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1 year ago

Matter will come in two different types. What are they called?

Chemistry

2 answers:

Degger [83]1 year ago

5 0

Answer: They are called substances and mixtures

Explanation:

sergiy2304 [10]1 year ago

4 0

Answer:

pure substances and mixtures.

Explanation:

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.

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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 predator is typically found in Central Africa (but occasionally at geocode 34.043021, -118.2668356) and slays its opponent

noname [10]

I believe it is a black mamba.

6 0

2 years ago

Help me with this please

Gala2k [10]

Answer:

Gap 1, S-Phase, Gap 2, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis

Hope this helps.

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2 years ago

A + heat -> B endothermic reaction ΔH (+)

cupoosta [38]

The best and most correct answer among the choices provided by your question is the second choice.

<span>Based on the reaction given above, as the temperature decreases, the formation of the reactants will increase.</span>

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

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2 years ago

Some of Earth layers are not solid and are able to flow true or false

aalyn [17]

Answer:

True?

can I have brainiest pls

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2 years ago