Answer: The answers are the first and third options.
Answer:
1.0'c
3.32'f
Explanation:
What for a neutral element is [Kr] 4d8 5s2 ?
Answer:
1.Hydrogen: 1s1 2 - Helium: 1s2
45 – Rhodium: [Kr], 5s2, 4d7 46 – Palladium: [Kr], 5s2, 4d8
47 – Silver: [Kr], 5s2, 4d9 48 – Cadmium: [Kr], 5s2, 4d10
49 – Indium: [Kr], 5s2, 4d10, 5p1 50 – Tin: [Kr], 5s2, 4d10, 5p2
Thus 43 electrons, so the neutral atom has atomic number 43. Look at a periodic table and you see that this element is technetium.
Element Atomic Number Element Symbol Element Electron Configuration
45 Rh [Kr] 4d8 5s1
46 Pd [Kr] 4d10
47 Ag [Kr] 4d10 5s1
48 Cd [Kr] 4d10 5s2
A chemist wants to extract the gold from 54.9 g of AuCl3*2H20 *gold(III) chloride dyhydrate) by electrolysis of an aqueous solution. What mass of gold could be obtained from this sample? Answer in units of g
From the information provided in the question, the mass of gold that can be obtained from this sample is 31.5 g of Au.
Given that the reduction of gold III occurs thus;
Au^3+(aq) + 3e ------> Au(s)
Number of moles of gold(III) chloride dihydrate = mass/molar mass = 54.9 g /339.35 g/mol = 0.16 moles
Number of moles of Au^3+ in AuCl3.2H20 = 0.16 moles
Now;
1 mole of Au has a mass of 197 g/mol
0.16 moles of Au has a mass of 0.16 moles × 197 g/mol/1 mole
= 31.5 g of Au.
The mass of gold that can be obtained from this sample is 31.5 g of Au.
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The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg O2 Right arrow. 2MgO The molar mass of O2 is 32. 0 g/mol. What mass, in grams, of O2 is required to react completely with 4. 00 mol of Mg? 2. 00 64. 0 128 256.
Answer:
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The mass of oxygen required for complete utilization of 4 mol of Mg has been 64 g. Thus, option B is correct.
The balanced equation for the reaction has been:
[tex]\rm 2\;Mg\;+\;O_2\;\rightarrow\;2\;MgO[/tex]
From the balanced chemical equation, for complete utilization of 2 moles of Mg, 1 moles of oxygen has been used.
The given moles of Mg has been 4 mol. The moles of oxygen required can be given as:
[tex]\rm 2\;mol\;Mg=1\;mol\;O_2\\4\;mol\;Mg=2\;mol\;O_2[/tex]
Thus, the moles of oxygen required has been 2 mol for complete utilization of 4 mol Mg.
The mass from moles can be calculated as:
[tex]\rm Mass=Moles\;\times\;molecular\;mass[/tex]
The molecular mass of oxygen has been 32 g/mol.
The mass of oxygen has been:
[tex]\rm Mass=2\;\times\;32\;g\\Mass=64\;g[/tex]
The mass of oxygen required for complete utilization of 4 mol of Mg has been 64 g. Thus, option B is correct.
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What are electron Subshells?
Answer:
a subshell is a subdivision of electron shells that are separated by electron orbitals.
Explanation:
(subshells are labeled s,p,d, and f in an electron configuration)
What is the frequency of the above wave?
Answer: is a measurement of how often a recurring event such as a wave occurs in a measured amount of time
Explanation:
When Brian first sorted out his thoughts, he figured this was the first day after the crash and what did he think would happen next?
It should be noted that when Brian first sorted out his thoughts, the first thing that he thought would happen next is that he would probably be rescued that day.
It should be noted that in Chapter 5 of Hatchet, Brian wakes up in the forest and then, he realized that he was desperately thirsty.
When Brian first sorted out his thoughts, he figured this was the first day after the crash and that he would probably be rescued that day. He believed that he was going to wither up and die if he doesn't get anything that he'll drink.
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10 facts about “molecules”
Answer:
Explanation:
A perfect diamond is a single molecule made of carbon atoms.
DNA is a super long molecule that has information uniquely describing every human being.
When two or more atoms chemically bond together, they form a molecule.
They are very small in size.
They have space between them.
They are in constant random motion.
molecules move when Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
In 1926, French physicist Jean Perrin received the Nobel Prize in physics for proving, conclusively, the existence of molecules.
Molecules can exist in free state because they are very stable.
The smallest particle of a compound capable of existing on its own is a Molecule-not a atom.
At room temperature Bromine is a liquid and lodine is a solid, what can be inferred
about the intermolecular forces of these two elements?
Answer:
Explanation:
The intermolecular forces are stronger in Iodine, meaning that its molecules are stronger and can hold that solid structure at room temperature, where Bromine cannot due to its IMF's being weaker.
Write out a correctly formatted hypothesis that describes how the amount of hydrogen gas produced with be affected by the concentration of acid.
To solve such this we must know the concept of acid and base reaction. Therefore, the concentration of acid decides the concentration of hydrogen gas evolved.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
When creating mixture the amount of hydrogen gas is directly related to the concentration of the acid mixture, the higher the concentration level The more hydrogen gas would be produced.
Therefore, the concentration of acid decides the concentration of hydrogen gas evolved.
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Did the flower used in this investigation come from a plant that reproduces sexually or asexually? Explain your answer. (If u don’t know the answer don’t answer.) (No picture) (I didn’t know what category)
Answer:
Asexually
Explanation:
Plant's cannot reproduce sexually
In which of the following reactions is chlorine (Cl) oxidized? Br2 2Cl⒠→ Cl2 2Br⒠Cl2 2e⒠→ 2Cl⒠2ClO3⒠12H → Cl2 6H2O 2Na Cl2 → 2NaCl.
The reaction in which Cl has been oxidized is [tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]. Thus, option A is correct.
In a reaction, the oxidation has been defined as the loss of electrons by the atom, while reduction has been depicted as the gain of electrons.
The loss of electrons imparts a positive charge to the atom, while the gain of electrons imparts a negative charge to the atom.
In the following reactions, the Cl has been given as:
[tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]The chlorine has loses the electron and is converted to diatomic molecule. Thus, the Cl has been oxidized. The oxidation state of Cl has also been increased from -1 to 0.
[tex]\rm Cl_2\;+\;2\;e^-\;\rightarrow\;2\;Cl^-[/tex]The chlorine gains 2 electrons in the reaction and has been reduced.
[tex]\rm 2\;ClO_3^-\;+\;12\;H^+\;\rightarrow\;Cl_2\;+6\;H_2O[/tex]There has been no change in the oxidation state of chlorine. Thus, Cl has not been oxidized.
[tex]\rm 2\;Na\;+\;Cl_2\;\rightarrow\;2\;NaCl[/tex]The chlorine gains electron and has been converted to the Cl ion. With the gain of electrons, Cl has been reduced.
The reaction in which Cl has been oxidized is [tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]. Thus, option A is correct.
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Please help
How do we read chemical formulas?
Answer:
Download Science All formulasExplanation:
Hope it helpsWhy does liquid move like it does when heated on the right side?
Answer:Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids.
Explanation:Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.
Why is water so susceptible to pollution?(1 point)
It's a universal solvent.
It occurs naturally as a solid, liquid, and gas.
It can be found underground.
Only 3% of Earth's water is freshwater.
formulas and nomenclature binary ionic compounds worksheet
To name the binary ionic compounds it is necessary to observe which is the metal and the non-metal that compose them.
This name is made as follows:
The name of the metal is shown.The name of the non-metal is presented in abbreviated form.Add the suffix "ide" at the end.An example of this can be seen in the binary ionic composite KCL that receives the name Potassium Chloride, since potassium is the metal and chlorine is the non-metal.
It is important to remember that binary ion compounds are electrically charged ionic molecules formed by a metal and not a non-metal.
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Al + FeCl2 → Fe + AlCl3.
Answer:
Hope this helps :)AlCl3 + Fe = Al + FeCl2
Chemical Equation Details aluminum chloride + iron = aluminum + iron(ii) chloride
[tex]\text{Balanced reaction:}\\\\2\text{Al} + 3\text{FeCl}_2 \longrightarrow 3\text{Fe} + 2\text{AlCl}_3[/tex]
what are three different facts about mass
plz tel will give brainlyest
Answer: all mass takes up space. everything has mass. Theres a unit of mass called a slug thats not the bug!
Explanation:
what are the relationships among bond order, bond length, and bond energy?
Explanation:
When a bond is strong, there is a higher bond energy because it takes more energy to break a strong bond. This correlates with bond order and bond length. When the bond order is higher, bond length is shorter, and the shorter the bond length the greater the bond energy.
True/False: For the same system, heterogeneous nucleation will occur at less undercooling than homogeneous nucleation.
Answer:
True.Explanation:
same system, heterogeneous nucleation will occur at less undercooling than homogeneous nucleation.
Can someone give me an example of a Hypothesis?
Answer:
if I eat more vegetables,then I will lose weight faster.
002 (part 1 of 2) 10.0 points
1.5 mol HCl and 3.7 mol NaOH react accord-
ing to the equation
HCl + NaOH → NaCl + H2O.
If the limiting reactant is HCl, calculate the
amount of NaCl formed.
1. 1.9
2. 2
3. 1.1
4. 1.5
5. 1
6. 1.8
7. 1.2
8. 1.3
9. 1.4
10. 1.7
Answer in units of mol.
mol,
Answer:
4) 1.5 mol
Explanation:
Well, the equation is already balanced and the mole to mole ratio of reactants and products are all 1. So if the limiting reactant is HCl and you have 1.5 mol, you do the mole to mole ratio with NaCl and since it is 1 to 1, there'd be 1.5 mol of NaCl.
Calculate the Enthalpy for the following reaction using the listed thermochemical equations:
Please help
Answer:
896.5
Explanation:
You want to manipulate each equation individually.
First Equation: Keep it how it is, because N2 is the same in the final and 1st equation
Second Equation: Multiply the enthalpy by 4 because you want the H2Os to be equal
Third Equation: Switch the sign of the enthalpy because you want toe H2O2 on the other side of the equation, and multiply by 2 to match the coefficient
Answer:
this might be of help to u
The balanced equation shows how sodium chloride reacts with silver nitrate to form sodium nitrate and silver chloride. NaCl AgNO3 Right arrow. NaNO3 AgCl If 4. 00 g of NaCl react with 10. 00 g of AgNO3, what is the excess reactant? AgCl NaCl AgNO3 NaNO3.
The reactant that has been present in excess in the reaction has been NaCl. Thus, option B is correct.
The balanced chemical equation has been:
[tex]\rm NaCl\;+\;AgNO_3\;\rightarrow\;NaNO_3\;+\;3\;AgCl[/tex]
From the balanced equation, for complete utilization of 1 mole of sodium chloride, 1 mole of silver nitrate has been used.
The moles of can be given as:
[tex]\text Moles\;=\;\dfrac{m}{mwt}[/tex]
Where, mass of Silver nitrate, [tex]m=10\;\text g[/tex]
Molecular mass of silver nitrate, [tex]mwt=168\9.87\;\text {g/mol}[/tex]
Substituting the values, moles of silver nitrate has been:
[tex]\rm Moles \;AgNO_3=\dfrac{10}{169.87} \\Moles \;AgNO_3=0.058\;mol[/tex]
Mass of sodium chloride, [tex]m=4\;\text g[/tex]
Molecular mass of sodium chloride, [tex]mwt=58.44\;\text {g/mol}[/tex]
Substituting the values, moles of sodium chloride has been:
[tex]\rm Moles\;NaCl=\dfrac{4}{58.44}\\Moles\;NaCl=0.068\;mol[/tex]
From the balanced chemical equation,
[tex]\rm 1\;moles\;AgNO_3=1\;moles\;NaCl\\0.058\;mol\;AgNO_3=0.058\;mol\;NaCl[/tex]
Since, the available moles of NaCl has been 0.06 mol, and used NaCl has been 0.05 mol. Thus, NaCl has been the excess reactant. Hence, option B is correct.
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Answer:
B- NaCl
Explanation:
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Which liquid has more density
Answer:
mercury i think
Explanation:
Answer:
Mercury is the densest liquid at standard conditions for temperature and pressure (STP). Also called quicksilver, mercury has been known for more than 3,500 years. It is an important metal in industry, but it is also toxic
Explanation:
Which statement correctly defines dynamic equilibrium?
At dynamic equilibrium, the rates of forward and reverse reactions are equal.
At dynamic equilibrium, the rate of the forward reaction is higher than the rate of the reverse reaction.
At dynamic equilibrium, the forward and reverse reactions stop.
At dynamic equilibrium, the concentrations of reactants and products are equal.
Answer: at dynamic equilibrium, the rates of forward and reverse reactions are equal.
Explanation:
The correct statement defines dynamic equilibrium "at dynamic equilibrium, the rates of forward and reverse reactions are equal."
What is dynamic equilibrium?The state of a particular system wherein the reversible reaction takes place ceases modifying the ratio of reactants as well as products, but there is still a transfer of substances among the reactants and products is known as dynamic equilibrium.
What is reactions?Chemical reaction can be defined as the a method for creating novel chemicals with unique features.
The correct statement defines dynamic equilibrium "at dynamic equilibrium, the rates of forward and reverse reactions are equal."
Therefore, the correct answer will be option (a).
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If substances B and C are both in the gas phase and are at the same energy level, which of the two substances will need to have more energy transferred out in order to change to the liquid phase? Substance B or Substance C? Explain your answer below.
For Science
Answer:
Substances can change phase—often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.
The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance. It requires energy for a solid to melt into a liquid. Every pure substance has a certain amount of energy it needs to change from a solid to a liquid. This amount is called the enthalpy of fusion (or heat of fusion) of the substance, represented as ΔHfus. Some ΔHfus values are listed in Table 10.2 “Enthalpies of Fusion for Various Substances”; it is assumed that these values are for the melting point of the substance. Note that the unit of ΔHfus is kilojoules per mole, so we need to know the quantity of material to know how much energy is involved. The ΔHfus is always tabulated as a positive number. However, it can be used for both the melting and the solidification processes as long as you keep in mind that melting is always endothermic (so ΔH will be positive), while solidification is always exothermic (so ΔH will be negative).
Which of the following is a correctly balanced equation? A. NaClO3 → NaCl 3O2 B. 2HgO → 2Hg O2 C. 2ZnS O2 → 2ZnO 2SO2 D. 4CO Fe3O4 → 4CO2 Fe E. 2Fe 2Cl2 → 2FeCl3.
Answer:
yes is the anser
Explanation:
i donyt know how to be wrong
The correctly balanced equation among the options is 2HgO → 2Hg + O2.
BALANCING CHEMICAL EQUATION:Balancing a chemical equation means ensuring that the number of atoms of each element on both sides of the equation are the same in accordance to the law of conservation of mass.
To balance a chemical equation, we make use of coefficients, which are numbers placed in front of the element or compound in the reaction.
According to this question, the following equation: 2HgO → 2Hg + O2, is correctly balanced because the number of atoms of Hg (2) and O (2) are the same on both sides.
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How do vascular plants get the water and minerals they need to live?
through de' la' dasini
How does VSEPR theory describe the double bonds between the central carbon atom and each oxygen atom of Co2?
The double bonds in CO2 are counted as single regions of electron density.
The valence shell electron pair repulsion theory VSEPR is a description of the shape of molecules based on the number of electron pairs that surround the central atom in the molecule. Double bonds are counted as a single region of electron density.
Hence, the two double bonds in CO2 are counted as two regions of electron density around the central carbon atom. Hence, the molecule is liner at a bond angle of 180 degrees.
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