Answer: Oxidation number of Cl in CA clo4
Explanation:
As there are four oxygen atoms, the net oxidation state is (-2) x 4 = (-8). Therefore chlorine (Cl) has an oxidation state of (-1) - (-8) = (+7).
hello can you please help me to solve above fill in the blank questions
Answer:
C2H5OH is a formula of ethyl alchol or ethanol.
alkenes are characterisized by carbon-carbon double bond.
burning is an example of exothermic reaction
atomic number of element is x the symbol of its ion is +1 bcz it will lose one electron
if temperature increases then rate of chemical reaction increases
Explanation:
i hope this will help you :)
When seeds germinate, roots grow downward and stems grow upward in response to gravity. This response to gravity is called _______.
Answer:
geotropism/gravitropism
Explanation:
An element has an electron arrangement of 2,8,1. Which group does it belong to?
Answer:
group 1
Explanation:
because it is an Alkali metal
Which reaction does not involve neutralization? A. H 2 SO 4 + 2NH 3 -------> (NH 4 ) 2 SO 4 B. H 2 SO 4 + BaCl 2 --------> BaSO 4 + 2HCl C. H 2 SO 4 + CuO -----> CuSO 4 + H 2 O D. H 2 SO 4 + 2NaOH ----> Na 2 SO 4 + 2H 2 O
Answer:
B. H2SO4 + BaCl 2 --------> BaSO4 + 2HCl
Explanation:
Neutralization reactions are characterized by their reactants of acids and bases reacting to form salt and water. All of the options except B, have formation of salt and water. Also, B is more likely a percipitation reaction (also a double displacement reaction) and not neutralization.
Which sentence best explains the movement of the oxygen molecules over time
Answer:
this option is the correct they move to an area with lower oxygen concentration because gas molecules can pass through semi-permeable and do not need transport proteins for the movement
Explanation:
i hope this will help you
can confirm that
They move to an area with a lower oxygen concentration
if the correct answer :)))
Explanation:
ape-x
The amino acid Prolinehas a pk1 of 1.99, pk2 of 10.60. The amino acid Serine has pk1 of 2.21 and a of pk2 of 9.15. If these two amino acids bind together by peptide bond creating the peptide sequence Pro-Ser . What will be the overall charge of this peptide at the physiological pH of 7?
a) overall charge will be neutral
b) overall charge will be neutral on Pro and negatively charged on the Ser
c) overall charge will be negative
d) overall charge will be positive due to the presence of the peptide bond
Answer:
a) overall charge will be neutral.
Explanation:
The Ph value for Pro will be neutral and neutral charge on the Ser. Molecules of atoms generally have neutral electrical charge. If the overall charge of a peptide is negative then it is considered as negative. Pro and Ser amino acids have neutral Ph values.
2 Points
Which intermolecular force would affect melting point the most?
O A. Dipole-dipole attractions
O B. Hydrogen bonding
O C. Nonpolar interactions
O D. Van der Waals forces
Answer:
Hydrogen bonding
Explanation:
Hydrogen bonding is the intermolecular force that would affect melting point the most. Therefore, the correct option is option B.
What is intermolecular force?The electro - magnetic forces of attraction but rather repulsion that act between atoms or other types of nearby particles are examples of intermolecular forces, which mediate interaction between molecules. When compared to intramolecular forces, which include covalent bonds and other forces that hold molecules together, these forces are weaker.
The intermolecular force, which depends on the kinetic energy between atoms as well as the tiny electrically charged positive and negative charges on various sections of a molecule, is the total of all the forces connecting two nearby molecules. Hydrogen bonding is the intermolecular force that would affect melting point the most.
Therefore, the correct option is option B.
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Which of the following best explains the polarity of water (H2O)?
OA.
Since the oxygen atom has more electrons than the hydrogen atoms, it is negatively charged.
ОВ.
Electrons are more attracted to the oxygen atom, so there is a partial negative charge on the oxygen atom.
OC.
Since there are two positive hydrogen atoms and only one negative oxygen atom, the water molecule is positively
charged
OD
Protons are more attracted to the hydrogen atoms, so the hydrogen atoms become positively charged.
Answer:
B). Electrons are more attracted to the oxygen atom, so there is a partial negative charge on the oxygen atom.
Explanation:
The above statement most aptly describes the polarity or uneven distribution of the density of electrons. In water, two hydrogen atoms and one atom of oxygen leading to the formation of polar covalent bonds. Thus, there is the presence of a partial negative charge close to the oxygen atom and partial positive charge near the hydrogen atom as the former has unshared pair of electrons. This polarity of water allows it to dissolve sugar or other ionic substances in it. Thus, option B is the correct answer.
Which one of the following oxide has both acidic and basic properties?
A. MgO
B. N2O
C. Al2O3
D. SO2
Answer:
The answer is C
Explanation:
Aluminium oxide is an amphoteric oxide.
MgO is a basic oxide.
N2O is an acidic oxide.
SO2 is an acidic oxide.
How has the scientific community addressed the safety of chemicals?
Answer:
How has the scientific community addressed the safety of chemicals? ... Existing chemicals are tested if they have never been tested. before
Explanation:
liquids that do not mix are called
Answer:
Immiscible liquids
Explanation:
Immiscible comes from two words; 'im' indicating a negation or a contradiction; and 'miscere' meaning to mix.
Putting the words together, immiscible means not able to mix.
How many electrons would be exchanged in the iron-oxygen redox reaction?
electrons
Answer:
Twelve electrons are exchanged in the iron-oxygen redox reaction.
Explanation:
Oxidation and reduction reactions are complementary processes. Every oxidation must be accompanied by a reduction and vice versa. In fact, the both processes are not essentially different but are different aspects of the same process hence the coinage 'redox reaction'.
In the redox reaction under consideration, iron is the electron donor while oxygen is the electron acceptor. The half equations are shown below;
Oxidation half equation;
4Fe---> 4Fe^3+ + 12e
Reduction half equation;
3O2 + 12e ----> 6O^2-
Ionic equation of the process;
4Fe^3+ + 6O^2- -----> 2Fe2O3
Hence it can be clearly seen that twelve electrons were transferred in the process.
Answer:
6
Explanation:
_____ chemical reactions need a certain amount of activation energy to get started.
A: only exothermic
B: only endothermic
C: All
D: most
Answer:all
Explanation:
Because a reaction does not starts by itself unless some force is applied
The smallest unit that retains the properties of an element is aan)
atom
O molecule
proton
O compound
neutron
O electron
Answer:
Atom
Explanation:
An atom is the smallest unit which represents the an element.
It retains the chemical properties of an element.
The partial pressures of the gases in a mixture are 0.00461 atm O2, 1.78 atm
N2, and 0.975 atm Ar. What is the total pressure of the mixture?
Answer: The total pressure of the mixture is 2.76 atm
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_A+p_B+p_C...[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = ?
[tex]p_{O_2}[/tex] = partial pressure of oxygen = 0.00461 atm
[tex]p_{N_2}[/tex] = partial pressure of nitrogen = 1.78 atm
[tex]p_{Ar}[/tex] = partial pressure of argon = 0.975 atm
putting in the values we get:
[tex]p_{total}=0.00461atm+1.78atm+0.975atm[/tex]
[tex]p_{total}=2.76atm[/tex]
Thus the total pressure of the mixture is 2.76 atm
what happens when sodium and sulfur combine
Answer:
Sodium sulfide is the chemical compound with the formula Na2S, or more commonly its hydrate Na2S·9H2O. Both the anhydrous and the hydrated salts are colorless solids. They are water-soluble, giving strongly alkaline solutions. When exposed to moist air, Na2S and its hydrates emit hydrogen sulfide, which smells like rotten eggs. Some commercial samples are specified as Na2S·xH2O, where a weight percentage of Na2S is specified. Commonly available grades have around 60% Na2S by weight, which means that x is around 3. Such technical grades of sodium sulfide have a yellow appearance owing to the presence of polysulfides. These grades of sodium sulfide are marketed as 'sodium sulfide flakes'.
Contents
1 Structure
2 Production
3 Reactions with inorganic reagents
4 Uses
4.1 Reagent in organic chemistry
5 Safety
6 References
Structure
Na2S adopts the antifluorite structure,[2][3] which means that the Na+ centers occupy sites of the fluoride in the CaF2 framework, and the larger S2− occupy the sites for Ca2+.
Production
Industrially Na2S is produced by carbothermic reduction of sodium sulfate often using coal:[4]
Na2SO4 + 2 C → Na2S + 2 CO2
In the laboratory, the salt can be prepared by reduction of sulfur with sodium in anhydrous ammonia, or by sodium in dry THF with a catalytic amount of naphthalene (forming sodium naphthalenide):[5]
2 Na + S → Na2S
Reactions with inorganic reagents
The sulfide ion in sulfide salts such as sodium sulfide can incorporate a proton into the salt by protonation:
S2−
+ H+ → SH−
Because of this capture of the proton ( H+), sodium sulfide has basic character. Sodium sulfide is strongly basic, able to absorb two protons. Its conjugate acid is sodium hydrosulfide (SH−
). An aqueous solution contains a significant portion of sulfide ions that are singly protonated.
S2−
+ H
2O {\displaystyle {\ce {<=>>}}}{\displaystyle {\ce {<=>>}}} SH−
+ OH−
(1)
SH−
+ H
2O {\displaystyle {\ce {<<=>}}}{\displaystyle {\ce {<<=>}}} H
2S + OH−
(2)
Sodium sulfide is unstable in the presence of water due to the gradual loss of hydrogen sulfide into the atmosphere.
When heated with oxygen and carbon dioxide, sodium sulfide can oxidize to sodium carbonate and sulfur dioxide:
2 Na2S + 3 O2 + 2 CO
2 → 2 Na2CO3 + 2 SO2
Oxidation with hydrogen peroxide gives sodium sulfate:[6]
Na2S + 4 H2O2 → 4 H
2O + Na2SO4
Upon treatment with sulfur, polysulfides are formed:
2 Na2S + S8 → 2 Na2S5
Uses
Sodium sulfide is primarily used in the kraft process in the pulp and paper industry.
It is used in water treatment as an oxygen scavenger agent and also as a metals precipitant; in chemical photography for toning black and white photographs; in the textile industry as a bleaching agent, for desulfurising and as a dechlorinating agent; and in the leather trade for the sulfitisation of tanning extracts. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of rubber chemicals, sulfur dyes and other chemical compounds. It is used in other applications including ore flotation, oil recovery, making dyes, and detergent. It is also used during leather processing, as an unhairing agent in the liming operation.
Reagent in organic chemistry
Alkylation of sodium sulfide give thioethers:
Na2S + 2 RX → R2S + 2 NaX
Even aryl halides participate in this reaction.[7] By a broadly similar process sodium sulfide can react with alkenes in the thiol-ene reaction to give thioethers. Sodium sulfide can be used as nucleophile in Sandmeyer type reactions.[8] Sodium sulfide reduces1,3-dinitrobenzene derivatives to the 3-nitroanilines.[9] Aqueous solution of sodium sulfide can be refluxed with nitro carrying azo dyes dissolved in dioxane and ethanol to selectively reduce the nitro groups to amine; while other reducible groups, e.g. azo group, remain intact.[10] Sulfide has also been employed in photocatalytic applications.[11]
Explanation:there you go
When sodium combines with sulphur, it formed sodium sulphide. When it interacts with sulfur, polysulfides are produced. Additionally, heat causes sodium sulfide to oxidize fast. Sulfur dioxide and sodium carbonate are the end products.
What is sulphur ?Chemical element sulfur has the letter S and atomic number 16. It is multivalent, nonmetallic, and plentiful. Sulfur atoms normally combine to create cyclic octatomic molecules, which have the chemical formula S₈.
At room temperature, elemental sulfur is a crystalline solid that is brilliant yellow. It is employed in the production of fertilizer, water treatment, mineral extraction, oil refining, and automobile batteries.
Other uses for compounds based on sulfur include vulcanizing rubber, bleaching paper, and producing goods like cement, detergents, and insecticides.
Thus, When sodium combines with sulphur, it formed sodium sulphide.
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16. State one advantage and disadvantage
of rusting
Answer:
Advantage:
It forms ferrous oxide which is used as a pigment for glasses
Disadvantage:
It destroys the appearance of the metal and weakens it.
Answer:
Advantage: Rusting provides a thin durable shell to prevent the metal from getting more corroded.
Disadvantage: Rusting weakens material due to prolonged corrosive action.
Explanation:
How many of the following are true concerning balanced chemical equations? I. The number of molecules is conserved. II. The coefficients for the reactants tell you how much of each reactant you are given. III. Atoms are neither created nor destroyed. IV. The coefficients indicate the mass ratios of the substances used. V. The sum of the coefficients on the reactant side equals the sum of the coefficients on the product side.
Answer: I. The number of molecules is conserved.
III. Atoms are neither created nor destroyed
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
For example: [tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
Thus in the reactants, there are 4 atoms of hydrogen , 2 atoms of oxygen and 2 atoms of sodium.Thus there will be 4 atoms of hydrogen, 2 atoms of oxygen and 2 atoms of sodium in the product as well.
CALCULATE THE RMM OF , CA(OH)2, AL2SO4.
Answer:
The RMM of Ca (OH)2 is
40+ (16+1)2
40+(17)2
40+34
74
The RMM of Al2SO4 is
(27×2)+32+(16×4)
54+32+64
=150
Explanation:
Note that the RAM of:
Ca=40
O=16
H=1
Al=27
S=32
Vincent graduated from college with a degree in horticulture and now owns a local plant nursery. He maintains a blog titled, "How to Live a Happy Life,” and writes that people can lead happier lives by varying the routes they usually take home from work. Which statement best evaluates this claim? This claim is scientific because it is based on Vincent’s personal experience. This claim is scientific because other people have taken his advice and are now happier. This claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology. This claim may not be accurate because most people follow the same route home.
Answer:
this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.
Explanation:
Answer:
this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.
Explanation: give the branliest to the otherperson :)
Which condition must be met in order for an equation to be balanced? The elements in the reactants are the same as the elements in the products. There are fewer elements in the reactants than there are in the products. The number of atoms in the reactants is greater than the number of atoms in the products. The number of atoms in the reactants equals the number of atoms in the products. PLEASE HELP 17 POINTS
Answer:
The number of atoms in the reactants equals the number of atoms in the products.
The correct answer as to which condition must be met in order for an equation to be balanced would be that the number of atoms in the reactants equals the number of atoms in the products.
In a reaction, the law of conservation of matter, mass. or atom must always hold true. For an equation of a reaction to be balanced, the number of atoms of each element in the reactants must equal to the number of atoms of the elements in the products respectively, even though their states might have changed.
For example in the reaction below:
NaOH + HCl ---> NaCl + H2O
The number of atoms of Na, O, H, and Cl on the reactant side is the same as the product side of the equation. The equation is, thus, said to be balanced.
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Which solution containing one mole per dm 3 of the compound will have the lowest pH? A. Ethanoic acid B. Hydrochloric acid C. Sodium chloride D. Sodium hydrogen carbonate
The solution containing one mole per [tex]dm^{3}[/tex] of Hydrochloric acid will show the lowest pH, as the concentration of hydrogen ions produced by the dissociation is higher for Hydrochloric acid.
pH of the solution can be calculated as a measure of the concentration of the hydrogen ions [tex][H^{+}][/tex] present in it.
[tex]pH=-log [H^{+}][/tex]
Hydrochloric acid is a strong acid and hence, dissociates completely in to [tex]H^{+}[/tex] and [tex]Cl^{-}[/tex] ions.The higher the concentration of hydrogen ions lower will be the pH value of the solution.Ethanoic acid is a weak acid and hence dissociates less readily than hydrochloric acid. This can lead to a higher pH.The dissociation of Sodium chloride will not lead to the production of any hydrogen ions. And hence, the pH will be high (around [tex]7[/tex])Sodium hydrogen carbonate will dissociate in to sodium ions[tex](Na^{+} )[/tex] and bicarbonate ions [tex](HCO_{3} ^{-} )[/tex]. And hence, the pH will be high (around [tex]8.3[/tex]).Among the solution containing one mole per [tex]dm^{3}[/tex] of these four compounds, the hydrogen ion concentration will be higher for Hydrochloric acid.
Thus, we can say that the correct answer is Hydrochloric acid.
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Which of the following is sold on a commodity market A. bicycles B. Wool C. Sweaters D. Jewelry
Answer:
wool
Explanation:
this is because wool is used in manufacturing clothes and other materials for human use.
Use the information in the square to answer the questions about copper. A purple box has C u at the center and 29 above. Below it says copper and below that 63.55. How many protons are in an atom of copper? How many electrons are in an atom of copper? How many neutrons are in an atom of copper? Round your answer to the nearest whole number.
Answer:
29 protons
29 electrons
35 neutrons
Explanation:
Answer:
29
29
35
Explanation:
Give examples of partially miscible liquids.
Answer:
honey and water, butanol and water, and potassium chloride and water.
Explanation:
Answer:
A pair of liquids, like 1-butanol and water, which separates into two layers, but still partially mix, is said to be partially miscible.A pair of liquids is considered partially miscible if there is a set of compositions over which the liquids will form a two-phase liquid system. ... And then at some temperature (known as the upper critical temperature), the liquids become miscible in all compositions.Some examples of miscible solutions include water and organic compounds such as alcohols, aldehydes and ketones. Immiscible solutions include water and many types of oils. A miscible solution is any solution that can be mixed together to form one liquid phase.This idea of solubility can be extended to the interactions between two liquids. If two liquids with similar polarities (and, therefore, similar intermolecular interactions) are combined, the liquids are said to be miscible with each other because the will mix to form a homogeneous solution.
A 5-column table with 2 rows. Column 1 is labeled number of protons, with entries A and D; column 2 is number of neutrons, with entries 7 and E; Column 3 is atomic number, with entries B and 26; Column 4 is Mass Number, with entries 15 and 56, and Column 5 is Element (symbol) with entries C and F. Using the periodic table, complete the table to describe each atom. Type in your answers.
Answer:
A = 8
B = 8
C = Oxygen (O)
D = 26
E = 30
F = Iron (Fe)
Explanation:
protons neutrons atomic number mass number element
A 7 B 15 C
D E 26 56 F
mass number = protons + neutrons
E = 56 - 26 = 30
A = 15 - 7 = 8
protons = atomic number
B = 8
D = 26
From atomic number:
C = Oxygen (O)
F = Iron (Fe)
Answer:
8
8
o
26
30
fe
Explanation:
edge 21
When a solution of NaI reacts with a solution of AgNO3, what is the net ionic equation?
Na+ (aq) + NO3- (aq) → NaNO3 (s)
Na (aq) + NO3 (aq) → NaNO3 (s)
No reaction
Ag+ (aq) + Cl- (aq) → AgCl (s)
Answer:
Ag⁺(aq) + I⁻(aq) → AgI(s)
Explanation:
Net ionic equation is a way to write a chemical equation in which you are listing only the species that are participating in the reaction.
In the reaction:
AgNO₃(aq) + NaI(aq) → AgI(s) + NaNO₃(aq).
The ionic equation is:
Ag⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + I⁻(aq) → AgI(s) + Na⁺(aq) + NO₃⁻(aq).
Now, listing only the species that are participating in the reaction:
Ag⁺(aq) + I⁻(aq) → AgI(s)Which of the following are true of phases?Check all that apply.A.The particles in a liquid are in a fixed location.B.Gases have more kinetic energy than liquids or solids.C.The particles of a solid vibrate.D.Gases have weak intermolecular forces between the atoms or molecules.
Answer:
D. Gases have weak intermolecular forces between them
for (3), why is it incorrect?
Complete the following ionic equation: [tex]Zn + 2Ag^{+} ---\ \textgreater \ ......... + ..........[/tex]
Answer: [tex]Zn+2Ag^+\rightarrow Zn^{2+}+2Ag[/tex]
Explanation:
Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously and the number of electrons lost is equal to the number of electrons gained.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
Anode : [tex]Zn\rightarrow Zn^{2+}+2e^-[/tex]
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
Cathode : [tex]2Ag^++2e^-\rightarrow 2Ag[/tex]
Thus the complete ionic equation will be :
[tex]Zn+2Ag^+\rightarrow Zn^{2+}+2Ag[/tex]
