Answer:
PF3 has a trigonal pyramidal molecular geometry.
Explanation:
PF3 has four regions of electron density / electron clouds around the central P atom. The regions of electrons make a tetrahedral arrangement with a bond angle of 109.5°. Only three regions of electrons are bonding and one is non-bonding, so the overall shape is trigonal pyramidal.
The electron geometry of [tex]PF_{3}[/tex] is trigonal pyramidal.
What are the characteristics of trigonal pyramidal geometry?In chemistry, a trigonal pyramid is a molecular shape that resembles a tetrahedron and has one atom at the top and three at the corners of the base (not to be confused with the tetrahedral geometry). The molecule belongs to the point group [tex]C_{3v}[/tex] when all three of the atoms in the corners are the same. The pnictogen hydrides ([tex]XH_{3}[/tex]), xenon trioxide ([tex]XeO_{3}[/tex]), the chlorate ion, [tex]ClO^{-} _{3}[/tex], and the sulfite ion, [tex]SO^{-2} _{3}[/tex] are some molecules and ions with trigonal pyramidal structure. Trigonal pyramidal-shaped molecules are sometimes referred to as sp3 hybridized in organic chemistry.Trigonal pyramidal is a molecular shape formed when three bonds and one lone pair exist on the central atom of the molecule. Sp3 hybridization occurs at the central atom of molecules with tetrahedral electron pair geometries. Ammonia (NH3) is a pyramidal trigonal molecule.To learn more about trigonal pyramidal geometry, refer to
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3. Which of the following is the correct notation for an isotope with 3 protons and 5 neutrons?
A. 5/3Li
B. 3/5B
C. 8/3 Li
D. 8/5 B
Answer:
option c
Explanation:
neutros equal to mass num - atomic num
An atom can be defined by its properties:
Atomic number (Z): It is equal to the number of protons present in a neutral atom.Mass number (A): It is equal to the sum of the number of protons and the number of neutrons.An isotope is represented by the general notation of [tex]_Z^A\textrm{Y}[/tex], where X is the symbol of an element.
Mass number = Numer of protons + Number of neutrons
Put the value in the above formula.
[tex]\Rightarrow \text{Mass number}=3+5[/tex]
[tex]\Rightarrow \text{Mass number}=8[/tex]
The isotopic representation of the chemical specie is [tex]_3^8\textrm{Li}[/tex]. So, the correct option is C.
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How many moles of hydrogen atoms are there in 1.25 x 1025 molecules of ethane? (C2H6)
Answer:
124.56 moles of Hydrogen atoms.
Explanation:
We'll begin by calculating the number of moles of ethane that contains 1.25×10²⁵ molecules. This can be obtained as follow:
From Avogadro's hypothesis, 1 mole of any substance contains 6.02x10²³ molecules. This implies that 1 mole of ethane also contains 6.02x10²³ molecules.
Thus, 6.02x10²³ molecules are present in 1 mole of ethane.
Therefore, 1.25×10²⁵ molecules are present in = 1.25×10²⁵/6.02x10²³ = 20.76
Therefore, 20.76 moles of ethane contains 1.25×10²⁵ molecules.
Finally, we shall determine the number of mole of Hydrogen in 20.76 moles of ethane. This can be obtained as follow:
Ethane has formula as C2H6.
From the formula, 1 mole of ethane, C2H6 contains 6 moles of Hydrogen atoms.
Therefore, 20.76 moles of ethane will contain = 20.76 × 6 = 124.56 moles of Hydrogen atoms.
Therefore, 1.25×10²⁵ molecules of ethane contains 124.56 moles of Hydrogen atoms.
What would be the result of adding one proton to an atom
Answer:
Protons carry a positive electrical charge and they alone determine the charge of the nucleus. Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium.
i hope this helps!
Does the shape of molecule matter?
Which will have both the highest ionization energy and the largest atomic
radius? Potassium, Bromine, Krypton
Answer:
Bromine
Explanation:
Cuz it has bro in it :)
Which force keeps planets in orbit around the Sun?
O A. Strong nuclear force
O B. Electric force
O C. Gravity
O D. Magnetic force
Answer: Gravity
Explanation:
A PE X
Calculate the number of moles in 144 g of P.
What volume of hydrogen is formed when 3.00 g of
magnesium react with an excess of dilute sulfuric acid is
carried out under room temperature and pressure at 1 atm.
Answer:
Volume of hydrogen gas formed = 3.1 L
Explanation:
Given data:
Mass of magnesium = 3.00 g
Temperature = room = 27°C (27+273 = 300 K)
Pressure = 1 atm
Volume of hydrogen gas formed = ?
Solution:
Chemical equation:
Mg + H₂SO₄ → MgSO₄ + H₂
Number of moles of Mg:
Number of moles = mass/molar mass
Number of moles = 3.00 g/ 24 g/mol
Number of moles = 0.125 mol
Now we will compare the moles Mg with hydrogen.
Mg : H₂
1 : 1
0.125 : 0.125
Volume of hydrogen:
PV = nRT
1 atm × V = 0.125 mol × 0.0821 atm.L /K.mol × 300 k
V = 3.1atm.L/1 atm
V = 3.1 L
Find the volume of an object with a density of 12.8 g/mL and a mass
of 123 g
Answer:
The answer is 9.60 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 123 g
density = 12.8 g/mL
We have
[tex]volume = \frac{123}{12.8} \\ = 9.609375...[/tex]
We have the final answer as
9.60 mLHope this helps you
what does atom mean?
Answer:
Atoms consist of a nucleus made of protons and neutrons orbited by electrons. Atoms are the basic units of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided
Explanation:
52° 31' 12.0288"N and 13° 24' 17.8344" E.
What continent is it on?
Answer: Europe
Explanation: it’s in germany
13.Surface tension is a property of
A. liquids, only
B. solids, only
С.gases and solids
D.gases and liquids
Answer:
I think it is liquid's only.
Explanation:
Answer:
Liquids only i am not sure but i think its A
A
is an organism that eats other organisms to gain energy; it is also called
Answer:
A consumer
Explanation:
Organisms, such as plants, that produce their own food by methods such as photosynthesis are called producers.
Organisms that need to consume other organisms as their food source, including all animals, are consumers. Some consumers consume plants (primary consumers, or herbivores) but other consumers eat other consumers (secondary consumers, or carnivores)
How is a sand bar formed?
Answer:
Matter is classified into two broad categories, namely, pure substances and mixtures. Mixtures can be separated into pure substances by physical methods. Pure substances are further divided into categories as elements and compounds. ... A pure substance can be either an element or a compound.
Explanation:
What is the density of a 30 g solid with a volume of 20 cm^3?
Answer:11.35 g/cm 3
Explanation:
Length
= 2.0 dm = 20 cm
Breadth
= 8.0 cm
Height
= 35 mm = 3.5 cm
Volume of block
V = ℓ ⋅ b ⋅ h = 20 cm × 8.0 cm × 3.5 cm = 560 cm
3
Density of lead is
Density
=
Mass
Volume
=
6356 g
560 cm
3
=
11.35 g/cm
3
Explanation:
q=mcΔT. Given this equation find the change in temperature. q = 600 J, m= 25.0 g, c= 0.897 J/g°C. What is ΔT?
Answer:
Change in temperature = ΔT = 26.8°C
Explanation:
Given data:
Heat absorbed = 600 j
Mass = 25.0 g
Specific heat capacity = 0.897j /g°C
Change in temperature = ΔT= ?
Solution:
Formula:
q = mcΔT
600 j = 25.0 g ×0.897 j/g°C×ΔT
600 j = 22.425 j/°C×ΔT
ΔT = 600 j /22.425 j/°C
ΔT = 26.8°C
Which scientist proposed the idea of the 'nucleus' after the unexpected results of his students’ gold foil experiment?
Group of answer choices
Democritus
Dalton
Bohr
Rutherford
Answer:
D
Explanation:
The nucleus was postulated as small and dense to account for the scattering of alpha particles from thin gold foil, as observed in a series of experiments performed by undergraduate Ernest Marsden under the direction of Rutherford and German physicist Hans Geiger in 1909.
50 POINTS PLEASE HELP!!
What was the volume of air that has a volume of 6.00L at 120870 Pa, if the original pressure was 250020 Pa?
Answer:
120876
Explanation:
Balance the equation Al 2 O 3 + Cl 2 + C ----> AlCl 3 + CO
Answer:
Al2O3 + 3Cl2 + 3 C → 2 AlCl3 + 3 CO
Explanation:
A crest of a wave with an amplitude of 5 meters intersects the through of another wave with an amplitude of 2 meters. What is the resulting amplitude?:
A. 3 meters
B. 5 meters
C. 7 meters
D. 2 meters
A crest of a wave with an amplitude of 5 meters intersects the through of another wave with an amplitude of 2 metre . the resulting amplitude is
A. 3 meters
The resultant amplitude will be 7 meters.
We have crests of two different waves.
We have to find the resulting amplitude when both the waves intersect.
What is crest of a wave ?A crest point on a wave is the maximum value of upward displacement within a cycle.
According to the question -
Amplitude of wave 1 = 5 meters.
Amplitude of wave 2 = 2 meters.
Assuming that both waves are in phase, when the two waves which are
in-phase interfere, they interfere constructively. The final amplitude will be -
A(f) = A[1] + A[2] = 5 + 2 = 7 meters.
Hence, the resultant amplitude will be 7 meters.
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For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny silver colored strip of zinc metal in the solution and observed the changes, The student inferred that a chemical reaction occurred. What evidence supports this inference?
Answer:
It is the second answer; A dark solid formed on the zinc.
Explanation:
This is the correct answer because when a solid is formed it is called a precipitate, which is commonly known as a chemical reaction.
The evidence that supports the student's inference is a dark solid formed on the zinc.
Chemical reaction of zinc metal with CuSO4When zinc is added to copper sulphate (CuSO4) solution, due to more reactivity of zinc, copper is replaced by zinc and forms zinc sulphate precipate.
Thus, the student is correct, there will be a chemical reatcion between the zinc and copper sulphate (CuSO4) solution, producing a dark solid substance.
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The two most common isotopes of argon (Ar) are argon-36 and argon-40. Given that the average atomic mass is 39.95, what can be said about the relative abundance of each isotope? Which is more common and how do you know? No calculation is necessary. I am looking for a simple written response.
Answer:
Argon-40
the reason this is abundent is because this is a more common isotope
Explanation:
How many particles are in 3.4 moles of NaCl?
Answer:
The answer is
2.049 × 10²⁴ particlesExplanation:
To find the number of entities or particles given the number of moles of a substance we use the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 3.4 mol
We have
N = 3.4 × 6.02 × 10²³
We have the final answer as
2.049 × 10²⁴ particlesHope this helps you
Calculate the mass of aluminum that would have the same number of atoms as 6.35 g of cadmium
Answer:
1.62 g of Al contain the same number of atoms as 6.35 g of cadmium have.
Explanation:
Given data:
mass of cadmium = 6.35 g
Number of atoms of aluminum as 6.35 g cadmium contain = ?
Solution:
Number of moles of cadmium = 6.35 g/ 112.4 g/mol
Number of moles of cadmium = 0.06 mol
Number of atoms of cadmium:
1 mole = 6.022×10²³ atoms of cadmium
0.06 mol × 6.022×10²³ atoms of cadmium/ 1mol
0.36×10²³ atoms of cadmium
Number of atoms of Al:
Number of atoms of Al = 0.36×10²³ atoms
1 mole = 6.022×10²³ atoms
0.36×10²³ atoms × 1 mol /6.022×10²³ atoms
0.06 moles
Mass of aluminum:
Number of moles = mass/molar mass
0.06 mol = m/ 27 g/mol
m = 0.06 mol ×27 g/mol
m = 1.62 g
Thus, 1.62 g of Al contain the same number of atoms as 6.35 g of cadmium have.
Which of the following shows the abbreviation for an Sl unit of density?
A. L/kg
B. g/mL
C.
g/cm
D. kg/m2
Explanation:
ur answer okkkkkkkkkkkkkkkkll
How many mL of 2M stock solution would I use to prepare 0.500 L of 0.1 M NaCl?
Answer:
25 mL
Explanation:
Step 1: Given data
Concentration of the concentrated solution (C₁): 2 MVolume of the concentrated solution (V₁): ?Concentration of the diluted solution (C₂): 0.1 MVolume of the diluted solution (V₂): 0.500 LStep 2: Calculate the volume of the concentrated NaCl solution
We will use the dilution rule.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂ / C₁
V₁ = 0.1 M × 0.500 L / 2 M
V₁ = 0.025 L = 25 mL
Which of these does not accurately describe the Wright brothers' first
airplane?
A. It had wings that flapped,similar to birds wings
B.it had powerful yet exceptionally lightweight engines
C.it was created after various designs were tested in a wind tunnel
D.it was created using the engineering process
Answer: A
Explanation:
it had wings that flapped, similar to birds' wings.
3.7500*10^4+9.7100*5
Answer:
37548.55
Explanation:
3.7500*10^4+9.7100*5
3.7500*10000+9.7100*5
37500+48.55
37548.55
Consider the following balanced chemical equation representing the combustion of propane gas:
C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)
The data from an experiment showed that 16.3 grams of carbon dioxide were produced. How many moles of water were expected as product? Report your answer with 3 SFs. Do NOT enter units on the final answer.
______________________ moles of H2O
Answer:
We are given the following equation:
C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)
we can see that the number of moles of H2O is 4/3 time the moles of CO2
So, the easiest way to find the number of moles of H2O is to find the number of moles of CO2 and multiply it by 4 / 3
Moles of CO2:
Molar mass of CO2 = 44 grams / mol
Moles of CO2 = Given mass / Molar mass
Moles of CO2 = 16.3 / 44 moles
Moles of H2O:
Moles of H2O = Moles of CO2 * 4 / 3
Moles of H2O = 16.3 * 4 / 3 * 44
Moles of H2O = 16.3 / 3 * 11
Moles of H2O = 16.3 / 33
Moles of H2O = 0.5 moles (approx)
Therefore, along with 16.3 grams of CO2, 0.5 moles of H2O will also be formed
A homogeneous mixture is:
A. composed of only one type of element.
B. composed of different parts that are indistinguishable in their color, texture, or appearance.
C. composed of different parts that are distinguishable in their color, texture, or appearance.
D. composed of atoms bonded together.
Answer: A homogeneous mixture is a solid, liquid or gaseous mixture that has the same proportions of its components throughout any given sample.
Explanation:
A homogeneous mixture is composed of different parts that are indistinguishable in their color, texture, or appearance.
What is the difference between homogenous and heterogeneous mixtures?
The extent of the elements' mixing together and the uniformity of their composition distinguish heterogeneous mixtures from homogeneous ones.
Homogenous mixtureWhen the elements that make up a combination are evenly distributed throughout the mixture, the mixture is said to be homogenous. The combination has a constant composition throughout. In a homogeneous mixture, only one phase of matter is visible at any given time. In a homogenous mixture, you would not see a liquid and a gas or a liquid and a solid.Examples: air, sugar water, steel, etc.Heterogeneous mixtureA heterogeneous mixture is one in which the constituent parts are not uniform or have discrete areas with various qualities. The various samples from the mixture differ from one another. In a heterogeneous mixture, even though two or more regions have the same state of matter, you can always distinguish between them by looking at their unique qualities.Examples: Cereal in milk, vegetable soup, blood, etc.Learn more about homogenous and heterogeneous mixtures here:
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