Answer:
- 90.6 kJ/mol.
Explanation:
The enthalpy change of the reaction (ΔHrxn) is the difference between the sum of heat of formation of products and reactants.ΔHrxn = ∑ΔHf(products) - ∑ΔHf(reactants)
For the reaction: 2KClO₃ → 2KCl + 3O₂,
∴ ΔHrxn = ∑ΔHf(products) - ∑ΔHf(reactants)
∴ ΔHrxn = [(2*ΔHf(KCl)) + (3*ΔHf(O₂))] - [(2*ΔHf(KClO₃))] = [(2*(- 436.7 kJ/mol)) + (3*(0)] - [(2*(- 391.4 kJ/mol)] = [- 873.4 kJ/mol] - [- 782.8 kJ/mol] = - 90.6 kJ/mol.
The enthalpy change of the reaction 2KClO3 -> 2KCl + 3O2 is calculated by subtracting the sum of the enthalpies of the reactants from the sum of the enthalpies of the products. The calculation results in an enthalpy change of 90.6 kJ, meaning the reaction is endothermic.
Explanation:The enthalpy change of the reaction can be calculated by subtracting the sum of the enthalpies of the reactants from the sum of the enthalpies of the products. This is also known as Hess's law.
In this reaction, the reactants are 2 moles of KClO3 and the products are 2 moles of KCl and 3 moles of O2. Hence, the enthalpy of the reaction can be calculated as follows:
Enthalpy change = [2 * (-391.4 kJ/mol)] - [2 * (-436.7 kJ/mol) + 3 * 0 kJ/mol]
= (-782.8 kJ) - (-873.4 kJ)
= 90.6 kJ
Therefore, the enthalpy change of this reaction is 90.6 kJ. If the enthalpy change is positive, the reaction is endothermic meaning it absorbs heat from the surroundings.
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at 450 mm Hg a gas has a volume of 760 L, what is its volume at standard pressure
Answer:
450.0 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have different values of P and V:(P₁V₁) = (P₂V₂).
V₁ = 760.0 L, P₁ = 450.0 mm Hg,
V₂ = ??? L, P₂ = 760.0 mm Hg (standard pressure = 1.0 atm = 760 mm Hg).
∴ V₂ = (P₁V₁)/(P₂) = (760.0 L)(450.0 mm Hg)/(760.0 mm Hg) = 450.0 L.
Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. Potassium (K): 1s22s22p63s23p64s1
Answer:
The number of core electrons = 18 electrons.
The number of valence electrons = 1 electron.
Explanation:
The core electrons are the electrons in the inner shells (1s²2s²2p⁶3s²3p⁶).∴ the number of core electrons = 18 electrons.
The valence electrons are the electrons in the outermost shell (4s¹).
∴ the number of valence electrons = 1 electron.
Answer:
18 core electrons
1 valence electron
Explanation:
In the periodic table, potassium stands at the head or beginning of the fourth period. It is found in group 1. The third period ends with argon having 18 electrons. This implies that potassium should have at least 18 core electrons. Since it is found in group 1 having only 1 valence electron, it is expected to also have one valence electron.
Its electron configuration summarizes these statements above; 1s22s22p63s23p64s1
There are 18 core electrons and one valence electron in the outermost 4s1 orbital (the fourth shell)
When ions having a positive charge form bonds with ions having a negative charge, the charge on the resulting compound is negative.
Answer:
See below.
Explanation:
No, the resulting charge will be 0.
For example Na+ + Cl- ---> NaCl.
The sodium chloride formed is neutral ( NO CHARGE).
Contrary to the original assertion, the charge on an ionic compound is not negative but rather neutral, as the total positive charges of the cations balance the total negative charges of the anions. Ionic compounds are formed when cations and anions bond due to electrostatic attraction, resulting in a neutral compound.
When ions with a positive charge, known as cations, form bonds with ions with a negative charge, known as anions, the result is an ionic compound. Contrary to the statement in the question, the overall charge on the resulting ionic compound is not negative. Instead, ionic compounds are electrically neutral because the total number of positive charges and negative charges balance each other out.
Ions form when atoms gain or lose electrons. A cation is formed by the loss of electrons and maintains a positive charge, while an anion is created by the gain of electrons and carries a negative charge. The ionic formula represents a balance of the total positive and negative charges so that the compound is electrically neutral.
For example, in sodium chloride (NaCl), sodium (Na+) is the cation with a +1 charge and chloride (Cl-) is the anion with a -1 charge. The charges balance out (+1-1=0), and the resulting compound is neutral. Similarly, in magnesium oxide (MgO), magnesium has a +2 charge and oxygen has a -2 charge, which also balance out to give a neutral compound.
The electrostatic attraction between these oppositely charged ions forms what is known as an ionic bond. Ionic bonds are strong and result in the formation of a structured ionic lattice or network. This attraction is explained by the principle that opposite charges attract, a fundamental concept in electrostatics.
Fill in the coefficients that will balance the following reaction:
a0Cr2(SO4)3 + a1AgNO3 -> a2Cr(NO3)3 + a3Ag2SO4
Answer
Explanation:
can you please put it in boxes so i can find out the answer
Answer:
a0=1
a1=6
a2=2
a3=3
Explanation:
We have to start with the reaction:
[tex]Cr_2(SO_4)_3~+~AgNO_3~->~Cr(NO_3)_3~+~Ag_2SO_4[/tex]
We have to start with "[tex]Cr[/tex]". If we want to balance Cr we have to obtain 2 on both sides. Therefore we have to add a "2" on the right side, so:
[tex]Cr_2(SO_4)_3~+~AgNO_3~->~2Cr(NO_3)_3~+~Ag_2SO_4[/tex]
Then we can balance "[tex]NO_3[/tex]" as a whole. We have 6 on the right, we have to have the same amount on the left side, so:
[tex]Cr_2(SO_4)_3~+~6AgNO_3~->~2Cr(NO_3)_3~+~Ag_2SO_4[/tex]
Then we can balance "[tex]Ag[/tex]". We have 6 on the left, so we have to have the same amount on the right if we already have 2 we have to put a · in front (on the right side) to obtain in total 6, so:
[tex]Cr_2(SO_4)_3~+~6AgNO_3~->~2Cr(NO_3)_3~+~3Ag_2SO_4[/tex]
Finally, when we add this last number the [tex]SO_4[/tex] we will have 3 on both sides. Therefore the reaction is already balanced.
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Professor Bothwell determined from the wrapper the number of calories in a candy bar. He then burned the entire candy bar and measured the amount of heat released. His experiment was most likely designed to demonstrate _________.
A the law of conservation of matter
B the law of disorder
C the law of conservation of energy
D the law of constant composition
His experiment was most likely designed to demonstrate the law of conservation of energy, which states that energy the total energy of an isolated system remains constant; it is said to be conserved over time. This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another. So, he was trying to demonstrate that the amount of heat energy released was equal to the number of calories (amount of energy) stated to be in the candy bar.
13. A covalent bond between two atoms is likely to be polar if:
a. One of the atoms is much more electronegative than the other.
b. The two atoms are equally electronegative.
c. The two atoms are of the same element.
d. The bond is part of a tetrahedrally shaped molecule.
e. One atom is an anion.
A covalent bond between two atoms is likely to be polar if one atom is more electronegative than the other. This happens because the more electronegative atom pulls the shared electrons closer to itself, resulting in a polar covalent bond.
Explanation:A covalent bond between two atoms is likely to be polar if one of the atoms is much more electronegative than the other. A covalent bond is formed when two atoms share electrons. However, when one atom is significantly more electronegative, it pulls the shared electrons closer to itself, creating a partial negative charge. The other atom then has a partial positive charge, creating a polar covalent bond.
For example, in a water molecule (H2O), the oxygen atom is more electronegative than the hydrogen atoms, resulting in a polar covalent bond. The other options given (b, c, d, e) are either special conditions of a covalent bond or not related to the polarity of a bond at all.
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Which shows the correct order of steps during the formation of an ionic bond?
a) lons are attracted to each other - Electrons are transferred -- An ionic compound forms
b) An ionic compound forms – lons are attracted to each other Electrons are transferred
c) Electrons are transferred – lons form lons are attracted to each other
d) lons form – Electrons are transferred - lons are attracted to each other
Answer: c.
Electrons are transferred → Ions form → Ions are attracted to each other
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Explanation:
Answer:
Electrons are transferred – lons form lons are attracted to each other
Explanation:
Let us use the formation of NaCl as an example. Sodium ion forms by transferring one electron to chlorine and chloride ions form by accepting this one electron from sodium hence electron transfer must be the first step in ionic bond formation. Once electrons are donated and received, ions are formed which are immediately attracted to each other to form the ionic compound.
How is 0.00235 expressed in proper scientific notation?
A. 2.35 × 10-3
B. 0.235 × 10-2
C. 2.35
D. 2.35 × 103
Answer:
A
Explanation:
it's always a _.___x10^____
You move the decimal three places to the right for this one, so negative 3
Any number less than 0 will have a negative exponent beside the base number 10
The correct option is: A. The number 0.00235 in proper scientific notation is written as 2.35 × 10⁻³ because the decimal moves three places to the right, making the exponent -3.
To express 0.00235 in proper scientific notation, follow these steps:
Move the decimal point so that there is only one non-zero digit to its left. For 0.00235, this would be 2.35.Count the number of places the decimal has moved. Here, it has moved 3 places to the right.Since the decimal moved to the right, the exponent will be negative. The final scientific notation is 2.35 × 10⁻³.Therefore, the correct answer is A. 2.35 × 10⁻³.
The atoms in a ____ have a definite volume, but move quickly enough to overcome the forces of attraction between them.
A. Solid
B.Liquid
C.Gas
Answer:
liquid
Explanation:
The atoms in a liquid have a definite volume, but move quickly enough to overcome the forces of attraction between them.
What is atoms ?The smallest component of ordinary stuff that makes up a chemical element is very much an atom.
What is liquid?A liquid would be an incompressible flow fluid which thus takes on the shape of the container while maintaining an even volume regardless of pressure.
Therefore, the atoms in a liquid have a definite volume, but move quickly enough to overcome the forces of attraction between them.
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In an investigation that uses the scientific method, which step immediately follows making a hypothesis?
O summarizing the results
O asking a question
O making observations
designing an experiment
Mark this and retum
Save and Exit
Next
Submit
Answer:
Designing an experiment
Explanation:
After forming a hypothesis you need to prove it, so you must design an experiment to do so.
Answer:
D) Designing an Experiment
Explanation:
After you write your hypothesis, you would design your experiment.
Summarizing results comes much later, after the experiment is already conducted.
Asking a question comes prior to the hypothesis.
Making observations comes during the experiment.
You must design the experiment before you can make observations or summarize results.
The reactants of two chemical reactions are shown.
Reaction 1: HCl and NaOH
Reaction 2: Cu and AgNO3
Which reaction is likely to be a redox reaction?
A) Reaction 1, because hydrogen and hydroxide atoms will be formed.
B) Reaction 1, because all ions formed will retain their electrostatic charges.
C) Reaction 2, because the electrostatic charge on copper ion will change.
D) Reaction 2, because the charges on each side of the equation will be unequal.
Answer:
C)
Explanation:
The first step is to write the whole reactions:
A)[tex]HCl~+~NaOH~->~H_2O~+~NaCl[/tex]
B)[tex]Cu~+~AgNO_3~->~Cu(NO_3)_2~+~Ag[/tex]
In A) reaction we will have an acid-base reaction (double replacement reaction). In this reaction, the oxidation number is the same for all atoms on both sides of the reaction.
In B) the oxidation number of Cu will change from zero to +2 and the oxidation number of Ag will change from +1 to zero. So, the Cu will be oxidized and the Ag will reduce. So, if we have a redox reaction for B) the charge must be equal on both sides.
Type the correct answer in each box.
Balance the chemical equation.
__ N203 ➡️ __ N2 +__ O2
Final answer:
To balance the chemical equation for N₂O₃ → N₂ + 3O₂, we place a coefficient of 2 in front of N₂O₃ to achieve an even number of oxygen atoms and adjust the coefficient of N₂ accordingly, resulting in the balanced equation 2N₂O₃ → 2N₂ + 3O₂.
Explanation:
To balance the chemical equation N₂O₃ → N₂ + 3O₂, we need to ensure that the number of nitrogen (N) atoms and oxygen (O) atoms on the reactant side is equal to the number on the product side. Initially, we have 2 nitrogen atoms and 3 oxygen atoms on the reactant side. On the product side, we have 2 nitrogen atoms (in N₂) and 2 oxygen atoms (in O₂).
To balance oxygen atoms, we can start by placing a coefficient of 3 in front of O₂ to get 6 oxygen atoms on the product side. Now we have:
N₂O₃ → N₂ + 3O₂However, we now have an uneven number of oxygen atoms since we have 3 molecules of O₂, which means 6 oxygen atoms on the right side, while we have only 3 oxygen atoms on the left side from the N₂O₃ molecule. Since oxygen only exists in diatomic form naturally, we must adjust the number of N₂O₃ molecules to ensure there is an even number of oxygen atoms to form O₂ molecules. Placing a coefficient of 2 in front of N₂O₃, and consequently adjusting the coefficient of N2 to maintain the balance of nitrogen, the balanced equation is:
2N₂O₃ → 2N₂ + 3O₂Which of the following particles has a negative charge?
neutrino
positron
gamma ray
all of the above
none of the above
Answer:
gamma ray
Explanation:
Answer:
None of the above.
Explanation:
We have to find the particle which have negative charge.
1.Neutrino
It has no negative charge.The charge on neutrino particle is zero.Therefore,It is neutral particle.
Hence,option A is false.
2.Positron
It has no negative charge.The charge on the particle is +1 e.Therefore, it is false.
3.Gamma ray
It is a from of electromagnetic radiation.It has charge 0.Therefore, it has no negative charge.
Hence, option 3 is false.
Answer:None of the above.
what does the process of natural selection involve
Answer:
Only the organisms best adapted to their environment tend to survive and transmit their genetic characters in increasing numbers to succeeding generations while those less adapted tend to be eliminated.
Explanation:
According to Darwin's Theory of Evolution.
Hope this helped.
Final answer:
Natural selection is the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce. It acts on the population's heritable traits, selecting for beneficial alleles and against deleterious alleles.
Explanation:
Natural selection is the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce in greater numbers. It acts on the population's heritable traits, selecting for beneficial alleles that increase their frequency and selecting against deleterious alleles. Natural selection is not random, as it favors variants that are better able to survive and reproduce.
What is an example of a physical property?
Answer:
Malleability
Explanation:
How does this equation help you to understand acids and bases: H+(aq) + OH-(aq)
A. It shows you how water is formed
B. It shows you that water can be written as HOH.
C. It shows you that water is a reversible reaction, which contains hydrogen and hydroxide ions.
Please help ASAP!!
Answer:
C. It shows you that the formation of water is a reversible reaction, which contains hydrogen and hydroxide ions.
Explanation:
The equation is
H₂O(ℓ) ⇌ H⁺(aq) + OH⁻(aq)
It also shows that water can behave as either an acid or a base, because it can produce both H⁺ and OH⁻ ions.
A and B are both wrong. Although the statements are correct, they don't say anything about acids and bases.
Explain how cells use digested food in your own words
Answer:
The digestive system uses mechanical and chemical methods to break food down into nutrient molecules that can be absorbed into the blood. ... Some animals use intracellular digestion, where food is taken into cells by phagocytosis with digestive enzymes being secreted into the phagocytic vesicles.
Explanation:
Digestion is crucial for breaking down meals into vitamins, which the frame uses for energy, growth, and cellular repair. food and drink need to be modified into smaller molecules of vitamins before the blood absorbs them and incorporates them into cells all through the frame.
What takes place in the digested meals?The small gut absorbs the maximum of the vitamins in your food, and your circulatory system passes them on to different components of your body to keep or use. Special cells help absorb vitamins across the intestinal lining into your bloodstream.
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how many prime numbers are there between 0 and 75
Answer:
There are 21 prime numbers between 0 and 75.
Explanation:
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73
Answer:
21
Explanation:
There are 21 prime numbers between 0 and 75.
These include:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73.
What would happen to a volleyball left outside in the winter?
O
O
O
O
A. It would expand.
B. It would lose air.
C. It would shrink.
D. It would explode.
Answer:
it would shrink.
Explanation:
it doesnt loose air, but as the air gets colder it hits the sides less. it eventually goes flat
Volleyball left outside in the winter would lose air. The correct option is option B.
When a volleyball is left outside in the winter, the temperature drop can cause the air inside the ball to contract. As a result, the air pressure inside the ball decreases, causing it to lose air. This can lead to a deflated or partially deflated volleyball. It is important to note that extreme temperature changes or freezing temperatures could potentially cause damage to the ball, but the most immediate and likely effect would be the loss of air pressure.
Hence, the volleyball loose air when left outside.
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Which statement best describes the oxidation numbers of the atoms found in magnesium chloride?
A. Magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number.
B. Magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number.
C. Magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number.
D. Magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.
Answer- The correct choice of answer out of all would be option C.
Explanation
The given substance magnesium chloride made out of combination of chlorine and magnesium is a compound. Where magnesium has two positive ions and chlorine has two negative ions which trigger the reaction.
Hence the oxidation of the 2 positive ions of Magnesium takes place and reduction of the Negative Ion chlorine has to offer attract and stabilize each other by forming the compound .
What type of radiation is emitted when polonium-212 forms lead-208?
Answer:
Alpha radiation
Explanation:
Polonium-212 decays to lead-208 by emission of an alpha particle according to the following equation.
²¹²₈₄ Po →²⁰⁸₈₂ Pb +⁴₂ He + Energy.
Te alpha particle is a helium particle. It has 2 protons and 2 neutrons.
_____are charged atoms or groups of atoms. Compounds Ions Molecules Elements
Answer:
Ions
Explanation:
because they contain positive and negative charges
The grouped atoms with charges are called ions.
Explanation:When an atoms losses electron, then it forms positive ion or cation whereas when an atoms losses electron, then it forms negative ion or anion. The attraction between two ions leads to formation of the ionic bond.
There are many types of ions which includes monoatomic ions which contains one atoms and polyatomic ions which contains two or more atoms. When atoms are converted into ions, then the atom is undergoing ionization process.
What does the energy hill represent on an energy diagram?
Answer:
A
Explanation:
2. Which balanced equation represents an oxidation-reduction reaction?
A) H3PO4 + 3KOH →K3PO4 + 3H20
B) NH3(g) + HCl(g) →NH4Cl(s)
C) Fe(s) + S(s) →FeS(s)
D) Ba(NO3)2 + Na2SO4 →BaSO4 + 2NaNO3
Answer:
C) Fe(s) + S(s) →FeS(s)
Explanation:
How many particles would be found in a 1.224 g sample of K2O
Answer:
7.8286×10²¹ particles.
Explanation:
First we need to calculate the total molar mass of the compound, in this case:
Potassium (K) = 39.1 g/mol × 2 = 78.2 +
Oxigen (O) = 16 g/mol × 1 = 16
Total(K₂O) = 94.2 g/mol
Then, we calculate the number of moles of the compound in the sample, this is done dividing de mass of the sample by the molar mass:
[tex]mol =\frac{1.224 g}{94.2 g/mol}[/tex]
mol = 0.013 moles in our sample.
Finally, we calculate the total number of particles. The costant known as Avogadro number (6.022×10²³) is the number of particles or atoms contained in a mole of any substance. We need to multiply the number of moles by the Avogadro number.
particles = 0.013 mol × (6.022×10²³ particles/mol) = 7.8286×10²¹ particles.
The sample contains approximately 7.83 x 10²¹ particles.
To find the number of particles in a 1.224 g sample of K₂O, follow these steps:
1. Calculate the molar mass of K₂O:
Potassium (K) has an atomic mass of 39.10 g/mol. Since there are two potassium atoms in K₂O:2 * 39.10 g/mol = 78.20 g/molOxygen (O) has an atomic mass of 16.00 g/mol.So, the molar mass of K₂O = 78.20 g/mol + 16.00 g/mol = 94.20 g/mol.2. Determine the number of moles of K₂O in 1.224 g:
Moles of K₂O = mass (g) / molar mass (g/mol)Moles of K₂O = 1.224 g / 94.20 g/mol ≈ 0.013 mol3. Calculate the number of particles:
One mole of any substance contains Avogadro's number of particles, which is 6.022 x 10²³.Number of particles = moles * Avogadro's number Number of particles = 0.013 mol * 6.022 x 10²³ ≈ 7.83 x 10²¹ particlesTherefore, a 1.224 g sample of K₂O contains approximately 7.83 x 10²¹ particles.
What is critical mass?
the smallest mass of any material that can stop a chain reaction
the greatest mass of any material that can stop a chain reaction
the smallest mass of material that can sustain a chain reaction
the greatest mass of material that can sustain a chain reaction
Answer:
the smallest mass of material that can sustain a chain reaction
Explanation:
Critical mass refers to the smallest possible mass of a fissionable material that can sustain a chain reaction
Answer:
The answer is C.
Explanation:
Critical mass is the smallest mass of material that can sustain a chain reaction.
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which best explains the effect of chemicals on the environment ?
The correct option is D.
Chemicals can have both beneficial and harmful effects on the environment, depending on their type, use, and context.
The effect of chemicals on the environment is a complex and multifaceted issue, and it cannot be simplified into a single option. Instead, the most accurate explanation is that:
Chemicals can be helpful or harmful to the environment.
Here's a detailed breakdown of this answer:
1. Harmful Effects of Chemicals:
Many chemicals, such as industrial pollutants, pesticides, and certain heavy metals, can have detrimental impacts on the environment. These substances can contaminate air, soil, and water, leading to pollution, ecosystem disruption, and harm to wildlife.Some chemicals can bioaccumulate in organisms, leading to adverse health effects for both wildlife and humans when they enter the food chain.2. Beneficial Effects of Chemicals:
Not all chemicals are harmful to the environment. Some chemicals are essential for various natural processes and are used in agriculture, water treatment, and other industries to improve living conditions.For example, fertilizers and plant nutrients help enhance crop production, and certain chemicals are used in wastewater treatment to purify water before it is released back into the environment.3. Context Matters:
The impact of chemicals on the environment depends on the specific chemical, its concentration, how it's used, and the environmental conditions.Regulatory agencies and environmental scientists work to assess and manage the risks associated with various chemicals to minimize their harmful effects.In conclusion, chemicals can have a range of effects on the environment, and their impact can be both beneficial and harmful. It's essential to consider the specific chemical and its application within a broader environmental context to make informed decisions about their use and regulation.
The complete question is here:
Which best explains the effect of chemicals on the environment?
A. Chemicals are only harmful to the environment.
B. Chemicals do not affect the environment.
C. Chemicals are only helpful to the environment.
D. Chemicals can be helpful or harmful to the environment.
Identify the parts of the energy diagrams.
energy released
energy absorbed
reactants
products
HELP!!!!!!!
Energy release is exothermic reaction whiles energy absorb is endothermic reaction
Explanation:
Exothermic reaction is when the reactant is above the product while endothermic the product is below the reactant in the diagrams we have some part as activation energy
Which of the following elements has the highest electronegativity?
A) Chlorine
B) Florine
C) Hydrogen
D) Carbon
Answer:
B) Florine
Explanation:
Thus, fluorine is the most electronegative element.
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You have 100ml of a 12m solution of HCI, and you need to dilute it to 1.5m for an experiment. How many liters will your new solution be? Show your work
Please answer asap!!!
Answer:
0.8 liters.
Explanation:
By proportion the volume of the new solution will be (12/1.5) * 100 ML
= 800 ml = 0.8 liters.