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1 year ago

7

Is this correct?? please help

1 answer:

NeTakaya1 year ago

4 0

Yes it is but I have to check so wait

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A ___________________________ is made of two or more different substances.

Dmitry [639]

Mixture/ compound
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2 years ago

Of the following choices, pick all that are uses for radiation. Check all that

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A B C these are the answers hopes this help <3

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2 years ago

What is the number of protons in the nucleus of the atom

aleksklad [387]

Answer: It depends on the element.

Explanation: Every element has a different amount of protons in its nucleus. It is the same as its atomic number on the periodic table. For example: Hydrogen has an atomic number of 1 because it has 1 proton in its nucleus, Helium has 2, Carbon has 6, Platnium has 78, and so on...

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1 year ago

A 1.28-kg sample of water at 10.0 °C is in a calorimeter. You drop a piece of steel with a mass of 0.385 kg at 215 °C into it. A

Kryger [21]

Answer:

$T_{2}=16,97^{\circ}C$

Explanation:

The specific heats of water and steel are

$Cp_{w}=4.186 \frac{KJ}{Kg^{\circ}C}$

$Cp_{s}=0.49 \frac{KJ}{Kg^{\circ}C}$

Assuming that the water and steel are into an <em>adiabatic calorimeter</em> (there's no heat transferred to the enviroment), the temperature of both is identical when the system gets to the equilibrium $T_{2}_{w}= T_{2}_{s}$

An energy balance can be written as

$m_{w}\times Cp_{w}\times (T_{2}- T_{1})_{w}= -m_{s}\times Cp_{s}\times (T_{2}- T_{1})_{s}$

Replacing

$1.28Kg\times 4.186\frac{KJ}{Kg^{\circ}C}\times (T_{2}-10^{\circ}C)= -0.385Kg\times 0.49 \frac{KJ}{Kg^{\circ}C} \times (T_{2}-215^{\circ}C)$

Then, the temperature $T_{2}=16,97^{\circ}C$

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2 years ago

The chemical analysis of a compound gave the percentage composition by mass: Carbon 40%, Hydrogen 6.67% and Oxygen 53.3%. The re

cricket20 [7]

Answer:

C6H12O6

Explanation:

I attached the method for solving above.

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2 years ago