What type of nuclear decay is shown by the reaction below?
2390 → He + 23% Th
O A. Fusion
B. Alpha
C. Beta
D. Gamma
Answer:
B. Alpha
Explanation:
Alpha decays always split into an element and He.
Beta decays always split into an element and e- (eletrons).
Gamma decays always split into an element and radiation.
In which two places is aggregate generally found? A.floodplains and alluvial fans B.alluvial fans and mines C.mines and beneath the topsoil D.beneath the topsoil and above the topsoil ED2020
Answer:
A.floodplains and alluvial fans .
Explanation:
Hope it helps.
Answer:A)
Explanation:
Which statement describes an effect of large asteroid and comet impacts?
Answer:
They could cause an organism and population and species to die.
Explanation:
If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides
What does percent composition tell you about a molecule?
O A. It tells you the ratio of elements in the molecular formula.
O B. It tells you how the elements are arranged in the molecule.
O C. It gives you the total number of atoms in the molecule.
D. It tells you how much of a molecule is made up of each element.
Select the arrangement that indicate the ions in terms of increasing ionic radii
Cl-< F
Na+ < Cl- < F
F < Cl- < Na+
Na+ < F < Cl-
Answer:
The last option, option D is correct.
The order of increasing ionic radii of the three ions given is
Na⁺ < F⁻ < Cl⁻
Check Explanation for reasons why.
Explanation:
For elements in the same group of the periodic table, the ionic radii increases as we move down the group. This is because the number of shells increase as we move further down a group in the periodic table and that automatically confers a bigger radii to the element with the more shells.
So, between F⁻ and Cl⁻, we know the fluoride ion has electronic configuration 2, 8 (2 shells) after it gains an electron to its normal electronic configuration to form the ion, but the chloride ion has electronic configuration 2, 8, 8 (3 shells) when it achieves its own stable octet of outermost electrons.
So, it is clear how Cl⁻ ion has a bigger ionic radii than F⁻ and even Na⁺.
Then, to know which ion is bigger between Na⁺ and F⁻, it is known that when cations and anions have the same electronic configuration, the cations usually have the lesser ionic radii.
This is because in a normal, neutral atom, the number of electrons in the atom matches the number of protons. And the force of attraction between the protons and the electrons matches each other as they both have the same charges and are equal in number.
But cations result from the neutral element losing one or more electrons to achieve that stable octet. This makes the number of protons to exceed the number of electrons, hence, the electrons available are more tightly pulled towards the centre of the atom by the protons in the nucleus of the atom. This results in a reduced ionic radii.
Unlike anions that gain electrons to achieve that stable octet and have the electrons exceeding the protons in their ions, causing the pull of the protons on the electrons to be reduced, thereby resulting in a more repelled electrons pushing the ionic radii further than normal thereby increasing it.
Hope this Helps!!!
7. Write a formula for each of the following:
(a) an alkane with 22 carbon atoms
(b) an alkene with 17 carbon atoms
(c) an alkyne with 13 carbon atoms.
Answer : The formula for each of the following is:
(a) [tex]C_{22}H_{46}[/tex]
(b) [tex]C_{17}H_{34}[/tex]
(c) [tex]C_{13}H_{24}[/tex]
Explanation :
Alkanes are hydrocarbon in which the carbon atoms are connected with single covalent bonds.The general formula of alkanes is [tex]C_n H_{2n+2}[/tex] where n is the number of the carbon atoms present in a molecule of alkane.
Alkenes are hydrocarbon in which the carbon atoms are connected with double covalent bonds.The general formula of alkenes is [tex]C_n H_{2n}[/tex] where n is the number of the carbon atoms present in a molecule of alkene.
Alkynes are hydrocarbon in which the carbon atoms are connected with triple covalent bonds.The general formula of alkynes is [tex]C_n H_{2n-2}[/tex] where n is the number of the carbon atoms present in a molecule of alkyne.
(a) An alkane with 22 carbon atoms
Putting n = 22 in the general formula of alkane, we get the formula of alkane as, [tex]C_{22}H_{2(22)+2}[/tex] or [tex]C_{22}H_{46}[/tex]
(b) An alkene with 17 carbon atoms
Putting n = 17 in the general formula of alkene, we get the formula of alkene as, [tex]C_{17}H_{2(17)}[/tex] or [tex]C_{17}H_{34}[/tex]
(c) An alkyne with 13 carbon atoms
Putting n = 13 in the general formula of alkyne, we get the formula of alkyne as, [tex]C_{13}H_{2(13)-2}[/tex] or [tex]C_{13}H_{24}[/tex]
Answer:
[tex]\huge \boxed{{C_{22} H_{46} \ \ \ \ C_{17} H_{34} \ \ \ \ C_{13} H_{24}}}[/tex]
Explanation:
[tex]alkanes \ \Rightarrow \ C_n H_{2n+2}[/tex]
[tex]C_{22} H_{2(22)+2}[/tex]
[tex]C_{22} H_{44+2}[/tex]
[tex]C_{22} H_{46}[/tex]
[tex]alkenes \ \Rightarrow \ C_n H_{2n}[/tex]
[tex]C_{17} H_{2(17)}[/tex]
[tex]C_{17} H_{34}[/tex]
[tex]alkynes \ \Rightarrow \ C_n H_{2n-2}[/tex]
[tex]C_{13} H_{2(13)-2}[/tex]
[tex]C_{13} H_{26-2}[/tex]
[tex]C_{13} H_{24}[/tex]
Balance each of the following chemical equations:
a. N2(g) + O2(g) → NO(g)
b. HgO(s) = Hg(l) + O2(8)
c. Fe(s) + O2(g) →→ Fe2O3(s)
d. Na(s) + Cl2(g) →→ NaCl(s)
e. Cu2O(s) + O2(g)
→ CuO(s)
Answer:
a. N₂(g) + O₂(g) → 2 NO(g)
b. 2 HgO(s) → 2 Hg(l) + O₂(g)
c. 4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(s)
d. 2 Na(s) + Cl2(g) → 2 NaCl(s)
e. 2 Cu₂O(s) + O₂(g) → 4 CuO(s)
Hope this helps.
Which compound is used to make asphalt? a saturated hydrocarbon that has more than 35 carbons in its chain a saturated hydrocarbon that has between 17 and 35 carbons in its chain a saturated hydrocarbon that has between 5 and 8 carbons in its chain a saturated hydrocarbon that has between 1 and 2 carbons in its chain
Answer:
answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain
Explanation:
edge in 2020 :)
The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.
What is asphalt?Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.
Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.
Hence it is a saturated hydrocarbon that has more than 35 carbons.
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How many moles of atoms are in each elemental sample?
A. 1.24 g Zn
B. 28.1 g Ar
C. 84.0 g Ta
D. 2.29x10^-2 g Li
Answer:
Moles = mass(m) / Molar mass (M)
A. 1.24g of Zn
m = 1.24g
M = 65.4 g/mol
moles of Zn = 1.24g/ 65.4g/mol
= 0.01896mol
B. 28.1 g Ar
m = 28.1g
M(Ar) = 39.9g/mol
moles of Ar = 28.1g/39.9g/mol
= 0.7043 mol
C. 84.0 g Ta
m = 84.0g
M(Ta) = 181g/mol
moles of Ta = 84.0g/181g/mol
= 0.4641 mol
D. 2.29x10^-2 g Li
m = 2.29x10^-2 g
M(Li) = 6.9g/mol
moles of Li = 2.29x10^-2 g / 6.9g/mol
= 0.0033 mol
Hope this helps
Which temperature in Celsius (°C) does this thermometer show? –8° 0° 25° 32°
Answer:
0° Celsius
Explanation:
The thermometer shows 0° Celsius which corresponds to 32° F.
Answer:
0 degrees celsius
Explanation:
just did the test
In an lonie lattice:
A atoms are bonded to four others in a
Tetrahedral shapes
atoma are packed together in a
regular euble arrangement
e. atoms are bonded with a single
bonds and one double bond
D. atoms are structured in a vast
network of atoms
Reset Selection
Answer:
atoms are bonded with a single bond one double bond
Bi-S bond is relatively more stronger than Bi-N bond. How can you explain this with HSAB concept?
Answer:
A qualitative correlation between the extent of interaction between various Lewis acids and bases has been achieved by classifying the acids or bases into two classes: hard and soft in his theory of Hard and Soft Acids and Bases – HSAB. Acid-base reactions are then treated by the general principle that hard acids prefer to combine with hard bases and soft acids prefer to combine with soft bases (and vice versa). The criterion of hardness (or softness) is ascribed to the “hardness” of the electron cloud associated with any species. A firmly held electron-cloud with low polarizability makes a species “hard”, while an easily polarizable electron cloud characterizes the species as “soft”. A third category with intermediate character appears in the borderline.
Based on this information, tell us your best guess.
The Bi-S bond has been relatively stronger than the Bi-N bonds, as Bi has been a hard acid, and it combines more strongly with a hard base that is S.
The HSAB concept has been the hard and soft acid and base concept. The concept has also been termed the Pearson acid and base concept.
According to the concept, hard acids preferred to combine with the hard bases, and soft acids prefer to be combined with the soft bases. The concept gives the idea of the stability of the compounds.
The hard acids are the low electronegative, small ionic radius elements, while soft acids are large ionic radius, high positive charge.
The hard bases are the elements with a small radius and high electronegativity, while soft bases are the elements with a large ionic radius and high polarizability.
The given elements have been:
The Bi has been a hard acid.N has been a borderline base.S has been a hard base.Since hard acid tends to bond with a hard base, Bi tends to bond more strongly with S than N. Thus, the Bi-S bond has been stronger than the Bi-N bond.
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What goes in the rest?
Answer:
E. Mass number
H. Ion
F. Isotopes
I hope you have a great day. I'm sorry that I didn't know C or I.
please help i need some help with this one plz :)
Answer:
in some animal they changes their body temperature according to the environment temperature. so are called cold blooded animals.they change their temperature for adaptation.
The porticos inside a ballon are experiencing increase in average
Answer:
The porticos inside a ballon are experiencing increase in average
Scientific evidence shows that Earth's diameter, and thus overall size, does.
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
U
C. Contracting Earth
D. Continental drift
SUBMIT
Answer:
Expanding earth and contracting earth
Explanation:
Answer:
A and C
Explanation:
A solution...
A. is a single-phase homogeneous mixture.
B. can contain more than two phases.
C. must contain water.
D. is always a liquid.
Answer:
A
Explanation:
Answer:
A
Explanation:
"It means of solving a problem or dealing with a difficult situation."
Which is the electron configuration for zinc?
1. 1s22s22p63s23p64s2308
2. 1s22s22p63s23p64513d10
3. 1s22s22p53s23p64523010
4. 1s22s22p63s23p64523010
Answer:
The electron configuration for zinc is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰. To find electron configuration, simply follow the periodic table from top to bottom, left to right (basically increasing atomic number) until you reach the element you are looking for.
The orbital radii of four planets in our solar system is shown in the following table. Orbital Radii Planet Orbital Radii (AU) W 5.2 X 0.72 Y 0.37 Z 19.1 Which planets are likely to be gas giants? W and X X and Y Y and Z W and Z
Answer:
w&x
Explanation:
The planets which are likely to be gas giants are W and X
What is gas giant planet?Gas giant planets are planets which constitutes of only two gases; hydrogen and helium.
However, of all the planetry solar system, there are only four planets which are the major gas giant planets:
UranusNeptuneJupiterSaturnIn conclusion, the planets which are likely to be gas giants are W and X
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PLEASE HELP!
Why is phosphorus diamagnetic.
Answer:
FROM the magnetic point of view, phosphorus is an extremely interesting
substance because of its allotropic modifications. The ordinary forms are
the yellow (or white) and the red varieties. X-ray investigations indicate
that probably yellow phosphorus is analogous with the cubic forms of antimony and arsenic; and red phosphorus with monoclinic antimony and
arsenic (Mellor, 1928). The conclusions of different workers on the structure of red phosphorus are not in agreement. There is also Bridgman's black
phosphorus which is probably hexagonal (Linck and lung, 1925). Natta
and Passerini (1930) have studied the crystal structure of white phosphorus.
This substance when condensed at the temperature of liquid ammonia is
cubic. Atomic positions however are yet undetermined. Another and noncubic form is obtained by condensation at liquid-air temperatures. It is
thus clear that most likely white phosphorus is cubic in structure with a
probable superposition of another lattice.
The evidence from Raman effect also points to the same conclusion.
Bhagavantam (1930) investigated the Raman effect of white phosphorus in
the solid state. The characteristic frequencies obtained by him are 607, 468
and 374. Since the phosphorus molecule is known to contain 4 atoms,
Bhagavantam (1930) has shown that the tetrahedral structure fits the results
satisfactorily since such a structure would give only three frequencies. But
for the particular law of forces adopted, the frequencies should have the
ratio 2: 2: 1 but the observed frequencies deviate considerably.
Phosphorus is a really intriguing element. because of the allotropic changes to the material.
Why phosphorus is dimagnetic?Red phosphorus is likely akin to monoclinic antimony, while yellow phosphorus is probably similar to the cubic forms of antimony and arsenic.
There is disagreement among the findings of many researchers regarding the structure of red phosphorus. Additionally, Bridgman's black It is presumably hexagonal, phosphorous (Linck and lung, 1925). Natta and Passerini (1930) have investigated the white phosphorus crystal structure.
Condensed from this material at liquid ammonia temperature is cubic. However, the locations of the atoms are still unknown. Condensation at liquid air temperatures yields a different, noncubic shape.
Therefore, Phosphorus is a really intriguing element. because of the allotropic changes to the material.
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what is the mass of one mole of Cl2
Answer:
70.906 g/mol
Explanation:
Answer:
71
Explanation:
mass = mole x molar mass (Mr)
= 1 x ( 35.5 + 35.5)
= 71
at 60C how much potassium nitrate can be dissolved in 400g of water
Answer:
About 110 g
Explanation:
The solubility graph is a very useful tool because it tells you the amount of potassium nitrate that can be dissolved per
100 mL
of water in order to have a saturated solution of potassium nitrate at a given temperature.
In order to find the solubility of the salt at 60 degree celcius
start from the 60 degree celcius
Mark on the graph and move up until you intersect the curve. At the point of intersection, move left until you intersect the y axis and read off the value that you land on.
In this case, you can estimate that the solubility of potassium nitrate in water at 60 degree celcius is equal to about
solubility ≈ 110 g / 100 mL water
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
This tells you that a saturated solution of potassium nitrate will hold about
110 g of dissolved salt, i.e. of dissociated salt, per 100 ml of water at 60 degree celcius
14.
Two jewelers were asked to measure the
mass of a gold nugget. The true mass of the
nugget is 0.856 grams (g). Each jeweler took
three measurements. The average of the
three measurements was reported as the
"official” measurement with the following
results:
Jeweler A: 0.863 g, 0.869 g, 0.859 g
Jeweler B: 0.875 g, 0.834 g, 0.858 g
Which jeweler's official measurement was
more accurate? Which jeweler's measure-
ments were more precise? In each case, what
was the error and percent error in the official
measurement?
Answer:
Jeweler B = more accurate
Jeweler A = more precise
Error:
0.008, 0
% error :
0.934% ; 0
Explanation:
Given that:
True mass of nugget = 0.856
Jeweler A: 0.863 g, 0.869 g, 0.859 g
Jeweler B: 0.875 g, 0.834 g, 0.858 g
Official measurement (A) = 0.863 + 0.869 + 0.859 = 2.591 / 3 = 0.864
Official measurement (B) = 0.875 + 0.834 + 0.858 = 2.567 / 3 = 0.8556
Accuracy = closeness of a measurement to the true value
Accuracy = true value - official measurement
Jeweler A's accuracy :
0.856 - 0.864 = - 0.008
Jeweler B's accuracy :
0.856 - 0.856 = 0.00
Therefore, Jeweler B's official measurement is more accurate as it is more close to the true value of the gold nugget.
However, Jeweler A's official measurement is more precise as each Jeweler A's measurement are closer to one another than Jeweler B's measurement which are more spread out.
Error:
Jeweler A's error :
0.864 - 0.856 = 0.008
% error =( error / true value) × 100
% error = (0.008/0.856) × 100% = 0.934%
Jeweler B's error :
0.856 - 0.856 = 0 ( since the official measurement as been rounded to match the decimal representation of the true value)
% error = 0%
4. Which change to a DNA molecule would have the least effect on an organism?
A: an addition to a base sequence at the beginning of a gene
B: a substitution in a base sequence that does not code for a protein
C: a substitution that creates a "stop" code in the middle of a gene
D: a deletion from a base sequence in the middle of a gene
Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.
So A
Explanation:
This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.
what sentence describes all atoms of one element A. They have the same number of isotopes B. They have the same properties C. They have the same number of protons D.They have the same number of neutrons
Answer:
C. They have the same number of protons.
Explanation:
Even though in isotopes, there's uneven number of neutrons, there's always same number of protons.
Hope it helps.
Drag each label to the correct location. Match the climate zones to their relative temperature levels. (coldest zonehottest zonemoderate temperature zone)
Answer:
Polar Zones - Coldest Temperature
Temperate Zones - Moderate Temperature
Tropical Zones - Hottest Temperature
Explanation:
The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.
*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.
Answer:
I answered the question on edmentum and that person was correct.
Explanation:
The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.
The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.
The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.
How many grams of carbon dioxide does a hummingbird emit daily?
Answer:
3.5 g CO2
Explanation:
A hummingbird emits up to 3.5 grams of CO2 a day.
Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)
=3.5 grams
Hope this helps!
hello:) is hydrogen chloride and hydrochloride acid the same??
Answer:
No because hydrogen chloride is gas and hydrochloric acid is (as stated in the name) an acid. The formula for hydrogen chloride is HCI(g), the little g states that the compound is a gas and the formula for hydrochloric acid is HCl(aq) and the little aq means aqueous.
Answer:
no. they are not the same
Explanation: Although, they both do have the same chemical formula HCL, they differ in their states of matter. Hydrogen chloride is a gas whereas hydrochloric acid is a solution of hydrogen chloride gas and water( creates an aquaeous solution). Hydrochloric acid is highly corrossive.
Which compound is responsible for the smell that is associated with the decomposition of dead animals? acetic acid butanoic acid cadaverine dimethylether
Answer:
cadaverine
Explanation:
Cadaverine is a chemical compound with the IUPAC name of pentane-1,5-diamine. It is a chemical compound that emits a foul odour when decomposers like bacteria act on dead animal tissues.
Cadaverine is a product of protein hydrolysis by bacteria in dead tissues, specifically when amino acid LYSINE is decarboxylated. Hence, cadaverine is the compound responsible for the terrible smell produced when a dead animal is being decomposed.
What is the mass in grams of each elemental sample?
A. 6.65 mol W
B. 0.588 mol Ba
C. 68.4 mil Xe
D. 1.57 mol S
Answer:
Mass (m) = Number of moles(n) × Molar mass (M)
A. 6.65 mol W
M (W) = 184 g/mol
n = 6.65mol
mass of W = 6.65 × 184 = 1223.6g
B. 0.588 mol Ba
M(Ba) = 137g/mol
n = 0.588 mol
mass of Ba = 0.588 × 137 = 80.556g
C. 68.4 mol Xe
M(Xe) = 131g/mol
n = 68.4 mol
mass of Xe = 68.4 × 131 = 8960.4g
D. 1.57 mol S
M(S) = 32.1 g/mol
n= 1.57 mol
mass of S = 1.57 × 32.1 = 50.397g
Hope this helps