Answer:
Number of silver atoms
=
0.0134
⋅
m
o
l
×
N
A
.
N
A
=
Avogadro's number
Explanation:
Silver has a molar mass of
107.87
g
⋅
m
o
l
−
1
.
What does this mean? It means that if I have such a mass of silver, there are Avogadro's number,
N
A
=
6.022
×
10
23
,
individual silver atoms.
So all I have to do is divide the mass by the molar mass, and multiply this number (a molar quantity!) by Avogadro's number.
So, moles of silver
=
1.45
⋅
g
107.87
⋅
g
⋅
m
o
l
−
1
=
0.0134
⋅
m
o
l
And
number of silver atoms
=
0.0134
⋅
m
o
l
×
6.022
×
10
23
⋅
silver atoms
m
o
l
−
1
=
?
?
silver atoms
Explanation:
Mr. Avogadro has set up 4 jars with one mole of each the following substances:
1. Iron
2. Sodium Chloride
3. Sodium Bicarbonate (NaHCO3)
4. Aluminum
His clever and intelligent students notice that all of the amounts of the various
substances are different from one another, even though they are all ONE MOLE.
Explain the reason why each amount in the jar is different in terms of the mole. Then,
calculate the molar mass for each of the substances. Circle your your answers and
include the unit used for molar mass.
Answer:
Although they have the same mole, they have different molar masses because of their chemical composition.
1. Iron: 55.845 g/mol
2. Sodium Chloride: 58.44 g/mol
3. Sodium Bicarbonate (NaHCO3): 84.006 g/mol
4. Aluminum: 26.982 g/mol
Explanation:
Use the periodic table to determine their molar masses by looking at the atomic mass of each element
1. Given
2. 22.99 (Na) +35.45(Cl) =58.44
3. 22.99(Na)+1.008(H)+12.011(C)+[3*15.999 (O)] = 84.006
Notice how O is multiplied by 3 because there are 3 atoms of oxygen
4.Given
Which characteristic is a behavior adaptation in birds?
of course migration
Explanation:
if you need help again i'll be there.
Answer:
yea its migration
Explanation:
2. A book sits on a table. Which of the following is true?
a. The forces acting on the book are balanced.
b. The forces acting on the book are unbalanced.
C. Gravity is the only force acting on the book.
d. The net force acting on the book is 3N.
Answer:
hi
Explanation:
The Earth's surface is warmed because _____.
the ionosphere traps the sun's heat
it absorbs all of the sun's radiation
the atmosphere absorbs more short-wave radiation than the land
land and water absorb more short-wave radiation than the atmosphere
Answer:
b it absorbs all of the suns radiation
Answer:
land and water absorb more short-wave radiation than the atmosphere
Explanation:
The outside layer of cells on the top and bottom of a leaf
Answer:
I think it would be the Stomata and the Lower Epidermis
Please help!! I'll name you brainliest!!
Answer:
Chlorine
Explanation:
Potassium needs to lose one electron Chlorine needs to gain 1 electron
Answer:
S (Sulfur)
Explanation:
hope this helps!
What is the electron configuration for Cl? orbital notation for Cl?
Answer:
Explanation:
Electron Configuration - [Ne] 3s² 3p⁵
Orbital Notation - Can't type that out, please see the image.
Solve the following problem with the correct number of significant figures.
5.31 cm + 8.4 cm + 7.932 cm
Multiple choice question.
A)
22 cm
B)
21.6 cm
C)
21.642 cm
D)
21.64 cm
Which is not an example of a code?
Choose the correct answer.
A. a secret
B. a memory from the past
C. the sign language alphabet
D. the information on a credit card
does sugar have ionization of ions in water
Which type of fertilization is common with animals that live in the water?
1. external fertilization
2. sexual
3. internal fertilization
4. asexual
External fertilization in animals usually occurs in water or in damp areas in a process called spawning.
1. What mass of Mgo will I make from 48 g of Mg?
2Mg + O2 + 2MgO
Answer:
80.6 g
Explanation:
MgO=24.3+16=40.3 g
48.6/24.3= 2 moles
64/2x16= 2 moles
2x40.3= 80.6g
QUICK!!!! please
Which of the following dilutions would produce 2.0M acid from 3.0M acid
A) 3.0mL acid and 2.0mL water
B) 2.0mL acid and 1.0mL water
C) 2.0mL acid and 3.0mL water
D) 1.0mL acid and 2.0mL water
Answer:
that's a difficult question
Explanation:
Sorry!!!!!
complete combustion of wax takes place in____ zone of a candle flame.
Answer:
outer or non - luminous
Explanation:
complete combustion of wax takes place in non-luminous zone of a candle flame.
Answer:
A complete combustion of wax takes place in outer zone of a candle flameExplanation:
The middle zone is yellow and luminous because As it is an oxygen-depleted zone, insufficient oxygen exists to burn all of the wax vapor. ... The outer zone is the area where the flame is the hottest and complete combustion of wax takes place.When bacteria reproduces asexually are the offspring uniform or diverse?
Bacteria reproduces asexually and produce genetically identical offspring. They produces a large number of offspring quickly and all will be uniform.
What is binary fission?Binary fission is the asexual method of reproduction in bacteria. Asexual reproduction creates clones of the original parent, which results in kids that are genetically identical to the parent.
Asexual reproduction allows for the rapid production of vast numbers of children by a single person. Asexual reproduction is a successful method of reproduction in a stable or predictable environment since all the children will be suited to that environment.
Asexually reproducing organisms may be at a disadvantage in an unstable or unpredictable environment since all of the progeny are genetically similar and might not have the genetic diversity to survive in new or changing settings.
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How many moles is 118 grams of Argon
Answer:
[tex]\boxed {\boxed {\sf About \ 2.96 \ moles \ of \ Argon}}[/tex]
Explanation:
To convert from grams to moles we must use the molar mass, which is found on the Periodic Table.
Argon: 39.9 g/molUse the molar mass as a ratio.
[tex]\frac{39.9 \ g \ Ar}{1 \ mol \ Ar}[/tex]
Multiply by the given number of grams: 118
[tex]118 \ g \ Ar *\frac{39.9 \ g \ Ar}{1 \ mol \ Ar}[/tex]
Flip the fraction so the grams of argon will cancel each other out.
[tex]118 \ g\ Ar * \frac{1 \ mol \ Ar}{39.9 \ g \ Ar}[/tex]
[tex]118 * \frac{ 1 \ mol \ Ar}{39.9 \ g \ Ar}[/tex]
[tex]\frac {118 \ mol \ Ar }{ 39.9 }[/tex]
[tex]2.95739348 \ mol \ Ar[/tex]
The original measurement of grams had 3 significant figures, so our answer must have 3 sig figs.
For the number we calculated, that is the hundredth place. The 7 in the thousandth place tells us to round the 5 to a 6.
[tex]2.96 \ mol \ Ar[/tex]
There are about 2.96 moles of Argon in 118 grams.
What mass of Na2CO3 is required to create 750 mL of an aqueous solution where the concentration of the carbonate (CO3-2) ions is 1.75 M? (assume complete dissociation)
Answer:
139.11 grams
Explanation:
The molarity (M) is equal to m (moles) /L (liters).
Notice how it is in mL so converting it would be 0.75 L (750*10-3)
Now plug in the information
1.75=m/0.75
m=1.3125
Now m is in moles so convert to grams to get the mass
1.3125 mol Na2CO3 * 105.9888 g Na2CO3 = 139.1103
What is the name of theses
NO2
N2O
ZnF2
CCl4
SeH2
K2O
Answer:
nitrogen
nitrogen oxide
zincflorite
?
potassium oxide
How many atoms are found in one molecule of water?
Answer: To calculate the number of molecules and atoms in a water drop, you need to know the chemical formula of water. There are two atoms of hydrogen and one atom of oxygen in each water molecule, making the formula H 2 O. So, each molecule of water contains 3 atoms. Molar Mass of Water
Explanation: Hope this helps!
From: Kenma! ^^
Answer:
the answer is 3 atomsExplanation:
DONT HAVE MUCH TIME 4 MIN
21. The number of protons in an element is called the _______________ number.
22. Irene Curie used ___________________ as the source of alpha particles for her research.
23. Uranium goes through _____________ decay ____________ (a number) times to produce
Plutonium.
24. ________________ is a raw Uranium ore which was central to the discovery of radioactivity.
25. The ____________________ was cited in the letter signed by Einstein as having ore with
high concentrations of U-235.
Answer:
21. A to m i c number
22. P o l o n i u m
23. N e p t u n i u m -239, I don't know the second one
24. U r a n i n i t e
25. M a n h a t t a n Project
Explanation:
These are just my guesses, So some of them might not be correct.
How many moles are there in 3.9 grams of potassium
Answer:0.025576559594663 mole.
Explanation:
DUE IN 10 MINUTES PLZZZZ
Part IV: True/False
____ 38. The mass of the nucleus is small compared to the mass of the atom.
____ 39. Alpha particles would be harder to turn than Beta particles.
____ 40. Positive charge was spread all throughout the atom in the Rutherford Model.
____ 41. The Manhattan Project was located in New York for most of its duration.
____ 42. The cathode rays produced by Thomson were identical for all filaments.
____ 43. It is possible to know where an electron is and what path it is on.
____ 44. X-rays are produced when fast moving electrons strike phosphor coatings.
____45. All nuclear changes involve at least two reactants.
Answer:
true false true false true fake
Answer:
38. False
39. True
40. True
41. True
42. False
43. False
44. True
45. True
Explanation:
Note these are just my guesses they might not all be correct but I will do my best.
Hope this helps you at all! Feel free to correct me if I got any of them wrong :)
A family pool holds 10,000 gallons of water. How many cubic centimeters is this?
Answer:
3.785412e+7cm³
Explanation:
Have a nice day.
Whats the correct answer ???
A field of science that studies atoms and molecules is called _______
A field of science that studies atoms and molecules is referred to as chemistry.
What is chemistry?Chemistry is the discipline of science that examines the attributes, composition, and framework of elements and compounds, as well as the energy released or absorbed once they change.
Food, apparel, shelter, health, power, and clean air, water, and soil are all dependent on chemistry.
Chemical technologies improve our quality of life in a variety of ways by fixing issues in health, equipment, and energy usage.
Respiration, digestion, photosynthesis, cooking food, burning fuel such as coal and petroleum, cleaning garments and utensils, and many more are examples of chemistry in everyday life.
All of these activities occur in our daily lives and are subjected to chemical reactions.
Thus, chemistry is the field of science that studies atoms and molecules.
For more details regarding chemistry, visit:
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The lower the pH level, the more acidic the solution
True or False?
Answer:True
Explanation:
is soil a producer, decomposer, or consumer
9. _____________ have a mass number of 0.
10. Particles found in the nucleus are called ______________________.
11. _____________________________ is when electrons are released by a hot filament.
12. The number of protons and neutrons in an element is called the _______________ number.
13. ____________________ was the first atomic bomb dropped.
14. _________________ would be an example of a spontaneous change to the nucleus.
15. _____________ decay results in the release of two protons and two neutrons.
16. __________________ are particles that would be attracted to a positively charged plate.
17. __________________________ coined the word radioactivity.
18. ____________________________________ is used to produced radioactive isotopes by
forcing nuclear reactions.
19. During __________________, the nucleus of a Uranium 235 atom is split into lighter
elements, neutrons, and energy.
20. _________________ are the fastest form of radiation.
21. The number of protons in an element is called the _______________ number.
22. Irene Curie used ___________________ as the source of alpha particles for her research.
23. Uranium goes through _____________ decay ____________ (a number) times to produce
Plutonium.
24. ________________ is a raw Uranium ore which was central to the discovery of radioactivity.
25. The ____________________ was cited in the letter signed by Einstein as having ore with
high concentrations of U-235.
Answer:
sheeesh thats a lot
Explanation:
Answer:
9. Neutronium
10. Protons and Neutrons
11. cathode
12. mass
13. Little Boy
14. Radioactive decay
15. Alpha
16. Electrons
17. Marie Curie
18. Nuclear fission
19. fission
20. Gamma
21. atomic
22. aluminum foil
23. beta/ 2
24. X-rays
25. Einstein–Szilárd letter
what is hybridization
Answer:
Hybridization is the concept of mixing atomic orbitals into new hybrid orbitals suitable for the pairing of electrons to form chemical bonds in valance bond theory.
What does c represent in the carbon cycle diagram?
Answer:
carbon
Explanation:
I'm pretty sure if not
Answer:
The adjacent diagram shows the carbon cycle with the mass of carbon, in gigatons of carbon (Gt C), in each sink and for each process, if known. The amount of carbon being exchanged in each process determines whether the specific sink is growing or shrinking.