Answer:
All three titrations require the same volume of NaOH to reach the first equivalence point.
Explanation:
Statements are:
All three titrations have the same final pH.
All three titrations require the same volume of NaOH to reach the first equivalence point.
All three titrations have the same pH at the first equivalence point.
All three titrations have the same initial pH.
The pH of the titration depends of the nature of the acid: If the acid is a strong acid, pH at the equivalence of the titration is 7. For a weak acid equivalence point depends of the nature of the conjugate base and initial pH of the weak acid. For a diprotic acid also depends of the nature of the acid.
Thus:
All three titrations have the same initial pH, All three titrations have the same pH at the first equivalence point. and All three titrations have the same final pH. are the three FALSE.
As the concentrations of the acids is 0.10M and are titrated with 0.100M NaOH, The volume to reach the first equivalence point is the same for all the three acids.
Thus:
All three titrations require the same volume of NaOH to reach the first equivalence point.What information about a chemical solution can be inferred from knowing its pH value?
Answer:
See the answer below
Explanation:
The information than can be inferred from knowing the pH value of a chemical solution is the hydrogen or hydroxyl ion concentration of the solution.
The pH of a solution is the degree of acidity or alkalinity of the solution. Mathematically, the pH of a solution is expressed as:
pH = [tex]-log_{10}[H^+][/tex] where [tex][H^+][/tex] = hydrogen ion concentration.
Also,
pH = 14 - pOH, where pOH = [tex]-log_{10}[OH^-][/tex]
The more the [tex][H^+][/tex] of a solution, the lower the pH, and the more the [tex][OH^-][/tex] of a solution the higher the pH. The pH value ranges from 0 - 14 with 7 being a neutral pH.
Answer:
Explanation:
The hydrogen or hydroxyl ion concentration of the solution could be inferred from knowing its pH value.
Which acid could not be prepared by treating a Grignard reagent with CO2?
a. p-methylbenzoic acid.
b. cyclopentane carboxylic acid.
c. 4-oxopentanoic acid.
d. 3-methylbutanoic acid.
Answer:
4-oxopentanoic acid.
Explanation:
In this case, we must remember that the Grignard reaction is a reaction in which carbanions are produced. Carboanions have the ability to react with CO2 to generate a new C-C bond and a carboxylate ion. Finally, the acid medium will protonate the carboxylate to produce the carboxylic acid group.
The molecules that can follow the mechanism described above are the molecules: p-methylbenzoic acid, cyclopentane carboxylic acid and 3-methylbutanoic acid. (See figure 1)
In the case of 4-oxopentanoic acid, the possible carbanion will attack the carbonyl group to generate a cyclic structure and an alcohol group (1-methylcyclopropan-1-ol). Therefore, this molecule cannot be produced by this reaction. (See figure 2)
9.
The main difference between the salt in the Dead
Sea and salt in the school lab is that
A salt in the Dead Sea is saltier.
B salt in the Dead Sea is iodized while that
of the lab is uniodized.
C salt in the Dead Sea is sodium chloride while
that of the lab has its hydrogen replaced.
D salt in the Dead Sea is sodium chloride
while salt in the lab is either soluble or
insoluble in water.
Answer:
salt in the Dead Sea is sodium chloride
while salt in the lab is either soluble or
insoluble in water.
Explanation:
The term 'salt' in the school laboratory does not always refer to sodium chloride. It is a generic term used for many substances especially those substances formed by neutralization reaction.
There are many salts that are used in the laboratory. Some of these salts are soluble in water while some are not soluble in water.
Salt in the dead sea always refers to sodium chloride, hence, salt in the dead sea is different from salt in the school laboratory.
surface tension of solid,liquid and gas
Explanation:
Surface tension is the tendency of liquid surfaces to shrink into the minimum surface area possible. Surface tension allows insects, usually denser than water, to float and slide on a water surface.If the components of a solution are in the same state, which one is the solvent?
Answer:
Usually, the substance present in the greatest amount is considered the solvent.
During a titration, the solution with the unknown concentration is called the _____.
Answer:
Analyte.
Explanation:
Hello,
In this case, in a titration, an analyte is known as the the substance whose quantity or concentration is to be carefully determined (initially unknown) by using a titrant with a controlled volume and an accurately-known concentration which is also called a standard solution.
You can verify this by considering the attached picture.
Regards.
While in Europe, if you drive 109 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 22.0 mi/gal ? Assume that 1euro=1.26dollars.
Answer:
113.12 dollars
Explanation:
From the question we are told that you drive 109km/day and your gas milage = 22miles/gallon
Step 1
We convert 109km to miles
1 km = 0.6214 miles
109km =
109km × 0.6214miles/ 1 km
= 67.7326miles
Step 2
Since the gas mileage = 22miles per gallons, we calculated how many gallons of fuel you used in a day
22 miles = 1 gallon
67.7326 miles = x gallon
Cross Multiply
x gallon × 22 miles = 67.7326 × 1 gallon
x gallons = 67.7326 miles × 1 gallon/22 miles
x gallons = 3.0787545455 gallons
Approximately = 3.08 gallons of gas
Hence, in a day you use 3.08 gallons of gas.
Step 3
We are told that has cost 1.10 euros/ liter
Hence, we convert the amount of gas you used in gallons to liters
1 gallon = 3.785 liters
3.08 gallons = y liters
1 gallon × y liters = 3.08 gallons × 3.785 liters
y liters = 3.08 × 3.785/1
y = 11.6578 liters.
So in a day you use 11.6578 liters of gas.
Step 4
Assume that 1euro=1.26dollars.
We are also told that has = 1.10 euros per liters
We convert the amount in Euros to dollars
1 euro = 1.26 dollars
1.10 euros =
1.10 × 1.26
= 1.386 dollars
Hence gas costs 1.386 dollars per liter
Step 5
Since : 1 liter of gas = 1.386 dollars
11.6578 liters of gas =
= 11.6578 liters × 1.386 dollars/ 1 liter
= 16.1577108 dollars
Therefore, in 1 day, you spend approximately = 16.16 dollars on gas
Step 6
The final step:
We are asked to calculate how much you spent on gas in 1 week
1 week = 7 days
Therefore, if
In 1 day you spend = 16.16 dollars on gas
7 days =
= 7 × 16.16 dollars
= 113.12 dollars
Therefore, the amount money you would spend on gas in one week = 113.12 dollars.
Specify whether each compound is soluble in hexane.Classify the appropriate items to their respective category.
a. hydrogen chloride (HC)
b. hydrogen sulfide (H2S)
c. water (H2O)
d. propane (CH3CH2CHs)
1. Soluble in hexane
2. Insoluble in hexane
Answer:
hydrogen chloride (HC)- insoluble in hexane
hydrogen sulfide (H2S)- insoluble in hexane
water (H2O)- insoluble in hexane
propane (CH3CH2CH3)- soluble in hexane
Explanation:
Generally, it is a principle in chemistry that polar solvents dissolve polar substances while nonpolar solvents dissolve nonpolar substances.
This is because, dissolution of a substance in another substance depends on the kind of intermolecular interaction that is possible between the two substances. Hence, ionic substance dissolve in polar solvents due to dipole interactions and nonpolar substances dissolve in nonpolar solvents due to Vanderwaals interaction between the solute and solvent.
Hydrogen chloride, hydrogen sulphide and water are ionic substances hence they can not dissolve in hexane which is a nonpolar substance. However, propane is a nonpolar solvent hence it dissolves in hexane.
Answer: butane (CH3CH2CH2CH3) soluble
hydrogen chloride ( HCl) insoluble
hydrogen sulfide (H_2S) insoluble
water (H_2O) insoluble
Which of the following is true about the scientific method?
a
Each step is related to the others.
b
It is an iterative process.
c
All of the answers are correct.
d
It is a step-by-step process.
e
It involves a logical flow.
Answer:
It is a step by step process
Explanation:
You cannot do the experiment and lab report without following the steps
Hope this is correct and helpful
HAVE A GOOD DAY!
At a given temperature, an unknown gas takes 10.0 minutes to travel the distance helium gas travels in 1.66 minutes. What is the approximate molar mass of the unknown gas
Answer:
The molar mass of the unknown is approximate 145g/mol
Explanation:
We can relate the speed of effusion of gases with the molar mass of the 2 compounds using Graham´s law:
[tex]\frac{v_a}{v_b} =\sqrt{ \frac{m_b}{m_a} }[/tex]
Where V is speed of the gas and m molar mass of a and b gases.
Molar mass of helium is 4g/mol. As the distance of the gases is the same, we can replace the speed of effusion with the time the gas takes to travel the distance. The equation will be:
[tex]\frac{t_b}{t_a} =\sqrt{ \frac{m_b}{m_a} }[/tex]
Replacing:
[tex]\frac{10.0min}{1.66} =\sqrt{ \frac{m_b}{4g/mol} }\\6.024 = \sqrt{ \frac{m_b}{4g/mol} }\\36.29 = \frac{m_b}{4g/mol}\\145 g/mol =m_b[/tex]
The molar mass of the unknown is approximate 145g/mol422000 scientific notation form:
Choose the best answer below. If an equal number of moles of lactic acid, HC3H5O3, and potassium hydroxide, KOH, are added to water, is the resulting solution acidic, basic, or neutral? The Ka of lactic acid is 1.4 x10-5.
Answer:
Solution is basic.
Explanation:
When you add the same moles to a weak acid and strong base, you produce a neutralization reaction and a salt. For this case:
CH₃CHOHCOOH + KOH → KCH₃CHOHCOO + H₂O
If we work in a titration, this is the equivalence point where:
moles of base = moles of acid
For this reaction we are only having lactates ions on solution. All the moles from the lactic acid and the hydroxide will be neutralized to make water. As both numbers are the same, the number is the moles of the formed lactate.
If we think the equilibrium equation for lactate, we have:
CH₃CHOHCOO⁻ + H₂O ⇄ CH₃CHOHCOOH + OH⁻
In conclussion, the solution is basic, because we give OH⁻ to medium.
Notice, that in a titratrion of a weak acid and a strong base, the pH at the equivalence point is always basic.
A C≡C triple bond contains-
A) 3 σ bonds
B) 2 σ bonds and one π bond
C) one σ bond and 2 π bonds
D) three π bonds
E) one-and-a-half σ bonds and one-and-a-half π bonds
Answer:
i think its D but im not really good with this calls tho
Suppose you wanted to study the relationship between high
school graduation rate and crime. What might your hypothesis be?
What would be the independent variable in your study? The
dependent variable? What existing data could you examine to
support your hypothesis?
Answer:
Hypothesis: High school graduation rate does not have an effect on the rate of crime in the society
Independent variable: Rate of high school graduation
Dependent variable: crime
Existing data: Crime data/reports (for the duration of interest) from different (randomized) police stations and the High school graduation rate data/information (for the same duration of interest) from the schools in the same jurisdictions as the police stations.
Explanation:
1) Before conducting an experiment, a hypothesis has to be put forward. This hypothesis is then proven or unproven by the outcome of the experiment. One of the best ways of proposing a hypothesis is the use of null hypothesis, which suggests that there is no significant difference or "connection" between two variables. Here, the null hypothesis can be "High school graduation rate does not have an effect on the rate of crime in the society"
2) An independent variable is a variable whose variation is not determined or thought to be determined by the change(s) in the other variable. Here, high school graduation rate is not determined or thought to be determined by the other variable.
3) A dependent variable is a variable whose variation is predicted to be as a result of the change(s) in the other variable. Here, the rate of crime is predicted to be as a result of the high school graduation rate
4) Existing/available data that can be used to examine the hypothesis proposed earlier can be obtained from the crime data/reports (for the duration of interest) from different (randomized) police stations and the High school graduation rate data/information (for the same duration of interest) from the schools in the same jurisdictions as the police stations.
Substances that are composed of a network of atoms held together by covalent bonds are called
O A. ionic lattices
B. giant covalent structures
C. allotropes
D. diatomic networks
Answer:
giant covalent structures
Explanation:
Covalent solids are made up of atoms joined to one another by covalent bonds to form a giant lattice. The covalent bonds are very strong, this makes the giant covalent solids to be hard and possess high melting points. Covalent solids are nonconductors of electricity due to the absence of free electrons in the structure.
Diamond, graphite and boron nitride are all examples of giant covalent structures.
a chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 3.2 mL. If the metal weighs 1.5g, what is the density in g/mL of the metal?
The density of metal will be "0.469 g/mL".
The given values in the question are:
Mass of metal = 1.5 gVolume of metal or Volume change = 3.2 mLNow,
The density of metal will be:
→ [tex]Density = \frac{Mass}{Volume}[/tex]
By substituting the given values, we get
→ [tex]= \frac{1.5}{3.2}[/tex]
→ [tex]=0.469 \ g/mL[/tex]
Thus the above is the appropriate answer.
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The density of the metal is 0.47 g/mL
The density of an object is defined as the mass of the object per unit volume of the object.
Density = mass / volumeWith the above formula, we can obtain the density of the metal. This is illustrated below:
Volume of metal = change in volume of water = 3.2 mL
Mass of metal = 1.5 g
Density of metal =?Density = mass / volume
Density = 1.5 / 3.2
Density of metal = 0.47 g/mLTherefore, the density of the metal is 0.47 g/mL
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who discovered copper
Explanation:
The exact person is unkown cooper has been around for ages since 9000 BC in the Middle East are the earliest discoveries
Although various copper tools and decorative items dating back as early as 9000 BCE have been discovered, archaeological evidence suggests that it was the early Mesopotamians who, around 5000 to 6000 years ago, were the first to fully harness the ability to extract and work with copper
1. Which of the following is a physical property of hydrochloric acid?
Fizzes when it is dropped on limestone
b. Turns potassium yellow and chromate orange
is a good conductor of electricity
d. Causes corrosion of magnesium metal
Answer:
c: is a good conductor of electricity
Explanation:
One of the physical properties of hydrochloric acid is that it is a good conductor of electricity in an aqueous state.
The dissolution of hydrochloric acid in water causes a complete dissociation into [tex]H^+[/tex] and [tex]Cl^-[/tex]. The free-floating ions that result from the dissolution enable hydrochloric acid to be able to conduct electricity.
In aqueous solution, the attraction of the positive dipole of the hydrochloric acid to the negative dipole of water and that of the positive dipole of water to the negative dipole of the hydrochloric acid creates a dipole-dipole interaction that allows complete dissociation of the hydrochloric acid. Thus, electrolyte results.
Correct option: c
The following reaction is second order in [A] and the rate constant is 0.025 M-1s-1: The concentration of A was 0.65 M at 33 s. The initial concentration of A was ________ M.
Select one:
a. 0.24
b. 1.2 � 10-2
c. 0.27
d. 2.4
e. 1.4
Answer:
e. 1.4.
Explanation:
Hello,
In this case, for a second-order reaction, the integrated rate law is:
[tex]\frac{1}{[A]} =kt+\frac{1}{[A]_0}[/tex]
In such a way, for the given data, we compute the initial concentration as shown below in molar units (M):
[tex]\frac{1}{[A]_0} =\frac{1}{[A]}-kt=\frac{1}{0.65M} -\frac{0.025}{M*s}*33s \\\\\frac{1}{[A]_0} =\frac{0.713}{M}[/tex]
[tex][A]_0=\frac{1M}{0.713} =1.4M[/tex]
Therefore, answer is e. 1.4 M.
Regards.
The initial concentration of the reaction is 1.4 M.
Using the formula;
1/[A] = kt + 1/[A]o
Where;
[A] = concentration at time t = 0.65 M
t = time = 33 s
k = rate constant = 0.025 M-1s-1
[A]o = initial concentration = 0.025 M-1s-1
Hence;
1/ 0.65 = (0.025 × 33) + 1/[A]o
1/[A]o = (0.65)^-1 - (0.025 × 33)
1/[A]o = 1.54 - 0.83
[A]o = 1.4 M
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What is the rate constant of a first-order reaction when 20.0% of a reactant remains after 73.5 s?
Answer:
Half-lives of first order reactions
Explanation:
Notice the the half-life is independent of initial concentration. This is not the case with other reaction orders. The half-life of a first-order reaction was found to be 10 min at a certain temperature. hope this helps you :)
0.0453 sec⁻¹ the rate constant of a first-order reaction when 20.0% of a reactant remains after 73.5 s.
What is rate constant?The constant is indeed a proportional factor in chemical kinetics' rate equation that connects reactant molar concentration to reaction rate. It is additionally known as the pre - exponential factor or reaction rate factor and is represented by the symbol k in an equation.
The constant, k, is indeed a constant of proportionality that illustrates the connection between reactant molar concentration and reaction rate. Using the molar quantities of the reagents and the sequence of reaction, the constant may be determined experimentally. It may also be computed using the Following equations.
t1/2 = 0.693/k
Fraction remaining = 0.5n
n = number of half lives
0.20 = 0.5n
log 0.20 = n log 0.5
n = 2.32
2.32 half lives = 35.5 sec
1 half life = 15.3 sec
15.3 sec = 0.693/k
k = 0.0453 sec-1
Therefore, 0.0453 sec⁻¹ the rate constant of a first-order reaction when 20.0% of a reactant remains after 73.5 s.
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g Which ONE of the following ionic compounds is insoluble in water? A) MgCO3 B) Li2CO3 C) NH4Br D) K3PO4 E) Pb(NO3)2
Answer:
A) MgCO₃ is insoluble
Explanation:
Based on the rules of solubility:
All nitrates are soluble. That means Pb(NO₃)₂ is soluble.
All ammonium ions are soluble. NH₄Br is soluble.
All phosphate are insoluble except when combined with group I ions (Li, Na, K...) K₃PO₄ is soluble.
Also, all carbonates are insoluble except when combined with group I ions. That means Li₂CO₃ is soluble and:
A) MgCO₃ is insolubleThe radioactive atom R 88 210 a is an alpha emitter. What nucleus does it produce?
Answer:
X 86 206
Explanation:
Radioactive atoms are nuclei that can under go disintegration to emit either an alpha particle, beta particle or gamma radiation. The process could be spontaneous or stimulated.
When a radioactive atom R 88 210 emits alpha particle, it would produce an element with atomic number 86 and mass number 206 i.e X 86 206. An alpha particle is usually a helium nucleus.
[tex]R^{210}[/tex] ⇒ [tex]x^{206}[/tex] + [tex]He^{4}[/tex] + energy
An endothermic reaction is one that:
A. produces light
B. produces gas
C. involves no temperature change
D. absorbs heat
cines exam
Answer:
D. absorbs heat
Explanation:
Examples of endothermic reactions ---
1.Melting ice cubes.
2.Melting solid salts.
3.Evaporating liquid water.
Which of the following affects cell potential?
a. the standard cell potential value
b. the electronegativity of the elements in the electrodes
c. the volume of the solutions
d. all of the above
Answer:
the standard cell potential value
Explanation:
For every cell, we can calculate its standard electrode potential from the table of standard electrode potentials listed in many textbooks.
However, from Nernst's equation;
Ecell= E°cell - 0.0592/n log Q
Hence the standard cell potential (E°cell) affects the value of the calculated cell potential Ecell from Nernst's equation as stated above.
What would be the major product obtained from hydroboration–oxidation of the following alkenes?
a. 2-methyl-2-butene
b. 1-methylcyclohexene
Answer:
a. 3-methylbutan-2-ol
b. 2-methylcyclohexan-1-ol
Explanation:
For this reaction, we must remember that the hydroboration is an "anti-Markovnikov" reaction. This means that the "OH" will be added at the least substituted carbon of the double bond.
In the case of 2-methyl-2-butene, the double bond is between carbons 2 and 3. Carbon 2 has two bonds with two methyls and carbon 3 is attached to 1 carbon. Therefore the "OH" will be added to carbon three producing 3-methylbutan-2-ol.
For 1-methylcyclohexene, the double bond is between carbons 1 and 2. Carbon 1 is attached to two carbons (carbons 6 and 7) and carbon 2 is attached to one carbon (carbon 3). Therefore the "OH" will be added to carbon 2 producing 2-methylcyclohexan-1-ol.
See figure 1
I hope it helps!
59.23
An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
O the neutron and the electron
O the proton and the electron
the proton and the neutron
O the neutron and the atom
Answer:
the proton and the neutron
Explanation:
mass of The proton is approximately 1.6726 × 10^-27 Kg
mass of the electron is approximately 9.109 × 10^-31 Kg
mass of the neutron is approximately 1.6749 × 10^-27 Kg
Here we see that mass of proton and neutron is approximately similar.
_____________________________________________
Lets see what is the mass of these particle IN atm unit
mass of these particles can also be described in form of amu(atomic mass unit)
1 atm is the mass defined as 1/12 th of mass of the carbon-12(c-12) atom.
In terms of unit atm
mass of proton = 1 amu
mass of electron = 5.45 × 10−4 amu
mass of neutron = 1 amu
hence we can say that mass of proton = mass of neutron.
mass of atom is sum of mass of all the neutron and proton in the atom.
Hence, mass of neturon and atom cannot be equal.
This makes option four the neutron and the atom , the wrong choice.
correct answer is the proton and the neutron
therefore, An atom contains one proton , one electron and one neutron then, mass of proton is similar in mass of neutron.
Answer:
proton and neutron
Explanation:
7. A pair of shared valence electrons is referred to as a(n): hydrophobic effect. van der Waals interaction. ionic bond. hydrogen bond. covalent bond.
Answer:
I believe the answer is a covalent bond
For each of the reactions, calculate the mass (in grams) of the product formed when 15.93 g of the underlined reactant completely reacts. Assume that there is more than enough of the other reactant.
1) 2K(s)+Cl2(g)/15.93G→2KCl(s)
2) 2K(s)+Br2(l)/15.93→2KBr(s)
3) 4Cr(s)+3O2(g)/15.93→2Cr2O3(s)
4) 2Sr(s)/15.93+O2(g)→2SrO(s)
Answer:
1. 33.43 g of KCl
2. 23.70 g of KBr
3. 50.45 g of Cr₂O₃
4. 18.82 g of SrO
Explanation:
Molar mass of the elements and compounds in each of the reactions:
K = 39.0 g, Cl = 35.5 g, KCl = 74.5 g, Br = 80.0 g, KBr = 119.0 g, Cr = 52.0 g, O = 16.0 g, Cr₂O₃ = 152.0 g, Sr = 88.0 g, SrO = 104.0 g
1) 2K(s)+Cl2(g)/15.93G→2KCl(s)
From the mole ratio of the reaction above, 2 moles of K reacts with 1 mole of Cl₂ to give 2 moles of KCl
78.0 g (2 * 39.0 g) of K reacts with 71.0 g (2*35.5) of Cl₂ to produce 149.0 g(2*74.5) of KCl, therefore, Cl₂ is the limiting reactant.
15.93 g of Cl₂ will react to produce (149/71) * 15.93 of KCl = 33.43 g of KCl
2) 2K(s)+Br2(l)/15.93→2KBr(s)
From the mole ratio of the reaction, 2 moles of K reacts with 1 mole of Br₂ to give 2 moles of KBr
78.0 g (2 * 39.0 g) of K reacts with 160.0 g (2*80) of Br₂ to produce 238.0 g(2*119.0) of KBr, therefore, K is the limiting reactant which though is in excess.
15.93 g of Br₂ will react to produce (238/160) * 15.93 of KBr = 23.70 g of KBr
3) 4Cr(s)+3O2(g)/15.93→2Cr2O3(s)
From the mole ratio of the reaction, 4 moles of Cr reacts with 3 moles of O₂ to give 2 moles of Cr₂O₃
208.0 g (4 * 52.0 g) of Cr reacts with 96.0 g (3*2*16) of O₂ to produce 304.0 g (2*152.0) of Cr₂O₃, therefore, O₂ is the limiting reactant.
15.93 g of O₂ will react to produce (304/96) * 15.93 of Cr₂O₃ = 50.45 g of Cr₂O₃
4) 2Sr(s)/15.93+O2(g)→2SrO(s)
From the mole ratio of the reaction, 2 moles of Sr reacts with 1 mole of O₂ to give 2 moles of SrO
176.0 g (2* 88.0 g) of Sr reacts with 32.0 g (2*16) of O₂ to produce 208.0 g (2*104.0) of SrO, therefore, O₂ is the limiting reactant which though is in excess.
15.93 g of Sr will react to produce (208/176) * 15.93 of SrO = 18.82 g of SrO
1. What does the atomic number of an element represent?
O A the number of neutrons
B the number of electrons
C the number of orbitals
D the number of protons
Answer:
D The number of protons
In this simulation what do you think the bread and cheese separately represent, the atom or the molecule?
Answer:
the atom
Explanation:
The bread and cheese separately represent the atom because both bread and cheese are different from one another and we cannot assume it as a molecule because molecules formed when the group of atoms combine together by making bonds with each other and we know that bread and cheese did not make bonds with each other, they only attached, so we called them atoms not molecule.