Calculate the average atomic mass of a
sample of lead that is 24.1% lead-206
(205.974 amu), 22.1% lead-207 (206.976 amu)
and 53.8% lead 208 (207.977 amu).
Answer: 207.217 amu
Work:
203.973 amu *(0.014) = 2.855 amu
205.974 amu *(0.241) = 49.639 amu
206.976 amu *(0.221) = 45.741 amu
207.977 amu *(0.524) = 108.979 amu
2.855 + 49.639 + 45.741 + 108.979 = 207.217amu
Explanation:
The average atomic mass has been defined to be the total mass given by the relative abundances and masses of the isotopes. The average atomic mass of lead is 204.359 amu.
What is average atomic mass?The average atomic mass has been given by the masses and relative proportions and abundances of the isotopes of the elements that differ from the mass of the element in the periodic table. It is the average mass given by the sum of the masses and the abundances.
Given,
Abundance of lead-206 = 24.1%
The abundance of lead-207 = 22.1%
The abundance of lead-208 = 53.8%
Mass of lead-206 = 205.974 amu
Mass of lead-207 = 206.976 amu
Mass of lead-208 = 207.977 amu
The average atomic mass is given as:
= (205.974 × 0.241) + (206.976 × 0.221) + (207.977 × 0.524)
= 49.639 amu + 45.741 amu + 108.979 amu
= 204.359 amu
Therefore, 204.359 amu is the average atomic mass.
Learn more about average atomic mass, here:
https://brainly.com/question/13753702
#SPJ2
Molten steel is poured into molds to make car parts and then allowed to cool and harden. This is an example of –
A. Physical change
B. Physical property
C. Chemical change
D. Chemical property
Answer:
A. Physical Change
Explanation:
Physical change is a type of change in which no new substance is formed, change of state can occur, the appearance of matter can be altered but not its chemical component.
Molten steel being poured into molds to make car parts and then allowed to cool and harden is an example of Physical change because;
- A change of state only occured from molten steel to solid steel.
- No new substance is formed.
Which one of the following is an alkane?
A. C2H4
B. C5H10
C. C3H8
D. C4H6
Hello
Answer:
C. C3H8
How have batteries gotten better over time
Answer:
Yes they have gotten better overtime
Explanation:
3. An object has a mass of 20.0 grams and a volume of 5.0 cubic centimeters. Give the
density
density= mass/ volume
d= 20/5
d= 4 g/cm^3
Which of the following is a question of morality?
1.beliberately reporting false data.
2.keeping a sloppy record of experimental observations.
3.conducting a drug experiment which will harm lab rats
4. accidentally reporting false data.
Answer:
3
Explanation:
conduct experiment on live animal is not human way so it's a question of morality...
The melting point of chromium is 1890. The melting point of argon is -189. Suggest a reason for this difference.
Answer:
Different forces between atoms and difference in structure.
Why do we research
before conducting our
experiment?
Without doing research before doing an experiment you’d be at risk, example: Chemical reactions that COULD cause chemicals burning through human skin, or setting off an harmful explosion by mixing unknown chemicals together.
What is the mass of 4.02 mol Ba(NO2)2
Hope this help you;)))
Considering the definition of molar mass, the mass of 4.02 mol Ba(NO₂)₂ is 921.9468 grams.
Molar mass is the mass of one mole of a substance, which can be an element or a compound.
Therefore, knowing the molar mass, the mass can be calculated using the expression:
mass= moles× molar mass
In the periodic table, you can find the molar mass of the elements, also called atomic mass or atomic weight.
To calculate the molecular mass of a compound, also called mass or molecular weight, you must add the molar mass of the elements of the compound multiplied by the number of atoms of each element that make up the compound.
In this case, being the atomic mass:
Ba: 137.34 g/moleN: 14 g/moleO: 16 g/moleThe molecular mass of Ba(NO₂)₂ can be calculated as:
Ba(NO₂)₂= 137.34 g/mole× 2× (14 g/mole +2×16 g/mole)
Ba(NO₂)₂= 229.34 g/mole
Then, the mass of 4.02 mol Ba(NO₂)₂ can be calculated as:
mass= 4.02 moles× 229.34 g/mole
mass= 921.9468 grams
Finally, the mass of 4.02 mol Ba(NO₂)₂ is 921.9468 grams.
Learn more:
https://brainly.com/question/13763038?referrer=searchResultshttps://brainly.com/question/12225144?referrer=searchResultshttps://brainly.com/question/20486507?referrer=searchResultsthe basic unit of matter is know as a(n)
a. atom
b.cell
c. element
d. compound
Answer:
a. atom
Explanation:
When paper is burned, the mass of the remaining ash is less than the mass of the original paper.
Which statement best explains this result?
0 The ash has less volume than the paper.
O Some of the matter is destroyed during the reaction.
O The mass of the ash cannot be accurately determined.
O Some of the products of the reaction were given off as a gas.
When paper is burned, the mass of the remaining ash is less than the mass of the original paper because Some of the products of the reaction were given off as a gas.
The postulate of the law of conservation of mass is that mass can not be created or destroyed rather it can be transformed from one form to another.
This means that when ash is left behind after burning paper, the total mass should be the same as was obtained before combustion but it rather weighs less than paper itself. This should never be interpreted to mean that mass was "lost".
Here is what happens, paper is an organic material and burning it in air yields CO2 gas which escapes into the atmosphere. This explains why; when paper is burned, the mass of the remaining ash is less than the mass of the original paper.
Learn more: https://brainly.com/question/13048470
Please Help ASAP! View Attached Pictures. I don't understand this.
Answer:
Answers with the explanation.
Explanation:
Surprisingly all of the answers were C for some reason:
14. C (Extensive Properties include mass, volume and length)
15. C (Boiling/Melting/Freezing point are examples of physical change)
16. C (Malleability is how bendable an object is, therefore a physical change)
17. C (For Example, Water only forms Water Vapor when it´s heated up)
Answer:
1.F
2.A
3.C
4.E
5.B
6.D
7.B
8.F
9.A
10.E
11.D
12.C
13.B
14.C
15.C
16.C
17.C
Explanation:
Use the periodic table to select the element that best fits each of the following descriptions. Halogen:
fluorine
scandium
hydrogen
answer is fluorine
Answer: fluorine
Explanation:
Answer:
fluorine on edge 2020
Explanation:
hope this helped:)
Which of the following statements incorrectly describes the assumptions of the kinetic molecular theory? Group of answer choices The particles that make up a substance have differing amounts of kinetic energy. Matter is composed of very small particles. Based on the state of matter a substance is in, it has varying particle arrangement. Particles stop moving completely when they are very cold.
Answer: B- Matter is composed of very small particles.
Explanation:
a. The particles that make up a substance having different amounts of kinetic energy.
b. Matter is composed of very small particles.
c. Based on the state of matter a substance is in, it has varying particle arrangement.
d. Particles stop moving completely when they are very cold.
The assumptions of KMT:
- Molecules are in constant random motion.
- They undergo elastic collisions; other than collisions.
- Particles do not interact with each other.
- The distance between particles is large compared to their size.
A, C, and D all have something similar to the assumptions that I have listed. B is something completely random and unrelated. (As far as KMT goes.)
Diana and Kinsey are put in charge of choosing a mascot for their basketball team. There are fifteen players on the team, but Diana and Kinsey survey only the five players on the starting lineup about their favorite mascot.
Which best describes this error in data collection?
The data are inadequate.
The data are false.
The data were recorded incorrectly.
The data cannot be reproduced.
Answer: the data are inadequate .
Explanation:
The amount of space occupied by an object is its _____.Immersive Reader
a. measurement
b. molecular arrangement
c. volume
d. Option 4
e. length
is this correct please help?
Answer:
[tex]\boxed {\tt Number \ and \ unit}[/tex]
Explanation:
The two requirements for a measurement are a number and a unit.
For example, here is a measurement:
38.6 cm
The number is 38.6 and the unit is cm, or centimeters.
Therefore, both number and unit are correct.
What is the main type of energy present in a cordless power saw?
Answer:
chemical energy
Explanation:
cordless power saw has rechargeable battery attached to it.
and we know storage energy in battery is chemical hence cordless power saw has chemical energy present in it.
When the saw is operated, the chemical energy is converted into electrical energy which causes the motor fitted in power saw to move.
Thus,
in cordless power saw
chemical energy is converted into electrical energy
electrical energy is converted into mechanical energy.
electronegativity of argon element
Answer:
argon is 18 2-8-8 since it has octet circle and fully stable you can say it has no electro negativity
Select the reason cities tended to develop at the fall line on rivers.
what do small numbers of 12,22, and 11 stands for in C12H22O11
Answer:
The number of each element in the molecule.
Explanation:
C₁₂H₂₂O₁₁ is one molecule, and it is made 3 elements carbon, hydrogen, and oxygen. There are 12 carbons, 22 hydrogens, and 11 oxygens. If these numbers were different, it would be a different molecule.
Answer the following question.
Answer:
B) The north and south Poles
Explanation:
when dealing with magnets they have a negative and Positive charge on their south and north poles. Negative attacks with positive and positive with negative so both poles on each magnet should react to each other
2. A substance that is solid, has a shiny orange color, conducts electricity well, and melts
when heated could MOST likely be classified as ?
Answer: Aluminium
Explanation:
The metals are solid substances, they have shiny luster, they conduct electricity and have high melting point. The aluminium is a kind of metal that have a solid surface, it has a shiny luster, the surface of metal appears to be polished. It conducts electricity and can be used in electrical cords, connections, and devices. It has a high melting point.
if two group in the game are exirting equal ad opposite force the rope,will the rope move?
Answer:
No.
Explanation:
If the forces are acting on opposite direction, they will cancel out each other. As a result, the object will not move. This type of force is called balanced force. In this type of force the net force acting on an object is equal to 0. Hence, if two groups in the game are exerting equal and opposite force, the rope will not move.
I don’t know how to do thos
Answer:
75,000,000,000,000,000,000
Explanation:
7.5e+19 (7.5*10^19)
1)The thermostat on your hot water heater is raised 2 degrees celcius. If your hot water heater holds 400,000g of water, how much heat energy is used up to heat the tank?
2) The temperature of 50g of water was raised to 60c by the addition of 1.5 kJ of heat energy. What was the initial temperature of the water?
3) How much heat is released when 23.00g of water vapor condenses in a cloud to form raindrops?
4) How many joules of heat energy did the sun provide, of a 150 g patch of ice is melted
Explanation:
7erhsigusiskjkurfnkldowustehwoostfsjsozdtshalsoxttensiuxdnslc icy rbkedlxt
2. Predict which food sample you think has the most stored energy
Explain.
Type your answer here.
TT
B 1
IC
Answer:
carbohydrate yam rice
Please can i have help on these two multiple choice questions.I’ll be so grateful!!!
Answer:
1(neutrons) 2(protons)
Explanation:
which character of Life distinguishes a fire and a flowering plant
Answer:
a flowering plant needs water while a fire doesn't.
That what I guessed???
The explanation that includes scientific principles (key concepts) is the...
A. Claim
B. Evidence
C. Reasoning
Answer:
B. Evidence
Explanation: