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Marina CMI [18]
3 years ago
9

Help please !!!!!!!!!!

Chemistry
1 answer:
wolverine [178]3 years ago
3 0
A lewis dot diagram shows only outer valence electrons and the bohr rutherford diagram shows all the electrons. :)
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This graph represents a population of molecules in a gas versus the distribution of the average velocity(speed) of its molecules
pshichka [43]

Answer:

Part A

Given that the graph is symmetrical and bell shaped, the average kinetic energy is given by the midline of graph, which corresponds to the common speed of the highest number of the population

Part B

The formula for the average kinetic energy, K.E. = (3/2)·(R/NA)·T

Therefore, the part of the graph that indicates the temperature of the sample is the average kinetic energy. K.E.

Part C

At a lower temperature, the heat is less evenly distributed and we have the distribution T2 higher than T1

Please see the attached graph created with MS Visio

Explanation:

3 0
3 years ago
Barium (Ba) is an alkaline earth metal.<br><br>t or f
tatiyna

Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element. Thanks and I hope it helped.

8 0
4 years ago
Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid.
Vlada [557]

Answer:  All of the statements (A-D) are false

Explanation: All of the given statements are wrong as Hydrogen bonds are weaker than the ionic and the covalent bonds.

Liquid water is more dense than the solid water.

When heat or temperature is provided to the system of the ice, not only covalent bonds are broken but also hydrogen bonds also get broke.

Energy must not be given off in order to break down the crytsal lattice of ice to a liquid. Infact in changing the phase of the water, energy is released.

8 0
3 years ago
Is the solubility of FeFe (OH)(OH) 33 increased, decreased, or unchanged on addition of each of the following substances? Write
Shalnov [3]

Answer:

a) solubility increases

b) solubility decreases

c) solubility increases

Explanation:

I) Fe^3+(aq) + 3Br^- --------> FeBr3 (aq) solubility increases

II) Fe^3+(aq) + 3OH^- ---------> Fe(OH)3(s) solubility decreases

III) Fe^3+(aq) + 6CN^- -----------> [Fe(CN)6]^3- (aq) solubility increases

The ionic equations shown above shows the possible changes in solubility when Fe(OH)3 is added to each of the solutions mentioned in the question.

8 0
3 years ago
How much water needs to be added
Olegator [25]

Answer:

165 ml

Explanation:

We are given;

Initial volume; V_a = 55 ml

Initial molarity; M_a = 3 M

Molarity of desired solution; M_b = 0.75 M

Volume of desired solution; V_b = (55 + x) ml

Where x is the volume of water to be added.

To solve for V_b, we will use the equation ;

M_a•V_a = M_b•V_b

V_b = (M_a•V_a)/M_b

V_b = (3 × 55)/0.75

V_b = 220 mL

Thus;

(55 + x) = 220

x = 220 - 55

x = 165 mL

8 0
3 years ago
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