Answer:
C) lattice of neutral atoms with delocalised electrons
Explanation:
Fact 1: metals are elements and therefore they contain atoms that are electrically neutral
Fact 2: in all atoms, the electrons are delocalised/ are free moving electrons (as the electrons serve their purpose in different forms depending whether you look at it the chemistry way or physics way)
metals are solid and hence they have a lattice structure
(tho at my school we focus on giant ionic lattice structure when explaining based on ionic compounds so i can't guarantee that 'giant ionic lattice structure' and 'lattice structure' are the same, hence i just stick with lattice structure for this explanation ^^)
explanation for other options:
they said negative/positive ions which is not true since atoms are electrically neutral
only when the atoms undergo chemical reactions will they be charged
acetylcholine released at the heart will slow the rate of action potential generation. from this information you know that
By activating M₂ muscarinic receptor, acetylcholine released at the heart will slow the rate of action potential generation.
What is acetylcholine?Acetylcholine is the neurotransmitter used at the neuromuscular junction—in other words, it is the chemical that motor neurons of the nervous system release in order to activate muscles. This property means that drugs that affect cholinergic systems can have very dangerous effects ranging from paralysis to convulsions.
What is action potential?An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a "spike" or an "impulse" for the action potential. The action potential is an explosion of electrical activity that is created by a depolarizing current.
Why acetylcholine released at the heart will slow the rate of action potential?Acetylcholine slows the heart rate by activating the M2 muscarinic receptor (M2R) that, in turn, opens the acetylcholine-activated potassium channel (IK, ACh) to slow the firing of the sinus node.
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Which of the electron transitions involves the most energy? Explain why this transition involves the most energy based in your understanding of the attractive forces between the electrons and protons in the atom
The attraction between the electron and the atom's nucleus grows stronger as it travels closer to it. The electron goes to a lower potential energy. The electron transition involves the most in n=6 and n=2.
More energy must be changed for a larger movement. The electric charge of the electron, a subatomic particle, is a negative one elementary charge. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically considered to bepotential energy.
The energy that an object retains due to its position in relation to other objects, internal stresses, electric charge, or other factors is known as potential energy in physics.
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The x-ray has a frequency of 1.4 x 1019 Hz. What is the energy associated with one x-ray? A. 2.1 x 1052 J
B. 4.7 x 10-53 J
C. 2.1 x 10-¹¹ J
D. 9.3 x 10-¹5 J
I would have to go with D
Hope this helps
Answer:
just give the other person brainliest
Explanation:
a system is compressed from 50 l to 5 l at a constant pressure of 10 atm. what is the amouint of work done?
When a system is compressed from 50 liters to 5 liters at a constant pressure of 10 atmospheres, how much work is done must be determined. Therefore, worked on is equal to p delta v less. P stands for pressure and refers to atmosphere. Therefore, we must convert it to newtons per square meter.
The equivalent of 10 atmosphere is 10 times 10 1, 3, and 5. The final volume and its beginning volume are the Newton perimeter square and changing volume. The total number of letters is five.
Additionally, we must afterwards convert into meter cube. Now, one letter equals ten to the power three minus m cube. In order to get 15 times 10 to the power of 3 meter cube, we increase it by 10 to the monastery's -50 L.
What is Constant pressure ?volume-temperature (constant pressure) When pressure is constant, a gas's volume and temperature are directly inversely related. When pressure is constant, the volume to temperature ratio remains constant. The term "Charles' law" or "Gay-law" Lussac's refers to this relationship.
When we say that the gases are under constant pressure, we mean that the pressures do not change depending on where we are in the cylinder. Both gases fill the entire space and, as you mentioned, exert different pressures. The partial pressure of a gas is the pressure it exerts within a mixture.
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The molar mass of Na2SO4 is
142.04 g/mol.
What is the mass of 4.54 moles of
Na2SO4?
[?] g Na2SO4
The mass of 4.54 moles of Na₂SO₄, given that it has a molar mass of 142.04 g/mol is 644.77 grams
How do I determine the mass of Na₂SO₄?We know already that the mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
Applying the above formula, we can obtain the mass of 4.54 moles of Na₂SO₄. This is illustrated below:
Molar mass of Na₂SO₄ = 142.02 g/mol Mole of Na₂SO₄ = 4.54 molesMass of Na₂SO₄ = ?Mole = mass / molar mass
4.54 = Mass of Na₂SO₄ / 142.02
Cross multiply
Mass of Na₂SO₄ = 4.54 × 142.02
Mass of Na₂SO₄ = 644.77 grams
Thus, the mass of 4.54 moles of Na₂SO₄ is 644.77 grams
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which of the following changes occur when an acid solution of unknown concentration is titrated with a standardized solution of naoh? select all that apply. multiple select question. the color of the indicator slowly changes over the course of the titration. the ph of the acid solution decreases. the concentration of h ions in the acid solution decreases. the ph of the acid solution increases.
The colors of the starting solutions differ in case of high and low concentrations, because the titrations start at different pH values.
The colors of the starting solutions vary in case of high and coffee concentrations, due to the fact the titrations start at distinctive pH values. In case of excessive concentrations, the starting color is of brilliant pink red, converting to purple orange all through innovative titration.
The signs have a chemical structure which can soak up mild beneath positive pH conditions and both change shade or grow to be colorless below other pH situations. This normally happens because of a exchange in protonation of the purposeful group of the molecule.
Whether an answer is acidic or simple can be measured at the pH scale. When everyday indicator is brought to a solution, the color change can indicate the approximate pH of the solution. Acids purpose universal indicator option to trade from green in the direction of crimson.
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a solution is made using 200.0 ml of methanol (density 0.7920 g/ml) and 567.1 ml of water (density 1.000 g/ml). what is the mass percent of the methanol?
The mass percent of the methanol is 21.83%.
The parameter
Methanol volume = 200.0 mlThe density of methanol = 0.7920 g/mlWater volume = 567.1 mlThe density of water = 1.000 g/mlCalculate the mass of methanol and water.
[tex]\rho = \frac{m}{V}[/tex]
m = ρ × V
Where m is a mass (kg), ρ is the density (kg/m³), and V is volume (m³)
m₁ = mass of methanol = 0.7920×200.0Mass percent of the methanol
= [tex]\frac{mass \: of \: methanol}{mass \: of \: solution} \times 100\%[/tex]
= [tex]\frac{m_1}{m_1 + m_2} \times 100\%[/tex]
= [tex]\frac{158.4}{158.4 + 567.1} \times 100\%[/tex]
= [tex]\frac{158.4}{725.5} \times 100\%[/tex]
= 0.2183 × 100%
= 21.83%
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carbon footprint: given that fossil fuel combustion is the largest source of anthropogenic carbon dioxide emission worldwide, which fuel is most responsible for this emission?
Combustion of coal is the largest source of anthropogenic carbon dioxide emission worldwide given by the carbon footprints.
What are carbon footprints?
Carbon footprints are the total amount of emissions of green house gases by a product, place or an event. The main of this is to take actions against the emission of greenhouse gases and reduce them. It is estimated that burning of 1 Kg coal can give about 2.42Kg of carbon dioxide.
Combustion of coal releases more carbon dioxide than burning petroleum products or natural gas in the whole worldwide. Carbon dioxide is the most important greenhouse gas contributing to the global warming. Coal is considered to be having the highest carbon footprints out of all the energy sources.
Therefore, coal combustion gives out the highest carbon footprint giving the highest carbon dioxide worldwide.
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todd is attempting to finish an extraction begun by his lab partner. at this time, his separatory flask contains water and toluene, with benzylamine, 1,3-diphenylacetone, and phenol dissolved in the toluene layer. to separate out the benzylamine, he should add:
HCl can be added to separate benzylamine from the toluene mixture.
A widely used method of separating two liquids from each other or popularly called liquid-liquid extraction is being implemented here.
The knowledge of pH values helps in treating the contents of the solution that is to be extracted and their subsequent isolation as well Here, the concept of acid-base extraction is applied to understand that the separation of benzylamine which is an organic base can be done by extracting it by adding HCl to the solution. The addition of hydrochloric acid leads to the formation of a corresponding ammonium salt, the amine can be later recovered by adding a base thereby converting the formed compound back to benzylamine.
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Complete and balance the double replacement reaction between calcium acetate and lithium phosphate.
Answer:
2Li3PO4(aq) + 3Ca(C2H3O2)2(aq)
- - - > Ca2(PO4)2(s) + 6LiC2H3O2(aq)
The temperature, pressure, and precipitation conditions of the atmosphere for a specific place on a given day is called , whereas a longer term view of these same factors, typically taken over a period of many years, is called.
The temperature, pressure, and precipitation conditions of the atmosphere for a specific place on a given day is called weather, whereas a longer-term view of these same factors, typically taken over a period of many years, is called climate.
We can describe the weather of the place as the temperature or atmosphere of a place on a certain day. On the other hand, the climate is the long-term weather condition of a place. The climate describes the average weather of the place.
A climate tends to remain unchanged for a place over several years whereas the temperature is the regular day-to-day change in the atmospheric conditions.
The climate of a region is determined by the average atmospheric conditions of a place that are recorded and observed over a long period of time.
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Which statement correctly explains how matter is conserved in chemical reactions? (1 point)
A. The number of atoms in the reactants is always equal to the number of atoms in the products.
B. The states of matter of the reactants are always the same as the states of matter of the products.
C. The number of reactants is always equal to the number of products.
D. The number of molecules in the reactants is always equal to the number of molecules in the products.
Li = Li+ + e- oxidation or reduction?
Neutral lithium is oxidized and changed into Li+ at the anode. When the electrons from the anode reaction are received at the cathode, this causes the reduction of Co(IV) to Co(III).
What is the function of oxidation?The biological aerobic system (BOD) of wastewater is decreased after oxidation, which also lessens some contaminants' cytotoxicity. Some contaminants undergo this treatment and are transformed into dioxide, water, and sludges. Disinfection is commonly accomplished using chemical oxidation.
What causes oxidation?The reaction brought on by coming into touch with oxygen molecules is known as oxidation. These materials can be non-metals like live tissues or metals. Technically speaking, oxidation is the removal of one electrons during the phase of interaction between two or more atoms.
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A(n) ____________________ is one that contains two, and only two, elements.
Answer:
It is a Binary Compound
Explanation:
Answer:
[binary compound]
Explanation:
A(n) A binary compound is one that contains two, and only two, elements.
a given molecule has six electrons in bonding orbitals and two anti-bonding orbitals. what is the bond order for the molecule?
Two anti-bonding orbitals and six electrons in bonding orbitals make up the bond order of the given molecule, which is 2. In the orbital theory, the bonding orbital is used to describe interactions.
The formula for determining bond order is given below. 1/2 (electrons in bonding molecular orbitals - electrons in antibonding molecular orbitals) (electrons in bonding molecular orbitals - electrons in antibonding molecular orbitals) Bond length and strength are revealed by bond order. A shorter bond length is typically correlated with higher bond order. The fact that there are more bonds between the atoms explains this.
Half of the difference between the number of bonding and antibonding electrons is another definition of bond order in molecular orbital theory.
Bond order is 1/2. (electrons in bonding orbitals - electrons in anti-bonding orbitals.)
Bond order is 1/2. (6-2)
bond order is two.
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4.why benzoic acid showed a smaller rf value than 9-fluorenone in the tlc result? explain thoroughly for full credit.
Benzoic acid showed a smaller rf value than 9-fluorenone in the TLC result because of its different attraction phase, stationary phase, and mobile phase.
The Rf esteem depends on the stationary stage and portable stage of the TLC plate. The Rf esteem of a compound changes based on how pulled it is to the stationary and versatile stages.
As a rule, the stationary stage is silica gel, which is very polar, so the versatile stage is moderately non-polar.
Benzoic corrosive is moderately polar since it incorporates a carboxylic corrosive bunch. So, it would have a moo Rf value on a TLC plate with silica gel as the stationary stage and hexane as the versatile stage.
The Rf esteem on a TLC plate with silica gel as the stationary stage and 60:40 hexane: ethyl acetic acid derivation as the versatile stage.
The benzoic corrosive would be more pulled into the generally polar 60:40 hexane: ethyl acetic acid derivation than the non-polar hexane portable stage.
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for a given sample of ch3oh , the enthalpy change during the reaction is 82.7 kj . what mass of methane gas is produced?
For a given sample of ch3oh , the enthalpy change during the reaction is 82.7 kj. The mass of the methane gas will be 32 gram.
When methanol will provide some temperature, then it will break into methane and oxygen gas and release some amount of energy.
The balanced chemical equation can be written as:
[tex]2CH_{3}OH[/tex]→ [tex]2CH_{4} + O_{2}[/tex], ΔH= 82 kJ
It can be seen that 2 mole of methane will produce 82 kj energy.
Hence, the energy of 82.3kj the count of mole could be = (2×82.3)/82
= 2 moles
The mass will be equivalent to the = 2 × 16 = 32 g
Therefore, the mass of [tex]CH_{4}[/tex] produced will be 32g
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When sample X'is passed through a filter paper a
white residue, Y, remains on the paper and a clear
liquid, Z, passes through. When liquid Z is
vaporized, another white residue remains. Sample
X is best classified as
Sample X is best classified as a heterogeneous mixture
Homogenous mixture has the same uniform composition and appearance through out the reaction and it is difficult to separate the substrates present in it.
A heterogeneous mixture contains of visibly different phases or substances. Here separating the mixture becomes easy.
In the given question When sample X is passed through the filter paper we see that a white residue is remaining which is Y. This itself suggests that the the mixture is heterogeneous mixture.
As we initially got the residue it suggests that the solution is a homogenous mixture as we can now differentiate two substances
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two unknown mineral samples, a and b, are rubbed against each other. mineral a scratches mineral b. what can you infer about the minerals?
Mineral A scratches mineral B, we can infer from here that Mineral A is more harder than Mineral B.
The minerals are the naturally occurring chemical compounds which are found in the earth's layers. Minerals have different properties.
If mineral A is rubbed against mineral B and Mineral A scratches mineral B, we can infer from here that the mineral A is harder than mineral B.
The hardness of the minerals is because of the intermolecular forces between the particles of the minerals. The mineral A might be having strong intermolecular forces in comparison with the mineral B.
This is why when rubbed against each other, the mineral A scratches the particle of the mineral B which has lower intermolecular forces between the particle of the mineral B.
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Complete question - Two unknown mineral samples, A and B, are rubbed against each other. Mineral A scratches mineral B. What can you infer about the minerals?
O Mineral A is harder than mineral B.
O Mineral B is harder than mineral A.
O Mineral A is more dense than mineral B
Mineral B is denser than mineral A.
a 5.00 g sample of a compound containing only chlorine and oxygen contains 1.94 g of chlorine. what is the empirical formula of this compound?
The empirical formula of this compound is ClO₇.
If a 5.00 g sample of a compound containing only chlorine and oxygen contains 1.94 g of chlorine, then the mass of its oxygen is the difference between the mass of the sample and the mass of its chlorine.
mass compound = mass oxygen + mass chlorine
mass oxygen = mass compound - mass chlorine
mass oxygen = 5.00 g - 1.94 g
mass oxygen = 3.06 g
Determine the number of moles of each component by dividing the mass by its respective molar mass.
moles oxygen = mass oxygen / MM
moles oxygen = 3.06 g / 15.9994 g/mol
moles oxygen = 0.1912571721
moles chlorine = mass chlorine/ MM
moles chlorine = 1.94 g / 70.9060 g/mol
moles chlorine = 0.02736016698
Get the ratio between the two components to determine its empirical formula.
moles oxygen : moles chlorine = 0.1912571721 : 0.02736016698
moles oxygen : moles chlorine = 7 : 1
Hence, he empirical formula of this compound is ClO₇.
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4) the density of a liquid was determined by the automatic pipette method. a 100-ul automatic pipette was used. the liquid had a mass of 0.082 g. what was the density in grams per ml of the liquid?
Using the automatic pipette method, the density of the liquid is 0.82 g/ml.
Density, denoted by ρ, is the property of a substance which determines whether it will sink or float. It is the ratio between the mass of the substance and its volume. It can be calculated using the formula below.
ρ = m/v
where ρ = density
m = mass
v = volume
Given that a 100-μl automatic pipette was used, then the volume of the liquid is 100 μl.
1 µL = 0.001 mL
100 µL = 0.1 mL
Plug in the values and solve for the density of the liquid.
ρ = m/v
ρ = 0.082 g / 0.1 mL
ρ = 0.82 g/ml
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what is math and science?
Mathematics and science are formal and exact sciences that are based on logic.
What is math and science?Mathematics is an exact science that studies the properties and relationships between entities through geometric figures and arithmetic with numbers. Mathematics then looks for common patterns that could end up leading to a theory and, if it is verifiable and true, end up being a law, such as the Pythagorean law for example.
In terms of science, it is the comparable knowledge that has been studied, explained, and has helped predict social and natural phenomena in our universe over time. This has been done and verified through the scientific method, making it then a verifiable and true logic.
Therefore, we can confirm that mathematics and science are formal and exact sciences that are based on logic.
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ice cubes are added to an insulated cup of hot water. as a result, the temperature of the water decreases and the ice melts. what statement best explains the change in entropy of the system, which is the combination of water and ice cubes, on a molecular level?
The entropy of the system increases according to increase entropy principle
The Increase in Entropy Principle states that for any process the total change in entropy of a system together with its enclosing adiabatic surroundings is always greater than or equal to zero.
The measure of a system's thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.
So hence when ice cubes are added into a insulated cup of hot water it decreases the temperature and the ice melts
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If 2 isotopes of Osmium existed, Os-190 and Os-191, which one would have the highest percent abundance?
The isotope that has the highest percent abundance is Os-190.
What is the relative atomic mass of Osmium?We know that the amount of the element that can be found in the universe does differ because the element is composed of isotopes. The isotopes are the atoms of the element that have the same atomic number but does have different mass numbers.
Now we know that the two common isotopes of osmium are Os-190 and Os-191. The isotope that would have the highest percent abundance is the isotope whose mass is closer to the relative atomic mass of osmium which is 190.23.
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The force between electrically charged particles depends on the magnitude of each charge, their separation distance, and what else?.
When charged matter is placed in an electromagnetic field, it experiences a force due to its physical attribute of electric charge.To understand more about the force between electrically charge particles, we should grasp the idea of Coulomb's Law. It explains that the interaction between charged items is a non-contact force that operates over some distance.On the other hand, magnetic forces could also be generated by moving electric charges. It is categorized as a force due to the motion of the charged particles.
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Does alcohol really burn off when cooking? what are the possible substitutions for alcohol in recipes?.
Answer:Does alcohol really burn off when cooking? what are the possible substitutions for alcohol in recipes?
Explanation:
The longer you cook, the more alcohol cooks out, but you have to cook food for about 3 hours to fully erase all traces of alcohol. A study from the U.S. Department of Agriculture's Nutrient Data lab confirmed this and added that food baked or simmered in alcohol for 15 minutes still retains 40 percent of the alcohol.
a solution containing a large concentration of dissolved ions can be classified as a(n) . a solution containing a large concentration of dissolved ions can be classified as a(n) . solvent weak solution electrolyte unsaturated solution suspension
An electrolyte is a solution containing a large concentration of dissolved ions.
A solution containing a large concentration of dissolved ions is called an electrolyte. It mainly consists of dissolved cations ,anions. Some of the most important and commonly discussed electrolytes are
Calcium which plays a pivotal role in bone health in the body and muscle contraction and relaxation.
Sodium, which is responsible for maintaining osmolarity and nerve impulse conduction, the lack of sodium ions in the body may lead to Hyponatremia.
Potassium is another important electrolyte which is responsible for normal heart function and skeletal growth.
Chloride ions which are in close coordination with sodium ions in the body help in maintenance of the body's blood pressure. It can be obtained from tomatoes, olives, etc.
The shortage of these electrolytes in the body can cause physiological problems like tiredness, lethargy, sleeplessness and improper growth in case of children. Hence it is crucial for us to include all the electrolytes in our diet and have foods that are rich in water and electrolytes to stay healthy and fresh.
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what atomic or hybrid orbital on the central p atom makes up the sigma bond between this p and an outer cl atom in phosphorous pentachloride, pcl5 ?
In phosphorous pentachloride, also known as pcl5, the central p atom's hybrid orbital, designated Sp3d, forms a sigma bond with an exterior cl atom. The P molecule hybridization is indicated by the symbol sp3d.
To create 5 P-Cl sigma bond in this situation, the P atom needs 5 orbitals. It needs to create the fifth sigma bond using one of its three 3d orbitals because it has three 3s and two 3p orbitals. These orbitals are combined to create five sp3d orbitals, making a triangular bipyramid. The process was referred to as hybridization, and it was characterized as the redistribution of the energy in the individual atoms' orbitals to create new orbitals with equivalent energy. The new orbitals are created and given the term hybrid orbitals. Is known as hybridization.
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Complete the following nuclear reaction equ
1.
155
63
Eu → e +
0
-1
Nuclear equation: ninety-two 238 U → ninety 234 T h + 2 4 H e + power.
In nuclear physics and nuclear chemistry, a nuclear response is a method in which two nuclei, or a nucleus and an external subatomic particle, collide to supply one or greater new nuclides. accordingly, a nuclear response need to purpose a transformation of at the least one nuclide to some other.
Nuclear Fusion reactions electricity the sun and other stars. In a fusion response, two light nuclei merge to form a single heavier nucleus. The method releases strength due to the fact the whole mass of the resulting single nucleus is less than the mass of the two unique nuclei. The leftover mass turns into energy.
Nuclei with too many neutrons, too few neutrons, or which might be absolutely too massive are risky. They eventually rework to a stable form thru radioactive decay. wherever there are atoms with risky nuclei, there are nuclear reactions taking place clearly.
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how do the minerals differ from one another how are they alike?
Minerals are similar as they always have a specific chemical structure throughout the entire mineral and are all solids at normal temperatures while they can be different due to their physical properties.
What is a mineral?Minerals are naturally occurring solid substances. They can be made from a single element (like gold) or from a combination of elements (Sodium and Chlorine). The Earth is made up of thousands of different minerals.
Types of MineralsMinerals are often divided into two groups: silicates and non-silicates. Silicates are minerals that contain silicon and oxygen.
The rest of the minerals are classified into a group called non-silicates.
Some important non-silicate minerals include:
Carbonates - Carbonates contain carbonate (CO3) combined with some other element.Halides - Halides contain a halogen element as the main element. Oxides - Oxides are minerals where the main element is oxygen. Sulfides - Sulfides contain sulfur and one or more metals or semi-metals. Other elements such as copper, gold, diamond, graphite, and sulfur can be classified as a third group of minerals.Characteristics of MineralsSolid - All minerals are solids at normal temperatures on Earth.Natural occurrence - Minerals occur in nature. Inorganic - Minerals don't come from plants, animals, or other living organisms.Fixed chemical structure - Specific minerals will always have the same chemical formula and the same combination of elements. Minerals also are generally formed with a crystal structure.In conclusion, minerals are very similar to each other but also differ in their physical properties even if they all exist in the form of crystals.
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