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3 years ago

Complete the following statements to describe solids, liquids, and gases. Select the correct answer fror

Chemistry

1 answer:

sukhopar [10]3 years ago

5 0

Answer:

solid is definite volume and shape

liquid is a definite volume but not a definite shape because it can move around and fit into different shapes, like on different water bottles.

gas is not a definite volume and not a definite shape because gas particles can expand and spread out which affects both volume and shape

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The normal freezing point of cyclohexane is 6.55 C. When 0.458 g of benzophenone is dissolved in 15.0 g of cyclohexane, the free

ella [17]

Answer:

The experimental molar mass of benzophenone is 182 g/m (option A)

Explanation:

ΔT = Kf . m . i

(i means the Van't Hoff factor, since benzophenone is not electrolyte, the value for i is 1)

ΔT = T° - T' (Melting temp sv pure - Melting temp sv in sl)

Kf is data (the cryoscopic constant)

m is molality (moles from solute in 1kg of solvent)

6,55°C - 3,19°C = 20,0° C/m . m

3,36 °C = 20,0 C/m . m

3,36 °C /20,0 m/C = m

0,168 = m

We have 0,168 moles of benzophenone in 1 kg of cyclohexane but we don't have 1kg, we have just 15 g so, we need the rule of three.

1000 g ______ 0,168 moles

15 g ________ (15 g . 0,168 m) / 1000 g = 0,00252 m

Now we can get the molar mass:

0,458 g of benzophenone / 0,00252 moles = 181,7 g/m

3 0

3 years ago

(f) what is the observed rotation of 100 ml of a solution that contains 0.01 mole of d and 0.005 mole of l? (assume a 1-dm path

never [62]

<span>Answer: .01 moles of D to .005 moles of L ~ so, .01+.005 = .015 total; using this total value, divide the portions of D and L. so .01/.015 to .005/.015 ~ 67% D to 33% L. And thus, the enantiomer excess will be 34%.</span>

4 0

3 years ago

Read 2 more answers

3. Some scientists create

Ghella [55]

Answer:

Lemonade is a man made material

Explanation:

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3 years ago

Refrigerant-134a enters the coils of the evaporator of a refrigeration system as a saturated liquid-vapor mixture at a pressure

Firdavs [7]

Answer:

(a) 0.699 kJ/K

(b) -0.671 kJ/K

Explanation:

The Refrigerant-134a flows into the evaporator as a saturated liquid-vapor mixture and flows out as a saturated vapor at a saturation pressure of 160 kPa and temperature of -15.64°C (estimated from the Saturated Refrigerant-134a Temperature Table).

(a) The entropy change of the refrigerant (ΔS $_{R-134a}$ ) = Q/T $_{1}$

Q = 180 kJ

T $_{1}$ = -15.64 + 273.15 = 257.51 K

ΔS $_{R-134a}$ = Q/T $_{1}$ = 180/257.51 = 0.699 kJ/K

(b) The entropy change (ΔS $_{c}$ ) of the cooled space (ΔS $_{c}$ ) = -Q/T $_{2}$

Q = -180 kJ

T $_{2}$ = -5 + 273.15 = 268.15 K

ΔS $_{c}$ = Q/T $_{2}$ = -180/268.15 = -0.671 kJ/K

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3 years ago

What is the electron configuration of a noble gas?

Debora [2.8K]

Answer:

A noble gas configuration of an atom consists of the elemental symbol of the last noble gas prior to that atom, followed by the configuration of the remaining electrons. So for sodium, we make the substitution of [Ne] for the 1s22s22p6 part of the configuration. Sodium's noble gas configuration becomes [Ne]3s1. That is the answer.

Explanation:

Brainliest Please.

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3 years ago