Definition: This is a measure of the quantity of matter.
Example: Yours may be 65 kilograms. You measure it with an analytical balance.

Answer:

I think it is more that one is correct, so sorry if I'm wrong, if it isn't, it is one of the electron bonding ones

Answer:

2CH4= 2+8 = 10 atoms

10Mg(OH)2 = 5 atoms

5Al2(SO4)3 = 85 atoms

3 H2O = 9 atoms

Explanation:

Answer:liquid

Explanation:it’s not a plasma or a gas bc their high and it’s not a solid bc that’s very low it’s a liquid

Answer:

Solid

Explanation:

In a solid, the particles pack together as tightly as possible in a neat and ordered arrangement. The particles are held together too strongly to allow movement from place to place but the particles do vibrate about their position in the structure.

Answer:

P₂ = 1.5 atm

Explanation:

Given data:

Initial volume = 270 cm³

Initial pressure = 1atm

Final volume = 180 cm³

Final pressure = ?

Solution:

The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

1 atm × 270 cm³= P₂ × 180cm³

P₂ = 270 atm.  cm³/ 180cm³

P₂ = 1.5 atm

Explanation:

The forms of thermal energy transfer are;

Thermal energy is a form of kinetic energy that causes the particles of a medium to begin to move.

Answer:hey... do you still check this..?

Explanation:

Answer:

smallest to largest:

Electron, Neutron, Atom, Molecule, Nucleus

Explanation:

sorry if it's not right

Electron--Neutron--Nucleus-- atom--Molecule is the order from smallest to largest.

Electron is the smallest subatomic particles having the radius is about 9.1× 10−31 kg while on the other hand, the size of neutrin is 1.7×10−15 meters. Both neutron and proton are present in the nucleus so nucleus is bigger than neutron. Nucleus is present inside an atom so atom is bigger than nucleus whereas atom is smaller than molecule.

So we can conclude that Electron--Neutron--Nucleus-- atom--Molecule is the order from smallest to largest.

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Answer:

what I'm not really understand this question

The frequency of radiation : 1.2 x 10¹⁵ Hz

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves

c = speed of light

= 3.10⁸  m/s

λ = wavelength

Wavelength-λ is 2.51 x 10⁻⁷m

The frequency :

[tex]\tt f=\dfrac{3.10^8}{2.51\times 10^{-7}}=1.2\times 10^{15}[/tex]

Answer:

You can infert that it has a mass of 40 grams.It also has desnity of 40 grams per millilieter.

Explanation:

The volume of water raised from the glass is equal to the density of the object which displaces water. Hence, 40 g/ml is the density of the rock.

The Greek mathematician and inventor Archimedes discovered the physical law of buoyancy, which states that any body completely or partially submerged in a fluid (gas or liquid) at rest is subject to an upward, or buoyant, force whose magnitude is equal to the weight of the fluid displaced by the body.

The volume of fluid that has been displaced is equal to the volume of an object that is completely submerged in the liquid or to the portion of the volume below the surface for an object that is only partially submerged.

Therefore, the density of the rock is equivalent to the volume of water level raised in the glass. Thus density of rock is 40 g/ml.

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Answer:

B or C

Explanation:

the two maybe try it

Answer:

It has the same number of protons and electrons

Explanation:

Answer:

An air mass that is described as having warm and moist air is called maritime tropical. This occurs when heat and moisture are transferred to the overlying air from the warm waters of the ocean or seas. Maritime Tropical air mass comes from the warm waters of the tropics and the Gulf of Mexico. When warm air moves northward moist air is transported to the United States which causes the increase in precipitation. Maritime Tropical masses are often felt in the Southeast part of the United States.  

Explanation:

Answer:

Number of electrons

Explanation:

An atom is made up of three fundamental subatomic particles called protons, neutrons and electrons.

Protons are the positively charged particles in an atom.

Neutrons do not carry any charges

Electrons are negatively charged.

 Both protons and neutrons occupy the tiny nucleus. The extra-nuclear space is filled with electrons.

Answer:

omgggggggg

Explanation:

help

Answer:

[tex]186.5\ \text{K}[/tex]

Explanation:

[tex]V_1[/tex] = Initial volume = 0.05 L

[tex]V_2[/tex] = Final volume = 0.1 L

[tex]T_1[/tex] = Initial temperature

[tex]T_2[/tex] = Final temperature = 373 K

From the ideal gas law we have

[tex]PV=nRT[/tex]

So

[tex]V\propto T[/tex]

[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\Rightarrow T_1=\dfrac{V_1}{V_2}\times T_2\\\Rightarrow T_1=\dfrac{0.05}{0.1}\times 373\\\Rightarrow T_1=186.5\ \text{K}[/tex]

The intial temperature is [tex]186.5\ \text{K}[/tex].

Answer:

15.05+7.75÷21×100=

Explanation:

total mass÷atomic nass×100

Answer: A

Explanation:

Answer:

He could separate the mixture through filtration and fractional crystallization. Ethanol can also be added in order to remove salt.

Answer:

See explanation

Explanation:

The question is incomplete. However, base on the given information, one likely question could be that, we calculate the the volume of the nitrogen gas after heating it.

So, we have that:

Initial Volume, V1 = 200mL

Initial Temperature, T1 = 24k

Final Temperature, T2 = 47k

To solve the final volume of the gas, we apply the following ideal gas law equation

V1 * T1 = V2 * T2

Substitute values for V1, T1 and T2

200mL * 24K = V2 * 47K

200mL * 24 = V2 * 47

4800mL = 47V2

Solve for V2

V2 = 4800/47

V2 = 102.13 mL ------- Approximated

Hence, the volume of nitrogen gas after heating is 102.13mL

Answer:

2

Explanation:

Each atom in the bond contributes one valence electron, forming a shared pair in a single covalent bond. Therefore, the correct option is option D.

A valence electron is an electron that is part of an atom's outer shell in chemistry and physics. If the outer shell is open, the valence electron can take part in the creation of a chemical bond.

The electrons in the s and p orbitals are those that are in question. Core electrons are those found in the inner shell. These electrons are vital to the majority of chemical processes because they have higher energy than the electrons in inner orbits. The electrons farthest from the nucleus are the electrons that are  valence electrons of the atom. An atom with 13 total electrons and 3 valence electrons has 10 core electrons.

Therefore, the correct option is option D.

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Answer: Gemstones can have various internal structures, and it often depends on the type of gemstone. Some common internal structures found in gemstones include:

Explanation: Crystalline Structure: Many gemstones are made up of a regular, repeating arrangement of atoms, forming a crystalline structure. These crystals can have different shapes, such as cubic (e.g., diamond), hexagonal (e.g., emerald), or orthorhombic (e.g., peridot).

Amorphous Structure: Some gemstones lack a defined crystalline structure and instead have an amorphous arrangement of atoms. One example is opal, which is composed of tiny silica spheres in a random arrangement.

Inclusions: Gemstones may contain inclusions, which are solid materials trapped within the gem during its formation. Inclusions can be crystals, minerals, or other materials that give the gemstone a unique appearance and character. In some cases, specific inclusions are used to identify gemstones.

Cleavage and Fracture: The way a gemstone breaks or cleaves along planes of weakness is also a part of its internal structure. Cleavage refers to the tendency of some gems to break along specific planes, creating smooth surfaces, while fracture refers to irregular breaks in gemstones.

Color Zones and Banding: Some gemstones display variations in color within their internal structure, either in the form of color zones or banding. For instance, agate is a type of chalcedony with colorful banding.

Optical Phenomena: Certain gemstones exhibit unique optical phenomena due to their internal structures. Examples include asterism (the star effect in star sapphires), chatoyancy (the cat's eye effect), and iridescence (play-of-color seen in opals).

It's important to note that the internal structure of a gemstone can significantly impact its appearance, durability, and value. Gemologists and experts often study these structures to identify and classify gemstones correctly.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{1.9 \times {10}^{46} }{6.02 \times {10}^{23} } \\ = 3.156 \times {10}^{22} [/tex]

We have the final answer as

Hope this helps you