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Allisa [31]
3 years ago
8

Who said atoms are neither created nor destroyed in chemical reactions?

Chemistry
1 answer:
san4es73 [151]3 years ago
8 0
John Dalton from 1803
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How many atoms of oxygen are in 0.100 miles of silicon dioxide, SiO^2
mixas84 [53]
<span>3.10 moles SiO2 (1 mole Si/1 mole SiO2)(6.022 X 1023/1 mole Si) = 1.87 X 1024
</span><span>= 1.20 X 1023 atoms of oxygen.</span>
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2 years ago
Physical properties of reactants: Physical properties of products: 12.
dolphi86 [110]

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6 0
3 years ago
Find the density of a piece of glass with a mass of 500g and a volume of 200cm3
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D = 500 g /200 cm^3
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3 0
3 years ago
The time it takes to run a kilometer depends on the amount of exercise a person gets.
Debora [2.8K]
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3 0
3 years ago
How many kilojoules are required to convert 115.0 g of ice at 0.0 ∘c to liquid water at 32 ∘c? the heat of fusion of water is 33
Ivanshal [37]
The answer is 53.8 kJ.
Solution:There are two major steps in converting ice to liquid water. It begins with a phase change when ice melts at 0.0°C, and then a temperature change when the liquid water rises in temperature from zero to 32°C.
The amount of heat involved with the phase change melting is given by
     q = (mass of water) (ΔHfus)
        = (115.0 g)(334 J/g) 
        = 38410 J = 38.41 kJ
The amount of heat involved with temperature change is 
     q = mcΔT
        = (115.0g)(4.184J/g°C)(32°C - 0.0°C)
        = 15397.12 J = 15.39712 kJ
Summing up the two values gives the total heat required to convert ice to liquid water:
     q = 38.41 kJ + 15.39712 kJ= 53.8 kJ
3 0
2 years ago
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