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2 years ago

Please somebody help!!!!!!!!!!!!!

Chemistry

1 answer:

natta225 [31]2 years ago

4 0

Answer:

1.Materials

2. Hypothesis

3.Question

4.Procedure

5.Further questions

6.Results and Data

7.Conclusion

Explanation:

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Describe the energy of the water molecules for each states

DedPeter [7]

Answer:

In liquid water, hydrogen bonds are constantly being formed and broken as the water molecules slide past each other.

Explanation:

The breaking of these bonds is caused by the energy of motion (kinetic energy) of the water molecules due to the heat contained in the system.

(hope that helps) :)

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3 years ago

A piece of wood has a mass of 36g and measures 3cm X 6cm X 4cm. What is the density of the wood? Would the piece of wood float o

Fudgin [204]

Answer:

Explanation:

The density is

1.1 g c m 3 .

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2 years ago

A freezer compartment is covered with a 2-mm-thick layer of frost at the time it malfunctions. If the compartment is in ambient

ruslelena [56]

Answer:

The time required to melt the frost is 3.25 hours.

Explanation:

The time required to melt the frost dependes on the latent heat of the frost and the amount of heat it is transfered by convection to the air .

The heat transferred per unit area can be expressed as:

$q=h_c*A*\Delta T\\\\q/A=h_c*\Delta T$

being hc the convective heat transfer coefficient (2 Wm^-2K^-1) and ΔT the difference of temperature (20-0=20 °C or K).

$q/A=h_c*\Delta T=2\frac{W}{m^2K}*20K=40\frac{W}{m^2}$

If we take 1 m^2 of ice, with 2 mm of thickness, we have this volume

$V=T*A = 0.002 m * 1 m^2=0.002m^3$

The mass of the frost can be estimated as

$M=\rho * V=700\frac{kg}{m^3}*0.002m^3= 1.4 kg$

Then, the amount of heat needed to melt this surface (1 m²) of frost is

$Q=L*M=334\frac{kJ}{kg}*1.4kg= 467.6kJ$

The time needed to melt the frost can be calculated as

$t=\frac{Q}{(q/A)}=\frac{467.6kJ/m2}{40W/m2} = 11.69\frac{kJ}{W}*\frac{1W*s}{1J}*\frac{1000J}{1kJ}= 11690s=3.25h$

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2 years ago

Which animal can leave its eggs to hatch and does not need to take care of the infants?

Murljashka [212]

Sea turtles they leave them on the beach

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2 years ago

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What is the ultimate end of a high mass star that has a core about 2.8x the mass of our sun?

jolli1 [7]

Answer:

Explanation:

It is formed after the star has ended its star cycle into a supernova. The star collapsed into a neutron star that is smaller than the progenitor star but has inherited angular momentum. IT, therefore, spins faster emitting electromagnetic radiation that seems to pulsate.

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2 years ago

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