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3 years ago

What is the atomic number of the atom

Chemistry

2 answers:

castortr0y [4]3 years ago

6 0

Answer:

The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus.

Explanation:

pls mark me as brainleast and folow me

frozen [14]3 years ago

4 0

An atomic number is the number above the element in a periodic table.
I’m not sure if that’s what you were asking, I was a bit confused on the wording.

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3. Determine the uses of the following materials:

hichkok12 [17]

Answer:

Explanation:

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3 years ago

A sample of nickel is heated to 99.8 degrees C and placed in a coffee cup calorimeter containing 150.0g water at 23.5 degrees C.

vesna_86 [32]

<u>Answer:</u> The mass of nickel that was originally heated is 28.4 grams.

<u>Explanation:</u>

When metal is dipped in water, the amount of heat released by metal will be equal to the amount of heat absorbed by water.

$Heat_{\text{absorbed}}=Heat_{\text{released}}$

The equation used to calculate heat released or absorbed follows:

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

$m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]$ ......(1)

where,

q = heat absorbed or released

$m_1$ = mass of nickel = ?

$m_2$ = mass of water = 150.0 g

$T_{final}$ = final temperature = 25.0°C

$T_1$ = initial temperature of nickel = 99.8°C

$T_2$ = initial temperature of water = 23.5°C

$c_1$ = specific heat of nickel = 0.444 J/g°C

$c_2$ = specific heat of water= 4.186 J/g°C

Putting values in equation 1, we get:

$m_1\times 0.444\times (25.0-99.8)=-[150.0\times 4.186\times (25.0-23.5)]$

$m_1=28.4g$

Hence, the mass of nickel that was originally heated is 28.4 grams.

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3 years ago

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Dana is trying to determine if an unknown sample is a pure substance or not. The sample has a cloudy white color, and it seems e

Firdavs [7]

Answer:

Dana filtered the sample and larger granules of the sample were left behind.

Explanation:

If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.

One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.

Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.

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3 years ago

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wariber [46]

Answer:

RESPONSIBLE:

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2. Alisha uses credible research to publish a report about the negative effects of getting insufficient sleep.

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1. Henry was selective in his use of data; he used only the data that supported his hypothesis.

2. Kevin combined data from two unrelated experiments in an effort to impress his instructor.

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4 years ago

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gogolik [260]

You could describe it's shape, color, varieties on sizes and shape of states, how it's rounded but with a top and bottom.

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4 years ago