Answer:
A physicist
Explanation:
Physics is that aspect of science that deals with nature and matter in relation to energy. Electricity is a source for energy
how do scientists believe that chloroplasts got into photosynthetic cells?
The development of chloroplast is thought to occur through endosymbiosis.
According to the endosymbiosis, some of the organelles found in modern eukaryotic cells, such as mitochondria and chloroplasts, were previously prokaryotic microorganisms. A non-photosynthetic creature acquired one photosynthetic cell, and the chloroplast was subsequently created.
An organelle known as a chloroplast is crucial to the process of photosynthesis in plants. It contains pigments like chlorophyll and other pigments that are in charge of capturing sunlight. Since each chloroplast has two membranes, other organelles such as mitochondria are referred to as double-membrane organelles. It is believed that cyanobacterial endosymbiosis played a role in the genesis of the chloroplast. Prokaryotic organisms like cyanobacteria have the capacity to prepare their food through the process of photosynthesis.
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Answer:what’s the answerr
Explanation:
For which of the following reactions is S° > 0.
Choose all that apply.
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g)
2CO2(g) + N2(g) ---->2CO(g) + 2NO(g)
2N2(g) + O2(g) -----> 2N2O(g)
S(s,rhombic) + 2CO(g) ----> SO2(g) + 2C(s,graphite)
NH4Cl(s) ----> NH3(g) + HCl(g)
The entropy of the given reactions increases (S° > 0):
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g) ---> S° > 0.NH4Cl(s) ----> NH3(g) + HCl(g) ---> S° > 0.What is entropy?
Entropy measure how disordered a system is. It a measure of how dispersed or random the total energy of a system is. The symbol for entropy is S.
A system in which entropy increases is one in which S° > 0.
The entropy of a system decreases when S° < 0.
Entropy of a system increases (S° > 0) if any change results in an increase in temperature, increase in number of molecules, or an increase in volume.
Considering the given systems, the entropy changes is as follows:
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g) ---> S° > 0.2CO2(g) + N2(g) ---->2CO(g) + 2NO(g) --> no change2N2(g) + O2(g) -----> 2N2O(g) ---> decreasesS (s,rhombic) + 2CO(g) ----> SO2(g) + 2C (s,graphite) ---> no changeNH4Cl(s) ----> NH3(g) + HCl(g) ---> S° > 0.In conclusion, an increase in volume and moles of substances results in entropy increase.
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Determine the acid dissociation constant (Ka) for a 0.200 M solution of hydrogen sulfate ion with
the pH of 1.35 if the reaction for the dissociation of this acid is
HSO 4 →→ H+ + SO 4-²
(Hint: [H+] = 10-PH; Ka = [product]/[reactant])
The acid dissociation constant(Ka) is 0.0095
The reaction for this dissociation of acid is
HSO4 ⇄H+ + SO4 -2
The dissociation constant can be determined from the following expression
[tex]Ka= \frac{[H+] [SO4]-2}{[HSO4}[/tex]
[H+] = 10-PH
= 10-1.35
[H+] = 0.0447
[H+] = 0.0447 mol / L
From equation, [H+] = [SO4-2] = 0.0447 mol / L
[SO4-2] = 0.0447 mol / L
From the values of [H+], [SO4-2] and [HSO4] Ka can be calculated as follows,
Ka = 0.0447 * 0.0447 / 0.200
= 0.0019 / 0.200
= 0.0095
Hence the value of the acid dissociation constant (Ka) for the given reaction is 0.0095
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What is the chemical symbol of the terminal atom in the lewis structure of OH- ?
Answer:
kindly refer to the picture attached
Explanation:
Have a great day . keep smiling
Solve the following question
Answer:
140. J/g*K
Explanation:
To find the specific heat capacity, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy/heat (J)
-----> m = mass (g)
-----> c = specific heat (J/mole*K)
-----> ΔT = change in temperature (K)
Before you can use the equation above, you need to (1) convert kg to grams, then (2) convert grams to moles (via molar mass), and then (3) convert Celsius to Kelvin. The final answer should have 3 significant figures.
1.11 kg C₄H₈O₂ x 1,000 = 1110 g
Molar Mass (C₄H₈O₂): 4(12.01 g/mol) + 8(1.008 g/mol) + 2(16.00 g/mol)
Molar Mass (C₄H₈O₂): 88.104 g/mol
1110 grams C₄H₈O₂ 1 mole
------------------------------ x ------------------------- = 12.6 moles C₄H₈O₂
88.104 grams
34.5 °C + 273 = 307.5 K
52.3 °C + 273 = 325.3 K
Q = mcΔT <----- Equation
3.14 x 10⁴ J = (12.6 moles)c(325.3 K - 307.5 K) <----- Insert values
3.14 x 10⁴ J = (12.6 moles)c(17.8) <----- Subtract
3.14 x 10⁴ J = (224.28)c <----- Multiply 12.6 and 17.8
140. = c <----- Divide both sides by 224.28
**this answer may be slightly off due to using different molar masses/Kelvin conversions**
72
Anteaters have very long noses that are adapted to help them survive. Although they have poor eyesight,
anteaters have an excellent sense of smell that helps them detect their surroundings. Anteaters are also good
swimmers and can use their noses like a snorkel held above the water.
How does an anteater's nose help it meet its needs?
A
Its nose can be used to fight off predators.
B
C
D
Its nose can be used as a paddle to help it swim.
Its sticky tongue can quickly catch insects to eat.
Its powerful sense of smell helps it find insects to eat.
Answer:
Its powerful sense of smell helps it find insects to eat.
How many grams of Nitrogen gas are found in 22.4 L of Nitrogen gas?
Group of answer choices
A. 20 g
B. 14 g
C. 56 g
D. 28 g
Answer:
The answer is 28 gram.
28 gram of Nitrogen gas are found in 22.4 l in Nitrogen gas
What are the component of black powder and why are they needed to cause an explosion
Hi There!
Black powder is an explosive powder consisting of saltpeter, sulfur, and charcoal, used chiefly in old guns fired for sport, in fireworks, and for spotting charges in practice bombs; black gunpowder.
In addition to being easily ignited by friction and impact, black powder is also extremely sensitive to flame and spark. It ignites violently when unconstrained and explodes when lit in even the slightest amount of confinement.
Thank you,
Eddie
Based upon the ion charge of the following polyatomic ions, predict the formula for the following compounds.
sulfate = SO42
phosphate = PO43
hydroxide OH-
sodium hydroxide
O Na(OH)2
O Na(OH)3
O Na₂OH
O NaOH
Answer:
D.) NaOH
Explanation:
Sodium always forms the cation, Na⁺.
Hydroxide is always written as OH⁻.
The compound should have an overall charge of 0 (be neutral). As you can see, the charges perfectly balance out (+1 + (-1) = 0). Therefore, there only needs to be one atom of each ion. The ionic compound is thus NaOH.
The empirical formula for a compound is C3H3O its molecular mass 110 what is its molecular formula
Answer:
C6H6O2
Explanation:
Total mass of empirical =55
Total mass of compound is 110. So you need to multiply each atims by 2
Which of the following statements is correct?
Question 12 options:
In an acidic solution, [H+] > [OH-].
In a basic solution, [OH-] > [H+] .
In a neutral solution, [H+] = [OH-] .
All of the above statements are correct.
Answer:
All of the above statements are correct.
Explanation:
acid is a substance that acts as a proton donor, so will have more H+ ions;
basic/alkaline substances act as a proton acceptor, so will have more OH- ions according to bronsted lowry theory
and no to mention neutral means balanced so will have balanced concentration of ions to cancel their charges out.
The value of gravitational acceleration of a body on earth is 9.8 meters/second 2 power. The gravitational energy for a 1.00 kg object is found to be 12.5 joules. How high is the ground level, where KE = 0
Answer:
I don't know what the hell is going on with the this.
Which of the following ionic formulas is INCORRECT?
a) K₂O
b) Fe₂(SO4)_3
c) CUPO4
d) (NH4)_2S
e) CaBr₂
Answer:
c) CuPO₄
Explanation:
Copper commonly forms the cation Cu²⁺.
Phosphate is a polyatomic anion which can be represented by PO₄³⁻.
In order to have proper charge balance (an overall charge of 0), there must be three copper cations and two phosphate anions within the compound. As such, the correct ionic formula is Cu₃(PO₄)₂.
In a calorimetry experiment 2.50 g of methane is burnt in excess oxygen. 30% of the
energy released during the combustion is absorbed by 500 g of water, the temperature of
which rises from 25°C to 68°C. The specific heat capacity of water is 4.184 J/g°C. What
is the total energy released per gram of methane burnt?
The total energy released per gram of methane in the experiment is 119941.33 J/g
How to determine the change in the temperature of waterInitial temperature of water (T₁) = 25 °CFinal temperature of water (T₂) = 68 °CChange in temperature (ΔT) = ?Change in temperature (ΔT) = T₂ – T₁
Change in temperature (ΔT) = 68 – 25
Change in temperature (ΔT) = 43 °C
How to determine the heat absorbed by the waterThe absorbed by the water can be obtained as illustrated below:
Mass of water (M) = s00 gChange in temperature (ΔT) = 43 °C Specific heat capacity of the water (C) = 4.184 J/gºC Heat (Q) =?Q = MCΔT
Q = 500 × 4.184 × 43
Q = 89956 J
How to determine the energy released by methane in the experimentHeat absorbed by water = 89956 JPercentage of heat absorbed by water = 30%Heat released by methane =?Heat absorbed by water = 30% of heat released by methane
89956 = 30% × heat released by methane
89956 = 0.3 × heat released by methane
Divide both sides by 0.3
Heat released by methane = 89956 / 0.3
Heat released by methane = 299853.33 J
How to determine the heat released per gram of methaneHeat released by methane (Q) = 299853.33 JMass of methane (m) = 2.5 gHeat per gram (ΔH) =?Q = m × ΔH
Divide both sides by m
ΔH = Q / m
ΔH = 299853.33 / 2.5
ΔH =119941.33 J/g
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Consider the following reaction at 298 K.
Which of the following statements are correct?
From the calculation, the correct statements are;
n = 2 mol of electronsK < 1What are the true statements?Now we know that it is possible to obtain the equilibrium constant from the relation;
E°cell = 0.0592/n log K
E°cell = cell potential = -0.403 - 0.535 = -0.938 V
n = number of electrons = 2 electrons
K = equilibrium constant
Thus;
-0.938 = 0.0592/2 logK
-0.938 * 2/ 0.0592 = log K
K = 2 * 10^-31
ΔG = - nFE°cell
ΔG = - (2 * 96500 * -0.938)
ΔG = 181kJ/mol
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Kendra knew from science class that water freezes at 0°C. She started to wonder
about the freezing points of other clear liquids. She decided to conduct an
experiment using vinegar, rubbing alcohol, and bleach. She pours 50 mL of each
liquid into three plastic containers that are all the same. She puts them in the freezer
at the same time and places the same brand thermometer in each liquid. Kendra
checks the temperatures every ten minutes and records her observations in her
journal.
Independent Variable:
Dependent Variable:
Three Control Variables:
YesYes , the water freezes at 0°C and every substance has it's own freezing points.
What is Freezing point ?The temperature at which a liquid solidify.The temperature at which the liquid and solid substance are in equilibrium at atmospheric pressure: melting point of water is 0°Celsius or 32°Farenhiet.
The freezing point of alcohol will be -114°C .
The freezing point of Bleach will be 19°F .
The Freezing point of vinegar will be 28°F .
The freezing point of rubbing alcohol will be- 100°C .
So,every substance has it's own freezing point.
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The isotope sodium-24 has a half-life of 15 hours. Starting with 22 grams, how much remains in 30
hours?
Answer:
5.5 grams
Explanation:
To find how much of the isotope remains, you need to use the half-life equation:
[tex]N(t) = N_0(\frac{1}{2})^\frac{t}{h}[/tex]
In this equation,
-----> N(t) = remaining mass (g)
-----> N₀ = initial mass (g)
-----> t = time (hrs)
-----> h = half-life (hrs)
You can find the remaining mass by plugging the given values into the equation and solving.
N(t) = ? g t = 30 hrs
N₀ = 22 g h = 15 hrs
[tex]N(t) = N_0(\frac{1}{2})^\frac{t}{h}[/tex] <----- Half-life equation
[tex]N(30) = (22)(\frac{1}{2})^\frac{30}{15}[/tex] <----- Insert values
[tex]N(30) = (22)(\frac{1}{2})^2[/tex] <----- Simplify exponent
[tex]N(30) = (22)(0.25)[/tex] <----- Solve [tex](\frac{1}{2} )^2[/tex]
[tex]N(30) = 5.5[/tex] <----- Multiply 22 and 0.25
If a thermometer reads 17° C, what is the temperature in Fahrenheit?
Answer:
62.6
Explanation:
formula = (°C x 9/5) + 32
(17°C x 9/5) + 32
30.6 + 32
62.6
How many ml of 3M NaOH would it take to neutralize 120ml of 1M HCL?
Answer:
30ml
Explanation:
the acid-base solution just begins to turn pink and the pH reaches 7, indicating that the base has neutralized the acid. By reading the buret, it is found that 30 ml of NaOH was needed to neutralize the HCl.
Please help me with this reaction
The major product from the above organic reaction is I
In this reaction, methoxy ethane undergoes addition reaction with hydrogen bromide, Markownikoff's rule being involved in the reaction.
What are organic compounds?Organic compounds are the compounds which contains carbon and hydrogen.
Generally, organic compounds are characterized by the following:
All organic compounds contains carbon Organic compounds are also combustible in nature They are mostly covalent bonded molecules They are all soluble in non-polar solvents.They can be isolatedThey can also be prepared in the laboratoryBelow are some classes of organic compounds:
AlkanesAlkenesAlkynesAlkanolsAlkanoic acidAlkanalsEstersKetonesAminesSo therefore, the major product from the the above organic reaction is IV
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What is the average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing
with X-rays?
OA. 40 uSv
OB. 1000 u Sv
OC. 2400 u Sv
OD. 100,000 u Sv
C. The average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv.
What is x-ray?
X-rays are a form of electromagnetic radiation, similar to visible light used for medical treatment and other forms of x ray inspection.
An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation.
The average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv or 2.4 m u Sv.
Thus, the average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv.
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The value of the entropy change for the process N₂ (g) + 3H₂ (g) --> 2NH₃ (g) is ________.
positive
unchanged
zero
negative
Answer:
negative
Explanation:
Entropy is a measure of the "disorder" in a system.
In this reaction, the amount of disorder decreases. This is because one gas molecule (NH₃) has more order than two gas molecules (N₂ and H₂). Therefore, the entropy change should be negative.
Question 6(Multiple Choice Worth 5 points)
(08.01 LC)
Which of the following is a property of water?
It can freeze very fast.
OIt has low heat capacity.
It exists in all three states on Earth.
It repels other water molecules.
The property of water is that It exists in all three states on Earth.
The major residences to be able to be mentioned in this text are its appeal to polar molecules, its high specific warmth, the excessive warmness of vaporization, the decrease density of ice, and its high polarity.
The primary homes of water are its polarity, concord, adhesion, floor anxiety, excessive unique warmth, and evaporative cooling. A water molecule is barely charged on each ends. this is because oxygen is more electronegative than hydrogen.
Water is good sized functionality to dissolve a ramification of molecules has earned it the designation of “standard solvent,” and it's far this capacity that makes water such an invaluable life-sustaining pressure. On a biological level, water's role as a solvent facilitates cells transport and use substances like oxygen or vitamins.
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How many moles of Hydrogen gas will be produced if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid given the following balanced chemical reaction:
Mg + 2HCl → MgCl2 + H2
Group of answer choices
A. 1.25 moles
B. 5.0 Moles
C. 7.5 moles
D. 2.5 moles
Taking into account the reaction stoichiometry, 1.25 grams of H₂ (option A) are formed if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid.
Reaction stoichiometryIn first place, the balanced reaction is:
Mg + 2 HCl → MgCl₂ + H₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Mg: 1 mole HCl: 2 molesMgCl₂: 1 moleH₂: 1 moleMass of hydrogen formedThe following rule of three can be applied: if by reaction stoichiometry 2 moles of Mg form 1 mole of H₂, 2.5 moles of Mg form how many moles of H₂?
[tex]moles of H_{2} =\frac{2.5 moles of Mgx1 mole of H_{2} }{2 moles of Mg}[/tex]
moles of H₂= 1.25 moles
Finally, 1.25 grams of H₂ (option A) are formed if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid.
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Determine which elements or compounds are reactants in the following equation calcium + chlorine = calcium chloride
Answer:
See below
Explanation:
Calcium and chlorine are the reactants ..... they 'react' in a chemical reaction to form the compound calcium chloride .
How many grams of water will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen given the following balanced chemical equation?
2H2 + O2 → 2H2O
Group of answer choices
A. 32.0 grams
B. 36.0 grams
C. 54.0 grams
D. 18.0 grams
Taking into account the reaction stoichiometry, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.
Reaction stoichiometryIn first place, the balanced reaction is:
2 H₂+ O₂ → 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂: 2 moles O₂: 1 moleH₂O: 2 molesThe molar mass of the compounds is:
H₂: 2 g/moleO₂: 32 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
H₂: 2 mole× 2 g/mole= 4 gramsO₂: 1 mole× 32 g/mole= 32 gramsH₂O: 2 moles× 18 g/mole= 36 gramsMass of H₂O formedYou can see that by reaction stoichiometry 4 grams of H₂ form 36 grams of H₂O.
SummaryIn summary, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.
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Calculate the volume in litres (L) of 1.41 mol of gas at 68.0 kPa and 27.00 °C (gas constant R = 8.314 J mol K-.).
1. 664 L
2. 0.384L
3. 51.7L
4. 4.66L
5. 0.511L
Answer:
3.) 51.7 L
Explanation:
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In the equation,
-----> P = pressure (kPa)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (8.314 kPa*L/mol*K)
-----> T = temperature (K)
First, you need to convert the temperature from Celsius to Kelvin. Then, you can plug the given values into the equation and simplify to find "V".
P = 68.0 kPa R = 8.314 kPa*L/mol*K
V = ? L T = 27.00 °C + 273 = 300 K
n = 1.41 moles
PV = nRT <----- Ideal Gas Law
(68.0 kPa)V = (1.41 moles)(8.314 kPa*L/mol*K)(300 K) <----- Insert values
(68.0 kPa)V = 3516.822 <----- Multiply right side
V = 51.7 <----- Divide both sides by 68.0
Determine the mass % of a NaCl solution if 58.5 grams of NaCl was dissolved in 50 ml of water (assume the density of water to be 1 g/ml). [5]
Considering the definition of percentage by mass and density, the percentage by mass of a NaCl solution is 53.917%.
Percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]percentage by mass= \frac{mass of solute}{mass of solution}x100[/tex]
DensityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
Percentage by mass of a NaCl solutionIn this case, you know:
mass of solute= 58.5 gramsvolume of water= 50 mLdensity of water= 1 [tex]\frac{g}{mL}[/tex]mass of solution= mass of solute + mass of waterReplacing in the definition of density, you get the mass of water:
[tex]1 \frac{g}{mL} =\frac{mass of water}{50 mL}[/tex]
Solving:
mass of water= 1 [tex]\frac{g}{mL}[/tex]× 50 mL
mass of water= 50 grams
Then, you get that the mass of solution is calculated as:
mass of solution= mass of solute + mass of water
mass of solution= 58.5 grams + 50 grams
mass of solution= 108.5 grams
So, the percentage by mass is calculated as:
[tex]percentage by mass= \frac{58.5 grams}{108.5 grams}x100[/tex]
percentage by mass= 53.917%
Finally, the percentage by mass of a NaCl solution is 53.917%.
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I need help I feel like it might be wrong thanks
Answer:
No it's correct.
Explanation:
The water temperature is 25 degrees Celsius. it's rigHT.
How do chemical reactions differ from nuclear reactions? (2 points) Chemical reactions involve electrons and protons, and nuclear reactions only involve protons. Chemical reactions involve changes in bonding, and nuclear reactions involve changes in an atom's nucleus. Chemical reactions involve forming bonds, and nuclear reactions involve breaking bonds. Chemical reactions involve sharing of electrons, and nuclear reactions involve the formation of ions.
Nuclear reactions include a change in the nucleus of an atom, which typically results in the production of a new element. Contrarily, chemical reactions only require the rearrangement of electrons and do not affect the nuclei; rather, they entail changes in bonding.
What is a nuclear reaction & a chemical reaction?
Nuclear fission or fusion processes were necessary for the synthesis of elements (decay). Atomic atoms' nuclei are the site of nuclear reactions, as the name suggests.Outside the atom's nucleus, in the electron cloud, chemical processes take to occur. The electromagnetic force is present during chemical processes. An atom's s and p subshells are where most chemical reactions take place. Valence electrons are those located in the outermost s and p subshells.Most of the operations we are acquainted with are powered by chemical reactions, including food digestion, and the conversion of carbohydrates into energy. Chemical processes lack the energy of nuclear reactions. In the atomic core, protons and neutrons participate in nuclear processes. Electrons orbit the nucleus during chemical reactions.Therefore it is concluded that option (B) is correct.
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