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DanielleElmas [232]
4 years ago
8

Which of the following temperature is the coldest:

Chemistry
2 answers:
Vaselesa [24]4 years ago
8 0
1 -20 degree celsius
BartSMP [9]4 years ago
4 0
1- 20 degree celsius
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Which statement about the relationship between laws, hypotheses, and theories is true?
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If a hypothesis is not contradicted after a lot of testing it may be considered a law
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If 44.7 g of KCI (MM = 74.55 g/mol) are added to a 500.0 mL volumetric flask, and water is added to fill the flask, what is the
navik [9.2K]

1.199 M is the concentration of KCI in the resulting solution.

<h3 /><h3>What are moles?</h3>

A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

No.of moles of KCI

Moles = \frac{mass}{molar \;mass}

Moles = \frac{44.7 g}{74.5513 g/mol}

= 0.599 moles

Vol.of the solution,V= 500 ml

= 0.5 liter

Molarity

Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}

Molality = \frac{0.599 moles}{0.5 liter}

= 1.199 M

Hence, 1.199 M is the concentration of KCI in the resulting solution.

Learn more about moles here:

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2 years ago
A student made the table shown to list some contact and non contact forces
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Ok and? What happened? Where is the question
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The pressure of a gas in a tank is 3.20 ATM at 22.0°C if the temperature is increased to 60.0°C what will the new pressure in th
ruslelena [56]

Answer:

P₂ = 3.61 atm

Explanation:

Given data:

Initial pressure of tank = 3.20 atm

Initial temperature = 22.0°C

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Final temperature = 60.0°C (60 +273 = 333)

According to Gay-Lussac Law,

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Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

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P₂ = 3.20 atm × 333 K / 295 K

P₂ = 1065.6 atm. K /295 K

P₂ = 3.61 atm

3 0
3 years ago
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Imine formation from an aldehyde and an amine proceeds reversibly under slightly acidic conditions. The reaction is reversible d
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Answer:

Imine can be isolated from the reaction mixture as water is continuously removed from the reaction chamber

Explanation:

In this reaction, a non -aqueous solvent  is not used (not mentioned in the question). Thus, we can say that there is continuous removal water under suitable reacting conditions and hence the imine formed is left behind.

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