Describe how the calcium atom and the oxygen atom forms calcium oxide
You should give the charge on each ion formed

Answer:

C: checking your email

Explanation:

I believe that C would be impossible, as you cannot use wireless networks without radio waves

Answer:

the answer is 4=Be 9 =F 16=S 17 = CL

Explanation:

atomic no 4 = beryllium (Be)

" " 9 = fluorine (F)

16 = sulfur (S)

17 = chlorine (CL)

The atomic number of Beryllium is 4, the atomic number of fluorine is 9,  atomic number of sulfur is 16 and the atomic number of chlorine is 17.

The atomic number is defined as the number of protons in the nucleus of an atom or the number of electrons revolving around the nucleus in orbits or shell.

So we can conclude that he atomic number of Beryllium is 4, the atomic number of fluorine is 9,  atomic number of sulfur is 16 and the atomic number of chlorine is 17.

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Answer:

pH = 5.37

Explanation:

We'll begin by obtaining the concentration of the hydrogen ion in the solution. This can be obtained as follow:

HNO₃ (aq) —> H⁺ (aq) + NO₃¯ (aq)

From the balanced equation above,

1 mole of HNO₃ produced 1 mole of H⁺.

Therefore, 4.3×10¯⁶ M HNO₃ will also produce 4.3×10¯⁶ M H⁺.

Finally, we shall determine the pH of the solution. This can be obtained as follow:

Concentration of Hydrogen ion [H⁺] = 4.3×10¯⁶ M

pH =?

pH = –Log [H⁺]

pH = –Log 4.3×10¯⁶

pH = 5.37

Therefore, the pH of the solution is 5.37

V2 = 21.4 ml

Explanation:

Note: When dealing with gases, make sure that you change the units from °C to K.

T1 = 15°C + 273 = 288K

T2 = 35°C + 273 = 308K

V1 = 20 ml

V2 = ?

We use Charles's law to solve V2:

V1/T1 = V2/T2

or

V2 = (T2/T1)V1

= (308K/288K)(20 ml)

= 21.4 ml

Coal is extracted by mining.

Once coal has been extracted, it can be used directly  for heating and industrial processes or to fuel power plants for electricity.

Benefits are:

Coal energy is an affordable energy source because of the coal's stable price compared to other fuel sources.

Coal is easy to burn.

Coal produces high energy upon combustion.

Coal energy is inexpensive.

The breakdown or dissolution of rocks and minerals of the planet's surface is called weathering it can be chemical, biological or physical.

Chemical weathering occurs in regions with high rainfall and high temperature.

Therefore, Albany will have mechanical while Washington will suffer from chemical weathering.

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Mass of the liquid water in the container is 35 grams-

The mass of the liquid water in the container should be 35 grams.

Mass would not change during a change of state because the number of particles does not change during a state change. It does not matter if a substances freezes, boils, melts, sublimates.

So, the mass of liquid water in the container is the same as ice. Hence, the correct option is (A).

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Answer:

HI

H₂O

H₃O⁺

I⁻

Explanation:

Bronsted-Lowry acids are chemicals that can donate protons, and Bronsted-Lowry bases are chemicals that can accept them. Conjugate bases and acids are the resulting effect of losing or gaining a proton in the form of H⁺.

Answer:

b

Explanation:

Hydrocarbons provide 84% of the world's energy, but they are non-renewable. Hydrocarbons are the most economic form of energy.

Answer:

Option 1

Explanation:

p can hold upto 6 e-.

It would be easy if it gains 2e-, instead of losing 4e-, to be stable.

It gains 2e, and gets a charge of - 2e.

It forms O (2-)

Answer:

Explanation:

Because the gravitational pull of the moon is weaker on the far side of the Earth, inertia wins, the ocean bulges out and high tide occurs.

hope it helps:)

Answer:

1.61

Explanation:

I got this answer from a calculator and it's correct.

The mass of a substance is the product of its density and volume. Thus, the   mass of the dissolved solids with a density of 125 mg/dm³ with a volume of 250 cm³ is 31.25 mg.

Density of a substance is the measure of its mass per unit volume. Thus it describes how much denser the substance is in a given volume. Mathematically it is the ratio of mass to the volume.

Density of a substance depends on the mass, volume, bond type, temperature and pressure. The ratio of density of a substance with the density of water is called its specific gravity.

It is given that the density of the dissolved solids is 125 mg/dm³ and the volume is 250 cm³ or 0.25  dm³. Thus the mass can be calculated as follows:

density = mass/volume

 mass   = density × volume

             = 0.25  dm³  ×  125 mg/dm³

             = 31.25 mg

Hence, the mass of the dissolved solids in the river wayer is 31.25 M=mg.

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Answer:

It is formed between two atoms of the same elements having same electronegativity in which the bonding electrons are equally shared between them. In this case, the centre of the positive charge coincides with the centre of the negative charge in theecular molecule. H, N: 0. etc. are the molecules in which non polar covalent bonds invalved. These substances are called non polar substances.

Answer:

A nonpolar covalent bond is a covalent bond in which the bonding electrons are shared equally between the two atoms. In a nonpolar covalent bond, the distribution of electrical charge is balanced between the two atoms.

Explanation:

Answer:

A solution with a pOH of 4.3 has a [H+] of 2*10⁻¹⁰ M.

Explanation:

The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution.

pOH indicates the concentration of hydroxyl ions [OH-] present in a solution. It is defined as the negative logarithm of the activity of hydroxide ions. That is, the concentration of OH- ions:

pOH= -log [OH-]

On the other hand, pH is also a measure of the basicity or alkalinity of a solution. POH is an indicator that is related to pH by:

pOH + pH= 14

So, if the solution has a pOH equal to 4.3, the pH is calculated by:

4.3 + pH= 14

pH= 14 - 4.3

pH= 9.7

The pH is defined as the logarithm of the concentration of H+ ions, with the sign changed:

pH= -log [H+]

So, in this case:

9.7= - log[H+]

Solving

[H+]= 2*10⁻¹⁰ M

A solution with a pOH of 4.3 has a [H+] of 2*10⁻¹⁰ M.

Answer:

The rate would be higher, and the concentration of products would be lower.

Explanation:

The correct answer is The rate would be lower, and the concentration of products would be higher.

The rate of reaction refers to the speed with which reactants are converted into products.

The rate of reaction decreases as the reaction progresses because more reactants are being converted into products.

As such, the reactant concentration decreases and the concentration of products increases.

Hence, after three seconds, the rate would be lower, and the concentration of products would be higher.

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Answer:

A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection.



The typical design of a Thermos brand vacuum flask, used for maintaining the temperature of fluids such as coffee.



Laboratory Dewar flask, Deutsches Museum, Munich



Diagram of a vacuum flask



A cryogenic storage dewar of liquid nitrogen, used to supply a cryogenic freezer

Vacuum flasks are used domestically, to keep beverages hot or cold for extended periods of time, and for many purposes in industry.

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Answer:

Exothermic reaction

Explanation:

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise

The potential energy diagram for a reaction starts at 180 kJ and ends at 300 kJ. the type of reaction does the diagram best represent exothermic reaction.

An exothermic reaction would be one in which heat energy is emitted. Exo stands for "evolve out." The term "thermos" refers to a container that holds heat. The term "exothermic" refers to a process in which heat is produced. In general, an exothermic reaction is one in which heat is released as a byproduct.

Therefore, the reaction diagram will represent exothermic reaction.

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Answer:

Sun and the stars, nothing humans don't use fusion at all

Explanation:

Nuclear fusion reactions  power the  sun  in space. Humans currently use fusion in nuclear weapons by means of nuclear reactions, but researchers are seeking more applications.

There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.

In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.

In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.

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Answer:

[tex]at \: stp : \\ 22400 \: ml \: are \: occupied \: by \: 71 \: g \: of \: chlorine \\ 563 \: ml \: will \: be \: occupied \: by \: ( \frac{563}{22400} \times 71) \:g \\ = 1.78 \: g[/tex]

Answer:

See Explanation

Explanation:

In discussing the reason why Et₃SiCl is more easily hydrolysed than Et₃CCl, we must remember that the electronegativity difference between silicon and chlorine is much higher than the electronegativity difference between carbon and chlorine.

As a result of this, the Si-Cl bond in Et₃SiCl is more polar and hence susceptible to attack by water than the C-Cl bond in Et₃CCl.

Also, it is postulated that the presence of vacant d orbitals on silicon assists hydrolysis in Et₃SiCl. Such vacant orbitals are absent in carbon hence Et₃CCl does not undergo hydrolysis.

The reaction scheme is shown in the image attached to this answer.

Answer:

Aluminum oxide (Al₂O₃)

Explanation:

The standard heat (or enthalpy) of formation of a compound, is the amount of change in the enthalpy that takes place when 1 mole of the compound is produced from the elements it contains whereby the compounds and elements in the reaction are in their standard states

The standard state of an element, is the state in which the element is in the most stable form at a pressure of 1 bar

Therefore, the heat of formation of hydrogen, H₂, oxygen, O₂, and potassium, (K), will have a heat of formation of zero, while Al₂O₃ which is made of aluminum and oxygen in combining to form a compound in proportions which are different from their initial standard states will have a heat of formation not equal to zero

Answer:

The correct answer is - DNA (check image).

Explanation:

In this diagram, The W mark is the nucleus of the cell X is the chromosome Y represents the DNA and Z is the gene. Gene is the segment of the DNA and DNA is the pat of the chromosome with histone. Chromosomes are present in the nucleus of the cell. These all are the structures of the genetic structures.

Thus, the correct answer is - DNA.

Answer:

dna

Explanation:

edge

Answer:

equal to [OH-]

Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter. Thus, in a neutral solution the hydrogen ion (H+) and the hydroxyl ion (OH−)

Answer:

will this work or help?

Explanation:

Calculate the mass of NaOH required to prepare a 0.343 M solution dissolved in 2500 mL of water. 0.343 M = x mol / 2.5 L = 0.86 mol 0.86.

Answer:

~2.054M

Explanation:

In this question ,I am going to assume that the acid is monoprotic acid(contains only one hydrogen) which I'll represent by HA.

Chemical equation:

NaOH(aq) + HA(aq)----->NaA(aq) + H2O(l)

The mole ratio of NaOH:HA is 1:1

1.25M NaOH=1.25 Moles/L or 1.25 moles /1000ml of NaOH

(1.25 moles /1000ml) x (24.65ml)=0.0308125 moles NaOH

Mole ratio is 1:1

So, moles of HA are also 0.0308125 moles

volume of HA  =15ml

To find molarity of HA:

=(0.0308125 moles x 1000ml)/(15ml)

~2.054M of HA

~Hope it helps:)

Answer:

d

Explanation: