True. Elements from Group 2A, also known as alkaline earth metals, form insoluble precipitates with carbonate and chromate anions.
Group 2A elements include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). When these elements react with carbonate (CO3^2-) or chromate (CrO4^2-) anions, they produce insoluble precipitates. For example, when calcium (Ca) reacts with carbonate, it forms calcium carbonate (CaCO3), which is insoluble in water. Similarly, when barium (Ba) reacts with chromate, it forms barium chromate (BaCrO4), which is also insoluble.
The insolubility of these precipitates is due to the strong ionic bonds formed between the cations and anions. This results in a high lattice energy that prevents the dissolution of the precipitate in water. In general, the solubility of ionic compounds decreases as the charges of the ions increase and their size decreases. Group 2A elements tend to form insoluble precipitates with anions such as carbonate and chromate due to these factors.
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Calculate the minimum number of grams of propane. More info for the question in attached photo.
The minimum number of grams of propane for the given question is calculated as 55.39 g.
What is propane?Propane is a three-carbon alkane with molecular formula of C₃H₈. It is a gas at a standard temperature and pressure but is compressible to a transportable liquid.
Given, mass of ice = mass of water = 4.10 kg = 4100 g
and temperature of ice = -16 °C ; Temperature of water = 75.5 °C
Heat required to change ice to water under the specified conditions is:-
As we know, q = q(-16 C to 0°C) + q(fusion) + q (0 C to 75.5 °C)
So q = m*c(ice)*ΔT(ice) + m*ΔHfusion + m*c(water)*ΔT(water)
= 4100[2.03(0-(-16)) + 334 + 4.18(75.5-0)]
q = 2796 kJ
As the enthalpy change for combustion of propane is -2220 kJ/mol
Therefore, now the number of moles of propane corresponding to required energy of 2796 kJ ;
= 1 mole * 2796 kJ/2220 kJ
= 1.259 moles of propane
As we know molar mass of propane = 44 g/mol
So, mass of propane required = 1.259 moles * 44 g/mol
Hence we get, mass of propane required = 55.39 g
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When you lick a popsicle, how does the thermal energy travel between the popsicle and your tongue? What kind of heat transfer is that?
I think its Thermal Energy
H2o has a delta. Hvap = 40. 7 kj/mol. What is the quantity of heat that is released when 27. 9 g of h2o condenses?.
Quantity of heat released = -63.1 kJ
How to calculate 27.9 g of h2o condenses?.Given:
Enthalpy of vaporization of water, ΔHvap = 40.7 kJ/mol
Mass of water, m = 27.9 g
To determine:
The amount of heat (Q) released
The reaction is: H2O(g) ↔ H2O(l)
The amount of heat evolved during condensation which involves a phase transition from vapor to liquid is given as:
Q=n*Delta H vape
n = moles of water
Since this is a condensation process: ΔHcond = -ΔHvap
Q=27.9g/18g mol * -40.7 k j/mol=63.1 k j
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Write an adventure story of a spacecraft that has been launched to study the dwarf planet ceres. What would be a good story?
Once upon a time, there was a spacecraft named "Dawn" that was launched on a mission to study the dwarf planet Ceres. The spacecraft was equipped with state-of-the-art technology and a team of highly skilled scientists and engineers were aboard to control and monitor the mission.
As Dawn approached Ceres, the team was amazed at the vast, barren landscape that stretched out before them. They couldn't wait to start collecting data and analyzing the planet's surface. However, soon after they arrived, they encountered a problem. The spacecraft's landing gear malfunctioned and they were unable to land on the surface.
The team quickly came up with a plan B and decided to study Ceres from orbit. They began to collect data and take pictures of the planet's surface. They were shocked to find that Ceres had a surprisingly varied landscape, with towering mountains, deep craters, and mysterious bright spots.
As the mission continued, the team discovered that Ceres had a subsurface ocean beneath its icy crust. The team was thrilled at this discovery and knew that it would greatly contribute to the understanding of our solar system.
However, just as they were about to wrap up their studies, the team received a distress signal from a nearby spacecraft that was in trouble. Without hesitation, the team of Dawn set course to investigate and assist.
As they neared the other spacecraft, they saw that it was under attack by a group of rogue asteroids. The team of Dawn quickly came up with a plan and using their advanced technology, they were able to defend the other spacecraft and destroy the asteroids.
The other spacecraft, grateful for the help, thanked the team of Dawn and they continued on their journey. The team of Dawn, proud of their bravery and the success of their mission, returned to Earth with a wealth of new data and knowledge about Ceres and the Solar System.
The Dawn spacecraft mission was a great success and it helped scientists understand more about the dwarf planet Ceres, and it also demonstrated the courage, resourcefulness, and the sense of camaraderie of the team.
The purpose of the best-fit line on an experimental scatterplot is to Choose... The best-fit line allows us to Choose...
The best-fit line of an experimental scatterplot is used to identify any linear patterns in the scattered data.
A best fit line serves what purpose?A line of best fit is a straight line that minimizes the distance between it and certain data. The line of best fit is used to represent a connection in a scatter plot with several data points. Regression analysis' byproduct serves as a tool for predicting indicators and price fluctuations.
What is the scatter plot's best-fit line?A scatter plot's data is most accurately represented by a straight line known as the line of best fit. It is possible for this line to pass through some, all, or none of the points.
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What is the mass in grams of 6.02 x10 23 carbon atoms?
6.02 x10^23 carbon atoms have a mass of 12.04 grams.
An element's atomic mass is the average mass of its atoms measured in atomic mass units (amu, also known as daltons, D). The atomic mass is a weighted average of all the isotopes of that element, calculated by multiplying the mass of each isotope by its abundance.
The atomic mass of carbon is 12.0107 grams/mol. Since 1 mole of carbon atoms is equal to 6.02 x 10^23 atoms, the mass of 6.02 x 10^23 atoms can be calculated by multiplying the atomic mass of carbon by 6.02 x 10^23. 12.0107 grams/mol x 6.02 x 10^23 = 12.04 grams. This is the mass of 6.02 x 10^23 carbon atoms.
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Decribe Niel Bohr' model of the atom. Tell what part of the atom are included in hi model and how they are arranged. (2 point)
Neil Bohr's model of an atom as a central nucleus which contain protons and neutrons with the orbits in an circular orbit at specific distances and the electrons in an atom are arranged in shells that surrounds the nucleus.
Bohr model of the atom was proposed by Neil Bohr in 1915. It came into existence with the modification of Rutherford’s model of an atom. Rutherford’s model introduced the nuclear model of an atom, in which he explained that a nucleus which is (positively charged) surrounded by the negatively charged electrons. Electrons in an atom are arranged in shells which surround the nucleus, with each successive shell being farther away from the nucleus. Subshells consist of one or more atomic orbitals and electron shells consist of one or more subshells.
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Which has the highest Zeff for its valence electrons?
F
Li
OC
Na
The highest zeff , effective nuclear charge for its valence electron from the give option is the F with the value of 5.2.
The Zeff can be calculated by the following formula :
Zeff = Z - s
where ,
Z is the atomic number
s is the shielding effect
F = 9 - (0.35 × 6 + 0.85 × 2 )
F = 5.2 for its valence electrons.
Li = 3 - 1.7
= 1.3
O = 8 - ( 2 × 0.85 + 5 × 0.35 )
= 4.5
C = 6 - (2 × 0.85 + 3 × 0.35)
= 3.25
Na = 11 - ( 2 × 1 ) + ( 8 × 0.85 )
Na = 2.20
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the woman is using colorful letters to hold the drawing to the refrigerator. What type of force is pulling the letters toward refrigerator
Answer:
She is using magnetic force
Explanation:
How many sigma bonds and pi bonds does this molecule have?
(CH3)2CCHCH2CCCOOH
The sigma bonds and pi bonds does the given molecule have is :
(CH₃)₂CCHCH₂CCCOOH , 19 sigma bond and 4 pi bond.
The given molecule given below :
(CH₃)₂CCHCH₂CCCOOH
H H H O
| | | ||
H₂ - C - C = C - C - C ≡ C - C - O - H
| |
H - C - H H
|
H
The single bond in the molecule represent the one sigma bond . the double bond in the molecule represent the one sigma bond and the one pi bond. The triple bond in the molecule represent the one sigma bond and the two pi bond.
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The Milky Way galaxy (pictured above) is an example of a(n) ____ galaxy. At the center of the galaxy is a galactic bulge that is around 20,000 light years long. In the very center of the galaxy is a massive ____ that is 4 million times the mass of the sun and has a huge gravitational pull.
A. Spiral, Supernova
B. Spiral, Black Hole
C. Elliptical, Supernova
D. Elliptical, Black Hole
In which type of soil where water drains too rapidly and dry out quickly?
The type of the soil where the water drains too rapidly and it dry our quickly is the sandy soil. The sandy soil has large space between the particles for passing out water through the soil.
The soil that has the large space between the particles , so that the water can pass out quickly and the soil dry out quickly. The sandy soil is has the rough texture. . The sandy soil drains out quickly as compared to the other soil. The sandy soil is very good for the plants as it has the good drainage.
Thus , the soil that drains out too rapidly and dry out quickly is the sandy soil.
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Thompson changed out the
metal and still consistently
observed the same cathode ray.
What did this observation mean
for atomic theory?
A. The atomic is a small hard sphere.
B. The atom is indivisible.
C. The atom contained something small and
negative.
D. The atom is mostly empty space.
Thompson's model concluded that the atom contained something small and negative. The correct option to this question is C.
What is Thompson's model?Thomson's description of the atomic model is one of many scientific models of the atom. Created by J.J. Thomson in 1904, shortly after the electron was discovered. However, the atomic nucleus had not yet been discovered at that time. So he proposed a model based on the known properties available at the time. Known properties are:
Atoms are neutrally charged
Inside an atom are negatively charged particles called electrons. According to the assumptions of Thomson's atomic model, an atom resembles a positively charged sphere with electrons (negatively charged particles) inside.
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Calculate the percent yield of H2 of a reaction that produces 0.50 moles of H2 from 45 grams of HCl and excess Al (aluminum) in the reaction below (which is not balanced):
Al + HCI = AlCl2 + H2
Answer:
Balanced equation:
2 moles of Al react with 6 moles of HCl. 2 moles of AlCl₃ and 3 moles of H₂ are produced.
The answer is C.
When 50.2g of magnesium is combined with 40.8g of oxygen: 1. How many grams of magnesium oxide should be produced.
When 50.2g of magnesium is combined with 40.8g of oxygen, 91 grams of magnesium oxide should be produced.
What is law of conservation of mass?The law of conservation of mass states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.
This law suggests that the amount of reactants of a chemical reaction must equate the amount of products of that reaction.
According to this question, magnesium reacts with oxygen gas to produce magnesium oxide. If 50.2g of magnesium reacts with 40.8g of oxygen, then;
50.2 + 40.8 = 91 grams of magnesium oxide will be produced.
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Which of the physical states of water contains particles with the highest kinetic energy?A. WaterB. Melting IceC. SteamD. Ice
Option - C : Steam is the physical states of water contains particles with the highest kinetic energy. Because water in a gaseous form, has its particles moving around the most. Therefore, having the highest kinetic energy .
Kinetic energy is the energy that a moving item possesses. An item can only be accelerated through the application of a force. Applying force requires effort on our part. Following completion of the work, energy is transferred to the object, which then moves at a new, constant speed. Kinetic energy is the force that drives motion, and it may be observed in the motion of objects and subatomic particles. Every particle and moving object contains kinetic energy. Walking, a baseball flying through the air, food falling from a table, and a charged particle in an electric field are some examples of kinetic energy in action. The power is the energy , an object in motion possesses.
The word "kinetic" derives from the Greek "kinesis," which means motion.
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Please let me know if you can solve any of these!
Need help!!
A mole ratio is the ratio between the amounts in moles of any two compounds involved in a balanced chemical reaction
What is salt formation equation?
The neutralisation of sodium hydroxide, NaOH, a base, with hydrogen chloride, HCl, an acid, produces sodium chloride, NaCl, and water, H2O: HCl+NaOH → NaCl+H2O.Salt, in chemistry, substance produced by the reaction of an acid with a base. A salt consists of the positive ion (cation) of a base and the negative ion (anion) of an acid. The reaction between an acid and a base is called a neutralization reaction
.
Basic or Alkali Salt – The salt formed by the partial neutralization of a strong base by a weak acid is known as a basic salt. They hydrolyze to form a basic solution. It is because when hydrolysis of basic salt takes place, the conjugate base of the weak acid is formed in the solution.To learn more about salt refers to;
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Click on the Bloomberg Terminal screen to view data in the GLCO function. Which metal had the highest price movement?
O Aluminum
O Nickel
O Iron
O Gold
Gold metal had the highest price movement when viewed in glco function.
During economic recession , investments in gold has increased unexpectedly, which resullted in the highest price movement of gold.
Gold is the most ductile and malleable element on our planet. It is a great metal for jewellery because it never tarnishes.
The color and luster of gold are what make this metal so attractive. Gold is found as the free metal and in tellurides. It is widely distributed and almost always associated with pyrite or quartz.
Gold is a good conductor of electricity and heat. It is not affected by exposure to air or to most reagents. It is inert and a good reflector of infrared radiation. Gold is usually alloyed to increase its strength.
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which of the following volumes is the smallest?
A) one hectoliter
B) one deciliter
C) one milliliter
D) one liter
Answer:
one milliliter
Explanation:
In the metric system, the prefix m stands for “milli”, which means “1/1,000 of”. So 1 ml (milliliter) is only 1/1,000 of 1 l (liter). Therefore, 1 ml is smaller than 1 l.
How many grams of phosphoric acid are formed from 36.4 grams of calcium phosphate?
Answer: Calcium phosphate (Ca3(PO4)2) and phosphoric acid (H3PO4) are two different compounds.
Explanation: In order to determine how many grams of phosphoric acid are formed from 36.4 grams of calcium phosphate, we would need to know the reaction taking place and the stoichiometry of that reaction. Without that information, it is impossible to determine how many grams of phosphoric acid are formed.
Answer:
calcium phosphate (ca3(po4)2) and phosphoric acid(h3po4)
Calcium,+ water yields calcium hydroxide+ hydrogen Complete lonic:Ca+2HeO?Ca ?
The complete ionic and balanced equation of displacement reaction will be - Ca + 2H20 – Ca(OH)2 + H2
In the given equation Calcium and Water yield together to form Calcium Hydroxide and Hydrogen. The reaction which takes place between calcium and water is the example of displacement reaction. In the displacement reaction in the given equation calcium is displaced by hydrogen from the water so to form Calcium Hydroxide.
In a displacement reaction atoms are displaced by another atom in any given molecule. Here the more reactive element displaces the less reactive element. Similar concept is used in the above equation where Calcium takes hydrogen with itself as it is more reactive in nature and forms a new compound of Calcium Hydroxide and Hydrogen releases.
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What mathematical tool do we use to determine the ratio of elements in a compound?
The mathematical tool used to determine the ratio of elements in a compound is called stoichiometry.
Stoichiometry is a tool that uses the balanced chemical equation of the reaction to calculate the ratio of elements in a compound. Stoichiometry is based on the concept of the law of conservation of mass, which states that the total mass of the reactants must equal the total mass of the products. By using the balanced chemical equation, we can calculate the ratio of elements in a compound using a set of mathematical calculations called stoichiometric calculations. These calculations involve using the balanced chemical equation and the molar masses of the elements to determine the number of moles of each element in the compound. This information can then be used to determine the ratio of elements in the compound.
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43. The student hopes the samples are gold, which has a density of 19.3 g/mL. A
local geologist suggest the samples might be pyrite, which is a mineral with a density
of 5.01 g/mL. What is the identity of the unknown sample?
44.Calculate the percent error of each sample. Use the density value given in question
above.
14.3-
TA
45.Was the data collected by the student accurate? Explain your answer.
Therefore, since the density of the samples are closer to the density of pyrite (5.01 g/cm³) we conclude that the samples are more like to be pyrite.
What is pyrite?pyrite, also called iron pyrite or fool’s gold, a naturally occurring iron disulfide mineral. The name comes from the Greek word pyr, “fire,” because pyrite emits sparks when struck by metal. Pyrite is called fool’s gold; to the novice its colour is deceptively similar to that of a gold nugget. Nodules of pyrite have been found in prehistoric burial mounds, which suggests their use as a means of producing fire.Wheel-lock guns, in which a spring-driven serrated wheel rotated against a piece of pyrite, were used before development of the flintlock. Pure pyrite (FeS2) contains 46.67 percent iron and 53.33 percent sulfur by weight. Its crystals display isometric symmetry. For detailed physical properties, see sulfide mineral.To learn more about sulfide mineral refer to:
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Maltose is a disaccharide formed by the formation of _______ bond between glucose and ________.
Maltose is a disaccharide formed by the formation of alpha 1,4glycosidic bond between glucose and alpha D glucose unit
What are Disaccharides?
A disaccharide is a type of carbohydrate that is created by combining two units of glucose. Succrose, maltose, and lactose are the three most prevalent kinds of disaccharide. The other disaccharides are lactulose, trehalose, and cellobiose, which are less well-known. Dehydration reactions are those that occur when one water molecule is eliminated by combining two monosaccharides, resulting in the formation of a molecule of a disaccharide.
The common disaccharides are sucrose, lactose, and maltose. MaltoseTwo alpha D glucose units make up the disaccharide maltose, usually referred to as malt. An alpha 1,4 glycosidic linkage connects the two glucose units. The enzymes maltase and isomaltase break down the molecules of maltose into two glucose molecules in the human small intestine mucosa, which are then absorbed by the body. After cellulose, starch is the carbohydrate that is most prevalent in plant cells.
Formula --C12H22O11
Used extensively in the manufacturing of alcohol.Dental caries can be brought on by free maltose as well as maltose produced in the mouth as a result of starch digestion.The small intestine contains the enzymes maltase and isomaltase, which break down maltose into two glucose units that are then absorbed. Our bodies have the ability to immediately absorb maltose, which can then be broken down into a glucose unit to produce energy.The high glycemic index of maltose causes it to raise blood sugar levels.To know more about Disaccharides,Refer to:
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How many grams of ammonia are produced when 28 grams of nitrogen gas are reacted with excess hydrogen gas?
Answer: 2.0g NH3
Explanation:
First we have to make a balanced equation (should be: N2 + 3H2 -> 2NH3) then we convert the N2 (Nitrogen gas) to moles by finding the molar mass of N2 (28.02g) divide that and multiply by the number of moles of Ammonia (NH3). This would give us 2.0g of NH3. Hope that helps!
If a car can accelerate at 7.5 mi/hr/s, what would be its final speed after 5.0 seconds if its starting speed were 50 mi/hr?
Final speed after 5.0 seconds if its starting speed were 50 mi/hr is 87.5 mi/hr.
What is acceleration?Acceleration is a vector quantity, meaning it has both a magnitude (or size) and a direction. The magnitude of acceleration is measured in units of meters per second squared (m/s²) or feet per second squared (ft/s²). The direction of acceleration is the direction in which the velocity of an object is changing.
There are different types of acceleration:
Positive acceleration refers to an increase in velocity, for example, when an object speeds up.
Negative acceleration or deceleration refers to a decrease in velocity, for example, when an object slows down.
Constant acceleration refers to when the rate of change of velocity is constant, for example, when an object is falling freely under the influence of gravity.
Zero acceleration refers to when an object is moving at a constant velocity, for example, when an object is moving in a straight line at a constant speed.
To calculate the final speed of a car that can accelerate at 7.5 mi/hr/s, we can use the equation:
final speed = initial speed + acceleration x time
In this case, the initial speed is 50 mi/hr, the acceleration is 7.5 mi/hr/s, and the time is 5.0 seconds.
So, the final speed would be:
50 mi/hr + (7.5 mi/hr/s x 5.0 s) = 50 mi/hr + 37.5 mi/hr = 87.5 mi/hr
Therefore, the final speed of the car after 5.0 seconds would be 87.5 mi/hr.
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Gemtone called rubie are made from an aluminium compound with the
formula Al₂O₃. The chemical ymbol for aluminium i Al. Give the name of the element that i combined with aluminium in thi compound
Aluminum oxide has a chemical formula of Al2O3.
A white, odorless powder known as aluminum oxide. Insoluble in water. The preparation process affects the properties (both physical and chemical); various preparation techniques result in various crystalline changes. The variation created at really high temperatures is chemically quite inert. Technical grade alumina is mostly made of alpha-Alumina. Natural aluminum oxide is corundum. Aluminum oxide comes in an impure crystalline version called Emery. (NIOSH, 2022).
an aluminum oxide that can be found in nature as different minerals such as bauxite, corundum, etc. It is employed in the production of dental cement, and refractories, and as a catalyst, desiccating agent, and adsorbent.
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PLEASE HELP AS FAST AS POSSIBLE
Draw a picture of how the chromatography worked. Explain your picture using the following terms: stationary phase,
mobile phase, and intermolecular forces.
Process of separating components of mixture is called chromatography . To get the process started, mixture is dissolved in a substance called mobile phase, which carries it through a second substance which is stationary phase.
What are stationary phase, mobile phase and intermolecular forces?Stationary phase is the phase that doesn't move and the mobile phase is the phase that moves. Mobile phase moves through the stationary phase picking up the compounds that is to be tested.
There are intermolecular forces, such as hydrogen-bonding and dipole-dipole interactions in chromatography, that helps retain the analyte to stationary phase of the column. The stronger is the intermolecular forces, stronger and longer is the compound is retained in column.
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What is the number of nitrogen molecules that reacted with excess hydrogen to make 2 x 10^10 molecules of ammonia?
Stoichiometry and the mole concept state that a reaction between 1 x 1010 molecules and extra hydrogen produced 2 x 1010 molecules of ammonia.
What does stoichiometry mean?A chemical reaction's stoichiometry involves figuring out the ratios of its constituent elements or molecules. The underlying laws of the associated relationships are the law of mass preservation and the law on combining weights & volumes.
To determine the amounts of different compounds contained in the sample, stoichiometry is employed in quantitative analysis.
The balance of chemical equations requires it.
In the example provided, since 1 molecule of nitrogen creates 2 molecules of ammonia, 2 x 1010 molecules o ammonia will be created when 2 x 10101/2=1 molecule.
As a result, 1 x 1010 molecules formed 2 x 1010 molecules of ammonia when they were combined with extra hydrogen.
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Compounds have no charge. True or False
Answer:
False.
Compounds can have a charge. A compound is a substance made up of two or more elements that are chemically bonded together. The charge on a compound depends on the number of electrons in the outermost energy level, or valence electrons, of the atoms that make up the compound. If the compound has an equal number of protons and electrons, it will have no charge, and is called a neutral compound.
However, if there is an unequal number of protons and electrons, the compound will have a charge and is called an ionic compound. For example, the compound sodium chloride, NaCl, is made up of positively charged sodium ions and negatively charged chloride ions, and therefore has an overall charge of neutral.
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