Choose from the following descriptions of solid:HCl(s)
(A) composed of macromolecules held together by strong bonds
(B) composed of atoms held together by delocalized electrons
(C) composed of positive and negative ions held together by electrostatic attractions
(D) composed of molecules held together by intermolecular dipole–dipole interactions
(E) composed of molecules held together by intermolecular London forces

Answers

Answer 1

Answer:

The solid HCl is composed of molecules held together by intermolecular dipole–dipole interactions. The significant electronegativity difference between H and Cl make the dipole -dipole force in between HCl molecules.

What is dipole - dipole force ?

Dipole -dipole forces arises between molecules of permanent dipole moment. Covalent compounds are formed between two non-metals through electron sharing .

When one atoms is highly electronegative compared to the other, the shared pair of electrons attracts more to the electronegative atom. Which make partial charge separation and the compound becomes polar.

Two polar molecules attracts each other through dipole -dipole forces. HCl is a polar compound. Thus, in HCl solid, HCl molecules are held together by dipole -dipole forces.

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Answer 2

Answer: pretty sure it's C!

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A camcorder has a power rating of 16 watts. If the output voltage from its battery is 8 volts, what current does it use?

Answers

The equation for power is,

Power $P = I * V$

Where P is power is Watts

I is current in Amperes

V is voltage in volts

Given, power of the camcorder = 16 Watts

Output voltage from its battery = 8 Volts

Calculating the current in Amperes from power and voltage,

$P = I * V$

$16 Watts = I * 8 Volts$

$I =(P)/(V)$

I = $(16 W)/(8 V)$

= 2 A

Therefore the current used will be 2 A.

Power is defined as product of current multiplying voltage, that is

P=I×V

Here, P is the power,

I is the current

While V is the voltage

Here,

P is 16 watt

V is 8 volt

I is the current, that needs to be determined,

Putting the values in the equation

16=I× 8

$I=(16)/(8)$

I=2

So, When a camcorder has a power rating of 16 watts. If the output voltage from its battery is 8 volts, what current is 2 A

__________ refers to the total energy of a system.

Answers

The internal energy refers to the total energy of a system. The enrgies are kinetic energy and potential energy of the system that makes up the whole energies of the system.

Enthalpy refers to the total energy of a system. Enthalpy is basically a thermodynamic unit of measurement that determines the total heat content of a system. This means that all energy is included in the measurement - the energy used to make the system, the energy of the system, and the energy it uses to keep the environment separate from the system.

The half-life of thorium-227 is 18.72 days. How many days are required for three-fourths of a given amount to decay?I'm not quite sure how to set it up to even start working it? help would be appreciated! Thanks!!

Answers

t½=18.72days
therefore t¾=18.72+½ of 18.72
we have 18.72+9.36=28.08days

What makes hydrogen peroxide a polar molecule?

Answers

C. polar bonds and asymmetrical structure
If the molecule contains polar bonds but it has a symmetrical structure, the polar bonds will cancel each other out so the overall molecule will be non-polar.
On the other hand, if the molecule contains polar bonds but has an asymmetrical structure, then the polar bonds won't cancel each other out, so the overall molecule ends up being polar.

List two general properties of molecular compounds

Answers

Molecular compounds often have lower melting and boiling points. Ionic compounds cannot conduct electricity when they are in a solid form.

What are molecular compounds?

Any substance made up of similar molecules with atoms from two or more different chemical elements is referred to as a chemical compound. Atoms from more over 100 specific chemical elements, both in their pure forms and when mixed to form chemical compounds, make up all matter in the universe.

For instance, the atoms that make up carbon differ from those which make it up iron, which differ from the ones that make up gold. Molecular compounds often have lower melting and boiling points. Ionic compounds cannot conduct electricity when they are in a solid form.

Therefore, molecular compounds often have lower melting and boiling points. Ionic compounds cannot conduct electricity when they are in a solid form.

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Low melting points and boiling points. ...Low enthalpies of fusion and vaporization These properties are usually one or two orders of magnitude smaller than they are for ionic compounds.Soft or brittle solid forms. ...Poor electrical and thermal conductivity.

In a 1.0x10^-4 M solution of HClO(aq), identify the relative molar amounts of these species:HClO, OH-, H3O+, OCl-, H2O

Answers

HClO is a weak acid, which means the ions do not fully dissociate. The hydrolysis reaction for the hypochlorous acid is:

HClO + H2O ⇄ H3O+ +OCl-

Then the equilibrium constant, Ka, of dilute HClO would be:

$K_(a) = ([ H_(3) O^(+) ][O Cl^(-) ])/(HClO)$

Then we do the ICE table. I is for the initial concentration, C for the change and E for the excess.

HClO + H2O ⇄ H3O+ + OCl-
I 1.0x10^-4 0 0
C -x +x +x
E (1.0x10^-4 - x) x x

Substituting the excess (E) concentration to the Ka equation:

$K_(a) = ([x ][x])/(1.0 \ x \ 10^(-4) - x )$

Simplifying the equation would yield a quadratic equation:

$x^(2) + K_(a)x-(1.0 \ x \ 10^(-4)) K_(a)=0$

The Ka for HClO is an experimental data which was determined to be 2.9 x 10^-8. Substitute this to the equation, determine the roots, then you get the value for x, which is the concentration of H3O+ and ClO-. Just use your calculator feature Shift-Solve.

x = 1.688 x 10^-6 M = [H3O+] = [ClO-]

Then, you can determine the conc of [OH-] through pH.

pH = -log {H3O+] = -log [1.688 x 10^-6] = 5.77
pOH = 14 - pH = 14 - 5.77 = 8.23
pOH = 8.23 = -log [OH-]
[OH-] = 5.89 x 10^-9 M

Also, since HClO is (1.0x10^-4 - x), then it's concentration would be:
[HClO] = 1.0x10^-4 - 1.688 x 10^-6 = 9.83 x10^-5 M

Let's summarize all concentrations:
[HClO] = 9.83 x10^-5 M
[OH-] = 5.89 x 10^-9 M
[H3O+] = [ClO-] = 1.688 x 10^-6 M
Since the solution is dilute, H2O is relatively higher in concentration.

Thus in relative amounts, the order would be

H2O >>> HClO > H3O+ = ClO- > OH-

The Formula is:

Molar Mass of an Element = x Relative mass of atoms Molar mass constant (1g / mol)

Further Explanation

Understand molar mass

Molar mass = mass (in grams) of 1-mol substances

Molar mass is the mass (in grams) of one mole of a substance. By using the atomic mass of an element and multiplying it by the conversion factor of grams per mole (g / mol), you can calculate the molar mass of the element.

Look for the relative atomic mass of elements

Relative atomic mass:

Hydrogen = 1,007

Carbon = 12.0107

Oxygen = 15,9994

Chlorine = 35,453

The relative atomic mass of an element is the average mass of a sample of all its isotopes in atomic units. This information can be found in the periodic table of elements.