Answer:
Spontaneous and random. Decay is called spontaneous because the occur on their own and are unaffected by external factors like temperature, pressure, and many more. Decay is called random because we cannot determine the rate at which it decays but can only determine the probability of the decay.Oct 21, 2015
Explanation:
chemically stable than they would
14. The atoms in a water molecule are
be as individual atoms.
A Less
B. More
C. Similarly
D. Not
Answer:C
Explanation:
Which of the following is a chemical change?
melting of ice
burning of wood
breaking of glass
Evaporation of water
Answer:
The answer is burning of wood
Explanation:
just took the quiz
Which phrase best describes bronze?
a copper–tin alloy
an ionic compound of copper and tin
a pure metal
a mineral ore containing copper and tin
Answer:
a mineral ore containing copper and tin
Answer:
Copper-tin alloy
Explanation:
just took the test :D
Try it
Which statements accurately describe volume? Check all that apply.
Explanation:
what is the question jjsjmwujjduwhfjd
Answer:
Volume is a physical property of an object
One unit of volume is the milliliter
Liquids and solids have constant volumes
Explanation:
13. Examine the following table, each letter represents a piece of missing information. Below
you will be asked to identify the information to complete certain boxes Copy the letter as
showed under the table with its correct answer. (8 pts)
Name
Symbol
Protons
Neutrons
Electrons
Mass
Oxygen-16
A
18
18
8
E
Chlorine-35
B
18
17
F
35, C
To go
E
F
G
H
Oxygen-18
18
8
Chlorine-37
32, CI
17
20
D
H
Answer: i can understand it sorry
Explanation:
What type of reaction is
Mg + CI -> MgCI2?
A. Double-replacement
B. Synthesis
C. Single-replacement
D. Decomposition
most neutral atoms of argon have an atomic mass of 40 amu and an atomic number of 18. what are these atoms composed of?
A.18 protons,22 neutrons, and 22 electrons
B.18 protons 22 neutrons 18 electrons
C.18 protons 18 neutrons 18 electrons
D,18 protons 40 neutrons and 18 electrons
Answer:
B.18 protons 22 neutrons 18 electrons
Explanation:
Neutral atom of Argon;
Atomic mass = 40amu
Atomic number = 18
Let us find the number of the subatomic particles;
Protons are the positively charged particles in an atom
Electrons are the negatively charged particles
Neutrons do not carry any charges.
Now;
Atomic mass = number of protons + number of neutrons
Atomic number = number of protons
number of protons = 18
In a neutral atom, number of protons equals number of electrons
number of electrons = 18
Number of neutrons = atomic mass - atomic number
Number of neutrons = 40 - 18 = 22
18 protons, 18 electrons and 22 neutrons
Look up and compare the ionic radii of In3+, Mn3+, and Y3+ for a specific coordination number. Why do you think Mn3+ forms a solid substitution on the In3+ rather than the Y3+ site?
Answer:
See explanation
Explanation:
Substitution implies that one thing is repalced by the other.
Substitution of one ion by another largely depends on the sizes of the ions in question.
The ionic radius of Mn3+ is about 0.65 Angstroms while that of In3+ is about 0.94 Angstroms. On the other hand, the ionic radius of Y3+ is about 1.032 Angstroms.
It is clear that the sizes of Mn3+ and In3+ are closer to each other hence Mn3+ can substitute for In3+ easily than Y3+ in a lattice site.
The larger size of Y3+ explains why it is not easily replaced by Mn3+.
does anyone else simp for mhanifa?
Answer:
i dont XD
Explanation:
Answer:
no
Explanation:
PLZ HELP CHEMISTRY SUCKS BRO
Answer:
just click any of the buttons
Answer:
23535
Explanation:
ugggguguygiugiugugiyuuigiuyiugy
Question 5 of 5
Carbon has six protons. Which model shows a neutral atom of carbon?
Answer:
its d
Explanation:
Model D shows a neutral atom of carbon as it has 6 protons in the nucleus and 6 electrons in it's orbits.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
Learn more about atom,here:
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What would happen to the food chain, if all the plants were removed?
Answer: chain reaction there will be no carbon and animals who eat plants will die off
Explanation:
What is the ground-state electron configuration of O2-? A (σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)1(π2p*)1 B (σ2s)2(σ2s*)2(π2p)4(π2p*)1 C (σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2 D (σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1
Answer:
(σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1
Explanation:
In writing molecular orbital configuration, the number of valence electrons involved in the molecule are all written into various molecular orbitals in accordance with the Aufbau principle.
O2^- contains 17 electrons. Its molecular orbital configuration is KK(σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1. Recall that the inner (σ1s)2 and (σ1s*)2 is designated as KK. This inner shell does not take part in bonding. The bond order in O2^- is 1.5.
The ground state electron configuration of O2- is Choice C: (σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2
Discussion:
The molecular orbital configuration is dependent on the number of electrons involved in the molecule.
These are all written into various molecular orbitals as described in the Aufbau principle of electron configuration.
Since O2 contains 16 electrons, when it gains an electron to become O2-;
O2^- contains 17 electrons.
Its molecular orbital configuration is;
KK(σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2.It is noteworthy to remember that the inner (σ1s)2 and (σ1s*)2 are represented as KK. This inner shell does not take part in bonding.
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An atom of which element has the strongest attraction for electrons in a chemical bond?
A) chlorine
B) nitrogen
C) oxygen
D) selenium
Answer:
Fluorine. This element has the greatest electronegativity value, so has the greatest attraction to electrons in a bond.
Explanation:
The atom of element with the strongest attraction for electrons in a chemical
bond from the options is Chlorine.
The element with the strongest attraction for electrons in a chemical bond is
the most electronegative element.
The electronegativity of an atom is the tendency of an atom to attract
bonding pairs of electrons.
Generally, electronegativity of an element increases across the period. The
electronegativity of an element also decreases down the group. The most
electronegative element is fluorine.
Halogen group are naturally electronegative.
Therefore, the most electronegative element in the option is chlorine and its
the element that has the strongest attraction for electrons in a chemical
bond.
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When determining molecular polarity, which scenario is not possible:
A A polar molecule with polar bonds
B A nonpolar molecule with polar bonds
с A polar molecule with nonpolar bonds
D A nonpolar molecule with nonpolar bonds
Answer: Option C is correct
A polar molecule with nonpolar bonds
Explanation:
A polar molecule with nonpolar bonds cannot be polar because a polar molecule has net dipole that it has one end slightly positive and the other end slightly negative which allows the distribution of atoms .
Therefore it cannot have non polar bonds because non polar bonds allow electrons to be shared equally and it take place between non elemental substances or substances that are not elements , it cannot occur in elemental substances because these substances have different electronegativities which can be held by polar bonds alone.
Answer:
The correct answer is C. A polar molecule with nonpolar bonds
Explanation:
Polarity is the property of a molecule of having a dipole moment. Based on this, a molecule can be polar -with dipole moment- o nonpolar. The polarity of a molecule is determined by:
- the presence of elements with differences in electronegativity which results in polar bonds.
- geometry of the molecule
Polar bonds are vectors and if they are opposite (equal in magnitude with opposite direction) so they are cancelled out. A polar molecule must have polar bonds, buy they can be cancelled out by opposite positions in the molecule geometry. For example, CO₂ (carbon dioxide) has polar bonds C-O because they are composed by elements with different electronegativities, but the molecule is linear so the two bonds C-O are cancelled out and the molecule is nonpolar.
Therefore, from the options, the only non possible scenario is C - a polar molecule with nonpolar bonds - because polar molecules always have polar bonds. The opposite situation can be true: a non polar molecule wiith polar bonds as we saw in the example of CO₂.
a car starts from rest gains velocity 20m/s in 10 second find its acceleration?
Answer:
acceleration(a)=2m/s²
Explanation:
initial velocity(u)=0m/s
final velocity (v)=20m/s
time taken (t)=10sec
now
v=u+at
20=0+a*10
a=2m/s²
What side is the products
HELP ME with THIS I am time i have a little bit of time and still have more questions !!! CHEMISTRY!!
Answer:
1. is B 2. is C or B
Explanation:
If you have 0.95 moles of FeCl3, how many moles of MgCl2 do you produce in the reaction
FeCl3 + Mg --> MgCl2 + Fe?
I REALLY NEED HELP PLEASEEEEE
What is the energy of a photon having a wavelength of 2.60 ✕ 10-8 m?
J
The energy of a photon : 7.645 x 10⁻³⁴ J
Further explanationRadiation energy is absorbed by photons
The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
f = c / λ , Hz
c = speed of light
= 3.10⁸ m/s
λ = wavelength ,m
wavelength λ of 2.60 ✕ 10⁻⁸ m
The energy :
[tex]\tt E=h.\dfrac{c}{\lambda}\\\\E=6.626.10^{-34}\times \dfrac{3\times 10^8}{2.6\times 10^{-8}}\\\\E=7.645\times 10^{-34}~J[/tex]
How long would it take for a sample of 222 Rn that weighs 0.750 grams to decay to 0.0469 grams, assuming the half-life of 222 Rn is 3.82 day
Answer:
Formula we will be using:
(i) ,
where
Final quantity
Initial quantity
t=time ( same unit as that of half-life)
n=half-life
-------------------------------------------------------------
Given,
Final quantity ==0.100g
Initial quantity==0.750g
Time= t(unknown)
Half-life=n=3.823 days
Plug in the above values in the formula:
Divide both sides by 0.750:
Taking natural long on both sides:
Applying
Dividing both sides by ln(0.5):
Multiplying both sides by 3.823:
11.113=t
t=11.113
It would take 11.113 days
Answer : 11.113 days
Explanation:
Why is fingerprint identification considered a science?
Answer:
Forensic scientists have used fingerprints in criminal investigations as a means of identification for centuries. Fingerprint identification is one of the most important criminal investigation tools due to two features: their persistence and their uniqueness. A person's fingerprints do not change over time.
Explanation:
How is the crust and the inner core alike
Answer:
They are both solids
Explanation:
I had to answer that question a long time ago hope this helps.
What type of heat transfer do
dryers use?
Forced convection
Forced radiation
Answer:I believe it forced convections
Explanation:convection is the circular motion that happens when warmer air or liquid makes something less dense.
Answer:
how y'all doinnn
Explanation:
byyeee
A substance that is composed only of atoms having the same atomic number is classified as
which is the correct answer??
Answer:
1
Explanation:
The diagram models how gravity works in our solar system. The sizes of the spheres are directly
proportional to their masses. The sizes of the arrows are directly proportional to force.
In what way does this diagram accurately model gravity in our solar system?
Ο Α.
by demonstrating that the force of gravity is a constant
by demonstrating that the sun controls the way that gravity affects interactions among
other bodies in the solar system
ОВ.
OOI
by demonstrating that gravity requires three or more bodies interacting with forces of
different magnitudes
by demonstrating that the strength of the force of gravity is dependent on the masses of
objects and the distance between them
OD
Answer:
by demonstrating that the strength of the force of gravity is dependent on the masses of objects and the distance between them
Explanation:
The model correctly proves gravity by demonstrating that the strength of the force of gravity is dependent on the masses of objects and the distance between them.
To model gravity, we need the mass of the objects and the distance between them.
According to Newton's law of universal gravitation "the force of gravity between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them" .
can someone pls help me with this!
Answer:
weathered rock and deceomposed material
Explanation:
What is a radical?????
Answer:
radical dudes
Explanation:
Answer:
relating to or affecting the fundamental nature of something; far-reaching or thorough.
Explanation:
Balance the foll. equations
Answer:
naf+so2+nho3
Explanation:
beacause sodium is main solution in this equation
Answer:
e) P + O2 → P2O5
balanced equation
4P + 5O2 → 2P2O5
f) NaCl + F2 → NaF + Cl2
balanced equation
2NaCl + F2 → 2NaF + Cl2
g) K + MgBr2 → KBr + Mg
balanced equation
2K +MgBr2 → 2KBr +Mg
h) Mg + O2 → MgO
balanced equation
2Mg + O2 → 2MgO
i) Al + O2 → Al2O3
balanced equation
4Al + 3O2 → 2Al2O3
hope this helps you!
