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Mekhanik [1.2K]

3 years ago

10

A physical change in matter is a change in size and shape, (through cutting, breaking, or grinding), or state, (through melting,

boiling, freezing, evaporating, and condensing).
True
Or
False

1 answer:

mixas84 [53]3 years ago

4 0

Answer:

False

Explanation:

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G.P.E. on Earth is determined by an object's _______and _______

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Answer:

mass and height of the object.

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Animal that hunts and kills other animals for food. It is a consumer ( carnivore or omnivore )?

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What is the freezing point of a solution prepared from 45.0 g ethylene glycol (C2H6O2) and 85.0 g H2O? Kf of water is 1.86°C/m.

Andrews [41]

Answer:

$T_{sol}=-15.9\°C$

Explanation:

Hello,

In this case, we can analyze the colligative property of solutions - freezing point depression - for the formed solution when ethylene glycol mixes with water. Thus, since water freezes at 0 °C, we can compute the freezing point of the solution as shown below:

$T_{sol}=T_{water}-i*m*Kf$

Whereas the van't Hoff factor for this solute is 1 as it is nonionizing and the molality is:

$m=\frac{mol_{solute}}{kg\ of\ water}=\frac{45.0g*\frac{1mol}{62g} }{85.0g*\frac{1kg}{1000g} } =8.54m$

Thus, we obtain:

$T_{sol}=0\°C+(-8.54m*1.86\frac{\°C}{m} )\\\\T_{sol}=-15.9\°C$

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An element's atomic number is 63. How many protons would an atom of this element have?

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Atomic number of an element correlates to the number of protons an atom of that element will have. An atom of this element would have 63 protons.

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For water to change from a liquid to solid, thermal energy needs to be <br><br> .

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