Answer:
A chemical change is required to separate the elements present in it.
Explanation:
The only true statement from the choices given is that water as a pure substance requires a chemical change to separate the elements present in it.
Water is a molecule consist of two atoms of hydrogen and one atom of oxygen.
The atoms are covalently bonded together. A chemical process, the electrolysis of water is often used to separate the atoms of a water. Physical changes cannot be used to separate the atoms of water. Water is a compound which consists of two elements.Therefore, we see that only the first choice satisfies this problem.
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
The model represents a
Answer:
i think you forgot to add a picture
Gold atoms can be identified based on the number of which subatomic particles?
A. Protons
B. nuclei
C. electrons
D. neutrons
Answer:B
Explanation:
What is the mass of 4.2 x 10^24 molecules of Ca(OH)2
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=searchResults3. 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
Metallic bonds have what that are freely flowing in a sea
Answer:
tRUE
Explanation:
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
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...
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.
Select the reason cities tended to develop at the fall line on rivers.
The explanation that includes scientific principles (key concepts) is the...
A. Claim
B. Evidence
C. Reasoning
Answer:
B. Evidence
Explanation:
what is the oxidation number of Pb(NO3)2
Answer:
+2
Explanation:
The nitrate ion is a radical with an overall charge of -1. To get the oxidation number of lead, add up all the oxidation numbers and equate to zero. Therefore the oxidation state of lead is +2.
Answer:
+2
Explanation:
looked it up
The amount of space occupied by an object is its _____.Immersive Reader
a. measurement
b. molecular arrangement
c. volume
d. Option 4
e. length
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.
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.
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?
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
what is the heat of reaction H2 + 1/3N2 2/3NH3
11. Which element forms an ionic compound when it reacts with lithium?
The layer of the Earth called the mantle is often described as convecting. In this context, convection is
Answer:
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
Explanation:
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:
coefficient of 3MgCl2?
Flood waters
moving soil from
one location to
another
What is it weathering, Erosion or deposition
Answer:
I think the answer is EROSION because it has to do with the movement of sediment.
Explanation:
Hope this helps!
Flood waters moving soil from one location to another is called erosion.
Erosion is the process by which soil, rock, and other materials are transported from one place to another by natural forces such as water, wind, and ice.
In the case of soil being moved by flood waters, the water is the natural force that is causing the erosion. The water is carrying the soil from one location to another, which is a characteristic of erosion. Deposition, on the other hand, is the process by which eroded materials are deposited or laid down in a new location. Deposition occurs when the energy of the transporting medium (such as water or wind) decreases, and the materials being transported are no longer able to be carried.Therefore, the movement of soil from one location to another due to flood waters is an example of erosion.
Learn more about erosion here:
https://brainly.com/question/30587260
#SPJ6
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.
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
Leann is learning about chemical reactions. She wants to create a model of a chemical reaction, so she is examining the information that she should include. What are the different components that she should include in her model? Choose the three that apply.
A. the kinds of atoms that form during a reaction
B. the kinds of molecules involved in the reaction
C. the kinds of elements that make up a molecule
D. whether the molecules are products or reactants
E. whether the products have more mass than the reactants
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.
what happen when two light waves traveling from oppsite direactions meet?
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!
Which one of the following is an alkane?
A. C2H4
B. C5H10
C. C3H8
D. C4H6
Hello
Answer:
C. C3H8
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: