
Consider the following specific heats of metals- If the same amount of.docx
1. Consider the following specific heats of metals. If the same amount of heat is added to 50.0 g
samples of each of the metals, which are all at the same temperature, which metal will reach the
lowest temperature?
Metal Specific Heat (J/g?°C)
Alimunum 0.900
Copper 0.385
Iron 0.449
silver 0.235
A. Al B. Cu C. Fe D. Ag E. They will reach to the same temperature.
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18. What type of a reaction occurs when an acetic acid solution is mixed with a potassium
hydroxide solution?
A. oxidation-reduction
B. acid-base neutralization
C. precipitation
D. gas evolution
E. no reaction
Solution
# .Heat = mass × specific heat × change in temp.
So, change in temp. = Heat / mass×specific heat .
2. So by knowing the specific heat of each metal and the heat of the system , the Change in temp.
can be calculated and then the lowest temperature metal can be detected.
18 .
CH3COOH (acetic acid) + KOH ( potassium hydroxide) = CH3COOK (potassium acetate) +
H2O .
This is an acid - base neutralisation reaction where acetic acid is weak acid and KOH is strong
base.
Hence (B) is correct.
