Answer:
12
Explanation:
The number of nearest neighbors (atoms that make contact) around each atom in a face-centered cubic lattice of a metal is
12.
This is because in a face centered cubic lattice ,there are ions found at the center of each of the six faces which are usually packed together and in close contact with one another.
4. What is valency? Explain different types of
valencies
Answer:
Valency is the combining power of an element.
There are two types of valency - Electrovalency and Covalency.
Electrovalency: It is equal to the number of electrons lost or gained by atom to form ion.Covalency: It is the number of electron taking part in the formation of shared pairs.Hope it helps!<3
Place the following in order of increasing X-Se-X bond angle, where X represents the outer atoms 7) in each molecule. SeO2 SeCl6 SeF2
A) SeF2 SeO2< SeCl6
B) Seo2
C) SeF2 < SeCl6 SeO2
D) SeCl6 < SeF2 Se02
Answer:
SeCl₆ < SeF₂ < SeO₂
Explanation:
To determine the order of the bond angle of the compound, we need to determine the hybridization of each compound given.
For:
SeO₂, The hybridization is sp² because the Se is doubly bonded to O at both sides and Se contains a lone pair of electrons.
SeCl₆, Se is attached to six different Cl atoms via a single bond in a hexagonal shape. Thus, SeCl₆ hybridization is sp³d²
SeF₂, Here, Se is singly bonded to F atoms on both sides and Se contains a lone pair of electrons. The hybridization is sp³
Therefore, the bond angle in sp² = 120°, sp³ = 109.8°, sp³d² = 90°
Hence, the order is: SeCl₆ < SeF₂ < SeO₂
While exploring an ancient lava field, a geologist discovers a piece of granite that has a coating of soft, crumbling rust. What is the most likely explanation for this rust?
A.
Exposure to air has caused the iron-bearing minerals in the granite to oxidize.
B.
At some point in the past, a river flowed over the field, depositing the rust on top of the granite.
C.
Exposure to acid precipitation has worn away the granite's exterior, revealing its soft interior.
D.
Snails and fungi living in the lava field have secreted chemicals that reacted with the granite to form rust.
Answer:
A. Exposure to air has caused the iron-bearing minerals in the granite to oxidize.
Explanation:
The main cause of granite rust is a metal substance that remains in it's contact over a long period of time. As a result of a moist or wet environment, . a geologist discovers a piece of granite that has a coating of soft, crumbling rust.
Exposure to air has caused the iron-bearing minerals in the granite to oxidize.
Option A. is correct.
How does the particle motion and behavior affect how a substance appears on a macroscopic level use the term solid liquid gas state of matter and particle motion in your answer
Answer:Long-term drug abuse changes areas in the brain that affect behavior, judgment, learning and memory
Explanation:
When would sediment get deposited in a stream
Answer:
When it's gradient decreases
What happens when Magnesium hydroxide is heated? (Decomposition)
Answer:
It will make magnesium oxide and water
Explanation:
Help as soon as possible please tell why you chose A B C OR D
Answer: the answer is A
Explanation:
Iodine-131 is a radioactive material that plays a role in natural gas production and has a half-life of 8 days. A 320-mg sample of iodine-131 will decay to 250 mg after approximately days.
Time of decays approximately 2.853 days
Further explanationGiven
mass = 320mg iodine-131
No=320 mg
Nt=250 mg
t1/2 = 8 days
Required
t=time of decays
Solution
General formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]
Input the value
[tex]\tt 250=320.\dfrac{1}{2}^{t/8}\\\\log\dfrac{25}{30}=t/8.log~0.5\rightarrow t=2.853~days[/tex]
Write a balanced chemical equation describing the oxidation of the bromide ion by solid xenon trioxide to produce bromine liquid and xenon gas in an acidic aqueous solution. Use the smallest whole-number coefficients possible.
Answer:
6Br⁻ + XeO₃ + 6H⁺ → 3Br₂ + Xe + 3H₂O
Explanation:
First, we need to write the half-reactions:
2Br⁻ → Br₂ + 2e⁻ Oxidation -Balanced yet-
XeO₃ → Xe Reduction
To balance the reduction in acidic aqueous solution we need to add waters in the other side of the reaction as oxygens are present:
XeO₃ → Xe + 3H₂O
And H⁺ as hydrogens from water we have:
XeO₃ + 6H⁺ → Xe + 3H₂O
To balance the charge:
XeO₃ + 6H⁺ + 6e⁻ → Xe + 3H₂O Reduction -Balanced-To cancel out the electrons of both half-reaction we need to multiply oxidation 3 times:
6Br⁻ → 3Br₂ + 6e⁻
XeO₃ + 6H⁺ + 6e⁻ → Xe + 3H₂O
And the balanced reaction in acidic aqueous solution is the sum of both half-reactions:
6Br⁻ + XeO₃ + 6H⁺ → 3Br₂ + Xe + 3H₂OWhich statement summarizes the law of superposition? A. The oldest rock is found in the bottom layer of a rock formation. B. The rarest elements are found in the lowest layer of a rock formation. O C. The densest layer of rock in a rock formation is the bottom layer. D. The top layer of rock in a rock formation is the oldest. SUBMIT e
Answer:
A superposition says that the newest rocks are nearer to the surface and oldest are near the bottom
Answer:
A.
Explanation:
1. Which of the following is one impact that volcanoes had on the early earth?
A. Volcanoes had no impacts on planet earth but they are pretty and fun to learn about
B. Volcanoes released carbon dioxide into the atmosphere and this allowed for the evolution of oxygen-
breathing life forms
C. Volcanoes released oxygen into the atmosphere and this allowed for the evolution of oxygen-breathing
life forms
D. Volcanoes absorbed water vapor from the atmosphere and made the planet very dry and difficult to live
on
Answer:
B. Volcanoes released carbon dioxide into the atmosphere and this allowed for the evolution of oxygen-
breathing life forms
Explanation:
Volcanoes are a major source of carbon dioxide and global warming
Volcanoes absorbed water vapor from the atmosphere and made the planet very dry and difficult to live on, the impact that volcanoes had on the early earth.
What is volcanoes ?A volcano is a crack in a planet's crust, such as the one on Earth, that permits hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Most volcanoes on Earth are located underwater, and they are most frequently found where tectonic plates are diverging or convergent.
The tectonic plates are drifting apart along constructive plate boundaries. To open a fresh passageway for rising hot magma to move on to the surface, the Earth's crust is split apart.
Volcanoes erupt with a tremendously destructive mixture of ash, lava, hot, toxic gases, and rock. Explosions from volcanoes have claimed lives.
Thus, option D is correct.
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Which of the following factors affect the rate of weathering in an area?
A.
climate
B.
topography
C.
rock composition
D.
all of the above
Answer:
D
Explanation:
pretty sure D
The only naturally occurring isotopes of nitrogen are N-14 and N-15.
Based on the atomic mass of the element nitrogen on the Periodic Table, compare the relative abundances of the naturally occurring isotopes of nitrogen
Answer:
Isotope N–14 = 99%
Isotope N–15 = 1%
Explanation:
Let isotope A be N-14
Let isotope B be N-15
From the question given above, the following data were obtained:
For isotope A (N-14):
Mass of A = 14
Abundance of A = A%
For isotope B (N-15):
Mass of B = 15
Abundance of B = (100 – A%)%
Atomic mass of nitrogen = 14.01 amu
Thus, we can obtain the relative abundances of the naturally occurring isotopes of nitrogen as illustrated below:
Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]
14.01 = [(14 × A%)/100] + [(15 × (100 – A%)/100]
14.01 = 0.14A% + 0.15(100 – A%)
14.01 = 0.14A% + 15 – 0.15A%
Collect like terms
14.01 – 15 = 0.14A% – 0.15A%
– 0.99 = – 0.01A%
Divide both side by – 0.01
A% = – 0.99 / –0.01
A% = 99%
Abundance of B = (100 – A%)%
Abundance of B = (100 – 99)%
Abundance of B = 1%
Thus, the relative abundances of the naturally occurring isotopes of nitrogen are:
Isotope N–14 = 99%
Isotope N–15 = 1%
Why the value of kf is greater than kb?
Answer:
Kf being the depression of freezing point constant in the equation:
change in temperature = Kf * molality
Kb being the elevation of boiling point constant in the equation:
change in temperature = Kb * molality
the constant is variable for each solvent.
Explanation:
How many joules are needed to change the temperate of 22g of water from 18°C to 33°C?
Answer:
Q = 1379.4 J
Explanation:
Given data:
Mass of water = 22 g
Initial temperature = 18°C
Final temperature = 33°C
Heat absorbed = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of water is 4.18 J/g. °C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 33°C - 18 °C
ΔT = 15°C
Q = 522 g ×4.18 J/g.°C× 15°C
Q = 1379.4 J
How can you avoid the formation of a supersaturated solution?
How to make super saturated solution?
An aqueous solution can be rendered supersaturated by first dissolving the solute in water at an elevated temperature using enough to give a concentration just under its solubility at that temperature. After the last of the solute crystals have dissolved the solution is cooled.
Answer:
By adding water i guess
2.
Which provides evidence for evolution?
A. modern organisms closely resembling fossils
B. different animals developing with the same patterns
C. multiple species growing in very different ways
D. different animals having very different body structures
Answer:
A. modern organisms closely resembling fossils
Explanation:
Fossils are defined as the preserved remains or traces of living organisms from past.
Fossils are considered as an evidence for evolution because they represent the existence of life on earth and shows the difference between the life in past that life on earth today. With the help of fossil, it is easy to determine the age of fossils which further help to determine that how modern organisms have evolved from the past.
Hence, the correct answer is "A. modern organisms closely resembling fossils".
25% While standing in line, a student notices that some students are really tall, some are approximately her height, and others are very short. From her observations, what could be a logical inference for the variations in height? A The tall students are taking growth steroids. B The short students are not eating the proper foods. с The height of the students is inherited from their parents. D The height of the students cannot be determined from the observations. 9 > E
Answer:
b
Explanation:
the answere is b
7.
Which characteristic is comaon of developing countries?
A
B
C
D.
Slower growth rate
longer life expectancy
lower fertility rate
higher infant mortality
Slower growth rate is common characteristic of developing countries. Therefore, the correct option is option A.
What is developing countries?A sovereign state that is considered to be developing has a less developed industrial base with an HDI that is lower than other nations. This term is not generally accepted, though. Furthermore, there is no consensus on which nations fall into this category.
Although the phrase "low and middle-income country" (LMIC) is sometimes used synonymously, it only relates to the economies of the nations. In accordance with gross national income per capita, the World Bank divides the world's economy into four categories: high, upper-middle, lower-middle, as well as low income countries. Slower growth rate is common characteristic of developing countries.
Therefore, the correct option is option A.
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complete the sentence using oxalate, oxic or oxide
A binary ionic compound with the formula Feo
would be named iron(II)_____
Answer: oxide
Explanation:..
HELP PLEASE I NEED HELPPPPPPPPPPPPPPPPPPPPPPPPP
Answer:
B.
Explanation:
If it's coming from the south and pushing it north then it'll speed up the marble
1. True or false ? Balanced forces cause a change in motion. How do you know this ?
2. True or false ? Unbalanced forces cause a change in motion? How do you know this ?
Answer:
1. False
Balanced forces would mean all forces acting upon an object would be equal. So there is no movement.
2. True
Unbalanced forces would mean there is a force acting upon a side of tge object, causing it to move in a direction.
7. Explain why ethylated spirit at room temperature when dropped at the back of the palm makes
the palm to feel very cold.
(2 Marks)
Answer:
Evaporation is very important in the cooling of surfaces. If we put a drop of methylated spirit on our hand the methylated spirit will soon evaporate and our hand feels cold. The molecules of methylated spirit get the energy they need from our hand, leaving the molecules of the hand with less energy and so colder.
The ethylated sprit starts to evaporate from our hand. Evaporation is an endothermic process thus, absorbs the heat energy from our hand make the surface cool.
What is an endothermic process?An endothermic process is the one which absorbs energy from the surroundings to proceed. Thus, an endothermic process make the surroundings cool and make the reaction system hot.
The process which evolves heat energy is called an exothermic process. An exothermic reaction make the surroundings hot sometimes leads to explosion.
Evaporation is the process of conversion of a liquid substance into vapor form. This process needs energy to intake. Hence during evaporation, the heat energy is absorbed from the surroundings make there cool. This is just happening on our hand when sprit evaporates.
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This giving, (or receiving or sharing) of electrons is called a bond.
So the bigger atoms (at the bottoms of Groups 1 and 2) in the first groups of the Periodic Table lose their outer electrons more easily forming bonds with nonmetals. This kind of bond is called an ______________ bond.
Answer:
Covalent bond
Explanation:
I am pretty sure this is the answer
What is the speed of a car that moves 12 meters in 3 seconds? (Don't forget the unit!)
Answer:
8.9 mph
Explanation:
Middle School Science help please. ill give brainliest
Answer:
its c
Explanation:
what is the difference between cell and cellmembrane
Answer:
So, a cell, in easiest terms, is "the building blocks of life". Without cells, humans, plants, animals, and anything else that has a cell would not be able to survive. Cells are extremely important to our bodies. Whereas a Cell Membrane is an organelle inside a cell. The Cell Membrane's job is to provide protection for the cell, as well as deciding which substances can enter and exit the cell.
I hope this helps!
What is the percentage of the actual yield of the reaction of 2.5 mol of Fe(NO3),
with 3.6 mol of Na2Co3, to form 6.3 mol of NaNO3 according to the reaction :
2Fe(NO3)3 + 3NaC03 - >
Fe2(CO3)3 + 6NaNO3 ?
Answer:
Percent yield = 87.5%
Explanation:
Given data:
Number of moles of Fe(NO₃)₃ = 2.5 mol
Number of moles of Na₂CO₃ = 3.6 mol
Actual yield of NaNO₃ = 6.3 mol
Percent yield of NaNO₃ = ?
Solution:
Chemical equation:
2Fe(NO₃)₃ + 3Na₂CO₃ → Fe₂(CO₃)₃ + 6NaNO₃
now we will compare the moles of both reactant with NaNO₃.
Fe(NO₃)₃ : NaNO₃
2 : 6
2.5 : 6/2×2.5 = 7.5
Na₂CO₃ : NaNO₃
3 : 6
3.6 : 6/3×3.6 = 7.2
Theoretical yield of NaNO₃ is 7.2 mol.
Percent yield:
Percent yield = actual yield / theoretical yield ×100
Percent yield = 6.3 mol / 7.2mol ×100
Percent yield = 87.5%
In which food or drink are the particles most likely moving the fastest? Answers they gave to us: popsicle, cheese, a drink, Coffee. Please help me please i will give you a 5 star.
Answer:
Coffee
Explanation: When a liquid is warm the particles move faster
What is the differecn between Clo2 And Clo-2
Answer:
- ClO₂: it is chlorine dioxide.
- ClO₂⁻: it is the chlorite ion.
Explanation:
Hello!
In this case, since Cl stands for chlorine and O stands for oxygen, being the first compound an oxide and the second one an ion, we can reason:
- ClO₂: it is chlorine dioxide and as its name indicates it, it is an oxide with neutral charge, actually, a molecular compound formed by one chlorine atom and two oxygen atoms.
- ClO₂⁻: it is the chlorite ion in which chlorine has +3 as the oxidation state and therefore it is not neutral but negative as it is ready to bond with a positive ion (cation).
Best regards!