Answer:K2X
Explanation: Valency can be defined as the combining power of an element. It is the valency that dictates the value an element will have when writing a chemical formula for its compound.
MgX is a compound of magnesium and an element X. The valency of magnesium in most of its compound is +2. Now for the 2 to have been absent in the chemical formula, this shows that the element X itself have a valency if -2 for the valencies of both to have canceled out.
Now considering the element potassium, it is an alkaline metal belonging to group 1 of the periodic table. Hence, it is expected that it has a valency of +1
Forming a compound with element X means there would be an exchange of valencies between the two. We have established that x has a valency of -2. The formula of the compound thus formed by exchanging the valencies of both element would be K2X
The chemical formula for the compound formed between Lithium and element X is Li₂X.
What is valency?Valency can be described as the combining power of a chemical element. It is the valency that describes the value an element will have in the chemical formula for that compound.
MgX compound is a compound of magnesium and an element X. The valency of magnesium is +2. The chemical formula shows that the element X itself has a valency of -2 which gave a neutral compound.
Now given element is Lithium, it is an alkali metal of group 1 of the periodic table. It has a valency of +1 as it has one electron in its valence shell.
Forming a compound with element X, there will be an exchange of valencies between the two. As element X has a valency of -2. The formula of the formed compound by exchanging the valencies of Lithium and element X would be Li₂X
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s
Part B
Refer to the observations of the test tubes from part A. Determine which metal (or hydrogen) in each test tube is
more reactive. Remember that the less reactive metal (or hydrogen) will typically end up in pure form as an
element, so no reaction will occur if the less reactive metal (or hydrogen) is the one that begins in pure form
Answer:
More Reactive:
iron
hydrogen
zinc
magnesium
zinc
iron
Explanation:
The reactivity of metals can be determined based on their ability to displace other metals from their compounds or to displace hydrogen from acids. Generally, metals that are higher in the reactivity series can displace metals lower in the series.
1. **Iron & Copper:** Iron is more reactive than copper. If iron is present in its pure form, it would displace copper from its compound.
2. **Copper & Hydrogen:** Hydrogen is less reactive than copper. No reaction will occur if hydrogen is the element in pure form.
3. **Zinc & Iron:** Zinc is more reactive than iron. If zinc is present in its pure form, it would displace iron from its compound.
4. **Iron & Magnesium:** Magnesium is more reactive than iron. If magnesium is present in its pure form, it would displace iron from its compound.
5. **Zinc & Hydrogen:** Hydrogen is less reactive than zinc. No reaction will occur if hydrogen is the element in pure form.
6. **Iron & Hydrogen:** Hydrogen is less reactive than iron. No reaction will occur if hydrogen is the element in pure form.
Remember, the reactivity series is a ranking of metals based on their tendency to lose electrons and form positive ions. Elements higher in the series can displace elements lower in the series from their compounds in certain reactions.
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What is potential energy
A student sets up a titration apparatus with 25 mL of potassium. hydroxide in the flask. In three to five sentences, explain how the student can use a 0.1 M solution of hydrobromic acid to determine the concentration of potassium hydroxide in the reaction.
The concentration of 25 mL of potassium hydroxide can be determined from 0.1 M solution of hydrobromic acid by titration.
Titration involves the process by which the concentration of an unknown solution is determined by reaction a known volume of the unknown solution with a carefully measured volume of a standard solution. By determining the volume of the standard solution required to react completely with the solution of unknown concentration, its concentration can be accurately determined by calculation.
In order to determine the concentration of 25 mL of potassium hydroxide, this volume of solution is put into a conical flask and titrated against a known volume of 0.1 M solution of hydrobromic acid. At the end point, usually signified by a color change, the concentration of the 25 mL of potassium hydroxide solution can be calculated from the stoichiometry of the reaction.
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How many moles of Magnesium(Mg) are
in 2.46 x 10^28 atoms of Magnesium?
so 2.46 X 10^28 contains (2.46 X 10^28)/(6.02 X 10^23) =
(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=
4.09 X 10^4 = 40,900
Answer:
4.09 X 10^4 = 40,900 moles
Explanation:
How many moles of Magnesium(Mg) are
in 2.46 x 10^28 atoms of Magnesium?
PLEASE LEARN THIS FUNDAMENTAL RULE OF CHEMISTRY...1 MOLE OF ANYTHING CONTAINS AVOGADROS NUMBER OF PARTICLES}
6.02 X 10^23.09
so 2.46 X 10^28 contains in moles(2.46 X 10^28)/(6.02 X 10^23) =
(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=
4.09 X 10^4 = 40,900 moles
High tides are located at__
A an B
B an D
B an C
Answer:
b and c since they bulge
Explanation:
What are the two parts of the third Step?
O Plug and solve
O Formula and solve
O Show work and solve
O Question and show work
Answer:
A
Explanation:
Answer:
I'm not quite sure what the question is. What is the third step? I think I can help, would you mind commenting what the third step is? :)
Explanation:
How many mm Hg are there in 2.27 atm?
Answer:
[tex]\huge\boxed{\sf 2.27\ atm = 1,725\ mm\ of\ Hg}[/tex]
Explanation:
We know that:
1 atm = 760 mm of Hg (Standardly)
Multiply both sides by 2.27
2.27 atm = 760 * 2.27 mm of Hg
2.27 atm = 1,725 mm of Hg
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH180760) Which of the following is a chemical property?
A) Sugar is a solid at room temperature.
B) Potassium reacts with water to form potassium hydroxide.
C) Sugar dissolves in water.
D) Gasoline and water do not mix.
.
Answer:
C is the answer. Sugar Dissolves in water
Explanation:
Brainliest Maybe
Sugar dissolves in water is a chemical property. Therefore, option C is correct.
What do you mean by chemical properties ?Chemical properties describe a substance's characteristic ability to react to form new substances; they include flammability and corrosion susceptibility. A pure substance's chemical and physical properties are the same in all samples.
A chemical property is the ability or inability to change one type of matter into another. Chemical properties include flammability, toxicity, acidity, reactivity, and heat of combustion.
A chemical property explain the ability of a substance to undergo a specific chemical change. To verify a chemical property, we look for a chemical change.
Thus, Sugar dissolves in water is a chemical property, option C is correct.
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How many moles are present in a sample of HCI with a mass of with a mass of 3.65g?
Answer:
number of moles = 0.1001 mol
Explanation:
number of moles = mass/molar mass
number of moles = 3.65g / 36.459 g/mol
n = 0.1001 mol
How many grams of pure aluminum could be produced from 999 g of aluminum oxide?
Answer:
Explanation:
First, calculate the molar mass of Aluminum Oxide (Al2O3), by multiplying the number of the constituent atoms, by their relative atomic abundances . Inserting the atomic masses into the equation gives you . Then find the percent of Aluminum by mass, in Aluminum Oxide. Finally, set up an equality, where 53.02% of the mass of Aluminum Oxide, is 999 grams of Aluminum
PLEASE HELP!!!!! WILL GIVE BRAINLIEST!!!!
The answer should be A
VisibleVisible wave length visible wavelength of light that are emitted by Adams can be used to get Nate explosive devices remotely
what element has a high content of brilliant yellows color
Answer: , sulfur and gold are most obviously yellow.
Explanation: Phosphorus, arsenic and antimony have allotropes which are yellow or whitish-yellow; fluorine and chlorine are pale yellowish gases.
Butanoic acid + 2 propanol
Answer:
Butanoic acid and 2-propanol reacts to form isopropyl butyrate.
Explanation:
brainliest plz
Using the provided table and the equation below, determine the heat of formation (in kJ/mol) for CuBr₂.
CuCl₂ (s) + Br₂(l) → CuBr₂ (s) + Cl₂ (g) ∆H° = 64.1 kJ/mol
CuCl2= -205.9 kJ/mol
Br2= 0 kJ/mol
Cl2= 0 kJ/mol
The heat of formation of CuBr₂ (s) = -141.8 kJ/mol
The heat of reaction ΔH = ∑ΔHproducts - ∑ΔHreactants
ΔH = ΔHCuBr₂ (s) + ΔHCl₂ (g) - [ΔHCuCl₂ (s) + ΔHBr₂(l)]
where ΔHCuBr₂ (s) = heat of formation of CuBr₂ (s), ΔHCl₂ (g) = heat of formation of Cl₂ (g) = 0 kJ/mol, ΔHCuCl₂ (s) = heat of formation of CuCl₂ (s) = -205.9 kJ/mol, ΔHBr₂(l) = heat of formation of Br₂(l) = 0 kJ/mol and ΔH = heat of reaction = 64.1 kJ/mol
Substituting the values of the variables into the equation, we have
ΔH = ΔHCuBr₂ (s) + ΔHCl₂ (g) - [ΔHCuCl₂ (s) + ΔHBr₂(l)]
64.1 kJ/mol = ΔHCuBr₂ (s) + 0 kJ/mol - [-205.9 kJ/mol + 0 kJ/mol]
64.1 kJ/mol = ΔHCuBr₂ (s) + 0 kJ/mol + 205.9 kJ/mol - 0 kJ/mol
64.1 kJ/mol = ΔHCuBr₂ (s) + 205.9 kJ/mol
ΔHCuBr₂ (s) = 64.1 kJ/mol - 205.9 kJ/mol
ΔHCuBr₂ (s) = -141.8 kJ/mol
So, the heat of formation of CuBr₂ (s) = -141.8 kJ/mol
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.. How many seconds will it take for a satellite to travel 650 km at a rate of 220 m/s?
Answer: 3750s Happy To Help
Explanation:
Multiple Choice Question
What do molecules in a bowl of hot soup do?
A. Disperse
B. Evaporate
C. Vibrate
D. Sublimate
Submit
Answer:
Explanation:
i would say not d im not fully sure but id say c
When molecules present in a bowl of hot soup then they do vibration due to high kinetic energy.
What are molecules?Molecules are the example of chain substance, which can be prepared by the addition of two or more than 2 atoms of same or different nature.
In a hot soup bowl, kinetic energy of the molecules present in that soup increases due to which they move with higher velocity and also shows vibration in their mean position.
Hence, option (C) is correct i.e. vibrate.
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15.3 Determine the mass of the following: 15.3.1. 2 mol calcium atoms
15.3.2. 0,3 mol nitrogen molecules
15.3.3. 0,5 mol table salt
15.3.4. 0,2 mol hydrochloric acid
15.3.5. 0,08 mol sodium carbonate (Na2CO3)
15.3.6. 0,25 mol ammonium sulphate (NH4)2SO4
Answer:
htyiu
Explanation:
What scientific term is a well-tested explanation for a set of observations or experimental results?
law
theory
method
conclusion
Answer:
b) theory
Explanation:
Answer:
theory or, conclusion is the answer
Please answer question (e)
Answer:
I don't know sorry am read in 5 class
Describe the structure and bonding in aluminium metal.
Answer: Metallic bonding.
Explanation: Aluminum forms metallic bonds with itself. This results in a metallic lattice structure.
Aluminum is found in the 13 group of periodic table and it mostly forms ionic bonds with metal. The structure of Aluminum is Orthorhombic mainly.
What is element?
Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
The structure of Aluminum is Orthorhombic and it contains high neutron capture cross section. It is very stable in dry air but oxidizes in moist air. It reacts with oxygen to form Al₂O₃.Valence of Aluminum is III. Its electronic configuration is [Ar]3d¹⁰ 4s² 4p¹
Thus structure of Aluminum is Orthorhombic and metallic bond is formed by Aluminum
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write the electronic configuration of iron in fecl2 and fecl3
Ferrus is a transition metal.
FeCl_2
Valency of Fe is 2 .Hence Z=26-2=24Electronic configuration is given by
[tex]\\ \sf\longmapsto [Fe]^{2+}=1s^22s^22p^63s^23p^64s^23d^4[/tex]
FeCl_3
Valency of Fe is 3Hence Z=26-3=23Electronic configuration is given by
[tex]\\ \sf\longmapsto [Fe]^{3+}=1s^22s^22p^63s^23p^64s^23d^3[/tex]
2.When copper (II) nitrate reacts with sodium hydroxide, copper (11) hydroxide is produced.
How many grams of copper (11) hydroxide can be prepared from 2.7 g of copper (II) nitrate
reacting with sodium hydroxide?
Answer:
2Cu + S ~~~> Cu2S Copper (C) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction.
Explanation:
what is the product of the following reaction? Cd+Znso
A. Zn+CdSO4
B. H2+CdSO4
C. H2+ZnSO4
D. H2+Zn
E. No reaction
Answer:
Cd + ZnSO4 -----> Zn + CdSO4
Explanation:
:)
Define physical and chemical properties, provide three examples of each, discuss their reversibility, and
explain the fundamental differences between them.
When ice turns into a liquid, this is a __1__ change because __2__.
Answer:
1.physical change because the ice from a solidform cahnged into a liquid form
Guy’s pleaseeee help
Answer:
A. All isotopes have no charge
Are the atoms really "sharing" electrons? Explain.
Answer:
yes, in certain cases
there are different types of bondings between atoms
and in some they lend electrons to make their atom stable this type of bonding is called ionic bonding
and in covalent bond the atoms share their electrons
When the Northern Hemisphere is tilted ________the Sun, the sunlight is _________ direct than it is in the Southern Hemisphere. (Select all that apply.)
away from; less
toward; more
toward; less
away from; more
toward, more
away from, less
Explanation:
When the northern hemisphere is tilted toward the sun, the sunlight is more direct than it is in the southern hemisphere. This explains why it's wintertime in Australia while at the same time, it's summertime in the US.
When the northern hemisphere is tilted away from the sun, the sunlight is less direct than it is in the southern hemisphere. This explains why it's summertime in Australia while it's wintertime in the US.
The flask contains 25 mL of an unknown diprotic acid aqueous solution that reacts in a 1:2 stochiometric ratio with NaOH. Titrate the solution with NaOH to determine the concentration of the acid. Perform a titration by setting the concentration of the NaOH solution and adding it to the acid solution using the different Add Base buttons. The equilvalence point of the titration is passed when the indicator color changes. The unknown sample can be titrated multiple times by pressing the Retitrate button and starting over. Enter the concentration of the unknown acid solution.
To obtain accurate results, follow the following procedure:
switch the indicator to phenolphthalein titrate 1 mL at a time until solution turns pink, make note of volume added retitrate add 1 mL at a time until 1 mL less than the first titration add 0.05 mL at a time until the solution just turns pink
Answer:
The flask contains 25 mL of an unknown diprotic acid aqueous solution that reacts in a 1:2 stochiometric ratio with NaOH. Titrate the solution with NaOH to determine the concentration of the acid. Perform a titration by setting the concentration of the NaOH solution and adding it to the acid solution using the different Add Base buttons. The equilvalence point of the titration is passed when the indicator color changes. The unknown sample can be titrated multiple times by pressing the Retitrate button and starting over. Enter the concentration of the unknown acid solution.
Explanation:
The Lewis electron-dot structure of oxygen has how many dots?
Answer:
Oxygen has 6 valence electrons and follows the octet rule.
If you were drawing a lewis structure for O2, there would be a total of 12 valence electrons (6 x 2 = 12).
The completed structure would have a double bond between the two oxygen atoms with 2 lone pairs per oxygen, giving you a total of 8 electrons that are lone pairs (or dots).
