The element that has been reduced in the redox reaction [tex]AgNO_3 + Na NaNO_3 + Ag[/tex] is silver (Ag). A redox (reduction-oxidation) reaction involves the reduction of one element by the gain of electrons and the oxidation of another element by the loss of electrons.
When sodium (Na) loses one electron to generate [tex]NaNO_3[/tex] in this reaction, sodium changes from its neutral state (with a zero oxidation number) to a positive oxidation state (+1). On the other hand, when silver (Ag) in AgNO3 gets one electron to create Ag, it moves from a +1 oxidation state to a neutral state (with zero oxidation number).
Silver is the element that undergoes reduction in this process because reduction entails a gain of electrons, reducing it from its +1 oxidation state to its neutral state.
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*LAST QUESTION , PLEASE HELP* Why does the land around an once active coal mine remain barren? a.) Empty coal mines are flooded with acid rain so no life forms can survive. b.) Ozone is formed from hydrocarbons which prevents the growth of plants. c.) The ground where the coal was mined is acidic so few plants can grow there.
The land around a once active coal mine remains barren because empty coal mines are flooded with acid rain, so no life forms can survive. The correct option is a.
What is a coal mine?Coal mines are the places where coal is extracted from. Mines are the place where abundant minerals are present. These minerals are extracted from these places to use the minerals as fuel, making other metals and things. The three types of coal mines are long wall mining, retreat mining, and room-and-pillar mining.
Mines are places that are dig or excavated to very deep, so the topsoil goes into the valleys hence no nutrients in the soil, no plants, and no life.
Thus, the correct option is a.) Empty coal mines are flooded with acid rain, so no life forms can survive.
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Which of the following is NOT a reason atom economy is important?
A. Minimize waste of non-renewable reactants
B. To reduce the amount of water used in cooling reactions
C. Make as much product as possible
D. Increase energy use during reactions
Reset Selection
Answer:
Increase energy use during reactions
Explanation:
Answer via Educere/ Founder's Education
Increase energy use during reactions. Hence, option D is correct.
What is an atom?An atom is any particle of matter at its most basic level which contains at least one proton.
A reaction with a high atom economy is important in industry because it uses lesser natural resources, produces less waste, and is better for the environment. It is also cheaper to produce and more sustainable.
Increasing energy used during reactions is NOT a reason atom economy is important.
Hence, option D is correct.
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Calculations
Weight of acetanilide = 2.7g
Theoretical yield of Nitroaniline =
Weight of para-nitroaniline = 1.5g
Percentage yield of para-nitroaniline =
Please help me which this and show me how you get the answer thank you
Answer:
Theoretical yield: 2.75g of paranitroaniline
Percentage yield: 54.5%
Explanation:
In strong-acid medium, acetanilide (Molar mass: 135.16g/mol) reacts producing para-nitroaniline (138.12g/mol) in a 1/1 reaction.
Theoretical yield of para-nitroaniline is the mass produced assuming a yield of 100%. That is:
2.7g acetanilide × (1mol / 135.16g) = 0.020 moles of acetanilide.
Assuming a yield of 100% are 0.020 moles of paranitroaniline. Theoretical yield is:
0.020 moles × (138.12g / mol) =
Theoretical yield: 2.75g of paranitroanilinePercentage yield is:
(Actual yield / theoretical yield) × 100
Actual yield was 1.5g and percentage yield will be:
Percentage yield: (1.5g / 2.75g) × 100
Percentage yield: 54.5%Calculate the number of g of KCN that will react with 1.06 mol of HCl.
Answer:
68.9 g of KCN.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
KCN + HCl → KCl + HCN
From the balanced equation above,
1 mole of KCN reacted with 1 mole of HCl.
Next, determination of the number of mole of KCN needed to react with 1.06 moles HCl.
This is illustrated below:
From the balanced equation above,
1 mole of KCN reacted with 1 mole of HCl.
Therefore, 1.06 moles of KCN will also react with 1.06 moles of HCl.
Finally, we shall convert 1.06 moles of KCN to grams.
This can be obtained as follow:
Molar mass of KCN = 39 + 12 + 14 = 65 g/mol.
Mole of KCN = 1.06 moles
Mass of KCN =...?
Mole = mass /Molar mass
1.06 = mass of KCN / 65
Cross multiply
Mass of KCN = 1.06 x 65
Mass of KCN = 68.9 g
Therefore, 68.9 g of KCN is needed to react with 1.06 moles of HCl.
A certain polyatomic ion contains 49 protons and 50 electrons. What's the net charge of this ion?
A. +1
B.-2
C. +2
D. -1
Answer:
The charge - 1
Because the charge of proton is + and electron -
Charge = +49 +(-50)
= - 1
Explanation:
To what volume will a 2.33 L sample of gas expand if it is heated from 10.0°C to 100.0°C? Group of answer choices 0.233 L 4.41 L 23.3 L 3.76 L 3.07 L
Answer:
3.07 L
Explanation:
This question describes Charles law, which shows the direct relationship of the absolute temperature to its volume when the pressure is kept constant. The Charles' law equation is:
V1/T1 = V2/T2
Where; V1 is the volume of the gas at an initial state
V2 is the volume of the gas at a final state
T1 is the absolute temperature of the gas at an initial state
T2 is the absolute temperature of the gas at a final state.
According to the question, V1 = 2.33L, V2 = ?, T1 = 10°C, T2 = 100°C
The absolute temperature unit, which is Kelvin, need to be used. Hence, we convert °C to Kelvin using:
T(K) = T(°C) + 273.15
T1 (K) = 10°C + 273.15 = 283.15K
T2 (K) = 100°C + 273.15 = 373.15K
To solve for V2 in the above Charles law equation, we make V2 the subject of the formula by saying:
V2 = V1 × T2 / T1
V2 = 2.33 × 373.15 / 283.15
V2 = 869.4395/ 283.15
V2 = 3.0705
Hence, the gas will be expanded to a volume of 3.07L when heated from 10.0°C to 100.0°C.
Convert the pressure 525.4 torr to kPa.
Select one:
O a. 70.0
Ob. 3940
Oc. 9.90
O d. 525
Answer:
A. 70.0 kpa
Explanation:
Given
Pressure = 525.4 torr
Required
Convert to kPa
From standard unit of conversion;
[tex]1\ torr = 0.133\ kPa[/tex]
Multiply both sides by 525.4
[tex]525.4 * 1\ torr = 525.4 * 0.133\ kpa[/tex]
[tex]525.4\ torr = 70.047572\ kpa[/tex]
[tex]525.4\ torr = 70.0\ kpa[/tex] (Approximated)
From the list of given options, option A is the closest answer after 525.4 torr is converted to its kpa equivalent
Which of the following is an example of ionization of an acid?
O NH3(g) + H2O(1)
→ NH4+(aq) + OH (aq)
None are correct
NaCl(aq) + AgNO3(aq)
→ AgCl(s) + NaN Na(aq)
HF(aq) + H2O(1)
→ H3O+(aq) + F (aq)
Au(NO3)3(aq) + Cu(s)
→ Au(s) + Cu(NO3)2(aq)
Answer:
NH3(g) + H2O(1) → NH4+(aq) + OH (aq)
HF(aq) + H2O(1) → H3O+(aq) + F (aq)
Explanation:
Acid-base reactions are chemical reactions involving acids and bases. Acids tend to ionize/dissociate in water, a property which determines their strength. Ionization of an acid refers to the acid losing its hydrogen ion (H+) in water solution. An acid ionizes or dissociates to form a conjugate base.
A strong acid is so because it ionizes completely in water i.e. loses all its hydrogen ion (H+) while a weak acid partially ionizes in water.
In the chemical reactions;
1) NH3(g) + H2O(1) → NH4+(aq) + OH (aq)
H20 loses its hydrogen ion (H+) in this reaction to form an anion (OH-). Hence, water (H20) is an acid in this case which ionizes to form a conjugate base (OH-). This is an example of ionization of acid.
2) HF(aq) + H2O(1) → H3O+(aq) + F (aq)
Hydrogen fluoride (HF) loses its hydrogen ion (H+) in the presence of water to form anion (F-). The HF is the acid while F- is it's conjugate base. Thus, an example of ionization of acid
Question 8 of 50
2 Points
Which type of structure would contain a few non-metal atoms?
O A. Giant covalent structure
B. Simple covalent structure
C. Metallic lattice
OD. Ionic lattice
Reset Selection
Answer:
b
Explanation:
b
The type of structure would contain a few non-metal atoms are simple covalent structure. Option B is correct.
What is covalent structure?A covalent bond is a chemical bond between two atoms, ions or molecules in which electron pairs are shared between elements and covalent bond can also be said as a molecular bond.
Covalent bonds form or made by between two non-metallic atoms or compounds with identical or same electronegativity for example hydrogen and oxygen are two non metals and bond to form water molecule.
Therefore, type of structure would contain a few non-metal atoms are simple covalent structure. Option B is correct.
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Which of the following is most difficult to reduce?
O A. Cu2+
O B. Aut
C. Ni2+
D. Na+
Answer:
D Na+
Explanation:
due to shielding effect
Calculate the number of moles of BaF2 in a 10.0 g sample of BaF2.
Answer:
The number of moles = 0.06 moles
Explanation:
i) Formula
Number of moles = Mass of the sample ÷ Molar masses of the substances
ii) Number of moles = 10.0 ÷ (137)+(19×2)
= 10.0 ÷ 175
= 0.06 moles
Answer:
0.06moles
Explanation:
I did this question already and I got it right.
which of the following shows how rate depends on concentrations of reactants?
Answer:
option c
Explanation:
Rate = k(A)¹(B)²
Answer:
c
Explanation:
a p e xxxxxxxxx
Which type of molecule is shown below?
Answer:
[tex]\boxed{\mathrm{Alkene}}[/tex]
Explanation:
The hydrocarbon shown has a double bond. Hydrocarbons with double bonds are known as alkenes.
Cyclic alkanes have cyclic structure.
Alkanes only have single bonds.
Alkynes have triple bonds.
Answer:
Alkene
Explanation:
A molecule having a double bond between its atoms is called an alkene.
1. Consider the following equilibrium system: C(s) + CO2(g) 2CO(g)
∆Hr° = +120 kJ
Indicate the shift in equilibrium, if any, for each of the following scenarios: a) Adding CO2(g) b) Adding C c) Lowering the temperature d) Increasing pressure e) Adding a catalyst
Answer:
a) equilibrium shifts towards the right
b) equilibrium shifts towards the right
c) equilibrium shifts towards the left
d) has no effect on equilibrium position
e) has no effect on equilibrium position
Explanation:
A reversible reaction may attain equilibrium in a closed system. A chemical system is said to be in a state of dynamic equilibrium when the rate of forward reaction is equal to the rate of reaction.
According to Le Chateliers principle, when a constraint such as a change in temperature, pressure, volume or concentration is imposed upon a system in equilibrium, the equilibrium position shifts in such a way as to annul the constraint.
When the concentration of reactants is increased, the equilibrium position is shifted towards the right hand side and more products are formed. For an endothermic reaction, the reverse reaction is favoured by a decrease in temperature. Increase in pressure has no effect on the system since there are equal volumes on both sides of the reaction equation. Similarly, the addition of a catalyst has no effect on the equilibrium position since it speeds up both the forward and reverse reactions to the same extent.
For the reaction C + 2H2 - CH2, how many moles of hydrogen are required to produce
19.26 mol of methane, CHA?
Select one:
O a. 19.26
O b. 38.52
O c. 15.0
O d. 24.7
Answer: 38.52 moles of hydrogen will be required to produce 19.26 mol of methane
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} CH_4=19.26moles[/tex]
The balanced chemical reaction is:
[tex]C+2H_2\rightarrow CH_4[/tex]
According to stoichiometry :
1 mole of [tex]CH_4[/tex] is produced by = 2 moles of [tex]H_2[/tex]
Thus 19.26 moles of [tex]CH_4[/tex] will be produced by =[tex]\frac{2}{1}\times 19.26=38.52moles[/tex] of [tex]H_2[/tex]
Thus 38.52 moles of hydrogen will be required to produce 19.26 mol of methane
Consider the reaction below.
NH4 + H20 - NH3 + H30"
Which is an acid-conjugate base pair?
O NHA and NH3
O NH4" and H30*
O H20 and NH3
O H20 and H20"
Answer:
The correct ans is....
Option B) NH4" and H30*
Explanation:
NH4" and H30* is an example of conjugate pair
Hope this helps....
Pls mark my ans as brainliest :)PLS, PLS, PLSThe acid-conjugate base pair : ( B ) NH₄⁺ and H₃O⁻
The chemical reaction is
NH₄ + H₂O --> NH₃ + H₃O
Acid-conjugate base pairAn acid-conjugate base pair is a pair that consists of two substances that are different from each other just by the presence or absence of a proton ( H⁺ ) it helps to determine the relative strengths of acids and bases.
Hence we can conclude that the acid-conjugate base pair : ( B ) NH₄⁺ and H₃O⁻.
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Which atomic model shows the atom as a positively charged sphere with negatively charged electrons spread throughout
it?
A. Dalton's model
B. Thompson's model
C. Bohr's model
D. None of these
Answer:
B) Thomson's Model
Explanation:
Dalton's Model simply consisted of small spheres that represented atoms, and Bohr's model had a nucleus in the center with electrons orbiting in strict orbits, not randomly spread throughout. Thomson's plum pudding model, however, had an overall positively charged atom with many electrons spread throughout. If you search up "Plum Pudding Model" you can visually understand this.
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The chemical equation shown represents photosynthesis. Carbon dioxide plus A plus light with a right-pointing arrow towards B plus oxygen. The arrow has an x above it. What is the role of substance A in photosynthesis? (5 points) Question 4 options: 1) It stores chemical energy for plants and animals. 2) It traps light energy and converts it into chemical energy. 3) It combines with carbon dioxide and light to form glucose. 4) It combines with carbon dioxide and light to form hydrogen.
Answer:
2
Explanation:
What is a common misconception about not following food regulations?
Explanation:
Most Americans have encountered some bacteria at some point in their lives, whether it was acquired from restaurant food or a grocery store, which caused them to claim they later had food poisoning. There are multiple nasty bacteria that can cause this, and there are many misconceptions about how they end up in our food, and what the best ways to avoid them are. To be forewarned is to be forearmed, so here are several misconceptions about food safety and the practices involved that can leave us satisfied, or ruin our day with stomach churning nastiness.
Answer:it decreases customer satisfaction
Explanation:
Which of the following observations would indicate that a material is a pure substance?
O It does not dissolve in water.
O It changes color after heating.
O It cannot be physically broken down into different types of atoms.
O It can be physically broken down into different types of molecules
Save and Fyit
Noy
Answer:
C. It cannot be physically broken down into different types of atoms.
The atomic number of manganese (Mn) is 25. What's the electron configuration for manganese?
A. [Ar] 3s5 4p2
B. [Ne] 3d7
C. [Ne] 452 3p5
D. [Ar] 3d5 4s2
Answer:
[tex]\boxed{\sf D. \ [Ar] \ 3d5 \ 4s2}[/tex]
Explanation:
Manganese is a group 7 transition metal with an electronic configuration of [Ar] 3d5 4s2.
The atomic number of manganese (Mn) is 25. The electron configuration for manganese is [Ar] [tex]\rm 3d^5 4s^2[/tex]. Therefore, the correct option is option D.
The electron configuration depicts how electrons are dispersed throughout an atom's energy levels and orbitals. Manganese (Mn) has an atomic number of 25, meaning that the atom contains 25 electrons. Manganese (Mn) has the following electron configuration: [tex]\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5[/tex]
We can use the noble gas notation to indicate the electron configuration in a more compact form by indicating the noble gas that comes before the electron configuration. The noble gas that comes before manganese (Mn) is argon (Ar), whose electron configuration is[tex]\rm 1s^2 2s^2 2p^6 3s^2 3p^6[/tex]. The electron configuration of manganese (Mn) can be expressed as [tex][Ar] 3d^5 4s^2[/tex] using noble gas notation.
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Which of the following solute(s) would form an electrolytic solution in water? CH4, KI, fecl3
Answer:
kl
Explanation:
According to the concept of solubility and electrolysis , KI would form an electrolytic solution in water.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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substitution reaction always produce two products. The first is organic and the other is (________).
Answer:
nucleophilic
Explanation:
Answer:
I think its nucleophilic.
Explanation:
When the equation below is balanced with the lowest possible whole number coefficients, what is the sum of the coefficients? Ca(s) + HCl(g) → CaCl2(s) + H2(g)
Answer:
ca(s)+hcj(g)cacI 2 (s)+H2(g)
Explanation:
The equation below is balanced with the lowest possible whole-number coefficients, the sum of the coefficients Ca(s) + HCl(g) → CaCl2(s) + H2(g) is
ca(s)+hcj(g)cacI 2 (s)+H2(g).
What is the sum of the coefficients when the equation for the combustion of ammonia is balanced using the smallest possible whole numbers?The sum of the coefficients is 2+3+4+3=12.
What type of reaction is Ca 2hcl → CaCl2 H2?Type of Chemical Reaction: For this reaction, we have a single displacement reaction. Balancing Strategies: In this reaction Calcium (Ca) metal is reacting with Hydrochloric acid (HCl). the Ca replaces the H in HCl and we end up with CaCl2 and H2.
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What is the pH of a solution that has [OH-] = 4.0 x 10-'M?
Answer: 13.60
Explanation:
[tex]\frac{10^{-14} }{4.0 x 10^{-} }[/tex] = 2.5 x10^-14 this =[tex][H_{3} O^{+} ][/tex]
pH = -log[tex][H_{3}O^{+} ][/tex]
pH= -log( 2.5 x10^-14) = 13.60
Read the two passages. Silicon is an element that is directly below carbon on the periodic table. Silicon can form bonds similar to carbon. Silicon-silicon single bonds require 222 kJ/mol of energy to break. Based on the statements, how much energy would it take to break a carbon-carbon single bond?
Answer:
100kj/mol
Explanation:
If an atom of rubidium (Rb) were to ionize, it would ______ ______ electron(s).
Pretty sure it would lose electrons.
If an atom of rubidium (R b) were to ionize, it would loose electron(s).
What do you mean by ionization of atom ?Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons,.
Ionization is when a neutral atom or molecule can be converted into electrically charged atoms by gaining or losing a free electron.
Ionization happens during the process of a chemical reaction. To ionize an atom or a molecule, either loses or gains electrons―the electron which is either gained or lost forms an ion.
Therefore ,if an atom of rubidium (R b) were to ionize, it would loose electron(s).
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What causes hydrogen bonding?
bonding of a covalently bonded hydrogen atom with an unshared electron pair
motion of electrons
attraction between ions
sharing of electron pairs between two adjacent hydrogen atoms
Answer:
the tendency of some atoms in molecules to attract electrons more than their accompanying atom.
Explanation:
Determine which reaction has the highest activation energy
Answer:
we need to look at what actually happens to reactant molecules during a chemical. in order for the reaction to take place , some or all of the chemical bonds in the reactants must be broken so that the new bonds, those of the products , can form.
Answer:
Graph 3
Explanation:
got it right.
Question 9 of 50
2 Point
When hydrogen is burned in the presence of oxygen it will form water, as
per the equation: 2H2 + O2 -> 2H20. Which types of reactions does this
fall under?
I. synthesis
II. decomposition
III. single replacement
IV. double replacement
V. combustion
O A. I and V
Answer:
V. Combustion
Explanation:
Combustion is a reaction where a substance is burned - in this case, hydrogen is burned.