What is the CATHODE half-reaction for the cell
Cu(s)—> Cu2+ (aq)||Ag+ (aq)|Ag(s)?

Answer:

What is surface tension?

Explanation:

Surface tension and droplets: Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer.

Surface tension forces between mucosal surfaces play an important role in the pathogenesis of the disease. The obstruction of upper airway elicit the activation of autonomic nervous system, hypoxemia, and arousal from sleep.

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Answer:

Calcium is then pumped back into the sarcoplasmic reticulum breaking the link between actin and myosin.

Explanation:

Actin and myosin return to their unbound state causing the muscle to relax. Alternatively relaxation (failure) will also occur when ATP is no longer available.

Answer:

Butanoic acid and 2-propanol reacts to form isopropyl butyrate.

Explanation:

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Answer:

I don't know sorry am read in 5 class

Answer:

More Reactive:

iron

hydrogen

zinc

magnesium

zinc

iron

Explanation:

The reactivity of metals can be determined based on their ability to displace other metals from their compounds or to displace hydrogen from acids. Generally, metals that are higher in the reactivity series can displace metals lower in the series.

1. **Iron & Copper:** Iron is more reactive than copper. If iron is present in its pure form, it would displace copper from its compound.

2. **Copper & Hydrogen:** Hydrogen is less reactive than copper. No reaction will occur if hydrogen is the element in pure form.

3. **Zinc & Iron:** Zinc is more reactive than iron. If zinc is present in its pure form, it would displace iron from its compound.

4. **Iron & Magnesium:** Magnesium is more reactive than iron. If magnesium is present in its pure form, it would displace iron from its compound.

5. **Zinc & Hydrogen:** Hydrogen is less reactive than zinc. No reaction will occur if hydrogen is the element in pure form.

6. **Iron & Hydrogen:** Hydrogen is less reactive than iron. No reaction will occur if hydrogen is the element in pure form.

Remember, the reactivity series is a ranking of metals based on their tendency to lose electrons and form positive ions. Elements higher in the series can displace elements lower in the series from their compounds in certain reactions.

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Answer:

A. All isotopes have no charge

Answer:

Oxygen has 6 valence electrons and follows the octet rule.

If you were drawing a lewis structure for O2, there would be a total of 12 valence electrons (6 x 2 = 12).

The completed structure would have a double bond between the two oxygen atoms with 2 lone pairs per oxygen, giving you a total of 8 electrons that are lone pairs (or dots).

Answer:

A

Explanation:

Answer:

I'm not quite sure what the question is. What is the third step? I think I can help, would you mind commenting what the third step is? :)

Explanation:

Answer:

[tex]\huge\boxed{\sf 2.27\ atm = 1,725\ mm\ of\ Hg}[/tex]

Explanation:

We know that:

1 atm = 760 mm of Hg (Standardly)

Multiply both sides by 2.27

2.27 atm = 760 * 2.27 mm of Hg

2.27 atm = 1,725 mm of Hg

[tex]\rule[225]{225}{2}[/tex]

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Answer:

if the red allele is dominant 3 out of 4 offspring will have the red characteristic and 1 out of 4 will have white characteristic

The mass of water produced by the reaction of the 23 g of [tex]SiO_2[/tex]  is 13.8 g.

The given chemical reaction;

[tex]4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)[/tex]

In the given compound above, we can deduce the following;

60 g of [tex]SiO_2[/tex]  --------- 36 g of water

23 g of [tex]SiO_2[/tex]  ------------- ? of water

[tex]mass \ of \ water = \frac{23 \times 36}{60} = 13.8 \ g \ of \ water[/tex]

Thus, the mass of water produced by the reaction of the 23 g of [tex]SiO_2[/tex]  is 13.8 g.

In the reaction of the given compound, [tex]4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)[/tex], what mass of water (in grams) is produced by the reaction of 23.0 g of SiO2?

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Answer:

2Cu + S ~~~> Cu2S Copper (C) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction.

Explanation:

Answer:

[Ar] 4s²

Explanation:

The full electron configuration for the Ca+ ion is:

1s² 2s² 2p⁶ 3s² 3p⁶.

To determine the full electron configuration for a Ca+ ion, we need to remove one electron from the neutral calcium atom (Ca). The neutral calcium atom has the electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².

When Ca loses one electron to form the Ca+ ion, the electron removed comes from the highest energy level, which is the 4s orbital.

Therefore, the full electron configuration for the Ca+ ion is:

1s² 2s² 2p⁶ 3s² 3p⁶.

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Answer:

Characteristics such as melting point, boiling point, density, solubility, color, odor, etc. are physical properties. Properties that describe how a substance changes identity to produce a new substance are chemical properties. ... Physical and chemical properties can be used to classify a substance as ionic or molecular.

If an anhydrous Cupric Perchlorate weighs 262.447g/mol initially and weighs 370.540 g/mol after sitting on the bench to absorb water from the air, the number of water molecules absorbed would be 6 moles.

First, let us calculate the amount of water gained during the course of staying on the bench:

Water gained = weight after gaining water - initial weight

                       =  370.540 - 262.447

                        = 108.093g/mole

The total amount of water gained per mol is 108.093. Each water molecule weighs 18.015 g/mole. Thus, the total number of water molecules that will sum up to 108.093 would be:

                         108.093/18.015 = 6 moles

In other words, the number of water molecules absorbed by the Cupric Perchlorate is 6 moles.

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Answer:

number of moles = 0.1001 mol

Explanation:

number of moles = mass/molar mass

number of moles = 3.65g / 36.459 g/mol

n = 0.1001 mol

Answer: Metallic bonding.

Explanation: Aluminum forms metallic bonds with itself. This results in a metallic lattice structure.

Aluminum is found in the 13 group of periodic table and it mostly forms ionic bonds with metal. The structure of Aluminum is Orthorhombic mainly.

What is element?

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

The structure of Aluminum is Orthorhombic and it contains high neutron capture cross section. It is very stable in dry air but oxidizes in moist air. It reacts with oxygen to form Al₂O₃.Valence of Aluminum is III. Its electronic configuration is  [Ar]3d¹⁰ 4s² 4p¹

Thus  structure of Aluminum is Orthorhombic and metallic bond is formed by Aluminum

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Answer: Is B: the supply will eventually be exhausted.

Explanation:

there is only so much coal in the world as in many other elements. That is why we are looking for more appropriate and resourceful way of supplying energy and it is a lot safer for the workers involved

As coal is a nonrenewable source of energy so its supply will eventually be exhausted. Therefore, option (B) is correct.

Non-renewable energy can be described as energy that comes from fossil fuels such as coal, natural gas, crude oil, and uranium. Non-renewable energy requires human intervention to create it suitable for consumption. Fossil fuels are generally made up of Carbon. Fossil fuels were produced over 300 million years ago.

Non-renewable energy is generally fossil fuels such as coal, oil, natural gas, etc. Fossil Fuels are produced from the remains of animals and plants and can be is divided into three categories.

To produce natural gas from fossil fuels, the decomposition process is longer and conducted with high amounts of pressure and heat. Coal takes millions of years under the crust of the earth to produce through the decomposition of trees, plants, and ferns.

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The answer should be A

VisibleVisible wave length visible wavelength of light that are emitted by Adams can be used to get Nate explosive devices remotely

I'm not able to understand that what is written in the pic.. As I can't understand this language..

Treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Chemotherapy may be given by mouth, injection, or infusion, or on the skin, depending on the type and stage of the cancer being treated.

The concentrations of all species in a 0.100 M Na₂CO₃ are:  

1. The concentration of Na⁺ in the solution is 0.2 M.

2. The concentration of CO₃²¯ in the solution is 0.1 M

We'll begin by writing the dissociation equation for Na₂CO₃. This is illustrated below:

Na₂CO₃(aq) —> 2Na⁺(aq) + CO₃²¯(aq)

Thus, the species in Na₂CO₃ are Na⁺ and CO₃²¯

From the balanced equation above,

1 mole of Na₂CO₃ contains 2 moles Na⁺ and 1 mole of CO₃²¯

1. Determination of the concentration of Na⁺.

From the balanced equation above,

1 mole of Na₂CO₃ contains 2 moles Na⁺

Therefore,

0.100 M Na₂CO₃ will contains = 2 × 0.1 = 0.2 M Na⁺

Thus, the concentration of Na⁺ in the solution is 0.2 M.

2. Determination of the concentration of CO₃²¯

1 mole of Na₂CO₃ contains 1 mole of CO₃²¯

Therefore,

0.100 M Na₂CO₃ will also contains 0.100 M CO₃²¯

Thus, the concentration of CO₃²¯ in the solution is 0.1 M

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so 2.46 X 10^28 contains (2.46 X 10^28)/(6.02 X 10^23) =

(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=

4.09 X 10^4 = 40,900

Answer:

4.09 X 10^4 = 40,900 moles

Explanation:

How many moles of Magnesium(Mg) are

in 2.46 x 10^28 atoms of Magnesium?

PLEASE LEARN THIS FUNDAMENTAL RULE OF CHEMISTRY...1 MOLE OF ANYTHING CONTAINS AVOGADROS NUMBER OF PARTICLES}

6.02 X 10^23.09

so 2.46 X 10^28 contains in moles(2.46 X 10^28)/(6.02 X 10^23) =

(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=

4.09 X 10^4 = 40,900 moles

Ferrus is a transition metal.

FeCl_2

Electronic configuration is given by

[tex]\\ \sf\longmapsto [Fe]^{2+}=1s^22s^22p^63s^23p^64s^23d^4[/tex]

FeCl_3

Electronic configuration is given by

[tex]\\ \sf\longmapsto [Fe]^{3+}=1s^22s^22p^63s^23p^64s^23d^3[/tex]

In the pond, the percentage of fish left after ten days is 4%.

Given that;

N(t) = Noe^-kt

Where;

N(t) = percentage of fish at time t

No = Initial percentage of fish

k = rate constant

t = time taken

Given that we had 100% fish population at the beginning, we can see that this reaction is first order.

The rate constant is obtained from;

When t = 5

19 = 100e^-5k

19/100 =e^-5k

0.19 = e^-5k

ln 0.19 = -5k

k = ln (0.19)/-5

k = 0.33

In ten days;

N(10) = 100e^-0.33(10)

N(10) = 4%

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