Answer: im only in 6th grad sory
Explanation:
Propane reacts with elemental oxygen gas according to the unbalanced reaction, C3H8(g) + O2(g) → CO2(g) + H2O(l). What is the coefficient of the water, H2O(l), in the balanced reaction?
a
2
b
4
c
6
d
8
Answer:
b. 4
Explanation:
The reaction expression is given as:
C₃H₈ + O₂ → CO₂ + H₂O
To solve this problem, we employ a mathematical approach.
Now use coefficient a, b, c and d as the numbers that will balance the expression:
aC₃H₈ + bO₂ → cCO₂ + dH₂O
Conserving C: 3a = c
H: 8a = 2d
O: 2b = 2c + d
let a = 1, c = 3, d = 4 , b = 5
The balanced reaction expression is:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Explain how the models valence bond theory, Crystal field theory, ligand field theory and molecular orbital theory has been used to describe the formation of bonding and special properties such as spectroscopic(color), magnetic properties( diamagnetic & paramagnetic) and geometry or structures in transition metal coordination complex with possible examples supported and illustrated with figures
Answer:
i am not sure if we are talking about the same thing but here let me try.....
Explanation:
To explain the observed behavior of transition metal complexes (such as how colors arise), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It allows us to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on the nonbonding electrons on the central metal ion in coordination complexes not on the metal-ligand bonds. Like valence bond theory, CFT tells only part of the story of the behavior of complexes. However, it tells the part that valence bond theory does not. In its pure form, CFT ignores any covalent bonding between ligands and metal ions. Both the ligand and the metal are treated as infinitesimally small point charges.
All electrons are negative, so the electrons donated from the ligands will repel the electrons of the central metal. Let us consider the behavior of the electrons in the unhybridized d orbitals in an octahedral complex. The five d orbitals consist of lobe-shaped regions and are arranged in space, In an octahedral complex, the six ligands coordinate along the axes.
To explain observed behavior of transition metal complexes a model involving electrostatic interactions between electrons from ligands and the electrons in unhybridized d orbitals of central metal atom has been developed. This electrostatic model is crystal field theory (CFT).
What are transition metals?The transition metals are defined as the elements in which atoms are present whose d-sub-shell is partially filled .Due to which they give rise to cations with an incomplete d-sub-shell.
They are also defined as the elements which are present in the d-block of the periodic table, which includes groups from three to twelve.These elements are called transition elements as they show a transition between highly electro-positive group 1 and highly electro-negative group 17 elements.
They have characteristic properties due to which they can exist in variable oxidation states , form colored complexes and have catalytic properties as well.These elements are all technologically very important.
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HELP ILL MARK U AS BRAINLIEST PLSSSSS!!
Planet Average Orbital Speed
Mercury 47.87 km/s
Venus 35.02 km/s
Earth ? km/s
Mars 24.077 km/s
Jupiter 13.07 km/s
Saturn 9.69 km/s
Uranus 6.81 km/s
Neptune 5.43 km/s
The table above shows the average orbital speed of each planet. The planets are listed in order of increasing distance from the Sun, with Mercury being the nearest and Neptune the farthest.
How does the Earth compare in orbital speed to the other planets?
A.
The Earth moves faster than the planets that are farther from the Sun.
B.
The Earth moves at the same speed as all the other planets
C.
The Earth moves at a slower speed than all the other planets.
D.
The Earth moves faster than the planets that are closer to the Sun.
The Earth moves faster than the planets that are farther from the Sun.
Four molecules of solid sodium react with one molecule of oxygen gas to yield 2 molecules of solid Sodium oxide.
Answer:
reaction?
Explanation:
4na + o2 → 2na2o
Janelle hikes along the beach every morning at the same time. Throughout the month, she notices the shoreline follows a pattern of receding and advancing. What causes the shoreline to follow this pattern?
tides
water cycle
chemical weathering
erosion and deposition
Answer:
Erosion and deposition
Answer:
Tides
Explanation:
just did it:)
Are all glucose molecules chemically identical?
Answer:
starch: A soft white chemical made by all green plants. It’s a relatively long molecule made from linking together a lot of smaller, identical building blocks — all of them glucose, a simple sugar. Plants and animals use glucose as an energy source. Plants store that glucose, in the form of starch, as a reserve supply of energy.
Explanation:
7. How many joules of energy do I need to change 2 grams of water from 0°C solid water to 0° liquid water?
A. 0 joules
B. 334 joules
C. 167 joules
D. 668 joules
8. How many grams of water can I covert from a liquid to a gas with 6768 joules?
A. 334 grams
B. 3 grams
C. 1 gram
D. 2,256 grams
7. D. 668 joules
8. B. 3 grams
Further explanationGiven
2 grams of water
6768 joules of energy
Required
Energy
Mass of water
Solution
The heat to change the phase can be formulated :
Q = m.Lf (melting/freezing)
Q = m.Lv (vaporization/condensation)
Lf=latent heat of fusion
Lv=latent heat of vaporization
7. phase change (ice to water)⇒Heat of fusion water=334 J/g
Q = 2 g x 334 J/g
Q = 668 J
8. phase change(water to vapor)⇒heat of vaporization water=2260 J/g
6768 J = m x 2260 J/g
m = 3 g
Calculate the mass of 180 molecules of C3H6. The atomic masses of C and H are 12.01 amu/atom and 1.008 amu/atom respectively.
Answer:
Mass = 1257.71 ×10²³ g
Explanation:
Given data:
Number of molecules of C₃H₆ = 180 molecules
Atomic mass of C = 12.01 amu/atom
Atomic mass of H = 1.008 amu/atom
Mass of C₃H₆ = ?
Solution:
1 mole contain 6.022×10²³ molecules
180 molecules × 1 mol / 6.022×10²³ molecules
29.89×10²³ mol
Mass of C₃H₆:
Mass = number of moles × molar mass
Molar mass = 12.01×3 + 1.008×6 = 42.078 g/mol
Mass = 29.89×10²³ mol × 42.078 g/mol
Mass = 1257.71 ×10²³ g
Refer to the following unbalanced equation:
C6H14+ O2 → CO2 + H20
What mass of oxygen (O2) is required to react completely
with 25.0 g of CoH14?
Mass of Oxygen (O₂) : = 88.16 g
Further explanationGiven
Reaction(unbalanced)
C₆H₁₄+ O₂ → CO₂ + H₂0
25 g C₆H₁₄
Required
mass of oxygen (O₂)
Solution
Balanced equation
2C₆H₁₄ + 19O₂ ⇒12 CO₂ + 14 H₂O
mol C₆H₁₄ (MW=86,18 g/mol) :
= mass : MW
= 25 g : 86.18 g/mol
= 0.29
From the equation, mol ratio of C₆H₁₄ : O₂ = 2 : 19, so mol O₂ :
= 19/2 x mol C₆H₁₄
= 19/2 x 0.29
= 2.755
Mass O₂(MW=32 g/mol) :
= 2.755 x 32
= 88.16 g
If the atoms in an ionic bond are not sharing electrons, what keeps the atoms together?
Answer:
Oppositely charged particles attract each other. This attractive force is often referred to as an electrostatic force. An ionic bond is the electrostatic force that holds ions together in an ionic compound.
Explanation:
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Rank the effective nuclear charge Z* experienced by a valence electron in each of these atoms:
atom Z* experienced by a valence electron.
An atom of sodium. (pick one)
An atom of chlorine. (pick one)
An atom of silicon. (pick one)
An atom of magnesium. (pick one)
Answer:
Si > Al > Mg > Na
Explanation:
In an atom, there is the positively charged particle' the proton, the negatively charged particle; the electron and neutral charged particle; the neutron. The effect of the proton on an atom that is the ability of these positive particles to attract the negative[valence electrons] particles is known as Effective nuclear charge.
[1]. Electron configuration of Silicon, Si = (1s²2s²2p⁶) 3s²3p².
The configuration part of Si in bracket is known as the inner electrons while the ones without brackets are the outer/valence electrons.
The total number of electrons = 14, the inner electrons= 10. Thus, effective nuclear charge = 14 - 10 = 4.
[2]. Electron configuration of Aluminum, Al = (1s²2s²2p⁶) 3s²3p¹.
The configuration part of Al in bracket is known as the inner electrons while the ones without brackets are the outer/valence electrons.
The total number of electrons = 13, the inner electrons= 10. Thus, effective nuclear charge = 13 - 10 = 3.
[3]. Electron configuration of Magnesium, Mg = (1s²2s²2p⁶) 3s²
The configuration part of Mg in bracket is known as the inner electrons while the ones without brackets are the outer/valence electrons.
The total number of electrons = 12, the inner electrons= 10. Thus, effective nuclear charge = 12 - 10 = 2.
[4]. Electron configuration of sodium, Na = (1s²2s²2p⁶) 3s¹.
The configuration part of Na in bracket is known as the inner electrons while the ones without brackets are the outer/valence electrons.
The total number of electrons = 11, the inner electrons= 10. Thus, effective nuclear charge = 11 - 10 = 1.
How do the different components of the system interact? How do organisms live, grow, respond to their environment, and reproduce?`
Answer:
search it up
Explanation:
An electric circuit has an expected current of 80 amps. An electrician measures the current in the circuit at 120 amps Which statement provides a possible explanation for this observation?
There is not enough electrical energy in the circuit.
The circuit has an extra resistor
There is not enough voltage in the circuit.
A resistor in the circuit is broken
If an electric circuit has an expected current of 80 amps. An electrician measures the current in the circuit at 120 amps, the statement that provides a possible explanation for this observation is that there is not enough voltage in the circuit.
The third option is correct.
What is an electrical circuit?An electrical circuit is described as a network consisting of a closed loop, giving a return path for the current.
It is a known fact that the electrical energy in any circuit is given by the product of the current and voltage and if the current is higher than expected it means that the voltage is not enough to keep the current at the expected level.
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Answer: d
Explanation: i took the test
When air pressure rapidly falls, what weather change usually occurs?
hope this helps
Explanation:
a prolong storm will occur
that's what I found
Pollen
O sticks to the stigma
O contains female egg cells
O is produced by the pistil
is created by mitosis
Answer:
Yes! The above answer is correct.
Adding to it, your answer is option A.
Answer:
Sticks to the stigma
An actual measurement of a sample is 3.5 m. The measured
value is 2.5 m. What is the percent error in the measurement?
a 27 percent
b 29 percent
C 10 percent
d 40 percent
Answer: b 29 percent
Explanation:
Answer:
B. 29 percent
Explanation:
hope this helps
She collected 20 cm³ of oxygen. What volume of hydrogen could she also have collected at the same time?
Answer:
Assuming it was collected from the atmosphere it would be virtually nothing
Explanation:
hydrogen makes up 0.000055% of the atmosphere while oxygen makes up 23 percent. 20/400000 cm^3 of hydrogen
A small object has a mass of 82.2 grams. When completely immersed in a graduated cylinder with a water level of 25.0 mL, the object causes the water level to rise to 47.1 mL. What is the density of the object in g/mL? (Do not enter the units; only the numeric value.)
Answer:
3.72
Explanation:
Given data:
Mass of object = 82.2 g
Volume of water = 25.0 mL
Volume of water + object = 47.1 mL
Density of object = ?
Solution:
Volume of object:
Volume of object = (Volume of water + object) - Volume of water
Volume of object = 47.1 mL - 25.0 mL
Volume of object = 22.1 mL
Density of object:
d = 82.2 g/ 22.1 mL
d = 3.72 g/mL
A chemist determines by measurements that .060 moles of nitrogen gas participate in a chemical reaction. Calculate the mass of nitrogen gas that participates. Be sure your answer has the correct number of significant digits.
Answer:
1.7 g N₂
Explanation:
In order to convert moles of nitrogen gas (N₂) to grams, we'll use its molar mass:
Molar mass of N₂ = (Atomic Mass of N)*2 = (14.00 g/mol)*2 = 28.00 g/mol0.060 mol N₂ * 28.00 g/mol = 1.68 g N₂0.060 only has two significant digits, so the reported answer should have two significant digits as well. Meaning the answer is 1.7 g.
Complete the complex dimensional analysis problem to determine the price of one atom of aluminum. A 20cm x 20cm square of aluminum had a mass of 1.50g. A box of aluminum cost $1.29 and the area of foil in the box is 2.33 m^2. What is the cost of one atom of aluminum?
Answer:
$8.05
Explanation:
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) or [H⁺] = antilog (-pH)
By putting values,
[H⁺] = 10 ⁻⁶°⁴⁰
[H⁺] = 3.98×10⁻⁷ M
List the 5 characteristics of a
physical change
Answer:
A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density ( is this it )
How many atoms are in 2Ca (OH)2
Answer:
the Ans is 2
Explanation:
marks as BRAINLY
In calcium hydroxide, there are total 6 atoms are present. 2 calcium atoms, 2 oxygen atoms and 2 hydrogen atoms are present in calcium hydroxide molecule.
What is calcium hydroxide ?An inorganic substance having the chemical formula Ca(OH)2 is calcium hydroxide. It is created when quicklime is combined or slaked with water and is a colorless crystal or white powder. It goes by a variety of names, including pickled lime, hydrated lime, caustic lime, builders' lime, and slaked lime.
A white powder without any smell is calcium hydroxide. It is applied in commercial contexts such sewage treatment, paper manufacturing, building, and food processing. It can be used in dentistry and medicine. In root canal fillings, for instance, calcium hydroxide is frequently used.
Calcium oxide is converted to calcium hydroxide, sometimes known as slaked lime, or Ca(OH)2. A little percentage of it dissolves when combined with water, creating a substance known as lime water.
Thus, In calcium hydroxide, there are total 6 atoms are present.
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Which factor can help balance Earth’s temperature?
Answer:
Clouds
Explanation:
Because I just got it right
100 Points! PLZ HELP
Which statement best describes the model below?
Answer:
Option D
Explanation:
Because we know the relationship between no of moles and volume
Volume is directly proportional to no of molesSo if moles is increased volume would be increased too .Option D
How many atoms of iodine are in 12.75g of CaI2? Hint. How many Iodines are there in one CaI2 particle?
(Answer) atoms of I (4 SF)
Answer:
[tex]5.225x10^{22}atoms\ I[/tex]
Explanation:
Hello!
In this case, since 12.75 g of calcium iodide has the following number of moles (molar mass = 293.89 g/mol):
[tex]n_{CaI_2}=12.75gCaI_2*\frac{1molCaI_2}{293.89gCaI_2}=0.0434molCaI_2[/tex]
In such a way, since 1 mole of calcium iodide contains 2 moles of atoms of iodine, and one mole of atoms of iodine contains 6.022x10²³ atoms (Avogadro's number), we compute the resulting atoms as shown below:
[tex]atoms\ I=0.0434molCaI_2*\frac{2molI}{1molCaI_2} *\frac{6.022x10^{23}atoms\ I}{1molI} \\\\atoms\ I = 5.225x10^{22}atoms\ I[/tex]
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How many moles in 2.21 x10E24 atoms of aluminum
3.67 mol Al
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
2.21 × 10²⁴ atoms Al
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 2.21 \cdot 10^{24} \ atoms \ Al(\frac{1 \ mol \ Al}{6.022 \cdot 10^{23} \ atoms \ Al})[/tex]Divide: [tex]\displaystyle 3.66988 \ mol \ Al[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
3.66988 mol Al ≈ 3.67 mol Al
how is the process of neutralization reaction like the procesd of mixing white and black paints to get gray
Answer:
Acid neutralizes base to form salt and water while white colour neutralizes black colour to form grey colour.
Explanation:
Neutralization is simply the process whereby an acid and a base are mixed to produce salt and water. Now, this reaction also involves the mixing of the hydrogen ions of the acid and hydroxide ions of the base to form the salt and water. It is similar to mixing 2 paints to form another colour in that in the neutralization reaction 2 compounds are mixed to neutralize each other to form another compound while in mixing black and white to form grey the two colors are mixed together and thereby neutralized to form another colour which is grey.
An amount 10.24 kcal of heat is added to a 35.0 g sample of a liquid at 25.00°C. The final temperature is 87.35°C. What is the specific heat of the substance in cal/g°C?
Answer:
45.24
Explanation:
10.24+35=25.24
.Which statement describes the difference between incomplete dominance and codominance?
In codominance, only one allele is expressed in the offspring; In incomplete dominance, both alleles are expressed in the offspring.
In codominance, both allels are expressed in the offspring; In incomplete dominance, only one allele is expressed in the offspring.
In codominance, both alleles are expressed in the offspring; in incomplete dominance, the offspring demonstrate an intermediate form of the alleles from the parents.
In codominance, the offspring demonstrate an intermediate form of the alleles from the parents; in incomplete dominance, both alleles are expressed in the offspring.
Answer:
C Because im in 3rd grade and just did the test
Explanation:
im smart im in third grade but your doing this in college
Answer:
answer is c: In codominance, both alleles are expressed in the offspring; in incomplete dominance, the offspring demonstrate an intermediate form of the alleles from the parents.
Explanation:
