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2 years ago

Explain what a chemical reaction is and moles

Chemistry

1 answer:

Delvig [45]2 years ago

3 0

Answer:

A process during which chemical bonds between atoms are broken and new ones are formed, producing one or more substances.

Moles are the amount of substance that contains as many particles.

Explanation:

A chemical reaction is when a chemical change occurs for example when a nail comes into contact with air and is then exposed to air it begins to rust. It forms a red-brown substance which changes the chemical composition of the original compound.

Examples of chemical reactions:

Combustion

Oxidation (rusting)

Cooking an egg

Photosynthesis

Digestion

Fireworks

Paper Burnin

The mole is the amount of substance that contains as many particles (molecules, ions or atoms) as there are in 12g of carbon.

1 mol is the amount of substance that contains the same number of particles as there are atoms in 12.0 g of carbon-12 and that number is referred to as Avogardo's constant (6.022 x $10^{23}$ ).

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Which cellular process produces simple sugars?

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The answer is C. Hope this helps you out!

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3 years ago

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A drink is made up mostly of water. A small amount of sweet powder is stirred in using a spoon. The power in this solution is th

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3 years ago

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A beaker is filled to the 500 mL mark with alcohol. What increase in volume (in mL) does the beaker contain when the temperature

Aliun [14]

Answer:

"1.4 mL" is the appropriate solution.

Explanation:

According to the question,

$v_0=500$
$\alpha =1.12\times 10^{-4}$
$\Delta \epsilon = 25$

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Increase in volume will be:

⇒ $\Delta V = \alpha\times v_0\times \Delta \epsilon$

By putting the given values, we get

$=1.12\times 10^{-4}\times 500\times 25$

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3 years ago

Which statement about spontaneous and nonspontaneous processes is correct? Spontaneous processes are favored by a decrease in H,

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4 years ago

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How many of the following species are paramagnetic? sc3+ br- mg2+ se?

Aloiza [94]

Answer:
One: <u>Selenium</u> is Paramagnetic

Explanation:
Those compounds which have unpaired electrons are attracted towards magnet. This property is called as paramagnetism. Lets see why remaining are not paramagnetic.

Electronic configuration of Scandium;

Sc = 21 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹

Sc³⁺ = 1s², 2s², 2p⁶, 3s², 3p⁶

Hence in Sc³⁺ there is no unpaired electron.

Electronic configuration of Bromine;

Br = 35 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁵

Br⁻ = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶

Hence in Br⁻ there is no unpaired electron.

Electronic configuration of Magnesium;

Mg = 12 = 1s², 2s², 2p⁶, 3s²

Mg²⁺ = 1s², 2s², 2p⁶

Hence in Mg²⁺ there is no unpaired electron.

Electronic configuration of selenium;

Se = 34 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁴

Or,

Se = 34 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4px², 4py¹, 4pz¹

Hence in Se there are two unpaired electrons hence it is paramagnetic in nature.

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3 years ago