CHEMISTRY HIGH SCHOOL

Which of the following has an incomplete octet in the lewis structure?A) SO2
B) ICl
C) CO2
D) F2
E) NO

how to get it?

Answers

Answer 1
Answer: "NO" is the one among the following choices given in the question that has an incomplete octet in the Lewis structure. The correct option among all the options that are given in the question is the fifth option or the last option or option "E". I hope that this is the answer that has come to your help.

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Which sample of matter is a mixture?
(1) Br2(ℓ) (3) KBr(s)
(2) K(s) (4) KBr(aq)

Answers

Answer:


               KBr (aq) is a mixture.


Explanation:

                       Mixture is defined as the combination of two non reacting species. Let's discuss each option one by one.


a) Br₂(l):

              This Bromine is not a mixture because the bracket specifying the state of Br₂ is liquid. Hence, as bromine is a liquid at room temperature, so this compound is purely Br₂.


b) KBr (s):

                KBr is also present in pure form because in bracket solid is written.


c) K (s):

              Potassium is also present in pure form as the bracket is specifying solid, as KBr is solid at room temperature.


d) KBr (aq):

                   This is a mixture of KBr and water. Because KBr being an electrolyte when dissolved in water it is hydrated as follow,


                             KBr (s) -----water------> K⁺ (aq) + Br⁻ (aq)

\boxed{\left( {\text{4}} \right){\text{ KBr}}\left( {aq} \right)} is a mixture.

Further explanation:

Mixture:

It is formed by the physical combination of two or more different substances. Mixtures do not have any fixed formula and their composition is also variable. There is retention in the properties of constituents even after the formation of mixtures.

(1){\text{B}}{{\text{r}}_2}\left( l \right)  

Bromine is present in liquid in its pure state. The “l” written in the parenthesis after   denotes its physical state which is the same as that of its pure form. So it is not a mixture.

(2) K (s)

Potassium is present in solid in its pure form. The “s” written in the parenthesis after K describes its physical state which is the same as that of its pure form. So it is not a mixture.

(3) KBr (s)

It is an ionic salt which is solid in nature. The “s” written in the parenthesis after KBr denotes its physical state which is the same as that of its pure form. So it is not a mixture.

(4) KBr (aq)

The “aq” written in the parenthesis after KBr indicates that it is present in the aqueous phase. This means it is formed by the combination of KBr and water so it is a mixture.

Learn more:

  1. The major contribution of Antoine Lavoisier to chemistry: brainly.com/question/2500879
  2. Example of physical change: brainly.com/question/1119909

Answer details:

Grade: High School

Chapter: Elements, compounds, and mixtures

Subject: Chemistry

Keywords: mixture, physical combination, substances, fixed formula, variable, composition, retention, properties, Br2, K, KBr.

Which atomic model was proposed as a result of J. J. Thomson’s work?

Answers

It should be the plum pudding model. c:

A 250-mL aqueous solution contains 1.56 mc025-1.jpg 10–5 g of methanol and has a density of 1.03 g/mL. What is the concentration in ppm?A 6.1 X 10^-8 ppm
B 1.5 X 1-^-5 ppm
C 0.061 ppm
D 15 ppm

Answers

The right answer for the question that is being asked and shown above is that: "B 1.5 X 1-^-5 ppm." A 250-mL aqueous solution contains 1.56 mc025-1.jpg 10–5 g of methanol and has a density of 1.03 g/mL. The concentration in ppm is that 1.5 X 1-^-5 ppm

Answer: The correct option is C.

Explanation: ppm is used to measure the concentration of solute in a given volume of solution. ppm is basically parts per million.

Mathematically,

ppm=\frac{\text{Mass of solute (in mg)}}{\text{Volume of solution (in L)}}

We are given:

Mass of methanol = 1.56* 10^(-5)g=1.56* 10^(-2)mg  (Conversion Factor : 1g = 1000mg)

Volume of solution = 250 mL = 0.250L   (Conversion Factor : 1L = 1000mL)

Putting values in above equation, we get:

ppm=(1.56* 10^(-2)mg)/(0.250L)

Concentration of methanol = 0.062ppm

Hence, the correct option is C.

Which electron dot diagram best represents a compound that contains both ionic and covalent bonds?

Answers