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Explanation:

Relative molecular mass of CH4 = 12 * 1 + 4 = 16

Relative molecular mass of SO2 = 32 + 10 *2 = 64

tSO2/tCH4 = √MSO2/MCH4

t/20 = √64/16 = √4

t/20 = 2

∴ t = 20 * 2 = 40sec

Answer:

Proton: A positively charged particle found in the nucleus of an atom. A proton contributes one atomic mass unit to the total atomic weight of an atom.

Explanation:

Answer:

A proton

Explanation:

A proton is a positive charge found in an atom

Explanation:

tan(-300) = tan(-300+360) = tan (60)

here we added 360 degree. where by adding 360 +or- (n×360) to the any angle nothing will change as they called equivalent angles

equivalent angles is by adding +or- n×360 to any angle is equivalent to that angle so tan(-300) = tan(60) then we will calculate tan(60) on the calculator

Answer:

Curd is acidic in nature, because an acidic substance has less value of pH. A milkman adds a very small amount of baking soda to fresh milk. Why does he shift the pH of the fresh milk from 6 to slightly alkaline? Answer: By making the milk more alkaline, it takes more time to turn into curd.

Answer:

Density stays the same

Explanation:

The density remains the same because cutting the object in half will divide the mass & volume by the same amount. Also, the density of a substance remains the same no matter what size it is.

Answer:

Researchers have found evidence of an existing body of liquid water on Mars.

What they believe to be a lake sits under the planet's south polar ice cap, and is about 20km (12 miles) across.

Answer:

Both Nickel (Ni, 28, 58.69) and Technetium (Tc, 43, [98]) have these features in common:

There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, nickel (Ni) and technetium (Tc) belongs to d block element.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Both Nickel (Ni) and Technetium (Tc) have these features in common:

Both are transition metals that is belong to d block

Both have two electrons in valence shell

Electronegativity value of these elements are same

Therefore, nickel (Ni) and technetium (Tc) belongs to d block element.

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Answer:

Density=1.0 g/mL

Volume=2.0 L

Mass=?

Density=mass/volume

Mass=density*volume

Mass=1.0*2.0

Mass=2g

Answer:

Yea I don't see any answers below but when you do I would love to help too!

Explanation:

Answer:B

Explanation:

Answer:This chapter begins the first where we will look at matter on a microscopic scale.  Matter is made of small particles of atoms or molecules.  There are three common states of matter, solid, liquid and gas.  A gas and a liquid will change shape to fit the shape of their container.  A gas will change volume to fit the volume of the container.

Explanation:

In general, solids are denser than liquids, which are denser than gases. . The particles in the solid are touching with very little space between them. The particles in a liquid usually are still touching but there are some spaces between them. The gas particles have big distances between them.

Solid – In a solid, the attractive forces keep the particles together tightly enough so that the particles do not move past each other.   Their vibration is related to their kinetic energy.  In the solid the particles vibrate in place.

Liquid – In a liquid, particles will flow or glide over one another, but stay toward the bottom of the container. The attractive forces between particles are strong enough to hold a specific volume but not strong enough to keep the molecules sliding over each other.

Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other.  In most cases, there are essentially no attractive forces between particles.  This means that a gas has nothing to hold a specific shape or volume.

(A fourth state of matter, called plasma, exists when a gas becomes ionized. Plasma exists inside stars and in interstellar gases.)

Answer:

Dmitri Mendeleev

Explanation:

In 1869, just five years after John Newlands put forward his Law of Octaves, a Russian chemist called Dmitri Mendeleev published a periodic table. Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful.

Answer:

VIIA group donot form ions or react with other elements. This group is also called noble gases or inert gases which donot take part in chemical reaction.

Answer:

Heavy elements are created by fusing two elements together in a lab. They look for “events” that comprise a series of alpha decays that result in spontaneous fission.

Explanation:

Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, in below given ways we can summarize how heavy elements are created.

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.

Elements heavier than iron cannot be created by fusion because the reaction requires energy to occur. We do, however, perceive elements other than iron all around us. This is accomplished by supernova explosions, which result in neutron capture processes and the production of heavy materials.

Therefore, in above ways we can summarize how heavy elements are created.

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Answer:

The substance has a density of 2.636 grams per mililiter.

Explanation:

We must remember that density ([tex]\rho[/tex]), measured in grams per mililiters, is the mass of the substance ([tex]m[/tex]), measured in grams, divided by its volume ([tex]V[/tex]), measured in mililiters. That is:

[tex]\rho = \frac{m}{V}[/tex]

In addition, a kilogram equals 1000 grams and a liter equals 1000 mililiters. If we know that [tex]m = 1713.2\,g[/tex] and [tex]V = 650\,mL[/tex], then:

[tex]\rho = \frac{1713.2\,g}{650\,mL}[/tex]

[tex]\rho = 2.636\,\frac{g}{mL}[/tex]

The substance has a density of 2.636 grams per mililiter.

Answer:

False

Explanation:

It will actually speed it up

Answer:

b

Explanation:

Answer: Sand

Explanation: Out of all the choices, sand is the only one that cannot react with other substances.

Answer:

sand

Explanation:

all are used mostly in cookin and preparing things and are in the kitchen

Answer:

No.

Explanation:

No, convection does not occur if Earth's mantle were a box 30 km on a side because convection needs medium for the movement of heat energy from one place to another. Convection and conduction are two processes which needs medium for its movement while radiation does not need any medium for its movement. If there is a empty space present between two substances so convection does not occur.

Answer:

Five.

Explanation:

The third principal energy level has one s orbital, three p orbitals, and five d orbitals, which can each hold up to 10 electrons. This allows for a maximum of 18 electrons.

Answer:

I don't understand you question

Answer:

D.  

They have a positive charge and are present in the nucleus of an atom along with the neutrons.

explanation:

Protons have a positive charge.

Answer:

One way creativity is helpful to scientists is when they need to come up with a experiment or cure for something their imaginastion is very helpful. The reason for that is with creativity they could get answers much quicker!

Explanation:

Answer:

I agree with that answer

Answer:

the answer is [Rn]7s25f14 (first option)

Explanation:

i took the test

The electronic configuration for nobelium (No) is [Rn]7s²5f¹⁴, hence the correct option is A.

The distribution of an element's atoms' electrons throughout several atomic orbitals is symbolically represented by the electronic configuration of that element.

A standardized nomenclature is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript.

The atomic number of nobelium (No) is 102.

The number of protons is equal to the atomic number, which is 102.

The number of electrons is equal to the number of protons, which is 102.

Therefore, electronic configuration for nobelium (No) is [Rn]7s²5f¹⁴.

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The given question is incomplete, so the most probable complete question is,

Which is the electron configuration for nobelium (No)?

A. [Rn]7s²5f¹⁴

B. [Rn]7s²5f⁷

C. [Ne]3s²3p⁷

D. [Xe]6s²5d¹

Answer:

250 cm³

Explanation:

V = l × w × h

V = (5) × (5) × (10)

V = 250 cm³

Answer:

it A

Explanation:

ed 2020

Answer:

did not

Explanation:

ask

Answer:

The density of the cube is 0.5g/mL. Hoped this helped! :)

Explanation:

V= 12.0mL                                                                D=M/V

M= 6.0g

D= 6.0g/12.0mL

D= 0.5g/mL

Answer:

A

Explanation:

More electrons than protons, thus giving the atom an overall charge of -2