Answer:
69.37×10²³ atoms of silver
Explanation:
Given data:
Mass of sample = 1243 g
Number of atoms of silver = ?
Solution:
Number of moles of silver:
Number of moles = mass/molar mass
Number of moles = 1243 g/ 107.87 g/mol
Number of moles = 11.52 mol
Number of atoms:
According to Avogadro Law,
1 mole contain 6.022×10²³ atoms
11.52 mol × 6.022×10²³ atoms / 1mol
69.37×10²³ atoms
NEED HELP ASAP
Identify the type of reation. 2 NO2 ----> 202 + N2
A)
Synthesis
B)
Decomposition
C)
Single Replacement
D)
Double Replacement
Answer:
B) Decomposition
Explanation:
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Chemical equation:
2NO₂ → 2O₂ + N₂
The given reaction is decomposition reaction. NO₂ decomposed to give nitrogen and oxygen. All other options are incorrect because,
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
Single replacement:
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AC +BD
Question 8 of 10 Which wave property is related to the pitch of a sound? A. Crest height B. Frequency O C. Amplitude D. Rest position
Answer:
frequency
Explanation:
i took the test
How many moles of Helium would be equal to 55 liters of helium?
Answer:
Solution: 3.78 L He. 22.4 L. 1 mol. = 0.169 mol He.
Explanation:
Answer:
3.78 liters
Explanation:
If a balloon is filled with 3.78 L of He gas is at STP.
What principle is used in the above diagram to calculate the amount of carbon dioxide that s absorbed by laIId?
OA.
OB.
Oc.
OD.
the law of consevation of mass
the law of universal gravitation
cell theory
atomic theory
what does this graph represent?
Answer:Potential and kinetic energy
Explanation:
True of False: The "North" end of a Magnet will be repelled by another "North" end of a magnet
Answer:
True
Explanation:
Opposite attract when talking about magnets
Answer:
True.
Explanation:
Opposites attract. The two same forces of the north ends repel each other.
1. Are ions involved in metallic bonding?
2. How are the atoms arranged in a metal? Why?
Answer:
1 ans =The atoms that the electrons leave behind become positive ions, and the interaction between such ions and valence electrons gives rise to the cohesive or binding force that holds the metallic crystal together.
PLEASE HELP
Which of the following shows the kinetic form of mechanical energy?
A. Pedaling a bicycle
B. Holding a basketball
C. Lying on the ground
D. Watching television
Answer: A. Pedaling a bicycle
Explanation: i also have the same question too and im in 5th grade
which of the following described the process of osmosis?
Answer:
a process which occurs when there is a difference in solute concentration between two solutions separated by a semipermeable membrane.
hope this helps
Which landform explains the lack of cultural interaction between ancient China and ancient India? (4 points)
the Loess Plateau
the Chang River valley
the Gobi Desert
the Himalaya Mountains
Answer:
I had this question and it was the 4th one for me
Explanation:
Lipase is an enzyme that breaks down the fat in food molecules into smaller molecules. Which of the following best describes the function of lipase?
SEP Use Models Why does the number of electrons in each principal energy shell increase as the number of the shell increases?
Answer:
See explanation
Explanation:
The number of electrons in each principal energy shell increases as the number of shells increases because more electronic orbitals become available to accommodate the electrons.
For instance, the n= 2 level only accommodates eight electrons in the s and p orbitals whereas the n=3 level accommodates 18 electrons in s, p and d orbitals respectively.
Each principal level accommodates 2n^2 electrons where n= the principal energy shell.
The increase in the number of shell leads to increase in the number of electrons.
The number of electrons in each principal energy shell increase as the number of the shell increases because each cell can accommodate 8 electrons except the first shell which has only 2 electrons. The number of electrons increases when we go down the group due to addition of new shells.
The atom added new shells in the atom if the existing shells fill with electrons and no place is available for the remaining electrons so we can conclude that the increase in the number of shell leads to increase in the number of electrons.
Learn more: https://brainly.com/question/19756408
How many grams are in 39 moles of ammonium chloride? (Round to the nearest
whole number) Do NOT add units, enter numbers only!
Type your answer...
Answer:
468
Explanation:
A student carefully placed 18.1 g of sodium in a reactor supplied with an excess quantity of chlorine gas. When the reaction was complete, the student obtained 39.6 g of sodium chloride. How many grams of chlorine gas reacted?
Answer:
The mass of chlorine gas that reacted ≅ 24.03 g
Explanation:
From the given information:
The number of moles of NaCl formed = mass of NaCl/molar mass
mass of NaCl = 39.6 g
molar mass = (23 + 35.5) g/mol = 58.5 g/mol
∴
The number of moles of NaCl formed = 39.6 g / 58.5 g/mol
The number of moles of NaCl formed = 0.6769 g/mol
Thus, the mass of chlorine gad that reacted = 0.6769 × 35.5
The mass of chlorine gas that reacted = 24.02995 g
The mass of chlorine gas that reacted ≅ 24.03 g
Why are a molecule's atoms as far away from each other as they can get?
A. Forces between electron pairs push the atoms apart.
B. Induced dipoles push the atoms away from each other.
C. Electronegativity differences force the atoms apart.
D. The protons in the nuclei push the atoms apart.
Answer: A
Explanation:
Because I just answered it and it’s right. ( Forces between electron pairs push the atoms apart.
Please help noowwwww... if you don’t know please don’t answer
Answer:
i honetly dont thing anyone knows that so look it up
Explanation:
Which of these statements describes this mathematical equation?
P1v1/t1=k
The final pressure of a gas is directly proportional to volume and temperature change.
The final pressure of a gas is directly proportional to volume change and Inversely proportional to temperature che
The final pressure of a gas is inversely proportional to the volume change and directly proportional to temperature
none of the above
Answer:
The final pressure of a gas is inversely proportional to the volume change and directly proportional to temperature
Explanation:
Given
[tex]\frac{P_1V_1}{T_1} = k[/tex]
Required
Interpret
[tex]\frac{P_1V_1}{T_1} = k[/tex]
Multiply both sides by T1
[tex]T_1 * \frac{P_1V_1}{T_1} = k * T_1[/tex]
[tex]P_1V_1 = kT_1[/tex]
Divide both sides by V1
[tex]\frac{P_1V_1}{V_1} = \frac{kT_1}{V_1}[/tex]
[tex]P_1 = \frac{kT_1}{V_1}[/tex]
This can be rewritten as:
[tex]P_1 = k\frac{T_1}{V_1}[/tex]
In the above expression; k is a constant of proportionality.
So, the equation can be written as variation as follows:
[tex]P_1\ \alpha\ \ \frac{T_1}{V_1}[/tex]
To interpret:
P varies directly to T (the numerator) and inversely to V (the denominator).
Explain how thermal energy is transferred in convection.
Answer:
Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated. ... As a result, the particles take up more volume.
The thermal energy is transferred in convection through the movements of fluids, such as air or water.
Thermal energy refers to the energy associated with the movement of particles in a system. As temperature increases, the particles in a substance gain kinetic energy and move faster, resulting in an increase in thermal energy.
When a fluid is heated, its molecules gain kinetic energy and begin to move faster, causing them to spread out and become less dense. This creates a region of warm, less dense fluid that rises upward due to buoyancy.
As the warm fluid rises, cooler, denser fluid moves in to take its place, creating a convection current. This process continues as long as there is a temperature difference between the warm and cool fluids. The movement of the fluids transfers thermal energy from the warmer areas to the cooler areas.
Therefore, In convection, thermal energy is transferred through the movement of fluids, such as air or water.
Learn more about Thermal energy here:
https://brainly.com/question/3022807
#SPJ2
1.Which Statement best describes the use of a catalyst in a fuel cell?
A.It reduces waste
B.It lowers energy requirements
C.It reduces toxic exhaust
D.It increases reaction rates
Answer: D. It Increases reaction rates.
Explanation:
Answer:
D. It Increases reaction rates.
Explanation:
What letter or pair of letters that represent the
element.
If all the gas in container A is transferred to a small container, B, with no change in temperature, the pressure in container B will ______.
A. increase
B. decrease
C. not change
D. become equal to the outside air pressure
Taking into account the Boyle's law, the correct answer is option A.) If all the gas in container A is transferred to a small container, B, with no change in temperature, the pressure in container B will increase.
The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature, and moles.
As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls.
In this way pressure and volume are related, determining Boyle's law (on of the gas laws) which says:
"The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"
That is, if the pressure increases, the volume decreases; whereas if the pressure decreases, the volume increases.
In summary, the correct answer is option A.) If all the gas in container A is transferred to a small container, B, with no change in temperature, the pressure in container B will increase.
Learn more:
https://brainly.com/question/4147359?referrer=searchResultsdoes sound have color? why do you have this opinion (base your answer on wavelengths)
Answer:
Yep. Many of the sounds we associate with white noise are actually pink noise, or brown, or green, or blue. In audio engineering, there's a whole rainbow of noise colors, each with its own unique properties, that are used to produce music, help relaxation, and describe natural rhythms like the human heartbeat.
Explanation:
Please help! This is 8th grade science btw
Answer:
hacfgdeibjExplanation:
Hope this Helps!
:D
Can someone please help me with this? This is due today, please please help me!
ATOMIC NUMBER: It is the number of protons present in the nucleus of every atom
MASS NUMBER: It is the number of nucleon. Nucleon are the number of proton and neutrons present in the nucleus.
PROTON NUMBER: Proton number equal to the atomic number.
ELECTRON NUMBER: Electron Number is equal to the atomic number.
NEUTRON NUMBER: It is Mass Number - Atomic Number.
CHARGE: It is due to the addition or removal of the electron. + charge when electron removed and - charge when electron is added.
SYMBOL: It is represented as,
[tex]X^Z_A[/tex]
Z is Mass Number
A is Atomic Number
_____________________________________Worksheet:(I) ATOMIC NUMBER: 17
MASS NUMBER: 35.5
PROTON NUMBER: 17
ELECTRON NUMBER: 17
NEUTRON NUMBER: 18.5
CHARGE: 0
_____________________________________(II) ATOMIC NUMBER: 71
MASS NUMBER: 180
PROTON NUMBER: 71
ELECTRON NUMBER: 71
NEUTRON NUMBER: 109
CHARGE: 0
_____________________________________(III) ATOMIC NUMBER: 40
MASS NUMBER: 86
PROTON NUMBER: 40
ELECTRON NUMBER: 38
NEUTRON NUMBER: 46
CHARGE: +2
_____________________________________(IV) ATOMIC NUMBER: 92
MASS NUMBER: 238
PROTON NUMBER: 92
ELECTRON NUMBER: 86
NEUTRON NUMBER: 146
CHARGE: +6
_____________________________________(V) ATOMIC NUMBER: 82
MASS NUMBER: 206
PROTON NUMBER: 82
ELECTRON NUMBER: 78
NEUTRON NUMBER: 124
CHARGE: +4
_____________________________________(VI) ATOMIC NUMBER: 34
MASS NUMBER: 79
PROTON NUMBER: 34
ELECTRON NUMBER: 36
NEUTRON NUMBER: 45
CHARGE: -2
_____________________________________(VII) ATOMIC NUMBER: 48
MASS NUMBER: 113
PROTON NUMBER: 48
ELECTRON NUMBER: 49
NEUTRON NUMBER: 65
CHARGE: -1
_____________________________________(VIII) ATOMIC NUMBER: 21
MASS NUMBER: 42
PROTON NUMBER: 21
ELECTRON NUMBER: 21
NEUTRON NUMBER: 21
CHARGE: 0
_____________________________________(IX) ATOMIC NUMBER:
MASS NUMBER:
PROTON NUMBER:
ELECTRON NUMBER:
NEUTRON NUMBER:
CHARGE:
_____________________________________(X) ATOMIC NUMBER: 83
MASS NUMBER: 209
PROTON NUMBER: 83
ELECTRON NUMBER: 80
NEUTRON NUMBER: 126
CHARGE: +3
_____________________________________(XI) ATOMIC NUMBER: 47
MASS NUMBER: 108
PROTON NUMBER: 47
ELECTRON NUMBER: 47
NEUTRON NUMBER: 61
CHARGE: 0
_____________________________________(XII) ATOMIC NUMBER: 49
MASS NUMBER: 116
PROTON NUMBER: 49
ELECTRON NUMBER: 46
NEUTRON NUMBER: 67
CHARGE: +3
_____________________________________(XIII) ATOMIC NUMBER: 53
MASS NUMBER: 128
PROTON NUMBER: 53
ELECTRON NUMBER: 54
NEUTRON NUMBER: 75
CHARGE: -1
_____________________________________(XIV) ATOMIC NUMBER: 76
MASS NUMBER: 188
PROTON NUMBER: 76
ELECTRON NUMBER: 72
NEUTRON NUMBER: 112
CHARGE: +4
_____________________________________Best Regards,'Borz'When you have dominant allele T, recessive for t, T for tall and t for short, what will be phenotype for Tt?
PLEASE ANSWER QUICKLY I'LL GIVE 45 POINTS
Answer:
TT and Tt genotypes both expressed the tall phenotype because the T is dominant to t. Only the tt genotype expressed the short phenotype.
Explanation:
Hope this helped!
most matter does what when heated
Answer:
Expands
Explanation:
I don't know if that's an option but i hope it helps.
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
When we combine two simpler substances into a more complex one, it is known as a reaction.
Answer:
It would be known as a chemical reaction or a chemical compound.
The conversion factor 1 mol/6.02 × 1023 representative particles can be used to find the number of moles when the number of representative particles is known
true or false
To make a 7.21M solution, how many moles of solute will be needed if 12.0 liters of solution is required? (Stoichiometry)
Answer:
I think it's 78. I might be wrong I'm not sure.
Explanation:
+30 points
Answer right away!!
I will add a brainiest answer
Describe what happens to the air in a cold front
Be descriptive
Answer:
where a cold air mass is replacing a warmer air mass. ... The air behind a cold front is noticeably colder and drier than the air ahead of it. When a cold front passes through, temperatures can drop more than 15 degrees within the first hour.
Explanation:
The effects from a cold front can last from hours to days. The air behind the front is cooler than the air it is replacing and the warm air is forced to rise, so it cools. As the cooler air cannot hold as much moisture as warm air, clouds form and rain occurs.
