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lisabon 2012 [21]
2 years ago
12

The mass number of an atom is the number of

Chemistry
2 answers:
sergeinik [125]2 years ago
6 0

Answer:

protons plus neutrons

Explanation:

jsut the definition

AlexFokin [52]2 years ago
6 0

Answer:

protons

Explanation:

the sum of the numbers of protons and neutrons present in the nucleus of an atom

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Write the limiting forms (or Canonical forms) of the following ions:
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Answer:

Canonical structures of a chemical specie explain its observed properties from a valence bond theory perspective.

Explanation:

Resonance is a valence bond concept introduced by Linus Pauling to explain the observed properties of certain chemical species such as bond lengths, bond angles, bond order , etc.

There are certain chemical species for which a single chemical structure does not suffice in explaining its observed properties. For instance, the bond order in CO3^2- is about 1.33. Its bond length, shows that the C-O bond present in CO3^2- is neither a pure C-O single bond nor a pure C-O double bond. Hence the structure of CO3^2- is 'somewhere in between' three contributing canonical structures as shown in the image attached to this answer. The resonance structures of NO3^- are also shown.

3 0
2 years ago
Four acids are analyzed and their Ka values are determined. Which of the following values represents the strongest acid?
labwork [276]
Hi, thank you for posting your question here at Brainly. 

The acid dissociation constant, Ka, is an equilibrium constant that measure the strength of an acid. It is a ratio of the concentration of the products (salt and water) and the reactants (acid). The higher the Ka, the more tendency it is to favor the product side, which means more tendency to donate H+ ions. This is exactly the definition of a strong acid (high H+ ionized).

Thus, the answer is letter D.
4 0
3 years ago
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Please help!! I'll name you brainliest!!
SashulF [63]

Answer:

a) 1

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c) 7

d) 3

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4 0
2 years ago
How would you prepare 2.00 l of a 0.25 m acetate buffer at ph= 4.50 from concentrated acetic acid (17.4 m) and 1.00 m naoh? the
zvonat [6]

The reaction of acetic acid with sodium hydroxide is:

CH_3COOH + NaOH    CH_3COONa + H_2O

The ratio of A-/HA is calculated as follows:

According to Henderson Hasslebach equation:


[A-]/[HA] = 10^p^H^-^p^K^_a

= 10^4^.^7^6^-^4^.^5^ = ^2^.^1^8

The total concentration of HA and A- = 2.0 L * 0.25 M = 0.5 mol.

[ A- ]+ [ HA ]= 0.5

[ A^- ] = 0.5 – [ HA]

[ HA] = 0.156 mol and [ A- ]= 0.343 mol

Total of 0.5 moles of acetic acid is required:

0.5 mol HA * 60.0 g

HA = 30.0 g acetic acid

Conversion of 0.343 moles of the acetic acid to acetate can be performed by adding NaOH

0.343 mol HA * (1 mol NaOH/1 mol HA) * (1000 mL/1 mol NaOH)

= 343 mL  

Thus, 343 mL of 1M NaOH is required

3 0
2 years ago
What is the Ring of Fire?
sesenic [268]

Answer:

D: chain of volcanoes circling the Pacific Basin

Explanation:

5 0
3 years ago
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