Answer:
Explanation:
Given :
Mass of a bar of lead = 115.2 g
Initial water level 
= 25 mL
Final water level = 35.5 mL
Difference in the water level = 35.5 - 25
= 10.5 mL
= 
We know that when a body is submerged in water, it displaces its own volume of water.
Therefore, the volume of the lead bar = volume of the water displaced = 10.5 mL =
We know that mathematically, density is the ratio of mass of body to its volume.
Density of the lead bar is given by :
=
Answer:
3.0585147719047385 is the answer
Answer:
Common combustion reactions break the bonds of hydrocarbon molecules,
Explanation:
the resulting water and carbon dioxide bonds always release more energy than was used to break the original hydrocarbon bonds. That's why burning materials mainly made up of hydrocarbons produces energy and is exothermic.
Answer:
Explanation:
a ) The temperature of water increases from 21.3°C to 48.4°C .
b ) Heat flow of water ( q) is positive because there is rise in temperature .
c ) The temperature of metal decreases from 99.3⁰C to 48.4⁰C .
d ) Heat flow of metal is negative because there is fall in temperature .
e ) heat loss of metal = heat gain by water
heat gain by water ( q ) = 50 x 4.2 x ( 48.4 - 21.3 )
= 5691 J
q = 5690 J . ( 3 significant figures )
heat loss of metal = mass x specific heat x fall in temp = 5691
150 x specific heat x ( 99.3 - 48.4 ) = 5691
specific heat = 5691 / (150 x 50.9 )
= .745 J / g C ( three significant figures )
