Chemistry High School
This model is the simplest model.
- Electron sea model in metals is a model that explains properties of metals. For example the electrons move freely in the metallic structure which makes metals good electrical conductors. Drifting electrons makes metals malleable and also because cations slide easily over each other.
- The metallic bond results from the attraction between the sea of electrons and the positively charged nucleus of atoms of these metals. This model explains that cations are in fixed points within the mobile sea of electrons.
This model is the simplest model.
(This is the answer just took the test)
An atom of lithium (Li) forms an ionic bond with an atom of chlorine (Cl) to form lithium chloride. How are the valence electrons of these atoms rearranged to form this bond? A. A few valence electrons are shared between the atoms.
B. Many valence electrons are shared between the atoms.
C. Electrons are transferred from the chlorine atom to the lithium atom.
D. Electrons are transferred from the lithium atom to the chlorine atom.
Answer: Option (D) is the correct answer.
Atomic number of lithium is 3 and electrons in its shell are distributed as 2, 1. Atomic number of chlorine is 17 and electrons in its shell are distributed as 2, 8, 7.
Thus, we can see that lithium has 1 extra electron and chlorine has deficiency of 1 electron. Therefore, in order to gain stability lithium will transfer its 1 extra electron to chlorine atom.
Thus, we can conclude that electrons are transferred from the lithium atom to the chlorine atom.
its d Electrons are transferred from the lithium atom to the chlorine atom.
Which statement describes a scientific theory? A.A theory states how something behaves without explaining why.
B.A theory is a proven fact that cannot be changed.
C.A theory changes based on new observations and testing.
D.A theory is based on a single hypothesis or observation.
C) is the best description, although a scientific theory is not necessarily a "fact". They are, however, based on evidence.
A) is complete garbage.
B) is a good description of a scientific "law"- something that predicts how a certain event will occur without explaining why this is (for instance, the law of gravity accurately describes the gravitational forces between two bodies, but does not explain why these forces are there).
D) is a scientific "hypothesis"- an explanation for an observed phenomena that is yet to be proven.
The correct statement is C) A theory changes based on new observations and testing.
A) A theory states how something behaves without explaining why.
FALSE because a theory is actually a statement that explains why an observed phenomenon happens. A statement or an observation of how something behaves without explanation is a scientific law, not a theory.
B) A theory is a proven fact that cannot be changed.
FALSE because a theory may be changed or proven false if new evidence that contradicts or debunks the existing theory comes to light. An example is the development from Classical Mechanics to Special Relativity to the Theory of General Relativity with each subsequent theory providing explanations to situations the preceding could not.
C) A theory changes based on new observations and testing.
TRUE because a theory is only valid when a lot of data support it. If new observations challenge the theory, then it may be changed or abandoned.
D) A theory is based on a single hypothesis or observation.
FALSE because a theory is considered as the best explanation for a phenomenon so far. For it to be considered the “best” it has to have been peer-reviewed and repeatedly tested and verified by the scientific community.
- hypothesis brainly.com/question/2681563
- scientific method brainly.com/question/550083
- scientific law brainly.com/question/942536
Keywords: theory, scientific method
Anne adds granulated sugar to water and stirs it until all the sugar dissolves, leaving a sweet, transparent liquid. Under which category should she classify that liquid?
She should be classified under a solevent. Hope this helps
Which element is placed in the same period as ruthenium but has a higher atomic number than it? bismuth osmium silver zirconium
The element that is placed in the same period as ruthenium but which has a higher atomic number than it is SILVER.
In the periodic table, a period refers to an horizontal row of elements. All the element in a particular period always have the same number of atomic orbitals. Ruthenium and silver are in the same period and they have the same number of atomic orbital but have different atomic numbers. The atomic number of silver  is higher than that of ruthenium  because silver has higher number of protons more than ruthenium. Remember that, the number of proton of an element determines its atomic number and the elements in the periodic table are arranged based on increased atomic number.
The answer is silver because its in the same transition metal placement and row as the ruthenium metal
What happens to temperature and kinetic energy of particles during a change of state
When a substance is changing state, its temperature remains constant. This is because energy is used to increase/decrease kinetic energy of the molecules of the substance, increasing/decreasing the inter-molecular distance and overcoming the energy bonds present between the molecules. Therefore, no energy is used to raise the temperature of the substance and therefore it remains constant
In the reaction between bromine and sodium, a bromine atom gains an electron. What ion is formed? Is the bromine oxidized, or is it reduced?
Answer: The ion formed after the reduction of bromine is
The electronic configuration of Sodium (Na) =
The electronic configuration of Bromine (Br) =
From the above configurations, Sodium ion will loose 1 electron in order to gain stable electronic configuration and that electron is accepted by the Bromine atom because it is 1 electron short of the stable electronic configuration.
Bromine atom is reduced to form
Reduction reactions are the reactions in which the element gain electrons.
Oxidation reactions are the reactions in which the element looses its electrons.
Ion formed for bromine = Br-
And it's reduced in that case as it gained an electron
Write the name and symbol of the si units for mass length volume and temperature
The name and symbols of all the SI units are:
- Mass: kilogram (kg)
- Length: meter (m)
- Volume: cubic meter (m^3)
- Temperature: kelvin (K).
What are SI units?
The International System of Units also called to as the SI system or simply the SI is the most frequently used system of measurement in the world today. It is abbreviated SI in all languages. There are three types of measurement systems, the international, British, and US customary systems.
The SI unit of mass is kilogram and grams. The length is measured in meters and kilometers. The volume can be measured in cubic meters. Temperature is measured in kelvin and Celsius.
Thus, the symbols and name:
- Mass: kilogram (kg)
- Length: meter (m)
- Volume: cubic meter (m^3)
- Temperature: kelvin (K).
To learn more about SI units, refer to the link:
Mass: kilogram (kg)
Length: metre (m)
Volume: cubic metre (m^3)
Temperature: kelvin (K)
write a balanced chemical equation depicting the formation of one mole of pocl3(l) from its elements in their standard states.
Thank you for posting your question here at brainly. Below is the answer:
At 25 C and 1 atm pressure (the standard state): P is a solid, O2 is a gas, and Cl2 is a gas.
P(s) + O2(g) + Cl2(g) ==> POCl3(l)
To make 1 mole of POCl3, we need to start with 1 mole of P, 1/2 mole of O2, and 3/2 mole of Cl2.
P(s) + 1/2O2(g) + 3/2Cl2(g) ==> POCl3(l)
NOTE: Some people write P as P4(s), in which case you would need 1/4 mole P4.
First off, it's important to identify the constituent elements of the Compound.
From the compound, we can identify the following elements;
Phosphorus (P), Oxygen (O) and Chlorine (Cl)
So we have;
P + O + Cl --> POCl3
The standard states of elements are the phases that they adopt at a Temperature of 25°C and Pressure of 1 atm.
For POCl3, the standard form of P is P4 (s) while O2 (g) for O and Cl2 (g) for Cl. With this, we now have;
P4 + O2 + Cl2 --> POCl3
Upon balancing, we have;
P4 + 2O2 + 6Cl2 --> 4POCl3
The above equation shows 4 moles of POCl3, since the question stated one mole, we now have;
1/4 P(s) + 1/2 O(g) + 3/2 Cl(g) -----> POCl3 (l)
a certain metal hydroxide, m(oh)2, contains 32.8% oxygen by mass. what is the identity of the metal m?
Total mass = x
It would be: x*32.38/100 = 32
x = 3200/32.38 = 97.56
Atomic mass of (OH)2 = 34
So, remaining mass = 97.56-34 = 63.56
which is approximately equal to mass of copper
So, we can say m is copper here, and formula of the compound would be Cu(OH)2
A laboratory procedure calls for making 410.0mL of a 1.2M NaNO3 solution. What mass of NaNO3 (in g) is needed?
The mass of NaNO3 needed is 41.82 grams
The molarity of a compound is defined as the number of moles of the substance in 1 liter of solution. Then, from this definition and using a rule of three, it is possible to calculate the amount of moles present in 410 ml. Remember that 1 L = 1000 ml, then 410 ml = 0.410 L
If 1.2 moles of NaNO3 are present in 1 L of solution, how many moles are in 0.410 L of solution?
moles of NaNO3=0.492
And the molar mass of the compound can be calculated by adding the atomic mass of each element present in the compound, taking into account the present amount of each:
- Na: 23 g/mol
- N: 14 g/mol
- O: 16 g/mol
mass of the compound NaNO3= 23 g/mol + 14 g/mol + 16*3 g/mol
mass of the compound NaNO3=85 g/mol
Then, a new rule of three can be applied to calculate the mass of NaNO3 sodium nitrate needed: if in 1 mole they represent 85 grams of sodium nitrate, how many moles are in 0.492 moles?
necessary mass of NaNO3=41.82 grams
The mass of NaNO3 needed is 41.82 grams
The pressure of a gas in a container is 152mm Hg. This is equivalent to ____ 0.2atm
A.) It is equivalent to 0.2 atm
A chocolate chip cookie is an example of what? element compound heterogeneous mixture homogeneous mixture
Heterogeneous mixture because you can see the things that make up the cookie
I strongly believe the answer isheterogeneous mixture also the word chocolate cookie drew me in
Which refers to a mixture that contains more than one phase in which the characteristics of the particles vary throughout the mixture? compound element heterogeneous homogeneous
Explanation: Element is a pure substance which is composed of atoms of similar elements. Example:
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.Example:
Mixtures are heterogeneous materials as they do not have uniform composition and the components are not evenly distributed throughout the material and there is a distinct boundary. Example: Sand in water
Homogeneous mixtures are those in which components are evenly distributed throughout the material and thus there is no distinct boundary.Example: Milk in water
The correct answer isheterogeneous
Which geologic era are we living in? paleozoic precambrian cenozoic mesozoic
We are living in "COENOZOIC ERA".
Water bugs walk on water, some razor blades can float on water, and water forms droplets. Are these examples of viscosity, surface tension, or vapor pressure? A. Viscosity
B. Vapor pressure
C. Surface tension
C.) Surface Tension, Because water can hold a certain amount of pressure/weight before the object sinks
A light microscope that has two or more lenses is called a ____________________ (compound, simple) microscope.
That is called COMPOUND microscope....
Compound microscope. uwu
Containers of three different liquids,A,B,C were opened to the air. All three has the same volume to begin with, but the contents of A disappeared very rapidly while the contents of C were the last to disappear. Which liquid has the lowest vapor pressure? A) liquid a
B) liquid b
C) liquid c
I believe that it would be liquid C because vapor pressure is the pressure a vapor applies to its solid or liquid form
Term used by geologists for water that soaks into the ground, fills the openings in the soil, and trickles into cracks and spaces in rock layers
GROUNDWATER is the term used for water that soak into the ground, fills the openings in the soil and trickles into cracks and spaces in rock layers.
Groundwater is usually found underneath the earth surface in the spaces and cracks in sand, rock and soil. It is stored in aquifers. Ground water usually connect with various water bodies such as oceans, rivers and streams and it is always a natural source of water for vegetation. Ground water is a very important natural resource.
Ground Water because it seeps into the ground.
What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remains after 3.0 years? a.) 3.5 years
b.) 4.5 years
c.) 1.5 years
d.) 2.5 years
The half-life of the radioactive isotope is 1.5 years.
The given parameters;
- Original mass of the sample, N₀ = 500 g
- Remaining mass of the sample, N = 125 g
- Time of decay, t = 3 years
The half-life of the radioactive isotope is calculated as;
Thus, the half-life of the radioactive isotope is 1.5 years.
Learn more here:brainly.com/question/17113302
C.) 1.5 years.
500 divided by half twice = 125, so there are two half lives. In 3.0 years, two half lives would equal 1.5 years.
Determine whether a closed spiral notebook with no writing would be chiral or achiral.
Achiralobject is one that is not superimposable on its mirror image. Conversely, an achiral object is one that is identical (superimposable) to its mirror image. I believe a closed spiral notebook is a chiral object. Hope this answers the question. Have a nice day.
Which Statement Describes The Electron Sea Model For Metallic Bonding? -This Model Involves Electrons? ›
In metallic bonding, the valence electrons of the metal atoms are delocalized and arrange themselves as a "sea" of electrons allowing these electrons to move freely. This model explains how metals are good conductors of electricity and heat.Which is a characteristic of the electron sea model for metallic bonding quizlet? ›
Which is a characteristic of the electron sea model for metallic bonding? Molecular orbitals overlap to produce bands.What is the metallic sea of electrons? ›
In the “electron sea” model, atoms in a metallic solid lose their outer electrons and form a regular lattice of positive metallic ions. The outer electrons do not “belong” to any atom but form a pool or sea of delocalized electrons that are free and move randomly throughout the fixed lattice of positive ions.What group of elements are described by the electron sea model? ›
Bonding in metals is often described through the "electron sea model". Metal ions are surrounded by delocalized electrons. Delocalized electrons are not restricted to one atom or another; they are distributed across several atoms in the solid.Which statement describes the valence electrons in metallic bonds? ›
Which statement describes the valence electrons in metallic bonds? They are shared among many atoms. What is a three-dimensional structure that represents the alternating pattern of particles in a crystal?What describes the electron sea model for metallic bonding? ›
This model proposes that all the metal atoms in a metallic solid contribute their valence electrons to form a "sea" of electron. The electrons present in the outer energy levels of the bonding metallic atoms are not held by any specific and can move easily from one atom to the next.Which is a characteristics of the electron sea model for metallic bonding? ›
Metallic bonds are characterized by the overlap of outer orbitals where electrons are allowed to move freely from atom to atom in the sea of electron model. This free movement of delocalized electrons makes this type of bond unique as compared to ionic and covalent bonds where electrons must exist in fixed orbitals.Why are metals described as having a sea of electrons quizlet? ›
Metal atoms typically contain a small amount of electrons in their valence shell compared to their period or energy level. These become delocalised and form a Sea of Electrons surrounding a giant lattice of positive ions.Which best describes metallic bonding? ›
It may be described as the sharing of free electrons among a structure of positively charged ions (cations). Metallic bonding accounts for many physical properties of metals, such as strength, ductility, thermal and electrical resistivity and conductivity, opacity, and luster.What do electrons do in metallic bonds? ›
A metallic bond shares electrons but unlike ionic bonds, it does not fill the valence shell octets of the bonding atoms. All of the electrons involved form one huge electron cloud which all the nuclei share. The attraction of the nuclei to the electrons keeps them together.
In the early 1900's, Paul Drüde came up with the "sea of electrons" metallic bonding theory by modeling metals as a mixture of atomic cores (atomic cores = positive nuclei + inner shell of electrons) and valence electrons. Metallic bonds occur among metal atoms.What are the limitations of the electron sea model of metallic bonding? ›
Limitations of the Electron Sea Model
Even though “Electron Sea Model” answers many properties of metals, some aspects like resistance to electrical conductance” and solid state insulators cannot be explained by the electron sea model.
The sea of delocalized electrons contains only valence electrons, not core electrons. Valence electrons occupy the outermost energy level of an atom, while core electrons occupy inner energy levels.How are the electrons in metallic bond described? ›
It means that the electrons are not localized to a single atom as with a conventional covalent bond, but rather they are delocalized over several atoms. Individual metal atoms in a metallic bond do not have sole 'ownership' of electrons, instead they are shared between several other metals atoms. Hope that helps.What are the electrons that are involved in metallic bond called? ›
In short, the valence electrons in metals, unlike those in covalently bonded substances, are nonlocalized, capable of wandering relatively freely throughout the entire crystal.What electrons are involved in metallic bonds? ›
In a metallic bond, the valence electrons are delocalised, meaning that an atom's electrons do not stay around that one nucleus. In a metallic bond, the positive atomic nuclei (sometimes called the “atomic kernels”) are surrounded by a sea of delocalised electrons which are attracted to the nuclei (see figure below).What are the characteristics of electrons in a metallic bond? ›
The electrons are free to move within a metallic bond and they carry a negative charge. The movement of the electron coupled with its charge results in the conductivity of the compound (conductivity is the movement of charge). 3. The bonds between metal atoms can be easily broken and then formed again.Which of the following characterizes a metallic bond? ›
Answer and Explanation: Metallic bonds are characterized by pools of delocalized electrons. Valence electrons are shared between multiple metal atoms. But instead of staying near their owner, these electrons form a cloud around all of the metal ions.Which of these bonds is characterized by a sea of electrons? ›
Metallic bonding occurs between atoms that have a small number of electrons in their valence shells. They give the electrons up, not just to one other atom, but to the complete group of atoms. We think of the electrons as becoming loose. Positively charged atoms sitting in a sea of electrons.Are metallic bonds held together by a sea of electrons? ›
Metallic bonding is often described as an array of positive ions in a sea of electrons. The metal is held together by the strong forces of attraction between the delocalised electrons and the positive ions.