Which is the atomic number of an atom with six valence electrons?
A)8
B)10
C)12​

Answer:

the first one

Explanation:

Answer:

It forms from two hydrogen atoms, each with one electron in a 1s orbital. Both hydrogen atoms share the two electrons in the covalent bond, and each acquires a helium-like electron configuration.

Answer:

Find alternatives to fossil fuels

Explanation:

The most effective long - term solution to reduce the amount of carbon dioxide emission is to find alternatives to fossil fuels.

Fossil fuels consumption and use in most industrial processes are some of the leading causes of huge carbon signatures in the atmosphere.

Answer:

 .24 mg

Explanation:

The mineral contains .016 % silicon

mass of the mineral = 1.5 kg

mass of silicon = 1.5 x .016 %

= 1.5 x .016 / 100

= 24 x 10⁻⁵ kg

= 24 x 10⁻² mg

= .24 mg .

Explanation:

In a covalent bond the electrons are simultaneously attracted by the two atomic nuclei.

In a covalent bond the electrons are; simultaneously attracted by the two atomic nuclei.

Covalent bonding can be defined as the sharing of electrons between two atoms.

The Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.

We know that

Polar covalent bond is defined as a chemical bond in which electrons are shared unequally or unevenly between two atoms.

Non-polar covalent bond is defined as a chemical bond in which electrons are shared evenly or equally between two atoms.

Therefore, In a covalent bond the electrons are; simultaneously attracted by the two atomic nuclei.

To learn more about the bonding, please visit here;

https://brainly.com/question/25150590

#SPJ2

Answer:

The new class of compound formed is an alcohol.

Explanation:

The treatment of an alkene with Hg(OAc)₂ in alcohol followed by reaction with NaBH₄ gives an alcohol. This reaction is known as oxymercuration-demercuration reaction. It is a two-step pathway which proceeds in the Markovnikov manner. In this reaction, the alkene react with the Mercury salt (Hg(OAc)₂) and a nucleophile (alcohol) to form an organomercury intermediate. The intermediate's carbon-mercury bond is then converted to carbon-hydrogen bond by the reaction with NaBH₄. An alcohol is then produced.

Answer:

Na (sodium)

Explanation:

An atom, which is the smallest indivisible particle of an element, contains three sub-atomic particles namely: proton, electron, and neutron. An atom is said to be neutrally charged if it contains a charge 0.

In a neutral atom, the number of electrons and the number of protons in an element are equal. These numbers are called the ATOMIC NUMBER. That is, in a neutral atom;

proton no. = electron no. = Atomic no.

Hence, in this case where Silicon atom has an electron number of 14. If three of this electrons are removed, there will be 11 electrons left, hence, this atom becomes SODIUM element, which has 11 electrons in its atom, with chemical symbol Na.

Answer: the destruction of the butterflies’ environment

Explanation:

A mutation that would result in darker wings will mean that the birds that prey on them will stop eating a lot of them so this won't lead to extinction.

A decrease in the birds that eat the butterflies will also mean that the butterflies will survive more because they will have less predators.

Overproduction of butterfly offspring means more butterflies so they will not go extinct.

If their habitat was destroyed however, the butterflies might find it hard to survive as any new environment they go to might not be suitable leading to their extinction.

Answer:

I believe it is c

Explanation:

Answer: 3 molecules of carbon dioxide and 4 molecules of water are produced during the combustion of propane.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reaction for combustion of propane is:

[tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]

3 molecules of carbon dioxide and 4 molecules of water are produced during the combustion of propane.

Answer:

d. The sisters played against each other in tennis, but they did it without spite.

Explanation:

Answer:

The sisters played against each other in tennis, but they did it without spite

Explanation:

Answer: ADF

Explanation: On my moms it’s right

The statements describe how heat flows in foil are heat flows in all directions, Heat flows from the cooler atoms to the warmer atoms, Heat flows from the warmer atoms to the cooler atoms. Therefore, option A, D and E are correct.

Heat is the result of the movement of kinetic energy within a material or an item, or from an energy source to a material or an object. Radiation, conduction, and convection are the three mechanisms through which such energy can be transferred.

Due to its extraordinary thinness and shine, aluminum foil has special characteristics. It bounces heat waves back outward rather than effectively absorbing or conducting heat. This explains why aluminum foil cools almost instantly after being removed from the oven, even after it has been there for some time.

The majority of the radiation released by a heated object is reflected onto the object when it is wrapped in reflective aluminum foil.

Thus, option A, D and E are correct.

To learn more about the heat, follow the link

https://brainly.com/question/1429452

#SPJ2

Answer:

Around.

Explanation:

A chemical formula helps scientists to show or illustrate the type and number of atoms present in a particular molecule or compound by using numerical subscript, ions and atomic symbol of a chemical element.

This ultimately implies that, a chemical formula is used to describe or denote the exact amount of atoms that make up a molecule or compound.

The type of bond which is formed when the atoms of a chemical element are sharing electrons is known as covalent bond. Thus, when two (2) atoms of a chemical element comes close together, the nucleus of one of the atom attracts the other atom's electrons.

However, before bonding takes place, the atom's electrons spend most of their time around the nuclei of each atom.

Answer: lighter atoms

energy

neutrons

Explanation:

A nuclear fission is simply defined as a nuclear reaction whereby the nucleus of an atom is being divided into smaller nuclei which are also lighter. An energy is also released when this occurs.

Therefore, the products of a fission include lighter atoms, energy and neutrons.

Answer:

lighter atoms

energy

neutrons

Explanation: took test

Answer:

17 kJ

Explanation:

Calculation for the Calculate the energy required to heat 0.60kg of ethanol from 2.2°C to 13.7°C.

Using this formula

q = mC∆T

Where,

q represent Energy

m represent Mass of substance=0.60kg=600g

C represent Specific heat capacity=2.44J·g−1K−1.

∆T represent change in Temperature=2.2°C to 13.7°C.

Let plug in the formula

q=(0.60 kg x 1000 g/kg)(2.44 J/gº)(13.7°C-2.2°C)

q = (600g)(2.44 J/gº)(11.5º)

q=16.836 kJ

q= 17 kJ (Approximately)

Therefore the energy required to heat 0.60kg of ethanol from 2.2°C to 13.7°C will be 17 kJ

Answer: With the cold front, warm air is rapidly forced upward (like the shavings) in advance of the actual front (the “cutter”), creating towering cumulus clouds, some hard showers and quite possibly a few gusty thunderstorms followed by a push of cooler and drier air in its wake.

Explanation:

Answer: The answer is TiCl4 + 2H2O --> TiO2 + 4HCl

Explanation: Every element is equal on both sides.

Ti- 1   Ti-1

Cl- 4   Cl-4

H- 4   H-4

O- 2   O-2

Answer:

pH = 12.22

Explanation:

... To make up 170mL of solution... The temperature is 25°C...

The dissolution of Barium Hydroxide, Ba(OH)₂ occurs as follows:

Ba(OH)₂ ⇄ Ba²⁺(aq) + 2OH⁻(aq)

Where 1 mole of barium hydroxide produce 2 moles of hydroxide ion.

To solve this question we need to convert mass of the hydroxide to moles with its molar mass. Twice these moles are moles of hydroxide ion (Based on the chemical equation). With moles of OH⁻ and the volume we can find [OH⁻] and [H⁺] using Kw. As pH = -log[H⁺], we can solve this problem:

Moles Ba(OH)₂ molar mass: 171.34g/mol

0.240g * (1mol / 171.34g) = 1.4x10⁻³ moles * 2 =

2.80x10⁻³ moles of OH⁻

Molarity [OH⁻] and [H⁺]

2.80x10⁻³ moles of OH⁻ / 0.170L = 0.01648M

As Kw at 25°C is 1x10⁻¹⁴:

Kw = 1x10⁻¹⁴ = [OH⁻] [H⁺]

[H⁺] = Kw / [OH⁻] = 1x10⁻¹⁴/0.01648M = 6.068x10⁻¹³M

pH:

pH = -log [H⁺]

pH = -log [6.068x10⁻¹³M]

Answer:

a penny that has turned green

Explanation:

a chemical change is when a substance combines with another to form a new substance. the other answer choices doesn't form a new substance.

Answer:

The volume that the same gas will occupy at 101.3 kPa if the temperature is kept constant is 5.27 L.

Explanation:

As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law that says:

"The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

P * V = k

Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1 * V1 = P2 * V2

In this case, you have:

Replacing:

92 kPa* 5.80 L= 101.3 kPa* V2

and solving, you get:

[tex]V2=\frac{92 kPa* 5.80 L}{101.3 kPa}[/tex]

V2= 5.27 L

The volume that the same gas will occupy at 101.3 kPa if the temperature is kept constant is 5.27 L.

Answer:

Love is not only the thing in this world!

Study hard, you can choose a better way of life.

Answer: Gravity will pull two objects toward each other

Explanation:

Answer:C

Explanation:Gravity

Answer: The empirical formula is [tex]C_3H_6O[/tex]

Explanation:

If percentage are given then we are taking total mass is 100 grams. So, the mass of each element is equal to the percentage given.

Mass of C = 62.04 g

Mass of H = 10.43

Mass of O = (100-(62.04+10.43)) g  = 27.53 g

Step 1 : convert given masses into moles.

Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{62.04g}{12g/mole}=5.17[/tex]moles

Moles of H =[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{10.43g}{1g/mole}=10.43moles[/tex]

Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{27.53g}{16g/mole}=1.72moles[/tex]

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = [tex]\frac{5.17}{1.72}=3[/tex]

For H =  [tex]\frac{10.43}{1.72}=6[/tex]

For O =[tex]\frac{1.72}{1.72}=1[/tex]

The ratio of C :H :  O= 3: 6 : 1

Hence the empirical formula is [tex]C_3H_6O[/tex]

Answer:

It takes millions of years to form,

Compressing on the ocean floor.

Then one day they come to shore

and sediments they are no more.

They can sometimes tell of life before

with layers, fossils and much more! this is the rock formation

it's not a decoration .

Explanation:

Answer:

MgBr2 > KBr > C3H7COOH > C6H12O6

Explanation:

A strong electrolyte is a solution that dissociate completely in solution. A weak electrolyte does not dissociate completely in solution. The more the number of particles in solution, the more the conductivity of the solution.

For the substances Lister in the question;

MgBr2(aq) ------> Mg^2+(aq) + 2Br^-(aq)

KBr(aq) -----> K^+(aq) + Cl^-(aq)

C3H7COOH(aq) ------->C3H7COO^-(aq) + H^+(aq) (poorly dissociates)

C6H12O6 does not dissociate because it is molecular

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

volume = final volume of water - initial volume of water

volume = 260.5 - 242 = 18.5 mL

We have

[tex]density = \frac{194.3}{18.5} \\ = 10.5027[/tex]

We have the final answer as

Hope this helps you

Answer:

Chemical reaction often involved changes energy due to the breaking and formation of bonds. Reaction in which energy is released are exothermic reaction,while those that take in heat energy are endothermic.

I hope I'm not late, but it's "Cooler air over land moves toward the water, where it is warmed by radiation.​"