Consider an element X that has two naturally occurring isotopes with the following percent abundances: the first isotope has a mass number of 84.912 and is 72.17% abundant; the second isotope has a mass number of 86.909 and is 27.83% abundant. What is the average atomic mass for element X?
Answers
Related Questions
What is the density of a rectangle solid with dimensions
of 15 cm x 25 cm x 5 cm and has a mass of 3000 g?
Answers
Answer:
5625000gm/cm^3
Explanation:
volume=w*h*l=25*15*5=1875cm^3
density=mass*volume
=1875*3000
=5625000gm/cm^3
what is the primary difference between and hypothesis and a theory
Answers
A hypothesis, on the other hand, is similar to a theorem, but it stands pretty much on its own and is not known to be linked to other theorems in any way. A hypothesis usually has no compelling reasons to be true or false. Hypotheses can be classified into the following categories:
The degrees of freedom of a theory have not yet been determined. These could be properties of a theory that haven't been fully determined yet. A theory can be expressed in a finite number of ways, and accepting one of them is referred to as "forming a hypothesis." It's about the aspects of a hypothesis that aren't fully formed yet.Once evidence is discovered, a hypothesis may evolve into a theory.A hypothesis that could become a theory if a mathematical formulation can be established.A hypothesis based on common sense and known theories that is not intended to become part of a bigger theory, but rather to explain a single fact. This could include things like beliefs regarding the formation of the earth.A theory derives a large number of predictions from a limited number of theorems or assumptions, which fall into the following categories:
Things we already knew to be true and can be explained by other theories.Things we previously knew to be true, but which no other theory could explain or predict.Things that we didn't know were true but were later confirmed to be true.Things we didn't realize were true, and don't know if they are still true, but don't contradict current measurements.Formula for:
* Density: D = M/V?
* Mass: ?
* Volume?
(CHEMISTRY FORMULAS ONLY!!)
Answers
V=nRT/P
How many molecules in a mole?
Answers
Answer:
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.
Explanation:
hope this helped!
Which property is the least reliable method for identifying a mineral
A. color
B. luster
C. streak
D. cleavage
Answers
Answer:
I think it is a color but I'm not completely sure
Answer:
Color
Explanation:
In a one or two paragraph summary explain why Sodium light is Orange and Potassium light is lilac when placed in a flame.
Use the words: electron, quantum jump, ground state, orbitals, photons, emitting, absorbing, light spectrum, energy mass (words are not in order)
Answers
Answer:
?
Explanation:
I NEED HELP! An iron cube is placed in liquid water. Which particles have the higher kinetic energy?
Answers
Answer:
Liquid water has higher kinetic energy thn iron cube
Explanation:
Please mark as brainliest
Please Help ASAP! Will Mark Brainliest
Answers
Answer: 35. it is 100°C
36. there is 7 periods in the periodic table
37. A heterogeneous mixture consists of visibly different substances or phases. ... Solutions have particles which are the size of atoms or molecules - too small to be seen. Oil and water form a heterogeneous or cereal and milk also makes a heterogeneous. a example of solution mixture is salt and water or rubbing alcohol.
38. A two phase mixture is a mixture of two different substances. An example of a two phase mixture would be a soft drink. It is a liquid and a gas. To separate these two substances you could heat the liquid and then capture the carbon dioxide.
Explanation:
I hope this helps you out buddy stay safe
plz help for braniliest
Answers
Answer: i think b.
Explanation:
What are some identifying factors of Sodium (Na)
Answers
Explanation:
what causes Spanish-American War
Use what you know about periodic trends and the periodic table to answer the questions below.
Which atom attracts electrons most strongly when bonded?
oxygen (O)
magnesium (Mg)
Answers
Answer:
oxygen (O)
Explanation:
Answer:
A) oxygen (O)
Explanation:
edge 2023
Gold atoms can be identified based on the number of which subatomic particles?
A. Protons
B. nuclei
C. electrons
D. neutrons
Answers
Answer:B
Explanation:
calculate the number of molecules in 52 gram of helium
Answers
Answer:
The molar mass that is the mass of 6.022 X 1023 atoms of helium is 4g. Hence 1 mole of He = 4 g of He = 6.022 X 1023atoms of He.
1 g of He = (6.022 X 1023) / 4 atoms of He.
52 g of He = (6.022 X 1023X 52 ) / 4 atoms of He.
Explanation:
In a 2.00 g sample, which has the greatest number of atoms?
AI
S
All are equal
Na
Р
Answers
Answer
so AI has 13 atoms
S has 16 atoms
Na has 11 atoms
P has has 15 atoms
so the one with the most is S
S is sulfur
sulfur has many uses when it is processed along with some some biological uses.
Explanation:
A certain atom has 20 electrons, 21 neutrons, and 20 protons. What is the atomic mass of the atom?
Answers
Explanation
To get the atomic mass you add the number of protons and neutrons
Example
21 neutrons + 20 protons = 41 Atomic mass
Hope this helps :)
Test anxiety symptoms can include
a. Shaky hands
b. Sweating
C. Headaches
d. All of these
Please select the best answer from the choices provided
O A
B
С
Answers
Answer:
D.) All of the above
Explanation:
Anxiety can cause sweating, chaky hands, headaches etc
Which pair of elements have the same number of atomic orbitals?
A.
Silver and strontium
B.
Sodium and strontium
C.
Silver and sulfur
D.
Sulfur and strontium
Answers
Answer:
B I think
Explanation:
Answer:
B, I'm guessing by their characteristics
PLEASE HELP ME I WILL MARK AS BRAINLIST.
When we have stomach disorder, we take antacid to solve the problem. How does it help? Support your answer with an equation.
Answers
Answer:
idk
Explanation:
The Earth revolves in a path called_________around the sun.
Fill in the blank
Will get brainiest if correct.
Answers
Answer:
Revolution that is it
An unknown element has two isotopes. The first isotope has a mass of 68.926 amu and an abundance of 60.108%. The second isotope has a mass of 70,925 amu and an abundance
of 39.892%. Calculate the average atomic mass AND identify the element.
Answers
Answer:
69.72344108
Gallium
Explanation:
M
r
(
G
a
)
=
69.7231
to 4 decimal places
.
Explanation:
To find the average atomic mass (
A
r
) of an element, given the percentage rarities of its isotopes, simply multiply each isotope's
A
r
by its percentage that is expressed as a decimal and total the results. We can carry this out in a single line of working:
M
r
(
Ga
)
=
(
68.9256
⋅
0.60108
)
+
(
70.9247
⋅
0.39892
)
M
r
(
Ga
)
=
69.7231
to 4 decimal places
Similarly, you could input the percentages normally and then divide by
100
:
M
r
(
Ga
)
=
(
68.9256
⋅
60.108
)
+
(
70.9247
⋅
39.892
)
100
M
r
(
Ga
)
=
69.7231
to 4 decimal places
Notice that the answers are the same. Also observe that the answer is closer to 69 than it is to 71, which makes sense since gallium-69 makes up a greater proportion of gallium in the universe (
~
60
%
) than gallium-71 does (
~
30
%
)
Carbon decays every 5700 years. If you found a rock containing Carbon that has gone through 2.5 half lives, how old is that rock?
Answers
Answer:
14,250 years old.
Explanation:
First, multiply the two lifetimes. - 11,400.
Then, divide 5,700 in half for the 0.5 lifetime. - 2,850.
Lastly, add them all up. - 11,400 + 2,850 = 14,250 years old.
sorry if incorrect <3
thats what i understood XD
Water
Specific Heat (J/c "C)
4.184
How much heat is needed to change the temperature of 50.0 g of water to 20.0°C
Answers
Answer:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
Explanation:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
What is a mole in chemistry
Answers
Answer:Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
Explanation:
Which of the following statements about matter at
room temperature is true?
a. A solid has a definite volume, but a liquid's
volume can change.
b. Both a solid and a liquid Have a definite shape.
c. A solid has a definite shape, but a liquid's shape
can change.
d. Both a solid and a liquid have volumes that can
change.
e. A solid's shape can change, but a liquid has a
definite shape.
Answers
Answer: D
Explanation: If there was ice, the volume will change, if there was liquid (ex: water), it wouldn’t melt.If I use warm water on my plants then they will grow faster as hot water increases metabolism." This is an example of
Question 1 options:
a hypothesis
a theory
a research question
a scientific explanation
Answers
Answer:
a hypothesis
Explanation:
A hypothesis is a statement that is supposed or assumed before conducting any experiment. It is the assumption that is made on the basis of certain knowledge and controlled evidence in the initial time of the experiment. The initial assumption helps in taking the experiment or the investigation further. The truth is not ascertained in the initial phase rather the completion of the investigation is necessary to make a hypothesis turn into a theory.
In the given situation, the statement given is a hypothesis because the use of the warm water for the growth of the plants is the assumption made with respect to the metabolism effect on the humans.
what happen when two light waves traveling from oppsite direactions meet?
Answers
Answer:
When two or more waves meet, they interact with each other. The interaction of waves with other waves is called wave interference. Wave interference may occur when two waves that are traveling in opposite directions meet. The two waves pass through each other, and this affects their amplitude
Explanation:
hope this helps!
Oxygen gas is produced when hydrogen peroxide reacts with manganese
dioxide. How would you identify the oxygen gas? Name the method/test you
would use and explain the details of your observations to confirm the identity of
the gas.
Answers
Answer:
method used is decomposition
Explanation:
Hydrogen Peroxide (H2O2) will decompose rapidly in the presence of Manganese Dioxide, acting as the catalyst, to produce Oxygen gas and water.
When the Hydrogen Peroxide and Manganese Dioxide are mixed, Oxygen gas bubbles should be seen coming from the mixture. One can collect this Oxygen gas produced over water (through water-displacement) and store it inside a bottle for later use.
The invention of the microscope allowed scientists to see and study cells. True or false
Answers
Answer:
True
Explanation:
can someone call me and help me with chemistry
860-833-8822
Answers
Answer: okay
Explanation:
Answer:
What exactly do you want help with
Explanation:
What type of energy results from the burning of wood or gasoline?
electric
nuclear
chemical
Answers
Answer:Electric
Explanation: Its right.
Chemical energy results from the burning of wood or gasoline. Therefore, option (C) is correct.
What is chemical energy?Chemical energy is described as the energy which is stored in the chemical bonds formed in the chemical compounds. It is liberated during the chemical reaction and produces heat as a side-product which is known as an exothermic reaction.
Examples of chemical energy are biomass, natural gas, batteries, petroleum, and coal. When chemical energy is released from a compound, it is transformed into a completely new substance.
While burning wood or fuel, the chemical energy in the wood or gasoline is liberated as heat because of the chemical reaction of oxygen in the air and wood. This kind of chemical reaction is known as a combustion reaction. Combustion reaction converts the chemical energy stored in the wood into light energy and heat.
Therefore, in the burning of wood or gasoline, chemical energy is emitted.
Learn more about chemical energy, here:
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