2.96 × 10²³ molecules is required if Alex drips hydrochloric acid onto a 5.9 g piece of magnesium in a single displacement reaction
According to this question, hydrochloric acid (HCl) reacts with magnesium metal (Mg) to produce magnesium chloride and hydrogen has as follows:
2HCl(aq) + Mg(s) → MgCl2(aq) + H2(g)
Based on the balanced chemical equation above; 2 moles of HCl reacts with 1 mole of Mg. Next, we convert 5.9g of Mg to moles by using the formula; mole = mass/molar massWhere; Mg = 24g/mol
mole = 5.9/24
mole = 0.246mol of Mg
If 2 moles of HCl reacts with 1 mole of Mg. 0.246 mol of Mg will react with (0.246 × 2) = 0.492mol of HClTo convert mole to number of molecules, we multiply number of moles by 6.02 × 10²³ (Avogadro's no.)
Hence, number of molecules of HCl required is 0.492mol × 6.02 × 10²³
= 2.96 × 10²³ molecules of HClHCl
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arrange the metals sodium,copper, and magnesium in the decreasing order of their reactivity
Answer:
sodium>magenisium>copper
Assuming that no equilibria other than dissolution are involved, calculate the concentration of all solute species in each of the following solution of salt in contact with a solution containing a common ion. Show that changes in the initial concentrations:
PbCl2(s) in 0.631 M MgCl2 (MgCl2 is strong electrolyte)
Ksp PbCl2 = 1.6 × 10−5
The concentration of all solute species in the solution are:
[tex][Mg^{2+} ] = 0.631 M \\ [Pb] = 1.0 \times 10^{-5} M \\[Cl^{-} ] = 1.26 M[/tex]
MgCl₂ (0.631 M) is a strong electrolyte that dissociates according to the following equation.
MgCl₂(aq) ⇒ Mg²⁺(aq) + 2 Cl⁻(aq)
Considering the molar ratios, the initial concentrations of Mg²⁺ and Cl⁻ are:
[tex]\frac{0.631 mol MgCl_2}{L} \times \frac{1molMg^{2+} }{1molMgCl_2} = \frac{0.631molMg^{2+}}{L} \\\frac{0.631 mol MgCl_2}{L} \times \frac{2molCl^{-} }{1molMgCl_2} = \frac{1.26molCl^{-}}{L}[/tex]
Cl⁻ is a common ion between MgCl₂ and PbCl₂. To consider the solution equilibrium for PbCl₂ (a sparingly soluble salt), we will make an ICE chart.
PbCl₂(s) ⇄ Pb²⁺(aq) + 2 Cl⁻(aq)
I 0 1.26
C +x +2x
E x 1.26+x
The solubility product constant, Ksp, is:
[tex]Ksp = 1.6 \times 10^{-5} = [Pb^{2+} ][Cl^{-} ]^{2} = (x) (1.26+x)^{2}[/tex]
Since 1.26 >>> x, 1.26 + x ≈ 1.26.
[tex]Ksp = 1.6 \times 10^{-5} = (x) (1.26)^{2}\\x = 1.0 \times 10^{-5}[/tex]
The concentration of all solute species in the solution are:
[tex][Mg^{2+} ] = 0.631 M\\ [Pb] = x = 1.0 \times 10^{-5} M\\[Cl^{-} ] = 1.26+x = 1.26 M[/tex]
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One of the electron transitions in a hydrogen atom produces infrared light with a wavelength of
8.231 x 10°m. What amount of energy causes this transition?
A transition occurs when an electron absorbs energy and moves from one energy level to another.
Let us recall the formula;
E = hc/λ
h= planks constant = 6.6 * 10^-34 Js
c = speed of light = 3 * 10^8 ms-1
λ = wavelength =
We can see from the question that the exponent in the value for the wavelength was not properly rendered hence we can not be able to substitute values and obtain a numerical answer for the energy of the infrared radiation.
However, if all the values are properly substituted, then the energy of the infrared radiation can conveniently be obtained.
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In water, a substance that ionizes completely in solution is called a
Answer:
please mark me brainliest
Explanation:
In water, a substance that ionizes completely in solution is called a weak electrolyte.
Answer: strong electrolyte.
Explanation: In water, a substance that ionizes completely in solution is called a. a. weak electrolyte.
Write chemical equations for the reactions that occur when solutions of the following substances are mixed:
c. OH- and H₂PO₄-
d. C₅H₅N pyridine, a base) and HC₂H₃O₂ (acetic acid)
#c
[tex]\\ \rm\hookrightarrow H_2PO_4^-+OH-\longrightarrow HPO_4^{2-}+H_2O[/tex]
H_2PO_4 is a base according to bronsted Lowry theory.So it loses a H+ and OH- takes that to form water#2
[tex]\\ \rm\hookrightarrow C_5H_5N+C_2H_4O_2\longrightarrow C_6H_6N^++C_2H_3O_2^-[/tex]
Pyridine is a bronsted base .So it forms pyridine cation by taking one H^+ from acetic acidYou are
working with a combustible material. Which piece of safety
equipment is most important to have on hand?
Which of the following is an example of a scientific theory?
Matter can be neither created nor destroyed.
Force equals mass times acceleration.
Matter behaves the way it does because it is made of atoms.
There is probably life on Mars.
C. Matter behaves the way it does because it is made of atoms.
Answer:
Matter can neither be created nor destroyed
Explanation:
Mark me. as brainliest
What is the quantity of heat evolved when 15g of CH4 is completely burned in air? Given that CH4+2O2→ CO2+2H2OΔH=-890Kj/mol
Answer:
You're going to have to convert the grams to moles, and then multiply that with the ratio of heat produced to the ratio of CH4
Are acids harmful to work with.
Answer:
yes it is
Explanation:
because there are some acid which really harm skin.
What best describes the goals of scientific investigation and technological development?
Both scientific investigation and technological design aim to solve problems by making more cost-effective and affordable products.
Both scientific investigation and technological design aim to conduct experiments to uncover new information and share the results.
Scientific investigation aims to design products that can make use of new information, whereas technological development aims to conduct experiments to improve affordability and availability.
Scientific investigation aims to design and implement an experiment to learn new information, whereas technological development aims to design a product to solve a problem.
Answer: D. Scientific investigation aims to design and implement an experiment to learn new information, whereas technological development aims to design a product to solve a problem.
Explanation:
Why must beta particles be used to detect leaks in a pipe?
Why must beta particles be used to detect leaks in a pipe?
A. Beta particles will not be absorbed by the soil like gamma radiation, but won't pass through the pipe before reaching the leak like alpha radiation would.
B. Beta particles will not cause an electrical discharge like alpha particles when they interact with the metal pipe, or contaminate the water like gamma radiation.
C. Beta particles are not used, only alpha particles are used because they are not harmful to humans.
D. Beta particles will not be absorbed by the soil like alpha particles, but won't pass through the pipe before reaching the leak like gamma radiation would.
Should be D, because alpha particles are absorbed by soil and gamma isn't
Beta particles will not be absorbed by the soil like alpha particles, but won't pass through the pipe before reaching the leak.
What is Beta particle?This type of particle is a high-speed electron and is derived from the process of beta decay.
It is used to detect leaks in pipe because it will not be absorbed by the soil like alpha particles, but won't pass through the pipe before reaching the leak like gamma radiation would.
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A number is three times the difference between twenty and the number. What is the number?
Answer:
the number is 7
Explanation:
"Three times" means multiply by 3
"Difference" means subtract
"Sum" means add
3(x - 7) = 23 - (3x + 2)
3x - 21 = 23 - 3x - 2
3x - 21 = 21 - 3x
6x = 42
x = 7
How
many grams of oxygen gas
are
produced
when 2.43x10(4) g of KClO3
are
completely
reacted
according
to
the
following
chemical
equation:
2 KClO₃(s)
→
2 KCl(s)
+
3 O₂(g)
Answer:
2 KCl(s)
Explanation:
just took the exam
Taking into account the reaction stoichiometry, 9717.75 grams of oxygen gas are produced when 2.43×10⁴ grams of KClO₃ are completely reacted.
The balanced reaction is:
2 KClO₃ → 2 KCl + 3 O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KClO₃: 2 moles KCl: 2 moles O₂: 3 molesThe molar mass of each compound is:
KClO₃: 122.55 g/mole KCl: 74.55 g/moleO₂: 32 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
KClO₃: 2 moles× 122.55 g/mole= 245.1 gramsKCl: 2 moles× 74.55 g/mole= 149.1 gramsO₂: 3 moles× 32 g/mole= 96 gramsThen you can apply the following rule of three: if by reaction stoichiometry 245.1 grams of KClO₃ form 96 grams of O₂, 2.43×10⁴ grams of KClO₃ form how much mass of O₂?
[tex]mass of O_{2} =\frac{2.43x10^{4} grams of KClO_{3} x 96 grams of O_{2}}{245.1grams of KClO_{3} }[/tex]
mass of O₂= 9517.75 grams
In summary, 9717.75 grams of oxygen gas are produced when 2.43×10⁴ grams of KClO₃ are completely reacted.
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https://brainly.com/question/14799852?referrer=searchResultshttps://brainly.com/question/15181649?referrer=searchResultshttps://brainly.com/question/2194112?referrer=searchResultshttps://brainly.com/question/14709513?referrer=searchResultsIn the reaction A + B + C + D, what are the reactants?
O A. Just B
B. Cand D
O c. A and B
O D. A and C
Answer:
C.
Explanation:
I believe that it should be A and B.
why styrene undergoes and ionic polymerization at a faster rate than p methoxystyrene
Answer:
In styrene, there is a phenyl group which is electron-withdrawing. So the electronic density in the double bonds increases, hence easy to associate as monomers. While in methoxystyrene, there is a carbonyl group which is not electron deficient. so no easy association with monomers.
Explanation:
[tex]{ \sf{styrene \: is \: phenylethene \: }} \\ { \sf{its \: polymer \: is \: polystyrene}}[/tex]
A team of researchers is working on a project to make a new kind of carbonless fuel. During their experiment, there is an explosion tha
the lab. While they are cleaning the debris, they discover three pieces of frozen metal. The researchers were excited to report that they
discovered a fuel that burns so clean it becomes cold. Which statement best explains why this scenario represents "bad" science?
The frozen metal was discovered through biased research practices.
The clean fuel experiment lacks controlled variables due to the explosion.
The experiment is replicable because the testing conditions are included.
The result of clean fuel production, the frozen metal, is not observable.
The correct answer is; "The frozen metal was discovered through biased research practices."
Scientific research is based on standard practices and not on personal bias hence they should not have taken a decision based on the frozen metals. Bias prevents a researcher from taking an objective look at experimental observations before arriving at a conclusion.
The greatest pitfall that must be avoided when conducting a scientific study is bias.
A bias is introduced when there is a disparity between observation and interpretation of data in a scientific study.
In the case of this question, the researchers already wanted to establish the possibility of obtaining a carbonless fuel. Their minds were so clouded with this bias that they forgot to thoroughly investigate the pieces of frozen metal thereby arriving at a lobe-sided, unscientific conclusion. This makes their work, "bad" science.
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Answer:
it would be A The conditions of the experiment are not replicate able or repeatable.
Explanation:
A team of researchers is working on a project to make a new kind of carbonless fuel. During their experiment, there is an explosion that destroys the lab. While they are cleaning the debris, they discover three pieces of frozen metal. The researchers were excited to report that they had discovered a fuel that burns so clean it becomes cold. Other scientists attempt to make the carbonless fuel but are unsuccessful. Which statement best explains why this scenario represents "bad" science?
The conditions of the experiment are not replicable or repeatable.
The process of making clean fuel is known due to the explosion.
The frozen metal was discovered through biased research practices.
The result of clean fuel production, the frozen metal, is not observable.
Which option is an isotope with 6 protons and 8 neutrons? (1 point)
O oxygen-6
o carbon-14
o oxygen-14
o carbon-8
Answer:
Carbon-14
Explanation:
It is because it have 6 protons and 8 neutrons which are added together to form an atomic mass of 14.
The mass number of an isotope is the sum of the number of protons and number of neutrons hence the correct answer is carbon-14.
Isotopes are atoms of the same element that has the same number of protons but different number of neutrons.
The atomic number is the same as the number of protons in the atom. Since there are six protons in the atom, the element must be carbon.
There are eight neutrons meaning that the mass number is 8 + 6 = 14
Therefore, the isotope is carbon-14.
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HELP! Which type of model best represents simple molecules?
A. wire
B. ribbon
C. structural formula
D. Lewis dot
Which of the following statements accurately describes how a catalyst acts in a chemical reaction?
I. Decreases the kinetic energy of the reaction
II. Is not consumed by the reaction
III. Increases the equilibrium constant
IV. Reduces the required activation energy
a) II, III, and IV only
b) I and III only
c) I and II only
d) II and IV only
Answer:
d) II and IV only.
Explanation:
A catalyst increases the kinetic energy of reactant molecules which increases the magnitude of collision. These then decreases the activation energy . A catalyst is not consumed by reaction because it is neither reactant nor a product, hence has no effect on equilibrium constant.
[tex].[/tex]
Answer:
A
Explanation:
it speed up a chemical reaction without being consumed by the reaction and increases the reaction rate by lowering the activation energy for a reaction but the average kinetic energy of the molecules remains the same well the required energy decreases
Convert the concentration of 0.700 M Na2SO4 to g/mol
To convert from mass concentration to molar concentration we use the formula;
Mass concentration = molar concentration * molar mass
Molar concentration of Na2SO4 = 0.700 M
Molar mass of Na2SO4 = 2(23) + 32 + 4(16) = 142 gmol-1
Hence;
Mass concentration = 0.700 M * 142 gmol-1
Mass concentration = 99.4 g/mol
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which are the nutrients essential to us
Explanation:
carbohydrate,fat,protein, vitamin, mineral, water
Answer:
There are six major nutrients: Carbohydrates (CHO), Lipids (fats), Proteins, Vitamins, Minerals, Water.
A change in direction in a wave when it passes through an opening is called
Answer:
Refraction
Explanation:
the change in direction of waves that occurs when waves travel from one medium to another. ... Diffraction is the bending of waves around obstacles and openings. The amount of diffraction increases with increasing wavelength
Answer:
A change in direction in a wave when it passes through an opening is called diffraction.
I hope this helps
Heating water makes most solids in it
soluble, and it makes gases
soluble.
Increasing the pressure on a gas above water makes the gas
soluble. Compounds with comparatively stronger ionic bonds are
soluble.
Answer:
1. more
2. less
3. more
4. less
Explanation:
Given the reactants of the chemical reaction that will take place in Part D (construction of a lead concentration cell) prior to the assembly of the cell, determine the type of chemical reaction it is. Hint: Determine the products of the reaction.
Answer:
hi
Explanation:
Rewrite this measurement with a simpler unit, if possible.
4.5·m2m2m
Answer:
why are people s opinions and prejudices her greatest obstacles
Name the following alkane molecule:
A. methylpentane
B. 2-methylpentane
C. 2-ethylpentane
Answer:
B
Explanation:
its upside down but I'm 99% sure
Which of the following metals will liberate hydrogen from dilute HCL? A. Ag B.Au C.Hg D.Sn
Answer:
ag and au are sure not to react. but hg and sn might or might not
what is the zeff of carbon ??????
plz bata do
Answer : La carga nuclear efectiva (Zef) es la carga positiva neta experimentada por un electrón en un átomo polielectrónico. El término "efectiva" se usa porque el efecto pantalla de los electrones más cercanos al núcleo evita que los electrones en orbitales superiores experimenten la carga nuclear completa
Explanation:
tính chất hóa học của propylen
Answer:
Propilen là một chất khí không màu với mùi giống như dầu mỏ. Propilen nhẹ hơn nước và tan rất ít trong nước 0.61 g/ . Không hòa tan trong các dung môi phân cực như nước, chỉ tan trong dung môi không phân cực hay ít phân cực.. Propilen không có tính dẫn điện.
How many of shapes has the same number as the red oval.
The number of shapes that has the same number as the red oval is; 5
All the shapes has the same number as the red oval exempt the shape at the bottom right, this is because the text in the bottom right shape has one 8 missing at the end before 622.
Hence the number of shapes that has the same number as the red oval is 5
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