Answer:
Potassium nitrate is a chemical compound with the chemical formula KNO3. It is an ionic salt of potassium ions K+ and nitrate ions NO3−, and is therefore an alkali metal nitrate. It occurs in nature as a mineral, niter (or nitre in the UK). It is a source of nitrogen, and nitrogen was named after niter.
Explanation:
Find the number of grams in 3.45 x 10^21 molecules NiO
Answer:
Mass = 0.43 g
Explanation:
Given data:
Mass in gram = ?
Number of molecules of NiO = 3.45×10²¹
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
3.45×10²¹ molecules × 1 mol / 6.022 × 10²³ molecules
0.57×10⁻² mol
0.0057 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.0057 mol × 74.69 g/mol
Mass = 0.43 g
In a sample of air at STP, the partial pressure of nitrogen gas is PN, = 0.78 atm and the partial
pressure of argon gas is Par = 0:01 atm. Calculate the partial pressure of oxygen gas Po, at STP.
Ignore units and use the proper amount of significant figures.
Answer:
0.21 atm
Explanation:
Step 1: Given data
Pressure of air (P): 1 atm (standard pressure)Partial pressure of nitrogen (pN₂): 0.78 atmPartial pressure of argon (pAr): 0.01 atmStep 2: Calculate the partial pressure of oxygen
The air is a gaseous mixture formed mainly by nitrogen, oxygen and argon. The total pressure is equal to the sum of the partial pressures of the gases.
P = pN₂ + pAr + pO₂
pO₂ = P - pN₂ - pAr
pO₂ = 1 atm - 0.78 atm - 0.01 atm
pO₂ = 0.21 atm
72.40% iron,27.60% Oxygen Empirical formula
Explanation:
Fe. O
72.40/ 56 27.60/16
____________________
1.29/1.29 1.725/1.29
_____________________
1. :. 1
Emperical formula = FeO
Empirical formula is the whole number ratios of elements in a compound. It can be found from the number of moles. The empirical formula of iron and oxygen of 72.4 % and 27.6 % respectively is Fe₂O₃.
What is empirical formula?Empirical formula of a compound is the chemical formula derived from the number of moles each element present in it. Whereas, molecular formula is derived from the actual masses of the elements present in the compound.
Empirical formula can be determined from the number of moles of the elements. It is given that the mass percentages of iron and oxygen are 72.40% and 27.60% respectively. This can be taken as 72.40 g and 27.60 g in a 100 g of compound.
Thus there is 72.40 g of iron. The atomic mass of Fe = 55.85 g/mol
Thus number of moles of Fe = 72.40 / 55.85
= 1.295
The weight of oxygen in 100 g of compound is 27.60 g. Atomic mass of oxygen is 16 g/mol.
Thus number of moles of oxygen = 27.60 /16 = 1.725
Taking the ratios of these number of moles = 1.295 :1.725 = 2 :3
Hence, the ratios of iron to oxygen is 2:3 which means the empirical formula of the compound is Fe₂O₃.
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Chemistry
Definition in your own words
Will check if you got it from online.
Word: Solid
Answer:
A solid is a matter that has particles that are closely packed which as a result makes it vibrate but not flow.
Q2. Which of the following molecules may show.
Infra-red absorption
absorption Spectra, CH3CH3,
CH₃Cl3, N2.
Answer:
I think is answer
CH3cl3
Is the cell wall factory part or worker? And please explain what the worker or factory part does. (Don’t tell me it’s on quizlet bc I can’t find it)
The electron structure of atoms in elements A and C are 2, 8, 1 and 2, 8, 18, 7, respectively. The formula for the compound formed between A and C will be AC. True or false? pls help me T^T
John rode his bike down the street to the east. He rode 100 meters in 25
seconds. What was his velocity?
A. 0.25 m/s east
B. 25 m/s east
C. 10 m/s east
D. 4 m/s east
Answer:
The answer is D.
Explanation:
Given that velocity also applies speed formula, S = D ÷ T where D represents distance and T is time :
S = D ÷ T
S = 100m ÷ 25s
S = 4m/s
V = 4m/s east
The difference between speed and velocity is that speed has only magnitude but velocity has magnitude and direction.
2. How many moles are in 2.43 x 1024 particles of Carbon Monoxide
(CO)?
Answer:
= 14.63 × [tex]10^{45}[/tex] particles.
Explanation:
According to Avogadro's priciple:
1 mole of any substance is 6.02 × [tex]10^{23}[/tex] particles
∴ 2.43 x [tex]10^{24}[/tex] moles × 6.02 × [tex]10^{23}[/tex]
= 14.63 × [tex]10^{45}[/tex] particles.
I hope this was clear and easy to understand.
what happens when copper sulphate reacts with hydrogen
sulphide?
Answer:
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. In this reaction, cupric ions (from copper sulphate) combine with sulphide ions (from hydrogen sulfide) to form cupric sulphide.
Answer:
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. In this reaction, cupric ions (from copper sulphate) combine with sulphide ions (from hydrogen sulfide) to form cupric sulphide.
Explanation:
please help. calculate the partial pressure of oxygen gas Po2 at STP.
Answer:
0.21 atm
Explanation:
From the question given above, the following data were obtained:
Partial pressure of N₂ (P₁) = 0.78 atm
Partial pressure of Ar (P₂) = 0.01 atm
Partial pressure of O₂ (P₃) =?
Since the system is at standard temperature and pressure (STP), the total pressure of the system is 1 atm.
Finally, we shall determine the partial pressure of O₂. This can be obtained as follow:
Partial pressure of N₂ (P₁) = 0.78 atm
Partial pressure of Ar (P₂) = 0.01 atm
Total pressure (Pₜ) = 1 atm
Partial pressure of O₂ (P₃) =?
Pₜ = P₁ + P₂ + P₃
1 = 0.78 + 0.01 + P₃
1 = 0.79 + P₃
Collect like terms
1 – 0.79 = P₃
P₃ = 0.21 atm
Therefore, the partial pressure of O₂ is 0.21 atm.
Examine the chemical reaction and lab scenario.
2Fe2S3+9O2→2Fe2O3+6SO2
3.17 g of iron(III) sulfide (Fe2S3) reacts with an excess amount of oxygen at standard temperature and pressure. The theoretical yield of sulfur dioxide (SO2) is 3.81 g. However, during a lab, only 3.37 g are produced.
What is the percent yield of sulfur dioxide?
94.41% SO2
81.36% SO2
44.00% SO2
88.45% SO2
Explanation:
Percentage Yield
= (3.37g/3.81g) * 100% = 88.45%.
Therefore 88.45% SO2 is the percentage yield.
describe how atomic emission Spectra give us information about the energy levels of electrons in atoms
Answer:
Energy of atom is in lowest. The energy of electrons are given energy. The electrons absorb energy. Its converted to higher level of energy.
When excited electrons return to their ground state, atomic emission spectra are produced. When electrons return to a lower energy level, they emit light energy.
What is atomic emission Spectra?The emission spectrum of a chemical element or chemical compound is the spectrum of electromagnetic radiation frequencies emitted as a result of an electron transitioning from a high energy state to a lower energy state.
The emitted photon's photon energy equals the energy difference between the two states.
Atomic emission spectra provided further evidence of light's quantized nature, leading to the development of a new model of the atom based on quantum theory.
When excited electrons return to their ground state, atomic emission spectra are produced. The light emitted corresponds to the energies of the specific electrons.
Thus, this way atomic emission Spectra give us information about the energy levels of electrons in atoms .
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A plant takes root in a small crevice of rock, as the plant grows, its roots push on the edges of the rock, breaking it is a form of weathering?
1. True
2. False
How will you process the information in the table and on the map to
make predictions? Describe how you will use the inputs to develop
an output.
Help
Answer:
By measuring through scale
Explanation:
CAN YOU TELL THE NAME OF COUNTRY BECAUSE I AM FROM NEPAL
Comparin
List three characteristics of chemical reactions
and three characteristics of nuclear reactions.
DONE
Answer:
Chemical reactions involve the loss, gain, or sharing of electrons, but do not involve changes to the nucleus of an atom. Nuclear reactions involve changes to the nucleus and produce a new particle. Chemical reactions involve low energy changes. Chemical reactions never involve a change in the mass of atoms.
List three characteristics of chemical reactions, I have five:
occur when bonds are broken and formed
atoms remain unchanged though they may be rearranged
involve only valence electrons
reaction rate is influenced by, temp, pressure, concentration, and catalyst
Three characteristics of nuclear reactions, I have five:
occur when nuclei emit particles
atoms are often converted into atoms of another element
may involve protons, neutrons, and electrons
reaction rate is not normally affected by temp, pressure or catalyst
A simplified version of the Periodic Table of the Elements is provided. What type of elements would you most likely find in the circles portion?
Answer:
Transition elements are present in this region.
Explanation:
why is water a polar covalent molecule.
Water is a Polar Covalent Molecule
The unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule means that a water molecule has two poles - a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole (side).
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Is the following equation balanced?...
Al + O2 --> 2Al2O3
Answer:
no
Explanation:
What is produced when an acid and an alkali react?
A. Water and a base
B. Water and Carbon dioxide
C. Salt and a base
D. Salt and water
if a bike travels 23m at constant speed 5289s what is the bikes speed?
Answer:
0.004 m/s
Explanation:
Given data:
Distance traveled = 23 m
Time taken = 5289 s
Speed of bike = ?
Solution:
Formula:
speed = distance / time
b y putting values,
speed = 23 m/ 5289 s
speed = 0.004 m/s
five more than one third of a number is nine .
Answer:
uh
Explanation:
5+x/3=9
=x/3=9-5
=x=12
calculate the percentage of calcium in calcium chlorate
Answer:
19.4%
Explanation:
Calcium Chlorate is Ca(ClO3)2
Now calculate the molar mass of Ca(ClO3)2
Ca = 40.1
Cl = 35.5
O = 16.0
But they are two chlorine atoms and six oxygen atoms. So you do this:
40.1 + 35.5(2) + 16.0(6) = 207.1 grams
Now find the molar mass of just calcium.
There is only one calcium atom.
So you do this.
40.1(1) = 40.1
Now divide the molar mass of calcium by the molar mass of calcium chlorate.
40.1 / 207.1 = 0.1936
0.1936 rounds to 0.194
Now multiply 0.194 * 100 and you will get 19.4
So the final answer is 19.4%.
Hope it helped!
Why is the atomic model the foundation for chemistry?
A. because all matter is made of atoms
B. because no particle is smaller than the atom
O c. because atoms are the invisible particles that make up light
O D. because atoms are the small forces of energy that hold together all matter
Answer:
A.
Explanation:
Identify the metals in period 3 on the periodic table
Answer:
Aluminum (Al) is the only metal in period 3 on the periodic table.
true or false
1. Average atomic mass is the mass of any atom based on its nuclear particles in relation to units measured in amu which is 1/12th of a carbon atom.
2. When calculating the average atomic mass of an element, the average atomic mass value falls closest to that of the least percentage abundance (least common) isotope.
Answer:
true
Explanation:
calculating the average atomic
Lee rode a skateboard to school. His velocity changed from 2 m/s east to 5
m/s east in 6 seconds. What was the change in Lee's velocity?
A. 5 m/s east
B. 3 m/s east
C. -3 m/s east
D. 2 m/s east
Answer:
Option B. 3 m/s east
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 2 m/s east
Final velocity (v) = 5 m/s east
Time (t) = 6 s
Change in velocity =?
We can obtain the change in Lee's velocity as illustrated below:
Initial velocity (u) = 2 m/s east
Final velocity (v) = 5 m/s east
Change in velocity =?
Change in velocity = Final velocity (v) – Initial velocity (u)
Change in velocity = v – u
Change in velocity = 5 – 2
Change in velocity = 3 m/s east
Thus, the change in Lee's velocity is 3 m/s east
Answer:
Option (B.) 3 m/s east
Explanation:
Have a good day hope it helps
What is the name of a molecule which is composed of two
phosphorous atoms and four sulfur atoms?
The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.
What is molecule ?According on the context, the word may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms bound together by attractive forces known as chemical bonds.
A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical characteristics. Further atom division occurs within molecules. For instance, the symbols for the oxygen atom and molecule are O and O2, respectively.
Thus, The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.
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Please select the word from the list that best fits the definition How far something moves in a specific amount of time
Answer:
Speed
Explanation:
That is what I believe the word to the definition, How far something moves in a specific amount of time, but you'd have to providea picture of the list of words for me to be sure...
A force that does not have a high amount of effect
Answer:
yes
Explanation:
its not that hard to get