Answers
Answer:
The solubility of Zn(OH)₂ at 25ºC is 1.96x 10⁻⁶,
Explanation:
The solubility is the maximum amount of a solute that can be dissolved in a certain volume of liquid (usually water) at a given temperature.
First, we write the dissolution reaction of Zn(OH)₂ in water, which is:
Zn(OH)₂ (s) ⇄ Zn²⁺ + 2 OH⁻
We know that the Kps, that is, the dissolution equilibrium constant for this compound at 25ºC is 3.0x 10⁻¹⁷.
Therefore, the Kps is:
Kps= [Zn²⁺][OH⁻]² (since Zn(OH)₂ is solid, it is not accounted for).
Given the reaction, we can see that for every single Zn²⁺ ion, two OH⁻ ions are produced. Therefore, if the concentration of Zn²⁺ dissolved is x M, the concentration of OH⁻ dissolved will be 2x M.
Substituting these values in Kps, we have:
[Zn²⁺][OH⁻]² = (x)(2x)² = 3.0x 10⁻¹⁷
4x³ = 3.0x 10⁻¹⁷
x= ∛ (3.0x 10⁻¹⁷ ÷ 4)
x= 1.96x 10⁻⁶
Therefore, the molar solubility of Zn(OH)₂ at 25ºC will be 1.96x 10⁻⁶.
Related Questions
Johnson, Taniya
A student travels on a trail by bicycle 20 miles in 2 hours. What is the average speed of the student?
Answers
Answer:
i think its 10 miles per hour
A 3.00 L flexible container holds a sample of hydrogen gas at 153 kPa.
The pressure increases to 304 kPaand the temperature remains constant.
What will the volume be?
0.66 L
1.51 L
2.26 L
4.50 L
Answers
The volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L (option B).
How to calculate volume?The volume of a substance can be calculated using the following formula:
P1V1 = P2V2
Where;
P1 = initial pressureP2 = final pressureV1 = initial volumeV2 = final volume153 × 3 = 304 × V2
459 = 304V2
V2 = 459/304
V2 = 1.51L
Therefore, the volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L.
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nitial mass of water, at its boiling point, is 0.8 kg. 4 kW of heater is used to boil it completely. Assuming the specific latent heat of vaporization of water is 2MJ/kg, what is the time taken to vaporize all the water
Answers
The time taken to vaporize all the water is 400 seconds.
Total heat required to vaporize the water
The total heat required to vaporize the water is calculated as follows;
E = Lm
where;
L is latent heat of vaporization of waterm is mass of waterE = 2 x 10⁶ J/kg x 0.8 kg
E = 1,600,000 J
Time taken to vaporize all the waterThe time taken to vaporize all the water is calculated as follows;
E = power x time
time = E/power
time = ( 1,600,000 J) / (4,000 J/s)
time = 400 seconds
Thus, the time taken to vaporize all the water is 400 seconds.
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a gas has an initial volume of 3,480 mL and an initial temperature of - 70.0 C. what must be the temperature of the gas in kelvin if its volume is reduced to 2,450 mL
Answers
The temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.
To determine the temperature of the gas in Kelvin after its volume is reduced, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature for a given amount of gas.
The combined gas law equation is:
(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂
Where P₁ and P₂ are the initial and final pressures, V₁ and V₂ are the initial and final volumes, T₁ is the initial temperature in Kelvin, and T₂ is the final temperature in Kelvin.
Given that the initial volume V₁ is 3,480 mL, the initial temperature T₁ is -70.0 °C (which needs to be converted to Kelvin), and the final volume V₂ is 2,450 mL, we can substitute these values into the equation.
To convert -70.0 °C to Kelvin, we add 273.15 to it, resulting in T₁ = 203.15 K.
Now we can solve for T₂:
(T₂ * V₁) / T₁ = V₂
T₂ = (V₂ * T₁) / V₁ = (2,450 mL * 203.15 K) / 3,480 mL
Simplifying the equation, we find:
T₂ ≈ 143.27 K
Therefore, the temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.
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Derive the van der Waals equation of state for a real gas and explain the significance of the law.
Answers
In the case of a real gas when you're using Van Der Waals equation, the volume of a real gas is considered as (Vm - b), where b can be considered as the volume occupied by per mole.
Therefore, when the ideal gas law gets substituted with V = Vm - b, it is given as : P(Vm - b) = nRT
The presence of intermolecular attraction P was modified as follows.
\(\frac{P+a}{V^{2} } (Vm- b) = RT\\\frac{P+an^{2} }{V^{2} } (V - nb) = nRT\)
Where, Vm: molar volume of the gas
R: universal gas constant
T: temperature
P: pressure
V: volume
Thus, it is possible to reduce Van Der Waals equation to the ideal gas law as PVm = RT.
What is the significance of the Ideal gas Law?
The ideal gas law only functions as an approximation approach when high accuracy is not necessary because it describes the behaviour of ideal gasses, which there aren't any of. It is a solid introduction to the fundamental behaviour of gases and works well as a teaching tool, which is why it is taught to the majority of university students as part of any introduction to physics. In essence, the ideal gas law enables students to comprehend ideas such as the process of thermodynamic cycles, such as an engine, the reason an airbag expands, what transpires to a balloon at high altitude, and other related ideas.
Hence, Van Der Waals equation to the ideal gas law as PVm = RT.
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An argon ion laser emits visible radiation with photons of energy 4.071 x 10-19 J. What is the
wavelength of the radiation?
Answers
The wavelength of the radiation emitted by the argon ion laser is \(4.854 * 10^-7 m\).
Wavelength is a property of any type of wave that refers to the distance between two adjacent points on the wave that is in phase, i.e., at the same point in their respective cycles. It is usually denoted by the Greek letter lambda (λ) and is measured in units of length, such as meters or nanometers.
The energy carried by the photon (E) is related to the wavelength (\(\lambda\)) through the following equation:
\(E=hc/\lambda\); where 'h' is the Plank's Constant and 'c' is the speed of light which is \(3* 10^{-7} m/s\).
We can say that
\(\lambda - hc/E\)
Now after substituting the given values, we get:
\(\lambda = (6.626 * 10^{-34} J.s * 3.00 * 10^8 m/s) / (4.071 * 10^{-19} J)\\\lambda = 4.854 * 10^-7 m\)
Therefore the wavelength of the radiation emitted by the argon ion laser is \(4.854 * 10^-7 m\).
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Enthalpy Lab + Questions NEED HELP ASAP FOR THE ANALYSIS QUESTIONS (be sure to show your work) + CONCLUSION
PURPOSE OF EXPERIMENT: To find Heat of Solution of sodium hydroxide and to find the heat of neutralization between sodium hydroxide and hydrochloric acid.
Experiment 1 Procedure:
1. Measure 50.0 mL of water (tap) into a 100 mL graduated cylinder and pour it into a large coffee cup.
2. Determine the temperature of this water
3. Measure out 2.00 g of sodium hydroxide into a piece of paper towel *tare scale!
4. Add the sodium hydroxide to the water in the coffee cup and put a small cup over it, with the thermometer through the hole. Stir GENTLY with the thermometer and record the temperature every 30 seconds for 3 minutes or until it peaks. Record this in a properly labelled table.
5. Let this stand for 45 minutes before proceeding to Exp. 2.
WHAT WE FOUND IN EXP 1:
T (temp.) initial = 20 degrees C
T (temp) FINAL = 28.5 degrees C
moles of sodium hydroxide = 0.0518mol
the molar mass of sodium hydroxide = 39.969g/mol
C (specific heat of water) = 4.184J/g degrees C
THE NUMBER OF TRIALS FOR TEMP IN EXP 1
1st trial = 21 C
2nd trial = 24.5 C
3rd trial = 26 C
4th trial = 26 C
5th trial = 28 C
6th trial = 28.5 C
7th trial = 28.5 C (final temp)
ANALYSIS FOR EXPERIMENT ONE:
1. Determine the moles of sodium hydroxide (NaOH) from the experiment.
2. Determine Qsurroundings and Qrxn
3. Determine the enthalpy for the dissociation of sodium hydroxide (delta H sol)
4. Write the thermochemical equation for the dissociation of sodium hydroxide TWO ways and write an enthalpy diagram
5. What assumptions did you make to calculate #2? (some example assumptions to make: assume that the solution is water and that heat and density COULD be the same as water, etc)
6. Research the actual value and determine the percent error
7. In terms of bonds breaking and forming, what is RESPONSIBLE FOR ENTHALPY CHANGE?
EXPERIMENT 2 PROCEDURE:
1. Measure out 50.0 mL of 0.75 concentration M HCl into a graduated cylinder
2. Measure and record the temperature of the sodium hydroxide solution from exp. 1.
3. Add the hydrochloric acid solution to the sodium hydroxide solution, put the small cup on, and record the temperature change every 15 seconds for 1 minute. Stir GENTLY. Record this in a properly labelled table (will be given below)
4. Solutions can be discarded down the sink.
WHAT WE FOUND IN EXP. 2:
T (temp) initial = 23.5 C
T (temp) FINAL = 27 C
THE NUMBER OF TRIALS FOR TEMP IN EXP 2
1st trial = 27 C
2nd trial = 27 C
3rd trial = 27 C
4th trial = 27 C (FINAL TEMP)
ANALYSIS FOR EXPERIMENT 2:
1. Determine the moles of HCl added to this mixture
2. Write the chemical equation for this reaction
3. Determine the limiting reagent
4. Determine the Qsurr and Qrxn *CONVERT TO kJ*
5. Determine the enthalpy for the neutralization reaction.
6. Write the thermochemical equation for the dissociation of sodium hydroxide TWO WAYS and write an enthalpy diagram
7. Research the actual value and determine the percent error.
8 Explain sources of experimental error for both experiments and BE SPECIFIC! (NOT CALCULATION ERRORS, SPILLING, OR LOSING REACTANTS - DO NOT COUNT AS ERRORS! They can be EXPERIMENTAL due to heat loss/gain, room temp *specific heat capacity is for 25 C*, and atmospheric pressure is constant. And they can be MEASUREMENTS - consider the precision and the potential range of error for each measurement)
9. In terms of bonds breaking and forming, what's responsible for the enthalpy change?
CONCLUSION: write a brief statement that refers to the purpose.
Answers
The difference between the energy needed to break the bonds in the reactants and the energy released when new bonds are created in the products is what essentially determines the enthalpy change.
What impact does bond breaking have on enthalpy?In general, a bond must be broken by a positive change in enthalpy, whereas a bond must be formed by a negative change in enthalpy. In other words, the process of breaking a bond is endothermic, whereas the process of forming a bond is exothermic.
What is the bond-breaking and bond-forming reaction's enthalpy change?The energy needed to break the links between the reactants less the energy released during the formation of new bonds in the products is the enthalpy of reaction.
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In terms of bonds breaking and forming, what's responsible for the enthalpy change?
How is the atomic mass of an atom determined and why are electrons not used in the calculation?
Answers
Answer:
atomic mass unit is most of the time used to measure the mass of a subatomic particle. electrons do that have enough mass for it to be considered a atomic mass unit
Explanation:
What is the difference between a proton, neutron, and electron?
Answers
Answer:
proton :
a particale or atom containing a postive charge
nuutron
a particale or atom that contains a negative charge
electron :
a particale or atom with a negative chrage.
Explanation:
proton:
a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
nuetron:
a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
elcetron:
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
Why is NO3 constant in constant in chemistry
Answers
Answer:
The rate and equilibrium constants for the reaction NO3• + Cl- ⇄ NO3- + Cl• in aqueous solutions were measured by pulse radiolysis. The formation and decay of the nitrate radical, NO3•, and the dichloride radical anion, Cl2•-, in irradiated aqueous solutions containing nitric acid and chloride ions were followed under various conditions.The process represented by A:
Answers
The process represented by A is how producers create energy.
The correct option is A.
What are producers?Producers include all types of green plants. By absorbing sunlight and using the energy to create sugar, green plants produce their food. This sugar, also known as glucose, is used by the plant to produce a variety of materials, including wood, leaves, roots, and bark.
Producers create energy through the process of photosynthesis.
The process of photosynthesis results i the production of food in the form of glucose.
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balanced equation in which K2Cr2O7 oxidizes KI in the presence of H2SO4
Answers
The balanced equation \(K_{2}Cr_{2}O_{7}\) oxidizes KI in the presence of \(H_{2}SO_{4}\)can be represented as
6 KI + \(K_{2}Cr_{2}O_{7}\) + 7 \(H_{2}SO_{4}\) → 4 \(K_{2}Cr_{2}O_{7}\) + \(Cr_{2}(SO_{4})_{3}\) + 3 \(I_{2}\)\(I_{2}\) + 7 \(H_{2}O\)
The balanced equation for the oxidation of KI (potassium iodide) by \(K_{2}Cr_{2}O_{7}\)(potassium dichromate) in the presence of \(H_{2}SO_{4}\)(sulfuric acid) can be represented as follows:
6 KI + \(K_{2}Cr_{2}O_{7}\) + 7 \(H_{2}SO_{4}\) → 4 \(K_{2}Cr_{2}O_{7}\) + \(Cr_{2}(SO_{4})_{3}\) + 3 \(I_{2}\)\(I_{2}\) + 7 \(H_{2}O\)
In this equation, \(K_{2}Cr_{2}O_{7}\) is the oxidizing agent, and KI is the substance being oxidized. The sulfuric acid (\(H_{2}SO_{4}\)) serves as a catalyst and provides the necessary acidic conditions for the reaction to occur.
The products of the reaction are potassium sulfate (\(K_{2}SO_{4}\)), chromium(III) sulfate (\(Cr_{2}(SO_{4})_{3}\)), iodine (), and water (\(H_{2}O\)).
Note that this equation represents a stoichiometrically balanced equation, ensuring that the number of atoms of each element is the same on both sides of the equation.
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Which of the following are more likely to form a solution? (select all that apply)
A) When both solute and solvent are polar
B) When both solute and solvent are nonpolar
C) When solute is polar and solvent is nonpolar
D) When solute is nonpolar and solvent is polar
Answers
Answer:A and B
Explanation:
A substance is said to be polar when it is having a dipole (a delocalised positive and negative charge) or it is ionic (dissociate into ions when dissolved in water)
Which new item, if added to the density
column, would settle and stay right in the
green dyed water layer
a. Charcoal = 0.56 g/mL
b. Glass = 1.40 g/mL
c. Paperclip = 1.00 g/mL
d. Thumbtack = 1.9 g/
Answers
Answer:
example:
aExplanation:
bicuse its true colum
Please Answer this Science question i will mark you the Brainliest
Answers
Answer: copper gold silver
Explanation: They are in the same group.
This diagram represents chlorine monofluoride.
:CI-F:
The arrow shows that the bond between the chlorine atom and the fluorine atom is
v
The electrons in the bond are pulled
and the chlorine atom
please hurry and answer!
Answers
Answer:
It appears that the diagram you provided represents the chemical compound chlorine monofluoride (CI-F). The arrow below the compound may be intended to indicate the movement or flow of electrons in the compound.
Chlorine monofluoride is a highly reactive and toxic compound that is used as a powerful oxidizing agent. It is a compound of chlorine and fluorine, with the chemical formula ClF. It is a yellowish gas at room temperature and has a strong, pungent smell. Chlorine monofluoride is highly reactive and can ignite or explode upon contact with many materials, including water. It is used in a variety of industrial processes, such as the production of semiconductors and the purification of aluminum. However, it can also be harmful to human health if inhaled or ingested, and it should be handled with caution.
Explanation:
The volume of a gas is 200.0 mL and the pressure is 2.00 atm. When the volume of the gas is 10 mL what is the pressure if the temperature remains the same?
Answers
Answer:
40 atm
Explanation:
Boyles law states that the pressure exerted on a gas is inversely proportional to the volume it occupies provided that the temperature is held constant. It is given by:
P ∝ 1/V
PV = constant
P₁V₁ = P₂V₂
Given that V₁ = initial volume = 200 ml, P₁ = initial pressure = 2 atm, V₂ = final volume = 10 ml, P₂ = final pressure. Hence:
2 atm * 200 ml = P₂ * 10 ml
P₂ = (2 atm * 200 ml) / 10 ml
P₂ = 40 atm
How many moles of N are in 0.217 g of N2O ?
Answers
1 x 10^-2.
There are approximately 0.00493 moles of N in 0.217 g of N2O.
Explanation:To determine the number of moles of N in 0.217 g of N2O, we need to convert the mass of N2O to moles using the molar mass of N2O, which is 44.0128 g/mol. We can use the formula:
moles = mass / molar mass
So, moles of N = 0.217 g / 44.0128 g/mol = 0.00493 mol. Therefore, there are approximately 0.00493 moles of N in 0.217 g of N2O.
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A teacher showed this animal to studenst on a field trip
Answers
If a teacher showed an animal to students on a field trip. The tool will allow the students to best see the animal up close is the hand lens.
Option D is correct.
What is a Hand lens?A hand lens is known as a magnifying glass which is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle.
A hand lens has two essential properties which are its focal length and its diameter.
The students will therefore require a hand lens to look up the animal close.
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#complete question:
A teacher showed this animal to students on a field trip. Which tool will allow the students to best see the animal up close? O A Tape measure O B Graduated cylinder O c. Notebook O D. Hand lens
giving brainliest answer it
Answers
Answer:
B as its not specific enough
Gas Laws
Pre-Test Active
1
2 3
5
6
O final pressure
O atmospheric pressure
O combined pressure
O partial pressure
7 8
9
10
A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide,
oxygen, and nitrogen. Which term most likely describes what she is measuring?
Answers
The term that the scientist would use in this case is partial pressure. Option D
What is the partial pressure?
The pressure that one particular gas component within a mixture of gases exerts is referred to as partial pressure. It is the pressure that the gas would experience at the same temperature if it were the only thing in the entire volume.
When researching gas mixtures, such as in gas laws, gas phase equilibria, and gas collecting methods, partial pressures are extremely crucial for the gas.
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.
Ag+1, NO3-1
+
Na+1, I-1
->
Answers
Answer:
0.3+Na
Explanation:
Which of the following is not among the elements to include on your note cards?
I. a number to identify the card and link it to a bibliography card
II. the subject (if you know what it is)
III. publishing information about the work in question
IV. your notes
A. II
B. I
C. IV
D. III
Answers
Answer:
c
Explanation:
Answer:
The answer is C
Explanation:
How much heat is required to raise the temperature of 67.0g of water from 25.7°C to
66.0°C? The specific heat of H₂O is 4.184J/g°C)
a) 40.3 kJ
b) 11.3 kJ
c) 67.0 kJ
d) 280.3 kJ
e) 2.70 kJ
Answers
The amount of heat required to raise the temperature of 67 g of water from 25.7°C to 66°C is approximately equal to 40.3 kJ. Thus, the answer is option a) 40.3 kJ.
How do you calculate the amount of heat required to raise the temperature of the water to 66.0°C?The amount of heat required to raise the temperature of a substance is given by the equation:
q = m * c * ΔT
Here, q is the amount of heat required to raise the temperature , m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature due to the heat supplied.
Substituting the given values in the equation, we get:
q = (67 g) * (4.184 J/g°C) * (66°C - 25.7°C)
q = 40,332 J
Converting this value to kilojoules we obtain:
q = 40.332 kJ = 40.3 kJ
Thus 40.3 kJ of heat energy is required to raise the temperature of 67g of water from 25.7 °C to 66° C.
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A compound with a molecular mass of 44.0 grams is found to be 81.82% carbon
and 18.18% hydrogen by mass. Finds its molecular formula. (HINT: Once you get
the mole to mole ratio you will need to multiple both by 3)
Answers
The molecular formula of the compound containing 81.82% carbon
and 18.18% hydrogen by mass is C₃H₈
From the question given above, the following data were obtained:
Carbon (C) = 81.82%
Hydrogen (H) = 18.18%
Molar mass of compound = 44 g/mol
Molecular formula =?We'll begin by calculating the empirical formula of the compound. This can be obtained as follow:
Carbon (C) = 81.82%
Hydrogen (H) = 18.18%
Empirical formula =?Divide by their molar mass
C = 81.82 / 12 = 6.818
H = 18.18 / 1 = 18.18
Divide by the smallest
C = 6.818 / 6.818 = 1
H = 18.18 / 6.818 = 2.67
Multiply by 3 to express in whole number
C = 1 × 3 = 3
H = 2.67 × 3 = 8
Thus, the empirical formula of the compound is C₃H₈
Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:
Molecular formula = Empirical formula × n = molar mass
[C₃H₈]n = 44
[(12×3) + (1×4)]n = 44
[36 + 4]n = 44
40n = 44
Divide both side by 40
n = 44/40
n ≈ 1
Molecular formula = C₃H₈ × n
Molecular formula = C₃H₈ × 1
Molecular formula = C₃H₈Therefore, the molecular formula of the compound is C₃H₈
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Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 3 to n = 1.
Answers
The energy of a photon emitted when an electron in a hydrogen atom transitions from the third to the first energy state can be calculated using the Rydberg formula. For the given transition, the energy equates to approximately 1.63 x 10^-18 Joules.
Explanation:In quantum physics, the energy of a photon emitted when an electron moves from one energy level to another in a hydrogen atom can be calculated using the Rydberg formula. The formula is E = R_H *(1/ni^2 - 1/nf^2), where R_H is the Rydberg constant for hydrogen (approximately 2.18 x 10^-18 Joules), ni is the initial energy level (3 in this case), and nf is the final energy level (1 in this case).
Plugging these into the equation, we get E = 2.18 x 10^-18 Joules *(1/3^2 - 1/1^2). Then, we find that the energy of the photon is about 1.63 x 10^-18 Joules. This energy corresponds to the energy difference between the two energy levels.
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The energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=3 to n=1 can be calculated using the Rydberg formula for hydrogen and the formula for the energy of a photon.
Explanation:The energy of a photon emitted during an electron transition in a hydrogen atom can be calculated using the formula for the energy of a photon: E = hf, where 'E' is energy, 'h' is Planck's constant, and 'f' is frequency. Moreover, when an electron in a hydrogen atom undergoes a transition from n=3 to n=1, the energy difference between these two energy levels can be calculated using the Rydberg formula for hydrogen: ΔE = RH (1/n1² - 1/n2²), where 'RH' is the Rydberg constant for hydrogen, 'n1' and 'n2' are the initial and final energy levels respectively. By substituting the values, we get ΔE = RH (1/1² - 1/3²). So, this is the energy of the emitted photon when an electron undergoes a transition from n=3 to n=1.
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Highly permeable soil that is capable of storing water is called a(n)___________.
A. aquifer
B. water table
C. irrigated system
D. groundwater reserve
Answers
Answer:
The answer is A. Aquifer
Explanation:
It stores groundwater.
Which sentence describes the relationship between an object's mass and its
inertia?
A. Changes in an object's mass have an unpredictable effect on its
inertia,
B. The larger the object's mass, the smaller its inertia,
C. Changes in an object's mass have no effect on its inertia,
D. The smaller the object's mass, the smaller its inertia,
Answers
Answer:
D
Explanation:
Mass is a measure of an objects inertia. Objects with greater mass have a greater inertia and objects with less mass have less inertia.
Answer:
A
Explanation:
because the greater the mass of an object, it will still apply to the inertia because it will also be greater.
I will mark brainliest I just need help plzzz
Answers
Answer:
Look at the picture below
Explanation:
Please help!!!!!
Please help!!!!!
Answers
Answer:
1.B
2.A
3. B
Explanation:
1. A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing
2. so 2 is electrons of one atom are transferred permanently to another atom.meaning the answer is A
3. is When atoms combine by forming covalent bonds, the resulting collection of atoms is called a molecule. We can therefore say that a molecule is the simplest unit of a covalent compound.
A chemical bond is an attraction between two atoms.
A ionic bond is A bond formed when atoms transfer electrons.