Answer:
Helium
Explanation:
Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus.
Which nuclear equation represents a spontaneous decay?
(1) Rn 21% Po + He
(2) 13 Al + He 18P + on
(3) 235 U + in ~ 13% Ba + Kr + 3n
(4) Li + H → He + He
a. 1
b. 2
C 3
d. 4
Answer:
a. 1
Explanation:
Radon is a member of group 18. It is an odorless heavy gas, that emanates from materials that contain uranium.
Rn is a decay product of 226-Ra, a member of the uranium decay series. The spontaneous decay of Rn decay leads to the emission of an alpha particle.
Rn has a half-life of about 3.8 days and its decay product is 218Po.
The nuclear reaction which shows a spontaneous decay is Rn 21% Po + He.
What is spontaneous reaction?
Those reaction in which value of their enthalpy change and change in Gibb's free energy is negative, are spontaneous in nature.
Among all of the given reaction, only first reaction is spontaneous in nature because the given element Radon (Rn) is the product of the decay of uranium series. And in this reaction energy is emitted in the form of alpha particles.
Hence, option (1) is correct.
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Iodine monochloride (ICl) has a higher boiling point than bromine (Br2) partly because iodine monochloride is a(n)
Answer: polar molecule.
Explanation:
The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid. The boiling point is dependent on the type of forces present.
Iodine monochloride (ICl) is a polar molecule due to the difference in electronegativities of iodine and chlorine. Thus the molecules are bonded by strong dipole dipole forces. Thus a higher temperature is needed to generate enough vapor pressure.
Bromine [tex](Br_2)[/tex] is a non polar molecule as there is no electronegativity difference between two bromine atoms. The molecules are bonded by weak vanderwaal forces and thus has low boiling point.
Describe what a geologist would observe if she poured acid on the sculpture
Answer:
A geologist would observe how the material that the sculpture is made out of reacts to the acid.
How many different elements are involved in the chemical reaction shown
Ca+2H2O>ca(OH)2+H2
Explanation:
1.ca
2.H
3.O
.................
Which has a greater ionization energy: lithium or bromine? Which has a greater ionization energy: vanadium or sodium?
What is not a mass of 1 mole of a substance?
Explanation:
been defined in such a way. It is defined as the numbers of particles in 12 g of 12C. If it were 24 g instead of 12 g, then the weight of 1 mole of substance would equal 2 times the atomic/molecular mass in grams.
Step 2: measure the area of the top of the syringe
I am unsure if this is correct, but this might be the whole section:
The top of the syringe is a circle. You need to compute its area for use in later computations of pressure values. Start by using a ruler to measure the diameter. Estimate to the nearest 0.01 cm. Answer: 3.60 cmDivide by two to find the radius. Maintain significant figures. Answer: 1.80 cmSubstitute the radius into the formula A = πr² to find the area of the top of the syringe. Maintain significant figures. Answer: 10.2 cm²HEY! Nicki Minaj is the queen of rap.
Answer:
O my OMG
Explanation:
Remember Nicki vs. Cardi
what chemical reaction type is Pb + 2 H3PO4 --> 3 H2 + Pb3(PO4)2
Answer:
single displacement reaction
Explanation:
it is because an atom(Pb) dispalces another atom(H) in H3PI4
The given chemical reaction is single displacement reaction.
What is single displacement reaction?When one element in a molecule gets replaced by another, is therefore called a single displacement reaction.
The given reaction is Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2
It can be seen that when lead is treated with H3PO4 then it will give Pb3(PO4)2 and hydrogen reaction. It is a kind of single displacement reaction.
Therefore, the given reaction is single displacement reaction.
To know more about single displacement reaction.
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Which is a statement of the second law of thermodynamics?
O A. Entropy tends to increase in a system.
O B. Molecular motion stops at absolute zero.
O C. The net reaction rate is zero at equilibrium.
O D. Energy cannot be created or destroyed.
Answer:
A: Entropy tends to increase in a system
Which is a statement of the second law of thermodynamics?
O A. Entropy tends to increase in a system.
O B. Molecular motion stops at absolute zero.
O C. The net reaction rate is zero at equilibrium.
O D. Energy cannot be created or destroyed.
ITS A
calculate the mass of a sample of cobalt containing 3.31x10^22 atoms
Answer:
Mass = 3.24 g
Explanation:
Given data:
Number of atoms of cobalt = 3.31 × 10²² atoms
Mass of cobalt atoms = ?
Solution:
We will calculate the number of moles of cobalt by using Avogadro number.
1 mole contain 6.022× 10²³ atoms
3.31 × 10²² atoms × 1 mol / 6.022× 10²³ atoms
0.549 mol × 10⁻¹
0.0549 mol
Mass of cobalt:
Mass = number of moles × molar mass
Mass = 0.0549 mol × 58.93 g/mol
Mass = 3.24 g
During the process of condensation, water vapor does what
Answer: the water molecules become more organized and heat is released into the atmosphere as a result.
Explanation:
What causes surface water to move
Answer:
C - Wind
Explanation:
its C or wind because global wind systems control the surface water
Answer:
Wind
Explanation:
surface water from oceans move from the wind I assume it is the same for all bodies of water
A small amount of solid potassium dichromate is added to water and stirred until all of the solid has dissolved and a clear orange liquid is produced. This process may be described as: Group of answer choices the formation of a heterogeneous mixture. dissolution of the molecular compound sublimation. dissolution and dissociation of the ionic compound.
Answer: dissolution and dissociation of the ionic compound.
Explanation:
Ionic compound is formed by the transfer of electrons.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here potassium metal forms [tex]K^+[/tex] cation and [tex]Cr_2O_7^{2-}[/tex] anion which exchange their oxidation states to form [tex]K_2Cr_2O_7[/tex].
When ionic compound is dissolved in water, it dissociates to its respective ions.The ions form bonds with oppositely charged ions of water molecules and thus get dissolved in water called as dissolution.
what is ionizable hydrogen and why we say it replaceable hydrogen
Answer:
only hydrogen atoms that are part of a highly polar covalent bond are ionizable. The hydrogen atom is attracted to the lone pair of electrons in a water molecule when HCl is dissolved in water. The result is that the H−Cl bond breaks, with both bonding electrons remaining with the Cl, forming a chloride ion.
Explanation:
Answer:
In an acid molecule, hydrogen atoms may be substituted by metal atoms.
Explanation:
It is ionizable only to hydrogen atoms that are part of a strongly polar covalent bond. As HCl is dissolved in water, the hydrogen atom is drawn to the lone pair of electrons in a water molecule. The effect is that the H-Cl bond splits, with the Cl remaining with both bonding electrons, forming a chloride ion.
Which object has the greatest inertia
Answer:
D
Explanation:
lighter objects have higher inertia
What does it mean when you ask your dad whats he going to do with the chikens and hes says feed them some fried chiken?
Answer:
It means your dad is making those chickens cannibal's.......
Explanation:
Answer:
Hes gonna cook those chickens.....
How many unpaired electrons are present in V3+?
Answer: two unpaired
Explanation: In general, electrons are removed from the valence-shell s-orbitals before they are removed from valence d-orbitals when transition metals are ionized. And thus, V3+ is paramagnetic, because it has two unpaired 3d-electrons.
Which statement below is not part of the cell theory? a. All living things have many cells b All living things are made of one or more cells c cells are the basic unit of structure and function in living things d All cells come from other cells
Answer:
c
Explanation:
I know it's c because I have done the test