Answer:
Multiplying the number of moles of the sample by Avogadro's number
Explanation:
The process that will help determine the number of atoms in a sample is by multiplying the number of moles of the sample by Avogadro's number.
The number of moles of substance has a wide range of application in quantitative chemistry.
A mole of any substance contains the Avogadro's number of particles. The particles can be atoms, molecules, formula units, neutrons, protons, electrons etc.
So, when we have the number of moles of a substance, the number of atoms is obtained by multiplying with the Avogadro's constant.
Question 12 of 25
Which of the following is the best summary of Avogadro's law?
A. Equal amounts of all gases occupy 22.4 L at all conditions.
B. Equal amounts of all gases have the same volume at the same
conditions,
C. Every gas has a different volume at STP.
D. The volume a gas occupies depends on gas type.
SUBMIT
Answer:
B. Equal amounts of all gases have the same volume at the same
conditions
Explanation:
Amedo Avogadro found the relationship between volume of a gas and the number of molecules contained in the volume.
The law states that "equal volumes of all gases at the same temperature and pressure contains equal number of molecules or moles".
The law describes the behavior of gases when involve in chemical reactions. It enables one to change over at will in any statement about gases from volumes to molecules and vice versa.
So, the right option is B which implies that equal amounts of all gases have the same volume at the same conditions.
Which of the following is a molecular compound?
D KI
D CC14
NaBr
0 MgCl2
Answer:
it is NaBr. It is known as sodium bromide.
50POINTS!
What is the volume of a 11.2 moles of carbon dioxide gas at STP?
A. 0.993 L
B. 56.3L
C. 150L
D. 251L
Explain your answer
Answer:
Hi. I'll explain
Explanation:
[tex]11.2mol \times \frac{22.4liter}{1mol} = 250.88 [/tex]
If you round it it will be 251
D is the answer (251)
Which element easily loses one electron to form a positive ion?
A.
Lithium (Li)
B.
Flourine (F)
C.
Magnesium (Mg)
D.
Nitrogen (N)
Answer:
A.Lithium (Li)
since fluorine and nitrogen gain electron and becomes negative ion.
since magnesium loose two electron.
1. Put the following steps in order, please number 1‐6.
_______Hypothesis
_______ Draw Conclusion
_______ Experiment
_______ Ask a Question
_______ Analyze data
_______ Collect Observations
Answer:
1.hypothesis
2.ask a question
3.experiment
4.collect observations
5.analyze data
6.draw conclusion
Explanation:
When equal volumes of 0.5 M H2SO4 and 0.5 M NaOH are mixed, the resulting solution is
The concentration of mixed solution = 0.5 M
Further explanationGiven
0.5 M H₂SO₄
0.5 M NaOH
Required
The concentration
Solution
Molarity from 2 solutions :
Vm Mm = V₁. M₁ + V₂. M₂
m = mixed solution
V = volume
M = molarity
V = mixed volume
1 = solution 1
2 = solution 2
Vm = V₁+V₂
Equal volumes⇒V₁=V₂, and Vm = 2V, then equation becomes :
2V.Mm = V(M₁+M₂)
2V.Mm = V(0.5+0.5)
Mm=0.5 M
Calculate the concentration of hydrogen ions in a healthy person’s blood that has a pH of 6.40.
Answer:
[H⁺] = 3.98×10⁻⁷ M
Explanation:
Given data:
pH of blood = 6.40
Hydrogen ion concentration = ?
Solution:
Formula:
pH = - log[H⁺]
by rearranging this formula,
[H⁺] = 10⁻(pH)
By putting values,
[H⁺] = 10 ⁻⁶°⁴⁰
[H⁺] = 3.98×10⁻⁷ M
2 2. The energy stored in a substance that can be released when the substance reacts. A. Mechanical Energy B. Thermal Energy C. Chemical Energy D. Potential Energy
Answer:
C. Chemical Energy
Explanation:
The energy that stored in the substance or in compounds is called chemical energy which released when the substance reacts.
A substance is made up of atoms and molecules and chemical energy is present in those atoms or molecules. When a chemical reaction takes place, these energy released from atoms and molecules.
Chemical energy can be released in the form of thermal energy (heat) and mechanical energy (working ability).
Hence, the correct answer is "C. Chemical Energy".
rearrange the expression in to quadratic form
0.20=²÷45−
......what is that 2 after =
For each of the following compounds determine the molecular geometry (shape) using VSEPR theory and identify the hybridization of the central atom, respectively.
a. CO2F^-
b. S2Cl2(CISSCI)
Answer:
See explanation
Explanation:
Usually, the central atom in a molecule is often the atom having the least electronegativity in the compound.
In CO2F^-, the central atom is carbon. The structure is related to the structure of CO2. In CO2F^-, carbon is sp hybridized. The molecule is linear.
In S2Cl2, sulphur is the central atom. There are two central sulphur atoms each connected to one chlorine atom. The sulphur atoms are sp3 hybridized with two lone pairs on each sulphur atom. The molecular geometry is bent.
[tex]CO_2F^-[/tex] has a flat geometry, with carbon as the central atom. On the other hand, [tex]S_2Cl_2[/tex] has a folded geometry, with two sulfur atoms as the central atoms.
We can arrive at this answer because:
The central atoms of a molecule are determined by the level of attraction of the atoms during binding.The atom that has less electronegativity is the one that is positioned in the center of the molecule and has its atoms attracted and pulled by more electronegative molecules that are positioned on the sides and has its electrons closer to it.During this binding and because of the difference in electronegativity, the molecule can assume a flat or folded geometrical position.In this case, when we observe the position of the atoms and the geometry of the molecules of [tex]CO_2F^-[/tex] and [tex]S_2Cl_2[/tex] we can see that they are flat and folded as shown in the figure below.
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How many moles of argon are contained in 58 L of At at STP?
Answer:
n = 2.58 mol
Explanation:
Given data:
Number of moles of argon = ?
Volume occupy = 58 L
Temperature = 273.15 K
Pressure = 1 atm
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1 atm × 58 L = n × 0.0821 atm.L/ mol.K × 273.15 K
58 atm.L = n × 22.43 atm.L/ mol.
n = 58 atm.L / 22.43 atm.L/ mol
n = 2.58 mol
The reaction Pb(NO3)2 (aq) + 2 Kl (aq) ---> Pbl2 (s) + 2 KNO3 (aq) is a(n)
What reaction is this?
Answer:
Double decomposition reaction
Explanation:
The reactants potassium iodide and lead nitrate react to from potassium nitrate and lead iodide, From this it is clear that, radicals are intercharged by the decomposition of reactants. Hence, it is a double decomposition reaction.
Problem: so- if a wave has a wave speed of 1000 M/S anything see a 500 HZ, what is its wavelength?
Given
speed = 1000 m/s or velocity (v) = 1000 m/s
frequency (f) = 500 Hz
wavelength (λ) = ?
We know,
λ = v/f
λ = 1000/ 500
λ = 2 m
It's wavelength is 2 m.
Hope it will help :)
If a wave has a wave speed of 1000 M/S anything see a 500 HZ, the wavelength of wave is 2 m.
What is wavelength?
The distance among identical spots between two succeeding waves is known as the wavelength, which is a feature of waves. The wavelength of a wave is the distance among one wave's peak (or trough) and the next. In mathematics, the Greek symbol lambda () is used to denote wavelength.
The color of light is determined by its wavelength, and the pitch of sound is determined by its wavelength. The visible spectrum of light has wavelengths between around 700 nm (red) and 400 nm (violet). The color of light is determined by its wavelength, and the pitch of sound is determined by its wavelength.
speed = 1000 m/s
frequency = 500 Hz
wavelength (λ) = ?
λ = v/f
λ = 1000/ 500
λ = 2 m
Therefore, the wavelength of wave is 2 m.
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In the year 2016, a mishap took place near Mahad in the Raigad district of Maharashtra. The 106 years old British-era bridge over the Savitri River collapsed into the river. Two buses carrying 22 people went missing after being swept away by the river. Navy divers, helicopter of Coast Guard began the rescue operation of the affected area. A 300 kg magnet was lowered into the swollen Savitri River by the rescue team. Why do you think the huge magnet was lowered into the river?
Answer:
to locate and possibly retrieve the buses
Explanation:
The buses are presumed to be made of steel. Presumably, a bus and the magnet are mutually attractive. The magnet could be used to locate a missing bus, and possibly retrieve it.
The normal boiling point occurs when the Group of answer choices vapor pressure of a pure liquid equals an external pressure of one atmosphere. vapor pressure of the liquid equals the external pressure. temperature of the pure liquid equals the external temperature. intermolecular forces within the liquid phase are broken.
Answer:
A. vapor pressure of a pure liquid equals an external pressure of one atmosphere.
Explanation:
Boiling point of a chemical substance can be defined as the specific temperature in which the vapor pressure of a liquid is equal to the atmospheric pressure around the liquid and as a result causing the liquid to transform into a vapor.
The normal boiling point occurs when the vapor pressure of a pure liquid equals an external pressure of one atmosphere (1 bar) and thus, causing bubbles of vapor to form.
An arctic weather balloon is filled with of helium gas inside a prep shed. The temperature inside the shed is . The balloon is then taken outside, where the temperature is . Calculate the new volume of the balloon. You may assume the pressure on the balloon stays constant at exactly . Round your answer to significant digits.
Answer:
9.11 L
Explanation:
An arctic weather balloon is filled with 10.2 L of helium gas inside a prep shed. The temperature inside the shed is 9 °C. The balloon is then taken outside, where the temperature is -21 °C. Calculate the new volume of the balloon. You may assume the pressure on the balloon stays constant at exactly 1 atm. Round your answer to 3 significant digits.
Step 1: Given data
Initial volume (V₁): 10.2 LInitial temperature (T₁): 9 °CFinal volume (V₂): ?Final temperature (T₂): -21 °CStep 2: Convert the temperatures to the Kelvin scale
We will use the following expression.
K = °C + 273.15
K = 9 °C + 273.15 = 282 K
K = -21 °C + 273.15 = 252 K
Step 3: Calculate the final volume of the balloon
We can calculate the final volume of the balloon using Charle's law.
V₁/T₁ = V₂/T₂
V₂ = V₁ × T₂/T₁
V₂ = 10.2 L × 252 K/282 K = 9.11 L
The coyote is found across North America which makes it a specialist species.
Answer: false
Explanation:
23. How many different elements are in the compound sodium carbonate (Na2CO3)? *
a. 1
b. 3
C. 6
d.7
Na, C, and O so the answer is c. 3
A breeder reactor is one type of nuclear reactor. In a breeder reactor, uranium-238 is transformed in a series of nuclear reactions into plutonium-239.
The plutonium-239 can undergo fission as shown in the equation below. The X represents a missing product in the equation.
Compare the amount of energy released by completely fissioned plutonium-239 to the amount of energy released by the complete combustion of the same amount of coal.
Answer:
Hope it helps
Explanation:
How can you tell if glucose is present?
Answer:
The glucose urine test measures the amount of sugar (glucose) in a urine sample.
the electronic configuration of an element is 1s2s22p6. How many valence electrons does it have?
Answer:
8
Explanation:
Inside this shell
In p orbital there r 6 electrons
And in s orbital thr is 2
Add them
3
(2 Points)
How many moles of CO2 is 6.9x1030 particles of CO2?
A. 1.1x10’moles
B. 1.1x10 moles
C.1.3x103 moles
D. 1.3x10’moles
Answer:
Explanation:
B
7) An ionic bond could form between:
(a) magnesium and potassium
(b) fluoride and chloride
(c) nitrogen and rubidium
(d) chlorine and xenon
Explanation:
Answer:
the answer is nitrogen and rubidium (C)
Explanation:
ionic bonds only form between metals and non-metals
Use molecular orbital theory to determine which of the following dicarbon species is expected to have the longest bond length. Use the following valence MO order: σ2s < 'σ*2s < π2py = π2pz < σ2px < π*2pz < σ*2px.
a. C2^-2
b. C2^-
c. C2
d. All the dicarbon species have the same bond length
e. C2+
Answer:
e. C2+
Explanation:
In the molecular orbital theory, the valence electrons in molecules are filled into molecular orbitals in accordance with Hund's rule and Pauli exclusion theory.
The orbitals are filled in order of increasing energy (Aufbau principle) as shown in the question. The bond order refers to half the difference between the number of bonding and antibonding electrons in the molecule.
The smaller the bond order the longer the bond length and vice versa. The specie having the least bond order is C2+ with a bond order of 1.5. This specie certainly has the longest bond length also. Hence the answer.
Applying molecular orbital theory the dicarbon specie that has the longest bond length is ; ( E ) C₂⁺
The valence electrons in molecules fill up molecular orbits in accordance to Pauli exclusion theory and Hund's rule. while
The bond order is the difference between bonding and antibonding electrons found in a molecule divided into half. while the molecule orbitals are filled according to increasing energy in accordance to Aufbau principle
The bond order of a molecule is inversely proportional to the bond length of the molecule. Therefore the dicarbon specie that has the longest bond length is C₂⁺ because it has the shortest bond length of approximately 1.5.
Hence we can conclude that Applying molecular orbital theory the dicarbon specie that has the longest bond length is ; ( E ) C₂⁺
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Using the law of conservation of energy, what is the kinetic energy at C? K.E. =
Explanation:
It is also important to note that potential energy can be positive, zero or negative. ... Now that the kinetic energy and potential energy have been defined, we can now apply the Law of Conservation of Energy. In other words, the kinetic energy plus the potential energy equals a constant (KE+PE=Constant).
Answer: It's six, I believe.
Explanation:
Below are pictures of a coastline and a river. Which of the following changes to the Earth's surface can be caused by wind and water
Answer: Both the shape of a coastline and the path of a river
Explanation: i did that test
Convert 10 kilometers to miles
Answer:
6.21
Explanation:
Answer:
6.21371192 or ~ 6.21
Explanation:
10 kilometers is the same as 6.21371192 miles or ~ 6.21
All you need to do is divide the value of the kilometers by "1.609344" to convert it, into miles
Hope this helped!
Have a supercalifragilisticexpialidocious day!
What is the percent composition of each element in Fe (Cr202)3?
I dont knowExplanation:
Identify the element of Period 2 which has the following successive ionization energies in kJ mol:
IE1,1314 IE2,3389 IE3,5398 IE4, 7471
IE5, 100992 IE6,13329 IE,71345 IE8,84087
a. Li
b. B
c.O
d. Ne
e. None of these
Answer:
c.O
Explanation:
From the periodic table:
Ionization energy tends to increase from IE6 → IE7 drastically at 13329 to 71345. Hence, from this process, we can infer that the removal of electrons takes place from the inner shell which in turn has a higher affinity for the nucleus. This must be oxygen because oxygen contains 6 valence electrons. The removal of this valence electron after the sixth ionization results in the achievement of a stable nearest Noble gas configuration. Hence, the rapid change in the ionization is obvious from IE6 to IE7.
Thus, the element that relates to the IE trend is oxygen.
the absolute age of a rock is approximate number of years ago that the rock formed. The absolute age of an igneous rock can best be determind by
A. measuring the amounts of radioactive isotopes in the rock
B. comparing the sizes of the crystals found in the upper and lower parts of a rock
C. examining the rock's relative position in a rock outcrop
D. observing the environment in which the rock is found
The absolute age of an igneous rock can best be determined by measuring the amounts of radioactive isotopes in the rock. Option A is correct.
Igneous rock is formed and arises as a result of the cooling and solidification of the molten magma underneath the earth surface.
Igneous rock can best be determined by measuring the amounts of radioactive isotopes present in the rock because this will be used for radiometric dating which will eventually determine the absolute age of the igneous rock.
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