Answer: Different forms of chlorophyll
Explanation:
Depending on the significance the of the chlorophyll it’s function is to absorb light, which excites electrons in the chlorophyll.
Answer:
Plant cells have an organelle called chloroplast in them. Chloroplast contains a green pigment called chlorophyll which gives plants it's green color.
Chlorophyll is important in plants as it helps the plant in producing food with the process of photosynthesis.
A 20.0 mL solution of NaOH is neutralized with 24.1 mL of 0.200 M HBr. What is the concentration of the original NaOH solution
Answer:
0.241 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
HBr + NaOH —> NaBr + H₂O
From the balanced equation above,
The mole ratio of acid, HBr (nₐ) = 1
The mole ratio of base, NaOH (n₆) = 1
Finally, we shall determine the concentration of the NaOH solution. This can be obtained as follow:
Volume of base, NaOH (V₆) = 20 mL
Volume of acid, HBr (Vₐ) = 24.1 mL
Concentration of acid, HBr (Cₐ) = 0.2 M
Concentration of base, NaOH (C₆) =?
CₐVₐ / C₆V₆ = nₐ/n₆
0.2 × 24.1 / C₆ × 20 = 1/1
4.82 / C₆ × 20 = 1
Cross multiply
C₆ × 20 = 4.82
Divide both side by 20
C₆ = 4.82 / 20
C₆ = 0.241 M
Therefore, the concentration of the NaOH solution is 0.241 M
The structure and bonding of diamond, which is formed from graphite at extreme pressures, should be similar to that of elemental:
Answer:
silicon and germanium.
Explanation :
The passage states that at extreme pressures an elemental solid assumes the structure and bonding characteristics of a heavier element in the same column of the periodic table. The structure and bonding of diamond, which is a form of carbon, would therefore be most like other elements in the same group of the periodic table as carbon. This group contains silicon and germanium.
what is the difference between chemistry with other natural science
Answer:
Hi!
chemistry;
unlike others, is more about atomic structure.
HAVE A NİCE DAY
Explanation:
GREETİNGS FROM TURKEY ツ
Answer:
CHEMISTRY means the study of matter and the different chemical reactions that any substance goes through, like, matters composition, structure, shape, state, etc. while geology, biology and physics are the other branches of science and chemistry acts as a bridge between physics and geology with biology.
hope it helps
have a nice day
Which is TRUE about the structure of the atom? Select all that apply.
a
the densest part of the atom is the nucleus of the atom
b
the outermost part of the atom is where electrons are found
c
the nucleus of the atom is where protons and neutrons are found.
d
the outer part of the atom is called the antinucleus.
e
the nucleus of the atom has a diameter of about 10-10 m.
What is water cycle ?
Answer:
is the water that passes through the carbon cycle of atmosphere
1. When a solution of an acid contains larger amount of acid, it is said to be
Answer:
highly concentrated solution of acid
2002040_MIJ COMP SCI 1_SEM 1 CR_PY
The three main types of scientific investigations are descriptive, comparative, and experimental. Which components
are included in all three types of investigations?
a scientific question
an independent variable
a dependent variable
a procedure
a control group
a conclusion
Answer:
a scientific question
Procedure
Conclusion.
Explanation:
Scientific investigation is usually carried out to explain and give answers to natural phenomenon. Now, this scientific investigation is performed through the three main types as described in the question.
With that being said, the most common parts of all types of investigation are :
1. Scientific question: In this stage, questions are usually asked on the basis of observation made which could be answered.
2. Procedure: In this stage, the dimension of the steps are followed to answer and test the scientific question.
3. Conclusion: This is the primary aim that we check when done with our sample values
Select the correct text in the passage.
Explanation:
Oceans can influence weather and climate. For example, cities located near large water bodies like oceans tend not to have extreme climates
What is the percent by volume of alcohol, in a solution containing 24 mL of alcohol dissolved in 90 mL of water?
Answer:
use this formula it will help u .
Explanation:
If 60 ml of ethanol is diluted to a final volume of 400 ml, you create a 35 % ethanol solution.
First, realize that you creating a solution with that contains a polar solute (ethanol) with a polar solvent (water). Remember that "like dissolves like."
If you pour 60 ml of ethanol in a volumetric flask, you add 340 ml of water to dilute this solution to a final volume of 400 ml.
Volumetric flasks are designed to make or dilute solutions to specified final volume.
Since you have 60 ml of ethanol in a total solution of 400 ml, the percentage of ethanol is 35 %.
This result is obtained in the following manner.
ml/400. ml. = .35
.35 x 100% = 35 %
Which idea behind the shape of molecules includes the concept that electrostatic repulsion between electron pairs surrounding an atom causes these pairs to be separated as far as possible
Answer:
VSEPR theory
Explanation:
The valence shell electron pair repulsion theory was propounded by Gillespie and Nylom (1957).
The entire idea of the VSEPR theory is that the shape of a molecule depends on the electrostatic repulsion between electron pairs surrounding the central atom in a molecule which causes these pairs to be separated as far as possible.
The shapes of many molecules can be accurately predicted based on this model.
I am having trouble converting :(
Answer:
For the first question, to determine the total number of molecules of nitrogen dioxide, first make use of the molar mass of the nonpolar compound and then use that to find the total number of moles and then subsequently after make use of the ratio for the Avogadro's number to determine the total number of molecules of this compound.
For the final question, do the inverse, where we make use of the molecules of the compound and then use Avogadro's number to determine the moles of the compound and then use the same molar mass of the compound to determine the grams of the Nitrogen Dioxide.
Calculate the molarity of 198 g of barium iodide (Bal2) in 2.0 l of solution
Answer: The molarity of 198 g of barium iodide [tex](BaI_{2})[/tex] in 2.0 L of solution is 0.253 M.
Explanation:
Given: Mass = 198 g
Volume = 2.0 L
Molarity is the number of moles of solute present in liter of a solution.
Moles is the mass of a substance divided by its molar mass. So, moles of barium iodide (molar mass = 391.136 g/mol) is calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{198 g}{391.136 g/mol}\\= 0.506 mol[/tex]
Now, molarity is calculated as follows.
[tex]Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.506 mol}{2.0 L}\\= 0.253 M[/tex]
Thus, we can conclude that the molarity of 198 g of barium iodide [tex](BaI_{2})[/tex] in 2.0 L of solution is 0.253 M.
I am doing a lab and I am not sure how to calculate the concentration of the chemical formulas used in the lab. Would I need to use the 15ml and add it to the 10 ml of the first solution to find the concentration. Thank you
Answer:
C = m/V
Explanation:
In order to calculate the concentration of a mixture you would need to use the formula for concentration, which is the following...
C = m/V
In this formula C is the concentration, m is the mass of the compound that is being added and mixed into the solution, and V is the total volume of the mixture. The mass of m is in terms of number of moles. Therefore, we would need more information in order to calculate the actual concentration of the mixture that you are trying to find in this scenario. Using the formula above should be enough using the values that you have in your actual workbook.
The laboratory test of a patient shows blood calcium level of 8.8meq/l. How many moles of calcium ions are in 0.50l of blood?
Answer:
2.2 × 10⁻³ mol
Explanation:
Step 1: Calculate the number of equivalents in 0.50 L of blood
The blood calcium level of 8.8 meq/L.
0.50 L Blood × 8.8 meq/L = 4.4 meq = 4.4 × 10⁻³ eq
Step 2: Calculate the number of moles of calcium
Calcium has a charge of 2. Thus, it has 2 equivalents per mole.
4.4 × 10⁻³ eq × 1 mol/2 eq = 2.2 × 10⁻³ mol
hey i have personal question! um is it safe to use a shower head / faucet for a pleasure thing.. like will it lead me to std’s/sti’s….? infections? will it harm anything? help me pls!
Answer: Dont let the water get inside your private area because it can lead to you washing out the healthy bacteria in your private area !
Explanation:
Also dont do it because you dont know if your water is clean enough for that ..
A television wave has a_____
wavelength than an infrared wave
Answer:
Longer
Explanation:
:)
1. Which of the following species exhibit tetrahedral geometry?
a. CCl4 b. PCI5 c. NH3 d. CO2
2. Which statement correctly describes the Valence Shell Electron Pair Repulsion (VSEPR) Theory? The valence electron pairs are__________.
a. The valence electron pairs are given by the group number in the periodic table.
b. The valence electron pairs are the outermost electrons of the atom that areinvolved in the bonding.
c. The valence electron pairs repel one another and tend to stay as far apart aspossible.
d. The valence electron pairs are the lone pairs of the atom.
3. Which of the following statements about resonance is TRUE?
I. Resonance hybrids occur because a compound changes back and forth between two or more resonancestructures
II. Resonance structures differ in the arrangement of electrons but not in the arrangement of atoms.
III. Resonance hybrids contain delocalized electrons.
IV. Resonance structures for a given compound always contribute equally to the resonance hybrid.
V. Resonance structures occur when there are two or more valid Lewis structures for a given compound.
VI. Resonance hybrids are a composite of resonance structures.
a.I, II, V, VI
b. II, III, IV, VI
c. II, III, V, VI
d. II, IV, V, VI
4. How many resonance forms will nitrate ion (NO3) have?
a. - 1 b. 1 c. 2 d. 3
5. What is the first noble gas?
a. Xenon b. Radon c. Helium d. Krypton
6. What is the principle used for filling of atomic orbitals?
a. Azimithual Principle
b. Hund's Principle
c. Pauling's Exclusion Principle
d. Aufbau Principle
7. How many electrons can "m" shell accommodate?
a. 16 b. 17 c. 18 d. 19
8. What number of shells used for the accommodation of electrons in an atom? a. one b. two c. three d. four
9. What distribution does the electron configuration describe?
a. protons
b. neutrons
c. electrons
d. ions
10. How many total electrons can the "p" orbitals hold?
a. 3 b. 1 c. 7 d. 6
11. Who are the founding fathers of Quantum Mechanics?
a. Werner Karl Heisenberg
b. Isaac Newton
c. Erwin Schrodinger
d. a and c
12. There are _types of quantum numbers.
a. 2 b. 4 c. 5 d. 7
13. Which of the following elements can only form one bond in a Lewis structure? a. H b. O c. Al d. N
14. Which rule states that electron will go into empty orbitals of the same energy before entering into an orbital with an electron present?
a. Hand's rule
b. Hund's rule
c. Pauli Exclusion Principle
d. Aufbau Principle
15. What is the definition of diamagnetic atom?
a. An atom where all of the electrons are paired
b. An atom where some of the electrons are paired.
c. An atom where none of the electrons are paired.
d. An atom attracted to a magnetic field.
Answer:
a
Explanation:
Its because ammonium has thee hydrogen atoms
AYUDA DOY CORONA
Numero masico del oro
Answer:
huh what?
Explanation:
Is 196,96657 u
I hope I've helped :)
classify each of the following solids as ionic,metallic, molecular, network (covalent)or amorphous?
1) Tetra phosphorous deicide(P4O10)
2)Graphite
3) Ammonium phosphate (NH4)3po4
4) Brass
5)SiC
6)Rb
7)l2
8)LiBr
9)P4
10) Plastic
11)Si
Answer;
P4O10 - molecular solid
Graphite - network solid
Ammonium phosphate - ionic
Brass - metallic
SiC - network solid
Rb- metallic
I2 - molecular
LiBr- ionic
P4 - molecular
Plastic - amorphous
Si - network
Explanation:
An ioinc solid is made up of a pair of oppositely charged ion held together by electrostatic interaction between the bonding species.
A covalent solid is a solid in which the atoms involved in the solid are bonded together by covalent bonds. Covalent solids are also molecular.
Metals are held together by interaction of metal ions and a sea of electrons. This is called the metallic bond.
A network solid is composed of covalently bonded atoms that repeat itself in a definite manner. E.g SiC
During an experiment, solid iodine was placed in a sealed container. The container was gradually heated and purple-colored vapors of iodine formed were observed. Describe this system when it reaches phase equilibrium. (10 points)
Answer:
See explanation
Explanation:
For a chemical system in a state of dynamic equilibrium, the rate of forward reaction is equal to the rate of reverse reaction.
For this system under consideration;
I2(s)⇄I2(g)
When we heat the container, solid iodine is converted into purple coloured iodine vapour.
When equilibrium is achieved in the system, there will be no net change in the amount of solid iodine and iodine vapour present in the system since the rate of forward and reverse reactions are equal for a system in a state of equilibrium.
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how many moles are in 6.4grams of copper
Answer:
exactly 0.10071444308 mols or just 0.1 mols
Explanation:
converting 6.4 g of copper to moles is done by using it's Molar Mass we can find the Molar Mass by lookin at the periodic table or just googling it. In this case, copper's molar mass is 63.546g per Mole. so thats 6.4/63.546 = 0.015736631731344 moles of copper
Help me please please
where is the directions here?
I cannot answer this if no directions
O2 oxygen is diatomicO + O O=O Double Bond
Answer:
O 100
Explanation:
Could anyone provide me with a run down on Electrolysis?
Answer:
La electrólisis es un proceso físico por el que se descompone una sustancia en disolución a través de la corriente eléctrica. Para que la electrólisis sea posible es necesaria una fuente de alimentación continua, una disolución iónica y dos polos (ánodo y cátodo), que atraen hacia sí los iones de signo opuesto.
HELP ASAP!! PLZ
What information is needed to determine a molecular formula?
A. The empirical formula and the molarity of the solution
B. The empirical formula and the empirical formula mass
C. The empirical formula and the percent composition
ОО
D. The empirical formula and the molar mass
SUBMIT
D. The empirical formula and the molar mass
Calculate the numerical Kc value for the following reaction if the equilibrium mixture contains 0.51 M CO , 0.30 M H2 , 1.8 M CH4 , and 2.0 M H2O.
CO(g) + 3H2 (g) ⇌ CH4 (g) + H2O (g)
Show work
Answer:
uh i think this is the answer
Explanation:
Which of the following equalities is not correct?
a. 1 cm^3 = 1 mL
b. 1000 mm = 1 m
c. 100 cg = 1 g
d. 10 kg = 1 g
Answer:
a. 1 cm^3 = 1 mL
explanation:
14. Which of the following alkanols on oxidation is most likely to yield the
compound below?
CHICHICOOON
.CO
(A) Butanol (B) Propan-2-ol(2-methylbutan-1-ol (D) 2-methylpropan-1-
ol (E) 2-methylpropan-2-ol.
Answer:
A
Explanation:
I think that is the ans but am not sure
Answer:
2-methylpropan-1-ol.
Explanation:
[tex]{ \tt{CH _{3}CH(CH _{3})CH _{2}OH}}[/tex]
(d) (i) How can the water molecules from the iceberg end up as water in the lake?
Explanation:
If the iceberg is near the lake and the water molecules melt, then the molecules will slide down. The iceberg could be melting for many reasons - it can be purposely destroyed, the sun could be melting it, or it might naturally fall in. So, this is the answer to your question. Hope it helps!
