The strength of a weak base is indicated by its "ionization constant Kb." The greater the value of Kb, the _____ the base. a) Weaker b) Stronger c) More neutral d) Less reactive

Answers

Answer 1

Answer: Kb is known as the base dissociation constant and the larger the value of kb the stronger the base. However, at times the values of kb are very small when dealing with calculations of weak bases. Hence, pKb is often used. Pkb = -lg(Kb)

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Predict the products in the following reaction: AgNO3(aq) + Na2CrO4(aq) →

Answers

You expect Sodium Nitrate and Silver Chromate, just go ahead and make sure your complete reaction is balanced

Which of the following is a pure substance?a. soda
b.gun powder
c. sugar water
d. steam

Answers

Steam.A pure substance has an unchanging composition,water in the form of steam has an unchanging composition

At standard pressure, the total amount of heat required to completely vaporize a 100. gram sample of water at its boiling point is(1) 2.26 X 10 J (3) 2.26 X 103 J(2) 2.26 X 102 J (4) 2.26 X 105 J

Answers

During phase transformation Temperature remains same, as the extra heat goes into breaking the force of attraction between the particles. the correct option is option (4) that is 2.26×10⁵ J.

What is heat of vaporization?

Heat of vaporization is the amount of energy or heat that is required to break the force of attraction between the particles to convert liquid into vapors. Vaporization is an endothermic reaction. So the amount of energy that is required over here is positive. Heat of condensation is negative that is heat is released during reaction.

We know that the heat of vaporization of water is 2260 J/g. So, the total amount of heat required to completely vaporize a 100gram sample of water at its boiling point is 2260×00=2.26×10⁵ J.

Thus the correct option is option (4)

To know Moe about heat of vaporization, here:

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We know that the heat of vaporization of water is 2260 J/g. So 100 gram sample of water being completely vaporized needs 2260*100=2.26*10^5 J. So the answer is (4).

Which is the best example of technological design

Answers

Well, actually there are many examples. But, the one i know best is the touch mouse by Microsoft.

Calculate the density of a rectangular metal bar that is 7.00 cm long, 4.00 cm wide, and 1.00 cm thick and has a mass of 352 g is?

Answers

Density is mass divided by volume (d=m/v)
To calculate volume you multiply the length, width, and height of the object (v=lwh)
In this example, we get a product of 28
So 352/28 is 12.57142.... Round to the nearest decimal place indicated in your instructions or keep as is

Answer:

12.58 g/cm³

Explanation:

V = 7×4×1 = 28cm³

ρ = m/V = 352/28 ≈ 12.58 g/cm³

The solid and liquid phases of water can exist ina state of equilibrium at 1 atmosphere of pressure
and a temperature of
(1) 0°C (3) 273°C
(2) 100°C (4) 373°C

Answers

Answer: 0°C

Explanation:
Water undergoes phase changes at 1 atm pressure as follows:
Solidification, change from water to ice occurs at 0°C.
Evaporation, change from liquid to gas occurs at 100°C.

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