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3 years ago

Viscosity is the tendency of a solid to melt to a liquid. TRUE FALSE

Chemistry

2 answers:

bonufazy [111]3 years ago

7 0

Answer:

False

Explanation:

The temperature at which solid changes into liquid is known as the melting point.

Energy is required for a solid to melt into a liquid.

However viscosity is known as friction in liquids. It is the force that opposes movements in liquid. Viscosity causes liquids to be sticky. It is measured as a force per unit area.

As such, melting is the change from solid to liquid and not viscosity.

The answer is thus false.

LUCKY_DIMON [66]3 years ago

4 0

<span>The statement about “Viscosity is the tendency of a solid to melt to a liquid” is false. It is melting not viscosity. Viscosity is the tendency of how the fluids flow.</span>

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Consider the following reaction where Kc = 6.50×10-3 at 298 K: 2NOBr(g) 2NO(g) + Br2(g) A reaction mixture was found to contain

Aleks [24]

Answer:

This reaction isn't yet at an equilibrium. It must shift in the direction of the reactant (namely $\rm NOBr\; (g)$ ) in order to reach an equilibrium.

For this mixture, the reaction quotient is $Q_c = 0.0126$ .

Explanation:

A reversible reaction is at equilibrium if and only if its reaction quotient $Q_c$ is equal to the equilibrium constant $K_c$ .

Start by calculating the equilibrium quotient $Q_c$ of this reaction. Given the reaction:

$\rm 2\; NOBr\; (g) \rightleftharpoons 2\; NO\; (g) + Br_2\; (g)$ .

Let $[\mathrm{NOBr\; (g)}]$ , $[\mathrm{NO\; (g)}]$ , and $[\mathrm{Br_2\; (g)}]$ denote the concentration of the three species. The formula for the reaction quotient of this system will be:

$\displaystyle Q_c = \frac{[\mathrm{NO\; (g)}]^2 \cdot [\mathrm{Br_2\; (g)}]}{[\mathrm{NOBr\; (g)}]^2}$ .

(Note, that in this formula, both $[\mathrm{NO\; (g)}]$ and $[\mathrm{NOBr\; (g)}]$ are raised to a power of two. That corresponds to the coefficients in the balanced reaction.)

Calculate the reaction quotient given the concentration of each species:

$\displaystyle Q_c = \frac{[\mathrm{NO\; (g)}]^2 \cdot [\mathrm{Br_2\; (g)}]}{[\mathrm{NOBr\; (g)}]^2} \approx 1.26\times 10^{-2} = 0.0126$ .

(Note that the unit is ignored.)

Apparently, $Q_c > K_c$ . Since $Q_c$ and $K_c$ are not equal, this reaction is not at an equilibrium. If external factors like temperature stays the same,

Keep in mind that $Q_c$ denotes a quotient. To reduce the value of a quotient, one may:

reduce the value of the numerator,
increase the value of the denominator, or
both.

In $Q_c$ , that means reducing the concentration of the products while increasing the concentration of the reactants. In other words, the system needs to shift in the direction of the reactants before it could reach an equilibrium.

8 0

4 years ago

How many moles are in 55 g or NaCk

seraphim [82]

Answer:

Explanation:

Ok, so I suppose you meant NaCl. But ok:

So we have the formula moles = grams/MM, where MM is molar mass. The molar mass of NaCl is 58.44 g/mol. That means that 55/58.44 is the number of moles which appears to be 0.94 moles.

4 0

3 years ago

Water is considered neutral and has a pH of:

Brums [2.3K]

Answer:

Water has a pH of 7 - its not acid or base (its neutral {in the middle})

Explanation:

Since the pH scale maximum number is 14, the middle number - is 7 - which is where water is

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3 years ago

Which element would be the most conductive and

Masja [62]

Malleability described the property of physical deformation under some compressive stress; a malleable material could, for example, be hammered into thin sheets. Malleability is generally a property of metallic elements: The atoms of elemental metals in the solid state are held together by a sea of indistinguishable, delocalized electrons. This also partially accounts for the generally high electrical and thermal conductivity of metals.

In any case, only one of the elements listed here is a metal, and that’s copper. Moreover, the other elements (hydrogen, neon, and nitrogen) are gases under standard conditions, and so their malleability wouldn’t even be a sensible consideration.

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3 years ago

Read 2 more answers

A 25.888 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 73.464 g of wa

brilliants [131]

Answer:

Weight % of NH₃ in the aqueous waste = 2.001 %

Explanation:

The chemical equation for the reaction

$\\\\NH_3} + HCl -----> NH_4Cl$