Answer:
stable nuclei are silicon-28, zinc-64 , potassium-40
while unstable one are arsenic-82 , radium-228
Explanation:
There is rule to predict stability of a nuclei that is
Z <= 20 N/Z = 1 most stable
Z = 20-40 N/Z = 1.25 stable
Z = 40-80 N/Z = 1.80 less stable
Z >= 83, nucleus becomes unstable or radioactive
Here, N/Z = no. of neutrons/ No. of protons
1. silicon-28 , N/Z =14/14 = 1 stable
2. arsenic-82, N/Z = 49/33 = 1.48 (unstable)
3. Potassium-40 , N/Z = 21/19 = 1.10(stable)
4. zinc-64, N/Z =34/30 = 1.13 (stable)
5. radium-228 (unstable, radioactive)
Therefore, stable nuclei are silicon-28, zinc-64 , potassium-40
while unstable one are arsenic-82 , radium-228
Which statement describes the law of conservation of energy?
A. All systems will exchange matter and energy with their surroundings.
B. All systems can exchange energy, but not matter, with their surroundings.
C. Energy cannot be created nor destroyed, but it changes from one form to another.
D. Energy is destroyed in most chemical reactions when new products are formed.
Answer:
Energy cannot be created nor destroyed, but it changes from one form to another.
Explanation: got it
answer this correctly, only sincere answers please. I really need help. I will do all I can to make someone answer this. Thanks! ASAP
Explain the relationship between pH, POH, hydronium concentration and hydroxide concentration and be prepared to complete the chart below based on the provided knowns.
Complete the chart below based on the provided knowns.
H+ ______x_______
OH - 1 x 10^-11______
pH 3_____________
POH _____y_______
Answer:
See Explanation
Explanation:
Let us recall that;
[H^+] [OH^-] = 1 * 10^-14
Where;
[OH^-] = 1 x 10^-11
Then;
[H^+] = 1 * 10^-14/1 x 10^-11
[H^+] = 1 * 10^-3
pH = -log [H^+]
pH = -log(1 * 10^-3)
pH = 3
Also;
pH + pOH = 14
pOH = 14 - pH
pOH = 14 -3
pOH = 11
I don’t know how to do this, LIKE IT WAS NOT EVEN IN THE VIDEO :/
The formation of soap can be done with the process of saponification in which triglyceraldehyde reacts with 3 molecules of Sodium Hydroxide (NaOH) and produces Glycerol and 3 molecules of Sodium palmitate (Soap).
(Reaction is attached as image)
What is Saponification ?Saponification is a process that involves the conversion of fat, oil, or lipid, into soap and alcohol by the action of aqueous alkali.
Soaps are salts of fatty acids, which in turn are carboxylic acids with long carbon chains.
Hence, The formation of soap can be done with the process of saponification in which triglyceraldehyde reacts with 3 molecules of Sodium Hydroxide (NaOH) and produces Glycerol and 3 molecules of Sodium palmitate (Soap).
Learn more about Saponification here ;
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Define "mole in chemistry terms
Answer:
Can you please post a pictah.
Explanation:
Answer: A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
A chemist has a small amount of compound that has the boiling point 65°c that must be fractionally distilled. Yet, the chemist doesn't want to lose any of the compound to hold up on the column. What the chemist should do?
Answer:
A "chaser," a high-boiling compound whose vapors will displace the vapors of the desired low-boiling compound, can be used to distill a small amount of compound.
A smaller fractionation apparatus or a Vigreux column could be used instead.
Explanation:
Write the balanced half equation of iron 2 and permanganate in a solution of acid. Show all of your work.
Answer:
5Fe⁺² + MnO₄⁻ + 8H⁺ => 5Fe⁺³ + Mn⁺² + 4H₂O
Explanation:
Fe⁺² + MnO₄⁻ + H⁺ => Mn⁺² + Fe⁺³ + H₂O
5(Fe⁺² => Fe⁺³ + 1e⁻) => 5Fe⁺² => 5Fe⁺³ + 5e⁻
MnO₄⁻ + 5e⁻ => Mn⁺² => MnO₄⁻ + 8H⁺ + 5e⁻ => Mn⁺² + 4H₂O
=> 5Fe⁺² + MnO₄⁻ + 8H⁺ => 5Fe⁺³ + Mn⁺² + 4H₂O
30 points ASAP Which are limiting nutrients for plant growth?
water and nitrogen
nitrogen and carbon
carbon and phosphorus
phosphorus and nitrogen
I think its phosphorus and nitrogen
Which reaction type is the following: AgF + CaCl2 --> AgCl + CaF2
Explanation:
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[tex]\small\mathfrak\purple{Double \: displacement \: reaction} \\ \\ \small\mathfrak\orange{hope \: it \: helps...}[/tex]
The half-cell is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction.
a. True
b. False
Answer:
True
Explanation:
In a cell reaction, half cell reaction is oxidation. Oxidation means addition of electrons. This addition of electrons takes place at cathode. Therefore, cathode is site of oxidation. However, the other half cell reaction is reduction. In reduction reaction removal of electrons takes place. Reduction takes place at anode of the cell.
Therefore, the given statement is true.
A mystery compound is a liquid with a boiling point of 50°C. is it likely to be in Ionic compound .why or why not?
Answer:
No, because it is low, which is characteristic of covalent compounds.
Explanation:
Hello there!
In this case, for the analysis of this liquid whose boiling point is 50 °C, it is necessary for us to keep in mind that ionic compounds have high boiling points whereas covalent compounds tend to have lower boiling points. This is due to the fact that ionic compounds have stronger intermolecular forces, so more thermal energy is required for the reaction; and covalent compounds are more weakly held together so their boiling points tend to be relatively low.
In such a way, since 50 °C is a relatively low boiling point, in comparison to waters that is about 100°C and it is polar covalent, we infer this compound is not likely to be an ionic compound but a covalent compound.
Regards!
Plzzzzzzzzzzzzzzzz help
Answer:
Your correct.
Explanation:
Answer:
The answer is C.
Explanation:
I just know.
How many grams of NiNi are formed from 55.3 g55.3 g of Ni2O3Ni2O3?
2Ni2O3(s)⟶4Ni(s)+3O2(g)2Ni2O3(s)⟶4Ni(s)+3O2(g)
Step 1: Show the strategy for solving this problem.
You are currently in a labeling module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop.
grams Ni2O3⟶⟶⟶grams Nigrams Ni2O3⟶⟶⟶grams Ni
Answer Bank
grams O2O2
moles NiNi
grams NiNi
moles Ni2O3Ni2O3
moles O2O2
grams Ni2O3Ni2O3
Answer:
110.92 g
Explanation:
Amount of Ni2O3 consumed= 55.3/59 =0.94 moles
From the reaction equation;
2 moles of Ni2O3 yields 4 moles of Ni
0.94 moles yields 0.94 moles * 4/2
= 1.88 moles of Ni2O3
Mass of 1.88 moles of Ni2O3 = 1.88 moles of Ni2O3 * 59 gmol-1 = 110.92 g
Is cardboard a solid
Answer:
yes because it has a fixed shape and volume
hope this helps
have a good day :)
Explanation:
How many moles of gas are in a 25 L container if the temperature is 289 K and the pressure is 125 atm?
Answer:
1.3 moles
Explanation:
pv = nrt
n = pv/rt
n = (125 * 25) / (8.3144598 * 289)
n = 1.3 moles
Name the guy thats Speedrunning yt right now
Answer:
Lyric
Explanation:
My best guess
Why do different parts of the world have such different animals?
Answer:
a
Explanation:
TRUE OR FALSE?
The reason for forming multiple bonds is an interaction of end to end type between unhybridized p orbitals.
20 points!
Answer:
I think its false
Explanation:
8. What is the volume of 5.6 moles of carbon dioxide gas at STP?
Answer:
125.5 ×10^-3 m^3= 0.1255 m^3
Explanation:
Volume=5.6mol×22.414dm^3
=125.5dm^3
What common compounds are in selenium? Where are these compounds found and what are they used for? What properties do they have?
Please answer AS SOON AS POSSIBLE!!! Thanks!!!!!
Answer:
tanaka..........................
7. Assume that you have collected 867 L of nitrogen gas at STP. What is the mass of the nitrogen gas?
Answer:
1083.6 g
Explanation:
At STP, 1 mol of any given mass will occupy 22.4 L.
With the information above in mind we can calculate how many moles of nitrogen gas (N₂) are there in 867 L:
867 L ÷ 22.4 L/mol = 38.7 molFinally we convert 38.7 moles of N₂ into grams, using its molar mass:
38.7 mol * 28 g/mol = 1083.6 g12. Convert 1.98 grams of PbSo, to molecules.
No links please
Answer:
3.93 × 10²¹ molecules
Explanation:
Convert 1.98 grams of PbSO₄ to molecules.
Step 1: Given data
Mass of PbSO₄: 1.98 g
Step 2: Calculate the number of moles corresponding to 1.98 g of PbSO₄
The molar mass of PbSO₄ is 303.26 g/mol.
1.98 g × 1 mol/303.26 g = 6.53 × 10⁻³ mol
Step 3: Calculate the number of molecules in 6.53 × 10⁻³ moles of PbSO₄
To convert moles to molecules, we need a conversion factor: Avogadro's number. There are 6.02 × 10²³ molecules of PbSO₄ in 1 mole of molecules of PbSO₄.
6.53 × 10⁻³ mol × 6.02 × 10²³ molecules/1 mol = 3.93 × 10²¹ molecules
Yo wassup with these links every time I ask a question there’s a link everywhere it’s making me mad this needs to stop
what is the difference between diffusion and osmoses
Answer:
Diffusion means that particles travel from a higher concentration to a lower concentration region before balance is achieved. The semi-permeable membrane is present in osmosis, so that only solvent molecules can travel freely to equalize the levels.
elect the best choice, and briefly indicate the reason for your choice: a. Lowest ionization energy: K Rb Cs b. Most favorable electron affinity: Cl Br I c. Most energy required to remove an electron: Cu Cu Cu2
Answer:
Lowest ionization energy: Cs
Most favorable electron affinity: Cl
Most energy required to remove an electron: Cu2+
Explanation:
Ionization energy decreases down the group. That means that as we move down the group, the ionization energy of elements decreases due to greater distance of the outermost electron from the nucleus and greater screening effect of inner electrons on this outermost electron. Hence Cs has the lowest ionization energy.
Electron affinity of halogens decreases down the group. Hence, Cl possess the most favorable electron affinity.
When an electron has been removed from an atom, the removal of the next electron is usually harder. Thus, the second ionization energy is always greater than the first ionization energy and so on. Thus, it is most difficult to remove an electron from Cu^2+ from which two electrons have already been removed.
What is the definition of specific heat?
A. The heat needed to raise the temperature of 1 g of a substance
1°C
B. The total amount of energy contained within 1 mole of a
substance
C. The heat required to break the molecular bonds within a
substance
D. The temperature change between the melting and boiling points of
a substance
Answer:
A. The heat needed to raise the temperature of 1 g of a substance 1°C.
Explanation:
how this has helped you
Please hurry!!! And help!!
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Best answer gets marked Brainliest!
The table below shows several minerals found in earths crust based on the information in the table which mineral is also an element
A) Calcite
B) quartz
C) hematite
D) graphite
Answer:
Graphite, because it has atoms of same atomic and electrovalent electrons
Given the following information: SO2(g) + 12 O2(g) = SO3(g) Kp = 2.5E-2 What is the Kp value for the following reaction: 2 SO2(g) + O2(g) = 2 SO3(g)
Answer:
K = 6.25x10⁻⁴
Explanation:
Based on the reaction:
SO₂ + 1/2 O₂ ⇄ SO₃ Kp = 2.5x10⁻²
We can find the Kp of a similar reaction using Hess's law where the sum of 2 reactions a and b produce a K that is:
K = Ka*Kb
The sum of twice the reaction of the problem:
SO₂ + 1/2 O₂ ⇄ SO₃
+ SO₂ + 1/2 O₂ ⇄ SO₃
2SO₂ + O₂ ⇄ 2SO₃
Where K must be:
K = Kp*Kp = Kp²
K = (2.5x10⁻²)²
K = 6.25x10⁻⁴In the covalent compound CH3, the Greek prefix used to represent the anion is Answer here
Answer:
Tri.
Explanation:
''Tri'' is the Greek prefix used to represent the CH3 because there are three hydrogen atoms to form the covalent compound so in Greek method ''Tri'' is used for three. In Greek system, there are certain names for prefixes such as ''di'' is used for two, ''tri'' is used for three, ''tetra'' is used for four etc. This method only provides information about the number of atoms that form the covalent compound.
convert 32 degrees celsius to kelvin
Answer:
305.15
Explanation:
32 celsius converted to kelvin is 305.15 kelvin
Formula
32°C + 273.15 = 305.15K
What happens when a solid turns straight into gas and skips the liquid stage?
Answer:
Explanation:
Liquid to solid phase transitions are known as "freezing.". Solid to liquid phase transitions are known as "melting.". Solid to gas phase transitions are known as "sublimation.". In most cases, solids turn into gases only after an intermediate liquid state.