Answer: photosphere.
Explanation:
The part of the Sun commonly called its surface is the photosphere. The word photosphere means "light sphere" – which is apt because this is the layer that emits the most visible light. It’s what we see from Earth with our eyes.
how many neutrons of atomic mass is 31 and atomic number is 12
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
As we know, Number of protons = Atomic Number
So,
Number of protons = 12And, Atomic mass = Number of protons + Number of Neutrons (N)
therefore ~
31 = 12 + N N = 31 - 12 N = 19Number of Neutrons = 19
silver has an atomic mass of 107.868 amu. silver has two common isotopes. one of the isotopes has a mass of 106.906 amu and a relative abundace of 51.881%. a. what is the % abundance of the other isotope. b. what is the mass if the other isotope.
A. The abundance of the 2nd isotope is 48.119%
B. The mass of the 2nd isotope is 108.905 amu
Let the 1st isotope be A
Let the 2nd isotope be B
A. Determination of the abundance of the 2nd isotope
Abundance of isotope A = 51.881%.
Abundance of isotope B =?Abundance of B = 100 – A
Abundance of B = 100 – 51.881
Abundance of B = 48.119%B. Determination of the mass of the 2nd isotope
Atomic mass of silver = 107.868 amu.
Mass of 1st isotope (A) = 106.906 amu
Abundance of isotope A (A%) = 51.881%.
Abundance of isotope B (B%) = 48.119%
Mass of 2nd isotope (B) =?[tex]atomic \: mass = \frac{mass \: of \:A \times \:A\%}{100} + \frac{mass \: of \:B \times \:B\%}{100} \\ \\ 107.868 = \frac{106.906\times \ \: 51.881}{100} + \frac{mass \: of \:B \times \:48.119}{100} \\ \\ 107.868 = \: 55.464 + 0.48119 \times mass \: of \:B \\ \\ collect \: like \: terms \\ \\ 0.48119 \times mass \: of \:B = 107.868 - 55.464 \\ \\ divide \: both \: side \: by \: 0.48119 \\ \\ mass \: of \:B = \frac{107.868 - 55.464 }{0.48119} \\ \\ mass \: of \:B =108.905 \: amu \\ \\ [/tex]
Therefore, the mass of the 2nd isotope is 108.905 amu
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The periodic table of the elements is a very useful organizational tool in science. What are some organizational tools you use in your daily life? How do they make your life easier
Answer:
There are several different types of tools you could encounter, including project management software, note-taking programs, journals, and day planners. Organization management tools help in sorting out one’s daily responsibilities and being more efficient with time: calendars, to-do lists, mind maps, document storage clouds.
Explanation:
what i know:) hope it helps
A sample of Ar gas occupies a volume of 1.2 L at 125 degrees * C and a pressure of 10 atm. Determine the temperature , in degrees Celsius, at which the volume of the gas would be 1.0 L at the same pressure .
Answer:
58.64
Explanation: You want to use the combined gas law equation (P1*V1)/(n1*T1)=(P2*V2)/(n2*T2). So first cross out what remains constant, so pressure and I assume moles (since it was not mentioned as a change). You want to change the temperature to Kelvin (always) to do work, then you can solve algebraically for the answer! Once you have your answer change it to Celsius since that's what you were asked for.
Hope this helped!
How are osmosis and facilitated diffusion similar?
Answer:
I think it's is because during osmosis because when the cell duplicates in osmosis it divides into two smaller daughter cells; in diffusion there is a higher concentration near where it is but its getting smaller particles from where the source is
50 POINTS!!!! PLEASE HELP I AM BEGGING!!!!!!
3CH4 and C3H12 have the same number and kind of elements. How are they different?
balanced chemical equations a) Sodium + Oxygen
b) Potassium + Chlorine
c) Hydrogen + Chlorine
d) Nitrogen + Hydrogen
e) Calcium + Nitrogen
f) Calcium carbonate
8) Zinc + Hydrochloric acid Zinc chloride + Hydrogen h) Ammonia + Nitrogen - Calcium nitride Carbon dioxide + Calcium oxide Ammonium nitride
Answer:
a) sodium oxide
b) potassium peroxide
c) Hydrogen chloride
d) form ammonia
e) Calcium nitride
why does a oxygen atom form a 2- ion
Answer:
It's because it has 2 electrons on its outer ring
Explanation:
It has a -2 ion due to it having 2 more electrons than protons making it an overall negative. It's well known in chemistry that the first ring can only hold 2 electrons while the second and furthermore can hold up to 8. But what happens when you have 9? a new ring starts and it would only contain 1 electron.. In our case here it has 2 more electrons than protons and those 2 electrons are located on the outer ring
Which compound contains both sigma and pi bonds? HCCl3 H2CO H2S HBr.
The compound that contains both sigma and pi bonds has been [tex]\rm \bold{H_2CO}[/tex]. Thus, option B is correct.
The compounds have been resulted by the sharing of the valence electrons between atoms, for the completion of octet of each elements.
The bonds can be saturated with the presence of only sigma bond. The unsaturated bonds has presence of pi bonds as well. The bond with one pi and one sigma has been a double bond, while 1 sigma and 2 pi has been a triple bond.
The bonds present in the following structures has been:
[tex]\rm HCCl_3=4\;\sigma\;bonds\\H_2CO=2\;\sigma,\;1\;\pi\;bond\\H_2S=2\;\sigma\;bonds\\HBr\;=1\;\sigma\;bond[/tex]
The compound with the presence of both sigma and pi bonds has been [tex]\rm \bold{H_2CO}[/tex]. Thus, option B is correct.
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The electron-domain geometry of a sulfur-centered compound is trigonal bipyramidal. The hybridization of the central sulfur atom is ________.
The hybridization state of the central sulfur atom is sp3d.
The valence shell electron pair repulsion theory describes the shape of molecules in terms of the number of electron pairs that surround the valence shell of the central atom in the molecule.
There are certain molecular shapes that are associated with certain hybridization states of the central atom. Since the central sulfur atom is trigonal bipyramidal, the hybridization state is sp3d.
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For the following hypothetical reaction:
3A + 12B --> 3C
How many moles of B will you need to convert 5 moles of A into as many moles of C as possible?
Answer:
20
Explanation:
You need 4 times the amount of B, compared to a (there is a 3A:12B which reduces to 1:4), so 4 times 5 is 20.
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Who turned the ragged Continental Army into a more efficient fighting force?
What is chemistry,define it ?
Answer:
the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.
Explanation:
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Prokaryotic and Eukaryotic Cells Booklet
Answer:
Power Plant = Mitochondria (Mitochondria is the powerhouse of the cell)
City Limits = Cell Membrane (Outer layer of a cell)
City Hall = Nucleus (The nucleus is the control center in a cell)
City Food Processing Plant (Chloroplast process the cells food)
City Plans = Chromosomes (They contain the genetic information about the cell)
Community = Cytoplasm (Mainly process of elimination)
Explanation:
Explanations are in parenthesis
Which gas makes your voice deeper or has the opposite effect on you than helium when you inhale it.
Answer:
Sulfur hexafluoride
Explanation:
It is heavier than air that we breathe so it has an opposite effect.
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Where do properties of matter come from?
Answer:
Extensive or inextinsive and either physical or chemical
There are 6. 022 Times. 1023 atoms of Hg in 1 mole of Hg. The number of atoms in 4. 5 moles of Hg can be found by multiplying 4. 5 by 6. 022 Times. 1023. Which is the number of atoms in 4. 5 moles of Hg, correctly written in scientific notation with the correct number of significant figures? 2. 7 Times. 1024 27 Times. 1023 2. 71 Times. 1024 27. 099 Times. 1023.
The number of atoms of Hg in 4.5 mole sample has been given as [tex]\rm 2.7099\;\times\;10^2^4[/tex]. Thus, option A is correct.
The number of atoms in a mole of sample has been given by Avogadro number. Avogadro number has been a constant and has been given the value of [tex]\rm 6.023\;\times\;10^2^3[/tex].
The number of atoms in a mole of sample has been given as:
[tex]\rm 1\;mole=\;6.022\;\times\;10^2^3[/tex]
The given sample has been consisted of 4.5 moles of Hg. Thus, the number of atoms in the sample has been given by:
[tex]\rm 1\;mole\;Hg=\;6.022\;\times\;10^2^3\;atoms\\4.5\;mol\;Hg=4.5\;\times\;6.022\;\times\;10^2^3\;atoms\\4.5\;mol\;Hg=27.099\;\times\;10^2^3\;atoms[/tex]
The scientific notation has been the short hand used for writing the numbers. The short hand for atoms in 4.5 moles of Hg has been [tex]\rm 2.7099\;\times\;10^2^4[/tex].
Thus, the number of atoms of Hg in 4.5 mole sample has been given as [tex]\rm 2.7099\;\times\;10^2^4[/tex]. Thus, option A is correct.
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Na2SO3" represents sodium sulfite. What does the 4 mean in the formula 4Na2SO3? There are four atoms of sodium. There are four atoms of sodium sulfite. There are four molecules of sodium sulfite. There are four elements in sodium sulfite. 7
The World on Turtle's Back" is a creation myth because it focuses on characters whom the Iroquois considered "gods. " is an Iroquoian story about people and animals who talk to each other. Explains how the Iroquois believe that the earth was created. Describes Iroquoian social and cultural values.
The designation "4" before Na2SO3 simply means that there are four molecules of sodium sulfite.
A molecule is formed when two or more atoms of the same or different elements come together. The formula of the molecule must reflect the number of atoms from which it is formed. The designation "4" before Na2SO3 simply means that there are four molecules of sodium sulfite.
The "The World on Turtle's Back" is a legend creation story. According to this story, the world was created on a giant turtle back. The folktale is common among the Iroquois Native Americans.
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7) Element Families on the Periodic Table have similar _____________________. There are ________ Families.
8) Alkali Metals are good conductors of _____________________________ and ________________________________.
9) There are a total of _________ elements that are grouped as Transition Metals.
10) As opposed to metals, non-metals can be very __________________________. They have no metallic ____________
and do not reflect ______________________.
11) All Lanthanide Series elements occur naturally except for ___________________________________.
12) All Actinide Series elements are ___________________________ and most are _____________________
The periodic table is composed of metals and nonmetals arranged in groups and periods.
The periodic table is an arrangement of elements in groups and periods based on their properties. The properties of elements repeat at regular intervals hence the term, "periodic".
The answers to the questions are;
7) Element Families on the Periodic Table have similar properties. There are 18 families.
8) Alkali Metals are good conductors of heat and electricity.
9) There are a total of 38 elements that are grouped as Transition Metals.
10) As opposed to metals, non-metals can be very opaque. They have no metallic luster and do not reflect light.
11) All Lanthanide Series elements occur naturally except for promethium.
12) All Actinide Series elements are radioactive and most are synthetic.
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How does an animal use sugar as a source of energy?
Plants and animals use glucose as a soluble, easily distributed form of chemical energy which can be 'burnt' in the cytoplasm and mitochondria to release carbon dioxide, water and energy. Pure monosaccharides, such as glucose, attract water.
An animal's body breaks down carbohydrates and converts them into simple sugar such as glucose. Glucose in the form of energy is carried through the blood and delivered to every cell of the body.
What is the function of sugar in animals?Carbohydrates are an important compound of all life on this planet. Both plants and animals utilize carbohydrates as a source of energy to keep their body functioning at the most basic level.
Carbohydrates fulfill needs by helping in the synthesizing of other chemicals and giving structure to cells within the body. Carbohydrates are carrying out normal functions such as growth, movement, and metabolism.
Carbohydrates store energy in the form of starch and provide either simple or complex sugars. Polysaccharides, give a steady supply of energy while sugars, monosaccharides, and disaccharides, supply quick energy on dissolving.
Carbohydrates have the side effect of helping with the processing of other body's chemicals. As carbohydrates break down, they release energy.
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Name the 4 properties of waves.
Answer:
the 4 properties of waves are frequency, amplitude, wavelength, and speed.
Explanation:
can you help me with this
Answer:
I think it is A
Explanation:
if I am wrong I am so so so sorry
but i'm pretty sure I am right.
please let me know if I am right :)
Aspirin (C9H8O4) is produced from salicylic acid (C7H6O3) and acetic anhydride (C4H6O3):
C7H6O3 + C4H6O3 -----> C9H8O4 + HC2H3O2
(a) How much salicylic acid is required to produce 1.5 x 10^2 kg of aspirin, assuming that all of the salicylic acid is converted to aspirin? (b) How much salicylic acid would be required if only 80% of the salicylic acid is converted to aspirin? (c) What is the theoretical yield of aspirin of 185 kg of salicylic acid is allowed to react with 125 kg of acetic anhydride? (d) If the situation described in part (c) produces 182 kg of aspirin, what is the percentage yield?
Explanation:
the equation is yes a the line of jointing line passing the ball to is
Answer the following question in 1-2 complete sentences. What factors can influence the properties of glass, which include its ability to transmit, reflect, or absorb light, or to be transparent?.
What factors can influence the properties of glass, which include its ability to transmit, reflect, or absorb light, or to be transparent?
Answer · 47 votes
The properties can be influenced by many factors. The most common are the shape of the object, the lighting where the object is located, the environment (colors, shapes, density of other objects, etc.), and the viewing angle of the observer.
8) (When allyl alcohol dissolves in water, the particles of allyl alcohol
a. remain intact.
b. react with water.
C. react with water forming solvated atoms.
d. react with water forming solvated ions.
9) The hydrogen bonding interaction between particles of allyl alcohol and water
occurs between the hydrogen atom of water
a. and the oxygen atom of allyl alcohol.
b. and the hydrogen atom of allyl alcohol that is covalently bonded to the oxygen atom.
c. and the hydrogen atom of allyl alcohol that is covalently bonded to the carbon atom.
d. Actually, hydrogen bonding is NOT the intermolecular force between allyl alcohol and
water
10) The hydrogen bonding interaction between particles of allyl alcohol and water
occurs between the oxygen atom of water
a. and the oxygen atom of allyl alcohol.
b. and the hydrogen atom of allyl alcohol that is covalently bonded to the oxygen atom.
C. and the hydrogen atom of allyl alcohol that is covalently bonded to the carbon atom.
d. Actually, hydrogen bonding is NOT the intermolecular force between allyl alcohol and
water
Hydrogen bonding interaction occurs between the oxygen atom of water and the hydrogen atom of allyl alcohol that is covalently bonded to the oxygen atom.
We must recall that allyl alcohol is a molecular substance. Molecular substances do not dissociate into ions in water. As such particles of allyl alcohol remain intact when dissolved in water.
Hydrogen bonding occurs when hydrogen is bonded to an electronegative atom such as oxygen. In allyl alcohol, hydrogen bonding interaction occurs between the hydrogen atom of water and the oxygen atom of allyl alcohol.
Also, hydrogen bonding interaction occurs between the oxygen atom of water and the hydrogen atom of allyl alcohol that is covalently bonded to the oxygen atom.
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A sample of ethanol (C2H6O) has a mass of 0. 2301 g. Complete combustion of this sample causes the temperature of a bomb calorimeter to increase by 1. 33°C. The calorimeter has a mass of 2. 000 kg and a specific heat of 2. 45 J/g•°C. What is the heat of combustion for this sample? kJ.
The heat of combustion of the sample is calculated to be -1300 kJmol-1.
We know that energy is neither created nor destroyed but is converted from one form to another. The heat lost by the ethanol when it is burnt is equal to the heat gained by the calorimeter.
Heat gained by calorimeter = 2.×10^3 g × 2. 45 Jg-1°C-1 × 1. 33°C
= 6.5 kJ
Number of moles of ethanol = 0. 2301 g/46 g/mol = 0.005 moles
Heat of combustion of the sample = -( 6.5/0.005 moles) = -1300 kJmol-1
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What mass of calcium chloride is needed to make 330.0 mL of 0.125 M
solution?
Answer:
4.58g
Explanation:
1.) What is the molar mass of CaCI2?
= 110.98 g/mol
2.) Find the mols
[tex]conc = \frac{mol}{volume(l)} [/tex]
conc × volume= mol
0.125 M x 0.33 L = 0.04125mol ( 330mL was converted to "L" by dividing 330 by 1000)
3.) The mass(g)
g= mol x atomic weight
g= 110.98g/mol × 0.04125
= 4.58 g
# NOTE M = mol/L
Can someone help me with this please
That is an ionic bond.
Explanation:
It has cations and anions
Synthetic fibers, like plastic, are derived from organic compounds. These fibers have been chemically changed by humans to last longer for better storage and more effective uses. These fibers are stronger than naturally occurring fibers like cotton and wool. Which of the following is a downside to these synthetic fibers when compared to natural fibers?
A.
The longer lasting material is more difficult to break down.
B.
The longer lasting material is less useful in manufacturing.
C.
The longer lasting material is not able to withstand high temperatures.
D.
The longer lasting material makes the fibers more expensive to buy.
The downside of this is that the longer lasting material is more difficult to break down.
Both natural fibers and synthetic fibers are polymer materials. Polymer materials are materials that are made by the agglomeration of small molecules called monomers.
The natural fibers are less long lasting than the synthetic fibers. The downside of this is that the longer lasting material is more difficult to break down. As a result of these, synthetic fibers lead to environmental pollution problems.
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Answer:
the longer lasting material is more difficult to break down.
Explanation:
