Answer:
[Ne] 3s² 3p³
Explanation:
this is the answer and give me likes and vote for me
How many formula units of NaCl are
in 116 g NaCl? The molar mass of
NaCl is about 58 g/mol.
116 g
The number of formula units in 116 g of NaCl is 1.204×10²⁴ formula units
Avogadro's hypothesis1 mole of NaCl = 6.02×10²³ formula units
But
1 mole of NaCl = 58 g
Thus,
58 g of NaCl = 6.02×10²³ formula units
How to determine the formula units in 116 g of NaCl58 g of NaCl = 6.02×10²³ formula units
Therefore,
116 g of NaCl = (116 × 6.02×10²³) / 58
116 g of NaCl = 1.204×10²⁴ formula units
Thus, 1.204×10²⁴ formula units are present in 116 g of NaCl
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A severe systemic reaction to an allergen causing serious symptoms that develop very quickly is known as.
Answer: Anaphylaxis
Explanation:
I have a nut allergy, and this has happened to me once. The doctors also told me a lot about anaphylaxis, and I like to learn about myself.
I hope this helps!! :)
The flotation process used in metallurgy involves Multiple Choice the roasting of sulfides. separation of gangue from ore. electrolytic reduction. chemical reduction of a metal. zone refining.
The flotation process used in metallurgy involves the separation of gangue from ore.
How does the flotation process work?The various wettability qualities of a material's surface are the foundation of flotation operations. The basic principles of flotation are quite similar to those of a sink and float process, where the materials' relative densities to the medium in which they are deposited determine the basis of the separation.
What is the process of separating minerals from gangue known as?Mineral processing, mineral dressing, or ore dressing are all terms for the process of separating minerals from gangue. It is an important and frequently necessary part of mining. Depending on the type of minerals used, the process may be difficult.
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A chemist conducted a precipitation reaction in which they added 35.5 mL of 0.125 M copper(II) sulfate to 50.00 mL of 0.150 M sodium hydroxide. The anion that was left over was subsequently precipitated by adding calcium chloride to the reaction mixture. What mass of the calcium chloride was added
The mass of CaCl2 is 0.076gram.
The molar mass of a compound is just the molar hundreds of every detail inside the compound brought up. Since the molar mass of Calcium is 40.08 g and the molar mass of Chlorine is 35.45, it might be 40g.08g+35.45g+35.45g (with 2 Chlorines in step with the subscript.) That leaves you with 110.98 g
Calcium and chlorine are the 2 factors in our instance. The molar loads of Ca (forty.08g/mol) and Cl (35.45g/mol) need to then be determined. Now that we have the masses of calcium and each chlorine atom, we are able to truly place them together to get the whole compound's molar mass, which is a hundred and 10.98 g/mol.
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To illustrate the arrangements of particles in a liquid , a teacher instructed 20 students
Answer:
instructed 20 students to do what
Explanation:
Mrs. Smith has the following chemistry results: CK: moderately increased LD: moderately increased LD-1 : increased The probable diagnosis is:
Diagnosis of Mrs. Smith:
Diagnosis for Mrs. Smith for having CK: moderately increased LD: moderately increased LD-1: increased symptoms is "Myocardial infarction".
Myocardial infarction:
A myocardial infarction, commonly known as a heart attack, occurs when the blood supply to a portion of the heart muscle is inadequate or the cardiac muscle isn't getting enough oxygen in one or more places. The more time that goes by without receiving care to improve blood flow, the more damage the heart muscle sustains.
The majority of myocardial infarctions are brought on by underlying coronary artery disease, which deprives the myocardium of oxygen when coronary arteries are blocked. Myocardial necrosis and cell death can occur if the myocardium is continuously deprived of oxygen.
Signs of myocardial infarction:
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0.916 g of iron is heated in air. The resulting procuct weighs 1.178 g. What is the formula of the compound
The formula of the metal oxide is FeO.
When a metal is burned in the air or oxygen the product formed is metal oxide. This is called the combustion reaction of metals.
Calculations:
It is given that the weight of iron (Fe) is 0.916 g. After the reaction, it forms iron oxide that has the weight 1.178 g. The weight of the metal before and after the reaction must have remained same, only the addition of oxygen has taken place.
The mass of oxygen is calculated as:
Mass of oxygen = 1.178 g - 0.916 g
= 0.262 g
The molar mass of oxygen is 16.00 g/mol. The number of moles of oxygen is calculated as:
Moles of O = 0.262 g/16.00 g/mol
= 0.0164 mol
The molar mass of Fe is 55.845 g/mol. The number of moles of Fe is calculated as:
Moles of Fe = 0.916 g/55.845 g/mol
= 0.0164 mol
The number of moles of Fe and O are equal. Hence, the molar ratio between Fe and O is 1:1. Therefore, the formula of the iron oxide is FeO.
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A 1M solution of barium nitrate is added to the solution. What is the solubility of barium hydroxide after this addition
The solubility of the barium hydroxide after the addition of a 1M solution of barium nitrate is 0.035M
Barium nitrate is a salt that dissolves entirely in solution and is soluble. This indicates that before the salt dissolves, there will be a one molar concentration of barium ions. We may anticipate that the equilibrium will be pushed to the left and the barium hydroxide will be less soluble because we have increased the product side of the reaction. The common ion effect is the name given to this shift in equilibrium.
To ascertain the salt's solubility, we shall use an ICE table.
I. There is a one molar concentration of barium ions (from the barium nitrate) in the solution before the salt starts to dissolve, but there are no hydroxide ions present.
C. The unknown increases in each ion can be referred to as 1+ and 2x, respectively, because every dissolved molecule of barium hydroxide will produce one barium ion and two hydroxide ions. Observe how the previously added one molar concentration in the solution will be combined with the increased barium ion concentration.
E. At this point, we set the solubility equation to the constant representing the solubility product.
[tex]Ba(OH)_{2}[/tex] ⇔ [tex]Ba^{2+} + 2OH^{-}[/tex]
Ksp is defined as:
Ksp = [tex][Ba^{2+}] + [OH^{-}]^{2}[/tex]
5 x [tex]10^{-3}[/tex] = [tex][Ba^{2+}] [OH^{-}]^{2}[/tex]
It added a solution of 1M of [tex]Ba^{2+}[/tex]
5 x [tex]10^{-3}[/tex] = [tex][1M][/tex] [tex][OH^{-}]^{2}[/tex]
The addition of barium hydroxide [tex]Ba(OH)_{2}[/tex] gives:
[tex][Ba^{2+}] = 1M + x[/tex]
[tex][OH^{-}]^{2}[/tex] [tex]= 2x[/tex]
Replacing:
5x[tex]10^{-3}[/tex] = [tex][1+x][/tex] [tex][2x]^{2}[/tex]
[tex]10^{-3} = 4x^{2} + 4x^{3}[/tex]
[tex]x = 0.035 M[/tex]
Your question is incomplete, but most probably your full question was to consider the following balanced equation for the dissociation of barium hydroxide in an aqueous solution.
[tex]Ba(OH)_{2} (s) = Ba^{2+} (aq) + 2OH (aq)\\Ksp = 5* 10^{-3}[/tex]
A 1M solution of barium nitrate is added to the solution. What is the solubility of barium hydroxide after this addition?
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Which is NOT a physical property of a matter sample?
A.texture
B.toxicity
C.hardness
D.magnetism
Answer:
B.toxicity
Explanation:
Toxicity is talking about how harmful something is to you in terms of molecular and chemical level. Thus, it is chemical property.
Answer:
texture is not a physical property of a matter sample
All of the following molecules except _________ make up a homologous series. Question 21 options: CH3CH2CH2CH3 CH3CHCHCH3 CH3CH2CH3 CH3CH2CH2CH2CH3 CH3CH2CH2CH2CH2CH3
All of the following molecules except CH₃CH₂CH₃ make up a homologous series.
What is Homologous Series ?A homologous series is a series of compound having same general formula and same functional group.
What is the general formula of alkene and alkane ?The general formula of alkane is CₙH₂ₙ₊₂
The general formula of alkene is CₙH₂ₙ
CH₃CH₂CH₃ (Propane) is the third homologous series of alkane which satisfies the general formula of alkane.
Thus from the above conclusion we can say that All of the following molecules except CH₃CH₂CH₃ make up a homologous series.
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The lowest concentration that can officially reported for any constituent in drinking water is known as the
What is the legal limit?
The lowest concentration that can officially be reported for any constituent in drinking water is known as the "Legal Limit".
Contamination of water:
The level that safeguards human health and that water systems can attain with the finest technology is reflected in the regulatory limit for a contaminant.
How does it occur:
Plumbing components are the main way that lead and copper enters the drinking water. The health effects of lead and copper exposure can range from brain damage to stomach discomfort.Nitrogen, bleach, salts, pesticides, metals, bacterial toxins, and human or animal medications are examples of chemical pollutants. Organisms in the water are biological pollutants. Other names for them include microorganisms and microbiological pollutants.In order to control corrosion, the system must take a variety of additional measures if lead concentrations reach an action threshold of 15 ppb or copper concentrations exceed an action level of 1.3 ppm in more than 10% of measured customer taps.
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A 13.5 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 23.5 mL of 0.434 M barium hydroxide are required to neutralize the nitric acid, what is the percent by mass of nitric acid in the mixture
The percent by mass of nitric acid in the mixture is 3.36 %
2 HNO3 + Ba(OH)2 --->Ba(NO3)2 + 2H2O
so 1 mole Ba(OH)2 neutralizes 2 mol HNO3
moles of Ba(OH)2 present = molarity of base* volume of base
= 0.229 M * 15.6 ml
= 3.5724 milli mols
mols of HNO3 neutralized = 2* mols of Ca(OH)2 used
= 2* 3.5724 milli mols = 7.1448 x10^-3 mols
molar mass of HNO3 = 63.01 g/mol
mass of HNO3 present = molar mass * mols of HNO3
= 63.01 g/mol * 7.1448 x10^-3 mols
=0.4502 g
mass of sample = 13.4 g
mass % = mass of HNO3/mass of sample * 100
= 0.4502/13.4 *100
= 3.36 %
Nitric acid is a colorless, fuming, and distinctly corrosive liquid that could be a not unusual laboratory reagent and an important commercial chemical for the manufacture of fertilizers and explosives.
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The electron configurations of some elements are given. based on the electron configurations, which elements can likely form ions with multiple charges?
Correct option:
The elements form ions with multiple charges is given by option B and D, i.e., Iron and Cobalt
The electronic configurations of elements(assumed):
[tex]A. \,Zinc\,-[Ar]\,3d^{10}4s^{2}\\\\B.\,Iron\,-[Ar]3d^64s^2\\\\C.\, Sodium\, [Ne]3s^1\\\\D.\,Cobalt\,[Ar]3d^74s^2\\\\E.\,Silver\,[Kr]4d^{10}5s^1[/tex]
These electronic configurations are based many factors-
1. (n+l) energy rule which states higher the value of (n+l), higher will be the energy of the orbital.
2. Fully filled and half filled orbitals are more stable than partially filled orbitals.
Now,
Elements of d-block have multiple oxidation states. Zinc has fully filled d-orbitals. It is not considered as d-block metal as it has only 1 oxidation state, i.e, +2.
Sodium exists only in +1 oxidation state.
Also Silver exists in +1 oxidation state.
So, the correct answer is Iron and Cobalt which can form ions with multiple charges.
Correct options are B and D.
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A chemical reaction in which one element replaces another element in a compound can be catergorized as a
Answer:
[tex]\huge\boxed{\sf Single \ displacement \ reaction}[/tex]
Explanation:
Displacement reaction:A reaction in which an element displaces or replaces another element of a compound is called a displacement reaction.Types:There are 2 types:
1. Single displacement reaction:If one element displaces 1 other element of a compound, it is called single displacement reaction.Example: [tex]CuSO_4 +Fe \longrightarrow \ FeSO_4 + Cu[/tex]Here, 1 element (Fe) displaces 1 other element (Cu) of a compound.2. Double displacement reaction:If two elements in two compounds displace one another, it is called double displacement reaction.Example: [tex]CuSO_4+NaOH \longrightarrow Cu(OH)_2 + Na_2SO_4[/tex]Here, Copper and sodium both displace each other.[tex]\rule[225]{225}{2}[/tex]
How do fission nuclear reactions differ from fusion nuclear reactions?
1*Fission reactions involve the conversion of matter into energy, but fusion reactions do not.
2*Fusion reactions involve the conversion of matter into energy, but fission reactions do not.
3*Fission reactions are used to generate electricity for consumers, but fusion reactions are not.
4*Fusion reactions are used to generate electricity for consumers, but fission reactions are not.
Fission nuclear reactions differ from fusion nuclear reactions because fission reactions involve the conversion of matter into energy (option 1).
What are nuclear fission and fusion?Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
On the other hand, nuclear fusion is the combining of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy.
Therefore, fission nuclear reactions differ from fusion nuclear reactions because fission reactions involve the conversion of matter into energy.
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What are the 3 components of an expressway that allows car to enter onto the road?.
The three components of an expressway entrance are the Entrance ramp, acceleration lane, and merging area.
what is an expressway?An expressway is a road that is specifically designed for high-speed traffic. These roads often have few crossings, few places of access or departure, and a divider between lanes for opposing-direction traffic.
It was mainly designed to make it easier for traffic to move at high speeds and in huge volumes.
Freeways, parkways, and turnpikes are examples of expressways. A highway is a primary route, but an expressway is a multilane highway.
Its principal objective was to facilitate the movement of heavy, fast-moving vehicles.
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A 80.0 g sample of copper (specific heat = 0.20 J/g °C ) is heated and then added to 100 g water at 22.3 °C. The final temperature of the water and copper is 26.9°C. What is the original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water?
The original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water is 147.08°C.
How to calculate temperature?The temperature in a calorimetry experiment can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperatureFor a calorimetry;
Q(water) = -Q(metal)
mc∆T (water) = -(mc∆T) (metal)
100 × 4.18 × 4.6 = - (80 × 0.20 × {26.9 - x}
1922.8 = -430.4 + 16x
16x = 2353.2
x = 147.08°C
Therefore, the original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water is 147.08°C.
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The molecular structure of NCl3 is Select one: a. pyramidal b. none of these c. octahedral d. trigonal planar e. bent
Correct option:
The molecular structure of NCl3 is a. pyramidal
Molecular structure of NCl3:
The molecular geometry of NCl3 can also be ascertained using the AXN approach.
The center atom is shown as A.The bound pairs of electrons to the main atom are shown by the letter X.The core atom's lone pair of electrons is represented by the letter N.The center atom in the NCl3 lewis dot structure is nitrogen, which possesses three pairs of bound electrons as well as one single electron.
Consequently, the NCl3 formula becomes AX3N1.
Therefore, if a molecule has the formula AX3N1, its shape is trigonal pyramidal, and its electron geometry is tetrahedral, according to the VSEPR chart and it undergoes [tex]sp^{3}[/tex] hybridization.
Reasons for incorrect options:
b. None of these: As pyramidal is one of the options given in the question. So, none of these is incorrect.
c. Octahedral: Electron geometry takes into account both bond pairs and lone pairs of electrons, whereas molecular geometry solely takes into account electrons' bonds when determining the structure of any molecule. As NCl3 has three bound pairs and one unpaired pair. Therefore, NCl3's electron geometry is tetrahedral while its molecular geometry is trigonal pyramidal, as seen by the VSEPR chart. Hence, octahedral is an incorrect option.
d. trigonal planar: If a molecule has three atoms or groups bound to a central atom and no lone electron pairs, it is said to be trigonal planar. But here in NCl3, it has three atoms and one lone electron pair. So, trigonal planar is not the correct option for NCl3.
e. bent: The lone pair on nitrogen generates repulsion between bond pairs and the lone pair, which causes the bond angle of NCl3 to slightly decreasing, making it 107.1°. Because of the lone pair on the nitrogen, which causes electrons to repel one another and bent the structure overall, NCl3 has a slight polarity. This permanent dipole moment is caused by the unequal charge distribution within the structure. But trigonal pyramidal is best to describe the molecular structure of NCl3. Hence is an incorrect option.
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PLEASE HELP!! What is the concentration [H3O+] of a solution with a pH of 13.2? Is the solution acidic, basic, or neutral?
[tex]\\ \tt\leadsto pH=-log[H^+][/tex]
[tex]\\ \tt\leadsto -log[H^+]=13.2[/tex]
[tex]\\ \tt\leadsto log[H^+]=-13.2[/tex]
[tex]\\ \tt\leadsto [H^+]=antilog(-13.2)=6.3\times 10^{-14}M[/tex]
The concentration of [H3O+] will be 6.3 x [tex]10^{-14}[/tex] M
pHMathematically, pH = -log [H+] or -log [H3O+]
With a pH of 13.2:
-log [H3O+] = 13.2
log [H3O+] = -13.2
[H3O+] = 6.3 x [tex]10^{-14}[/tex] M
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Indicate the total number of
(a) p electrons in n (z=7)
(b) s electrons in si (z=14)
(c) 3d electrons in s (z=16)
The total number of :
(a) p electrons in n (z=7) is 3
(b) s electrons in si (z=14) is 6
(c) 3d electrons in s (z=16) is 0
Electronic configuration:
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electron configurations adhere to a standard nomenclature in which all atomic subshells that contain electrons are arranged in a sequence with the number of electrons they each hold expressed in superscript.
The electronic configuration of z=7 (nitrogen) is 1s²2s²2p³
Total number of p electrons = 3
The electronic configuration of z=14 (silicon) is 1s²2s²2p⁶3s²3p²
Total number of s electrons = 2+2+2=6
The electronic configuration of z=16 (sulphur) is 1s²2s²2p⁶3s²3p⁴
Total number of 3d electrons = 0
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Answer:
3, 6, 0
Explanation:
Based on the electron configuration of the two atoms, predict the ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the compound. 1522s22p63523p64sl Potassium 1$22s22p63s23p5 Chlorine
The metal cationic (+) atom to nonmetal anionic (-) atom ratio in the compound formed between Potassium and Chlorine is 1:1.
What is a compound?A compound is made up of two or more atoms that are chemically combined together. In this case, we have the atoms; Potassium and Chlorine.
The electronic configuration of the atoms is not shown here but the metal cationic (+) atom to nonmetal anionic (-) atom ratio in the compound formed between Potassium and Chlorine is 1:1.
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2. A sample of a gas is occupying a 1500 mL container at a pressure of 3.4 atm and a temperature of 25
C. If the temperature is increased to 75 °C and the volume is increased to 2000 ml, what is the new
pressure?
3. A sample of a gas is occupying a 450 mL container at a pressure of 167 kPa and a temperature of 295 K.
If the pressure is increased to 230 kPa and the volume is decreased to 400 mL, what is the new
temperature in K?
I
4. A sample of gas is occupying a 3.6 L container at a pressure of 9.2 atm and a temperature of 298 K. If
the volume is increased to 5.3 L and the pressure is decreased to 7.3 atm, what is the new
temperature?
pleaseeee hurry thank you!!
2. The new pressure, given the data is 3.0 atm
3. The new temperature in K is 361 K
4. The new temperature in K is 348 K
2. How to determine the new pressureInitial volume (V₁) = 1500 mLInitial pressure (P₁) = 3.4 atmInitial temperature (T₁) = 25 °C = 25 + 273 = 298 K New temperature (T₂) = 75 °C = 75 + 273 = 348 K New Volume (V₂) = 2000 mLNew pressure (P₂) = ?The new pressure of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(3.4 × 1500) / 298 = (P₂ × 2000) / 348
Cross multiply
P₂ × 2000 × 298 = 3.4 × 1500 × 348
Divide both sides by 2000 × 298
P₂ = (3.4 × 1500 × 348) / (2000 × 298)
P₂ = 3.0 atm
3. How to determine the new temperatureInitial volume (V₁) = 450 mLInitial pressure (P₁) = 167 KPaInitial temperature (T₁) = 295 KNew pressure (P₂) = 230 KPaNew Volume (V₂) = 400 mLNew temperature (T₂) =?The new temperature of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(167 × 450) / 295 = (230 × 400) / T₂
Cross multiply
T₂ × 167 × 450 = 295 × 230 × 400
Divide both sides by 167 × 450
T₂ = (295 × 230 × 400) / (167 × 450)
T₂ = 361 K
4. How to determine the new temperatureInitial volume (V₁) = 3.6 LInitial pressure (P₁) = 9.2 atmInitial temperature (T₁) = 298 KNew Volume (V₂) = 5.3 LNew pressure (P₂) = 7.3 atmNew temperature (T₂) =?The new temperature of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(9.2 × 3.6) / 298 = (7.3 × 5.3) / T₂
Cross multiply
T₂ × 9.2 × 3.6 = 298 × 7.3 × 5.3
Divide both sides by 9.2 × 3.6
T₂ = (298 × 7.3 × 5.3) / (9.2 × 3.6)
T₂ = 348 K
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Greenhouse gases act to __________ temperatures by __________ thermal infrared radiation. Group of answer choices increase; reflecting decrease; absorbing and releasing increase; absorbing and releasing decrease; blocking
Greenhouse gases act to increase temperatures by absorbing thermal infrared radiation.
We have already learned that Earth's atmosphere is composed often of nitrogen and oxygen. Those gases are transparent to incoming solar radiation. they may be also transparent to outgoing infrared radiation, which means that they do not take in or emit sun or infrared radiation.
The multiplied quantities of greenhouse gases human sports are adding to the environment have dissatisfied the balance that has been in location for the reason that ceases of the closing ice age, including greater greenhouse gases decreases the amount of infrared radiation energy leaving the atmosphere.
Greenhouse gases inside the ecosystem time and again absorb and re-radiate infrared radiation (warmth). strength radiated from Earth's surface as warmth, or infrared radiation is absorbed and re-radiated by using greenhouse gases, impeding the loss of warmth from our surroundings to area.
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How many moles of silver can be produced from silver nitrate from 1 mole of zinc?
Answer:
Answer: 6.5 moles of silver metal is formed in the given chemical reaction. The moles of excess reagent left are 0.55 moles.
Explanation:
To calculate the moles of silver formed and the moles of excess reagent left after the reaction, we need to balance the equation first and need to find the limiting and excess reagent.
The balanced chemical equation is:
Zn + 2AgNO3 ---> Zn (NO3)2 +2Ag
By Stoichiometry:
2 moles of Silver nitrate reacts with 1 mole of Zinc metal
So, 6.5 moles of silver nitrate will react with = 1/2 x 6.5 = 3.25 moles of zinc metal
The required amount of zinc metal is less than the given amount of zinc metal, hence, it is considered as an excess reagent.
Therefore, silver nitrate is the limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
2 moles of silver nitrate produces 2 moles of silver metal
So, 6.5 moles of silver nitrate will produce = 2/2 x 6.5 = 6.5moles of silver metal.
Number of moles of excess reagent left after the completion of reaction = (3.8 - 3.25)moles = 0.55 moles
Hence, 6.5 moles of silver metal is formed in the given chemical reaction. The moles of excess reagent left are 0.55 moles.
What range on the glycemic index (GI) corresponds to a high glycemic impact food? 70 and above 56 to 69 1 to 55 1 to 35
Answer: 70 and above
Explanation:
This is a fact.
I
4. A 1320 g block of lead initially at 35.0°C absorbs 3044 J of heat. What is the final temperature of the
lead? (The specific heat of lead is 0.16 J/g °C)
Answer:
49.41° C
Explanation:
DeltaQ = m c T
3044 = 1320 * .16 * T where T is the temperature change
T = 14.41
35 + 14.41 = 49.41 C
PLEASE ANSWER AS QUICKLY AS POSSIBLE THANK YOU SO MUCH
Eli uses this thermometer to measure the temperature of a liquid. He reports his
results as 36 degrees. Is this a good description?
A. This is a perfect description because it gives both a number and a unit
B. This description is clear and can be understood by other measures
C. This description needs a unit describing the system of measurement.
D. This description needs a decimal point to be a good description
Answer:
This description needs a unit describing the system of measurement.
In an endothermic reaction, the ______ have more energy than the _______.
A. reactants, products
B. surroundings, products
C. products, reactants
D. reactants, surroundings
Answer:
C
Explanation:
If the products have a higher energy level than the reactants then the reaction is endothermic.
In an endothermic reaction, the reaction mixture absorbs heat from the surroundings. Therefore, the products will have a higher energy than the reactants and ΔH will be positive.
In an exothermic reaction, the reaction mixture releases heat to the surroundings. Therefore, the products will have a lower energy than the reactants and ΔH will be negative.
PLS HELP!
1. Explain why your solutions have a purple color after the iron reagent is added. Yes, the answer is because it is absorbing the other colors. What is absorbing the other colors?
2. Explain why the spectrophotometer is ‘blanked’ with the iron reagent. Why couldn’t deionized water be used?
Question 1
Fe(III) forms a chelate complex with salicylic acid which has purple color. therefore, when a solution is made either with salicylic acid or with aspirin having trae amount of salicylic acid in it, we see color formation in solution due to the resulting complex formed.
Question 2
The Fe(III) itself absorbs some light and gives an absorbance value for the solution. Therefore, it is necessary to blank the spectrophotometer with a Fe(III) solution prior to measurement of test solutions.
What is the pH of a solution with a [H3O+] concentration of 3.4 x 10-¹¹ M?
The pH of the solution will be 10.47.
what is pH?The pH of a solution is mathematically given as:
pH = - log [[tex]H^+[/tex]] of -log [[tex]H_3O^+[/tex]]
Thus, in this case, with [[tex]H_3O^+[/tex]] of 3.4 x 10-¹¹ M:
pH = -log 3.4 x [tex]10^-^1^1[/tex] = 10.47
Thus, the pH of the solution will be 10.47.
More on pH can be found here: https://brainly.com/question/15289741
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