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3 years ago

Using this density column, list the substances in order from most dense to least dense.

Chemistry

2 answers:

dybincka [34]3 years ago

6 0

The answer is C, Air is the least dense, water has be before oil because of polarity reasons and has a low density too

Sati [7]3 years ago

3 0

Answer: Option (c) is the correct answer.

Explanation:

Property of a substance to resist the flow of motion is known as viscosity. And, more is the density of a substance more will be its viscosity.

Whereas, lesser is the density of a substance then it is easy for the substance to move.

For example, density of oil is less than the density of water that is why, oil is able to float on the surface of water.

And, air being a gas will be able to move easily from one place to another because there is weak force of attraction between its molecules.

Thus, we can conclude that substances in order from most dense to least dense are as follows.

syrup > water > oil > air

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If five moles of a gas at a pressure of 5.4 kpa have a volume of 120 liters, what is the temperature?

ra1l [238]

<h3>The temperature is 15.58 kelvin </h3>

<em><u>Solution:</u></em>

<em><u>Ideal gas equation is given as:</u></em>

$PV = nRt$

Where,

P = pressure

V = volume

n = amount of substance

R = ideal gas constant

T = temperature

From given,

V = 120 liters

n = 5 moles

$R = 8.314\ \frac{Lkpa}{mol\ K}$

P = 5.4 kPa

T = ?

Therefore,

$5.4 \times 120 = 5 \times 8.314 \times T\\\\648 = 41.57 \times T\\\\T = 15.58\ kelvin$

Thus the temperature is 15.58 kelvin

4 0

3 years ago

Br NaOCH2CH3 + CH3CH-OH + NaBr CH3 CH3 a. Identify the mechanism of the reaction. b. Suggest steps for the mechanism of this rea

Ulleksa [173]

Answer:

a) The mechanism of the reaction is the Elimination Bimolecular or E2.

b) Steps for the mechanism of this reaction is given as follows,

c) Reaction rate = K[Organic compound][ $NaoCH_{2} CH_{3}$ ].

Explanation:

a) The mechanism of the reaction is the Elimination Bimolecular or E2.

c) This is an E2 reaction, so it depends on the concentration of both substrate and reactant. If we increase the concentration of $NaoCH_{2} CH_{3}$ , the reaction rate will be increased.

Reaction rate = K[Organic compound][ $NaoCH_{2} CH_{3}$ ].

b) Steps for the mechanism of this reaction is given as follows,

3 0

3 years ago

How many moles of potassium oxide (K2O) will be formed when 1.52 moles of potassium reacts with oxygen according to the followin

Ghella [55]

The balanced chemical reaction is given above however I believe the coefficients are wrong. It should be:

4K + O2 = 2K2O

We use data from that reaction to obtain relationships between substances. We are given the amount of potassium that reacts. We proceed as follows:

1.52 mol K ( 2 mol K2O / 4 mol K ) = 0.76 mol of K2O is formed

6 0

4 years ago

A chemist prepares a solution of vanadium chloride by measuring out of into a volumetric flask and filling to the mark with dist

user100 [1]

The question is incomplete, the complete question is:

A chemist prepares a solution of vanadium (III) chloride (VCl3) by measuring out 0.40g of VCl3 into a 50.mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Cl− anions in the chemist's solution. Be sure your answer is rounded to the correct number of significant digits.

Answer:

0.153M of anions

Explanation:

First we calculate the concentration of the solution. From m/M= CV

m=given mass, M= molar mass, C =concentration of solution, V= volume of solution

Molar mass of compound= 51 + 3(35.5)= 157.5gmol-1

0.4g/157.5gmol-1= C×50/1000

C= 2.54×10-3/0.05= 0.051M

But 1 mole of VCl3 contains 3 moles of anions

Therefore, 0.051M will contain 3×0.051M of anions= 0.153M of anions

4 0

3 years ago

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miss Akunina [59]

Answer:10^27 atoms in an apple

Explanation:

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3 years ago