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4 years ago

Help with all of them please

Chemistry

1 answer:

denis23 [38]4 years ago

6 0

Hi,
The first answer is B. Ammonia has a pH value more than 7 and lemon juice has a pH value less than 7, as ammonia is a base and lemon juice is acid.
The second answer is A. Highly basic, as sodium hydroxide is a strong base.
The third answer is A. 5, since acids have a pH value less than 7.
The fourth answer is C. It is acidic, because carbon dioxide is soluble in water so the water's pH value decreases as carbon dioxide has a pH value less than 7.

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Anestetic [448]

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3 years ago

The same amount of energy is required to remove each electron sequentially from an atom.

77julia77 [94]

Ionization energy, also called ionization potential, in chemistry, the amount of energy required to remove an electron from an isolated atom or molecule.

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4 years ago

Determine the Ka for CH3NH3+ at 25*C. The Kb for CH3NH2 is 4.4 x 10-4.

vfiekz [6]

Answer:

Ka= 2.3 x 10^-11

Explanation:

so Ka x Kb = Kw where Kw=10^-14 at 25 degrees Celsius

plugging in Kb and Kw, we have

Ka x 4.4 x 10^-4 = 10^-14

solving for Ka,

Ka= (10^-14)/(4.4 x 10^-4)

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8 0

3 years ago

2 The substance has a mass of 0.50 kg.

katen-ka-za [31]

Answer:

68000J/kg

Explanation:

Given parameters:

Mass of the substance = 0.5kg

Quantity of heat transferred to the body = 34000J

Unknown:

Specific latent heat of fusion = ?

Solution:

The specific latent heat is usually involve in phase changes;

H = mL

H is the quantity of heat supplied

m is the mass

L is the specific latent heat

Insert the parameters and solve;

34000 = 0.5 x L

L = $\frac{34000}{0.5}$ = 68000J/kg

5 0

3 years ago

How many atoms does NH4Br have

Shalnov [3]

Answer:

Explanation:

bromine has 1, hydrogen has 4 and nitrogen has 1 therefore equaling 6

5 0

3 years ago

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