2 years ago

Which of the following would increase the surface area of a solid so that it dissolves faster?

1 answer:

4 0

Increasing the surface area increases the rate of solubility of a solid because a larger number of molecules of the greater surface area have contact with the solvent

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Which property is better explained by the band theory than by the sea-of-electrons model?

Sonbull [250]

Luster is the correct answer.

8 0

2 years ago

How much heat is evolved in converting 1.00 mol of steam at 155.0 ∘c to ice at -50.0 ∘c? the heat capacity of steam is 2.01 j/(g

Ne4ueva [31]

When the specific heat capacity of the water is 4.18 J/g.°C so, we are going to use this formula to get the heat for cooling three phases changes from steam to liquid and from liquid to ice (solid) :

when Q = M*C*ΔT

Q is the heat in J

and M is the mass in gram = 1 mol H2O * 18 g/mol(molar mass) = 18 g

C is the specific heat J/g.°C

ΔT is the change in temperature

Q = Mw *[ ( Csteam * ΔTsteam)+(Cw*ΔTw) + (Cice * ΔT ice)]

= 18 g * [(2.01 * (155-100°C)) + (4.18 * (100-0°C)) + (2.09 * (0 - 55 °C))]

∴Q = 7444.8 J

and when we know that the heat of fusion for water = 334J/g

and heat of vaporization for water = 2260J/g

∴Q for the two phases changes = M * (2260+334)

= 18 * (2260+334)

= 46692 J

∴ Q total = 7444.8 + 46692 = 54136.8 J

5 0

2 years ago

The density of liquid oxygen at its boiling point is 1.14 kg/L , and its heat of vaporization is 213 kJ/kg . How much energy in

-Dominant- [34]

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2 years ago

Which change does an increase in heat energy cause?

Bumek [7]

Answer:

C more collision between molecules

Explanation:

increase in heat causes increase in kinetic energy of the particles