assuming you start with 1.25 g of pure aluminum, calculate the following: 1) the amount of potassium hydroxide, k o h , in grams, needed to react with all of the 1.25 g of a l . the reaction is:
The amount of mass potassium hydroxide (KOH) required to react with every 1.25 g of aluminum is 2.58 g.
The amount of mass potassium hydroxide (KOH) required can be calculate as follow:
as we know;
Mass of pure aluminum = 1.25g
Molar mass of KOH = 56 g/mol
The chemical reaction of a given element is given by:
[tex]2Al + 2 KOH + 6H_2O = > 2K^{+} +2Al(OH)^{4-} +3 H^{+}[/tex]
From the above reaction, we can deduce that:
2 mol AL ----- 2 mol KOH
How many moles of aluminum are needed for 1.25g?
[tex]n Al =\frac{ g}{mw} \\n Al =\frac{ 1.25}{27}\\nAl = 0.046 moles[/tex]
The mass of KOH required for 0.046 moles of aluminum is calculated as:
Mass Required = 0.046 x 56
Required mass = 2.58 g
Therefore, the amount of mass potassium hydroxide (KOH) required to react with every 1.25 g of aluminum is 2.58 g.
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How many moles of neon gas will occupy a volume
of 875 mL at 3.25 atm and 25°C?
The molarity of the solution is 2.33 mol /L
molarity is a physical quantity that describes the substance's number of moles available in the unit liter volume of the solution. A mole per liter is a measurable unit to explain molarity.
Number of moles of the NaCl is
np = 3.50 mol
The volume of the solution is np = 1.50 L
The expression for the molarity solution is cm = np/vp
At the value and get the above expression
Cm = 3.50/ 1.50
= 2.33 mol /L
Thus the molarity of the solution is 2.33 mol /L
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What is the name for N2P3?
a) Triphosphorus Dinitride
b) Dinitrogen Triphosphide
c) Nitrogen Monophosphide
d) Nitrogen Phosphide
Answer:
Dinitrogen trioxide (triphosphide)
Explanation:
What intermolecular force is present for Ne to form a liquid at low temperatures?
a) London Dispersion Forces
b) Hydrogen bonding
c) Dipole - Dipole forces
d) Ionic bonds
Intermolecular force is present for Ne to form a liquid at low temperatures is London dispersion forces.
The hydrogen bond is present between the Hydrogen atom to the N, O, F. The dipole - dipole interaction forces are present in between two polar molecules. ionic bonds exists between two ions, that are positively charged . one is positively charged another one is negatively charged. neon exist as diatomic gas. so, the neon is a non polar .S, neon diatomic atom is present without forming any chemical bond with another atom. so., from the given option in the ques it is clear that the force between the neon atom is present as London dispersion force.
Thus, Intermolecular force is present for Ne to form a liquid at low temperatures isa) London dispersion forces.
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Based on the model, can hydrogen be used to make oxygen? and how do you know?
Answer:
can hydrogen be used to make oxygen? and how do you know?
Explanation: yes because H1 is water
Answer:
see the answer
Explanation:
Yes hydrogen can be used to make oxygen
because H1 is water
35. The dual nature of light deals with light as __________and light as ___________:
The dual nature of light deals with light as particles and as waves.
Dual nature of lightThe dual nature of light refers to the inherent characteristic of light to behave as waves on one hand and to behave as particles on another hand.
Light behaves as a special kind of wave known as an electromagnetic wave. Light behaves as waves in a different types of phenomena. These include:
light diffractioninterferencepolarizationLight has a wavelength, frequency, and velocity and has the ability to reflect, refract, interfere, and diffract just like a typical wave.
Light behaves as particles in two phenomena. These are:
Compton effectPhotoelectric effectLight has energy and moment just like every other particle.\
Due to these 2-face abilities, light is considered both a particle and a wave.
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a chemist has three different acid solutions. the first acid solution contains 25 % acid, the second contains 45 % and the third contains 85 % . he wants to use all three solutions to obtain a mixture of 260 liters containing 35 % acid, using 3 times as much of the 85 % solution as the 45 % solution. how many liters of each solution should be used?
Let,X = First acid solution contains 25% acid
Y = Second acid solution contains 45% acid
Z = Third acid solution contains 85% acid
Restriction given ,Z=3Y
So, X = First acid solution contains 25% acid
Y = Second acid solution contains 45% acid
3Y = Third acid solution contains 85% acid
Account for concentration of the intended acid solution;
= 25X + 45X + (3Y×85)/260 = 35
=25[X +12Y]/260 = 35
= X+12Y = 364. ————— equation (1)
Account for volume;
=X+Y+Z = 260
=X+Y + 3Y = 260
X+ 4Y = 260 ——————equation (2)
Substrate equation (2) from (1)
We get , Y = 13
Put Y = 13 in equation (2)
We get X = 208
and From X+Y+Z = 260; Z = 65
So ,208 ml of First solution ,13 ml of second solution and 65 ml of third solution should be used.
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What’s the concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine?
The concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine is 7.5 % v/v.
given that :
volume of solute = 15 mL
volume of solution = 200 mL
percent volume (v/v)% = (volume of solute/ volume of solution) × 100 %
percent volume (v/v)% = (15 mL / 200 mL ) × 100 %
percent volume (v/v)% = 0.075 × 100 %
percent volume (v/v)% = 7.5 % v/v.
Thus, The concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine is 7.5 % v/v.
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The particles in which type of substance can be separated by physical
means?
A. Compound
B. Element
C. Mixture
D. Molecule
Answer:
Mixture
Explanation:
Mixture are simply a physical combination of two or more substances. they can be separated based only by physical means, or by undergoing physical changes.
if the valence atomic orbitals of an atom are sp3 hybridized, how many unhybridized p orbitals remain in the valence shell?
It is to be noted that there are no p orbitals accessible for multiple bonding in an sp3 hybrid. The two unhybridized p orbitals are accessible for multiple bonding in sp hybridization.
What is an Unhybridized P Orbital?Bonds are formed using unhybridized p atomic orbitals. Two unhybridized p atomic orbitals from distinct atoms overlap side by side, resulting in a shared electron pair filling the area above and below the connecting line between the atoms (the internuclear axis).
An atom will contain the same amount of hybridized orbitals as electron density areas. There can be a total of four hybridized sp3 orbitals, thus take the number of regions of electron density and divide that by four to get the number of unhybridized p orbitals.
An atomic orbital is a function in atomic theory and quantum mechanics that describes the position and wave-like behavior of an electron in an atom. This formula may be used to determine the likelihood of locating any atom's electron in any given location surrounding the nucleus.
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Which of the following phrases best defines a redox (oxidation-reduction) reaction? (2 pts)
*
2 points
a reaction in which oxygen combines with different atoms
a reaction in which electrons are transferred between different atoms
a reaction in which electrons are released from the system
a reaction in which the number of oxygen atoms is reduced
Answer: A reaction in which electrons are transferred between different atoms
Explanation:
A redox reaction example:
oxidation: Zn(s) --> Zn^2+(aq) + 2e-
reduction: Cu^2+(aq) + 2e- --> Cu(s)
redox: Zn(s) + Cu^2+(aq) --> Zn^2+(aq) + Cu(s)
2 electrons are transferred between Zn and Cu.
Question 3 (1 point)
Tin lives in Atlanta and observes the moon as a waxing gibbous. Her cousin lives halfway around the world in China. Do Tin
and her cousin see the same phase of the moon at the same time?
Yes, Tin and her cousin see the same phase of the moon at the same time.
What is the moon?The Moon is described as the Earth's only natural satellite. The moon is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth.
Tin and her cousin see the same phase of the moon at the same time because because the phase of the Moon does not change as the Earth rotates.
There are eight moon phases and they include:
These eight phases are, in order,
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A 17. 5 ml portion of a 0. 5010 m na2co3 solution is added to 46. 0 ml of 1. 1250 m nacl. What is the concentration of sodium ion in the final solution?.
The concentration of sodium ions in the final solution is 0.94 M.
Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.
Calculation:-
C₁ = 0.5010
V₁ = 17.5 ml = 0.0175 L
C₂ = 1.1250
V₂ = 46 ml = 0.046 L
C₁V₁ + C₂V₂ = C × total volume
0.5010 × 0.0175 + 1.1250 × 0.046 = C × 0.0635 L
C = 0.0077 + 0.052 / 0.0635 L
= 0.94 M
The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of solution.
The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.
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2.8g of silicon react with 3.2g of oxygen to give a compound, which is shown below. The relative atomic mass of silicon is 28 and of oxygen is 16.What is the value of y in the formula below? SIOy
The value of Y in the formula when 2.8g of silicon react with 3.2g of oxygen, is 2
The numbers in the formula of a compound determine the ratio of moles of each element in the compound.
Given:
2.8g of silicon
3.2g of oxygen
[relative atomic mass of silicon is 28 and of oxygen is 16]
For silicon, n = 2.8 ÷ 28 = 0.1 (n= moles)
For oxygen, n = 3.2 ÷ 016 = 0.2
For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.1 moles.
For Silicon = 0.1/0.1 = 1
For Oxygen = 0.2/0.1 = 2
Taking the mole ratio as their subscripts.
The ratio of Si:O is 1:2
SiO[tex]_{2}[/tex] is the formula of silicon dioxide.
The value of y in the formula SiO[tex]_{Y}[/tex] is 2 when 2.8g of silicon react with 3.2g of oxygen.
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A buffer solution is prepared by adding NH4CIto a solution of NH3 (ammonia).NH3(aq) + H2O(0) = NH4+ (aq) + OH-(aq)What happens if HCl is added?
ANSWER
The addition of HCl will shift to reactants
EXPLANATION
When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.
Since the HCl is a strong acid, it will shift to the left (reactant sides)
1. You have two one-mole samples of a substance in its solid state. The purple solid has a
mass of 240 grams, while the blue solid has a mass of 130 grams. Which is the
hydrated version of the substance?
The purple solid salt that has a mass of 240 grams is the hydrated salt.
What are hydrated salts?Hydrated salts are salts that contain water molecules in their crystals. These water molecules are known as the water of crystallization.
The water of crystallization in salt is the number of moles of water that combines with one mole of a given salt.
Hydrated salts usually weigh more than salts that are not hydrated.
Also, in some salts, a combination with water in their crystals results in the formation of salt that is colored.
Salts that are hydrated can lose some or all of their water of crystallization when they are heated.
Considering the two salts given:
two one-mole samples of a substance in its solid state; The purple solid has a mass of 240 grams, while the blue solid has a mass of 130 grams.
The heavier salt will definitely be the hydrated salt.
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why are many devices that we use powerd by electricity?
Answer:
Explanation:
Because they have electrical cords :P But really, b/c electron movement is a convenient attribute of many elements. The electrons are "loose" on most metals, so they can conduct electricity.
Answer:
The benefits of power electronics are: High power density power supplies. Improved efficiency of up to 99% in power conversion. Noise-sensitive applications such as in medical devices are also transitioning to switching power supplies because of the efficiency and reliability.
Objective: Represent solutes and reactions in aqueous solutions, and write molecular, complete lonic
and net ionic equations.
Question: Write a balanced molecular equation, complete lonic equations, and net lonic equation for
the precipitation reaction between aqueous Copper (II) Nitrate and aqueous Potassium Sulfide.
Include explanations for determining the chemical formulas of the reactants and products, their phases,
and discussion of the types of reaction equations in your answer.
The reaction between Potassium sufide and copper nitrate is as follows:
Cu(NO3)₂ (aq) + K₂S (aq) ---> CuS (s) + 2KNO₃ (aq). It is a precipitation reaction.
In this reaction, copper(II) nitrate is reacting with potassium sulfide to form copper sulfide and potassium nitrate. Copper sulfide is insoluble in water, so it will precipitate out of the solution as a solid.
Cu(NO3)₂ (aq) + K₂S (aq) ---> CuS (s) + 2KNO₃(aq)
This is a precipitation reaction where the products are a solid and two aqueous solutions. The chemical formulas of the reactants are Copper (II) Nitrate and Potassium Sulfide. The products are Copper Sulfide and Potassium Nitrate. The phases of the reactants are aqueous, and the products are solid and aqueous.
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what does the S in S8 represent (Select All that Apply)
• An atom of Sulfur
• An isotope of Sulfur
• An allotrope of Sulfur
• A collection of atoms of Sulfur
Answer:
An atom of Sulfur
Explanation:
i did a Quick search and im trying to get pass the "help a person first"
Answer:
• A collection of atoms of Sulfur
Explanation:
I'll assume the notation is written as [tex]S_{8}[/tex]. A subscript after an element symbol represent the number of individual atoms of the symbol. In this case [tex]S_{8}[/tex] is telling us we have 8 sulfur atoms that are somehow connected to each other. That is in contrast with 8S, which means we have 8 different sulfur atoms. A chemical formaula, such as [tex]CH_{4}[/tex] tells us we have a molecule containing 1 carbon atom and 4 hydrogen atoms.
Complete reaction carbon-13 + alpha = oxygen-16 + x0123456789abcdefghij edited question
This is a perfect answer
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[tex]\text{y = ax + b}[/tex]How can a reaction generally be made to go more quickly?Check all that apply.A.Cooling the reactionB.Adding a catalystC.Lowering the activation energyD.Shaking the reactants
Answer
A reaction generally can be made to go more quickly by:
B. Adding a catalyst
C. Lowering the activation energy
D. Shaking the reactants
Explanation
The presence of a catalyst increases the rate of a reaction by lowering its activation energy. Chemical reactions occur when molecules collide with each other and undergo a chemical transformation.
Stirring and shaking provide some kinetic energy to the system. It increases slightly its temperature and the reaction rate. increasing the kinetic energy of reactant particles also means more of the reactant particles will have the minimum amount of energy required to form products (ie, activation energy) which leads to more successful collisions and therefore increases the reaction rate.
A beam of light has a wavelength of 280 nanometers. What is the frequency of the light? Show all work!
A beam of light has a wavelength of 280 nanometers. The frequency of the light is 1.07 × 10¹⁵ Hz.
the information in the question is given as :
wavelength of beam of light = 280 nm
the relation between the frequency and the wavelength is given as :
F = c / λ
where,
F = frequency of the light
c = speed of light
λ = wavelength of light
speed of light , c is = 3 × 10⁸ m/s
substituting all the value in the formula for the frequency, we get:
F = c / λ
F = 3 × 10⁸ / 280 × 10⁻⁹
F = 0.0107 × 10¹⁷ Hz
F = 1.07 × 10¹⁵ Hz
Thus, A beam of light has a wavelength of 280 nanometers. The frequency of the light is 1.07 × 10¹⁵ Hz.
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Atomic Structure Online Practice
Complete this assessment to review what you've learned. It will not count toward your grade.
The element phosphorous (P) has an atomic number of 15 and an atomic mass of 31. How many neutrons are in an atom of
phosphorous (P)? (1 point)
O 15
O 16
O 31
O 46
The correct answer is 16 that is the element Phosphorous has 16 neutrons.
The neutron is known as a subatomic particle that is slightly heavier than a proton and has a neutral charge (one that is neither positive nor negative). Atomic nuclei consist of both protons as well as neutrons.
Protons and neutrons both are referred to as "nucleons" because of how similarly they function inside the nucleus and because they both have masses that are about equal to one atomic mass unit.
Nuclear physics explains their interactions and characteristics. Each proton and neutron is made up of three quarks, hence they are not fundamental particles.
The arrangement of electrons around an atom's heavy nucleus mostlydetermines its chemical characteristics. The atomic number, or we can say number of protons, which determines the charge of the nucleus, determines the electron configuration.
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Create a table showing how each type of radiation
affects the atomic number and mass number of an
atom.
The emitting element's atomic number and atomic mass number are both reduced by 2 and 4 respectively by alpha radiation. The atomic number of an element is increased by 1 by beta radiation, but the atomic mass number is unaffected. The atomic number or the atomic mass number are unaffected by gamma radiation.
What is radiation ?An unstable atom will release energy on its own to move into a more stable state, which is radioactivity. The energy that is released by a radioactive atom is known as ionizing radiation. The term "radioactive isotope" refers to radioactive atoms of the same element with varying neutron counts.
Alpha radiation decreases the atomic number and atomic mass number of the emitting element by 2 and 4 correspondingly. Beta radiation raises an element's atomic number by 1, but it has no effect on its atomic mass number. Gamma radiation has no impact on the atomic number or atomic mass number.
The atomic or mass number are unaffected by the emission of gamma rays, however the nucleus will become more stable. The most significant change in atomic number and mass number is brought on by alpha radiation.
A table showing how each type of radiation affects the atomic number and mass number of an atom is attached in the image below.
Thus, The emitting element's atomic number and atomic mass number are both reduced by 2 and 4 respectively by alpha radiation.
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how many hydrogen atoms are in 3Fe(OH)2
Answer:
six
Explanation:
This is kinda like 3 * (Fe + 2O + 2H) which would be SIX hydrogen atoms ( or 3 hydrogen molecules)
Electrolysis is performed upon molten MgCl2. platinum electrodes are used. (a) write the cathode and anode half reactions
Electrolysis occur when an electric current is passed through a liquid or solution thereby causing the decomposition of chemicals.
For magnesium chloride, it will be heated to be able to conduct electricity. When molten, the MgCl2 will decomposes into Mg2+ and 2Cl- ions. During electrolysis, the elements are separated according to the equations;
[tex]\begin{gathered} Mg^{2+}+2e^-\rightarrow Mg(s) \\ 2Cl^-\rightarrow Cl_2(g) \end{gathered}[/tex]According to the half reactions, the Mg2+ is reduced at the cathode (-) and the Cl- is oxidized at the anode (+). Reduction at the cathode shows that magnesium gains two electrons to form a magnesium solid while the chlorine ion looses two electrons at the anode
exactly fifty milliliters of water is measured out in a graduated cylinder . an object is dropped in the water. the level of the water rises to 75 milliliters. when taking the mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. what is the density of the object
The mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. then the density is 2.67 g / cm³.
What is density?Density is defined as the evaluation of how closely something is packed. Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion.
Density can be expressed as
Density = mass / volume
Given
Mass = 100 + 95 + 5 /3
= 200 / 3
= 66.7 g
Volume = Initial volume - final volume
= 50 - 75
= 25 ml
Density = 66.7 / 25
= 2.67 g / cm³
Thus, the mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. then the density is 2.67 g / cm³.
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Covalent compounds are formed when metals are bonded to nonmetals? True or Flase
Answer:
Covalent compounds are always formed between two non-metals.
Explanation:
The answer is FALSE!
Covalent compounds are always formed between two non-metals. The non-metal can not lose electrons they can only gain the electron or they can share the electron to complete its octet.
Hope this helps!
Answer:
The covalent compounds are always formed by 2non-metal elements, so the answer is false
2C8H18(I) + 25 O2 (g) = 16 CO2(g) + 18 H2O (g)If 4.00 moles of gasoline are burned, what volume of oxygen is needed if the pressure is 0.953 atm and the temperature is 35 C?
Answer
Volume of O2 = 1326 L
Explanation
Given:
2C8H18(I) + 25 O2 (g) = 16 CO2(g) + 18 H2O (g)
moles of gasoline = 4.00 mol
Pressure = 0.953 atm
Temperature = 35 C = 308 K
Required: volume of oxygen
Solution
Step 1: use stoichiometry to find the moles of oxygen
The molar ratio between gasoline and O2 is 2:25
Therefore the moles of o2 = 4.0 mol x (25/2) = 50.0 mol
Step 2: Calculate the volume using ideal gas law
PV = nRT
V = nRT/P
V = (50.0 x 0,08206 x 308)/0.953
V = 1326 L
pls answer question will mark brainliset tyty
Answer:
Answer is C,
Explanation:
It diminished local resources, decreasing the population.