Dear friend,
Because the water remains water throughout this process, it is not undergoing any chemical change. There is no new substance or element added but only a change of form.
Answer:
Cost of silk was too high
Explanation:
The major reason of not using silk as a fabric in the hot air balloons was high cost of silk. Due to its high cost, silk became unaffordable for use in modern balloon.
If cost is neglected, then silk is the perfect material for hot air balloon as it is light in weight
Answer:
the molecular formula is C₁₄H₈O₂
Explanation:
Given that
The freezing point of camphor is lowered by 22.3°C
Amount of anthraquinone is 1.32g
depression constant is 40°C.kg.mol
Use the freezing-point depression equation
Molecular weight of solute, m =
m = 208g/mol
empirical formula of Anthraquinone is C7H4O
empirical formula weight = 104 g/mol
m = Molecular formula weight / empirical formula weight
m = 208 / 104
208.2 / 104.1 = 2
molecular formula = (C₇H₄O)₂
so, the molecular formula is C₁₄H₈O₂
The dependent variable depends on the independent variable
Answer:
This metal could be lead
Specific heat = 0.0308 cal/g°C
Explanation:
Step 1: Data given
The metal was heated to 115.0°C
in a calorimeter where it cooled to 32.6°C.
Mass of the metal = 25.0 grams
Heat released = 63.5 cal
Step 2: Calculate the specific heat of the metal
Q = m*c*ΔT
⇒with Q = the heat released = 63.5 cal
⇒with m = the mass of the metal = 25.0 grams
⇒with ΔT = the change of temperature = T2 - T1 = 32.6 °C - 115.0°C = -82.4 °C
⇒ c = the specific heat = TO BE DETERMINED
63.5 = 25.0 * c * 82.4
C = 0.0308 cal/g°C
This metal could be lead