Answer:
See Explanation
Explanation:
Alpha Decay is the emission of helium nuclei (₂He⁴). That is, two protons and two neutrons are emitted. By formula equation ...
₈₂Pb²⁰⁸ => ₈₀Hg²⁰⁴ + ₂He⁴ => ₈₀Hg²⁰⁴ + (₂α⁴)⁺²
Note the sum of superscripts & subscripts of reactants (₈₂Pb²⁰⁸) must equal sum of superscripts & subscripts of products (₈₀Hg²⁰⁴ + ₂He⁴); that is ...
∑mass reactants = ∑mass products => 208 = 204 + 4
∑atomic no. reactants = ∑atomic no. products => 82 (Pb) = 80 (Hg) + 2 (α⁺²)
Hope this helps. Doc :-)
Suppose you discovered a Group 2 element that has an atomic number larger than radium (Ra). What do you expect the melting and boiling points to be? Explain.
Answer: The melting point would be lower and the boiling point would be higher
Explanation: From Beryllium to Barium the melting point and the boiling point were constantly decreasing. after that, Radium's boiling point starts to increase in temperature. So I would assume that if there was an element in group 2 with a higher atomic number than Radium it's melting point would continue decreasing while the boiling point increased.
When, we discovered a Group 2 element having an atomic number larger than radium (Ra). Then, we expect that the melting and boiling points of Group 2 elements generally decrease as you move down the group. This is because the outermost electrons are farther from the nucleus due to the increased number of electron shells.
Group 2 elements are alkaline earth metals, and they exhibit certain trends in their physical properties as you move down the group in the periodic table. Radium (Ra) is the last naturally occurring element in Group 2. If we discover a hypothetical Group 2 element with an atomic number larger than radium, it would likely be an artificially synthesized element, and its properties would be subject to speculation.
As we move down Group 2, the atomic number increases, and the elements have more electron shells. This leads to several trends:
Melting and Boiling Points:
The melting and boiling points of Group 2 elements generally decrease as you move down the group. This is because the outermost electrons are farther from the nucleus due to the increased number of electron shells. As a result, the metallic bonds that hold the atoms together weaken, making it easier to break the lattice structure and transition from solid to liquid or gas.
If the hypothetical Group 2 element has an atomic number larger than radium, it would likely have more electron shells and thus a lower melting and boiling point compared to radium. This trend follows the pattern observed in other Group 2 elements.
Density:
Group 2 elements also tend to become less dense as you move down the group. This is because the increase in electron shells leads to larger atomic sizes, and the increased atomic volume decreases the packing efficiency in the solid state.
A Group 2 element with an atomic number larger than radium would likely have a lower density than radium, following the trend observed in the rest of the group.
Reactivity:
Group 2 elements become more reactive as you move down the group. This is because the outermost electrons are farther from the nucleus and are more easily lost, leading to more vigorous chemical reactions, especially with water and oxygen.
The hypothetical Group 2 element might exhibit increased reactivity compared to radium and other elements in the group.
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A chemist who frequently carries out a complex experiment is
likely to have high:
a. Precision, but low accuracy
b. Precision
c.Accuracy, but low precision
d.Accuracy
Answer:
c.
Explanation:
This is because the chemist will get the average of the experiment from multiple attempts but not precision because the experiment is complex rather than simple.
The chemist will most likely have high accuracy, but low precision. A
chemist who has been performing experiments frequently will be accurate
when taking the required measurements for the experiment due to the
frequency.
Precision however won't be affected because precision deals with how
close his results from the experiment are. The complexity of the
experiment and the different variables used makes him likely to have low
precision.
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students are comparing the parts of a cell to the parts of a city. Which of the following would provide the best comparison to the nucleus of a cell?
Answer:
City Hall - directs necessary activities throughout the city
Explanation:
Answer:
Town Hall,
Explanation:
A person has a mass of 80.0 kg on
Earth, what would their mass be on
Mercury, which has 1/3 the gravity of
Earth?
A. more than on the Earth
B. less than on the Earth
C. the same as on earth
Answer:
The same as on earth
Explanation:
mass is the amount of matter in an object and the mass of an object is always the same at any point in time
gravity will only have effect on the weight and not the mass.
so assuming the question was talking about the weight, then we can say the weight will be lesser on Mercury
Based on their definitions, electron affinity could be considered the opposite of
Based on their definitions, electron affinity could be considered the opposite of electron affinity. This is the force required to remove an electron from an atom while it is gaseous, or the propensity of an atom to lose electrons.
What is meant by electron?The electron is a subatomic particle with a negative one elementary charge electric charge. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, are typically regarded to be elementary particles.
An electron is a negatively charged subatomic particle that can exist either free or bound to an atom (not bound). Along with protons and neutrons, electrons are one of the three primary types of particles that make up an atom. Together, protons, neutrons, and electrons make up the atom's nucleus.
This is the force required to remove an electron from an atom while it is gaseous, or the propensity of an atom to lose electrons. Conceptually, this is the polar opposite of electron affinity.
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The answer would be ionization energy
Which two options are examples of chemical changes?
Answer:
gas and liquid ;-;
Explanation:
correct me if im wrong
THIS IS DUE LIKE REALLY SOON I RLLY NEED HELP :,)
The primary way in which the amount of carbon dioxide in the atmosphere can be increased is by ____.
the burning of fossil fuels
Kinda confused on this. i need some help.
Which of the following actions will not increase the rate at which a solid dissolves in
a liquid?
using smaller particles of the solid
O lowering the temperature of the system
O increasing the surface area of the solid
stirring the solid and the liquid
Answer:
O lowering the temperature of the system
What does it mean for a unit to be "derived"?
Answer:
you differentiate to find the derivative
Explanation:
Answer:
A derived unit is a unit that results from a mathematical combination of SI base units.
OR
A unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors.
Explanation:
i dont know if that answered your question
(Boost your knowledge questions)
1. Can you light Diamond on fire?
2. What is the difference between a Chemical Process and a Physical Process?
3. How many electrons fit in each shell around an atom?
Answer:
a) Diamond can indeed be set on fire since it is made of carbon. ... Although diamond requires a higher temperature to burn, it does indeed burn via normal carbon combustion. You can even burn diamond in a regular flame if you are patient and conditions are right.
b) In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. The distinction between physical and chemical change is not clear cut.
c) Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.
MARK ME AS A BRAINLIST PLZ
A Rectangular Prism has a height of 4cm, a width of 5cm, a length of 1.2 cm, and a mass of 85,000 g. What is it's density?
A. .00000035416 g/cm3
B. 00035416 g/cm^3
C. 354.16 g/cm^3
D. 3541.6 g/cm
Answer:
The answer is D.
Explanation:
Volume (V) = l x w x h
V = 4 x 5 x 1.2
V = 20 x 1.2
V = 24
Density = Mass/Volume or D = M/V
D = 85,000/24
D = 3541.66666666
What’s boiling/melting point
Answer:
Melting point is the temperature at which solid and liquid phases of a substance are in equilibrium.
Boiling point is the temperature at which its vapour pressure is equal to the external pressure.
Answer:
melting point is the temperature at which a solid changes into a liquid.
boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure
Explanation:
Plants combine water (liquid) and carbon dioxide (gas) to make sugar (solid) during photosynthesis. This is an example of__.
Answer:
Explanation:
It' an example of photosynthesis and plants make oxygen and suger (glucose). Hope this helped
1. Write down two ways in which a mountain can be worn away.
Answer:
Gale force winds, lightning strikes, temperature extremes and a deluge of snow, hail or rain. These combined forces break up the rocks and erode the peaks into their stark, sculpted forms.
Explanation:
Which of the tests would involve a chemical change in the mineral?
hmmm water
Explanation:
Water can change if you put food coloring
in it
How are valence electrons and ionization energy related?
What compound is this?
Answer:
Carbon Tetrachloride
Explanation:
1 Carbon atom, 4 chlorine atoms (hence "tetra" prefix)
How many electrons does an alpha particle contain
Pls help me, I’ll give 30 points
What is the pH of a solution if [H+] = 1.0 x 10-5M? *
1 point
5.00
7.00
11.00
50.0
Answer:
5.00
Explanation:
because ignoring the pH solution part and doing the math it comes around to 1.0x5.0 which 1 times anything is itself so its 5
the maximum internal receiving temperature for fresh poultry is:
It should be noted that the maximum internal receiving temperature for fresh poultry is 41°F.
Temperature simply refers to the measure of hotness or coldness which is expressed in several scales. It's the manifestation of thermal energy in a matter.
It should be noted that the key to limiting the bacterial growth of food is to control the temperature. The maximum acceptable receiving temperature for fresh poultry is 5°C (41°F).
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a 50.0 ml beaker contains 680. g mercury what is the density of mercury
Answer:
5.43 grams
Explanation:
because, Its one of the smallest planets, and is also very close to the Sun.
3. Which part of a cell is not found in the cytoplasm?
a. chromosomes
b. Golgi body
c. ribosome
d. vacuole
Answer:
vacuole
Explanation:
Brainliest please
I need help with this
Why is it important to possess fundamental research skills in pursuing your study?
Answer:
Research Skills enable people to identify a problem, collect informational resources that can help address the problem, evaluate these resources for quality and relevance and come up with an effective solution to the problem.
Explanation:
It is important because it might increase you critical thinking skills and it's much more easy for you to collect data. It also helps you analyze information from different sources off the internet.
i need help TnT
do you think someday human beings will become extinct also because of diseases and pandemics?
What program or projects you would like to propose to avoid the extinction of human beings to happen?
Write your advocacy program or projects on the space provided below. (You may state your answers with a minimum of 5 sentences in a paragraph or bulleted paragraph form). *
Explanation:
I don't think human beings will ever extinct
cause they are smart and adaptive
Q1. I don't know the future but I would say that Humans will not become extinct because of diseases and pandemics.
A 12.0 L helium balloon is inflated in an air-conditioned store at 21.0C. Assuming that the pressure remains constant, how large is the balloon when it is taken outside on a hot day at 40.0C?
The ballon will be 22.86L large when it is taken outside on a hot day at 40⁰C
According to pressure law, the volume of a given mass of gas is directly proportional to the temperature. This is expressed as:
V = kT
k = V1/T1 = V2/T2
Given the following parameters
V1 = 12.0L
T1 = 21⁰C
T2 = 40.0⁰C
Required
Final volume
Substitute the given parameters into the formula
12/21 = V₂/40
21V₂ = 12 * 40
21V₂ = 480
V₂ = 480/21
V₂ = 22.86L
Hence the ballon will be 22.86L large when it is taken outside on a hot day at 40⁰C.
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I need helppppppppppp
A B C
a. Mg(12) 2.8.2 -2e- = Mg2+
b. S(16) 2.8.6 +2e- = S2-
c. MgS
d. No, because it is neutral
