10161.6 Lanthanum-140 can also emit beta radiation and change into cerium.
Complete the equation showing the decay of lanthanum (La) 140 into cerium (Ce).
Answers
Answer:
[tex]\frac{140}{57}La -------->\frac{140}{58} Ce +\frac{0}{-1} \beta[/tex]
Explanation:
Beta emission occurs when a neutron is converted to a proton, an electron and a neutrino. This phenomenon reduces the neutron-proton ratio(N/P).
When a beta emission occurs, the mass number of the daughter nucleus is the same as that of the parent nucleus while the atomic number of the daughter nucleus increases by one unit.
We can see this explanation above in the reaction described in the answer section.
Related Questions
An atom has the following electron configuration . 1s^ 2 2s^ 2 2p^ 6 3s^ 2 3p^ 6 4s^ 2 How many valence electrons does this atom have ?
2
3
5
11
Answers
The correct answer is 2.
Valence electrons are the electrons present in the outermost shell of the atom.
Given electronic configuration:-
[tex]1s^{2} 2s^ 2 2p^ 6 3s^ 2 3p^ 6 4s^ 2[/tex]
From the above electronic configuration, the outermost shell is the fourth shell that is [tex]4s^ 2[/tex]. The number of electrons in this shell is 2.
Hence, the atom has 2 valence electrons.
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How many moles are in 1.50 x 10^23 atoms of F?
(2 decimal places)
Answers
Explanation:
a) 0.4998 mol
b) 0.249 mol
2. Many calculations in chemistry will involve certain symbols, such as the symbol triangle or delta
What does this symbol stand for or mean?
A. "The total"
B. "The change in"
C. "The unit"
D. "The formula"
Answers
B. "The change in"
I saw that symbol a lot in chemistry and physics so I immediately recognized it.
B. The change in
When a molecule is separated into its components parts it form
A. Componds
B. Atoms
C. Protons
D. Ions
Answers
When a molecule is separated into its components it forms atoms as molecules are made up of same or different kind of atoms.
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.
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(EASY POINTS!!!!!!!!!!!!!!!)How do we change the world... one random act of kindness at a time
Answers
Answer:
less polution
Explanation:
describe the relationship between kinetic energy and mass
Answers
Answer:
Kinetic energy has a direct relationship with mass, meaning that as mass increases so does the Kinetic Energy of an object. ... Objects with greater mass can have more kinetic energy even if they are moving more slowly, and objects moving at much greater speeds can have more kinetic energy even if they have less mass
Decreases in melatonin result in decreased?
Answers
Answer:
Im going to say sleep
Explanation:
How are air resistance and friction similar?
A. They are both noncontact forces.
B. They are both types of nuclear forces.
C. They both slow things down.
D. They both work using gravity.
Answers
explain Alexander Volta law
Answers
Answer:
Alessandro Giuseppe Antonio Anastasio Volta (Italian: [alesˈsandro ˈvɔlta]; 18 February 1745 – 5 March 1827) was an Italian physicist, chemist, and pioneer of electricity and power[2][3][4] who is credited as the inventor of the electric battery and the discoverer of methane. He invented the Voltaic pile in 1799, and reported the results of his experiments in 1800 in a two-part letter to the President of the Royal Society
Elements can be described by various properties, and identified by their boiling and melting points. For example, gold melts at 1,064ºC and boils at 2,856ºC. Does boiling point depend on the mass present?
A. No; chemical properties stay the same regardless of mass.
B. No; physical properties stay the same regardless of mass.
C. Yes; physical properties can change when mass increases or decreases.
D. No; qualitative properties like boiling point stay the same regardless of mass.
Answers
Answer:
Explanation:
Melting and boiling point variations are not clear (do not have uniform pattern) in periodic table. But we can see, some elements have higher melting and boiling points and some have less. Here we study melting and boiling points of s, p, d blocks elements. IVAth group elements (C,Si) show high melting and boiling points because they have covalent gigantic lattice structures.
If the empirical formula of a compound is CH2O what is a possible molecular formula for
the compound?
A C2H4O2
B CH20
C C5H705
D CH40
Answers
Atomic Number of Francium
Answers
Answer:
Francium is a chemical element with the symbol Fr and atomic number 87. Prior to its discovery, it was referred to as eka-caesium. It is extremely radioactive; its most stable isotope, francium-223, has a half-life of only 22 minutes.
High solubility of ammonia in water what type of interaction is responsible for?
Answers
Answer:
The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).
Answer:
Hydrogen Bonding
Explanation:
The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).
Materials that allow electricity to flow through them easily are called conductors which of these would be a good conductor of electricity?
Group of answer choices
Carbon
Steel
Rubber
Plastic
Answers
5. Which contains more atoms? Circle one for each letter.
a. 12 g of hydrogen, H or 12 g of carbon, C
b. 27 g of aluminum, Al or 27 g of iron, Fe
c. 40 g of calcium, ca or 40 g of sodium, Na
d. 40 g of calcium, ca or 60 g of zinc, Zn
e. 10 g lithium, Li or 100 g of lead, Pb
Answers
Step by step explanation
īm přêþþý şúřè þhéřé ářêńț
Analyses of mutations show they only result in variations in?
Answers
Answer:
Genetic variation
Explanation:
measure of the genetic differences that exist within a population.
Hello, what forms ions with a (+) or (-) charge.
1. covalent compound
2. Ionic compound
3. Ionic and Covalent Compund
Answers
Answer:
Ionic and covalent compounds
Explanation:
for a ionic compound to form ions it loses its electrons thus having a ( +) charge
same for covalent compounds to form ions it gains electrons thus having a (-) charge
What were some of the limitations of Bohr's atomic model?
Answers
Answer:
bohr didn't mention abt sub shells that are in main shells
true or false amino acids and nucleic acids are both monomers containing nitrogen
Answers
Answer:
Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life's blueprint for all cells, and in many other organic and inorganic compounds.
Explanation:
Amino acids and nucleic acids are both monomers containing nitrogen is a true statement as both monomers have nitrogen in them.
There are four major macromolecules that are used by the body of an organism that helps in getting energy and growth and development of the organism.
1. The building blocks of DNA or nucleic acid are nucleotides:
consist of the sugar deoxyribose, a phosphate group, and one of four nitrogenous basesNitrogenous bases are adenine (A), guanine (G), cytosine (C), and thymine (T) or Uracil (U).Uracil is present in RNA onlyThese nitrogenous bases have nitrogen in their structure2. Amino acids are the building blocks of proteins:
An amino acid is an organic molecule with 3 componentsmainly consist of the Amino group (-NH2) which means nitrogen.an acidic carboxyl group (−COOH),an organic R groupThus, the correct answer is - true.
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After mixing equal amounts of the two molecules, the solution achieved equilibrium at 25 ∘ C . 25 ∘C. The concentration at equilibrium of glucose 1‑phosphate is 0.01 M, 0.01 M, and the concentration at equilibrium of glucose 6‑phosphate is 0.19 M. 0.19 M. Calculate the equilibrium constant, K eq , Keq, and the standard free energy change, Δ G ∘ , ΔG∘, of the reaction mixture.
Answers
Answer:
Keq = 19
ΔG° = -7.3kJ/mol
Explanation:
Based on the chemical reaction:
Glucose 1-phosphate ⇄ Glucose 6-phosphate
The equilibrium constant, Keq is defined as:
Keq = [Glucose 6-phosphate] / [Glucose 1-phosphate]
Where [] are equilibrium concentrations of each substance
Replacing:
Keq = [0.19M] / [0.01M]
Keq = 19
Now, standard free energy change, ΔG° is defined as:
ΔG° = -RT ln K
Where R is gas constant 8.314J/molK
T is absolute temperature (25°C + 273.15K = 298.15K)
and K is equilibrium constant = 19
Replacing:
ΔG° = -8.314J/molK*298.15K ln 19
ΔG° = -7299J/mol
ΔG° = -7.3kJ/mol
hello, if you can please help!
Answers
For two true is if very pressurized
Three it is an certain type of rock so probibly the third
Answer:
A: False
Explanation:
B: True
C: part of earths mantle.
Given the following unbalanced equation:
Mg +
02-
Mgo
If you want to make 47 moles of Mgo, how many moles of Mg do you need?
Answers
True or false: An atom’s valence electrons are those electrons that have the highest energy.
Answers
Answer:
False
Explanation:
Valence electrons depend of their what group they're in.
Answer: false
Explanation:
Because I looked it up
how many ml of potassium dichromate would you need to prepare 30.0ml of a 15% potassium dichromate (v/v) solution
Answers
Answer:27
Explanation:27
Please help Me This is a State Test Assay and it's for Science Lots of points please please help me
1. How is science used in the real world?
2. Should we move to Mars and set up a society? Why or Why not?
3. We have covered many units in Science this year. Which one was your favorite? Why?
I say the first one is going to be easier please it's an assay Please help me
Answers
Answer
Colonizing Mars will be beneficial as it will provide numerous economic, technological, and societal benefits. For example, colonizing Mars could be a step towards fixing the inevitable overpopulation problem.
Explanation:
URGENT!
(a) A gas' pressure is 765 torr at 296k. At what temperature will the pressure be 560. torr?
(b) Which gas law is being represented above?
Boyle's Law, Charle's Law, Gay-Lussac's Law?
Answer !BOTH! questions.
Answers
Answer:
GAY-LUSSAC'S LAW.
Explanation:
P1 = 765 torr
T1 = 23°C = 296K
P2 = 560. torr
T2 = ?
(765 torr)/(296K) = (560. torr)/ T2
T2 = 226 K = -57°C
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore the new temperature is -57°C. the law that is used over here is Gay-Lussac's Law.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Ideal gas is only for ideal gas.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
P1 = 765 torr
T1 = 23°C = 296K
P2 = 560. torr
T2 = ?
Applying Gay-Lussac's Law
(765 torr)/(296K) = (560. torr)/ T2
T2 = 226 K = -57°C
Therefore the new temperature is -57°C. the law that is used over here is Gay-Lussac's Law.
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Dwarf planets are smaller than planets. What is another way that dwarf planets are different?
A. They are not spherical.
B. They do not orbit the sun.
C. They have large objects in their orbit.
D. They move more slowly along their orbits.
Answers
Answer:
number C
Explanation:
if you have 12g of compound A2B3 (159.7g/mol), how many moles do you have?
Answers
Answer:
0.075 moles n=m/M so divide the mass (m) by the molar mass (M) to get the n which is the number of moles
Explanation:
Convert 714 years to min using Dimensional Analysis
Answers
Answer:
We know (by definition) that: 1 yr ≈ 525948.77 min.
We can set up a proportion to solve for the number of minutes.
1 yr / 714 yr ≈ 525948.77 min / x min
Now, we cross multiply to solve for our unknown x:
x min ≈ (714 yr / 1 yr) * 525948.77 min → x min ≈ 375527421.78000003 min
Conclusion:
714 yr ≈ 375527421.78000003 min
Explanation:
Hope it is helpful....
[tex]714 \: y \times \frac{12 \: months}{1 \: years} \times \frac{30.417 \: days}{1 \: month}[/tex]
[tex] = 260612.856 \: days[/tex]
[tex]260612.856 \: days \times \frac{24 \: h}{1 \: day} \times \frac{60 \: min}{1 \: h}[/tex]
[tex] = 375282512.6 \: minutes[/tex]
Which statement about covalent compounds is FALSE?
Covalent compounds can contain as little as
a 2 atoms or as many as several thousand
atoms.
b
Covalent compounds can contain a maximum
of 4 different atoms.
C
Covalent compounds are held together by
covalent bonds.
d Covalent compounds contain only nonmetals.
Answers
Answer: b . Covalent compounds can contain a maximum of 4 different atoms.
Explanation:
The covalent compounds are those compounds that are formed between the non-metals via sharing of electrons. The bonds so formed between these non-metallic atoms are covalent. There can be two or several different kinds of atoms that can form covalent bonds with each other in a single molecule. They use the valence electrons for sharing. The maximum number of valence electrons can be seven.
Answer:
b.Covalent compounds can contain a maximum of 4 different atoms.
Explanation:
Covalent compounds can contain as little as the Covalent compounds can contain a maximum of 4 different atoms.
Covalent bonds are bonds formed between non-metals by the sharing of electrons. The bonds formed between these non-metal atoms in this way are covalent bonds. There can be two or more different types of atoms within a single molecule that can form covalent bonds with each other.Therefore , the correct answer is B.
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