The modern cell theory explains the relation between the cells and the living things.
The Scientific knowledge is durable yet subject to change. Science is a social activity. The scientific knowledge includes the generalized collection of the laws and the hypothesis. scientific knowledge is used to generate the logical data and the knowledge. scientific knowledge is used to investigate the data to explain the phenomena. scientific knowledge involves the experiments and the data collection. the scientific knowledge is very important because it helps us to understand ourselves and the world.
Thus, The modern cell theory explains the relation between the cells and the living things.
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According to US law, when are the Miranda rights required to be read to someone?
A.
before a citizen talks to any police officials
B.
before a person testifies in a court case
C.
before an investigator collects evidence from someone’s home
D.
before a suspect in custody is questioned
This isn't chemistry but I believe the answer is D, before a suspect in custody is questioned.
Hope this helped.
Answer: D
Explanation:
Write any four properties of fullerence (c60)
[tex]{ \boxed{ \blue{ \sf{properties \: of \: fullerence}}}}[/tex]
• Man made allotrope of carbon obtained from graphite which when treated with [tex]CS_{2}[/tex]
• sp² hybridised.
• Dark shining and conducts electricity.
• It has 20 hexagonal and 12 pentagonal.
Answer options:
electric current
mass
candela
second
Kelvin
amount of a substance
volume
meter
Explanation:
time ➟ second
temperature ➟ Kelvin
ampere ➟ electric current
luminous intensity ➟ candela
mole ➟ amount of a substance
liter ➟ volume
length ➟ meter
Answer:
Explanation:
Kilogramm → mass
Ampere → electric current
Mole → amount of a substance
Liter → volume
What theoretical mass of NaCl would result from reacting 3.0
moles of NaHCO3 with excess HCI (aqueous)
The theoretical mass of NaCl would result from reacting 3.0 moles of NaHCO3 with excess HCI is 175.32 g.
This problem is solved by using the concept of moles:
What is mole?Mole is a term which is defined as a ratio of theoretical mass of compound to the molar mass of compound.
Mathematically,
Moles = given mass/molar mass
Molar mass of NaCl = 58.44 g/Mol
Now we have to calculate the moles of NaCl
[tex]NaHCO_{3} + HCl = > NaCl + H_{2}O + CO_{2}[/tex]
From the chemical equation, we noticed that moles of NaHCO3 is equal to moles of NaCl.
Since moles of NaHCO3 = 3
Therefore, moles of NaCl = 3
Now, by substituting all the values, we get
Theoretical mass of NaCl = 3 x 58.44 = 175.32 g
Thus we concluded that the theoretical mass of NaCl would result from reacting 3.0 moles of NaHCO3 with excess HCI is 175.32 g
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Write the nuclear equation for the Alpha decay (emits 1 Alpha particle) of a radioactive
Radium-226 isotope.
The nuclear equation for the Alpha decay of a radioactive Radium-226 isotope is ²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He
The sun of the mass numbers of the reactant equal the sum of the mass numbers of the product and radium 226 decay by alpha particles radiation to an inert gas and radon 222 which also decay by alpha particle radiation and due to the short half life of radon 222 there is high probability it will decay in the body and alpha particle is a helium nucleus it contain 2 proton an 2 neutron foe mass number of 4 and during alpha decay an atomic nucleus emit an alpha particles and it transform into an atom with atomic number 2 less and mass number 4 less
And the radium 226 decay through alpha particles emission to form radon 222 according to the equation ²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He
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Thus, radium-226 decays through α-particle emission to form radon-222 according to the equation:
How many atoms of calcium are present in 83.4 g of calcium?
Answer:
1.25*10^24 atoms with sig figs
Explanation:
To find the number of atoms, an easy way to do this would be to convert the mass to the number of moles, then convert moles to the number of atoms.
There are 40.08 grams of calcium per mole, so 83.4 grams of calcium would have 83.4/40.08 moles of calcium, or about 2.081 moles of calcium
Each mole of something contains about 6.022*10^23 of that something, so 2.081 moles of calcium atoms would equal 2.081 *(6.022*10^23) atoms. 2.081 *(6.022*10^23) equals 1.25*10^24, so there would be 1.25 * 10^24 atoms in 83.4 grams of calcium
Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water (H₂O) and carbon dioxide (CO₂)
chemically react to form the simple sugar glucose (C6H₁206) and oxygen gas (O₂).
What mass of water is consumed by the reaction of 8.86 g of carbon dioxide?
Be sure your answer has the correct number of significant digits.
The mass of water is consumed by the reaction of 8.86 g of carbon dioxide is 3.62 g.
The balanced chemical equation for photosynthesis is given by:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Therefore, from the above reaction it is clear that 6 moles of carbon dioxide and 6 moles of water combines to produce 1 mole of glucose sugar and 6 moles of oxygen.
The molar mass of carbon dioxide is 44.01 g/mol.
Therefore, the number of moles of carbon dioxide in 8.86 g of CO₂ is :
Number of moles of CO₂ = (8.86 g) ÷ (44.01 g/mol )
=0.201 moles
From the balanced chemical equation 6 moles of water is consumed with CO₂.
Number of moles of water = 6moles H₂O ÷ 6moles CO₂ × 0.201mol CO₂
= 0.201 mol
The molar mass of water is 18.01 g/mol.
Therefore the mass of water consumed is :
Mass of water = Number of moles of water × Molar mass of water
= 0.201 mol × 18.01 g/mol
= 3.62 g
Hence, the mass of water is consumed by the reaction of 8.86 g of carbon dioxide is 3.62 g.
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From the equations above, which compound dissolved in water would conduct the most electricity?
C₂H5O
CuSO
HF
What is the molecular electron configuration of [tex]O_{2}[/tex]
The electron configuration of O₂ is 1s² 2s² 2p⁴.
What is meant by electron configuration?Electron configuration can simply be defined as the arrangements of electrons of atoms of elements in the orbitals or electrons shells. In order words, it simply means putting the electrons in order from the smallest orbital or shell to the biggest one.
That being said, from the task given above, the atomic number of oxygen is 8, meaning that if we are put down, the electron configuration of oxygen, we will have to distribute 8 electrons around its orbitals. An atom simply means the smallest particle of an element which can take part in a chemical reaction. An element is a substance which cannot be splitted into simpler forms by ordinary means.
So therefore, we can now confirm and deduce from the explanation above that electron configuration of the oxygen atom or element is the distribution of electrons around its orbitals.
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A 32.9 L sample of a gas at constant pressure increases in temperature from 25C to 45C. Should the volume increase or decrease?
If the temperature of the sample of gas changes from 25°C to 45°C, the volume of the gas will increase.
What is Charles's law?Charles's law is the gas law stating that the density of an ideal gas is inversely proportional to its temperature at constant pressure.
In other words, the law states the volume of a gas is directly proportional to the temperature of the gas. The equation is given as follows:
V₁/T₁ = V₂/T₂
Where;
V₁ and T₁ are the initial volume and temperatureV₂ and T₂ are the final volume and temperature respectively.According to this question, a sample of a gas at constant pressure increases in temperature from 25°C to 45°C. This means that as the temperature increases, the volume also increases.
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Explain, using the terms "energy state" "electrons" and "light" how the colors of a flame test are produced .
The terms "energy state" "electrons" and "light" colors of a flame test are produced is because excitement of electron caused by the increased temprature
The color observed during the flame test result from the excitement of the electron caused by the increased temprature and the electron jumps from their ground state to a higher energy level and as they return to their ground state they emit visible light and the flame test is an analytical procedure used in chemistry to detect the presence of certain element and primarily metal ion and based on each element characteristics emission spectrum the color of flames in general also depend on temprature and oxygen and it sees the different color in the flame
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Conservation of matter article questions
The Law of conservation of mass states that option C: matter is neither created nor destroyed.
What is the law of conservation of matter?Physical and chemical changes can cause matter to transform into different forms, but no matter what happens, matter is always conserved. There is no creation or destruction of matter; the amount of matter is the same before and after the transformation.
The principle of matter conservation. argues that matter cannot be generated or destroyed during a chemical reaction. The same number of atoms exist before and after the alterations even though the matter may shift from one form to another. reactant.
Therefore, According to the principle of mass conservation, neither chemical processes nor physical changes can create or destroy mass in an isolated system. The mass of the products and reactants of a chemical reaction must be equal, in accordance with the law of conservation of mass.
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See full question below
1. Multiple-choice
Q.
Conservation of matter article questions
Law of conservation of mass states that
answer choices
matter is created
matter is destroyed
matter is neither created nor destroyed
matter does not change
PLS HELP HIGH POINTS
Which term describes this reaction?
~KIK-TK
H3N+-C-C
addition
Ocondensation
x elimination
O substitution
H-N-C-C
H₂O
H₂N-C-C-IN-C-C
HHH
Answer:
Condensation
Explanation:
We can see that H2O is formed when the two molecules join together, which is a characteristic of Condensation polymerization
There are 4.9875 mol C, 7.9802 mol H,
and 2.00 mol O in the sample.
Divide each by the smallest number of
moles. What is the ratio for the C?
Do not round your answer
2.48925 C : ? H : ? O
The ratio of the carbon to other atoms would be 2.49375:3.9901:1.000 and the empirical formula of the compound would be [tex]C_2H_8O[/tex]
Empirical formulaThe compound contains C, H, and O according to the following information:
C = 4.9875 mol
H = 7.9802 mol
O = 2.00 mol
In order to obtain the empirical formula of the compound, divide the mol of each atom by the smallest mol. In this case, the smallest mol is 2.00
C = 4.9875/2.00
= 2.49375
H = 7.9802/2.00
= 3.9901
O = 2.00/2.00
= 1.0000
Thus, the ratio of carbon to the rest of the atoms present in the compound is 2.49375:3.9901:1.000
In order to find the empirical formula of the compound, the mole of each atom needs to be approximated to the nearest whole number.
C = 2
H = 8
O = 1
Thus, the empirical formula of the compound is [tex]C_2H_8O[/tex].
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what is the energy of light having a frequency of (1.68x10^14)?
Answer:
1.11 x 10⁻¹⁹ J
Explanation:
To calculate the energy of the light, you need to use one of Einstein's equations:
E = hf
In this equation,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J·s)
-----> f = frequency (Hz)
You can plug the constant and given value into the equation and solve for "E". The final answer should have 3 sig figs like the given value.
E = hf <----- Einstein's equation
E = (6.626 x 10⁻³⁴ J·s)(1.68 x 10¹⁴ Hz) <----- Insert values
E = 1.11 x 10⁻¹⁹ J <----- Multiply
The density of a cube is 2.0gcm3. If the mass is 128 g, what is the length of each side of the cube?
Report your answer with two significant figures.
Taking into account the definition of density, the length of each side of the cube is 4 cm.
Definition of densityIn other words, density is a quantity that allows to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Length of each side of the cubeIn this case, you know that:
Density= 2 g/cm³Mass= 128 gVolume= ?Replacing in the definition of density:
2 g/cm³= 128 g÷ volume
Solving:
2 g/cm³× volume= 128 g
volume= 128 g÷ 2 g/cm³
volume= 64 cm³
The volume of a cube is equal to the measure of its side to the cube. That is to say:
Volume = side x side x side = side³
So, the length of each side of the cube can be calculated as:
64 cm³= side³
∛64 cm³= side
4 cm= side
In summary, each side of the cube has a measure of 4 cm.
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This element has 66 electrons in its electron cloud.
Answer:
below
Explanation:
From periodic table this is dysprosium
Between Chlorine and Aluminum which ones electrons would be closer to the nucleus ? Explain your answer.
Answer:Electrons that are closer to the nucleus are in filled orbitals and are called core electrons. Valence electrons are farthest from the positive charge
Explanation:
This element is in Period 3 and Group 16. write the element symbol!!
In Period 3 and Group 16, Sulfur is present and has the element symbol is ''S''.
What is Sulfur and its properties?Sulfur is a chemical element having the symbol S and its atomic number 16 and belongs to group 16. It is abundant around the world and nonmetallic under normal conditions. Sulfur element is used in the vulcanization of black rubber such as a fungicide and black gunpowder. Most element of sulfur is used in the production of acid known as sulfuric acid, which is the most important chemical produced by civilizations of the west.
Element of sulfur is lowly toxic to people but ingesting too much sulfur may cause a burning effect or diarrhea. Breathing in sulfur dust can damage the airways or cause coughing. It can irritate to the skin and eyes of a person.
So we can conclude that Sulfur is the element that is located in Period 3 and Group 16.
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1. When mountain climbers hike up Mount Everest, they carry bottles of oxygen because the pressure decreases. At the top, the pressure can reach as low as 0.20 atm. If they bring 15 L of oxygen, stored at a pressure of 40 atm, what will be the volume of the gas when it is released at the top of the mountain? Assume that the temperature does not change as you climb the mountain.
Answer:
V2 = 0.075 L
Explanation:
P1= first pressure
P2= second pressure
V1= first volume
V2= second volume
P1V1 = P2V2=
(0.20 atmospheres)(15 L) = (40 atmospheres)V2=
V2 = (0.20 atmospheres)(15 L)/(40 atmospheres)=
V2 = 0.075 L
how are the volume of the container, the pressure of the gas, the number of gas particles, and the temperature of the gas related?
Taking into account the definition of Ideal Gas Law, the volume of the container, the pressure of the gas, the number of gas particles, and the temperature of the gas are related by the Ideal Gas Law.
Ideal Gas LawAn ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law:
P×V = n×R×T
where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances. n is the number of moles of the gas. SummaryIn summary, the volume, the pressure, the number of gas particles, and the temperature are related by the Ideal Gas Law.
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Side effects can occur when chemists experiment with clinical drugs.
True or False
Answer:
True. When chemists experiment with clinical drugs, they may inadvertently create new side effects that were not present in the original drug. Additionally, the new drug may interact with other drugs in unexpected ways, which can also create new side effects.
Select one element from the periodic table and describe its most common isotopes. Then select one of the isotopes and characterize how this isotope impacts the environment and/or living organisms.
Identify the various isotopes of the element you selected and include the percent abundance for each.
Identify the number of protons, electrons, and neutrons for each isotope.
Include an image or drawing of the isotope notation for each.
Describe how your selected isotope can be used as a research tool in environmental science or medicine.
Properly cite any sources that you use to support your ideas (you should use at least one source)
The element selected is carbon and the isotopes are carbon-12, carbon-13, and carbon-14.
The number of protons, electrons, and neutrons for each isotope of carbon are as follows:
carbon-12 - 6 electrons, 6 protons, and 6 neutronscarbon-13 - 6 electrons, 6 protons, 7 neutronscarbon-14 - 6 electrons, 6 protons, and 8 neutronsThe isotope notation for each is¹²₆C, ¹³₆C, and ¹⁴₆C.
The carbon-14 isotope is used in the radioactive dating of substances.
What are isotopes?Isotopes are atoms of the same element that differ from each other in their masses.
Isotopes of the same element have different masses as a result of the difference in the number of neutrons in the nucleus of the atoms of the element.
The existence of isotopes of elements accounts for why the atomic masses of elements are not whole numbers.
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Calculate the volume (in milliliters) occupied by a 0.327g sample of CO2 gas at 22.5°C and 755 Torr.
The volume (in milliliters) occupied by a 0.327 g sample of CO₂ gas at 22.5 °C and 755 Torr is 0.115 L.
The ideal gas equation is given as :
P V = n RT
where,
P = pressure = 755 torr = 0.99 atm
V = volume
n = moles
R = gas constant = 0.0821 atm L / mol K
T = temperature = 273 + 22.5 = 295.5 K
mass of CO₂ = 0.327 g
molar mass of CO₂ = 44 g
number of moles of CO₂ = mass / molar mass
= 0.327 / 44
= 0.0047 mol
P V = n R T
V = (n RT) / P
V = ( 0.0047 × 0.0821 × 295.5 ) / 0.99
V = 0.115 L
Thus, The volume (in milliliters) occupied by a 0.327 g sample of CO₂ gas at 22.5 °C and 755 Torr is 0.115 L.
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What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ____C2H5OH(l) + ____O2(g) → ____CO2(g) + ____H2O(l)
Answer:
3
Explanation:
at first try balancing the carbon first. At first multiply 2 with CO2, that produces 2 carbon and 8 oxygen. On reactant side we have 3 Oxygen. Now look at Hydrogen. There are 6 hydrogen atoms on the reactant side. So you need to multiply 3 with H20 to be 6 hydrogen atoms as 3*2 = 6.
Final reaction: C2H5OH + 3O2 ------> 2CO2 + 3H2O
What does this image BEST represent?
Closeup of a glass windsheild, three impact points can be seen with shattered glass radiating outwards from the center.
A.
trace evidence
B.
radial fractures
C.
chemical properties
D.
class characteristics
The option that best represent the depiction of the Closeup of a glass windshield is option A: trace evidence
How do you compile evidence of glass breakage?In paper bindles, coin envelopes, pill boxes, or film cans that can be tagged and completely sealed, place the little glass pieces before placing them in the last. Put big glass pieces in boxes. Use cotton or tissue to cushion individual pieces while shipping to avoid breakage and damaged edges.
Note that the field of forensic science known as "trace evidence analysis" focuses on the minute transfers of materials that are invisible to the unassisted eye.
Hence, Trace evidence must be handled carefully and analyzed using specialist methods.
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what is the color of the solution after the endpoint is reached at a ph of 8?
The color of the solution after reaching a pH of 8 is pink.
In the process of titration of acetic acid with aqueous NaOH, phenolphthalein is used as an indicator. Phenolphthalein is nearly colorless in acidic solutions, but it turns the solution into pink at a pH of 8.
As you titrate vinegar, we can observe that the pink color is more persistent as we add more base. When a faint pink color persists for at least 30 seconds, we can understand that the endpoint has been reached.
The pH scale ranges between 0 - 14, if the pH is below 7 it indicates acidic, if it is exactly 7 then it indicates neutral and if it is greater than 7 it indicates a base.
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Given the following chemical rxn for potassium chloride mixed with sodium hydroxide:
0.25 mol KCl is mixed with 0.25 mol NaOH in a calorimeter, the temperature of
3.33 x 102 g of the solution increases from 27.0°C to 35.5°C. The specific heat of the solution
(water) is 1.00 cal/g°C.
Calculate the quantity of energy (Q= ms x AT, x SH,) evolved in the reaction:
9(A).- AT, =
(show your calculations, print neatly)
9(B).-Q=
(show your calculations, print neatly)
The quantity of heat energy evolved in the reaction, given that 0.25 mole of KCl is mixed with 0.25 mole of NaOH in a calorimeter is 2830.5 calories
How do I determine the quantity of heat evolved?To obtain the heat energy evolved, we shall begin by obtaining change in the temperature of the water. This is obtained as follow:
Initial temperature (T₁) = 27 °CFinal temperature (T₂) = 35.5 °CChange in temperature (ΔT) =?ΔT = T₂ - T₁
ΔT = 35.5 - 27
ΔT = 8.5 °C
Finally, we shall determine the quantity of heat energy evolved in the reaction. Details below
Mass of water (M) = 3.33×10² gChange in temperature (ΔT) = 8.5 °CSpecific heat capacity of solution (C) = 1 Cal/gºC Quantity of heat energy (Q) =?Q = MCΔT
Q = 3.33×10² × 1 × 8.5
Q = 2830.5 calories
Thus, the quantity of heat energy evolved is 2830.5 calories
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Which property of liquids explains why a glass of water can be filled over the brim without spilling?
Answer:
Surface tension due to cohesion
Explanation:
Water molecules are polar meaning they have dipoles. The hydrogen end is partially positive while the oxygen end is partially negative. This is because oxygen with high atomic mass attracting most of the molecule's electron cloud to its end.
Due to this phenomenon water molecules act like little magnets that attract each other. The attraction of the molecules forms hydrogen bonds with each other. This is called cohesion (attraction of similar molecules). Due to this, water is able to create a surface tension that acts like a ‘skin’ and can support some weight (including its own weight) without collapsing.
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Answer:
Cohesion of water
Explanation:
cohesion means sticking together so Before it overflows, the water forms a dome-like shape(rounded) above the rim of the glass. This dome-like shape forms due to the water molecules' cohesive properties, or their tendency to stick to one another.
Draw the product of this reaction. Ignore inorganic byproducts.
H2/Lindlar's catalyst
The product of this reaction using inorganic by-products using H2/Lindlar's catalyst is cis-2-butene.
Lindlar's catalyst is Pd-BaSO4 which is used to convert alkynes to alkenes.It is done by using partial hydrogenation using special catalysts.In this process, hydrogen is added on the same side of the molecule which is known as syn addition.On the treatment of 2-butyne with hydrogen gas and Lindlar’s catalyst, the major product obtained is cis-2-butene.It is a heterogeneous catalyst made up of palladium consisting of palladium deposited on barium sulfate with traces of lead and quinoline.It is an addition type of reaction.To learn more about Lindler's catalyst visit:
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