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2 years ago

Is the study of matter and energy complete, or do you think there’s still new information to discover?

Chemistry

1 answer:

Vladimir [108]2 years ago

5 0

Answer:

Physical science, in turn, can be divided into chemistry and physics. Chemistry is the study of matter and energy at the scale of atoms and molecules. ... Physics is the study of matter and energy at all scales—from the tiniest particles of matter to the entire universe but i dont really know if there is new information to discover

Explanation:

hope it help and if it doesnt sorry ;)

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Answer:

Explanation:

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2 years ago

A buffer is prepared containing 0.75 M NH3 and 0.20 M NH4 . Calculate the pH of the buffer using the Kb for NH3. g

denis-greek [22]

Answer:

pH=8.676

Explanation:

Given:

0.75 M $NH_{3}$

0.20 M $NH_{4}$

The objective is to calculate the pH of the buffer using the kb for $NH_3$

Formula used:

$pOH=pka+log\frac{[salt]}{[base]}\\$

pH=14-pOH

Solution:

On substituting salt=0.75 and base=0.20 in the formula

$pOH=-log(1.77*10^{-5})+log\frac{0.75}{0.20}\\ =4.75+0.5740\\ =5.324$

pH=14-pOH

On substituting the pOH value in the above expression,

pH=14-5.324

Therefore,

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3 0

3 years ago

What quantity of sodium azide in grams is required to fill a 56.0 liters air bag with nitrogen gas at 1.00 atm and exactly 0 °C:

Margarita [4]

Answer:

108.6 g

Explanation:

2NaN₃(s) → 2Na(s) + 3N₂(g)

First we use the PV=nRT formula to calculate the number of nitrogen moles:

P = 1.00 atm

V = 56.0 L

n = ?

R = 0.082 atm·L·mol⁻¹·K⁻¹

T = 0 °C ⇒ 0 + 273.2 = 273.2 K

Inputting the data:

1.00 atm * 56.0 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 273.2 K

n = 2.5 mol

Then we convert 2.5 moles of N₂ into moles of NaN₃, using the stoichiometric coefficients of the balanced reaction:

2.5 mol N₂ * $\frac{2molNaN_3}{3molN_2}$ = 1.67 mol NaN₃

Finally we convert 1.67 moles of NaN₃ into grams, using its molar mass:

1.67 mol * 65 g/mol = 108.6 g

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2 years ago

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If the solvent-solute interactions are weaker than the average of the solvent-solvent and solute-solute interactions, then heat is absorbed from the surroundings and the overall mixing process is said to be endothermic process.

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The solvent - solute interaction < solute - solvent interaction \and the solute solute interaction then the solution may be or may not be formed.

Thus, then heat is absorbed from the surroundings and the overall mixing process is called as endothermic process.

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