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2 years ago

Density is the amount of mass found in a given space. Which statements are true about mass and/or density?

Chemistry

2 answers:

wlad13 [49]2 years ago

5 0

A marble has more density than an inflated balloon.

Y_Kistochka [10]2 years ago

3 0

If two ball are placed in a tank of water

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How many atoms are in 0.0303 mol K?

Inga [223]

1.661x10 negative 24 squared

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2 years ago

A cooling curve has two flat lines, or plateaus. What does the plateau at the higher temperature represent?

blagie [28]

Answer:

It is in the state of "thermal arrest"

Explanation:

The temperature stays constant during the phase change process . This is because the matter has more internal energy and heat has to be taken away for the solidification process to begin. The energy that is required for a phase change is know as latent heat (which is the energy released or absorbed by a body during a thermodynamic process).

5 0

2 years ago

Read 2 more answers

A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg

Brut [27]

Answer: $1.0\times 10^2g$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-6.4-(13.6))^0C=7.2^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte like urea)

$K_f$ = freezing point constant = $3.96^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

$7.2=1\times 3.96\times \frac{xg}{60.06 g/mol\times 0.95kg}$

$x=1.0\times 10^2g$

Thus $1.0\times 10^2g$ urea was dissolved.

8 0

3 years ago

Near the surface of a liquid, fast-moving particles can break free and become a gas.

Nookie1986 [14]

This statement is True! Lets think about it... When water boils, the water doesnt evaporate from the bottom of the bowl it evaporates from the top!
=)

6 0

2 years ago

Elements are made up of one type of atom. Compounds are particles that have more than one atom joined together. They can be ....

Agata [3.3K]

Answer:

metal or non metal

Explanation:

this is the answer

4 0

1 year ago