Answer:
21.4
Explanation:
Mass = M/V
42.8/2.0 = 21.4
:)
PLZ HELP Some characteristics of each of the four states of matter are given in the table below.
States of Matter
State Space Between Particles Speed of Particles
1 High High
2 High High
3 Very Low Least
4 Low Medium
Which state of matter does State 3 represent?
Gas
Liquid
Plasma
Solid
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.
What does it mean
"1. A chemical reaction. represents what happens in a chemical"
Magnesium combines with oxygen to form magnesium oxide. If 15.05 g of magnesium reacts completely with 7.57 g of oxygen,
what is the percent by mass of oxygen in magnesium oxide?
Answer:
15.05+7.75÷21×100=
Explanation:
total mass÷atomic nass×100
what is the definition of chemistry
Which type of animal can breed on their own but have undergone physiological or behavioral changes due to captivity?
O Undomesticated animals
O Domesticated animals
O Semi-domesticated animals
O Tamed wild animals
PLZ HELP QUICK!!
Question - A sample of an element is found to consist of two isotopes. The mass and relative abundance of each isotope is: 24.1 Daltons (41.6 %) and 21.1 Daltons (58.4 %). Calculate the Atomic Weight for the element.(3 points - correct work shown, correct number, correct units) *
how many atoms are in the following:
2CH4
10Mg(OH)2
5Al2(SO4)3
3 H2O
Answer:
2CH4= 2+8 = 10 atoms
10Mg(OH)2 = 5 atoms
5Al2(SO4)3 = 85 atoms
3 H2O = 9 atoms
Explanation:
We cooleda water bottle so the volume was lowered to .050 L, then we heated it to 373 K and thevolume increased to .10 L. What was the initial temperature?
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].
Write both the complete electron- configuration notation and the noble-gas notation for iodine, I. How many inner-shell electrons does an iodine atom contain?
Answer:
Iodine has an atomic number of 53
Electronic configuration - 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^5
Noble gas configuration - [kr]4d^10 5s^2 5p^5
Iodine have 7 valence shell electron and 46 inner shell electron in the ground state.
The atomic number of Iodine is 53.
Additionally, the Electronic configuration of Iodine is as follows;
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵The Noble gas notation for Iodine is;
[Kr]4d^10 5s^2 5p^5Ultimately, Iodine is a member of the halogen group of the periodic table and hence, has 7 valence shell electron and 46 inner shell electron in the ground state.
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Can someone help me pls
Answer:
B or C
Explanation:
the two maybe try it
What is the frequency of radiation whose wavelength is 2.51 x 10 -7m?
The frequency of radiation : 1.2 x 10¹⁵ Hz
Further explanationRadiation 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
f = c / λc = 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]
3. An air mass that is cool and dry.
a. Maritime tropical
b. Maritime polar
c. Continental tropical
d. Continental polar
4. An air mass that is warm and moist.
a. Maritime tropical
b. Maritime polar
c. Continental tropical
d. Continental polar
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:
P
n
1. What would be the new pressure if 270 cm 3 of gas at standard pressure
is
compressed to a volume of 180 cm3 ? (n and T = constant)
T V
Initial
Final
Effect
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
Which set of coefficients would balance the following equation
Answer:
3Mg + 2AlCl3 --> 2Al + MgCl2
How many moles are in 1.9 x 1046 atoms of chromium?
Answer:
3.156 × 10²² atomsExplanation:
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
3.156 × 10²² atomsHope this helps you
1. Calculate the mass of iron needed to make 16.25g of iron chloride (3
marks)
2Fe + 3Cl2 → 2FeCl3
Answer:
5.595 g Fe
General Formulas and Concepts:
Chemistry - Stoichiometry
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
16.25 g FeCl₃ (Iron III Chloride)
RxN: 2Fe + 3Cl₂ → 2FeCl₃
Step 2: Identify Conversions
Molar Mass of Fe - 55.85 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of FeCl₃ - 55.85 + 3(35.45) = 162.2 g/mol
Step 3: Stoichiometry
[tex]16.25 \ g \ FeCl_3(\frac{1 \ mol \ FeCl_3}{162.2 \ g \ FeCl_3} )(\frac{2 \ mol \ Fe}{2 \ mol FeCl_3} )(\frac{55.85 \ g \ Fe}{1 \ mol \ Fe} )[/tex] = 5.59533 g Fe
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
5.59533 g Fe ≈ 5.595 g Fe
the table below gives the numbers of protons, electrons, and neutrons in four atoms. based on the table, which atom had a charge of -1
What is not a form of thermal energy transfer
Explanation:
The forms of thermal energy transfer are;
ConductionConvection RadiationThermal energy is a form of kinetic energy that causes the particles of a medium to begin to move.
The average kinetic energy is taken as the heat of the system. Heat energy is usually transferred from a place at higher temperature to one with a lower temperature. Heat transfer by conduction occurs in solids when they are in contact. Heat transfer by convection occurs in fluids by the actual movement of the molecules of the medium. Heat transfer by radiation does not require particles.
A rock dropped Into a glass of water ralses the water level
by 40 milliliters. What can you infer about the rock?
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.
What is Archimedes principle?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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which type of internal structure represents a gemstone.
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.
The diagram represents a section of Earth that a paleontologist, a
scientist who studies fossils, has been working with for years. Which
statement correctly describes this diagram?
a
b
Layer W contains fossils of organisms that existed on Earth after the organisms found in layers U and R.
Layer U contains fossils of organisms that are older than the organisms found in layer R.
Layers W and U contain fossils that are animal species.
Layers R and W contain fossils that are both types of plant species.
C с
Od
Answer: A
Explanation:
HELP ASAP! STUDY ISLAND
Solar energy is energy from the Sun that is converted into thermal or _____ energy. A. chemical B. mechanical C. nuclear D. electrical
Explanation:
done here u gooooooooo
Shyia bestie we have to talk its really important
Answer:hey... do you still check this..?
Explanation:
Help me please ????
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
200 mL of nitrogen gas at 24K is heated to 47K.
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
5 Daniel has dropped two glass jars containing sugar
and salt as he tried to get them down from the
kitchen cupboard. He now has a mixture of glass,
sugar and salt. Describe in detail how he could
separate the three substances. Sugar and salt are
both soluble in water, but only sugar is soluble in
ethanol (remember that ethanol is flammable and
should not be heated directly).
Answer:
He could separate the mixture through filtration and fractional crystallization. Ethanol can also be added in order to remove salt.
why is iron important constructing bridges and houses?
Place the particles in order from smallest to largest.
1Electron
2Molecule
3Neutron
4Nucleus
5 atom
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.
Why electron is smaller?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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HELP ASAP PLS a 35.0 g block of copper is dropped into 450 grams of water
at 21.5 C. The temperature of the water changes to 22.3 C. Does the water's temperature rise or fall?
Answer:
the temperature of the water rises
Explanation:
22.5 < 22.3
how many single covalent bonds does beryllium form in BeCl2?
Answer:
what I'm not really understand this question