Sodium benzoate is a widely used food preservative. The type of cell that can utilize sodium benzoate as a carbon and energy source is pseudomonas cell.
What are pseudomonas cells?Psuedomonas cells are simple cell. They are gram-negative or gram-positive bacteria. These cells infect humans, animals, and plants.
They grew on fruits and vegetables. They also infect or contaminate food. So they are very harmful to all living organisms.
Thus, a common food preservative is sodium benzoate. Pseudomonas cells are the only kind of cell that can use sodium benzoate as both a carbon and an energy source.
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What is the chemical formula of quartz, calcite, hematite, pyrite, gold, and copper? which group of minerals do they belong to? what are the most common tests to differentiate calcite from quartz?
The chemical formulas and groups of the given minerals are as follow:
Quartz : Sio2 (Silicate)
Calcite : CaCO3 (Carbonate)
Pyrite : FeS2 (Sulfide)
Gold : Au (Native Elements)
Copper : Cu (Native Elements)
A piece of quartz can scratch a sample of calcite, however calcite can't scratch quartz. If you have a sample if each, attempt to scratch one sample with the other to look at the distinction in the hardness. You also can take a look at the hardness of these two minerals using a pocketknife.
Quartz is the second most abundant mineral in Earth's crust after feldspar. It occurs in nearly all acid igneous, metamorphic, and sedimentary rocks. It is an essential mineral in such silica-rich felsic rocks as granites, granodiorites, and rhyolites.
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Around 1750 Benjamin Franklin knew of two opposite types of electric charge, produced by rubbing a glass rod or amber rod with fir. He decided that the charge developed on the glass rod should be "positive" charge, and from there on charges were defined. What would have changed if Franklin had decided the amber rod was the positive charge?
If Benjamin Franklin had decided to call the charge on the amber rod positive, nothing would have changed only that we would have a different convention for identifying charges.
What would have changed?We know that electricity has to do with the flow of current, there are fundamentally two kinds of charge, a positive and a negative charge. We know that the kind of charge that a material carries is arbitrary.
As we can see here, it was Benjamin Franklin in 1750 that defined the charge on the glass rod and the charge on the amber rod as negative. If Benjamin Franklin had decided to call the charge on the amber rod positive, nothing would have changed only that we would have a different convention for identifying charges.
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Instead rudy consumes 500 ml of orange juice (ph 3.3), who has consumed more hydrogen ions?
Rudy consumes 2.5 ×[tex]10^{-4}[/tex] moles hydrogen ions.
What are ions?
A negatively charged ion called an anion has more electrons than protons compared to a positively charged ion called a cation. The electrostatic force causes opposite electric charges to be drawn towards one another, causing cations and anions to attract one another and easily form ionic compounds.
Atomic or monatomic ions are those made up of just one atom, whereas molecular or polyatomic ions are those made up of two or more atoms. Physical ionization occurs when molecules spontaneously collide in a fluid (gas or liquid), producing "ion pairs" that each contains a free electron and a positive ion. Chemical reactions, such as the dissolution of a salt in liquids, can also produce ions.
Rady consumes 500 ml of organic juice of [tex]p^{H}[/tex]
3.3
[tex]p^{H}[/tex] = 33
- log [[tex]H^{+}[/tex]] = 3.3
[[tex]H^{+}[/tex]] = [tex]10^{-3.3}[/tex]
[[tex]H^{+}[/tex]] = 5.01 x [tex]10^{-4}[/tex] M
Volume of organic juice = 500ml = 0.5L
Mole of [tex]H^{+}[/tex] ions = 2.5 ×[tex]10^{-4}[/tex] moles
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If two atoms are joined by a polar covalent bond, the shared electrons will tend to stay closer to the atom with ______.
If two atoms are joined by a polar covalent bond, the shared electrons will tend to stay closer to the atom with the higher electronegativity
What is electronegativity?An atom's ability to attract the electrons of a bond is known as its electronegativity, and it rises as this propensity does. A covalent bond is formed when two coupled atoms with the same electronegativity values are in close proximity to one another.
In a chemical bond, the more electronegative atom often attracts the electrons more than the other atom. A polar covalent bond is the result of this. The electrons are not at all shared if the electronegativity values are drastically different. To create an ionic bond, one atom effectively accepts the bond electrons from the other atom.
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Students in a class all make measurements and then calculate the density of the same metal block. During analysis, they find that their data are neither accurate nor precise. explain how several factors may have contributed to these problems.
The factors might include:
faulty measuring tool or instrumentrandom error by the studentsnot accounting for temperature changesWhat is Error in measurement?
Error in Measurement can be defined as difference in value between the actual value and the measured value.
There are some factors that might have contribute to the inaccuracy in the measurement of the metal block and they include :
faulty measuring tool or instrumentThe students may have have used a faulty instrument or an inaccurate instrument. The accuracy of the measurement will depend on the kind of scale they used. A kitchen scale, for example, is probably less accurate than a calibrated scale in a chemistry lab.
random error by the studentsRandom errors occurs when there might have been an error due to inability to read the accurate value of the instrument.
not accounting for temperature changesDensity varies with temperature and their might have been slight changes in temperature leading to inaccuracy in the readings.
In conclusion, errors can be mitigated by taking into account when we make a measurement by reporting an uncertainty value.
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paulo is experimenting with H2O in its different states. He would like to present all the information he collected in one place. He thinks he should use a phase change diagram, but he isn’t sure. What information could you give Paulo to encourage him to use a phase change diagram?
The phase diagram makes it possible to predict the stability of any of the phases of water based on the diagram..
What is a phase diagram?Water is able to exist in three phases; solid, liquid and gas. The reason behind the phases of water is the fact that there are different degrees of intermolecular interactions that exists in the various phases of water.
Thus, on the phase diagram, of is easy to trace the the regions of temperature and pressure that corresponds to the solid, gaseous and liquid states of a given substance that could be used to make deduction about the substance.
The phase diagram shows the interaction between the various phases of water on the same diagram. This makes it possible to predict the stability of any of the phases of water based on the diagram.
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Convert 175mm to centimeters
Answer: 17.5 cm
Explanation:
10 mm=1 cm
175mm * 1 cm/10 mm=
175/10 cm=17.5 cm
H2po4-1 has a pka of 6.86. if the concentration of h2po4-1 is 0.622 mm and the concentration of h1po4-2 is 0.038 mm what is the ph of the solution?
H2po4-1 has a pka of 6.86. if the concentration of h2po4-1 is 0.622 mm and the concentration of h1po4-2 is 0.038 mm the ph value in the solution is 8.3
pH stand for potential hydrogen the pH of a solution also can be determined by finding the pOH. determine the concentration of the hydroxide ions by dividing the molecules of hydroxide by the volume of the solution and here to find pH value in the solution here the formula is
pH=pka log acid/base
ph=pka log h2po4-1/h1po4-2
ph=6.86×log0.622/ 0.038
ph=6.86×log16.36
ph=6.86×1.21
ph=8.3
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Classify each of the following as ionic or molecular, and name each: a. fepo3 b.cl2o7 c.br2 d.ca3(po4)2 e.pcl3 f.al(clo2)3
a. fepo3 - Iron phosphite - Ionic
b.cl2o7 - Chloline heptoxide - Molecule
c.br2 - Bromine - Molecule
d.ca3(po4)2 - Calcium phosphate - Ionic
e.pcl3 - Phosphorus trichloride - Molecule
f.al(clo2)3- Aluminum Chlorite - Ionic
What are ions?The term "ion" refers to an atom or molecule with a net electrical charge. The charge of an electron is typically regarded to be negative; it is equivalent to and opposes the charge of a proton, which is typically thought to be positive.
An atom or collection of atoms with an electric charge is known as an ion. Cations are the name for positive-charged ions. Anions are the name for ions that have a negative charge. The body contains several common chemicals as ions. Sodium, potassium, calcium, chloride, and bicarbonate are typical examples.
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a. fepo₃ - Iron phosphite - Ionic
b.cl₂o₇ - Chloline heptoxide - Molecule
c .br₂ - Bromine - Molecule
d.ca₃(po₄)₂ - phosphate - Ionic
e .pcl₃ - Phosphorus trichloride - Molecule
f. al(clo₂)₃- Aluminum Chlorite - Ionic
What are ions?
The term "ion" refers to an atom or molecule with a net electrical charge. The charge of an electron is usually regarded to be negative; it is equivalent to and opposes the charge of a proton, which is usually thought to be positive.
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The molecular formula for glucose is c6h12o6. what would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions?
The formula for glucose is C₆H₁₂O₆. by multiplying the molecular no of 1 glucose molecule by 3 we get 18 carbon and 36 hydrogen and 18 oxygen molecule. i.e. C₁₈H₃₆O₁₈
Elaborate:
It features a molecular formula of C ₆ H ₁₂ O ₆ When HI is heated for a long time, n-hexane is formed which indicates that all the six carbon atoms are linked in a straight chain.
The oxime is formed when glucose reacts with hydroxylamine and cyanohydrins with the addition of hydrogen cyanide to it.
What is a molecular formula?
The formula is the formula showing the actual number of each atom in a molecule.
How may be a molecular formula written?
A formula uses chemical symbols and subscripts to indicate the exact numbers of different atoms in a molecule or compound. An formula gives the simplest, whole-number ratio of atoms during a compound. A molecular formula indicates the bonding arrangement of the atoms in the molecule.
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Which statement about Niels Bohr's atomic model is true?
Correct answer is Each orbit has a specific energy level.
According to Bohr's atomic model There is a certain energy for each orbit, with the inner orbit having the lowest energy. As you move farther from the nucleus, the energy of the orbits increases. We can say that the energy of the electrons are quantized if we state that they can only have certain energies.The ground state, also known as the lowest orbit, is where the electron typically resides.A lower energy level to a higher energy level is reached by an atom's electrons by gaining the necessary energy, and a higher energy level to a lower energy level by losing energy.Inner energy levels have low energy and outer or higher energy levels have high energy.Therefore, Correct statement is Each orbit has a specific energy level.
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The complete question is mentioned below:
Which statement about Niels Bohr’s atomic model is true?
a) Higher orbits have lower energies.
b) Each orbit has a specific energy level. c) Electrons can exist in any energy level. d) Orbits close to the nucleus have no energy.
From the information provided in this module, when should emergency response training be provided?
From the knowledge provided in this module, emergency response training should be provided before starting work and as periodic refresher training.
What does routine refresher training entail?
Refresher training is applicable to all learning domains. This tactic is particularly important in compliance and safety training, as businesses typically have regulations for yearly or irregular reviews. Regular sessions make sure that students are continuously updated on the most recent information as well as intricate organizational procedures and processes.
Who needs to be trained on emergency action plan components?
OSHA mandates that all employees receive training on the emergency action plan. When any of the following occurs, employees must receive training: A job is initially given to an employee. The plan's requirements for an employee change.
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42.0 ml of 0.130 m naoh and 37.6 ml of 0.360 m naoh. assume that the volumes are additive.
Mixed molarity is 0.254 M
The volumes are additive is 1.22 M
Part A
mixed molarity = (M1 V1 + M2V2 )/ V1+V2
= (0.150 x 42 + 0.370 x 37.6 ) / (42+37.6)
= 0.254 M
NaOH = 0.254M
[Na+ ]= 0.254M
[OH-]= 0.254M
Part B
[Na+] = 2 x 44 x 0.1 / 44 + 25
= 0.1275 M
{SO4-2] = 44 x 0.1 / 44 + 25 = 0.063 M
[K+] =25 x 0.17 / 44 + 25 = 0.062 M
[Cl-] = 25 x 0.17 / 44 + 25 = 0.062 M
Part C
KCl moles = 3.70 / 74.55 = 0.0493
KCl molarity = 0.0493 / 0.075 = 0.66M
[K+] = 0.66 M
[Ca+2] = 0.280 M
[Cl-] = 0.66 + 2 x 0.280 = 1.22 M
Volume is a measurement of three-dimensional space that is occupied. Numerous imperial units or SI-derived units, such as the cubic meter and liter, are frequently used to quantify it numerically (such as the gallon, quart, and cubic inch). Volume and length (cubed) have a symbiotic relationship. The volume of a container is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the amount of fluid (liquid or gas) that the container may hold.
Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardized containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes.
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Which feature is shared by all three-carbon monosaccharides?
The features are shared by all three-carbon monosaccharides, They are all pentoses. In their linear forms, they all contain carbon carboxyl and several hydroxyl functional groups. In their linear forms, they all contain a carbonyl and several hydroxyl functional groups.
Carbon is used in some form in almost every industry in the world. It is used as fuel in the form of coal, methane gas, and crude oil (used to make gasoline). It is used to make all sorts of materials, including plastics and alloys such as steel (a combination of carbon and iron).
Life on Earth cannot exist without carbon. This allows carbon to readily form bonds with other atoms, giving it flexibility in the forms and functions that biomolecules such as DNA and RNA can adopt, and is essential for growth and replication, the defining properties of life. This is partly due to
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A chemist measures the amount of fluorine gas produced during an experiment. He finds that 3.8 g of fluorine gas is produced. Calculate the number of moles of fluorine gas produced. Round your answer to 2 significant digits.
Answer:
0.10
Explanation:
Molar mass of F2 gas = 38 g/mol.
Moles of F2 gas = 3.8/38 g/mol
=0.1
Rounded to 2 significant digits is 0.10.
0.10 moles F2 has been produced.
Identify the difference between sterile water (sw) and bacteriostatic water, if any.
Use only sterile water, as was previously indicated. Water is made bacteriostatic by adding benzyl alcohol. You can immediately decide which is suitable based on allergies.
If you are allergic to benzyl alcohol, avoid using or drinking bacteriostatic water altogether and opt for sterile water.
Another distinction is with indications. The FDA regulates the purposes for which drugs are used or what is disclosed on their labels. While sterile water is designated for both irrigation and injection, bacteriostatic water is only intended for injections.
The difference of several uses, as has previously been established, is crucial. Due to the absence of a bacteriostat, sterile water can only be utilized once.
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Molecules with only single bonds do not generally exhibit liquid-crystalline properties because?
Because they lack the stiffness required for alignment, molecules with only single bonds do not generally display liquid-crystalline characteristics. One or more atoms make up a molecule. The biological substances, such as proteins and DNA, can be composed of thousands of the atoms.
A molecule is composed of atoms that have been joined together. So, whereas an atom is a separate thing, a molecule is generated when those atoms come together. These elements are may be the same, such as the two oxygen atoms bonded together (O2), or they may be different atoms linked together, such as the water (H2O).
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What would be the number of na , k and atp molecules inside the cell after 100 cycles of the pump and what would be the net charge differential across?
The number of sodium, potassium and ATP would be: 700 Na+ ions, 200 K+ ions and 900 ATP molecule.
The net charge differential would be -200.
Potassium is important for keeping the body hydrated and with sodium support cellular function (sodium-potassium ( Na⁺/K⁺) pump).
The sodium-potassium pump releases three Na+ ions, while in the same time two K+ ions exit the cell. For this process one molecule of ATP is consumed.
Inside the cell, there are 1000 sodium ions, 1000 molecules of ATP.
While outside the cell, there are 1000 potassium ions.
After 100 cycles, 300 sodium ions will exit the cell and 200 potassium ions will enter the cell, using 100 ATP molecules.
1000 - 300 = 700; number of sodium ions (Na+) left in the cell
1000 - 100 = 900; ATP molecules left in the cell
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The mass of an atom doesn't include the mass of the electrons because?
a) of their negative charges
b) electrons are so small they don't really add any weight
c) they are outside the nucleus
I'm sure but a or c I'm sure
Calculate the ph of 1.0 l of an aqueous solution containing 75 mmol of mes (pka = 6.09) and 25 mmol of its conjugate base.
The pH of 1.0 l of an aqueous solution containing 75 mmol is 5.61
Here we calculate pH value
Given data is aqueous solution containing 75 mmol (pka = 6.09) and 25 mmol of its conjugate base
pH = pKa + log [A-]/[HA]
pH = 6.09 + log (25 mM/75 mM) = 6.09 - 0.48 =5.61
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The ratio of the mass in grams of fluorine to the mass in grams of iodine in the three compounds is:_______
The ratio of the mass in grams of fluorine to the mass in grams of iodine in the three compounds is 13.49
Fluorine mass in grams is 134.9 g and iodine mass in grams is 10.0 g so here the ratio of this two in the three compound is 134.9/10.0=13.49
The mass of ratio of florine and iodine is 13.49
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An element that has the electron configuration 1s22s22p 4 has how many electrons?
Electrons ruminate around the nucleus in particular circular path known as orbit called shell.
Electronic configuration is the dispense of electrons.
Electronic configuration is also known as electronic structure.
Also termed as spatial methodize.
More than one orbital in the electron shell is known as subshell, they have similar energy level.
In Electronic configuration there are four shell present namely k,l,m,n and there are 4 sub-shell namely s,p,d,f.
As we know that every subshell fills gradually s max 2 electrons p - 6 , d - 10 and f - 14.
So,
According to questions,
Thge element has configuration 1s2 2s2 2p4 hence 8 electrons.
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What multiplicities are observed for the signals in the off-resonance decoupled 13c nmr spectrum of (2e)-3-chloroacrylaldehyde?
A singlet, a triplet, and a quartet multiplicities are observed for the signals in the off-resonance decoupled 13c NMR spectrum of (2e)-3-chloroacrylaldehyde
A spectrum is defined as the characteristic wavelengths of electromagnetic radiation (or parts thereof) emitted or absorbed by an object or substance, atoms or molecules. Multiple: Spectrum. A spectral line is an otherwise smooth and continuous spectral dark or bright line resulting from the emission or absorption of light in a narrow frequency range compared to adjacent frequencies.
These applications include Voice of America broadcasting, weather services, radar and voice communication systems for controlling commercial and civil air and sea traffic, weather satellite systems, flood warning and water control systems, and time signals.
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All of the following are clues that a chemical reaction has taken place except:_______
a. a color change occurs.
b. a flame occurs.
c. the reactant is smaller.
d. bubbles form.
e. a solid forms.
Explanation:
a color change occurs cause when it Colides it mixes in with the other color and changes it completely
The correct answer is option C . Clue that a chemical reaction has taken place is not that the reactant is smaller.
Let's break down each of the options to understand why option c is incorrect:
a. A color change occurs: When a chemical reaction occurs, there may be a change in color. For example, when iron rusts, it changes from a metallic silver color to a reddish-brown color.
b. A flame occurs: Some chemical reactions produce heat, and if the reaction is exothermic enough, it can produce a flame. For instance, when wood burns, a flame is produced as a result of a chemical reaction between the wood and oxygen.
c. The reactant is smaller: This statement is incorrect. A chemical reaction does not necessarily mean that the reactant becomes smaller. Reactants can combine to form a larger product or they can rearrange to form different molecules without changing their size.
d. Bubbles form: When a gas is produced during a chemical reaction, bubbles may form. For example, when vinegar (acetic acid) reacts with baking soda (sodium bicarbonate), carbon dioxide gas is released, causing bubbles to form.
e. A solid forms: Some chemical reactions involve the formation of a solid. For instance, when a metal reacts with a non-metal, such as sodium reacting with chlorine to form sodium chloride, a solid salt is formed.
Thus, clues that a chemical reaction has taken place include a color change (option a), a flame (option b), bubbles forming (option d), and a solid forming (option e). The incorrect option is c, which states that the reactant becomes smaller.
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If 40 kcal of heat is added to 1.0 kg of water, what is the resulting temperature change?
The resulting temperature change is: 40 degrees c
Here given heat added to system 40kcl
Weight of water 1kg we know the specific heat of water is
S= 4.2 J/g \degree c=1 cal/g\degree c
Q=40kcal m=1.0 kg=4000 g
We have the heat transfer equation given by
Q= ms\Delta t where Q=heat energy m=mass
\Delta t=change in temperature
Put the values and we'll have a change in temperature
\Delta t= [tex]\frac{Q}{ms}[/tex]
\Delta t= 40 degree C
Temperature is a numerical expression of how hot a substance or radiation is.
There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are not defined by theoretical principles but rather by useful empirical properties of particulate matter.
A thermometer is used to determine temperature. It is calibrated using different temperature scales that historically defined themselves using different reference points and thermometric substances.
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When 10.286 g of a compound containing only carbon and hydrogen was burned completely in 38.265 g of oxygen, 33.264 g of carbon dioxide and some water were formed. calculate the mass of water.
Mass of water = 15.287 grams.
The equation here will look like this:
CxHy + O2 ------->CO2 + H2O
Hydrocarbon (contains c' and 'H' alone) and O2 are the reactants in this reaction.
Water and carbon dioxide are products.
Since mass cannot be created or destroyed in an isolated system, we now know this to be true. Although it is conserved, it can change forms.
Therefore, for chemical reaction
The mass of the reactants and the mass of the products must match. Here, just forms are altered to create the product.
Consequently, according to the Mass Law of Conversion:
Mass of Reactants = Mass of Products, we might say.
[(Mass of CO2) + (Mass H2O ] = [(Mass of Hydrocarbon) + (Mass of 02)]
[10.286 + 38.265] = [33.264 g + Mass of H20]
48.551 = 33.264 + Mass of H2O.
Mass of water equals 48.5519-33.261
The Mass of water will therefore be 15.287 grams.
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2.
A stone has a mass of 1225 g and a density of 65 g/mL. What volume would
it displace if dropped into an overflow can full of water.
If placed into a water-filled overflow, it would displace 18.84 ml.
Why does overflow bother you?Overflowing means to flood something to the point where the liquid spills out the edges. Rivers occasionally exceed their banks after intense downpours, flooding the surrounding area.
Describe density.Density is the measurement of how tightly a substance is packed. It has such definition since it is the mass per unit volume.
Symbol for density: D
Formula for Density: Where is the density, m is the object's mass, and V is its volume, the equation is: = m/V
based on the specified value;
density=65g/ml
mass=1225g
as we know that
D=m/v
so, v=m/d
v=1225/65
=18.84ml
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Answer the following Question Down Below...
The mass number of the atom is 21, the atomic number is 9, and the element is Fluorine. There are 9 protons, 9 electrons, 12 neutrons, and the elemental symbol is F.
Properties of an atomFor every atom:
Protons and neutrons are located in the nucleus and the addition of both equals the mass number of atoms.Electrons are located outside the nucleus, in orbitals.Neutral atoms have the same number of electrons and protonsIn the diagram:
Number of electrons = 9
Number of protons = 9
Number of neutrons = 12
Mass number = 12 + 9
= 21
Atomic number = number of protons
= 9
Element with atomic number 9 = Fluorine
Symbol of the element = F
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Chemical Changes occur when the molecules of a substance are
(Blank) (Blank) and changed into a new substance with new (Blank)
Answer:
when molecules loose or gain electro it get charge and when it get attached with other charge molecules the form bond
ans is loose or gain ,bond
2. From the diagram which of the following represent a break in the
Earth's crust.
O Fault
O Intrusion
O Extrusion
