Answer:
Stirring the salt and water
Crushing the salt so the grains are smaller
Explanation:
Another way that is not in the choices that would increase the rate of dissolving of a solute in the solvent is heating the solvent. This increases the kinetic energy of the particles hence increasing collision rates. This helps increase the dissolution of the solute.
Stirring helps break down the solute to smaller particles. Smaller particles have a larger surface area to volume ration on which collision with solvent molecule can occur hence faster dissolution.
Which of the following best describes a fission reaction involving lithium? (1 point)
A. Two lithium atoms form bonds with each other, absorbing a large amount of energy.
B. The nuclei of lithium atoms join together to form heavier isotopes, and energy is released.
C. An atom of lithium absorbs electrons, undergoes an increase in energy level, and splits into fragments.
D. The nucleus of an atom of lithium splits, resulting in smaller fragments and the release of a large amount of energy.
Nuclear power plants produce a great amount of energy using fission reactors. However, there are safety risks. Which of the following risks are related to using nuclear power plants? (1 point)
A. storage and disposal of radioactive waste
B. production of radioactive atmospheric pollutants
C. improper handling of volatile radioactive chemicals
D. lack of adequate space to carry out reactions involving radioactive materials
Which of the following natural resources does not contribute to global warming or air pollution? (1 point)
A.coal
B.natural gas
C.nuclear power
D.oil
Which of the following statements about natural resources is correct? (1 point)
A. Oil is more difficult to remove from the Earth than coal.
B. Coal is present in small quantities compared to other fossil fuels.
C. Natural gas has a limited supply and an uneven worldwide distribution.
D. Nuclear power produces small amounts of energy from extremely large masses of fuel.
Which of the following natural resources is considered non-renewable? (1 point)
A. biofuel
B. geothermal power
C. nuclear power
D. solar power
Heat energy beneath the Earth's surface heats underground water into steam to operate steam turbines. This describes which of the following resources? (1 point)
A. biofuel
B. geothermal power
C. hydropower
D. nuclear power
Which of the following is the most important challenge in the protection of our environment? (1 point)
A. Getting society to care about environmental issues.
B. Repairing long-term damage done to the environment.
C. Cleaning up after a major polluting event, like an oil spill.
D. Meeting society's needs while being responsible with natural resources.
Which of the following chemicals is not an ozone-depleting substance in the stratosphere? (1 point)
A. methyl bromide
B.carbon tetrachloride
C. xenon
D. methyl chloroform
Today we use synthetic polymers to replace natural materials such as cotton, wood, and stone. What is one disadvantage of using synthetic materials rather than natural materials? (1 point)
A. Synthetic materials are often easy to produce.
B. Synthetic materials often do not decay naturally.
C. Synthetic materials are often much stronger than natural materials.
D. Synthetic materials are often made from strong radioactive materials.
Some technologies are now available to solve the problem of acid rain, which can alter the pH level of lakes and rivers. Which of the following is the best technology to improve a lake affected by acid rain? (1 point)
A. new alternative energy sources
B. recycling of materials to reduce air pollution
C. an environmentally safe base to neutralize the lake
D. transportation equipment to move all aquatic life to safety
Which of the following human environmental accidents has had devastating effects on groundwater, rivers, oceans, and lakes? (1 point)
A. harmful pesticides
B. nuclear accidents
C. ozone depletion
D. oil spills
When an oil spill occurs in an aquatic environment, what generally is the effect? (1 point)
A. The ecosystem is damaged but quickly rebounds.
B. No serious damage occurs since oil and water do not mix.
C. The abiotic factors are seriously affected, but the biotic are unaffected.
D. The whole ecosystem is negatively affected, and long-term damage may occur.
Which of the following most correctly predicts the impact on the environment if sustainable practices are not followed? (1 point)
A. The ecosystems of the world will be uniformly damaged, but they will rebound quickly.
B. Natural resources will be depleted, and the negative impact may be too severe to recover.
C. The environment will not be adversely affected because the ecosystem of the world is too large.
D. Rain forests will be depleted, but the oceans will be preserved because of their geographical isolation.
Heat pollution occurs when an aquatic environment experiences an increase in temperature, which can result in devastating effects to the ecosystem. Which of the following is a major cause of heat pollution? (1 point)
A. airports and seaports
B. farming and agriculture
C. residential housing areas
D. factories and power plants
Answer:
D, ABC, C, A, ?, B, A, ?, B, C, D, D, C, D
Explanation:
(Answers and explanations in order of questions)
Fission reactions are when the nucleus of an atom splits producing smaller nuclei and energy
Lack of space isn't a safety risk
Coal, natural gases, and oil all are burned to create energy which releases carbon into the atmosphere, polluting it. Nuclear power doesn't burn carbon-based substances and so is fine
I dunno but C and D are wrong
All of them are technically renewable?
Geothermal energy uses the Earth's heat, hence the name
Nothing can happen if people ignore it
Unsure
Synthetic polymers are plastics, which do not decay naturally
A base would react with the acid to neutralise it which is the fastest way to improve the lake
Not pesticides?
Oil spills kill aquatic animals and life quickly, which causes huge damage to ecosystems
If nothing changes nonrenewable things will run out and bad practices will have caused irreparable damage worldwide
Big factories are pumping out the bad stuff
Answer:
1)D) Fission is the process when the nucleus of an atom splits after being bombarded by neutrinos.
2)A) Storage and disposal of radioactive waste is a problem all nuclear power plants face. Most of them dipose the waste underneath the ground. There have even been proposals to send the nuclear waste to the moon.
3)C) Nuclear Power because it does not produce greenhouse gas emissions.
4)A) Oil is more difficult to remove from the Earth than coal This is why, to extract oil, you need an extraction pump and other equipment, while coal can be removed from the earth after digging.
5)A) biofuel - because it comes from agriculture, and agriculture is the biggest contributor to worldwide greenhouse emissions.
6)B) Geothermal power - geothermal power uses the heat from the earth to produce energy.
7)D) - Humans have seemingly unlimited needs and these needs have to be met without destroying the enviroment.
8)C) Xenon - The other three substances listed are classified as Ozone depleting susbstances according to the Ministry of the Enviroment in New Zealand.
9)B) Synthetic materials often do not decay naturally - The best example is plastic, which is a synthetic material that takes hundreds or even thousands of years to decay.
10)C) An environmentally safe base to neutralize the lake - This can be done by oxygenizing the lake.
11)D) Oil spills - Unfortunely, these events have taken place many times. The oil spill in the Gulf of Mexico caused by British Petroleum greatly affected the coasts and waters of Louisiana.
12)D) The whole ecosystem is negatively affected, and long-term damage may occur - An oil spills afects aquatic plants, animals, birds, and the water itself.
13)B) Natural resources will be depleted - Oil might even run out completely. Besides, climate change would raise the sea levels and flood thousands of cities.
14)D) factories and power plants - especially thermal power plants that burn coal to produce energies.
which one of the following ions would be negatively charged with a charge of -2?
10 electrons, 8 protons
18 electrons, 16 neutrons
0 electrons, 2 protons
6 electrons, 8 protons
Answer:
10 electrons 8 protons
Explanation:
p +8 - e10- equals -2
all arenius acid are also bronsted lowry but all arrhenius base are not bronsted lowry base.
Answer:
False
Explanation:
All Arrhenius acids and bases are also Bronsted-Lowry acids and bases.
An Arrhenius base is a compound that dissociates to form hydroxide ions in water.
NaOH(s) → Na^+(aq) +OH^-(aq)
A Bronsted-Lowry base is a proton acceptor.
NaOH is a Bronsted-Lowry base because the hydroxide on can accept a proton from HCl to form water.
Thus, all Arrhenius bases are Bronsted-Lowry bases.
what is the molarity of 2.60L solution that contains 67.3 grams of copper (ii) chloride
Answer:
0.193 M to the nearest thousandth.
Explanation:
Molar mass of copper (ii) chloride
= 63.546 + 2* 35.45
= 134.446 g.
So in 2.60L of 1 M solution there is 134.446 * 2.6
= 349.56 g of copper chloride.
So the molarity of our solution is 67.3 / 349.56
= 0.193 M.
Study the image
Which type of clouds are shown?
cirrocumulus
cumulonimbus
cumulus
stratus
Answer:
The correct answer is Cirrocumulus.
Explanation:
Cirrocumulus : Clouds forming broken layer of small fleecy clouds at higher altitudes.
Cumulonimbus : Clouds forming a towering mass with flat base with flat base at lower altitude
Cumulus : Cloud forming rounded masses heaped or stacked on each other above a flat base , fairly at lower altitudes.
Stratus : Clouds forming continuous horizontal gray sheet, usually during rain or snow.
The given image corresponds to description given as Cirrocumulus.
Answer: A
Explanation:
Which polygon is a base of the triangular prism?
Answer:
a triangle
Explanation:
the name "triangular prism" has triangle in it, just like "rectangular prism" which has a rectangle as a base
Answer:
It’s actually DFG
Explanation:
DFBA
What are the only things that can change in a valid experiment?
Which equation is used to help form the combined gas law?
Answer:
The ideal gas equation
Explanation:
The ideal gas equation is derived from the combination of three gas laws:
Boyle's lawCharles's law Avogadro's law.The ideal gas law is expressed mathematically as: PV=nRT where:
P is pressure
V is volume
n is the number of moles
R is the ideal gas law
T is temperature.
To obtain the combined gas law, we assume that n=1 and this gives:
[tex]\frac{PV}{T}[/tex] = R
Therefore:
[tex]\frac{P_{1} V_{1} }{T_{1} }[/tex] = [tex]\frac{P_{2} V_{2} }{T_{2} }[/tex]
HELPPP ME WITH SICENCE PLZZZZZZ
The group of symbols and numbers that shows the types and numbers of atoms that make up a compound is a _________________.
Answer:
molecules
Explanation:
molecules because the summer like atoms and Sciences sciency to be honest
Where do new root cells from?
A. behind the root cap
B. inside root hairs
C. on top of the root cap
D. under the cortex
Answer:
behind the root cap- A.
How does the concentration of reactants affect the rate of a reaction
Answer:
B
Explanation:
If the concentration is increased, there are more particles to collide with each other, increasing the rate of the reaction.
The concentration of reactants affect the rate of a reaction by increasing the concentration increasing the collision of molecular frequency.
What rate of reaction?The reaction rate refers to how quickly the concentration of such a particular reactant as well as product changes during a chemical reaction.
What is concentration?The abundance of an ingredient divided by the volume of a combination is called concentration. Mass concentration, molar concentration, number concentration, as well as volume concentration are all examples of mathematical descriptions.
The concentration of reactants affect the rate of a reaction by increasing the concentration increasing the collision of molecular frequency.
Therefore, the correct answer will be option B
To know more about rate of reaction.
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Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. Which other model or scientific observation would have also been supported?
This would support Dalton's postulates that proposed the atoms are indivisible because no small particles are involved.
This would support Bohr's prediction about electrons moving in orbits having specific energy.
This would support Bohr's prediction about electrons being randomly scattered around the nucleus in the atom.
This would support Dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.
Answer:
This would support Dalton's postulates that proposed the atoms are indivisible because no small particles are involved.
Explanation:
Experiment using the gas discharge tube by J.J Thomson led to the discovery of cathode rays which are now known as electrons.
Primarily, Thomson's experiment led to the discovery of cathode rays, electrons, as subatomic particles.
If the size of the atoms observed at the cathode is the same as that of the rays,we can conclude that the particles of the rays are the simplest form of matter we can have. This would suggest that the atom is indeed the smallest indivisible particle of a matter according to Dalton.
Answer:
This would support Dalton's postulates that proposed the atoms are indivisible because no small particles are involved.
Explanation:
Dalton proposed that all matter is made up of atoms. Atoms are indivisible. But Thompson’s cathode ray experiment proved that the cathode rays are made up of negatively charged particles which were deflected by both electric and magnetic field. This caused Thompson to propose the Plum and Pudding model of the atom.
Water has a slight negative charge around its oxygen atom, and a slight positive charge around its hydrogen atoms Which type of solvent is water?
A) Saturated
B) no polar
C) polar
D) unsaturated
Answer:
Polar
Explanation:
water is a polar solvent since they can ionize into positive (H+) and negative ions (OH-). they can dissociate into negatively and positively charged poles
what type of bond is SF6
Sulfur hexafluoride or SF6 is an inorganic, greenhouse gas. It is non-flammable, odorless, and colorless, and is an excellent insulator. It is a hypervalent octahedral molecule that has been an interesting topic of conversation among chemistry enthusiasts.
Hope this helps:)
SF₆ has six covalent bonds created by sp³ d² hybridization of the sulfur atom, forming a symmetrical octahedral structure with low reactivity.
The type of bond in SF₆ (sulfur hexafluoride) is a covalent bond. Specifically, the sulfur atom undergoes sp³ d² hybridization, allowing it to form six equivalent bonding pairs with the fluorine atoms. These bonds exhibit both sigma (σ) and pi (π) characteristics, as the S-F bond length is short, which is consistent with π-bonding in addition to σ-bonding.
This indicates that there are no lone pairs of electrons on the sulfur atom. The geometry displayed by SF₆ is highly symmetrical, forming an octahedron where all bond lengths and angles are identical, making it a nonpolar molecule with high symmetry and low reactivity. SF₆ is resistant to chemical attack and exhibits inert characteristics, which makes it useful in applications such as a spark suppressor.
1 Point
For a reaction, a H= 198 kJ. For which value of TA Sis the reaction
spontaneous?
O A. -198 kJ
O B. 198 kJ
O C. Oku
O D. 396 kJ
SUBMIT
The correct answer is D. 396 kJ. ΔG will be negative for this value of TΔS indicating a spontaneous reaction.
Further Explanation:
The value of the Gibbs Free Energy (ΔG) determines the spontaneity of the reaction. To get this value, an equation than shows the relationship among the Gibbs Free Energy (ΔG), enthalpy (ΔH), entropy (ΔS), and temperature is used: [tex]dG \ = dH \ - TdS[/tex]A positive ΔG represents a non-spontaneous reactionA negative ΔG value indicates a spontaneous reaction.A. -198 kJ FALSE because this gives a positive ΔG.
[tex]dG \ = \ 198 \ kJ \ - \ (-198 \ kJ) \\\boxed {dG = 396 \ kJ}[/tex]
B. 198 kJ FALSE because this results in ΔG = 0. The reaction is at equilibrium.
[tex]dG \ = \ 198 \ kJ \ - \ 198 \ kJ \\\boxed {dG = 0}[/tex]
C. 0 kJ FALSE because this results in a positive ΔG.
[tex]dG = 198 \ kJ \ - \ 0\\\boxed {dG = 198 \ kJ}[/tex]
D. 396 kJ TRUE because this results in a negative ΔG.
[tex]dG = \ 198 \ kJ \ - \ 396 \ kJ\\\boxed {dG = -198 \ kJ}[/tex]
Learn More
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A 14.0 gram sample of iron is initially at 414.0 °C. It loses 186.0 J of heat to its surroundings. What is its final temperature?
Answer:
=384.48°C
Explanation:
Change in enthalpy is negative because heat energy is lost to the surroundings.
Change in enthalpy= mass ×specific heat capacity× Change in temperature.
ΔH=MC∅
m=14grams
C of iron= 0.45 J/g°C
∅=?
186.0J= 14.0g × 0.45J/g°C×∅
186=6.3∅
∅=29.5°C
Final temperature= 414.0°C - 29.52°C
=384.48°C
Metallic sodium reacts vigorously with liquid bromine in the following reaction:
if 1 kg of Na is brought into contact with 3 kg of liquid bromine. Presuming that the reaction is quantitative and proceeds to completion, determine the limiting reagent and the quantity of NaBr formed. Determine the amount of excess reagent remaining after the reaction is complete.
First we look at the chemical reaction:
2 Na + Br₂ → 2 NaBr
number of moles = mass / molecular weight
mass = number of moles × molecular weight
number of moles of Na = 1000 / 23 = 43.48 moles
number of moles of Br₂ = 3000 / 160 = 18.75 moles
from the reaction:
if 2 moles of Na are reacting with 1 mole of Br₂
then X moles of Na are reacting with 18.75 moles of Br₂
X = (18.75 × 2) / 1 = 37.5 moles of Na
The limiting reactant is bromine Br₂.
After the reaction is complete you remain with Na as excess reagent.
moles of Na = 43.48 - 37.5 = 5.98 moles
mass of Na = 5.98 × 23 = 137.54 g
if reacting 1 mole of Br₂ produces 2 moles of NaBr
then reacting 18.75 moles of Br₂ produces Y moles of NaBr
Y = (18.75 × 2) / 1 = 37.5 moles of NaBr
mass of NaBr = 37.5 × 103 = 3862.5 g
Answer:
Explanation:
Given parameters:
Mass of Na = 1kg = 1000g
Mass of Br = 3kg = 3000g
Unkown:
Limiting reagent =?
Amount of excess reagent = ?
Quantity of NaBr formed = ?
Solution
The reaction equation can be expressed as:
2Na + Br₂ → 2NaBr
To find the limiting reagent
The limiting reagent is the reagent that is in short supply and it determines the amount of products that can be formed in the reaction.
To find the limiting the reagent, we establish a mole relationship between the reactants. We then check their stoichoimetric expression to see the one in excess and the limiting reagent.
Number of moles of Na = [tex]\frac{mass of Na}{molar mass of Na}[/tex]
molar mass is expressed as g/mol and the Na should also be in grams
Number of moles = [tex]\frac{1000}{23}[/tex] = 43.48mol
Number of moles of Br₂ = [tex]\frac{mass}{molar mass}[/tex]
Number of moles = [tex]\frac{3000}{2x80}[/tex] = 18.75mol
From the balanced reaction equation:
2 mole of Na combines with 1 mole of Br₂
43.48mole of Na would require 43.48/2 mole = 21.74mole of Br₂ to react with.
But the given amount of Br we have is 18.75mole.
Therefore, the reagent in short supply is Bromine. It is the limiting reagent
Quantity of NaBr formed
To find the quantity of NaBr formed, we use the known reagent which is the limiting one to determine its number of moles and eventually the mass. The limiting reagent determines the extent of the reaction.
From the stoichiometric equation:
1 mole of Br₂ will produce 2 mole of NaBr
19.23 mole Br₂ would now yield (18.75 x2)= 37.5mole of NaBr
Mass of NaBr = number of moles of NaBr x molar mass of NaBr
Molar mass of NaBr = 23 + 80 = 103g/mol
Mass of NaBr = 37.5 x 103 = 3862.5g = 3.86Kg
Amount of excess reagent remaining after the complete reaction:
The amount of excess reagent would be derived from the reagent that occurs in excess which is Na:
1 mole of Br₂ reacts with 2 moles of Na
18.75mole of Br₂ will require 2x 18.75 = 37.5mole of Na
Excess mole of Na = (43.48 - 37.5)mole = 5.98mole
Mass of excess Na = number of moles of excess Na x molar mass of Na
Mass of excess Na = 5.98 x 23
Mass of excess Na = 137.54g or 0.14g
How many seconds are in a year scientific notation
Answer:
31557600 seconds in a year or 3.1557600 * 10^7 in scientific notation
Answer:
Don't know. But need the answer
Explanation:
What is an electrochemical cell?
A. Two electrodes separated by an electrolyte that can generate an electrical current.
B. A chemical that, when an electrical current is passed through it, releases a large amount of energy.
C. A biological cell, such as a bacterium, that can generate an electrical current.
D. An electrical circuit formed from chemicals in a solid state rather than metals or metalloids.
A. Two electrodes separated by an electrolyte that can generate an electrical current.
Answer:
Two electrodes separated by an electrolyte that can generate an electrical current.
Explanation:
Answer via Educere/ Founder's Education
What is the strongest intermolecular force between a NaCl unit and an H2O molecule together in a solution?
A.Covalent bonding
B.Dipole-dipole force
C.Hydrogen bonding
D.Ion-dipole force
Answer:
Ion dipole force.
Explanation:
When sodium chloride is dissolved in water it dissociates into sodium ion and chloride ion.
Sodium ion has positive charge on it.
Chloride ion has negative charge on it.
In water molecule, due to electronegativity difference, hydrogen acquires a slightly positive charge and oxygen a slightly negative charge.
This creates a dipole in water molecule.
Now the force of attraction between water and NaCl is in between the ions and the dipole.
Thus the strongest intermolecular force of attraction between NaCl and water is Ion-dipole.
A gas is most likely to exist at which of the following conditions?
A) High temperatures and high pressures
B) High temperatures and low pressures
C) Low temperatures and high pressures
D) Low temperatures and low pressures
Answer:
B. High temp and low pressure
Explanation:
I got an A on my chem final :) Got this right.
Answer:
A gas is most likely to exist at B) High temperatures and low pressures
Explanation:
Ideal gas behaviour is likely to be at high temperature and low pressure .
The causes of deviations from ideal behaviour may be due to the following two assumptions of kinetic theory of gases.
The volume occupied by gas molecules is negligibly small as compared to the volume occupied by the gas.
The forces of attraction between gas molecules are negligible.
Deviation occur for real gases with a minor difference from that of an Ideal gas.
When real gases are at low pressures and high temperatures they behave close enough to ideal gases
What amount of heat is required to raise the temperature of 20 grams of water from 10°C to 30°C? The specific heat of water is 4.18 J/g°C.
Answer:
Explanation:
Heat = m*c * deltat
m = 20 grams
c = 4.19 J/g*C
deltaT = 30 - 10 = 20
Heat = 20 * 4.19 * 20
Heat = 1676 joules or 1.7 kJ depending on what you need.
Answer:
The correct answer for plato/edmentum is C). 1700 joules
where are the first repost of new scientific discoveries published A.) Internet Sites B.) Magazines C.) encyclopedias D.) Scientific journals
Answer:
D
Explanation:
Most if not all fields of research will post their results for others to test and find data to make sure their experiment is theoretically correct.
Scientific journals are the first repost of new scientific discoveries published. Hence, option D is correct.
What is Scientific journals?Scientific papers are also called journal articles, A scientific journal is the best medium for disseminating and popularizing scientific information in the form of accomplishments, discoveries, and research findings.
In order to publish this kind of work, they are typically published in a periodical called a journal.
Thus, option D is correct.
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my tens digit is 2 more than my hundreds digit and my ones digit is 1 more than my tens digit. my Hundreds digit is 5. what number am i?
Answer:
see below
Explanation:
578
100 g of 20% salt solution is mixed with 200g of 10% salt solution. Find out the concentration of the resulting solution.
Explanation:
The total mass is:
100 g + 200 g
= 300 g
The mass of salt is:
0.20 (100 g) + 0.10 (200 g)
= 20 g + 20 g
= 40 g
So the concentration is:
40 g / 300 g
≈ 13.33%
Round as needed.
y^2- 4x² - 4y—8x-16=0
transverse axis
Answer:
line segment of length 8 between the vertices at (-1, -2) and (-1, 6)Explanation:
The equation can be rearranged to standard form.
(y^2 -4y) -4(x^2 +2x) = 16
(y^2 -4y +4) -4(x^2 +2x +1) = 16 +4 -4
(y -2)^2 -4(x +1)^2 = 16
(y -2)^2 /16 -(x +1)^2/4 = 1
This is of the form ...
(y -k)^2/a^2 -(x -h)^2/b^2 = 1
where the transverse axis is 2a and the center is (h, k). Here, a=4, so 2a = 8.
The transverse axis is a vertical line segment of length 8, centered on (-1, 2).
Lemonade is an example of a compound because the particles retain their original chemical properties and identity.
true or false
Answer:
False
Explanation:
Compounds are chemically combined
lemonade is not
If the squeezed lemonade is made by squeezing lemons to extract the juice and mixing it with water and sugar, it would be a homogenous mixture.
If it contains a pulp than it would be heterogeneous
Based on the image, which color will refract the most when passing through a prism?
orange
yellow
green
Answer:
green
Explanation:
Answer:
The answer is Green
Explanation:
I've just answered this on usatestprep.
Determine the freezing point of a 0.51 molal
solution of benzoic acid in chloroform. Chloroform
has a freezing point of -63.5°C and a freezing
point depression constant of 4.70°C.kg/mol.
What is the freezing point of this solution?
°C
Answer:
-65.897°C.
Explanation:
Adding solute to water causes depression of the boiling point.The depression in freezing point (ΔTf) can be calculated using the relation: ΔTf = Kf.m,where, ΔTf is the depression in freezing point of chloroform solution.
Kf is the molal depression constant of chloroform (Kf = 4.70°C.kg/mol).
m is the molality of the solution (m = 0.51 m).
∴ ΔTf = Kf.m = (4.70°C.kg/mol)(0.51 m) = 2.397°C.
∴ The freezing point of the solution = (freezing point of chloroform) - ΔTf = (-63.5°C) - (2.397°C) = -65.897°C.
Answer:
-65.9 and 100.9
Explanation:
Hope this helps
Use the half-reaction method to balance the following equation which is in an acidic
solution:
ClO3-(aq) + I- (aq)
+I2 (s) + Cl- (aq)
Answer:
ClO₃⁻ + 6I⁻ + 6H⁺ ⟶ Cl⁻ + 3I₂ + 3H₂O
Explanation:
Step 1. Write the skeleton equation
ClO₃⁻ + I⁻ ⟶ I₂ + Cl⁻
Step 2. Separate into two half-reactions.
ClO₃⁻ ⟶ Cl⁻
I⁻ ⟶ I₂
Step 3. Balance all atoms other than H and O
ClO₃⁻ ⟶ Cl⁻
2I⁻ ⟶ I₂
Step 4. Balance O by adding H₂O molecules to the deficient side.
ClO₃⁻ ⟶ Cl⁻ + 3H₂O
2I⁻ ⟶ I₂
Step 5. Balance H by adding H⁺ ions to the deficient side.
ClO₃⁻ + 6H⁺ ⟶ Cl⁻ + 3H₂O
2I⁻ ⟶ I₂
Step 6. Balance charge by adding electrons to the deficient side.
ClO₃⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3H₂O
2I⁻ ⟶ I₂ + 2e⁻
Step 7. Multiply each half-reaction by a number to equalize the electrons transferred.
1 × [ClO₃⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3H₂O]
3 × [ 2I⁻ ⟶ I₂ + 2e⁻]
Step 8. Add the two half-reactions.
ClO₃⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3H₂O
6I⁻ ⟶ 3I₂ + 6e⁻
ClO₃⁻ + 6I⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3I₂ + 3H₂O + 6e⁻
Step 9. Cancel species that occur on each side of the equation
ClO₃⁻ + 6I⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3I₂ + 3H₂O + 6e⁻
becomes
ClO₃⁻ + 6I⁻ + 6H⁺ ⟶ Cl⁻ + 3I₂ + 3H₂O
Step 10. Check that all atoms are balanced.
[tex]\begin{array}{ccc}\textbf{Atom} & \textbf{On the left} & \textbf{On the right}\\\text{Cl} & 1 & 1\\\text{O} & 3 & 3\\\text{I} & 6 & 6\\\text{H} & 6 & 6\\\end{array}[/tex]
Step 11. Check that charge is balanced
[tex]\begin{array}{rl}\textbf{On the left} & \textbf{On the right}\\6+ + \; 7- = & 1-\\1- =& 1-\\\end{array}[/tex]
Everything checks. The balanced equation is
ClO₃⁻ + 6I⁻ + 6H⁺ ⟶ Cl⁻ + 3I₂ + 3H₂O
The balanced equation is: ClO₃⁻(aq) + 5I⁻ (aq) + 6H⁺ → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)
To balance the given equation using the half-reaction method in an acidic solution, we need to balance each half-reaction separately and then combine them.
Step 1: Balance the atoms other than hydrogen and oxygen.
The given equation already has the same number of iodine and chlorine atoms on both sides.
Step 2: Balance the oxygen atoms by adding water molecules.
ClO₃⁻(aq) + I⁻ (aq) → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)
Step 3: Balance the hydrogen atoms by adding hydrogen ions (H⁺).
6H⁺ + ClO₃⁻(aq) + I⁻ (aq) → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)
Step 4: Balance the charges by adding electrons (e⁻).
6H⁺ + ClO₃⁻(aq) + 5I⁻ (aq) → I₂ (s) + Cl⁻ (aq) + 3H₂O(l) + 6e⁻
Step 5: Combine the half-reactions to get the balanced equation.
Since the number of electrons lost and gained are equal, we can combine the half-reactions to get the balanced equation:
ClO₃⁻(aq) + 5I⁻ (aq) + 6H⁺ → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)
Therefore, the balanced equation is:
ClO₃⁻(aq) + 5I⁻ (aq) + 6H⁺ → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)