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2 years ago

The density of gold is 19.32. Give two reasons why this statement is incomplete

Chemistry

2 answers:

makvit [3.9K]2 years ago

6 0

<u>Answer:</u> The units and conditions are not written.

<u>Explanation:</u>

Density is defined as the ratio of mass of a substance to the volume of substance. The equation used to calculate density of a substance follows:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

This property is expressed in g/mL or kg/L

Density depends on temperature and pressure of the system.

As, the temperature of the system increases, the particles move freely which increases the volume of system and leads to the decrease of density.

As, the pressure of the system increase, the particles come closer to one another which decreases the volume of system and leads to the increase of density.

So, for the given value of density, two reasons are:

Units are not given.
Conditions are not mentioned.

DerKrebs [107]2 years ago

3 0

A: there is no unit. b: it doesn't present the temperature and pressure

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ASSERTION AND REASON DIRECTION : In the following questions, a statement of assertion (A) is followed by a statement of reason (

UkoKoshka [18]

Answer:

1) A

2) D

3) A

4) B

5) D

6) C

7) B

8) A

9) C

10) C

Explanation:

Sublimation refers to the direct change of a substance from solid to gas without passing through a liquid stage. Hence if camphor changes directly from solid to gas, camphor is a sublime substance.

Gases have a higher rate of diffusion than liquids because liquids have greater intermolecular forces while the intermolecular forces in a gas is negligible.

When a substance is heated, a point comes in which heat is supplied but the temperature of the body does not change. This is the point of phase change and the heat supplied at this point may be referred to as latent heat of fusion or vaporization depending on the particular process going on.

While it is true that evaporation occurs at all temperatures and the kinetic energy of molecules is directly proportional to the temperature of a body but the later statement does not explain the former. Rather evaporation occurs because some particles at the surface of the liquid are more energetic and escape due to unbalanced attractive forces acting on them.

Due to decrease in temperature, it takes a longer time to cook food at high altitudes but a lesser time to boil water at higher altitudes.

Gases are easily compressible by applying pressure because gases occupy negligible volume compared to the volume of the container. There is a significant inter particle space between gas particles.

The solid state contains the strongest degree of intermolecular forces. However, the reason offered, though correct, is not the correct explanation of the assertion stated.

This is the Tyndall effect. Colloidal particles scatter light rays and the path of the light becomes visible in the colloidal solution.

Salt solution is homogeneous. A homogeneous solution contains only one phase throughout. If it has a different composition, the solution is heterogeneous. Hence the explanation is false.

A true solution will not exhibit Tyndall effect because the particles are less than colloidal size. A true solution cannot be a heterogenous mixture hence the reason is false.

5 0

2 years ago

Consider the following reactions and their respective equilibrium constants: NO(g)+12Br2(g)⇌NOBr(g)Kp=5.3 2NO(g)⇌N2(g)+O2(g)Kp=2

maxonik [38]

Answer:

Equilibrium constant of the given reaction is $1.3\times 10^{-29}$

Explanation:

$NO+\frac{1}{2}Br_{2}\rightleftharpoons NOBr$ .... $(K_{p})_{1}=5.3$

$2NO\rightleftharpoons N_{2}+O_{2}$ .... $(K_{p})_{2}=2.1\times 10^{30}$

The given reaction can be written as summation of the following reaction-

$2NO+Br_{2}\rightleftharpoons 2NOBr$

$N_{2}+O_{2}\rightleftharpoons 2NO$

......................................................................................

$N_{2}+O_{2}+Br_{2}\rightleftharpoons 2NOBr$

Equilibrium constant of this reaction is given as-

$\frac{[NOBr]^{2}}{[N_{2}][O_{2}][Br_{2}]}$

$=(\frac{[NOBr]}{[NO][Br_{2}]^{\frac{1}{2}}})^{2}(\frac{[NO]^{2}}{[N_{2}][O_{2}]})$

$=\frac{(K_{p})_{1}^{2}}{(K_{p})_{2}}$

$=\frac{(5.3)^{2}}{2.1\times 10^{30}}=1.3\times 10^{-29}$

7 0

2 years ago

Read 2 more answers

Identify factors that account for the high phosphoryl‑transfer potential of the nucleoside triphosphates, NTPs.

lesantik [10]

Answer:

B) stabilization by hydration

C) resonance stabilization

E) increase in entropy

Explanation:

The high phosphoryl potential of ATP results from structural differences that exist between ATP and it's product of hydrolysis. There is higher phosphoryl transfer potential from ATP than glycerol 3-phosphate.

There are some factors associated to the high phosphoryl-transfer potential of ATP which are;

1.)Electrostatic repulsion

2.) Resonance stabilization

3.) Increase in entropy.

4. Stabilization by hydration.

ATP has a phosphoryl-transfer potential which lyes between high phosphoryl-potential compounds that is a derivation of fuel molecules and acceptor molecules that needs the adequate addition of a phosphoryl group for cellular needs.

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2 years ago

Oxide formation by heating element in oxygen atmosphere are best classified as which type of reaction?a. Synthesis b. Double dis

Bond [772]

Answer: a. Synthesis

Explanation:

a. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

Example: $Mg+O_2\rightarrow 2MgO$

Thus magnesium in its elemental form is combining with oxygen to form magnesium oxide.

b. Double displacement reaction is one in which exchange of ions take place.

Example: $2NaOH(aq)+(NH_4)_2SO_4(aq)\rightarrow 2NH_4OH(aq)+Na_2SO_4(aq)$

c. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

Example: $Li_2CO_3\rightarrow Li_2O+CO_2$

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2 years ago

When the Modern Museum of Art separated its consumers by whether they were culture-oriented or outdoor-oriented for its new exhi

madam [21]

Answer:

A. psychographic lifestyle segmentation

Explanation:

Psychographic lifestyle segmentation -

It refers to the distribution or classification method , where the consumers of a particular goods and services are classified into particular groups , depending on the psychological characteristics of the consumers , is referred to as psychographic lifestyle segmentation .

The segmentation take care of the consumers celief , priority , va;ues , decision - making process , lifestyle .

The method enables to market the goods and services in a better manner , nd increases the profit of the company .

Hence , from the given scenario of the question ,

The correct option is A. psychographic lifestyle segmentation .

8 0

2 years ago