Which substance can be described as cations bonded together by mobile electrons?a. S8(s)b. Ag(s)c. SiO2(s)d. KCl(s)e. Kr(l)

Answer:

Baking powder is combination of baking soda and an edible acid such as tartaric acid. When its added to water it reacts to form carbon dioxide. This carbon dioxide produces wet dough and makes cake soft and spongy

Answer:

The theoretical yield (in grams) of soap is 514.9 grams

Explanation:

Please see the attachments below

Answer:

Nitrogen

Explanation:

Hello,

In this case, for the given reaction we first need to assign the oxidation state for each species in the chemical reaction:

[tex]Sn ^{2+}(aq) + (N^{-3}H^+_4)^ +(aq) \rightarrow Sn^0(s) + (N^{5+}O_3^{2-})^ -(aq)[/tex]

In such a way, since the tin is decreasing its oxidation state it is being reduced whereas the nitrogen is being oxidized as its oxidation state is being increased from -3 to +5.

Best regards.

The element which is oxidized in the redox reaction shown below is Nitrogen.

Sn²⁺(aq) + NH⁴⁺(aq) → Sn(s) + NO₃⁻(aq)

In this scenario, the oxidation state of Sn changed from +2 to 0 while the

oxidation state of Nitrogen changed from -3 to +5.  The Nitrogen(N) present

in the equation experienced an increase in the oxidation state which means

it was oxidized.

The Tin(Sn) on the other hand experienced a reduction in the oxidation state

which means it was reduced.

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Answer:

1) HCl reagent was added in excess

Explanation:

The equation of the reaction is given as;

Zn + HCl --> ZnCl2 + H2

From the stoichiometry;

1 mol of Zn reacts with 1 mol of HCl

In 2g of Zn;

mass = 2

Molar mass = 65.38g/mol

Number of moles = Mass/ Molar mass = 2 / 65.38 = 0.03059 mol

In 10ml of HCl;

the number of moles is: moles = Concentration * Volume =  (10 moles/L) (0.0100 L) = 0.10 moles

Comparing 0.03059 mol  of Zn : 0.10 mol of HC with the stochiometry, we can deduce that HCl is by far greater. Hence the correct option is option 1.

Answers

1)  0.55 meters

2)  3500 millimoles

3)  1600 grams

4)  0.0025 kilograms

5)  40 millimeters

6)  5000 milliliters

7)  43200 seconds in 12 hours

    86400 seconds in 24 hours

HOPE THIS HELPS:)

Whoever made this needs to do it their self because this took lots of googling. I see that this was just a practice problem so if you have a test google has a great conversion tool, it gives answers right away.

Explanation:

Answer:

6.1 kg

Explanation:

To obtain the total mass of the sample, we must first express each mass of the sample in the same unit of measurement.

Since the SI unit of mass is kilogram (kg), we shall express the total mass of the samples in kilogram (kg).

This is illustrated below:

Mass of the samples are:

M1 = 0.6160959 kg

M2 = 3.225 mg

M3 = 5480.7 g.

Conversion of 3.225 mg to kg

1 mg = 1×10¯⁶ kg

Therefore,

3.225 mg = 3.225 × 1×10¯⁶

3.225 mg = 3.225×10¯⁶ kg

Conversion of 5480.7 g to kg

1000 g = 1 kg

Therefore,

5480.7 g = 5480.7 /1000

5480.7 g = 5.4807 kg

Thus, we can obtain the total mass of the samples as follow:

M1 = 0.6160959 kg

M2 = 3.225×10¯⁶ kg

M3 = 5.4807 kg

Total mass =?

Total mass = M1 + M2 + M3

Total mass = 0.6160959 + 3.225×10¯⁶ + 5.4807

Total mass = 6.096799125 ≈ 6.1 kg

Therefore, the total mass of the samples is approximately 6.1 kg.

Answer:

Explanation:

molecular weight of gold = 197

converting 10.2 g into moles

no of moles = 10.2 / 197

= .0518 moles

one  mole of any element contains 6.02 x 10²³ number of atoms

.0518 moles will contain 6.02 x .0518 x 10²³ atoms of gold

= .311 x 10²³ no of atoms of gold .

= 3.11 x 10²² no of atoms of gold

Answer:

New element formed by combination of reactants.

Explanation:

Synthesis refers to the production of a new product from the combination of two or more reactants. Analysis, synthesis, and evaluation are related to each other because in synthesis a new product is formed while in analysis, we examine the structure of the new product in detailed and in evaluation, we assess the quantity of a new product. So analysis and evaluation gives a lot of information about the product which is formed in synthesis.

Explanation:

5) Le Chatelier's principle says, when in a reversible reaction any of the concentration or temperature or pressure are changed, then the equilibrium shifts such a way to nullify the changes occurred. (hope you get it)

R ======= P

if concentration of reactant R is increased then eqm shifts towards the one with lower concentration ,that is product P.

forward direction is favoured.

if the above's reaction is endothermic, that is temp of product is low. So increasing temperature in such case reaction goes towards product.

forward direction is favoured.

If reaction is exothermic ,temp of reactant is more. So increasing temperature in such case, reaction goes towards reactants.

forward direction is favoured

........ plz brainliest my answer I definitely write you the complete explanation asap!

Answer:

135 KJ.

Explanation:

The following data were obtained from the question:

Mass of ethanol, C₂H₅OH = 143.45 g

Heat of vaporisation, ∆Hvap = 43.3 kJ/mol

Heat required (Q) =.?

Next, we shall determine the number of mole in 143.45 g of ethanol (C₂H₅OH). This is can be obtained as follow:

Mass of ethanol, C₂H₅OH = 143.45 g

Molar mass of ethanol, C₂H₅OH = (12×2) + (1×5) + 16 + 1

= 24 + 5 + 16 + 1

= 46 g/mol

Mole of ethanol, C₂H₅OH =?

Mole = mass /Molar mass

Mole of ethanol, C₂H₅OH = 143.45/46

Mole of ethanol, C₂H₅OH = 3.118 moles

Finally, we shall determine the heat required to vaporize the ethanol, C₂H₅OH as follow:

Heat of vaporisation, ∆Hvap = 43.3 kJ/mol

Mole of ethanol, C₂H₅OH (n) = 3.118 moles

Heat required (Q) =.?

Q = n•∆Hvap

Q = 3.118 × 43.3

Q = 135 KJ

Therefore, the heat required is 135 KJ

Answer:

Making models

Explanation:

Classifying is the grouping together of items that are alike in some way. Answer: Making models involves creating rep- resentations of complex objects or processes.

Answer:

0.168mL of the 1.0M KI solution must be added

Explanation:

The PbI₂ is in equilibrium with water as follows:

PbI₂ ⇄ Pb²⁺ + 2I⁻

Where Ksp is:

Ksp = 1.4x10⁻⁸ = [Pb²⁺] / [I⁻]²

As molarity of Pb²⁺ is 0.11M:

1.4x10⁻⁸ = [0.11M] / [I⁻]²

1.27x10⁻⁷ = [I⁻]²

3.57x10⁻⁴M = [I⁻]

Thus, to precipitate all Pb²⁺ you need to add 3,57x10⁻⁴M of I⁻. As volume of the solution is 470.0mL = 0.47L, you need to add:

0.47L * (3,57x10⁻⁴moles / L) = 1.68x10⁻⁴ moles of I⁻ = Moles of KI.

That comes from the 1.0M KI. You need to add:

1.68x10⁻⁴ moles of KI * (L / 1.0 mol) = 1.68x10⁻⁴L =

Answer:

AgBr

Explanation:

The salt, AgBr has a very low solubility is pure water. However, it has a high solubility in 1 M NH3. The reason behind this higher solubility of AgBr in 1 M aqueous ammonia solution is the formation of a complex as shown below;

AgBr(s) + 2NH3(aq) ----> [Ag(NH3)2]^+(aq) + Br^-(aq)

The formation of this linear silver diammine complex accounts for the higher solubility of AgBr in 1 M aqueous ammonia solution.

Answer: The possible structure for this compound is 2,4-dimethyl-3-pentanone

Explanation:

It should be noted that, If the 1H NMR spectrum of a compound with formula C7H14O gives a doublet at 9.2 ppm. The possible structure for this compound is 2,4-dimethyl-3-pentanone

Answer:

Source, processing and distribution are the components of water system.

Explanation:

There are three parts of water system i. e. the source, the processing and distribution. Water is extracted from a source such as underground water, lake or river etc. After extraction this water is transported to the processing unit where it can be purified and after purification it is distributed to all places where it is needed. Potential energy is a form of energy that flows through this water system because the water is extracted from a depth and we know that depth and height refers to potential energy.

Answer:

[tex]60 cm^{3}[/tex]

Explanation:

volume=lwh

v=3*5*4

v=[tex]60 cm^{3}[/tex]

Answer:

Option A. 327 °C

Explanation:

The following data were obtained from the question:

Initial pressure (P1) = 12 atm

Initial temperature (T1) = 27 °C

Final pressure (P2) = 24 atm

Final temperature (T2) =?

Next, we shall convert 27 °C to Kelvin temperature. This can be obtained as follow:

Temperature (K) = Temperature (°C) + 273

Initial temperature (T1) = 27 °C

Initial temperature (T1) = 27 °C + 273

Initial temperature (T1) = 300 K

Next, we shall the temperature at which the cylinder will explode as follow:

Initial pressure (P1) = 12 atm

Initial temperature (T1) = 300 K

Final pressure (P2) = 24 atm

Final temperature (T2) =?

P1/T1 = P2/T2

12/300 = 24/T2

Cross multiply

12 × T2 = 300 × 24

Divide both side by 12

T2 = (300 × 24) /12

T2 = 600 K

Finally, we shall convert 600 K to celsius temperature.

This can be obtained as follow:

Temperature (°C) = Temperature (K) – 273

Temperature (K) = 600 K

Temperature (°C) = 600 – 273

Temperature (°C) = 327 °C

Therefore, the minimum temperature at which the cylinder will explode is

327 °C.

Answer: Yes

Explanation:

On the periodic table, you can find the element symbol, name, atomic number, and atomic mass. Just knowing the atomic mass and atomic number can give you the amount of neutrons. The atomic number states the amount of protons. The atomic mass is proton+neutron. Knowing this, you can subtract the atomic mass by the atomic number to get neutron.

Example: Carbon

Atomic number: 6

Atomic mass: 12.011 or 12

12-6=6                                                   [Atomic mass - Atomic number]

There are 6 neutrons in Carbon.

Answer:

b. 0.407

Explanation:

Acetic acid / Acetate ion is a buffer (Mixture of a weak acid, acetic acid, with its conjugate base, acetate ion) with pKa = -log Ka = 4.74.

The simplest way to determine the pH of a buffer is using Henderson-Hasselbalch formula:

pH = pKa + log [Conjugate base] / [Weak acid]

For acetic buffer with pH = 4.35:

4.35 = 4.74 + log [A⁻] / [HA]

-0.39 = log [A⁻] / [HA]

0.407 = [A⁻] / [HA]

Thus, right option is:

The question is incomplete, the complete question is;

With all of this data in hand, we can now set up our reaction. To begin we are going to use 0.7 g of (35)-2.2-dibromo-3,4-dimethylpentane. Question #7: Using the molecular weight (258 g/mol) determine the amount of mmol of (3S)-2,2,- dibromo-3,4-dimethylpentane required. Round to the tenths place

Answer:

2.70 mmols

Explanation:

Given that;

Mass of (3S)-2,2,- dibromo-3,4-dimethylpentane = 0.7 g

Molar mass of (3S)-2,2,- dibromo-3,4-dimethylpentane = 258 g/mol

From,

Number of moles = mass/molar mass

Number of moles of (3S)-2,2,- dibromo-3,4-dimethylpentane = 0.7g/258 g/mol = 2.7 ×10^-3 moles

Therefore;

Number of moles of (3S)-2,2,- dibromo-3,4-dimethylpentane = 2.70 mmols

Answer:

How can you determine which bond in a structure is more polar without using an electronegativity table?

Explanation:

When we say something is polar, it has a very specific meaning. It means that there is a spatial separation of charges, or a dipole moment. In the simplest case, this is given by:

μ=Qr

Where μ is the dipole moment, Q is the charge on each pole (equal and opposite) and r is the distance between the charges.

Anything with charges can have a dipole moment, and therefore be polar. In chemistry, we typically worry about whether or not two things are polar:

Bonds

Molecules

Bond Polarity

Chemists are concerned with the polarity of bonds because polarity affects the character of the bond - the more polar the bond is, the more it behaves like an ionic bond. The less polar, the more it behaves like a covalent bond. This has implications for everything from naming rules to reactivity, but all you need to know for this problem is:

All bonds between two atoms are polar, unless the atoms are identical.

(This is including whatever else the atoms may be bonded to). The only question after that is "how polar is the bond," and that is where tables of electronegativity come in. Using an arbitrarily defined scale, we can measure the relative polarity of bonds by comparing the difference in electronegativity between the two elements.

Molecule Polarity

For molecules, polarity isn't quite so simple. We know that all bonds between dissimilar atoms are polar, but in a molecule, sometimes the dipole moments add up to form a net dipole moment of zero. This is a little bit difficult to explain if you don't have a mathematics and physics background that includes vectors and summations of forces/moments.

If you do, then when I say something like:

The net dipole moment for a molecule is equal to the sum of dipole moments over each bond.

It will make sense to you. If you don't, then you have to get a little more creative. I tell my students to imagine that there are ropes connecting each outer molecule to the central molecule, along each bond. Then imagine pulling each rope towards the side that is more electronegative (has a higher electron density). The more polar the bond, the harder you pull on the rope. Then imagine whether the molecule moves. If the forces balance, it stays put, so the net dipole moment is zero and it is not polar. If it does move, there was a net dipole moment, so it is polar.

This works pretty well - as long as you can visualize the molecular geometry. That's the hard part. To know how the bonds are oriented in space, you have to have a strong grasp of Lewis structures and VSEPR theory. Assuming you do, you can look at the structure of each one and decide if it is polar or not - whether or not you know the individual atom electronegativity. This is because you know that all bonds between dissimilar elements are polar, and in these particular examples, it doesn't matter which direction the dipole moment vectors are pointing (out or in).

Let's look at each one, using wikipedia's geometric pictures.

BrF5

BrF5

As you can see, there is a lone pair at the bottom (this is a square pyramidal geometry). The net dipole moment will be pointing "up", which makes this a polar molecule.

PBr5

PBr5

This one has a trigonal bipyramidal geometry, with each bond symmetrically opposed to each of the others. If you add up the vectors, they result in a net dipole moment of zero. Therefore, it is non-polar.

EDIT: As ron points out in the comments below, this is not really a binary molecular compound, and in reality forms an ionic crystal structure with PBr4+ and Br−. I don't think the author of the question intended you to worry about that, but if they did, the answer is still "non polar," although we wouldn't really call it a "molecule" any more.

CCl4

CCl4

Carbon tetrachloride has a tetrahedral geometry, and all the dipole moment vectors cancel. Therefore, it is non-polar.

XeF2

XeF2

This one is linear - no net dipole moment, so it is non-polar.

XeF4

enter image description here

I could only find the ball-and-stick model for this one. It is square planar - there is a lone pair of electrons (not shown) on each "face" of the square on Xe. There is no net dipole moment, so it is also non-polar.

Out of all of these, the only polar molecule is BrF5 (the first one).

If the net dipole moment is zero, it is non-polar. Otherwise, it is polar.

Answer:

-15.5 kJ/mol

Explanation:

2A ⇄ 2B + C

[tex]$ K = \frac{[C][B]^2}{[A]^2} $[/tex]

   = [tex]$ \frac{(0.69)(0.49)^2}{0.88^2} $[/tex]

  = 0.21

T = [tex]$ 43.9^{\circ} $[/tex]C

   = (273 + 43.9) K  =  316.9 K

[tex]$ \Delta G^{\circ} = -19.4 $[/tex] kJ/mol

R = 8.314 J/k-mol  =  0.008314 kJ/k-mol

[tex]$ \Delta G = \Delta G^{\circ} - RT \ln K $[/tex]

     [tex]$ =-19.4 - 0.008314 \times 316.9 \ln (0.21) $[/tex]

     = -15.5 kJ/ mol

Answer:

A. Protium

B. Deutrium

C. Tritium

Explanation:

A hydrogen isotope with one proton:

Protium

A hydrogen isotope with two protons:

Deutrium

A hydrogen isotope with protons:

Tritium

Hope this helped ;) ❤❤❤

Answer:

0 °C

Explanation:

Answer:

0 C

Explanation:

Answer:

Oceans

Explanation:

The majority of water is found in the ocean where it contains 96.5% of earths water. :)

The correct answer is D. Grocery stores that sell legumes

Explanation:

One of the main points this claim proposes is that metabolism can be improved by consuming legumes, this is expressed in "incorporating legumes such as lentils and chickpeas... boosts metabolism." In this context, if this is proven as true through an argumentative text or speech, it is likely many people want to increase their intake of legumes because a better metabolism has multiple benefits for health. Moreover, increased intake of legumes means an increase in the sale of legumes and higher profits for stores selling legumes. This means the claim might benefit grocery stores that sell legumens (option D.)

Answer:

They will repel each other.

Explanation:

According to Coulomb's law, the force between two chargee is directly proportional to the product of the magnitude of the both charges and inversely proportional to their distance apart.

The force of attraction between electric charges may be attractive or repulsive in nature. When two negative charges are placed in close proximity to each other, they repel each other because like charges repel each other.

Answer:

1.5 moles of CO₂ are produced

Explanation:

Based on the chemical equation:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O -The reaction of the question is wrong-

5 moles of oxygen reacts per mole of propane, C₃H₈, to produce 3 moles of CO₂ and 4 moles of water.

If 2.5 moles of oxygen react and, 5 moles of oxygen produce 3 moles of CO₂, moles of CO₂ produced are:

2.5 moles O₂ * (3 moles CO₂ / 5 moles O₂) =