N=n×Nav
n=N / Nav
(5.71×10^22) / (6.02×10^23)
n=0.09mol
According to the concept of Avogadro's number, there are 0.0948 moles of silver present in 5.71×10²² atoms of silver.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Therefore, number of moles=number of atoms/Avogadro's number
number of moles=5.71×10²²/6.023×10²³=0.0948
Thus, there are 0.0948 moles in 5.71×10²² atoms of silver.
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Clouds are formed when
1.sunlight causes water droplets to evaporate
2.liquid water condenses on grass and windows.
3.raindrops freeze into tiny pellets and fall to earth.
4.water vapor in the air condenses to form liquid water or ice.
Answer:
D. Water vapor in the air condenses to form liquid water or ice
Explanation:
took test on e2020
Is it possible to return the gunpowder back to its original form (before it was set on fire)?
How?
Answer:
Yes its possible! and im so sorry but i dont know how Srryy but it is possible if i got it wrong im so sorry have a great day!
Explanation:
Which of the following is created when solids, liquids, or gases mix with one another?
a
Mixture
b
Element
с
Compound
d
Pure substance
Answer:
a . Mixture
Explanation:
When solids, liquids and gases mix with one another, the product is usually a mixture.
Mixtures are classified as impure substances because:
their composition is indefinitetheir constituents retains their identityconstituents reacts differently to changed conditionsthey can easily be separated into constituents by physical methodsPure substances are elements and compounds with typically definite compositions.
So, when substances in different phases combines, an heterogeneous mixture is produced.
Which of the following statements is NOT true about combustion reactions?
Select one:
a. The products are always carbon dioxide and methane.
b. The reactions involve burning of hydrocarbons.
c. Combustion reactions have oxygen and a hydrocarbon as reactants.
d. There are two types of combustion reactions: complete and incomplete.
Answer:
The answer is option C..
Statement that doesn't portray a combustion reactions in this question is
C: Combustion reactions have oxygen and a hydrocarbon as reactants.
Combustion can e regarded as a high-temperature exothermic redox chemical reaction which usually takes place in the presence of fuel and an oxidant,.This oxidant is usually oxygen and after oxidation, gaseous products is formed in mixture termed as smoke which are carbon dioxide and methane.Example of this are;
production of energy in thermal power plants.Burning of Wood or Coal Combustion of Natural GasTherefore, option C is correct.
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Which of the following objects has polarity?
A
the Earth, which has magnetic north and south poles
B
the city of Chicago, which has a North and Southside
C
a map of the country, which has a compass pointing north
D
an unmagnetized block of metal, which has a top and a bottom
Answer:
D
An unmagnetized block of metal, which has a top and a bottom
E
Which materials are moved by runoff?
nutrients
vegetation
O large rocks
O paved surfaces
Answer:
Nutrients
Explanation:
Materials that are moved by runoff nutrients.
What is the meaning of Nutrients?A substance that provides nourishment essential for the maintenance of life and for growth. A chemical compound (such as protein, fat, carbohydrate, vitamin, or mineral) contained in foods. These compounds are used by the body to function and grow.
Nutrients are the components found in our food such as carbohydrates, vitamins, minerals, fats, etc. These components are necessary for living organisms to survive. Plants produce their own food while animals and human beings do not produce their own food.
Therefore, Materials that are moved by runoff nutrients.
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1 One mole of a substance contains the same number of atoms or molecules as
one mole of any other substance.
a Which contains more atoms: 56 g of Fe or 16 g of S? Show your working.
Answer:
a) Fe contains more atoms.
Explanation:
To find the number of moles we divide by the molar mass:-
56g of iron (Fe) = 56/55.845 = 1.0028 moles
16g of Sulphur (S) = 16/32.06 = 0.6938 moles.
So 56g of Fe contains more atoms.
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 56 g of Fe contains the same number of atoms.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
moles of iron = 56/55.845 = 1.0028 moles
moles of sulfur = 16/32.06 = 0.6938 moles.
number of atoms=number of moles×6.022×10²³(Avogadro number)
number of atoms of iron = 1.0028×6.022×10²³
=6.038×10²³atoms
number of atoms of sulfur=0.6938×6.022×10²³
=4.178×10²³atoms
Therefore, 56 g of Fe contains the same number of atoms.
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Which compound contains the greatest percent oxygen by mass?
a. Na2C204
b. H2SO4
c. HIO4
d. KMnO4
Answer:c
Explanation:because the percent of oxygen by mass is not a funcion
A corn plant has been genetically engineered. It produces pollen that can make its own toxins. These toxins protect the corn plant against pests. What is a likely impact on the environment around the corn plant?
The carbon dioxide level would increase in the area.
Newer strains of pesticide-resistant pests may develop.
Bird and butterfly populations around the area may increase.
The concentration of pesticides in a nearby lake would increase.
Answer:
Newer strains of pesticide-resistant pests may develop.
Explanation:
Answer:
C. Newer strains of pesticide-resistant pests may develop
Explanation:
Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar. 60° A B 45° W C\1050 The measurement of angle B is The measurement of angle A is The measurement of angle C is entum. All rights reserved.
Answer:
blobby`
Explanation:
abc
When naming a compound, which of these is written first?
Answer:
cation
Explanation:
Metal
Nonmetal
Anion
Cation
When naming a chemical compound, the cation is written first before anything else.
A typical ionic compound consists of two components - the cation and the anion. While the cation is positively charged in ion, the anion is negatively charged. The cation of a typical ionic compound is named first before the anion and the name often carries that of the element that composes it.
The name of the element that makes up the anion is modified by removing the last few characters ending the name and replacing it with the suffix 'ide'. For example, NaCl is named sodium chloride.
At the time of naming a compound, the one that would be written first would be:
- Cation
The compounds are described as substances that consist of varying combinations of elements from the chemical union. The compounds are given the name by starting with the cation(+ve charged ion) that it possesses followed by the anions(-ve charged ions) it contains.For example, KCl(potassium chloride) involves K+ cations and Cl- anions. Thus, 'cation' would be the correct answer among the given options as they come later in the process.Learn more about 'Compound' here:
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manganese (IV) nitride formula
Answer:
Mg(NO3)2 is the formula of manganese (IV) nitride.
The formula for Manganese (IV) nitride is Mn3N4.
What is the formula for Manganese (IV) nitride?Manganese (IV) nitride is represented by the chemical formula Mn3N4. It consists of three manganese atoms (Mn) and four nitrogen atoms (N). The Roman numeral IV indicates that manganese has a +4 oxidation state in this compound.
Its powder can be used in the preparation of other nitride compounds with high hardness, high thermal conductivity, corrosion resistance, wear resistance and high temperature resistance properties.
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PLEASE HELP ME ANSWER
Answer:
The answer is A: Quantities of thousands are more common than quantities of trillions.
Explanation:
It's just kind of process of elimination. None of the other answers make as much sense
A person plugs a power cord into an electrical outlet in the wall. The power cord is covered in black rubber. Which statement is an accurate description of the materials?(1 point)
Electrons move through air when the cord is a few inches from the outlet.
Electrons would easily move through the person if there was no rubber around the wire.
Electrons would not move through the wire if there was no rubber around the wire.
Electrons easily move through the rubber around the wire.
Answer:
Electrons would easily move through the person if there was no rubber around the wire.
Explanation:
The black rubber material is an insulator and will not allow the conduction of heat or electrical current through it. Electrical currents are generated by the movement of electrons through materials.
Hence, if there was no rubber covering around the power cord, the person that plugged-in the power cord would have experienced electric shock because electrons would easily move through him/her from the wire.
please help me with this, thank you so much
How did Thomson show that cathode
rays are different from light?
Answer:
They had a negative charge
Explanation:
Factors that affect climate:
List and describe 2 factors that cause climate.
Factor 2
Factor 1:
HELPPP
What are the coefficients that will balance the equation below?
NaOH + AICI:
NaCl + Al(OH)3
1, 1, 1,3
1, 3, 1,3
3, 1, 3, 1
1, 3, 3, 1
Answer:
3, 1, 3, 1 is a required answer.
which of the following statements about matter is false?
a.) Atoms are the smallest units of matter that maintain their chemical identity.
b.) Heterogeneous mixtures are not uniform throughout.
c.) Homogeneous mixtures cannot be separated by physical means.
d.) A compound is a pure substance composed of two or more chemically bonded ator
Answer:
Heterogeneous mixtures are not uniform throughout.
Explanation:
Heterogeneous mixtures are not uniform throughout.
pls tell me answer
Answer:
no
Explanation:
In the early part of the 20th century, what did geologists use to figure out the interior of the Earth ?
Answer:
In the early part of the 20th century, geologists studied the vibrations (seismic waves) generated by earthquakes to learn more about the structure of the earth's interior. They discovered that it is made up of these distinct layers: the crust, the mantle, and the core.
How old is the oldest known plant fossil ?
16. On some occassions, more than half of the moon is illuminated.
a. True
O b. False
Answer:
true is the correct ans of this question
6. Challenge: To balance the inputs and outputs of cellular respiration, there should be the same number of carbon, oxygen, and hydrogen atoms on each side of the arrow.
Answer:
No, the equation is not balanced
Explanation:
The complete question is
Challenge: To balance the inputs and outputs of cellular respiration, there should be the same number of carbon, oxygen, and hydrogen atoms on each side of the arrow.
C6H12O6 + O2 ⇒ CO2 + H2O
A. Is the formula balanced as written? Why or why not?
Solution -
No, the equation is not balanced. The balanced chemical reaction of cellular respiration process is C6H12O6 + 6O2 ⇒ 6CO2 + 6H2O
The number of atoms of each element must be same on both the sides of the equation.
In the equation - C6H12O6 + O2 ⇒ CO2 + H2O, there are 6 carbon on left side of equation while only one carbon on the right side of equation. Like wise there are 12 hydrogen atom on LHS and 2 hydrogen atom on RHS. Oxygen number is also unbalanced.
How many grams of carbon dioxide are produced when 191 g of methane (CH4) are burned completely down as shown in the reaction below:
CH4+2O2--->CO2+2H20
Answer:
Mass = 525.36 g
Explanation:
Given data:
Mass of CO₂ formed = ?
Mass of CH₄ burned = 191 g
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of CH₄:
Number of moles = mass/molar mass
Number of moles = 191 g/ 16 g/mol
Number of moles = 11.94 mol
Now we will compare the moles of CH₄ and CO₂.
CH₄ : CO₂
1 : 1
11.94 : 11.94
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 11.94 mol × 44 g/mol
Mass = 525.36 g
Calculate the number of grams of sodium oxide that will be produced when 115g of sodium react with oxygen.
Answer:
Mass = 154.95 g
Explanation:
Given data:
Mass of sodium react = 115 g
Mass of sodium oxide formed = ?
Solution:
Chemical equation:
4Na + O₂ → 2Na₂O
Number of moles of sodium:
Number of moles = mass/molar mass
Number of moles = 115 g/ 23 g/mol
Number of moles = 5 mol
Now we will compare the moles of sodium and sodium oxide.
Na : Na₂O
4 : 2
5 : 2/4×5 = 2.5 mol
Mass of sodium oxide:
Mass = number of moles × molar mass
Mass = 2.5 mol × 61.98 g/mol
Mass = 154.95 g
Describe the major advantages and disadvantages of asexual and sexual reproduction.
Answer:
Allows for a quick "doubling of population because they skip pollination and fertilisation. There is less energy required for asexual reproduction. Large colonies can form that out complete the other organisms for nutrients and water. ... Sexual reproduction leads to genetic variation in new generations of offspring.
Explanation:
Asexual reproduction is usually faster and uses less energy than sexual reproduction. But asexual reproduction produces no differences in DNA among offspring, and creates competition for resources. Sexual reproduction produces differences in the DNA of offspring, and competition for resources is not as high. But sexual reproduction can require a lot more time and energy.
calculate the mass of 120cc nitrogen present at STP. how many number of molecules are present in it?
Answer:
[tex]0.15008\ \text{g}[/tex]
[tex]3.23\times 10^{21}[/tex]
Explanation:
1 mol of nitrogen at STP = 22.4 L = 22400 cc
n = Mol of [tex]N_2[/tex] = [tex]\dfrac{120}{22400}=0.00536\ \text{mol}[/tex]
M = Molar mass of [tex]N_2[/tex] = [tex]28\ \text{g/mol}[/tex]
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Mass of [tex]N_2[/tex] is
[tex]m=nM\\\Rightarrow m=0.00536\times 28\\\Rightarrow m=0.15008\ \text{g}[/tex]
Mass of the nitrogen is [tex]0.15008\ \text{g}[/tex]
Number of molecules is given by
[tex]nN_A=0.00536\times 6.022\times 10^{23}=3.23\times 10^{21}\ \text{molecules}[/tex]
The number of molecules present in it are [tex]3.23\times 10^{21}[/tex]
PLEASE HELP ME ANSWER
Answer: the second one multiplication
Explanation:
to sum up the question: why are some parts of the body more sensitive than others?
please help! if u help i’ll give u
brainliest answer :)
Answer:
Some areas of the body are more sensitive than others because they have more nerve endings. It hurts when you bite your tongue because the sides of your tongue have a lot of nerve endings that are very sensitive to pain! The tongue, lips, and fingertips are the most touch-sensitive parts of the body. The parts of your skin that need to be most sensitive like your fingertips and your lips have more receptor cells in them than others less sensitive areas. The least sensitive skin on the human body is found in the heel area. This is because there are very few nerves in the heel to feel things. If there were too many nerves in our heels then walking would be far too painful.
Explanation:
Answer: Some parts of the body are more sensitive than others because they each play an important role. For example, it hurts to bite your toungue because it has a lot of nerves.
Explanation:
