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Gennadij [26K]
3 years ago
6

In your own words, what do you think an atom is?

Chemistry
1 answer:
Lelu [443]3 years ago
5 0

Answer:

An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

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Using your value of Ksp, and starting with an equilibrium system consisting of a saturated solution of calcium hydroxide, predic
Ugo [173]

Answer:

(A) HNO_{3} Solubility will increase.

(B) NaOH Solubility will decrease.

(C) Ca(NO_{3} )_{2} Solubility will decrease.

Explanation:

a) According to Le Chatelier's Principle when a change is introduced in a reaction system at equilibrium, the system responds by the reaction shifting in the direction to counter the change introduced.

When the change introduced is addition of acid, some OH^{-} are consumed due to it and the system would respond by reaction shifting towards creation of more OH^{-} in the system by increased dissolution. Thus solubility increase.

(b) When OH^{-} are added, the reaction shifts to counter the change introduced of increased OH^{-} by shifting to side that decreases the increased OH^{-}. That happens by reaction shifting towards some Ca (OH)_{2} precipitating back. Hence solubility decreases.

(c) The change introduced is addition of Ca^{2+} which will be countered by reaction shifting to side that decreases increased Ca ^{2+}, which happens by some Ca(OH)_{2} precipitating back. Hence solubility decreases.

6 0
4 years ago
in general, as the temperature increases, the solubility of gases in water ____ and the solubility of most solids in water___
saul85 [17]

Answer:

in general, as the temperature increases, the solubility of gases in water <u>decreases</u> and the solubility of most solids in water <u>increases</u>.

4 0
3 years ago
How many moles of nitrogen we have at a temperature of 30 ºC, a pressure of 4.0 atm, and a volume of 4000.mL?
Irina-Kira [14]

Answer:

0.643 mol.

Explanation:

  • We can use the general law of ideal gas: <em>PV = nRT.</em>

where, P is the pressure of the gas in atm (P = 4.0 atm).  

V is the volume of the gas in L (V = 4000 mL = 4.0 L).  

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),  

T is the temperature of the gas in K (T = 30ºC + 273 = 303 K).

<em>∴ n = PV/RT </em>= (4.0 atm)(4.0 L)/(0.0821 L.atm/mol.K)(303 K) = <em>0.643 mol.</em>

5 0
4 years ago
Salt water is classified as a
julsineya [31]
Salt Water is classified as a:

4) mixture because the proportion of its components can vary.

Salt water is composed of salt and water.  Regardless of the amount of salt or water put together, these two still form salt water.
7 0
3 years ago
Read 2 more answers
How many centuries are in a foot ?
N76 [4]

Answer:

30 centimeters

Explanation:

I really hope you meant centimeters or I'm gonna look pretty dumb

5 0
3 years ago
Read 2 more answers
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