Calculate the amount (mL) of Compound A needed to give 12 mmol. MW of Compound A: 32.04 g/mol Density of Compound A: 0.79 g/mL [x1] mL of Compound A equals 12 mmol (HINT: remember significant digits)
Answers
we need 487.09 mL of Compound A to obtain 12 mmol,
Determine the mass of 12 mmol of Compound A using its molecular weight:
mass = 12 mmol x 32.04 g/mol = 384.48 g
Use the density of Compound A to convert the mass to volume:
volume = mass / density = 384.48 g / 0.79 g/mL = 487.09 mL
A compound refers to a substance that is composed of two or more different elements chemically bonded together. The atoms of these elements are held together by chemical bonds such as covalent or ionic bonds, forming a distinct and unique chemical entity. Compounds have properties that are different from the elements they are composed of, and their properties are determined by the types of atoms present, the arrangement of atoms, and the strength and type of bonds between the atoms.
For example, water is a compound made up of two hydrogen atoms and one oxygen atom, bonded together by covalent bonds. The properties of water, such as its boiling and freezing points, its density, and its ability to dissolve other substances, are unique to water and are a result of its chemical composition and structure.
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Related Questions
Which property Is generally characteristic of an organic compound? (1) low melting point, (2) high melting point, (3) soluble In polar solvents, (4) Insoluble In nonpolar solvents.
Answers
General characteristic of an organic compound is low melting point. So, option (1) is correct.
What are organic compound?Organic compound are any of a large class of compounds in which one or more carbon atoms are covalently bonded to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen. The only carbon-containing compounds not known to be organic include carbides, carbonates, and cyanides. Organic compounds are important because all living things contain carbon. They are the basic building blocks of many cycles that power the earth. For example, there is the carbon cycle, where carbon is exchanged between plants and animals during photosynthesis and cellular respiration.
Organic molecules have lower melting and boiling points because the attractive forces between molecules are weaker, so it does not require much energy to break them apart.
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What is the product of the reaction of 1-propanol with phenyl isocyanate, C6H5N=C=O?
Answers
The balanced equation for this reaction is:
CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O
The reaction of 1-propanol (CH3CH2CH2OH) with phenyl isocyanate (C6H5N=C=O) leads to the formation of a urethane compound. The reaction's balanced equation is as follows:CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O
In this process, the condensation reaction between the isocyanate group (-N=C=O) of phenyl isocyanate and the hydroxyl group (-OH) of 1-propanol results in the creation of a urethane molecule. A propanol group is connected to a phenyl group through an oxygen atom to produce CH3CH2CH2OC(=O)N(C6H5)CH3, the reaction's end product. The reaction also results in the production of water (H2O).Learn more about the condensation reaction:
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Please Help
1. Convert 1.65 moles of magnesium chloride to grams
2. how many moles are in 100 grams of methane (CH4)
Answers
Answer:
157 grams magnesium chloride
Explanation:
1. We must first find the molar mass (g/mole) of magnesium chloride. The molecular formula is MgCl2.
Add the elemental atromic weights for one molecule of the material:
1 Mg = 24.3
2 Cl = 2*(35.45) = 70.9
Total = 95.2 grams/mole
We can use this as a conversion factor by multiplying it times the moles we are asked to convert: (1.65 moles MgCl2)*(95.2 grams/mole MgCl2).
The moles cancel, leaving us with 157 grams of magnesium chloride.
which of the following statements about the diels-alder reaction are true? true it is a reaction involving pi-electrons. false it is a reaction favored by entropy considerations. false it is a concerted reaction. false it is a [1 3] cycloaddition. false it is a thermal reaction
Answers
The statements about diels alder reaction which are true are given in the explanation part.
The following statements about the Diels-Alder reaction are true:
- True: It is a reaction involving pi-electrons.
- True: It is a concerted reaction, meaning that it occurs in a single step without the formation of reaction intermediates.
- False: It is not necessarily favored by entropy considerations, as the reaction can be endothermic and enthalpy-driven.
- True: It is a [4+2] cycloaddition, meaning that it involves the formation of a 6-membered ring from a 4-carbon diene and a 2-carbon dienophile.
- False: While some Diels-Alder reactions can be thermal, others require specific conditions such as high pressure or the use of a catalyst to occur.
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A tank initially holds 200 gal of brine solution containing 3lb of salt. At t=0, another brine solution containing 3lb of salt per gallon is poured into the tank at the rate of 6gal/min, while the well stirred mixture leaves the tank at the same rate. Find the time at which the mixture in the tank contains 6lb of salt. 0.216min 0.168min 2.13min 0.02min
Answers
The tank contains 200 gallons of brine solution with 3 lb of salt. At t = 0, another solution is poured at 6 gal/min, leaving the tank at the same rate. The incoming rate of salt is 18 lb/gal, and the outgoing rate is 6 gal/min. The solution's volume remains constant.
Given that,Initially, the tank holds 200 gallons of brine solution containing 3 lb of salt.At t = 0, another brine solution containing 3 lb of salt per gallon is poured into the tank at the rate of 6 gal/min.The mixture leaves the tank at the same rate.The volume of the tank remains constant.
Now, let's assume that x(t) be the amount of salt in the tank at time t.Therefore,x(0) = 3 lb.
Now, let's find the differential equation that x(t) follows.
In the tank, the incoming rate of salt = 3 lb/gal x 6 gal/min = 18 lb/min.The outgoing rate is 6 gal/min.
The volume of the tank is constant, and it is equal to 200 gallons.∴ (d/dt)x(t) = (18 - 6x(t)/200) lb/min = (9 - 3x(t)/100) lb/min (On dividing by 2)Separating the variables and integrating, we get:
∫(1/9 - x/300) dx = ∫dt Let u = x/300,
then du = (dx/300)Hence,
∫(1/9 - x/300) dx = ∫\(dt(u/2 - u^2/2)\) = t + C [Where C is the constant of integration]
x/600 - x^2/600 = t + C
Now, we need to find the value of C.
\(C = x(0)/600 - x(0)^2/600C\)
3/600 - 9/360000C = -1/2000
Hence,
\(x/600 - x^2/600 = t - 1/2000\)
Multiplying by 600 on both sides, we get,
\(x - x^2 = 600t - 0.3\)...(1)
Now, we need to find the value of t at which the mixture in the tank contains 6 lb of salt.Substituting x = 6 in equation (1), we get:6 - 6^2 = 600t - 0.3...5 = 600t...t = 5/600 = 0.00833 hours = 0.5 minutes
Therefore, the time at which the mixture in the tank contains 6 lb of salt is 0.5 minutes (approximately).Hence, the correct option is 0.02 min.
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What is evaporation ?In what way it is different from boiling? What is the effect
of humidity on the rate of evaporation?
Define Latent heat of fusion? Why does steam cause more severe burning as
compared to boiling water at 1000C ?
Answers
Evaporation is the process by which a liquid converts into a gas or vapor at a temperature below its boiling point. Latent heat of fusion is the amount of heat required to convert a solid into a liquid without any change in temperature. Steam causes more severe burning as compared to boiling water at 100°C due to the large amount of latent heat of vaporization.
On the other hand, boiling is the process by which a liquid turns into a gas or vapor at a temperature equal to or above its boiling point. In other words, when the liquid is heated to a temperature equal to or greater than its boiling point, it turns into a gas or vapor. The effect of humidity on the rate of evaporation is that if the air around the liquid is already humid, then the rate of evaporation will be slower because the air is already saturated with water molecules.
Latent heat of fusion is the amount of heat required to convert a solid into a liquid without any change in temperature. In other words, it is the amount of heat required to break the intermolecular forces between the molecules of a solid to convert it into a liquid.
Steam causes more severe burning as compared to boiling water at 100°C because steam contains a large amount of latent heat of vaporization. When steam comes in contact with the skin, it releases a large amount of latent heat of vaporization, which causes more severe burns as compared to boiling water at 100°C.
Evaporation is the process of turning a liquid into a gas or vapor at a temperature below its boiling point. Boiling, on the other hand, is the process of turning a liquid into a gas or vapor at a temperature equal to or above its boiling point. Humidity affects the rate of evaporation. Latent heat of fusion is the amount of heat required to convert a solid into a liquid. Steam causes more severe burning as compared to boiling water at 100°C due to the large amount of latent heat of vaporization.
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any push or pull is called
Answers
Answer:
A Force.
Explanation:
A force is a push or pull upon an object resulting from the object's interaction with another object. ... Forces only exist as a result of an interaction.
How do you prepare 300 ml buffer of 100 mm tris ph 7. 8 and 250 mm nacl?
Answers
A buffer of 300 ml of 100 mM Tris pH 7.8 and 250 mM NaCl can be prepared by dissolving 3.64 g of Tris and 4.27 g of NaCl in 300 ml of water, and adjusting the pH to 7.8 using 10 ml of 1 M HCl. The % v/v refers to the volume of the solute while % w/v refers to the weight of the solute.
To prepare a 300 ml buffer of 100 mM Tris pH 7.8 and 250 mM NaCl, you need to follow the following steps:1. Calculate the amount of Tris required to prepare 100 mM solution of Tris, which is equal to 100 mM x 0.3 L = 0.03 moles. The molecular weight of Tris is 121.14 g/mol. Thus, the amount of Tris required is 3.64 g.2. To make the buffer of pH 7.8, use HCl or NaOH to adjust the pH. For this, use 1 M HCl or 1 M NaOH to avoid diluting the buffer. Add 10 ml of 1 M HCl to the solution.3. Measure 4.27 g of NaCl and add it to the solution. 4. Add water to the solution to make up the final volume of 300 ml. 5. Mix the solution thoroughly until everything is dissolved. Your buffer of 100 mM Tris pH 7.8 and 250 mM NaCl is now ready. % v/v refers to the percentage volume of a solute in a solvent while % w/v refers to the percentage weight of a solute in a solvent. The percent v/v is calculated by the volume of the solute divided by the volume of the solution while the percent w/v is calculated by the mass of the solute divided by the volume of the solution in which it is dissolved.For more questions on buffer
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The correct question would be as
How do you prepare 300 ml buffer of 100 mM Tris pH 7.8 and 250 mM NaCl? % v/v,% w/v Questions.
what’s the empirical formula of taurine
Answers
Answer: The formula is C2H7NO3S or NH2CH2CH2SO3H
Hope this helps!
How many moles are in 120.g of ar?
Answers
Answer:
3 moles of Argon
Explanation:
The molar mass for argon is 39.948 g/mol
\(\frac{120g}{39.948g/mol} = 3.004molesAr\)
Length of a year. 31,560,000.0 seconds = 3.156 X 10^7 seconds
How do I convert into scientific notation
Answers
Answer: 3.156 * 10^7
Explanation: I do not really understand your question. You answered it yourself!
Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.
You did everything correctly :) Good job!
Phospholipid molecules that prevent the alveoli from collapsing are known as ______. A) laryngitis. B) surfactant. C) mucus. D) plasma.
Answers
B) Surfactant is a phospholipid molecule that prevents alveoli from collapsing. It reduces surface tension in the lungs, allowing the alveoli to remain open and facilitating efficient breathing.
Phospholipid molecules that prevent the alveoli from collapsing are known as surfactants. Surfactant is a substance composed of phospholipids, proteins, and other components. It is produced by specialized cells in the lungs called type II alveolar cells.
The primary function of surfactant is to reduce the surface tension within the alveoli, which are tiny air sacs in the lungs where gas exchange takes place. Without surfactant, the surface tension would be too high, causing the alveoli to collapse during exhalation. Surfactant molecules disrupt the cohesive forces between water molecules on the alveolar surface, allowing the alveoli to remain open and preventing them from sticking together. The presence of surfactant is crucial for efficient breathing and maintaining lung function. In conditions where surfactant production is reduced or absent, such as in premature infants or certain lung diseases, respiratory distress syndrome and other breathing difficulties can occur.
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which part of a food chain absorbs the Sun's light and heat
Answers
The plants are the part that absorb the Sun's light and heat.
The part of a food chain that absorbs the sun's light and heat is producers that are plants.
What is a food chain?A food chain is the chain that shows the transfer of energy from one part to another.
The bottom of the food chain is the producers that make their own food, then the consumers and the decomposers.
Thus, the part of a food chain that absorbs the sun's light and heat is producers that are plants.
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why is true about electron dot diagrams
Answers
Answer: The correct answer is the option: B. An element with eight valence electrons is chemically unstable.
Explanation:
Hello! Let's solve this!
We will analyze each of the options:
A. The group number of the element provides a clue to the number of valence electrons: it is correct, since it provides the number of valence electrons.
B. An element with eight valence electrons is chemically unstable: this is not correct, since elements with eight electrons in the valence shell cannot react because they already have the last complete shell. Therefore, they are chemically stable.
C. The points must be placed one at a time on each side of the chemical symbol: it is correct, because that is the way to make the point diagram.
D. An atom is chemically stable if all the points are paired: this is correct since this verifies that the point diagram has been done well.
We conclude that the correct answer is the option: B. An element with eight valence electrons is chemically unstable.
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When taking ph measurements of solutions, why is it important to stir thoroughly after adding each reagent?.
Answers
3. During your investigation, you perform an experiment, you place 2.0 kg of water at 25.0°C in a calorimeter, heat your 3.0 kg pan to 300.0 °C, you place your pan in the calorimeter. You find the final temperature of the pan and water to be 63.2°C. Calculate the specific heat capacity of the pan. Hint: you first need to calculate the heat absorbed by the water. The specific heat capacity of the water is 4.18 kJ/kg ·°C
Answers
The specific heat capacity of the pan in the calorimeter During your investigation, you perform an experiment, you place 2.0 kg of water at 25.0°C in a calorimeter, heat your 3.0 kg pan to 300.0 °C is 0.449 kJ/kg°C.
How to calculate specific heat capacity?We must first figure out how much heat the water has absorbed. The heat released by the pan must then be determined using the energy conservation concept.
Utilizing the formula:
Q = m * c * ΔT
There are:
(Mass of water) m = 2.0 kg
Water has a specific heat capacity of 4.18 kJ/kg°C.
ΔT = (63.2°C - 25.0°C) = 38.2°C
Q=2.0 kg*4.18 kJ/kg°C*38.2°C = 319.22 kJ
The heat released by the pan must then be determined using the energy conservation concept. It is safe to presume that the water and the calorimeter have absorbed all of the heat that the pan has released. Q is a formula that can be used.
Q = m * c * ΔT
There are:
m = 3.0 kg (the pan's mass).
In terms of the pan's specific heat capacity, c =?
ΔT = (300.0°C - 63.2°C) = 236.8°C
Q = 319.22 kJ
Inputting the values results in:
319.22 kJ = (3.0 kg) * c * (236.8°C)
To solve for c, we obtain:
3.0 kg times 236.8°C times 319.22 kJ equals 0.449 kJ/kg°C.
In this instance, the pan is most likely composed of cast iron.
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Select the correct answer.
0.22 M
HCI
Unknown
LiOH
What is the concentration of the base (LIOH) in this titration?
1.0 ml
0.5 ml
Initial
burette
reading
Final
burette
reading
13.3 ml
18.5 ml
OA
0.16 M
ОВ.
0.15 M
OC. 0.22 M
OD
18 M
O E
0.5 M
Daset
Answers
Answer:
=0.15M
Explanation:
To get the moles of the unknown LiOH, calculate the number of moles of HCl in 12.3mL.
Using the stoichiometric coefficient, mole ratio 1:1.
This means that the number of moles is the same. This number of moles is contained in 18mL. Then Calculate the molarity (concentration) which is in 1000mL
See the explanation from the image I have shared with you for calculations.
What is the molarity of a NaOH solution if 32.47 mL is required to titrate 0.6013 g of potassium hydrogen phthalate (C8H5O4K)
Answers
Answer:
0.0907 M
Explanation:
Before you can calculate the molarity, you need to convert grams to moles (via molar mass) and convert mL to L.
(Step 1)
Molar Mass (C₈H₅O₄K):
8(12.011 g/mol) + 5(1.008 g/mol) + 4(15.998 g/mol) + 39.098 g/mol
Molar Mass (C₈H₅O₄K): 204.218 g/mol
0.6013 g C₈H₅O₄K 1 mole
------------------------------ x ------------------ = 0.00294 moles C₈H₅O₄K
204.218 g
(Step 2)
1,000 mL = 1 L
32.47 mL 1 L
--------------- x ----------------- = 0.03247 L
1,000 mL
(Step 3)
Molarity (M) = moles / volume (L)
Molarity = 0.00294 moles / 0.03247 L
Molarity = 0.0907 M
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Hi, I really need help, my mental health is horrible right now and I can’t do any work, and I really just need help answering these questions because I really don’t want to get bad marks but I don’t have the motivation to do anything, thanks so much!
Answers
Why is it dangerous to heat a liquid in a distilling apparatus that is closed tightly at every joint and has no vent to the atmosphere?
Answers
Heating a liquid in a distilling apparatus that is closed tightly at every joint and has no vent to the atmosphere can be dangerous due to the build-up of pressure inside the apparatus.
As the liquid is heated, it will begin to evaporate and turn into a gas, increasing the pressure inside the apparatus. Without a vent to the atmosphere, this pressure has nowhere to escape and will continue to build up until it reaches dangerous levels.
If the pressure becomes too great, it can cause the apparatus to rupture, leading to an explosion and potentially causing harm to anyone nearby. Additionally, if the liquid being heated is flammable or toxic, the consequences of an explosion can be even more severe.
To prevent this dangerous situation from occurring, it is important to ensure that distilling apparatuses have a vent to the atmosphere to allow any pressure to escape. This will help to keep everyone safe and prevent any accidents from occurring.
In conclusion, heating a liquid in a distilling apparatus that is closed tightly at every joint and has no vent to the atmosphere can be very dangerous due to the build-up of pressure inside the apparatus. Therefore, it is important to ensure that distilling apparatuses have a vent to the atmosphere to prevent any accidents from occurring.
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Which of the following sources should be examined in a study to determine the impact of a geologic source on levels of CO2 in the atmosphere?
answer choices
Photosynthesis
cellular respiration
decomposition
volcanoes
Answers
The sοurces which shοuld be examined in a study tο determine the impact οf a geοlοgic sοurce οn levels οf CO₂ in the atmοsphere, accοrding tο the given οptiοns are Vοlcanοes.
What are geοlοgical sοurces?Geοlοgic sοurces refer tο natural prοcesses and events related tο the Earth's geοlοgical activities. These sοurces include vοlcanic eruptiοns, geοthermal activity, release οf gases frοm undergrοund reservοirs, and geοlοgical fοrmatiοns that cοntain οr release certain substances. These sοurces can cοntribute tο the release οf variοus gases, including carbοn diοxide (CO₂), intο the atmοsphere.
Therefοre, The sοurces which shοuld be examined in a study tο determine the impact οf a geοlοgic sοurce οn levels οf CO₂ in the atmοsphere are Vοlcanοes.
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each atom of an element has the following electron configuration.
1s22s22p63s23p64s23d104p65s24d105p5
what is the name of this element
Answers
Answer:
12 angle
Explanation:
in an ecosystem, which of the following is a trait of living organisms?
question 1 options:
A) contains DNA
B) can reproduce made of cells with membrane bound nucleus
C) All of the above
Answers
Answer:
All of the above
Explanation:
I chose Option C because a living organism contains DNA and it can reproduce made of cells with membrane bound nucleus.
Heat transfer is the movement of heat from a hotter object to a cooler object. true or false
Answers
Answer: The given statement is True.
Explanation:
The heat will move from hotter object to the cooler object in search of thermal equilibrium. Heat transfer will only stop when both the bodies are at the same temperature.
Heat transfer can be done using conduction , convection or radiation.
The statement that Heat transfer is the movement of heat from a hotter object to a cooler object is True.
What information cannot be identified if the number of protons for a neutral atom is known? atomic number identity of the element number of electrons number of neutrons
Answers
If the number of protons for a neutral atom is known, the atomic number and the identity of the element can be determined. The atomic number corresponds to the number of protons in an atom, and each element has a unique atomic number.
However, the number of electrons and the number of neutrons cannot be directly identified solely based on the number of protons.
The number of electrons in a neutral atom is equal to the number of protons, as the atom overall carries no net charge. For example, if an atom has 6 protons (atomic number of 6), it will also have 6 electrons to maintain neutrality.
On the other hand, the number of neutrons in an atom can vary, even within the same element. Different isotopes of an element have the same number of protons but different numbers of neutrons. The total mass of an atom, which includes protons and neutrons, is determined by the atomic mass number. However, knowing only the number of protons does not provide information about the specific isotope or the number of neutrons.
To determine the number of neutrons or the specific isotope of an element, additional information such as the mass number or isotopic composition is needed.
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When equal volumes of the following pairs of solutions are mixed, which will result in a buffer solution?
1. 0.1 M HF and 0.1 M HCl
2. 0.1 M HF and 0.2 M NaOH
3. 0.2 M NaF and 0.1 M HCl
4. 0.1 M NaF and 0.1 M NaOH
A.
4 only
B.
1 only
C.
2 only
D.
3 only
E. none
Answers
The pair of solutions which will result in a buffer solution is D. 3 only (0.2 M NaF and 0.1 M HCl)
How to determine which mixture will result in a buffer solution?
To determine which mixture will result in a buffer solution, we must look for a mixture that contains a weak acid and its conjugate base, or a weak base and its conjugate acid. A buffer solution helps maintain a relatively constant pH when small amounts of acid or base are added.
Let's check our options which will result in a buffer solution after mixing in equal proportions:
1. 0.1 M HF and 0.1 M HCl - Both are acids, and HCl is a strong acid, so no buffer solution is formed.
2. 0.1 M HF and 0.2 M NaOH - HF is a weak acid and NaOH is a strong base. Upon mixing, the NaOH will neutralize the HF. Since there will be excess NaOH so it dominates the reaction and no buffer will form.
3. 0.2 M NaF and 0.1 M HCl - NaF is the conjugate base of HF (a weak acid) and HCl is a strong acid. The HCl will neutralize some of the F-, forming HF, but not all, resulting in a mixture of HF and F-, which is a buffer solution.
4. 0.1 M NaF and 0.1 M NaOH - NaF is a conjugate base and NaOH is a strong base, so no buffer solution is formed.
Therefore the correct option will be: D. 3 only (0.2 M NaF and 0.1 M HCl will result in a buffer solution).
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according to the Aufbau principle, which principle energy level would have higher energy, n=2 or n=5?
Answers
Answer:b
Explanation:
the structure of the nacl crystal forms reflecting planes 0.541 nm apart. what is the smallest angle, measured from these planes, at which constructive interference of an x-ray beam reflecting off the two planes is observed? assume x-rays of wavelength 0.0649 nm are used? give your answer in degrees.
Answers
The smallest angle, measured from the reflecting planes, at which constructive interference of an X-ray beam is observed is approximately 27.2 degrees.
To determine the smallest angle of constructive interference, we can use Bragg's Law, which states that constructive interference occurs when the path difference between two waves is equal to an integer multiple of the wavelength. The formula is given as:
2d sin(θ) = nλ
Where:
d is the distance between the reflecting planes (0.541 nm)
θ is the angle between the incident X-ray beam and the planes (the desired angle)
n is the order of the interference (we are considering the first-order, so n = 1)
λ is the wavelength of the X-ray beam (0.0649 nm)
Rearranging the formula, we get:
sin(θ) = (nλ) / (2d)
θ = arcsin((nλ) / (2d))
Plugging in the values, we have:
θ = arcsin((1 * 0.0649 nm) / (2 * 0.541 nm))
θ ≈ 27.2 degrees
Therefore, the smallest angle at which constructive interference is observed is approximately 27.2 degrees.
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Match up the characteristics below with the type of molecular bond they describe. Bonds found in Halite (between Na+ and Cl-) Bonds found between Si and O in the Si-O tetrahedron Bonds inside the water molecule (between the H and O ) Bonds that exist between two water molecules Strongest bond type Weakest bond type Bonds that are used by water to dissolve sal
Answers
The characteristics and the type of molecular bond they describe:
1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond
2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond
3. Bonds inside the water molecule (between the H and O): Covalent bond
4. Bonds that exist between two water molecules: Hydrogen bond
5. Strongest bond type: Covalent bond
6. Weakest bond type: Van der Waals bond
7. Bonds that are used by water to dissolve salt: Ionic bond
The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.
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plz help!
Why is it important that scientists use identical twins, rather than fraternal twins or siblings in studying how the environment affects gene expression?