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4 years ago

Help me please im in 4th grade and online is frustrating

Chemistry

1 answer:

Snowcat [4.5K]4 years ago

7 0

Answer:

Explanation:

The answer is A) because the A container has tightly packed molecules but not as tight as C so that means A is liquid, and C is a solid which makes B a gas

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What is the name for CH3-CH2-CH2-O-CH2-CH3?

BabaBlast [244]

Answer:

idk maybe chlorine 12

Explanation:

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3 years ago

Five pellets of a metal have a total mass of 1.25 g and a total volume of 0.278 mL. What is the density of the metal in g/mL?

NNADVOKAT [17]

Answer:

Explanation:

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3 years ago

water at 400 kPa and 60°C while the other part is evacuated. The partition is now removed, and the water expands to fill the ent

kaheart [24]

Answer:

0.4912 kJ/K

Explanation:

Using steam table, the properties of water at stage 1 can be determined:

$P_{1}$ = 400 kPa

$T_{1}$ = 60°C

Therefore, from steam table:

specific volume $v_{1} = 0.001017 m^{3}/kg$

entropy $s_{1} = 0.8313 kJ/kg*K$

Calculating the specific volume of water after the partition is removed, since the mass is constant and volume of water is doubled:

$v_{2} = 2*0.001017 = 0.002034 m^{3}/kg$

Final pressure of water in the tank = $P_2} = 40 kPa$

dryness factor after removing the partition

$x = \frac{0.002034 - 0.001026}{3.993 - 0.001026} = 2.524*10^{-4} kg/vapor$

Therefore:

$s_{2} = s_{f2} + x*s_{fg2} = 1.0261 + (2.524*10^{-4}*6.643) = 1.02778 kJ/kg*K$

Thus, the entropy change is:

Δs = $m*(s_{2}-s_{1}) = 2.5*(1.02778 - 0.8313) = 0.4912 kJ/K$

Therefore, the entropy change of water is 0.4912 kJ/K

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4 years ago

Name at least 6 methods of seperation

coldgirl [10]

Answer:

Handpicking
Threshing
Winnowing
Sieving
Evaporation
Distillation
Filtration or Sedimentation
Separating Funnel
Magnetic Separation

Explanation:

You said at least 6 methods meaning I can give more than 6.

Hope it helps.

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3 years ago

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What is the solution to pollution?

dmitriy555 [2]

hi here is your answer hope it helps or then sry

Explanation:

The Solar Impulse Label is granted to innovative solutions to air pollution that meet high standards of sustainability and profitability.Each solution goes through a strict assessment process performed by independent experts.

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3 years ago

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