Which phrase describes a nuclear chain reaction?(1 point)
a reaction in which particles spontaneously emit radiation
a series of reactions in which particles from one reaction trigger the next reaction
a type of reaction which only takes place in the sun and other stars
a reaction in which small nuclei combine into a larger nucleus
Answer:
a series of reactions in which particles from one reaction trigger the next reaction
Explanation:
cause thats a chain
Calculate the following:
[6.6 x [tex]10^{-2}[/tex]] - [6.6 x [tex]10^{-3}[/tex]]
which statement best describes a way in which society affects the development of technology?
A. New vaccines can eliminate many diseases that are deadly to humans.
B. As the price of electric cars decreases, more people are able to afford them.
C. People can live longer, healthier lives through advancements in medicine.
D. Concerns about air pollution have caused car companies to develop more electric cars.
Answer:
C. People can live longer, healthier lives through advancements in medicine.
Explanation:
Найти массу фтора, который понадобится для взаимодействия с 0.5 г водорода. Образуется фтороводород. 2. Найти объем сероводорода, который прореагирует с 5, 6 г гидроксида натрия.
Answer:1) 9,5 грамм
2) 1,8 л вроде
Explanation:
1) H2+F2=2HF
n(H2)=1 моль. n(F2)=1моль
M(H2)=1г/моль. М(F2)= 19г/моль
0,5:1=х:19.
2) H2S+2NaOH=2H2O+Na2S
M(H2S)= 34г/моль. М(NaOH) =40г/моль
5,6:80=х:34. m(H2S)= 2,38г.
n(H2S)= 2,38:34≈0,08
V=Vm•n= 22,4 • 0,08=1,8
A. An element with the valence electron configuration 4s2 would form a monatomic ion with a charge of ____. In order to form this ion, the element will (lose/gain) (#) electron(s) from/into the ____ subshell(s).
B. An element with the valence electron configuration 2s^2 2p^4 would form a monatomic ion with a charge of ____. In order to form this ion, the element will (lose/gain) # electron(s) from/into the ____ subshell(s).
Answer:
A. 4s subshell.
B. An element with the valence electron configuration 2s² 2p⁵ would form a monatomic ion with a charge of -1.
In order to form this ion, the element will gain 1 electron into the 2p subshell
A) The element with 4s² configuration form a monatomic ion with a charge of +2 and the element will lose electrons from the 4s subshell.
B) The element with 2s²2p⁴ configuration form a monatomic ion with a charge of -2 and the element will gain electrons into the 2p subshell.
What is a valence electron?Valence electrons are the electrons occupying the outermost shell of an atom while the electrons in the inner shell are called core electrons. Lewis structures are helpful to determine the number of valence electrons and knowing the types of bonds.
Valence electrons are filled in different shells and these electrons are caused interaction between atoms and lead to the formation of chemical bonds.
Only electrons present in the outermost shell can contribute to the formation of a chemical bond or a molecule and decide the reactivity of the element.
The element with a 4s² configuration forms a monatomic ion as it loses both electrons present in the 4s subshell. This will lead to a charge of +2 on the element and the element from a monoatomic ion with +2 charge.
The element with 2s²2p⁴ configuration will accept two electrons into the 2p subshell. So that it can get the nearest noble gas configuration and it will form a monoatomic ion with -2 charge.
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True or false: Each element has a specific number of protons in the nucleus.
Answer:
This is true. Each element has a specific number of protons in the nucleus. This also means the electrons of that usually element are the same.
Explanation:
The given statement exists true. The number of protons in each element varies. The number of protons in the nuclei of any one of an element's atoms is the element's atomic number. The mass number of an atom is the sum of the protons and neutrons in the atom.
What is the number of protons in the nucleus of an atom of an element?The atomic number of an atom refers to how many protons it contains (Z). This number is crucial because it is exclusive to the atoms of a particular element. Every element has a different number of protons in its atoms, but every element has the same number of protons in all of its atoms.
Atoms with a specific number of protons in their nuclei—known as the atomic number—are what make up a chemical element. The number of neutrons in an element's atoms can vary; atoms with different numbers of neutrons are referred to as the element's different isotopes.
Every element contains a different number of protons. The atomic number of an element is the total number of protons in all of its atoms. An atom's mass number is calculated by adding its protons and neutrons.
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an element which forms an oxide that is a reactant in photosynthesis
(period 2)
Answer:
carbon dioxide gas
Explanation:
carbon dioxide gas is an element which forms and oxide that is a reactant in photosynthesis.
Answer:
Carbon dioxide
Explanation:
PLEASE MARK AS BRAINLIEST!!!!!Calculate the length between the following points using the distance formula
(1,6) and (7,14)
Length:______
Answer:
If i have 2 apples and 6 bannanas how many ansers do i get for 7xy
Explanation:
6.4
You Do 3: How many weeks are there in 3.87 x 10 minutes?
How many grams of water can be produced with 45.67 grams of ammonium?
Answer:
0.04567
Explanation:
PLEASE HELP! WILL GIVE BRAINLIEST!!!! match the terms on the left with the terms on the right.
Answer: 28. A
26. E
23. C
Explanation:
Only know a couple sorry
Density measures
A
how much liquid is in an object.
B
the amount of space an object takes up.
C
how tightly packed an object’s particles are.
D
the amount of matter contained in an object.
Answer:
A IS DISPLACEMENT
B IS VOLUME
C IS DENSITY
D IS MASS
why a mixture of magnesium hydroxide and water is known as milk of magnesia
because of its milk-like appearance. ... Since the dissociation of this small amount of dissolved magnesium hydroxide is complete, magnesium hydroxide is considered a strong electrolyte. Its low solubility makes it a weak base.
(BRAINLIEST FOR CORRECT AND BEST EXPLAINED ANSWER) What properties distinguish solids, liquids, gases, and plasma from each other?
Answer:
Here's a pretty short answer :D
Explanation:
Solids have definite volume and shape, liquids have definite volume but take the shape of their containers unlike solids. Gases don't have definite shape or volume, and plasma is somewhat gas because its particles are far apart from each other - but - gases are electrically neutral while plasma has a charge.
.
.
.
Hope this helped! :3
How much heat is required to raise the temperature of 86.5g of water from its melting point to its boiling point
Explanation:
Assuming that pressure is equal to
1 atm
, boiling water at its boiling point implies providing it with enough heat to turn it from liquid at
100
∘
C
to vapor at
100
∘
C
.
The amount of heat needed to allow one mole of water to undergo this phase change is called the enthalpy chnge of vaporization,
Δ
H
vap .For water at
100
∘
C
, the enthalpy change of vaporization is equal to
Δ
H
vap
40.66 kJ/mol
how far is the subduction zone from manila
Answer:
At 22°N, a low-velocity zone is exposed at depths of 20–200 km beneath the Manila Accretionary Prism, which could be the boundary between subduction in the south and collision in the north
[tex]\huge\bold\red{{HELP}}[/tex]
Answer:
Question 1:
• In A, the main carbon has four bonds [two double bonds ] i.e; (=C=) hence it cannot allow any incoming electron. This makes it thermodynamically stable because it's reactivity carbon is fully bonded.
In B, the main carbon has only three bonds i.e;
(=C–) hence it will allow only one pair of incoming electrons hence reaction taking place.
Question 2:
Note: Any halo-alkane or alkyl-halide such as methyl iodide, methyl chloride, ethyl bromide are reagents used to add alkyl groups to amide molecules.
• So, Methyl Iodide will not react with C because C lacks an amide or nitrile group. To add an alkyl group to C, we shall use potassium hydroxide and any alcohol in presence of dry ether at room temperature.
• Methyl Iodide will react with D because D has an amide group which is electron efficient hence reaction will take place so easily.
Question 3
Note: Nucleophiles are electron donating molecules.
Electrophiles are electron recipients.
• F will react with nucleophiles because F has a carbonyl group i.e; (–HC=O ) which is an electron recipient. But this occurs after the oxygen atom reacting with an hydroxide to form an oxide.
E will not react, because the main carbon has a double bond which are nucleophiles.
[tex].[/tex]
PLEASE HELP, I REALLY NEED HELP WITH THIS!!!
Answer:
Explanation:
There are 6 32S atoms and 2 36S atoms
Their respective contributions to the average aomic mass is (6*32)=192, and (2*36)=72. Added together, this makes 264 total. Divide by the total number of atoms, 8. (264/8) = 33.00
The weighted atomic mass of these S atoms is 33.00 amu (atomic mass units)
when a bond breaks, what is true of the overall potential energy and kinetic energy of the electrons?
Answer:
a potential energy decreases, kinetic energy does not change b potential energy decreases, kinetic energy decreases c potential energy increases, kinetic energy does not change d potential energy decreases, kinetic energy increases e potential energy does not change, kinetic energy decreases f potential energy increases, kinetic energy decreases g potential energy increases, kinetic energy increases h potential energy does not change, kinetic energy increases
Explanation:
Scientists have discovered a healthy coral reef at the mouth of the Amazon River. Which statements about the coral reef are accurate? Select the two
correct answers. (1 point)
-The biodiversity of the reef differs depending on location
-The corals in the reef die in muddy waters.
-The biodiversity of the reef is uniform throughout
-The corals in the reef are able to survive even in muddy waters.
i think the answer is A and D
The biodiversity of the reef depends upon the location and corals die in the muddy water.
Coral reef:
These are the ecosystem of sallow water in the oceans. They made by reef building corals. It is one of the most diverse ecosystem.
The muddy water decrease the availability of the sunlight to the algae that provide food to the corals, thus corals die in the muddy water.The diversity of the reefs depends upon the location as increasing depth decrease the availability of the sunlight.Therefore, the biodiversity of the reef depends upon the location and corals die in the muddy water.
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The temperature at which a material changes from a solid to a liquid is called the
Answer:
it is called melting point
The equation that shows the relationship between speed, wavelength, and frequency of electromagnetic waves is
Answer:
c = λ f
c is the speed of light, λ the wavelength in meters, and f equals the frequency in cycles per second.
Explanation:
True or false: The subatomic particles in an atom do not move. *
Answer:
True
Explanation:
hope this works:)
have a nice day:)
May I have brainlist
Answer:
true he got it right
Explanation:
i just know ok
water between the atmosphere the land oceans
Answer:
the water cycle
Explanation:
it's the movement of water between the atmosphere and land oceans
Proton
Suggest why scientists will continue to look for evidence of the Higgs boson, even though in 2012
the evidence strongly suggested they had found this particle.
Explanation:
The Higgs boson was proposed in 1964 by Peter Higgs, François Englert, and four other theorists to explain why certain particles have mass. Scientists confirmed its existence in 2012 through the ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN in Switzerland.
Which statements support the student's claim that the matter and energy o
the instant hot pack are conserved even though the temperature of the
instant hot pack changed? Select the two correct statements.
The mass of the instant hot pack did not change because the
A
same amount of matter was present.
e
The mass of the instant hot pack did not change because the
total amount of energy was conserved.
Matter was conserved because it flowed from the hot pack to
С
the jar, as shown by the temperature data.
Energy was conserved because it flowed from the instant hot
D pack into the jar causing the jar to warm, as shown by the
temperature data.
The instant hot pack transferred energy as cold flowed from the
jar into the hot pack and changed the temperature of the jar,
until both were at the same temperature.
Answer:
(C) Should Be The Answer
Explanation:
5. Describe how the properties of elements in the same group differ to the properties of elements in the same period.
Answer:
(a) (i) All the elements of a group have similar chemical properties because they have the same no. of valence electrons in their outermost shell. (ii) All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.
1. Which of these electron transitions results in the emission of energy?
2.Which of these electron transitions requires the absorption of energy?
Answer:
19 - B
20 -C
Explanation:
what is the bond formation of Fe and Cl
Answer:
Electrovalent/ Ionic bond is formed between Fe and Cl
An atom has a proton number of 6 and nucleon number of 11. How many neutrons does it have?
Answer:
number of neutrons= nucleon number - proton number
11-6=5