Answer:
255 amu has relative abundance 67.5% and 257 has relative abundance 32.5%
Explanation:
Average atomic mass =sum of product of atomic mass and relative abundance all divided by hundred or total abundance
A(n) ____________________ has a rectangular shape and contains a cell wall, chloroplasts, and one large vacuole.
238
U
92
+
Th
90
4
He
2
When radioactive uranium, or U-238, decays it emits an alpha particle and produces a nuclide of thorium. According to the nuclear
equation, what is the mass of the thorium produced?
A)
234
B)
238
C)
242
D)
244
Answer:
c) 242
Explanation:
you subtract 238-92= 146 then you add 146+90+4+2 that will give you 242
word equations- Please help ASAP
Answer:
See answer below
Explanation:
In this case, you just need to use any acid you want (Like HCl, or H₂SO₄) to do this exercise.
You are given a sample of what you have to do which is:
Acid + metal ------> Salt + hydrogen
As you can see, an acid like the ones I wrote above, have hydrogen atoms, so you should put the hydrogen there. As for the part of salt, you just need to draw the corresponding salt that is formed when the acid reacts with the metal, and write it's name.
Let's do all three equations for you to a better understanding. For all the given examples, I will use HCl as acid, and i will explain one reaction cause the other two reactions happens the same thing, only with a different metal.
1. 2HCl + Zn ------> ZnCl₂ + H₂
As you can see, we just have a displacement reaction where the metal displaces the position of the hydrogen to form the salt and the hydrogen leaves the molecule as a gaseous molecule. Written in words it would be:
Hydrochloric acid + Zinc ----> Zinc chloride + hydrogen
2. 2HCl + Pb -------> PbCl₂ + H₂
Hydrochloric acid + lead ------> Lead (II) chloride + hydrogen
3. 2HCl + Fe -------> FeCl₂ + H₂
Hydrochloric acid + iron ------> Iron (II) chloride + hydrogen
Hope this helps
Calculate the pH of a 0.002M acetic acid solution if it is 2.3% ionised at this dilution, ka=1.8×10^-5.
Answer:
3.11 is the pH of the solution
Explanation:
The ionised form of the acetic acid is the acetate ion. To solve this problem we need to solve H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer
pKa = -log Ka = 4.74
[A⁻] = Concentration of acetate ion = 0.002M * 2.3% = 4.6x10⁻⁵M
[HA] = Concentration of acetic acid = 0.002M *(100-2.3)% = 0.001954M
Replacing:
pH = 4.74 + log [4.6x10⁻⁵M] / [0.001954M]
pH = 3.11 is the pH of the solution
Think about and describe how the organism might move around and how it might eat.Required to answer.
Answer:
Organisms move and eat through their habitats. They adapt to the environment and can survive in the environment with their own behavior.
Explanation:
Organisms are of many types. Some lives on land, some lives in water while others are hybrid organisms which can survive in water as well as on land. The organisms body movement is dependent on its cell functioning. Every organism has different cell structures which help them to survive on the earth.
What is an isotope and how are they formed?
Answer:
Long story short, isotopes are simply atoms with more neutrons — they were either formed that way, enriched with neutrons sometime during their life, or are originated from nuclear processes that alter atomic nuclei. So, they form like all other atoms.
Explanation:
Usually , it takes very little time for a community to develop during primary succession False True
HELPS
Is PCI3 a good conductor?
Answer:
Since the ions cannot move, ionic solids are non-conductors of electricity. When the solid is melted to a liquid, however, the ions are free to migrate. Therefore, ionic liquids are good conductors of electric current. A conductor is a substance capable of transmitting electricity and/or heat.
Explanation:
:)
No, [tex]PCI_3[/tex] is not a good conductor.
What is [tex]PCI_3[/tex]?Phosphorus trichloride is an inorganic compound with the chemical formula PCl3. A colourless liquid when pure, is an important industrial chemical, being used for the manufacture of phosphates and other organophosphorus compounds.
The liquid does not conduct electricity because of the lack of ions or mobile electrons.
Hence, no, [tex]PCI_3[/tex] is not a good conductor.
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The following dot plot represents the litter sizes of a random sample of labrador retrievers.
Calculate the mean, median, and mode for this set of data.
Calculate the range, interquartile range, and mean absolute deviation (rounded to the nearest hundredth) for this set of data. For the mean absolute deviation, do not round the mean.
Make two inferences about the litter size of labrador retrievers.
Answer:
12
Explanation:so the mean deviation is for the square and the square is for you so you keep the square and add it.
Answer:
1. mean: 7.78 median: 8 mode: 7
2. range: 9 interquartile range: 2 MAD: 4.5367
3. The range is about 4 times bigger than the interquartile range. The mean is around double the MAD.
Explanation:
what are some compare and contrasts between Terrestrial Planets and Gas Planets?
The first law of thermodynamics is observed when
Answer:
Explanation:
The first law of Thermodynamics is known as Conservation because it explains that energy is always maintained within a closed system and cannot be created or destroyed. Therefore, this is observed when there is no longer change in temperature in a system. Mainly because the energy is not being transferred to and from another system. Without this transfer of energy, the energy itself gets conserved within the system and the temperature no longer fluctuates.
Can someone help me with this please?
How many electrons does potassium, shown above, need to gain or lose to become stable?
Group of answer choices
gain 2
gain 1
lose 1
lose 2
Answer:
It would tend to lose two electrons and form a +2 ion. Potassium is in the first column and therefore has 1 electron in its outermost shell. It would tend to lose one electron and form a +1 ion.
What’s the answer for this question
Answer:
i think it's B
Explanation:
what is a climax community? no plagiarism.
Answer:
In scientific ecology, climax community or climatic climax community is a historic term for a boreal forest community of plants, animals, and fungi which, through the process of ecological succession in the development of vegetation in an area over time, have reached a steady state.
Explanation:
Compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07% Write the molecular formula of X .
Answer: N2F4
Explanation:(NF2)x2 = N2F2
The compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07%, then the molecular formula of X is N2F4.
What is molecular formula?Molecular formula is defined as a chemical formula that give the total number of atoms of each elements in each molecule of a substance.
It can also be defined as a phrase that specifies the number of atoms of each element in a complex molecule.
It represents the actual number of each atom in a molecules.
It tells us which atoms and how many of each types of atoms are present in a molecule.
NF2 x 2 = N2F4
Thus, the compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07%, then the molecular formula of X is N2F4.
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NaCl is purified by adding HCl to a saturated solution of NaCl (317 g/L). Will pure NaCl precipitate when 10mL of 13.0 M HCl is added to 0.2 L of saturated solution?
Answer:
Yes, pure NaCl will precipitate out of the solution
Explanation:
The parameters of the NaCl solution and HCl mixture are;
The saturation of the NaCl solution = Saturated solution
The mass concentration of the NaCl solution = 317 g/L
The volume of the HCl added = 10 mL
The concentration of the HCl added = 13.0 M HCl
The volume of the saturated NaCl solution = 0.2 L
The molar mass of NaCl = 58.44 g/mol
The number of moles of NaCl per liter = (317 g/L)/(58.44 g/mol) = 7925/1461 moles ≈ 5.42 moles
The ionization of the molecules in solution are;
HCl (aq) + H₂O (l) → H₃O⁺ (aq) + Cl⁻ (aq)
NaCl (s) ↔ Na⁺ (aq) + Cl⁻ (aq)
The number of moles of the Cl⁻ ion from the HCl is 13 moles per liter, the number of moles of Cl⁻ ion from the saturated solution of NaCl is approximately 5.42 moles, therefore, ionic product I.P. of the solution of Cl⁻ ions is larger than the solubility product of the solution, [tex]K_{sp}[/tex] of the NaCl and according to Le C h a t e l i e r's principle, NaCl will precipitate out of the solution
What type of reaction is the one shown above?
Answer:
.D you have any idea
Explanation:
Sana makatulong
The modern continent of Africa is currently in the process of splitting into
multiple tectonic plates. The Nubian Plate is moving eastward. The Somali Plate is
also moving eastward, but at a slightly faster rate. In what way is this event like
the breakup of Pangaea?
Tectonic plates are found in the oceanic and continental lithosphere. The splitting of Africa and the plate tectonics movement is similar to Pangaea as the latter was a large continent that also split.
What is Pangaea?
Pangaea was a large continent in the early geological times that covered almost all the landmass of the earth. It was a supercontinent that underwent splitting after the continental plates started drifting apart, resulting in the formation of the now known continents.
The movement of the Nubian and the Somali plates of Africa is similar to that of the Pangaea as the continent is big and intact now but in the future, the plates will drift very apart, creating more smaller continents.
Therefore, the Pangaea event is similar to the plate tectonic movement of Africa.
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9 Answer
Based on Table S, an atom of which element has the strongest attraction for electrons in a chemical bond
What is the answer?
1 aluminum
2 chlorine
3 magnesium
4 sulfur
Answer:
Chlorine
Explanation:
The tendency of an atom to attract electron is referred to as electronegativty. In the periodic table, electronegativity increases across the period from left to right and decreases down the group.
Following that trend, the element with the greatest electronegativty is;
Chlorine
The atom that has the strongest attraction for electrons in a chemical bond in the options is Chlorine.
The tendency of an atom to attract electrons to itself is know as electronegativity.
The most electronegative element is fluorine.
Electronegativity increases across the period in the periodic table.
Electronegativity decreases down the group in the periodic table.
Examples of electronegative elements are mostly non metals like oxygen, fluorine, chlorine, etc.
Therefore, the atom that has the strongest attraction for electrons in a chemical bond is Chlorine.
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the bus will stop here into question tag
Answer:
the bus will stop here, wouldn't it?
examine the diagram of the cell which or general is marked with an X help
Answer:
I'm pretty sure it's the cell membrane
When a gas is heated, the gas particles have more kinetic energy. Complete the following sentence: This means they move about more and have more ______ with the sides of the container. This increases the pressure.
Answer:
Contact
Explanation:
As the speed of the particles increases, they move around more, which means they hit the sides of the container more.
The net force of an object describes…
- The force that balances out the force of gravity
- All the forces in the same direction
Answer:
The vector sum of all forces that act upon an object
pls help i have to pick 3 T-T
Answer:
Explanation:
elemant
compound
mixture
Which is evidence of climate-forced sea level rise submerging of low islands and coastlines decreased temperature of oceans temperature changes for surface currents increased carbon dioxide in the atmosphere
Answer: Ocean rise?
Explanation:
Answer:
submerging of low islands and coast lines
Explanation:
earth science climate change unit test
Molar Concentration of H2O+ lons
in Four Solutions
Solution Molar Concentration
of H3O+ lon
(M)
A 0.1
B 0.01
с 0.001
D I’m 0.0001
Which solution has the highest pH?
Answer:
d
Explanation:
because it’s moving the most spots to the left
The acidity or alkalinity of a solution depends upon its hydronium ion concentration and hydroxide ion concentration. Here among the given solutions, the solution D has the highest pH. The correct option is D.
What is pH?The pH of a solution is defined as the negative logarithm to the base 10 of the value of the hydronium ion concentration in moles per litre. The pH scale is introduced by the scientist Sorensen. It is more easy to express the concentration of H₃O⁺ using this method.
The equation used to calculate the pH of the solution is given as:
pH = -log[H₃O⁺]
For 0.1 M
pH = -log[0.1] = 1
For 0.01 M
pH = -log[0.01] = 2
For 0.001 M
pH = -log[0.001] = 3
For 0.0001 M
pH = -log[0.0001] = 4
So solution D has the highest pH which is 4.
Thus the correct option is D.
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Zinc chloride + Magnesium →
Answer:
im assuming you need the balanced equation
Explanation:
Zn + MgCl2 = ZnCl2 + Mg
Answer:
it will mgcl2 + zn
Explanation:
Mg will replace zn from its salt solution
to form mgcl2
hope it helps
Which describes the path of energy that a gas powered car uses to drive along a road?
A. nuclear energy to light energy to electrical energy
B. chemical energy to heat energy to mechanical energy
C. mechanical energy to electrical energy to light energy
D. gravitational energy to kinetic energy to electrical energy
Answer:
mechanical energy to electrical energy to light energy
100 POINTS +BRAINLIEST PLZ ANSWER ASAP
Eduardo looks at stars through his telescope. He says that the star Sirius is brighter than the star Rigel. In reality, Rigel has a greater absolute brightness than Sirius. What can explain Eduardo's observation?
A. Sirius is much closer to Earth than Rigel
B. Rigel is much closer to Earth than Sirius
C. Sirius is a hotter star than Rigel.
D. Rigel is a hotter star than Sirius,p
Answer:
answer is A. Sirus is much closer to Earth than Rigel.
Answer:
A
Explanation:
