Answer:
It is known that 1 mol of a molecule contains 6.023×1023 6.023 × 10 23 number of molecules. So, 0.25 moles of CO2 C O 2.
The correct option for the given question about Mole Concept is Na / 2 atom of oxygen.
What is mole?In chemistry, a mole is a unit. A mole of a substance is the mass of the substance containing precisely 12 gram of the same number of atoms as 12C.The mole is the SI unit used to measure a substance's quantity. It has the symbol mol.
How to solve this question?
In 1 mole number of molecules of CO₂ = Na (Avagadro Number)
In 0.25 mole number of molecules of CO₂ = 0.25 × Na molecules
In 1 molecule number of oxygen atom = 2 atom
In 0.25 × Na molecules number of oxygen atom = 2 × 0.25 × Na atom
In 0.25 × Na molecules number of oxygen atom = 0.5 × Na atom
So in 0.25 mole of CO₂ number of oxygen atom = Na / 2 atom
Thus we can conclude that in 0.25 mole of CO₂ number of oxygen atom will be Na / 2, where Na is Avagadro Number.
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The frequency light of 3.52*10-7
Answer:
The speed of light, c, equals the wavelength, λ (pronounced lambda), times the frequency, ν, (pronounced noo).
c=λν
c is a constant. It is usually given as 3.00×108 m/s or 3.00×1010 cm/s rounded to three significant figures.❤
Which type of energy uses the photoelectric effect?
Biomass
Solar
Geothermal
Wind
Answer:
My lovely people the answer is SOLAR
Explanation:
i just know
The type of energy that uses the photoelectric effect is solar energy. Therefore, the correct option is option B.
When light strikes a material surface, the photoelectric effect takes place, which results in the emission of electrons. Albert Einstein made this intriguing discovery in 1905, and it was essential in the development of quantum physics and our comprehension of the nature of light. The fundamental principle underlying the photoelectric effect is that light is made up of small energy packets known as photons. A photon's energy can be transferred to an electron in a solid or atom when it interacts with those structures. The type of energy that uses the photoelectric effect is solar energy.
Therefore, the correct option is option B.
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If 9 moles of P203 are formed, how many
moles of O2 reacted?
6. The valence number of a metallic element x is 3. What is the chemical formula of its B. Nitride?
What are the two elements sand is made of? *
Answer:
tiny crystals of the mineral quartz, which is made out of silica and oxygen
Well, much of the world's sand is made out of the same stuff, tiny crystals of the mineral quartz, which is made out of silica and oxygen, the two most common elements in Earth's crust.
I NEED HELP ASAP !!!!
Answer:
5)A &D 6)B
Explanation:
Mass of Fe is 55.845 u
Mass of Cl is 35.453 u
And their sum is 91.298 u
Octane has a density of 0.703 g/ml. Calculate the mass of CO2(g) produced by burning one
gallon of octane. There are 3.79 liters to one gallon.
The mass of CO₂ gas produced during the combustion of one gallon of octane is 8.21 kg.
The given parameters:
Density of the octane, ρ = 0.703 g/mlVolume of octane, v = 3.79 litersThe mass of the octane burnt is calculated as follows;
[tex]m = \rho V\\\\m = 0.703 \ \frac{g}{ml} \times 3.79 \ L \ \frac{1000 \ ml}{L} \\\\m = 2,664.37 \ g[/tex]
The combustion reaction of octane is given as;
[tex]2C_8H_{18} + \ 25O_2 \ --> \ 16CO_2 \ + \ 18H_2O[/tex]
From the reaction above:
228.46 g of octane -------------------> 704 g of CO₂ gas
2,664.37 of octane --------------------> ? of CO₂ gas
[tex]= \frac{2,664.37 \times 704}{228.46} \\\\= 8,210.3 \ g\\\\= 8.21 \ kg[/tex]
Thus, the mass of CO₂ gas produced during the combustion of one gallon of octane is 8.21 kg.
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What can a scientist use to observe very small things?
1. A good pair of glasses
2. Tools and technology
3. The five senses
4. Sense of touch
Answer:
2
Explanation:
depends on how small but you wouldn't be able to see with good glasses your senses or your touch
Answer:
Tools and Technology ( Microscopes etc)
Explanation:
Glasses are not good enough to see on the molecular and cellular level.
The five senses aren't reliable and can vary between people.
Touch is one of the 5 senses, and touching chemicals isn't good.
What is the molarity of a NaOH solution when 22.14 mL of 0.105 M oxalic acid is needed to
neutralize 25.0 mL of the base.
The molarity of the NaOH solution required for the reaction is 0.186 M
We'll begin by writing the balanced equation for the reaction
H₂C₂O₄ +2NaOH —> Na₂C₂O₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂C₂O₄ (nA) = 1
The mole ratio of the base, NaOH (nB) = 2
From the question given above, the following data were obtained:
Volume of the acid, H₂C₂O₄ (Va) = 22.14 mL
Molarity of the acid, H₂C₂O₄ (Ma) = 0.105 M
Volume of the base, NaOH (Vb) = 25 mL
Molarity of the base, NaOH (Mb) =?MaVa / MbVb = nA/nB
(0.105 × 22.14) / (Mb × 25) = 1/2
2.3247 / (Mb × 25) = 1/2
Cross multiply
Mb × 25 = 2.3247 × 2
Mb × 25 = 4.6494
Divide both side by 25
Mb = 4.6494 / 25
Mb = 0.186 MTherefore, the molarity of the base, NaOH solution is 0.186 M
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What is the percentage of nitrogen in ammonium chloride (NH4Cl)?
Answer:
25%
Explanation:
Ammonium Chloride NH4CI Fertilizer-grade NH4Cl usually contains 25% N. About two-thirds of the world capacity for manufacture of this material is located in Japan, with the remaining one-third situated in India and China.
Give reason. When the tip of a plant is cut, it does not grow tall.
Answer: The growth of the plant decides on the presence of plant hormone, auxin which develops in the roots and shoots. Auxins change the rate of elongation in plant cells, controlling how long they become. So, if the tips are removed, there is no auxin made and growth of the plant stops.
List the four quantum numbers
Answer: In atoms, there are a total of four quantum numbers: the principal quantum number (n), the orbital angular momentum quantum number (l), the magnetic quantum number (ml), and the electron spin quantum number (ms).
Answer:
(n)
(i)
(mı)
(ms) s is suppose to be smaller than the m
Explanation:
the principal quantum number (n)
the orbital angular momentum quantum number (I)
the magnetic quantum number (ml)
the electronic spin quantum number (ms)
Which element represents magnetic properties?
Answer:Demagnetizing a magnet is also possible. Only a few substances are ferromagnetic; the most common ones are iron, cobalt and nickel and their alloys. The rare-earth metals neodymium and samarium are less common examples.
Explanation;
milk is heterogeneous mixture why
Answer:
Milk is essentially a colloidal dispersion of fat in water. ... However, the fact remains that the fat and water components cannot be mixed together from a solution. There are therefore, two distinct immiscible liquid phase's present, which is why it is a heterogeneous mixture.
11) What volume will 0.75 mol of Oxygen gas (O2) occupy at 298 K and a pressure of 52.7 kPa?
Answer:
Volume = 35.3L
Explanation:
Use Ideal Gas Law (PV=nRT) and isolate for V (volume) by dividing both sides by P (pressure). You will then get the eqaution listed below and you can solve by using the method I used below.
V = nRT/P
V = (0.75kPa)(8.314)(298K)/(52.7kPa)
V = 1858.179/52.7
V = 35.3L
If the vapor pressure of water at 20.0 o C is 17.535 torr, and the atmospheric pressure measured by a barometer was 757.3 torr, what is the partial pressure of H2 in the gas mixture in a buret
Answer:
f the vapor pressure of water at 20.0 o C is 17.535 torr, and the atmospheric pressure measured by a barometer was 757.3 torr, what is the partial pressure of H2 in the gas mixture
Partial pressure of H2 in gas mixture is :
739.765 torr .
Explain total pressure?The overall pressure ptot is the total of all pressures in a reference system. This pressure, according to Bernoulli (see Fluid mechanics), consists of the static pressure p, the dynamic pressure pdyn, and the geodetic component ( g z) that exists in a fluid along a stream line in a frictionless flow.The total pressure of a gas mixture is the sum of its component gases' partial pressures: Ptot = ∑Pi = P1 + P2 + P3... ntot = total number of moles in the gas mixture (the sum of all ni).Total pressure of mixture =
Partial of hydrogen + Partial pressure of oxygen
Partial of Hydrogen = Total pressure - partial pressure of oxygen
Here total pressure = 757.3 torr
Partial pressure of oxygen = 17 . 535 torr
Total pressure = 757 . 3 - 17 . 533
= 739.765 torr.
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Determine the frequency of light with a wavelength of 2.672 x 10^-7cm
Answer:
Determine the frequency of light with a wavelength of 2.775⋅10−7 cm. Answer in units of Hz?❤
Draw and Name the Cis- isomer for the following compound:
CH3 - CH = CH - CH2 - CH3
Answer:
Cis-2-pentene or Z-2-pentene
What types of orbitals are found in the third energy level?
Answer:
1 s-orbital, 3 p-orbital and 5 d-orbital
Answer:
there are a total of nine orbitals in a third energy level
Explanation:
Which example accurately describes a solution? (1 point)
Nonpolar oil molecules dissolve in water, which is polar.
Polar sugar molecules dissolve in water, which is polar.
Nonpolar fat molecules dissolve in water, which is polar.
Polar sugar molecules dissolve in oil, which is nonpolar.
The example which accurately describes a solution is; Polar sugar molecules dissolve in water, which is polar.
According to the question:
We are required to determine Which example accurately describes a solution.The formation of a solution requires that the solvent and solute be of the same polarity.
In essence, the example which accurately describes a solution is; Polar sugar molecules dissolve in water, which is polar.
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Answer:
Polar sugar molecules dissolve in water, which is polar.
Explanation:
I did the Exam and got it right!
Which of the following is not part of an amino acid?
A. ammonium group
B. carboxylate group
C. ether group
D. unique "R" group
Answer:
C
Explanation:
Ether group does not exist in amino acids
Ammonium group is on one side
the carboxylate group is opposite to the ammonium group
the R group defines what amino acid it is.
using the formula F=ma, what force is required to accelerate a car weighing 642 kg at 13 m/s2
REALLY NEED HELP RN
HELP ME ?
PLEASE!??
Answer:
8,346 kmxm/s2
Explanation:
this is physics not chem but you just multiply 13 by 642 to get 8,346. also I'm sorry but it's easy
Of the following, ________ is the most volatile. Select one: C2F6 C2H6 C2I6 C2Cl6 C2Br6
Answer:
C2Br6
because bromine is a liquid volatile
According to the forces of attraction and boiling point C₂Br₆ is most volatile as its boiling point is very low.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Which functional group does the molecule below have?
Answer:
B
Explanation:
We can see here that the functional group that the molecule have is: B. Carbonyl
What is a functional group?A functional group is a specific group of atoms or bonds within a molecule that is responsible for the characteristic chemical reactions and properties of that molecule. Functional groups are the parts of organic molecules that determine their reactivity and the types of chemical reactions they can undergo.
In organic chemistry, functional groups play a crucial role in understanding the structure and behavior of molecules. Different functional groups confer distinct properties to molecules, influencing their physical properties, solubility, acidity or basicity, and interactions with other molecules.
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If there is a name/surname you can't make out due to a speaker's manner of speech, what are you supposed to do?
We can call a person by the word gentleman and Sir or from his/her real name.
If there is a name/surname you can't make out due to a speaker's manner of speech then I will call him gentleman or Sir or I will ask him his real name. Gentleman is a word that is used for noble person and Sir word is also used in order to give someone respect.
Call a person with his real name is also comes under the manner of speech so we can conclude that we can call a person by the word gentleman and Sir or from his/her real name.
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major classification of crude product
pls mark as brainlist
Explanation:
Crude is classified, based on density, as light, medium, heavy, or extra heavy. It can also be classified, based on sulfur content, into a sour and sweet category.
Acid hydrolysis of N-methylbutyramide in water and hydrochloric acid with heat produces______________________________.
a. Butyric acid and methylammonium chloride.
b. Butanoic acid and ammonium chloride.
c. Butanoate and methylamine.
Answer:
A- Butyric acid and methylammonium chloride.
Explanation:
a meter is defined as 100. cm. How many significant digits are there in the value
Answer:
3 significant figure
Explanation:
Trailing zeros in a number are significant ONLY is the number contains a decimal point.
So if it was 100cm with out the decimal point would only have 1 significant figure.
periodicity in chemical properties is based on atomic structure." explain.
Answer:
Periodicity is caused by regular and predictable variations in element atomic structure. ... The rows in the periodic table (the periods) reflect the filling of electrons shells around the nucleus, so when a new row begins, the elements stack on top of each other with similar please help me rank up
Periodicity means the repeating trends in properties of elements in a regular interval. Precocity in chemical properties depends on the atomic structure because, the size, number of electrons, etc affects their reactivity.
What is periodicity?Periodicity is the repetition in in trends in properties after a regular interval. In periodic table, all the elements are classified into different groups and periods.
Groups are vertical columns containing elements of same number of valence electrons and similar chemical and physical properties. Periods are horizontal rows where elements are arranges in the increasing order of atomic number.
Along a period the atomic size decreases, ionization energy and electronegativity increases. But down a group just the reverse for this happens.
In a chemical reaction only valence electrons are participating and the size and number of valence electrons etc affects the chemical reactivity of elements. That's why it is said like periodicity in chemical properties is based on the atomic structure.
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What is important about the properties of a substance that has undergone a chemical
change?
The substances created during chemical reactions, on the other hand, do not simply revert to their initial state. The most essential thing to remember is that the makeup of a material does not change when it undergoes a physical change, but it does change when it undergoes a chemical change.
Answer:
the most important thing for you to remember is that in a physical change composition of a substance does not change and in a chemical change the composition of a substance does change
