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4 years ago

Imagine you are standing in a kitchen and then

1 answer:

ozzi4 years ago

5 0

You would see mostly compounds because elements make compounds and with these elements making compounds you are most likely not going to see them and since your in the middle of the forest you won't see much mixtures as much as compounds since we create most mixtures. Hope this helps my dude ^^

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Consider the generic acid, HA, and how it interacts with water:HA (aq) + H2O (l) ⇌ H3O+ (aq) + A-Consider the following statemen

luda_lava [24]

Answer:

B. False

A. True

B. False in

Explanation:

From Bronsted-Lowrys definition of Acids and bases, a strong acid is a substance that gives up a proton (to form a weak conjugate base), while a strong base is one that willingly accepts a proton.

Therefore in the reaction,

HA(aq) + H2O (l) ⇌ H3O+ (aq) + A-

The stronger HA is, the weaker the A- and vice versa; the weaker HA is, the stronger A-. Example, HCl is a strong acid and its conjugate base, Cl- is a weak base.

B. False

Electron drawing groups are molecules and/or atoms that enable the release of a proton from a specie. They cause inductive as well as mesomeric effects. Examples, -NO2, -COOH, -OH etc.

Fluoride ion is the most stable in this series because it's the most electronegative while carbon is the least stable because it's the least electronegative. Because of this, we were able to say that H-F was the most acidic, because it had the most stable conjugate base.

A. True.

pKa1 = -log[Ka1]

= -log[1.2 x 10-4]

= 3.92

pKa2 = -log[Ka2]

= -log[1.5 x 10-8]

= 7.82

Using Bronsted-Lowry definition, the smaller the pKa value the more ease the acid loses its proton, that is, the smaller the pKa value, the stronger the acid.

Therefore, pKa2 > pKa1, so Ka value of 1.2 x 10-4 is a stronger acid than Ka value of 1.5 x 10-8

B. False.

7 0

4 years ago

Please help!!!!!!!!!!!!

Olin [163]

Answer:

Explanation:

Atomic number = 8

Electron = 8

1s level= 2

2nd level = 6

3rd level =0

Hope this help

6 0

3 years ago

Read 2 more answers

Convert 8.4 • 10^16 molecules of CO2 to moles

Degger [83]

Answer:

0.00000000000000084

Explanation:

8 0

3 years ago

Calculate the solubility in g/l of lead (ii) fluoride in water at 25 oc if ksp of pbf2 is 4. 1 x 10-8.

Tems11 [23]

The solubility in g/l of lead (ii) fluoride in water at 25°C if ksp of PbF2 is 4. 1 x 10-8. is 5.3 ×10^(-1).

When PbF₂ dissolves, it dissociates as follows;

PbF₂ --> Pb²⁺ + 2F⁻

If molar solubility of PbF₂ is x, then molar solubility of Pb²⁺ is x and F⁻ is 2x.

ksp is solubility product constant and it can be calculated as follows;

ksp = [Pb²⁺][F⁻]²

ksp = (x)(2x)²

ksp = 4x³

$4_{X} ^{3} = 4.1 * 10^{-8}\\\\ X^{3} = 1.025 * 10^{-8}\\\\ X = 0.092 * 10^{-3}\\ \\X = 2.1 * 10^{-3}$

To calculate solubility in terms of g/L, we have to know the molar mass of PbF₂.

Solubility of PbF₂ is $2.1 * 10^{-3}$ mol/L x 248 g/mol = $5.14 * 10^{-1}$ g/L

Thus, we concluded that the solubility of given solution is 5.14 × 10^(-1). which is approx 5.3 × 10^(-1).Hence option D is the correct option.

Learn more about solubility: brainly.com/question/14366471

#SPJ4

6 0

2 years ago

if 100.0 g of water at 90 deg. C is added to 50.0 g of water at 10 deg. C, estimate the final temperature of the water.

klemol [59]

When mixing substances, in order to find the final temperature after mixing, it is important to remember that the energy released should be equal to the energy absorbed by the system. We calculate as follows:

Q1 = Q2
(mCΔT)1 = (mCΔT)2
100 ( 90 - T ) = 50 ( T - 10 )
T = 63.33 °C

3 0

3 years ago