Element X has two isotopes. One has a mass of 45.0 amu and is 45.0% abundant. The other has a mass of 47.0 amu and is 55.0% abundant. What is the average atomic mass of element X?*
0 46.1 amu
O 36.5 amu
0 43.8 amu
0 48.9 amu
Answers
The average atomic mass of element X that has two isotopes (one of 45.0 amu mass and 45% abundance and the other of 47.0 amu mass and 55.0% abundance) is 46.1 amu (option 1).
The average atomic mass (A) of element X can be calculated as follows:
[tex] A = m_{1}\%_{1} + m_{1}\%_{1} [/tex] (1)
Where:
m₁: is the mass of isotope 1 = 45.0 amu
m₂: is the mass of isotope 2 = 47.0 amu
%₁: is the abundance percent of isotope 1 = 45.0 %
%₂: is the abundance percent of isotope 1 = 55.0 %
Hence, the average atomic mass is (eq 1):
[tex] A = m_{1}\%_{1} + m_{1}\%_{1} = 45.0 amu*45.0\% + 47.0 amu*55.0\% = 45.0 amu*0.45 + 47.0 amu*0.55 = 46.1 amu [/tex]
Therefore, the average atomic mass of element X is 46.1 amu (option 1).
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Related Questions
NEED HELP ASAP! Write a statement explaining your claim about whether or not the equation is correctly balanced.
Then, provide evidence that supports your claim about whether or not the equation is correctly
balanced. Next, connect your evidence to your claim about the equation.
Answers
Answer:
I think that it it correctly balanced that is my opinion and, because the way it is set up, that the answer will tell you weather or not it is correctly balanced or not.
Evaluating the number of atoms of each element on the product and reactant side, we can conclude that the student's equation isn't balanced.
Given the chemical reaction :
[tex] Al_{4}C_{3} + 6H_{2}O ---> 3CH_{4} + 4Al(OH)_{3} [/tex]
For a balanced equation, the number of atoms of each element in the product side must be equal to that on the reactant side.
Number of hydrogen :
Reactant side = (6 × 2) = 12
Product side = (6 × 2) + (6 × 2) = 12 + 24 = 24
Product side ≠ reactant side ; Hence, the equation isn't balanced
The balanced equation for the reaction goes thus :
[tex] Al_{4}C_{3} + 12H_{2}O ---> 3CH_{4} + 4Al(OH)_{3} [/tex]
Reactant side :
Al = 4
H = (12 × 2) = 24
O = 12
C = 3
Product side :
H = (6 × 2) + (6 × 2) = 12 + 24 = 24
Al = 4
O = 4 × 3 = 12
C = 3
Therefore, the student's equation isn't balanced, the balanced version of the equation has been given .
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Where do most metabolic reactions occur?
all of the above
O plasma membranes
O nucleus
O cytoplasm
Answers
Answer:
CYTOPLASM
Explanation:
MOST REACTION REQUIRE WATER TO OCCUR
SINCE ENZYME WORK BEST WHEN DISSOLVED IN WATER
WATER IS PRESENT IN CYTPLASM HENCE IT IS MAIN SITE OF MEABLIC REACTIONS
Water quality tests show the presence of a single heavy metal in the drinking water pulled from a local river. Residents are suffering from numerous stomach ailments and are showing signs of long-term kidney damage. The residents of the next town, down river from the first town, seem to be unaffected. Water quality tests in the river by the second town show two types of heavy metals at acceptable legal limits in the water. One of the metals is the same as the one in the first town. What can scientists infer about the possible reason for the illnesses appearing in the first town but not the second?
One metal causes an acute effect, compared to the other.
One metal causes a chronic effect, compared to the other.
The heavy metals have a synergistic relationship when combined.
The heavy metals have an antagonistic relationship when combined.
Answers
Answer:
One metal causes a chronic effect, compared to the other
Explanation:
because the question only said ONE is the same, didn't they? so that would mean that not all the metals are the same for both towns
Which type of fire can help prevent
larger fires in the future?
Answers
hope it helps
This atom tends to gain an electron in its outer shell so that there are a total of 8 electrons.
Answers
oh its a Chlorine isn't it....
it's electronic configuration is
2,8,7
so to make it 8 in its outermost shell it should gain 1 electron...
Someone pls help me I will make you brain
Answers
Answer:
a
Explanation:
The energy an object has due to its movement or position is called
Answers
Answer:
Potential energy
Explanation:
When an object is moving its called Potential energy.
When an object is not moving it is called kinetic energy.
Help meeeeeeeeeeeeeee
Answers
AMSWER :
CHEMICAL FORMULA :
• WATER - H2O
• CARBONDIOXIDE - CO2
• SODIUM HYDROXIDE - NaOH
• SULPHURIC ACID - H2SO4
• SODIUM CHLORIDE - NaCI
• SODIUM BICARBONATE - NaCHO3
Discussion Question: Your classmate said,
"I think Gold is a pure substance that can't be broken down any further
Do you agree or disagree with this statement. Explain your reasoning using clues from the statement and the periodic
table.
Answers
Answer:
yes gold is pure
Explanation:
1. Which subatomic particles (electrons, neutrons, protons) affect stability?
2. Which subatomic particles affect charge?
3. Which subatomic particle changes the element?
Answers
Answer:
1 is protons and neutrons
2 is electrons and protons
3 Is protons
Need help with #1 and #2
Answers
Answer:
To calculate half life, divide original value by 2.
1.
FOUR HALF LIVES = divide original value by 2, 4 times.
40÷ 2 = 20
20 ÷ 2 = 10
10 ÷ 2 = 5
5 ÷ 2 = 2.5g
2. AFTER TEN DAYS (TWO HALF LIVES)
140 ÷ 2 = 70
70÷ 2 = 35g
AFTER TWENTY DAYS (FOUR HALF LIVES)
140 ÷ 2 = 70
70 ÷ 2 = 35
35 ÷ 2 = 17.5
17.5 ÷ 2 = 8.75g
A 1.044 g sample contains only vitamin C (C6H8O6) and sucralose (C12H19Cl3O8). When the sample is dissolved in water to a total volume of 33.0 mL, the osmotic pressure of the solution is 3.69 atm at 295 K. What is the mass percent of vitamin C and sucralose in the sample?
Answers
Answer:
Refer the attachment for answer..
hope it helps you..
Which hybrid orbitals overlap to form the sigma bonds between the indicated atoms in xanthine?
Answers
Many nitrogen and carbon atoms can be found in the structure of a heterocyclic molecule called xanthine, which is present in many biological systems.
The development of a sigma bond between these atoms is an essential component of its binding. A special example is the sigma bond between the nitrogen atom and the neighboring carbon atom. In the context of this sigma bond, the hybridization state of nitrogen can be either [tex]\rm sp^2[/tex]or [tex]\rm sp^3[/tex], and the hybridization state of carbon can be [tex]\rm sp^3[/tex]. A sigma bond is formed when the hybrid orbitals of carbon and nitrogen, which are each [tex]\rm sp^2[/tex] hybridized and [tex]\rm sp^3[/tex] hybridized, overlap. A strong covalent bond can develop when the [tex]\rm sp^2[/tex] hybrid orbitals of nitrogen and carbon line up. This allows electron sharing.
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In the fall, how does the high pressure area
affect the hurricane?
Answers
Answer:
Hurricanes occur when ocean water warms during the spring, summer and early fall.
Explanation:
Warm air just above the water’s surface rises. The rising warm air creates a reduction in pressure at the surface, what meteorologists call a low-pressure area. Because nearby air is at a higher pressure, it will flow into the low-pressure zone.
https://www.sidmartinbio.org/how-does-a-high-pressure-system-affect-a-hurricane/
NEED HELP ASAP!!!!!!!!!!!!!!!!!!!!!!
Answers
A noble gas has 8 electrons between the p and s orbitals of the outer shell. Helium is the exception because it only has two electrons.
∴ 1s²2s²2p⁶ is the noble gas (neon)what if water didnt have a negative charge?
Answers
Answer:
Explanation:
It would be positively charge
If you have two pistons in a system, which exerts the larger force?
Answers
Answer:
The larger piston
Explanation:
(i just took the same test)
which will have a greater volume: 10 grams of liquid water or 10 grams of solid water?
Answers
please help need ideas for lab report
Compounds Lab Report
Instructions: In this virtual lab you will build chemical compounds from known elements. Record your hypothesis and compound results in the lab report below. You will submit your completed report to your instructor.
Note: If you cannot complete this lab as directed, please contact your instructor for assistance.
Name and Title:
Include your name, instructor's name, date, and name of lab.
Objectives(s):
In your own words, what is the purpose of this lab?
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Procedure:
The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.
Data:
Record the composition of each of your compounds below. Be sure to include the number of atoms for each element. An example has been supplied for you.
Compound Name
Chemical Formula
Sodium (Na) Atoms
Calcium (Ca) Atoms
Hydrogen (H) Atoms
Oxygen (O) Atoms
Carbon (C) Atoms
Chlorine (Cl) Atoms
Ex: Sodium
hypochlorite
NaClO
1
0
0
1
0
1
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.
Using two to three sentences, summarize what you investigated and observed in this lab.
Why do you believe knowing how elements and compounds react together is essential in everyday matters?
Some elements are more "reactive" than other elements; why do you think this is?
Choose one of the compounds from the table and explain how you know the numbers of atoms in your formula.
Is it possible for two different compounds to be made from the exact same two elements? Why or why not? With a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?
Answers
Answer:
Objectives(s):
In your own words, what is the purpose of this lab?
To teach me about chemical compounds
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment. If you combine two certain compounds, then it will make a new compound.
Procedure:
The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.
Data:
Record the composition of each of your compounds below. Be sure to include the number of atoms for each element. An example has been supplied for you.
Compound Name
Chemical Formula
Sodium (Na)
Atoms
Calcium (Ca)
Atoms
Hydrogen (H)
Atoms
Oxygen (O)
Atoms
Carbon (C)
Atoms
Chlorine (Cl)
Atoms
Ex: Sodium
hypochlorite
NaClO
1
0
0
1
0
1
Carbon Tetrachloride
CCl4
0
0
0
0
1
1
Water
H2O
0
0
1
1
0
0
Calcium Hydroxide and Hydrogen Gas
Ca(OH)2 + H2
0
1
1
1
0
0
Sodium Hydride
NaH
1
0
1
0
0
0
Sodium Hydroxide
NaOH
1
0
1
1
0
0
Chlorine Dioxide
ClO2
0
0
0
1
0
1
Hydrogen Chloride
HCl
0
0
1
0
0
1
Table Salt
NaCl
1
0
0
0
0
1
Bleach
NaClO
1
0
0
1
0
1
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.
Using two to three sentences, summarize what you investigated and observed in this lab. I investigated how chemical compounds work and what to use to put them together.
Why do you believe knowing how elements and compounds react together is essential in everyday matters? So, you can cook and stop injuries, these two things happen a lot in day-to-day life.
Some elements are more "reactive" than other elements; why do you think this is? Because certain elements in the compound may react more to fire or water and many other elements.
Choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. Because if you add all the atoms, put in that’s the total amount. For example, water has one hydrogen atom and one oxygen atom, so water has two atoms.
Is it possible for two different compounds to be made from the exact same two elements? Why or why not? With a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds, or do we have many compounds in this world? Yes, it is possible like water and hydrogen peroxide. The formula of water is H20 but hydrogen peroxide has one more oxygen-H202.
Explanation:
Which of the following is not involved in bringing materials into cells?
a. endocytosis b. osmosis c. active transport d. exocytosis
Answers
Answer:
b
Explanation:
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Fufjgjggkfkgbtkggjtbgjj
. Why can atomic number be used to determine the identity of an element?
Answers
Answer:
Because each atomic number is unique.
Explanation:
Atomic number = No. of protons in an element
Each atomic number in each element is unique and that makes it easier to distinguish it between several elements.
Answer:
Because atomic numbers are unique to the element
hope this helps <3
Question 4 (2 points)
(02.04 MC)
Jackson is making dinner and is trying to dissolve salt into a pot of water. The salt is dissolving slowly. What should Jackson do to speed up the
rate of dissolving? (2 points)
O.
Ob
Oc
He should put larger salt particles in the water.
He should hear the water to a higher temperature.
He should completely stop stirring the pot of water.
He should slow down the speed he is stirring the pot
Od
Question 5 (2 points)
(02.04 MC
ribed below
Answers
Answer:
B. He should heat the water to a higher temperature.
Explanation:
Tiny particles that make up water and salt vibrate at higher speeds in hotter temperatures, which mixes the salt and water faster. This causes salt to dissolve much faster.
CONNECT IT
Relate how a household sponge and water can be used to model
the concept of an unsaturated solution, a saturated solution, and a supersaturated
solution.
Answers
The sponge is unsaturated when it is taking in more water. It becomes saturated when it stops taking in water. It is supersaturated when water starts oozing out from the sponge.
A saturated solution contains just as much solute as it normally hold at a particular temperature. An unsaturated solution contains less solute than it can normally hold at a particular temperature. A supersaturated solution contains more solute than it can normally hold at a particular temperature.
We can use a sponge to model these three scenario as follows;
Water continues to enter into the sponge when it is unsaturated, this continues until the sponge becomes saturated with water and takes in no more water. When the sponge becomes supersaturated, water begins to ooze out from the sponge because it can no longer hold more water.
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what is pyruvic acid changed into in lactic acid fermentation
Answers
Answer:
pyruvic acid changes to alcohol and carbon dioxide.
Explanation:
In lactic acid fermentation, pyruvic acid from glycolysis changes to lactic acid. This type of fermentation is carried out by the bacteria in yogurt, and by your own muscle cells.
I HOPE THIS HELPS!!!!!
Alcohol and carbon dioxide are produced when pyruvic acid is fermented. The chemical process in which molecules break down is called as fermentation.
What is fermentation ?Fermentation is an anaerobic chemical process that breaks down molecules like glucose. Pyruvic acid undergoes fermentation to produced lactic acid.
More specifically, fermentation is the foaming that happens during the creation of wine and beer, a procedure that has been around for at least 10,000 years.
Pyruvic acid produced during glycolysis transforms into lactic acid during lactic acid fermentation. Alcohol and carbon dioxide are produced when pyruvic acid is fermented.
Thus, the pyruvic acid when change into lactic acid fermentation obtained alcohol and carbon dioxide.
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between a water molecule and an ethanol molecule, a hydrogen bond can occur between a lone pair of electrons on the _____a_____ in water and the _____b_____ of an ethanol molecule.
Answers
Answer:
They will form a hydrogen bond with the oxygen atom and the polar hydrogen atom.
Between a water molecule and an ethanol molecule, a hydrogen bond can occur between a lone pair of electrons on the Oxygen and a Hydrogen in water and the Polar hydrogen of an ethanol molecule.
What is Hydrogen bond ?Hydrogen bonding is an interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons.
It is a bond is weaker than an ionic bond or covalent bond but stronger than van der Waals forces.
In the given question, They will form a hydrogen bond with the oxygen atom and the polar hydrogen atom.
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Someone pls help me I will make you brain
Answers
Answer:
a
Explanation:
i took test
which of the following is a pure substance
1 heterogenous mixture
2 homogenous mixture
3 solution
4 element
Answers
Answer:
2 homogenous mixture
Explanation:
Someone pls help me I will make you brain
Answers
Answer:
its c I truly believe that it is c
Explanation:
70 points!!!! will mark the brainliest,
ANSWER ASAP PLS??????????????
Answers
Answer:
I believe it's A.
Explanation:
Answer:
option C
Explanation:
There are 2 types of changes
Physical change :- The physical properties are changed and its temporary.Chemical change :- The chemical properties are changed and its permanent.An atom of an element with atomic number 48 and mass number 120 contains
A. 48 protons, 48 electrons, and 72 neutrons
B. 72 protons, 48 electrons, and 48 neutrons
C. 120 protons, 48 electrons, and 72 neutrons
D. 72 protons, 72 electrons, and 48 neutrons
Option 5
Answers
Answer:
a
Explanation:
proton remains same as the atomic number
electron remains same as the atomic number
Mass no.- atomic no. = Neutrons