Answer:
That means that the isotope that has a mass number of 28 is probably the most abundant. This is because your average atomic mass is 28.086 amu, which is closest to 28.
Formula used to calculate average atomic mass follows:
average atomic mass=(atomic mass of an isotope)*(fractional abundance)
we are given=
Three isotopes of Silicon, which are Si-28, Si-29 and Si-30.
Average atomic mass of silicon = 28.086 amu
As, the average atomic mass of silicon is closer to the mass of Si-28 isotope. This means that the relative abundance of this isotope is the highest as compared to the other two isotopes.
Percentage abundance of Si-28 isotope = 92.2%
Percentage abundance of Si-29 isotope = 4.7 %
Percentage abundance of Si-30 isotope = 3.1%
Hence, the abundance of Si-28 isotope is the highest as compared to the other isotopes.
In the future, what would you expect to happen to the distances between galaxies?
The distances between galaxies are expected to increase.
This is due to the endless expansion of the universe, proposed by cosmological inflation.
what happens to molecules when the temperature drops or lowers
A the molecules stop moving
B the molecules get closer together
C the molecules start moving faster
D the molecules become smaller
what is an electrical force? just like the definition of an electrical force
Answer:
The attractive or repulsive interaction between any two charged objects is an electric force
Explanation:
that's the definition
What is the half life of an atom that goes from 16000 g to 125 g in 163.24 days.
Answer:
[tex]23.32\ \text{days}[/tex]
Explanation:
N = Final mass of atom = 125 g
[tex]N_0[/tex] = Initial mass of atom = 16000 g
t = Time taken = 163.24 days
[tex]t_{1/2}[/tex] = Half life
We have the relation
[tex]N=N_0\dfrac{1}{2}^{\dfrac{t}{t_{1/2}}}\\\Rightarrow 125=16000\times \dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \dfrac{125}{16000}=\dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \ln0.0078125=\dfrac{163.24}{t_{1/2}}\ln0.5\\\Rightarrow t_{1/2}=\dfrac{163.24\times\ln0.5}{\ln0.0078125}\\\Rightarrow t_{1/2}=23.32\ \text{days}[/tex]
The half life of the atom is [tex]23.32\ \text{days}[/tex].
Substance
Formula
Mass,
(g)
Physical Color
State
Density Boiling
, (g/cm) Point,
Methane
сн.
16.0
Gas
Colorless
0.423
-161.5
Ammonia
NH,
17.0
Gas
Colorless
0.70
-33
Unknown
???
???
???
???
???
???
Propane
CH
44.1
Gas
Colorless
0.493
-12.1
Bromine
Br.
159.8
Liquid
Red
4.04
58.8
Lithium
Li
6.94
Solid
0.534
1342
Silvery,
white
metal
Magnesium Mg
24.3
Solid
1.74
1090
Silver,
white
metal
Answer:what are u asking to do?
Explanation:
Calculate the average atomic mass of antimony
Antimony-121 has a mass of 120.904 amu and a natural % abundance 57.21
Antimony-123 has a mass of 122.904 amu and a natural % abundance of 42.79
can you give the work aswell trying to understand how to do it
Answer:
Wow, now this one is a hard one, took me quite a while to figure it out but here it is
The abundances of the two isotopes is:
Antimony-121 = 57.2%
Antimony-123 = 42.8%
Explanation:
Determine a skier's velocity in km/h, if it takes her 1.7 min to ski down a
1.67 km slope.
Answer:
103
Explanation:
do not listen to the haters
A person is pushing a box with a mass of 25 kg. If it accelerates at 0.3 m/s2, what is the force being applied to the cart?
Answer:
The answer would be 80kg
Explanation:
Have a good day.
Explain why there is a difference in the thickness of the crust between the side of the moon facing the Earth and the side that faces away from the Earth?
Answer:
the lack of maria; the thicker crust means it was harder for giant impacts to pierce the crust and get darker basaltic lava bubbling up.
Explanation:
True or False:Excessive thermal energy will result in the removal of salt from the oceans.
Answer:
false
Explanation:
the excessive heat would cause the water to evaporate so it wouldn't remove the salt it would remove the water. what you would get would be an ocean bed with tons of salt at the bottom.
Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?
selective breeding
cloning
artificial selection
gene therapy
Answer:
Hi, the answer is C. Artificial Selection
I know this becasue I just finished my test
Explanation:
What does chemical weathering do to the original minerals (THIS IS SCIENCE BUT I COULDN'T FIND SCIENCE CATAGOREY)
Answer:
Chemical weathering changes the composition of the original minerals.
Explanation:
Which belief is the basis of Ptolemy's geocentric model of the solar system?
Answer:
"Earth-centered," or "geocentric" Ptolemy thought that all celestial objects — including the planets, Sun, Moon, and stars — orbited Earth. Earth, in the center of the universe, did not move at all.
Explanation:
Answer:
Geocentric
Explanation:
Its the belief that earth was the center of the solar system instead of the sun
Describe the role of the ocean in the water cycle?
Answer:
Don't get me wrong the seas are, by distant, the biggest store of water on soil, over 96% of all of Earth's water exists within the seas. Not as it were do the seas give dissipated water to the water cycle, they moreover permit water to move all around the globe as sea streams. I mean, that's all i know man, give me a break.
Explanation:
Which of the following is true with respect to energy in a closed system?
A.
Energy can be destroyed, but cannot be created.
.
Energy can be created, but cannot be destroyed.
B.
OOOO
C. The system's kinetic energy must equal its potential energy.
D.
The total amount of energy in the system always stays the same.
Answer:
D. The total amount of energy in the system always stays the same
Explanation:
In the closed system, the total amount of energy in the system always stays the same.
What is closed system?Closed system is a arrangement in which exchange of energy or any material is restricted.
If any reaction is carried out in a closed system then energy of the system may convert from internal energy to potential or from potential to kinetic energy. But the total energy of the closed system is always remain same as before and after the reaction.
Hence option (D) is correct.
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a copper ore contains 3.00% of copper carbonate, CuCO3, by mass. Which mass of copper would be obtained from 1 tonne of the ore?
A 1.91kg B 3.71kg C 15.3kg D 58.4kg
Answer:
(c) 15.39 kg of copper present in 1tonne of ore.
Explanation:
We are given that ore contains 3% of copper carbonate
1tonne = 1000kg
3% of copper carbonate in 1000kg of ore will be
= [tex]\frac{3}{100}*1000[/tex] = 30kg
30 kg of copper carbonate is present in ore
CuCO3 has 63.5g of cupper present in it
molar mass of CuCO3 = 123.5
so the percentage of copper present in CuCO3
= [tex]\frac{63.5}{123.5}*100[/tex] = 51.3% of copper present per kg CuCO3
Now
amount of copper present in 30kg of CuCO3
= [tex]\frac{51.3}{100}* 30[/tex] = 15.39kg
15.39 kg of copper present in 1tonne of ore
The mass of copper obtained from 1 tonne of the ore is 15.4 kg
The copper ore has 3% of copper carbonate by mass.
The mass of copper carbonate in 1 tonne of the ore can be calculated below.
1000 kg = 1 tonne
Therefore,
mass of copper carbonate = 3 /100 × 1000 = 30 kg
atomic mass of copper = 63.5 g
molar mass of CuCO₃ = 123.55 g
123.55 g of CuCO₃ gives 63.5 g of copper
30, 000g of CuCO₃ will give ? of copper
cross multiply
mass of copper = 30,000 × 63.5 / 123.55
mass of copper = 1905000 / 123.55 = 15418.8587616 g
mass of copper = 15418.8587616 / 1000 ≈ 15. 4 kg
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Which of the following is a component of natural gas? A)gasohol B)methane C)gasoline D)kerosene
Answer:
Methane
Explanation:
It is methane because, it comes from natural sources.
Based on the diagram, which statement explains how energy is conserved during this chemical reaction? (A) is also gained by the surroundings. B. The potential energy changes indicated by C and B involve energy lost by the surroundings. C. The potential energy lost by the reaction system (C) is also lost by the surroundings. D. The potential energy lost by the reaction system (B) is gained by the surroundinas
Based on the diagram, the statement explains how energy is conserved during this chemical reaction is the potential energy lost by the reaction suystem (B) is gained by the surroundings.
What is exothermic reactions?Those reactions in which eneregy is released during the whole process, because energy of product is less than the energy of reactants.
In the given diagram it is given that energy of the reactants are more as compare to the products, so the reaction is exothermic in reaction means heat is released during this reaction. This released energy will absorb by the surrounding of the reaction system to maintain the law of conservation of energy.
Hence, option (D) is correct.
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The statement that explains how energy is conserved during this chemical reaction is the potential energy lost by the reaction system (B) is gained by the surroundings.
What is conservation of energy?The law of conservation of energy says that the energy of an isolated system never changed.
The energy neither be created nor destroyed.
Thus, the correct option is D. the potential energy lost by the reaction system (B) is gained by the surroundings.
Learn more about conservation of energy
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A can was filled with crushed ice, sealed, and massed. The ice was melted by slowly warming the can and its contents. No water vapor escaped and no air entered the can. If the can is then massed again after the ice has melted, what is the best prediction of the mass?
A) The mass would be the same.
B) The mass would be more.
C) The mass would be less.
D) It is impossible to predict without more information.
Answer:
A) The mass would be the same.
Explanation:
Since there is no loss of any particle to vapor during the phase change process from solid to liquid, the mass of the before and after the process will remain the same.
In this way, the law of conservation of mass is obeyed. Mass is the amount of matter contained in a substance. Since there is no room for escape or matter loss, the mass will remain the same.Answer:
be the same
Explanation:
1. Give the similarity (or similarities) between Cl and CI^(-1).
Answer:
1) atomic number is the same. Both, chlorine atom and anion, have atomic number 17. They have 17 protons in nucleus of an atom.
2) both are the same element.
Explanation:
CAN SOMEONE PLEASE HELP ME WITH THIS
Answer:276ml
Explanation:
What is the overall charge of the compound, NaF?
+2
-2
-1
0
Answer: -1
Explanation: It is neutral because the Na and F atoms are transferring their valence electrons in order to become stable. This results in an overall stable atom. If we were to identify the individual charges of verbalized atoms, Na would have a positive charge, and F a negative charge - both of 1.
It's not -1.
the answer is (0), hope this helped
NEED HELP ASAP 7th grade science btw pls
Answer: the answer is A or Tributaries, River system and rivers
Explanation: Its A i had the same question last year for my 10th grade assignment
help please it’s due today
Answer: I would say it would move 70 N right
Explanation: Well lets say its mass is heavy from the looks of the picture its a big box, anyways the girl with have all of her 30 newtons into it making it easier to move for the boy with 40 newtons plus 10 newtons left doesnt make sense neither does the 70 N left but why would it only move 10 to the right is 70 newtons are being used
on it?
If a neutral compound is composed of carbon and hydrogen and you know that it has exactly 2 carbons connected by a double bond, how many hydrogens will the compound have?
Answer: 4 hydrogens
Explanation:
This is what the structure will look like C=C. Remember that it's important that all structures have a complete octet. As it looks right now each carbon is sharing 4 valence electrons so each needs 2 more bonds to hydrogen complete its octet.
Answer: 4 hydrogens
Explanation:
PLEASE HELP!!!!! NEED HELP ASAP!!!!!
Directions: Name the ionic compound created.
EXAMPLE- Sodium and chloride OR NaCl= Sodium chloride
Barium and sulfur =
Magnesium and bromine =
Al2O3 =
KCl =
Answer:
1.BaCO3 2.MgBr2 3.aluminum and oxygen 4.Potassium chloride
Explanation:
Compare a mixture and a compound. How are they alike?
Contrast a mixture and a compound. How are they different
Answer:
1.Difference.
Mixtures are physically combined and can be separated by physical means while compounds are chemically combined and are separated by chemical means.
2.Mixtures do not have mixed boiling and melting points while compounds have mixed boiling and melting points.
2.Similarity.
Both mixtures and compounds are composed of two or more substances or elements combined.
Both can be separated.
Mixtures and compounds are alike in the following ways:
1. Both mixture and compound contains two or more substances.
2. Both mixture and compound can be separated.
3. Both mixture and compound have physical properties.
Differences between mixture and compound:Mixtures and compounds are different in the following ways:
1. A mixture contains two or more substances that are not chemically combined together while a compound contains two or more substances chemically combined together.
2. A mixture can be separated by physical methods while a compound can only be separated by chemical methods.
3. Mixtures can not be represented using a chemical formula. Compounds can be represented by chemical formula.
4. Examples of mixtures include: milk, kerosene in water etc. Examples of compounds include water, sodium chloride etc
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An object has a mass of 60 ounces and a volume of 30 cups. What is the density? _______ oz/cup (your answer should *only* be a number, round to one decimal place if needed) *
Answer:
2.0
Explanation:
Given data:
Mass of object = 60 ounce
Volume of object = 30 cups
Density = ?
Solution:
d = mass/ volume
d = 60 ounce/ 30 cup
d = 2.0 oz/cup
Thus, density of object is 2.0 oz/cup.
Which option will increase the rate of reaction?
A) removal of one of the reactants
B) decrease the volume of container
C) lower the temperature of reaction
D) reduce the pressure in the container
Answer:
B
Explanation:
when you increase the pressure of a closed container , its volume decreased.
in general when pressure is increased, rate of reaction is increased.
Identify the following examples as either physical or chemical change.
(Ill give brainliest if right)
Answer:
7. Chemical
8. Chemical
9. Physical
10. Physical
11. Physical
12. Physical
Explanation: