Answers
To find out how many significant numbers there are in a number we can rely on a few rules:
1. Non-zero digits are always significant
2. Any zeros between non-zero digits are significant
3. Final zeros or trailing zeros are significant if they come after the non-zero numbers in a decimal number situation
Example: .500 and .632000
In this question, we have:
0.0016/0.849 = 0.0019, this is the correct value with the correct number of significant figures
Related Questions
If gas has a pressure of 536 and a volume of 645 liters and is 352 moles what is the new temp ?
Answers
To solve this question we have to use the ideal gas law:
[tex]PV=nRT[/tex]Where P is the pressure, V is the volume, n the number of moles, R the constant of ideal gases and T the temperature.
Solve the equation for T and replace for the given values. Remember that R has a value of 0.082atmL/molK:
[tex]\begin{gathered} T=\frac{PV}{nR} \\ T=\frac{536atm\cdot645L}{352mol\cdot\frac{0.082atmL}{molK}}=11977.54K \end{gathered}[/tex]According to this, the temperature of the gas is 11977.54K.
Which of the following statements does not describe the structure of an atom?
The electron cloud is a small and compacted space around the nucleus.
Inside the nucleus of an atom are protons and neutrons.
Protons are positively charged sub-atomic particles.
Electrons are negatively charged sub-atomic particles.
Answers
Answer:
A. The electron cloud is a small and compacted space around the nucleus.
Explanation:
Hope this helps! :))
______ oil drop experiment measured the size of the ____ on the____ .
Answers
Millikan's oil drop experiment measured the size of the electric charge on the electron.
What is an Experiment?This is referred to as a type of procedure which is carried out in other to accept or refute a hypothesis. Electron on the other hand, is the negatively charged subatomic particle which is present in an atom and are involved in the formation of new substances during a chemical reaction.
Millikan's oil drop experiment measured the size of the electric charge on the electron and used tiny drops of oil which helped in the calculation of the charge and the mass of an electron.
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When dealing with diatomic elements like oxygen, the atoms are not separate; they always come in pairs. Therefore, one mole of oxygen molecules would weigh _______ grams and not 16 grams
Answers
32 grams
Explanations:What are diatomic elements?Diatomic elements are elements that contain two atoms chemically bonded together.
When looking for the molar mass of a diatomic element, the number of atoms in the element is multiplied by the molar mass of the element.
For instance, oxygen is a diatomic element with the chemical symbol of O₂. This shows that the molar mass of oxygen will be given as:
[tex]\begin{gathered} molar\text{ mass of O}_₂=2\times16g\text{/mol} \\ molar\text{ mass of }O_2=32g\text{/}mol \end{gathered}[/tex]This shows that one mole of oxygen molecules would weigh 32 grams and not 16 grams.
Add 43.8lbs and 56.8923lbs. What is the answer in the correct significant figures?
Answers
The answer in correct significant figures of the addition of the two numbers mentioned is 100.70.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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9. Which of the following shows whose model?a. Bohrb. Daltonc. Rutherfordd. Thomson
Answers
Answer
d. Thomson
Explanation
The given model shown above is Thomson's model of an atom.
In 1898, J. J. Thomson proposed that an atom is shaped like a sphere with a radius of approximately 10⁻¹⁰m, where the positive charge is uniformly distributed as shown in the model given. The electrons are embedded in this sphere so as to give the most stable electrostatic arrangement.
Thus, Thomson's model of an atom is also referred to as the watermelon model, the plum pudding model or the raisin pudding model.
An important aspect of Thomson's model of an atom is that it assumes that the mass of the atom is uniformly distributed over the atom. The model was successful in explaining the overall neutrality of the atom.
Create a diagram of your electroplating apparatus (an electrolytic cell). Then submit your drawing with the following terms labeled correctly. Or, beginning with the positive terminal of the battery and ending with the negative terminal of the battery, describe the path that the electricity takes and where each of the following occurs: anodecathodecopper stripbatterypositive terminalnegative terminalplace where oxidation occursplace where reduction occurselectrolyte solutioncoin (or nail)direction of electron flow
Answers
Please, look at the next drawing:
Electrolytic cell: Electrical energy is used to drive nonspontaneous redox reactions.
Oxidation half-reaction: Z- => Z + e- (anode)
Reduction half-reaction: Y+ + e- => Y (cathode)
ic
Use the concentrations given to determine whether each of the following is acidic, neutral, or basic.A. [H+] = 4.3 × 10-3 mol/LB. [H+] = 9.8 × 10-12 mol/LC. [OH-] = 4.8 × 10-2 mol/L
Answers
We have the concentration of H+ ions, from these concentrations we can find the pH values of the solutions with the following equation:
[tex]pH=-log\lbrack H^+\rbrack[/tex]Where [H+] is the concentration of H+ ions.
Now, the acidity or basicity of a solution depends on the pH value. A solution above 7 will be basic, below 7 will be acidic, and equal to 7 will be neutral.
Let's determine the pH value for each solution:
[tex]\begin{gathered} pH=-log\lbrack4.3\times10^{-3}mol/L\rbrack \\ pH=2.4 \end{gathered}[/tex][tex]\begin{gathered} pH=-log\lbrack9.8\times10^{-12}mol/L\rbrack \\ pH=11.0 \end{gathered}[/tex][tex]\begin{gathered} pH=-log\lbrack4.8\times10^{-2}mol/L\rbrack \\ pH=1.3 \end{gathered}[/tex]So, we have that:
A. [H+] = 4.3 × 10-3 mol/L. pH=2.4. Acidic
B. [H+] = 9.8 × 10-12 mol/L pH = 11.0 Basic
C. [OH-] = 4.8 × 10-2 mol/L pH=1.3 Acidic
Determine the [H3O+] of a 0.150 M solution of benzoic acid.
Answers
The [H₃O⁺] of a 0.150 M solution of benzoic acid is 0.00515 M.
Benzoic acid is classified as a weak acid and it dissociates partially when it is dissolved in water. Benzoic acid has chemical formula as C₆H₅COOH and it produce the benzoate anion which is [C₆H₅COO⁻] with a hydronium cation which is [H₃O⁻].
We know that constant Ka = 1.77 x 10⁻⁴
We will write the equilibrium reaction as -
C₆H₅COOH + H₂O → H₃O⁺ + C₆H₅COO⁻
0.150 M x x x
Ka = [H₃O⁺] [C₆H₅COO⁻]
C₆H₅COOH
1.77 x 10⁻⁴ = x₂
0.150
We will solve to get the value of x -
x = [H₃O⁺] = 0.00515 M
Therefore, [H₃O⁺] is 0.00515 M.
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Predict the products for each of the following reactions. Write the molecular equation, the complete ionic equation, and the net ionic equation. Classify the reactions in as many ways as you can.
Aqueous sodium carbonate is added to aqueous hydrochloric acid.
Answers
The equation that is the net description of the ions involved is;[tex]CO_{3} ^{2-} (aq) + 2H^{+} (aq)----- > H_{2} O(l) + CO_{2} (g)[/tex]
What is the net ionic equation?The term net ionic equation has to do with the final ionic equation which does not include the spectator ions. What I mean by the spectator ions are those ions that do not undergo a change in a chemical reaction. The first step when we want to write the net ionic equation is first to write down the molecular equation and balance the equation accordingly.
We shall now show the balanced overall reaction equation of the process
Thus, the balanced molecular equation of this reaction is; [tex]Na_{2} CO_{3} (aq) +2 HCl(aq) ----- > NaCl(aq) +H_{2} O(l) + CO_{2} (g)[/tex]
The net ionic equation is;
[tex]CO_{3} ^{2-} (aq) + 2H^{+} (aq)----- > H_{2} O(l) + CO_{2} (g)[/tex]
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Tablet salt (sodium chloride) is an example of a(n): A) element B) compound C) mixture
Answers
Sodium chloride contains sodium and chlorine in its structure. Both are elemens, which means that sodium chloride is a compound.
It is not a mixture since it is not made of 2 different substance. It is a substance made of 2 elements, which means it is a compound.
The correct answer is B) compound.
What could be the third quantum number for one of the electrons in the 4penergy sublevel of bromine?A. m = -1B. m = 5C. m = +D. m = 4
Answers
Assuming the third quantum number is the question is the magnetic quantum number, it is limited by the angular momentum quantum number. This is inditaced in the quastion: since the orbital is 4p, the "p" indicates that the angular momentum quantum number is 1.
The magnetic quantum number can only be -1, 0 or +1.
The only alternative with one os these is alternative A.
A patient turns in a sample of urine for specific gravity test. The lab results record a value of1.024. What is the density of this patient's urine?
Answers
Specific gravity is the same concept for relative density. This measure indicates the density with respect to the density of water at standard temperature. The formula is:
[tex]\text{Specific gravity = }\frac{density\text{ of substance}}{density\text{ of water}},[/tex]If we are comparing pure water, the density of this would be 1.00 g/mL, so clearing the formula and replacing, we're going to have:
[tex]\begin{gathered} \text{density of substance (urine) = specific gravity }\cdot\text{ density of water,} \\ \text{density of urine = 1.024 }\cdot\text{ 1.00}\frac{g}{mL}, \\ \text{density of urine = 1.024 }\frac{g}{mL}. \end{gathered}[/tex]The density of the patient's urine is 1.024 g/mL if the specific gravity is 1.024.
PLEASE HELPPP! It’s due today! Will Mark Brainliest!
Usually scientists will a large isotope such as Uranium-235 with a ____.
The collision results in several more nuclear fissions, also known as a ____. This results in a HUGE release in energy!
Answers
Answer:
Fission and fusion
Explanation: Fission and fusion are two physical processes that produce massive amounts of energy from atoms.
Hope this helps!
Sn +Cl————SnCl4what is the limiting reactant when 15.7 g of tin reacts with 17.4 of chlorine? what mass of tin chloride can be formed?
Answers
Cl is the limiting reactant and the mass of tin chloride that can be formed is 31.9g.
- First, we need to balance the equation:
[tex]Sn\text{ + 4 Cl }\rightarrow SnCl_4[/tex]- Second, we need to know the molar weight of the compounds:
Sn: 118.7 g/mol
Cl: 35.5 g/mol
SnCl4: 260.7 g/mol
- Third, we need to know how much Sn can react with Cl according to the balanced equation:
[tex]\frac{15.7g\text{ . 142g}}{118.7g}=\text{ 18.8 g}[/tex]If 118.7g of Sn needs 142g of Cl to react according to the balanced equation, we found that the 15.7g of Sn will need 18.8g of Cl to complete the reaction.
As we have 17.4g of Cl available, we can see that we are going to need more Cl and therefore Cl is the limiting reactant.
- Now, to find the mass of tin chloride that can be formed, we use the limiting reactant amount for the calculation:
[tex]\frac{17.4g\text{ . 260.7g}}{142g}=31.9\text{ g}[/tex]According to the balanced equation we need 142g of Cl to produce 260.7g of tin chloride, so with 17.4g of chlorine we will obtain 260.7g of SnCl4.
So, the mass of tin chloride that can be formed is 31.9g.
i need help with chemistry
Answers
Answer:
2.04×10^25
Explanation:
multiply with 10^9
How many moles of copper(l) oxide contain 1.20 x 10^23 copper atoms? Include units and name of atom/molecule.
Answers
ANSWER
Number of moles = 0.1993 mole
STEP-BY-STEP EXPLANATION:
Given particles
[tex]\begin{gathered} \text{Number of particles = 1.20 }\cdot10^{23} \\ \text{Avogadro's number = }6.022\cdot10^{23} \end{gathered}[/tex]The formula for calculating moles is written below
[tex]\text{Number of moles = }\frac{Number\text{ of particles}}{\text{Avogadro's number}}[/tex]The next thing is to substitute the above parameters into the above formula
[tex]\begin{gathered} \text{Number of moles = }\frac{1.20\cdot10^{23}}{6.022\cdot10^{23}} \\ \text{Number of mole = }\frac{1.20}{6.022} \\ Number\text{ of moles = 0.1993 mole} \end{gathered}[/tex]Predict the products of the reaction described above (Information Section).Ca(NO3)2 + Li > _______ + _____
Answers
A chemical reaction is known to be balanced if the number of elements on the reactant side is equal to that of the product.
Given the reactant of a chemical reaction between calcium nitrate and Lithium, the balanced reaction is given as:
[tex]Ca(NO_3)_2+2Li\rightarrow Ca+2LiNO_3[/tex]Hence the product of the balanced chemical reaction are Calcium and Lithium Nitrate.
Which of the following formulas represent valid ionic compounds that can be made from these six elements: Al, Be, F, Li, N, and S? Select all that apply. A. AlN B. BeS C. AlLi D. LiF
Answers
The compound AlN, BeS, and LiF represents valid ionic compounds.
Ionic bonding:-
When all of the electrons are successfully transferred from one element to another, this sort of bonding is created. One element in this bonding is always a metal, whereas the other is invariably a non-metal.Thus, Al, Be, Li are metals and F, N, S are nonmetals which can form ionic bonding with each other. So, AlLi (Option C) rules out.Considering option A: - AlNThe valency of aluminum is 3 and nitrogen is of 3. The valency of the cations and the anions must be switched and subscripted in order to identify the ionic compound. Thus,Al N
3 3
Simplest ratio : - 1 1
AlN is an ionic compound and thus it is a valid ionic compound.The valency of beryllium is 2 and sulfur of 2. The valency of the cations and the anions are switched and put in subscripts to create the ionic compound. Thus,Be S
2 2
Simplest ratio : - 1 1
The ionic compound created is (b) BeS, making it a legitimate ionic compound.Fluorine and lithium both have valencies of 1. The valency of the cations and the anions are switched and put in subscripts to determine the ionic compound. Thus,Li F
1 1
The ionic compound created is (d) LiF, making it a legitimate ionic compound.To learn more about ionic compounds visit:
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2. Oxygen gas is collected at a pressure of 123 kPa in a container which has a volumeof 10.0 L. What temperature must be maintained on 0.654 moles of this gas in order tomaintain this pressure? Express the temperature in Kelvin.
Answers
Answer
T = 226.21 K
Explanation
Given:
Pressure = 123 kPa
Volume = 10.0 L
number of moles = 0.654 moles
We know R = 8.314 L kPa/mol k.
Required: Temperature
Solution:
Pv = nRT
T = PV/nR
T = (123 kPa x 10.0 L)/(0.654 mol x 8.314 L kPa/mol k)
T = 226.21 K
CanvasX &Question 16Consider the reaction: 4Na(s) + O2(8) → 2Na2O(s)
Answers
ANSWER
The mass of Na2O in grams is 123.49 grams
EXPLANATION:
Given information
The mass of sodium is 91 grams
The mass of oxygen is 34.0 grams
To find the amount of Na2O produced, follow the steps below
Step 1: Write the balanced equation of the reaction
[tex]\text{ 4Na}_{(s)}\text{ + O}_{2(g)}\rightarrow\text{ 2Na}_2O_{(S)}[/tex]Step 2: Find the number of moles of sodium and oxygen using the formula below
[tex]\text{ Mole = }\frac{\text{ mass}}{molar\text{ mass}}[/tex]Recall, that the molar mass of Na is 22.989 g/mol, and the molar mass of oxygen atom is 32 g/mol
For Na
[tex]\begin{gathered} \text{ Mole = }\frac{mass}{molar\text{ mass}} \\ \text{ Mole = }\frac{91.6}{22.989} \\ \text{ Mole = 3.985 moles} \end{gathered}[/tex]For O2
[tex]\begin{gathered} \text{ Mole = }\frac{mass}{molar\text{ mass}} \\ \text{ } \\ \text{ Mole = }\frac{34}{32} \\ \text{ Mole = 1.0625 moles} \end{gathered}[/tex]Step 3: Find the limiting reactant of the reaction
The limiting reactant is the reactant that has the least number of moles after dividing it by the coefficient of the reactant
From the reaction above, you will see that 4 moles of sodium react with one mole of oxygen to give 2 moles of sodium oxide.
For Na
[tex]\begin{gathered} \text{ Na = }\frac{\text{ number of moles}}{\text{ coefficient}} \\ \text{ Na = }\frac{3.985}{4} \\ \text{ Na = 0.99625 mole/wt} \\ \\ \text{ For O}_2 \\ \text{ O}_2\text{ = }\frac{1.0625}{1} \\ \text{ O}_2\text{ = 1.0625 moles/wt} \end{gathered}[/tex]From the above calculations, you will see that Na has the least number of moles, hence, Na is the limiting reactant
Step 4: Find the number of moles of Na2O
The Na2O can be determined using a stoichiometric ratio
Let x represents the number of moles
[tex]\begin{gathered} \text{ 4 moles of Na }\rightarrow\text{ 2 moles of Na}_2O \\ 3.985\text{ moles of Na }\rightarrow\text{ x moles of Na}_2O \\ \text{ cross multiply} \\ \text{ 4 moles of Na }\times\text{ x moles of Na}_2O\text{ = 2 moles of Na}_2O\times3.985\text{ moles of Na} \\ \text{ x moles of Na}_2O\text{ = }\frac{2\cancel{moles\text{ of Na}_2}O\times3.985\cancel{moles\text{ of Na}}}{4\cancel{moles\text{ of Na}}} \\ \text{ x moles of Na}_2O\text{ = }\frac{2\times\text{ 3.985}}{4} \\ \text{ X moles of Na}_2O\text{ = 1.9925 moles} \end{gathered}[/tex]Hence, the number of moles of Na2O is 1.9925 moles
Step 5: Find the mass of Na2O
[tex]\begin{gathered} \text{ Mole = }\frac{\text{ mass}}{\text{ molar mass}} \\ \end{gathered}[/tex]Recall, that the molar mass of Na2O is 61.9789 g/mol
[tex]\begin{gathered} \text{ 1.9925 = }\frac{\text{ mass}}{61.978} \\ \text{ Cross multiply} \\ \text{ Mass = 1.9925}\times61.978 \\ \text{ Mass = 123.49 grams} \end{gathered}[/tex]Hence, the mass of Na2O in grams is 123.49 grams
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
Na(s) + O₂(g) → Na₂O₂ (s)
Answers
Answer: 2Na(s)+O₂(g) → Na₂O₂ (s)
Explanation: Since there is only one sodium on the left side of the equation and 2 on the right all you have to do is put a 2 in front of the sodium on the left
Fill in the Blanks
Type your answers in all of the blanks and submit
- current answer: When solid potassium chlorate is heated in the laboratory it decomposes to form potassium chloride and oxygen. Consider this reaction to answer the questions below: When properly balanced the sum of the coefficients for this reaction = - 7 -. When you decompose 71.7 grams of potassium chlorate you can form a maximum of - blank2 -grams of potassium chloride and - blank3 -grams of oxygen.
When solid potassium chlorate is heated in the laboratory it decomposes to form potassium chloride and oxygen.
Consider this reaction to answer the questions below:
When properly balanced the sum of the coefficients for this reaction =
blank1 - Word Answer
7
.
When you decompose 71.7 grams of potassium chlorate you can form a maximum of
blank2 - Word Answer
Please type your answer to submit
grams of potassium chloride and
blank3 - Word Answer
grams of oxygen.
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Answers
Answer:
The correct answer is option C. Slavery is a degrading institution to all those involved. Explanation: As Douglass narrates, slavery not only degrades slaves, but slavers asWhich of the following sentences best describes Douglass’s opinion about slavery?
Calculate the shortest wavelength of light capable of dissociating the Cl–Cl bond in one molecule of chlorine if the bond energy, or bond dissociation energy, is 243 kJ/mol .
Answers
The shortest wavelength of light capable of dissociating the Cl–Cl bond in one molecule of chlorine is 493 nanometer.
The formula to calculate Energy is given as follows :
E = BE / Na
E = energy
BE = bond energy = 243 KJ / mol
Na = Avogadro number = 6.02 × 10²³
substituting the values in the formula:
E = 243 × 10³ / 6.02 × 10²³
E = 4.03 × 10⁻¹⁹ J
By using Einstein equation for photon , we can calculate the shortest wavelength :
E = (h c) / λ
E = energy
h = Planck constant = 6.626 × 10⁻³⁴ J.s
c = speed of light = 3 × 10⁸ m/s
λ = wavelength
therefore,
λ = (hc )/ E
λ =( 6.626 × 10⁻³⁴ J.s × 3 × 10⁸ m/s ) / 4.03 × 10⁻¹⁹ J
λ = 4.93 × 10⁻⁷ m
λ = 493 × 10 ⁻⁹ m
1 nm = 1 × 10 ⁻⁹ m
Shortest wavelength = 493 nanometer.
Thus, The shortest wavelength of light capable of dissociating the Cl–Cl bond in one molecule of chlorine if the bond energy, or bond dissociation energy, is 243 kJ/mol is 493 nanometer.
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How many moles are in 95 grams of aluminum (AI)?
Answers
ANSWER
3.52 moles are in 95 grams of aluminum
STEP-BY-STEP EXPLANATION:
As you can see from the question provided, you are asked to find the moles of aluminum
Given data
Mass of aluminum = 95 grams
To find the moles of aluminum, we will need to apply the below formula
[tex]\text{ Mole }=\text{ }\frac{\text{ reacting mass}}{\text{molar mass}}[/tex]From the question provided, you can see that the molar mass of aluminum was given
From your periodic table, you will see that the molar mass of aluminum is 27 g/mol
Molar mass of aluminum = 27g/mol
The next thing is to substitute the data given in the above formula
[tex]\begin{gathered} \text{ Mole = }\frac{95}{27} \\ \text{mole = }3.52\text{ g/mol} \end{gathered}[/tex]Therefore, we have 3.52 moles are in 95 grams of aluminum
Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water. What is the concentration of a solution prepared by dissolving 225 l of hcl g at 37
Answers
Answer:
149 M
Explanation:
39.When the polyatomic ion (SO4)-2 combines with the iron (III) ion, Fe+3, the formula for the compound is...Select one:a. FeSO4b. Fe2SO4c. Fe2(SO4)3d. Fe3(SO4)2
Answers
Answer
c. Fe2(SO4)3
Explanation
The polyatomic ion (SO₄)⁻² has a net charge of -2 and iron (III) ion, Fe⁺³ has an oxidation number of +3. For a compound to be formed between them, two of Fe⁺³ will need three of the polyatomic ion, (SO₄)⁻² and the formula of the compound will be Fe2(SO4)3.
Experiment 2: Copper(II) carbonate hydroxide produces one mole of water (=18.015 g/mol) for every two moles of solid product (=79.545 g/mol) produced. If 3.597 g of solid product were produced during the reaction, how many grams of water were realeased as water vapor?
Answers
can someone please help me with question 27 B please!
Answers
Answer:
Sodium carbonate + Nitric acid → sodium nitrate + water + carbon dioxide. - To write the balanced chemical reaction between sodium carbonate and nitric acid we should know the chemical formula of them. - The chemical formula of sodium carbonate is Na2CO3 and the chemical formula of nitric acid is HNO3
Explanation:
hope it help
explain the process of photosynthesis with these
Words:
Photosynthesis,
light,
water,
energy,
Carbon Dioxide,
Oxygen,
xylem,
stomata,
Sugar(Glucose),
phloem,
chloroplasts,
leaves,
roots
Be legible and neat please and thank you
Answers
Explanation:
PHOTOSYNTHESIS
This is a process in which green plants and other organisms such as bacteria and algae manufacture their own food from simple inorganic matters such as sunlight,CO2,water to produce O2,glucose and water .Plants gets water and minerals when the roots absorbs from the ground,Xylem transports water and mineral salts from the roots to all parts of the plant i.e leaves.Photosynthesis takes place in the leaves where Co2 diffuse to a leaf via the stomata and reach the chloroplast.The chloroplast maximize absorption of sunlight energy.At the end of the process,water,oxygen and glucose is produced.The manufactured food is transported to all parts of a plant from the leaves via the Phloem tissues.