In order to precipitate the calcium ions as calcium oxalate, a 2.00g sample of limestone was first dissolved in hydrochloric acid until all of the calcium was transformed to Ca²⁺ (aq). This was followed by the addition of excess ammonium oxalate solution, (NH₄)₂C₂O₄(aq). Filtered, dried, and weighed to a consistent mass of 2.43g. The percentage by mass of calcium in the limestone sample is 31.25%
The percentage by mass of calcium in the limestone can be calculate as follows:
Mass of precipitate that is calcium oxalate = 2.43 g
Moles of calcium oxalate = 2.00g /128 g/mol = 0.015625 moles
One mole of calcium atoms make up one mole of calcium oxalate.
so, 0.015625 moles calcium oxalate equal to 0.015625 moles calcium atoms
Mass of 0.015625 moles of calcium :
0.015625 mol × 40 g/mol = 0.625 g
Mass of sample of limestone = 2 g
Percentage of calcium in limestone:
(0.625 g/2 g) x 100 = 31.25%
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Look at the equation.
C₂H4 +302 2CO₂ + 2H₂O
If the reaction shown has 55.0 grams of ethylene (C₂H4) and excess oxygen (30₂), how many moles of carbon dioxide will be
produced?
The number of moles of the carbon dioxide is 3.92 moles.
What is the number of moles?We know that the number of the moles can be obtained by the use of the equation of the reaction that has been shown in the question as; C₂H4 +302 -------> 2CO₂ + 2H₂O.
We then have that;
Number of moles of the ethylene = 55.0 grams/28 g/mol
= 1.96 moles
If 1 mole of ethylene produces 2 moles of carbon dioxide
1.96 moles of ethylene would produce x moles of carbon dioxide
x = 1.96 * 2/1 mole
= 3.92 moles
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what are the correct coefficients if the law of conservation of mass is applied to the decomposition of solid ammonium nitrite to nitrogen gas and liquid water?
The correct equations for the breakdown of solid ammonium nitrite to nitrogen gas and liquid water under the law of conservation of mass would be 1 mol of solid ammonium nitrite to 1 mol of nitrogen gas and 1 mol of liquid water.
Since matter cannot be generated or destroyed, according to the rule of conservation of mass, the total mass of the reactants and products in a chemical process must remain constant. The balanced chemical equation for the breakdown of solid ammonium nitrite is:
NH4NO2(s) N2(g) + H2O (l)
The coefficients in this equation stand for the ratio of moles of each reactant and product. According to the factors 1, 1, and 1, 1 mol of nitrogen gas and 1 mol of liquid water are created for every 1 mol of solid ammonium nitrite that is broken down. As required by the rule of conservation of mass, this indicates that the combined mass of the reactants and products remains constant.
Ammonium nitrite ,[tex]$\mathrm{NH} 4 \mathrm{NO}$[/tex], will decompose to yield nitrogen gas and water Vapor by the following equation:
[tex]\mathrm{NH}_4 \mathrm{NO}_2(s) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(\mathrm{g})+\mathrm{N}_2(g)[/tex]
What is a decomposition reaction?
A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
Ammonium nitrite, [tex]$\mathrm{NH} 4 \mathrm{NO} 2$[/tex], will decompose to yield nitrogen gas and water Vapor by the following equation:
[tex]\mathrm{NH}_4 \mathrm{NO}_2(s) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(g)+\mathrm{N}_2(g)$$[/tex]
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The characteristics of two different types of reactions are shown below: Reaction A: Electrons are gained by the atoms of an element. Reaction B: Protons are lost by the atom of an element. Which statement is true about the atoms of the elements that participate in the two reactions? a Their identity changes in both Reaction A and Reaction B. b Their identity changes in Reaction A but not in Reaction B. c Their identity changes in Reaction B but not in Reaction A. d Their identity remains the same in both Reaction A and Reaction B.
Answer:
C: B's identity changes, but not A's identity. The identity of an element is solely dependent on the number of protons. For example, 2 protons in an element would be Helium. But if you add or subtract protons you would get a different element like Hydrogen or Lithium. However, such a rule does not apply to electrons; adding or removing electrons would just change the charge of the element, but not the identity.
c is the correct choice
The periodic properties of elements are directly related to the A: group position, B: effective nuclear charge , C: energy levels ,D: Atomic Finite boundaries. ,choose the correct answer
The periodic properties of elements are directly related to the energy levels of the atoms of the elements.
The correct option is C.
What are the periodicity elements in the periodic table?The periodicity of elements in the periodic table is the regular variation of the properties of the elements in the periodic table both down the group and across the periodic.
The properties of elements that show periodicity include;
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color of the solution in the control changed? 4) infer. when you began the experiment, was there co2 in the water? in the test tubes that contained elodea, where did the co2 go?
The water was, indeed, green. This signifies a low carbon dioxide level. Carbon dioxide was utilized in the photosynthesis activity in the tubes containing Elodea.
Carbon dioxide is a compound consisting of molecules that are covalently double bonded to two oxygen atoms. At ambient temperature, it appears to exist as just a gas. Carbon dioxide in the atmosphere is translucent to visible to the human eye but soaks up infrared light, acting as a greenhouse gas. Photosynthesis is the process that plants as well as other microbes use to convert chemical energy into light that can then be released to power the individual's activities via cellular respiration.
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what is the nuclear binding energy per mole if the mass defect of a certain isotope is 0.1172 u per atom or 0.1172 g per mol? express your answer in joules. remember to use self-consistent units.
4.447 x10^13 J is the nuclear binding energy per mole if the mass defect of a certain isotope is 0.1172 u per atom or 0.1172 g per mol? express your answer in joules.
BE = dleta mc^2.
Given that, delta m = mass defect = 0.4941 g per mol = 0.4941/1000 kg/mol c = 3x10^8 m/s
BE = ( 0.4941/1000) x (3x10^8)^2= 4.4469 x10^13
= 4.447 x10^13 J
Nuclear binding energy is energy required to completely separate an atomic nucleus in with its constituting protons and neutrons, or the energy freed by combining protons and neutrons into a single nucleus. Isotopes are atoms that have the same number of protons but number of protons. They have nearly identical chemical composition but differ in volume and thus in physicochemical parameters.
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Predict the products and balance the equation.
NaCl (aq) + KNO₂ (aq) →
Sodium chloride is produced and used in the production of polyester, paper, rubber, glass, chlorine, household bleach, soaps, detergents, and dyes.
Is salt the same as sodium chloride?Chemically speaking, salt is a combination of chloride and sodium. Actually, the element that is most harmful to your health is sodium. (Therefore, the chloride is what gives food its "salty" flavor.).
Why do doctors administer sodium chloride to patients?To replace salt and water that have been lost from your body as a result of specific conditions, sodium chloride 23.4% injection is employed (eg, hyponatremia or low salt syndrome). Additionally, it is added to IV fluids that contain carbohydrates and parenteral nutrition total (TPN).
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How can we increase a pulley's output force?
Answer:
Two ways is by reducing the mass of the pulley we can increase its efficiency and by applying more force than usual
Explanation:
if we use a to represent the cations (in blue) and x to represent the anions (in green), what is the empirical formula of this ionic compound?
The empirical formula for the compound if A denotes the cations and X denotes the anions is AX₂
It is given that the cations are denoted by Blue color and the anions with green color. There are 8 atoms in the corners and 6 in the face center. Then,
No of atoms in a total of all corners = 8 x 1/8
No of atoms in the corners = 1
No of atoms in the faces = 6 x 1/2
No of atoms in the faces = 3
Then,
Total no of cations atoms = total number of atoms in the corners + the total number of atoms in the faces
Total number of cations (A) = 1 + 3
Total number of cations (A) = 4
The total number of anions in the cell is 8 from the figures as they aren't shared with another lattice arrangement. Therefore,
Number of anions (X) = 8
Then the empirical formula would be A₄X₈ which could be written in the simplified form of AX₂.
Thus, the empirical formula is AX₂ for the arrangement.
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how to balance: CaCl2(aq) + Na3PO4(aq) ⟶ Ca3(PO4)2(s) + NaCl(aq)
can someone explain how to do it? thanks
The given double displacement reaction can be balanced as written below:
[tex]\rm 3CaCl_{2} + 2Na_{3}PO_{4} \rightarrow Ca_{3}PO_{4} + 6 NaCl \\[/tex]
What is displacement reaction?Displacement reactions are those in which one or two groups are replaced to form the new products. There are both single displacement reaction and double double displacement reactions.
In single displacement reactions, only one reactant will be replaced in the reaction whereas in double displacement reactions, two groups from the reactants are exchanged each other.
In the given reaction, the phosphate group is replaced to Ca and the Cl is group is shifted to Na metal as written in the chemical equation.
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is a chemist has 1.87 moles of na2o and causes it to decompose into its constitiuent elemtns how many moles of na will form
3.74 moles of Na will be produced after the decomposition of Na₂O.
The decomposition reaction of Na2 is as follows:
2Na₂o → 4Na + o₂
Given, moles of Na₂o = 1.87
From stoichiometric coefficient 2 in Na₂o, after decomposition we get coefficient as 4 of Na. That means the yield of Na is double the reactant.
Hence, the moles of Na after decomposition= 2 x 1.87 = 3.74 moles
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HI(aq)+Rb2S(aq)→ What is the answer to this please
The given equation is a double displacement reaction. It can be balanced as follows:
[tex]\rm 2HI + Rb_{2}S \rightarrow H_{2}S + RbI_{2}[/tex]
What is displacement reaction?Displacement reaction is a type of reaction in which one or two group from the reactants displaces by other groups. There are both single displacement and double displacement.
In single displacement reaction, only one group is displaced. Whereas, in double displacement reactions, two groups are displaced each other between reactants.
In the given reaction, the iodine atom and sulphide group are displacing as written in the equation.
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An apple costs $0.63. One tree produces 418 apples. The orchard has 20 trees. The apple farmer wants to trade the orange farmer 3 oranges for every 2 apples. How many oranges is he able to obtain by trading 0.64 of his orchard?
The apple farmer is able to obtain 8,034.6 oranges by trading 0.64 of his orchard.
How to determine how many oranges he is able to obtain by trading 0.64 of his orchard?
A word problem is a mathematical exercise where significant background information on the problem is presented in ordinary language rather than in mathematical notation
First, let's find the total number of apples produced by the orchard:
20 trees × 418 apples/tree = 8,360 apples
Now, let's find the number of apples that the apple farmer is able to trade: 8,360 apples × 0.64 = 5,350.4 apples
Since the apple farmer wants to trade 3 oranges for every 2 apples, he will be able to obtain:
3 oranges / 2 apples × 5,350.4 apples = 8,025.6 oranges.
Therefore, the apple farmer is able to obtain 8,025.6 oranges by trading 0.64 of his orchard.
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nickel has a face-centered cubic (fcc) structure and has a density of 8.90 g/cm3. what is its atomic radius?
The nickel has a face-centered cubic (fcc) structure and has a density of 8.90 g/cm3. its atomic radius is 1.36 × 10⁻⁸ cm.
given that :
density = 8.90 g/ cm³
the density is given as :
density = mass / volume
no. of atoms = 8 (1/8) + 6(1/2)
volume = (r × 8 (1/8))³
mass = 4 atoms × mol / 6.022 × 10²³ atoms × 58.68 g /mol
density = mass / volume
8.90 g/ cm³ = (4 atoms × mol / 6.022 × 10²³ atoms × 58.68 g /mol ) / (r × 8 (1/8))³
r = 1.36 × 10⁻⁸ cm
Thus, the atomic radius is 1.36 × 10⁻⁸ cm.
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Plastic beads used in jewelry making are made of long molecules usually consisting of carbon, hydrogen, and oxygen. Compare the bonding in these molecules to the bonding in gems.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, gems have ionic bonding and plastic beads have covalent bonding.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Gems have ionic bonds formed between metals and nonmetals. Plastic beads, will have covalent bonds because it is easily deformed.
Therefore, gems have ionic bonding and plastic beads have covalent bonding.
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333
Identifying States of Matter
Use the drop-down menus to complete the statements.
✓have a definite shape and volume.
do not have a definite volume or shape.
have a definite volume, but the shape may change.
States of matter:
Solids: have a definite shape and volume.
Gases: do not have a definite volume or shape.
Liquids: have a definite volume, but the shape may change.
What is states of matter?
States of matter refer to the physical behavior of matter based on its temperature and pressure. There are three main states of matter: solid, liquid, and gas.
There are also several other states of matter, such as plasma and Bose-Einstein condensate, that are observed under certain conditions, such as extremely high temperatures or pressures.
According to the problem:
Solids are characterized by their ability to maintain a fixed shape and volume. They are typically solid at room temperature and have a high degree of structural rigidity.
Gases, on the other hand, do not have a definite shape or volume. They are characterized by their ability to expand and fill any container they are placed in. Gases are typically in a gaseous state at room temperature and are highly compressible.
Liquids are intermediate between solids and gases. They have a definite volume, but the shape may change to conform to the shape of their container. Liquids are typically liquid at room temperature and are less compressible than gases, but more compressible than solids.
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the s^2+ ion differs from the S atom in S^2+ that ion has a
Answer:
Explanation: The S^2+ ion would contain a smaller atomic radius when compared to the atomic radius of S. With the removal of electrons, the outermost electrons experience less shielding, and thus experience a greater columbic force, and effective nuclear charge. Pulling in the outside electrons closer to the nucleus, consequently shrinking the atomic radius.
Choose the exothermic reaction that is used to ignite the Mg + Oxygen reaction (step 2) that eventually lights the thermite.
2 H2 + O2 ----> 2 H2O
2 Na + O2 ----> Na2O
CH4 + 2 O2 ----> 2 H2O + CO2
2 C4H10 + 13 O2 ----> 8 CO2 + 5 H2O
The reaction that can light the thermite is the combination of methane and oxygen. Option C
What is an ignition reaction?There is an ignition reaction when we burn a substance in another substance. Now, we know that an exothermic reaction refers to the kind of reaction hat is able to produce heat.
Since the exothermic reaction can be able to produce heat, this is the reaction that we can use to light the reaction between the magnesium and the oxygen so that we can be able to light the thermite.
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an atom with an imbalance of electrons to protons is a. a hadron. b. a baryon. c. an ion. d. an isotope. e. none of these
An ion is an atom with an unbalanced ratio of protons to electrons. Atoms or molecules having associated net charges greater than zero are referred to as "ions."
a charged molecule or atom is referred to as an ion. It charges up or down depending on whether one or more electrons are gained or lost. Because of this, it can have a positive or negative charge. Consequently, an ion becomes charged when there is an imbalance between the proportion of positively charged protons to negatively charged electrons. Ions can be categorised into one of two major types. Cations and anions are what they are.A superscript with a plus sign and the number before the plus sign is applied to the chemical formula to represent the symbol for a cation.Anions are represented similarly to cations by the charge number followed by a negative sign.Another subatomic particle with a positive electrical charge is the proton. They are present in the atom's nucleus.
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calculate the volume in liters of a mm silver(ii) oxide solution that contains of silver(ii) oxide . round your answer to significant digits.
The volume of the solution is 1.84 × [tex]10^{4}[/tex] L.
The formula used to get the molarity of the solution is used to determine the volume of the solution:
Molarity= [tex]\frac{Mass of the solute}{molar mass of solute * Volume of solution(in L)}[/tex]
We are given:
Molarity of solution = 8.75 × [tex]10^{-5}[/tex] M
Given the mass of silver (II) oxide = 200 g
Molar mass of silver (II) oxide = 124 g/mol
Put the values in the formula:
8.75 × [tex]10^{-5}[/tex][tex]10^{-5}[/tex] = [tex]\frac{200}{124* Volume}[/tex]
Volume= 1.84 × [tex]10^{4}[/tex] M
A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The most used molarity unit in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units.
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what should be added to a separatory funnel in order to partition an acidic organic compound into the aqueous layer? group of answer choices
NaCl or NH4Cl should be added to a separatory funnel in order to partition an acidic organic compound into aqeous layer.
What is aqeous layer?If it is difficult to tracking where the water droplets go, also keeping track of the volumes of the layers: whichever layer increased with the additional of water is the aqeous layer.
The aqeous phases is water-based and can be an acidic, basic, neutral, or a saturated salt solutions. The organic phase is an organics solvent, usually diethyl ether or dichlorophenoline, which has minimalist solubility in water. For instance, ethanol would be a poor extractions solvent because it forms a solution within water.
One methods is to add NaCl or NH4Cl should to the separatory funnels, which dissolved in the aqueous layer and Decreased the ability of organics compounds to dissolve in water ("salting out").
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according to the building-up principle or aufbau principle, which subshell is typically filled next after the 6s subshell?
Aufbau's principle states that an electron in an atom is filled according to the energy of orbitals, orbital with minimum energy is first filled, and so on.
so the order of filling of electrons in orbitals are 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p 8s.
so, the 4f subshell is filled after the complete filling of electrons in 6s.
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What is the correct molecular formula for the compound magnesium chromate pentahydrate?
MgCrO4•5H2O is the answer
The correct molecular formula for the compound magnesium chromate pentahydrate is as follows: MgCrO₄•5H₂O.
What is molecular formula?Molecular formula in chemistry is a notation indicating the number of atoms of each element present in a compound.
Chemical or molecular formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs.
The chemical formula also reveals information about the types and number of atoms that make up a chemical compound or molecule.
For example; a chemical compound named magnesium chromate pentahydrate will have a chemical formula of MgCrO₄•5H₂O.
This tells us that the compound contains magnesium, chromium, oxygen, and hydrogen atoms.
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when 2.16g of h2 reacts with excess o2 by the following equation, 258kj of heat are released. what is the change of enthalpy associated with the reaction of 1.00mol of hydrogen gas?
when 2.16g of h2 reacts with excess o2 by the following equation, 258kj of heat are released. the change of enthalpy associated with the reaction of 1.00mol of hydrogen gas is -241 KJ
Molar mass of H2 = 2.016 g/mol,mass(H2)= 2.16 g
use:number of mol of H2,n = mass of H2/molar mass of H2=(2.16 g)/(2.016 g/mol) = 1.071 mol
For 1.071 mol of H2, heat released = 258 KJ So,
for 1 mol, heat released = 258/1.071 KJ = 241 KJ
Since this is heat released, sign will be negative
Answer: -241 KJ. The amount of energy progressed or subsumed in a reaction at constant pressure is referred to as enthalpy change. It is represented by the symbol ΔH, read as "delta H". It should be noted that the term "enthalpy change" only pertains to reactions performed at constant pressure. As a result, if a reaction emits more electricity than it absorbs, the reaction is exothermic, and the enthalpy is negative. Consider this as a quantity of heat departing (or being deducted from) the reaction.
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How specifically is kinetic energy lost during a car crash?
Answer + Explanation:
During a car crash, kinetic energy is lost through various forms of deformation of the vehicle and the generation of heat.
When a car collides with another object, the force of the impact causes the vehicle's body and structure to deform. This deformation absorbs some of the kinetic energy and converts it into other forms of energy, such as heat and sound.
In addition, friction between the moving parts of the car and between the car and the road can also generate heat, which absorbs some of the kinetic energy.
The amount of kinetic energy lost during a car crash depends on the mass of the vehicle, the speed at which it was traveling, and the type and severity of the collision. In general, higher speeds and more severe collisions result in greater kinetic energy loss.
Rannan wants to perform a scientific experiment. He writes out a systematic process that involves him making observations and then forming his opinion about those observations. He then collects his opinions together and uses them to show that his findings are supported by evidence.
He shouldn't present his opinions as evidence.
What is the definition of a hypothesis?
A hypothesis is a tested assertion regarding the relationship between two or more variables or a theory put up to explain an observed occurrence in a scientific setting.
The complete population should be examined in order to ascertain whether a statistical hypothesis is accurate. As it is frequently impractical, researchers usually look at a random sample of the population. The statistical hypothesis is rejected if the sample data do not support it.
Making an experiment is the most typical method of testing a theory. A good experiment employs test subjects or establishes situations where you may determine whether your hypothesis appears to be true by assessing a wide array of of data (test results).
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which halogen forms the weakest bond to carbon? rev: 12 08 2020 qc cs-243801 multiple choice f cl br i
The halogen forms the weakest bond to carbon is Iodine due to vary size difference between iodine and a carbon
Iodine is a chemical element with the symbol I and atomic number 53. It is a halogen, which means it is a highly reactive, nonmetal element that occurs in the periodic table among the highly reactive nonmetals. Iodine is a blue-black, lustrous solid that sublimates (turns from a solid directly into a gas) at standard temperature and pressure. It has a melting point of 386.85 degrees Fahrenheit (193.65 degrees Celsius) and a boiling point of 575.1 degrees Fahrenheit (302.9 degrees Celsius). Iodine is an essential trace element in the human body. It plays a vital role in the production of thyroid hormones, which are important for normal growth and development. The thyroid gland, located in the neck, absorbs iodine from the blood and uses it to produce thyroid hormones. Iodine deficiency can lead to goiter, a condition characterized by an enlarged thyroid gland.
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when aqueous solutions of iron(iii) sulfate and potassium phosphate are combined, solid iron(iii) phosphate and a solution of potassium sulfate are formed. the net ionic equation for this reaction is:
The solubility laws that regulate ionic chemicals in an aqueous solution are the main focus of double replacement reactions. The insoluble iron(III) phosphate, FePO4, precipitates out of the solution when these two solutions are combined because the iron(III) cations and phosphate anions combine to make it.
FeBr3(aq)+K3PO4(aq)→FePO4(s)⏐↓+3KBr(aq)
Ionic equations are chemical formulas in which the electrolytes in aqueous solution are stated as dissociated ions, in contrast to molecular equations, which express compounds as molecules. The ionic species are typically followed by (aq) in the equation to denote that they are in an aqueous solution, and the substance in question is typically a salt that has been dissolved in water.
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F. According to the rules for naming compounds that you learned in this course, what is the
chemical name of this new product? What is its common name? (2 points)
Molecular compounds are termed by using the stem of the first element's name plus the suffix -ide, followed by the second element. Numerical prefixes are used to specify the number of atoms in a molecule.
What does "chemical common name" mean?The IUPAC defines a common name as one that clearly identifies a chemical but does not adhere to the current systematic naming convention. Acetone, which bears the scientific term, serves as an illustration of a common name. 2-propanone
What is the short answer to chemical?A chemical is any substance whose composition is known. A chemical always consists of the same "substance," to put it another way. Water is one of the substances found in nature.
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classify each of the following characteristics as related to fusion, fission, or both
Used in nuclear
power plants
Byproducts have
long half-lives
Needs very high
temperatures
Releases lots
of energy
Occurs on the sun
Fission only
Fusion only
Fission and fusion
Nuclear Fission include used in nuclear power plants and byproducts have long half-lives, Nuclear fusion includes occurs on the sun and needs very high temperatures, while Nuclear fission and Nuclear fusion includes release lots of energy.
What are Nuclear fission nuclear and Nuclear fusion?Nuclear fission is a physico chemical process caused when an atom divides into two smaller atoms, which released important amounts of energy and it is used to generate electricity in nuclear power plants.
Conversely, Nuclear fusion occurs when smaller atoms such as hydrogen fuse to form larger atoms, which is able to generate much more energy when compares to Nuclear fusion, and this process fuel energy in the sun.
Therefore, with this data, we can see that fission nuclear and fusion nuclear are very different processes in terms of the division of fusion of atoms and they release differential amounts of energy.
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