Answer:
Alkaline Earth Metals
Explanation:
:)
11. When a plant is growing, coming into view that is known as:
A.Photosynthesis
B. Emergence
C.Xylem
D. Phloem
Answer:
B
............. M
Explanation:
Emergence
A student was titrating a solution of hydrazine (H. NNH) with a nitric acid solution. Determine the pH at a particular point in the titration. Do this by constructing a BCA table, constructing an ICE table, writing the equilibrium constant expression, and use this information to determine the pH
A student was titrating a solution of hydrazine with a nitric acid solution , the volume will be 50 ml and [HNO₃] in 50 ml solution = 0.020 M
Elaborating the given :Total Volume = 40 ml + 10 ml = 50 ml
[NH₂H₂N] in 50 ml solution = 0.200 M *40 ml / 50 lm
= 0.160 M
[HNO₃] in 50 ml solution = 0.100 M * 10 ml / 50 ml
= 0.020 M
a. ICE TableReaction NH₂H₂N H⁺ ⇄ NH₂H₂NH⁺
I 0.160 M 0.020 M -
C -0.020 M -0.020 M +0.020 M
E 0.140 M 0 0.020 M
b.
Reaction NH₂H₂N H₂O ⇄ NH₂H₂NH⁺ OH⁻
I 0.1400 M - 0.0200 M -
C ⁻x - ⁺x ⁺x
E 0.1400 -x 0.0200 +x x
c. Kb = [NH₂H₂NH⁺][OH⁻]/[NH₂H₂N]
Kb = [0.0200+x][x][0.1400 - x]
= 3.0 × 10⁻⁶
d. Because Kb is so small, the reaction will move insignificantly forward.
In either addition or substitution, x can be ignored.
[0.0200][x] / [0.1400 ]
= 3.0 × 10⁻⁶
=> x = 2.1 ×10⁻⁵ M = [OH-]
e. pOH = -log[OH⁻] = -log(2.1 ×10⁻⁵ )
= 4.68
pH = 14 -pH
= 14 - 4.68
= 9.32
Titrating a solution :
A titration is a method for determining the concentration of an unknown solution using a solution with a known concentration. Typically, the analyte (the unknown solution) is added to the titrant (the known solution) from a buret until the reaction is complete.
Incomplete question :
A student was titrating a solution of hydrazine (HNNH) with a nitric acid solution. Determine the pH at a particular point in the titration. Do this by constructing a BCA table, constructing an ICE table, writing the equilibrium constant expression, and use this information to determine the pH. Complete Parts 1-4 before submitting your answer. 1 2 3 4 NEXT > A 40.0 mL of 0.200 M HNNH, was titrated with 10 mL of 0.100 M HNO, (a strong acid). Fill in the ICE table with the appropriate value for each involved species to determine the moles of reactant and product after the reaction of the acid and base. You can ignore the amount of liquid water in the reaction. HNNH, (aq) + H+(aq) H,NNH,+(aq) Before (mol) Change (mol) After (mol) RESET 0 0.200 0.100 1.00 x 103 -1.00 x 103 2.00 x 109 -2.00 - 103 6.00 x 103 -6.00 x 10 7.00 x 10 -7.00 x 10 8.00 x 103 -8.00 x 103 A student was titrating a solution of hydrazine (HNNH) with a nitric acid solution. Determine the pH at a particular point in the titration. Do this by constructing a BCA table, constructing an ICE table, writing the equilibrium constant expression, and use this information to determine the pH. Complete Parts 1-4 before submitting your answer. < PREV 1 2 3 4 NEXT > Upon completion of the acid-base reaction, the H,NNH,+ ion is in equilibrium with water. Set up the ICE table in order to determine the unknown concentrations of reactants and products.. HNNH, (aq) H,O(1) OH(aq) + HNNH,+(aq) Initial (M) Change (M) Equilibrium (M) RESET 0 0.200 0.0200 0.100 0.140 0.175 +x -X 0.200 + x 0.200 - X 0.0200 + x 0.0200-X 0.100 + x 0.100 - x 0.140 + x 0.140 - x 0.175 + x 0.175 - x A student was titrating a solution of hydrazine (HNNH) with a nitric acid solution. Determine the pH at a particular point in the titration. Do this by constructing a BCA table, constructing an ICE table, writing the equilibrium constant expression, and use this information to determine the pH. Complete Parts 1-4 before submitting your answer. < PREV 1 2 3 4 NEXT > The Kb for HNNH, is 3.0 * 10º. Based on your ICE table and the equilibrium expression for kb, set up the expression for kb in order to determine the unknown concentrations. Each reaction participant must be represented by one tile. Do not combine terms. Кь = = 3.0 x 10-6 RESET [O] [0.200] [0.0200] [0.100] [0.140] [0.175) [x] [2x] [0.200 + x] [0.200 - x] [0.0200 + x] [0.0200 - x] [0.100 + x] [0.100 - x] [0.140 + x] [0.140 - x] [0.175 + x] [0.175 - x] A student was titrating a solution of hydrazine (HNNH) with a nitric acid solution. Determine the pH at a particular point in the titration. Do this by constructing a BCA table, constructing an ICE table, writing the equilibrium constant expression, and use this information to determine the pH. Complete Parts 1-4 before submitting your answer. PREV 1 2 3 4 < Based on your ICE table and the equilibrium expression for Kb, determine the pH of this solution.. pH = RESET 0 4.77 x 10-10 10.8 2.10 x 10% 4.68 9.32 3.22 0.140 1.70 12.3
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If air temperature decreases, then
wave height will decrease
ocean temperature will also decrease the same amount
ocean temperature will also decrease, but not as much
ocean temperature will also decrease, but a greater amount
wave height will increase
Answer:
ocean temp
Explanation:
If air temperature decreases, then wave height will decrease and ocean temperature will also decrease, but not as much.
What is ocean temperature ?The water's temperature at the surface is known as the ocean surface temperature. Depending on the measuring technique, the term "surface" might signify anything from 1 millimeter to 20 meters below the sea's surface.
Due to changes in solar radiation and the physical characteristics of water, the temperature of ocean water fluctuates depending on location, both in terms of latitude and depth.
Water contracts and gets denser as it cools. The density of water is influenced by temperature and salinity, and as a result, water moves up or down through the ocean's strata and circulates as currents.
Thus, option B is correct.
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What are the next 3 steps in the sequence? ◻◻◻◼◼⬤⬤⬤◯▲▲▲◻◻◻◼◼⬤⬤⬤◯▲
Answer:
Explanation:
2 triangles and on square
the atmospheric pressure on a mountain is 550 mmHg and 1 atm is equal to 760 mmHg. what is the pressure in atm? give your answer to 2 significant figures.
___ atm
Answer: 0.72
Explanation:
550 mmHg x 1 atm/ 760 mmHg = 0.72 atm
PLS ANSWER THIS FOR ME ILL GIVE BRAINLIEST
ok so pls watch episode 18 (Eureka Videos is the channel) and then answer all these
When molecules evaporate they are gaining enough _______ to break the forces of __________ holding them together. This might be compared to the popping of popcorn.
Why can't we see the vapour molecules that have escaped?.
How does increasing the heat affect the rate of molecules popping out into the vapour state?
The colder molecules get, the _________ they move
which of the following statements correctly describe the relative stabilities of resonance forms? select all that apply. multiple select question. a resonance structure with multiple bonds is always preferred to a resonance structure with only single bonds. a resonance structure with like charges on adjacent atoms is more stable than one with opposite charges on adjacent atoms. a resonance structure with formal charges closer to zero on individual atoms is preferred. a resonance structure is more stable if a negative charge resides on a more electronegative atom.
A resonance structure with formal charges closer to zero on individual atoms is preferred and resonance structure is more stable if a negative charge resides on a more electronegative atom.
Chemistry concept known as the theory of resonance that postulates that a molecule's actual normal state is represented by a combination of several alternative distinct structures rather than by a single valence-bond structure. The molecule is then said to have a structure that is a resonance hybrid of these structures or to resonate among the various valence-bond structures. The molecule is said to be stabilized by resonance when the calculated energy for a resonance hybrid is lower than the energies of any of the alternative structures. Resonance energy is the difference between the energies of any alternative structure and the energies of the resonance hybrid.
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A + 2 B + 4 C → products is known to be second order in A, first order in B and independent of the concentration of C. What is the value of the rate constant for this reaction if its rate is 0.783 M · s−1 when [A] = 5.00 M, [B] = 7.00 M, and [C] = 3.00 M? −2 −1 Answerinunitsof M ·s .
Answer:
4.47 × 10⁻³ M⁻² s⁻¹
Explanation:
Let's consider the following generic equation.
A + 2 B + 4 C → products
This reaction is known to be second order in A, first order in B and independent of the concentration of C (zero order in C). The rate law is:
rate = k × [A]² × [B] × [C]⁰
rate = k × [A]² × [B]
where k is the rate constant
When the rate is 0.783 M/s, [A] = 5.00 M, [B] = 7.00 M, and [C] = 3.00 M, the rate constant is:
k = rate / [A]² × [B]
k = 0.783 M/s / (5.00)² × (7.00) = 4.47 × 10⁻³ M⁻² s⁻¹
How many moles of mercury(II) oxide, HgO, are needed to produce 125 g of oxygen, O2? How many moles of mercury is produced?
Laughing gas (nitrous oxide, N2O) is sometimes used as an anesthetic in dentistry. It is produced when ammonium nitrate is decomposed according to the following reaction.
NH4NO3(s) ---> N2O(g) + H2O(l) How many grams of NH4NO3 are required to produce 33.0 g N2O? and How many grams of water are produced in this reaction?
Answer: 7.81 mol HgO (How many moles of mercury(II) oxide, HgO, are needed to produce 125 g of oxygen, O2?)
Explanation:
All of the following are recommended practices when lifting heavy objects except
All of the following are recommended practices when lifting heavy objects:
1. Keep your back straight and lift with your legs.
2. Get a good grip on the object before lifting it.
3. Keep the object close to your body.
4. Avoid twisting your body while lifting.
5. Take breaks if necessary.
The term that is not recommended when lifting heavy objects is twisting your body while lifting.
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Gadolinium (Gd) is element 64 on the periodic table. A sample contains 4.56×1022 atoms of Gd. What amount (mol) of Gd is present in a sample containing 4.56×1022 atoms?
Answer:
.757 moles of Gd is present in a sample containing 4.56x10^22 atoms of Gd.
Explanation:
Atoms --> Moles
1. Take the given number and put it over 1
(4.56x10^22 atoms/1)
2. Multiply by 6.022x10^23 to go from atoms to moles
(4.56x10^22 atoms/1) (1mol Gd/6.022x10^22 atoms)= .757223513...
3. Round by sigfigs
4.56 has three sigfigs
=.757 mols
Stacy made the following table to compare the functions of plant and animal structures, but she is missing a row title. Which of the following would best replace the X?
a table comparing the functions of different animal and plant structures. There is an unknown 'X' in the table. The skeleton in animals and the stem in plants provide support. The fur in animals and the waxy covering in plants provide protection. The ovaries in animals and the pistil in plants make 'X'
Answer:
female reproductive structures
PLEASEEEE HELP DUE IN 2 HOURSS PLEASE!! 15 POINTS!!!!Someone decides to swap out nitric acid (HNO3) for hydrogen
chloride (HCI), given that it will be much stronger due to opposing dipole
forces. Explain if they are correct or incorrect and why.
*
Explanation:
The claim that hydrogen chloride (HCl) would be much stronger than nitric acid (HNO3) due to opposing dipole forces is incorrect.
Both HCl and HNO3 are strong acids, meaning that they dissociate completely in water to produce H+ ions. The strength of an acid is determined by the degree to which it dissociates in water. In other words, the stronger the acid, the more H+ ions it produces in water.
The dissociation of HCl and HNO3 in water can be represented as follows:
HCl + H2O → H+ + Cl-
HNO3 + H2O → H+ + NO3-
As we can see, both HCl and HNO3 produce H+ ions in water. Therefore, the strength of an acid cannot be solely determined by its dipole forces.
In addition, it's important to note that HCl is a much more volatile and corrosive acid than HNO3. It can cause severe respiratory and skin irritation when it is inhaled or comes into contact with skin. Therefore, switching HNO3 for HCl could be dangerous and should not be done without proper precautions and expert knowledge
A chemist places a flask containing the reactants in an ice bath. this will _____ the rate of the reaction.
Placing a flask containing reactants in an ice bath will decrease the rate of the reaction.
This is because lowering the temperature slows down the kinetic energy and the movement of the particles involved in the reaction.
Temperature plays a crucial role in determining the rate of a chemical reaction. According to the kinetic molecular theory, at higher temperatures, the particles have more energy and move faster. This increased kinetic energy leads to more frequent and energetic collisions between the reactant molecules, promoting successful collisions that result in chemical reactions. Conversely, at lower temperatures, the particles have less energy and move more slowly, reducing the frequency and effectiveness of collisions.
When the flask is placed in an ice bath, the surrounding temperature decreases significantly. This causes the average kinetic energy of the particles in the reaction mixture to decrease. As a result, the particles move more sluggishly, making fewer collisions and decreasing the chance of effective collisions.
Additionally, the decrease in temperature affects the activation energy of the reaction. Activation energy is the minimum energy required for a reaction to occur. Lowering the temperature increases the energy barrier, making it more difficult for reactant molecules to reach the required energy threshold for successful collisions.
Therefore, by placing the flask in an ice bath and reducing the temperature, the rate of the reaction is slowed down. This cooling effect decreases the kinetic energy, lowers the frequency and effectiveness of collisions, and increases the activation energy barrier, all of which contribute to a decrease in the reaction rate.
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enter the expression for the solubility product for al(oh)3(s) in terms of the equilibrium concentrations of its dissolved ions in water.
The solubility product expression for Al(OH)3(s) in terms of the equilibrium concentrations of its dissolved ions in water is Ksp = [Al3+][OH-]^3.
This expression relates to the equilibrium state of the solid compound Al(OH)3 when it is dissolved in water. The concentration of the Al3+ ion and OH- ion in water determine the solubility product of Al(OH)3. If the concentration of the Al3+ ion or OH- ion increases, it will shift the equilibrium of the compound, resulting in more Al(OH)3 precipitating out of the solution.
If the concentration of either ion decreases, more of the compound will dissolve. Therefore, the solubility product expression provides a measure of the concentration of Al(OH)3 in water at equilibrium.
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what occurs when a soluble mineral receives water through precipitation, causing it to weaken?
When a soluble mineral receives water through precipitation, it can weaken and dissolve due to the chemical reactions that occur between the mineral and the water.
When a soluble mineral receives water through precipitation, it can cause it to weaken and dissolve. Precipitation is a natural process where water vapor in the atmosphere condenses into liquid form and falls to the ground as rain, snow, sleet, or hail. When this precipitation comes into contact with soluble minerals such as salt, calcium, or magnesium, it can dissolve and weaken the mineral's structure.
The amount of precipitation and the solubility of the mineral will determine the extent of the weakening process. Some minerals are more resistant to dissolution than others, and certain types of precipitation like acid rain can accelerate the process of dissolution. The weakening of minerals through precipitation can have significant impacts on the environment, including soil erosion, water quality degradation, and damage to infrastructure.
In summary, when a soluble mineral receives water through precipitation, it can weaken and dissolve due to the chemical reactions that occur between the mineral and the water. This can have significant environmental and infrastructural impacts and is an important consideration in many fields of study.
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What is the approximate total mass of the reactants, and how should it compare with the total mass of the products? Multiple choice question. a. 62 g, which should be less than the total mass of the products b. 62 g, which should equal the total mass of the products c. 372 g, which should be less than the total mass of the products d. 372 g, which should equal the total mass of the products
Answer:
b. 62 g, which should equal the total mass of the products
Explanation:
According to the law of conservation of mass, which states that mass of a substance can neither be created nor destroyed, hence, the mass of the reactants of a reaction must be equal to the mass of the products in that reaction.
As stated in this question, if the total mass of reactants is 62g, then, in accordance to the law of conservation of mass, the total mass of products should also be equal to 62g.
The gas in a sealed can is at a pressure of 7.42 atm at 25
∘
C. A warning on the can tells the user not to store the can in a place where the temperature will exceed 52
∘
C. What would the new gas pressure be at this temperature
At a temperature of 52∘C , the gas pressure in the can would be 8.11 atm.
What is gas pressure?
To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:
(P1V1)/T1 = (P2V2)/T2
where P1 is the initial pressure, V1 is the initial volume, T1 is the initial temperature, P2 is the final pressure (what we want to find), V2 is the final volume (which is assumed to be constant in this case), and T2 is the final temperature.
We can rearrange this equation to solve for P2:
P2 = (P1 x T2) / T1
Plugging in the given values, we get:
P2 = (7.42 atm x 325 K) / 298 K
where we convert the temperatures to Kelvin (25 degrees Celsius = 298 K, 52 degrees Celsius = 325 K).
Simplifying, we get:
P2 = 8.11 atm
Therefore, at a temperature of 52∘C, the gas pressure in the can would be 8.11 atm.
It's important to note that the warning on the can is due to the fact that as the temperature of the gas increases, so does its pressure. If the pressure gets too high, the can could potentially rupture or explode, which could be dangerous.
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Complete question is: The gas in a sealed can is at a pressure of 7.42 atm at 25∘C. A warning on the can tells the user not to store the can in a place where the temperature will exceed 52∘C. the new gas pressure in the can would be 8.11 atm.
BALANCEAR ECUACIONE
H2SO4 + Ba(OH)2 = BASO4 + H2O
Answer:
H2SO4 + Ba(OH)2 = BaSO4 + 2H2o
Explanation:
what is ne in the simulation?
The number of people (or adults) in the population, N, has an evolutionary equivalent called Ne. whereas N determines the ecological effects of population size simulation,
Evolutionary consequences (rates of genetic diversity loss and increase in inbreeding; relative effectiveness of selection) depend on Ne, and Emergency Medical Care Providers in Critical Access Hospitals and ambulance services across the entire state receive technologically advanced simulation training.Ne=(4*Nm*Nf)/(Nm+Nf) is the formula to get the effective population size. The formula Ne = 4NmNf/(Nm + Nf) can be used to calculate the effective population size in this circumstance, where Nm and Nf are the number of men and females, respectively. demonstrates the connection between Ne and Nf in a population of 1,000 reproducing people simulation.
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Can someone please help me it's urgent!
Write a statement about each pair of lines in this construction. (3 statements)
Answer:
I don't know
Explanation:
I'm sorry I didn't learn this in my life,I have never reach in this level
96. Phosphorus (P4) is commercially prepared by heating a mixture of calcium phosphate (Ca3(PO4)2), sand (SiO₂), and coke (C) in an electric furnace. The process involves
two reactions.
2Ca3(PO4)2(s) + 6SiO₂ (s)→ 6CaSiO3 (1) + P4O10(g)
P4010(g) +10C(s) → P4(g) + 10CO(g)
The P40 10 produced in the first reaction reacts with an excess of coke (C) in the second reaction. Determine the theoretical yield of P4 if 250.0 g of Ca3(PO4)2 and 400.0 g of SiO₂ are heated. If the actual yield of P4 is 45.0 g,
determine the percent yield of P4.
Percent yield is defined as the 100 times the ratio of actual yield and theoretical yield. It ca be calculated by finding theoretical yield of the reaction and come as 76.6%.
2Ca₃(PO₄)₂(s) + 6SiO₂(s) → 6CaSiO₃(l) + P₄O₁₀(g)
P₄O₁₀(g) + 10C(s) → P₄(g) + 10CO(g)
We need to find out the moles of Ca₃(PO₄)₂ and SiO₂ to find limiting reactant. With the help of limiting reactant we can find moles of P₄O₁₀ = Moles of P₄. We must convert moles of P₄ to mass using Molar mass (P₄ = 123.895g/mol):
Moles Ca₃(PO₄)₂ -Molar mass: 310.1767g/mol-
293.5g (1mol / 310.1767g) = 0.9462moles
Moles SiO₂ -Molar mass: 60.08g/mol-:
378.5g (1mol / 60.08g) = 6.30 moles
For the complete reaction of 6.30 moles of SiO₂ there are required:
6.30 moles SiO₂ (2 moles Ca₃(PO₄)₂ / 6 moles SiO₂) =
2.10 moles Ca₃(PO₄)₂. Now there are just 0.9462 moles, Ca₃(PO₄)₂ is limiting reactant
Moles of P₄O₁₀ = Moles P₄:
0.9462moles of Ca₃(PO₄)₂ (1mol P₄O₁₀ / 2 mol Ca₃(PO₄)₂)
= 0.4731 moles of P₄O₁₀ = Moles P₄.
The mass is calculated as:
0.4731 moles P₄ (123.895g / 1mol) = 58.6g = Theoretical yield.
Thus, Percent yield is calculated as:
44.9g / 58.6g ×100 = 76.6%
So, 76.6% is percent yield of P₄
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Q7. Aluminum is extracted from the ore bauxite, which is impure aluminum oxide. 1 tonne (1000 kg) of the ore was found to have this composition: 1. aluminum oxide 825 kg 2.iron(III) oxide 100 kg 3.sand 75 kg
(a): What percentage of this ore is impurities?
(b): 1 tonne of the ore gives 437 kg of aluminum.
(i): How much aluminum will be obtained from 5 tonnes of the ore?
(ii): What mass of sand is in this 5 tonnes?
(c): What will the percentage of aluminum oxide in the ore be, if all the iron (III) oxide is removed, leaving only the aluminum oxide and sand?
Answer:
(a) Total impurities = 17.5%
(b)
(i) 5 tons of ore yields 2185 kg of aluminium
(ii) 5 tons of ore contains 375 kg of sand
(c) Percentage of Al2O3 in purified ore = 825/900 = 91.7%
Explanation:
Q7. Aluminum is extracted from the ore bauxite, which is impure aluminum oxide.
1 tonne (1000 kg) of the ore was found to have this composition:
1. aluminum oxide 825 kg (82.5%)
2.iron(III) oxide 100 kg (10%)
3.sand 75 kg (7.5%)
(a) Since we are interested only in extracted aluminium, everything other than aluminium oxide is considered impurity, which includes Fe2O3 (10%) and sand (7.5%). Total impurities = 10+7.5 = 17.5%
(b) "1 tonne of the ore gives 437 kg of aluminum."
(i) 1 ton of ore : 437 kg Al = 5 tons of ore : x kg of Al
Cross multiply
x = 5 tons * 437 kg / 1 ton = 2185 kg of aluminium
(ii) 1 ton of ore contains 75 kg of sand
5 tons of or contains x kg
x = 5*75/1 = 375 kg of sand
(c) If the ore is purified from Fe2O3, then for each ton of ore, there will be left
825 kg of aluminium oxide,
75 kg of sand
for a total of 900 kg.
Percentage of Al2O3 = 825/900 = 91.7%
Answer:
A) 17.5 %
B) 1) 2135 kg
2) 375 kg
C) 91.8%
Explanation:
Part (A):
1 tonne = 1000 kg = 100%
Aluminium oxide = 825 kg = 82.5%
Iron (III) oxide = 100 kg = 10%
Sand = 75 kg = 7.5%
That makes total of 100%
So, the percentage of impurities = Iron (III) oxide + Sand
=> 10 + 7.5 = 17.5%
Part (B):
(1) 1 tonne = 427 kg
Multiplying both sides by 5
=> 5 tonne = 427 * 5
=> 5 tonnes = 2135 kg
(2) 1 tonne contains 75 kg sand as impurity
=> 1 tonne = 75 kg
Multiplying both sides by 5
=> 5 tonnes = 75*5
=> 5 tonnes = 375 kg
Part (C):
If all of the iron oxide was removed, then only aluminium and sand are left.
Aluminium = 825 kg
Sand = 74 kg
Total of them makes it:
=> 825 + 74 = 899
So,
%age of Aluminium = \(\frac{825}{899} * 100\)
%age of Aluminium = 0.918 * 100%
%age of Aluminium = 91.8%
can you identify an atom without knowing number of neutrons in it?
Answer:
yes
Explanation:
to identify an atom you need to know either it's atomic number or it's proton number
while the neutron is used to determine it's atomic mass
What is the volume of 34. 6 mol O2 at 2. 5 atm and 30 oC?
The answer is is approximately 344.16 L.
To find the volume of 34.6 mol O2 at 2.5 atm and 30°C, we can use the Ideal Gas Law equation: PV = nRT.
In this equation:
P = pressure (2.5 atm)
V = volume (which we need to find)
n = moles of gas (34.6 mol O2)
R = ideal gas constant (0.0821 L atm/mol K)
T = temperature in Kelvin (30°C + 273.15 = 303.15 K)
Rearrange the equation to solve for V: V = nRT / P
Now, plug in the values: V = (34.6 mol)(0.0821 L atm/mol K)(303.15 K) / (2.5 atm)
Calculate the volume: V ≈ 344.16 L
The volume of 34.6 mol O2 at 2.5 atm and 30°C is approximately 344.16 L.
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1. Fill in the blanks.
a. Breathing is a combined form of______and_______.
b. Oxygen is absorbed by diffusion from______of the lungs.
c. Plants take______gas for respiration. d. Plants have______and______for respiration.
e. Plants have_______and_______for transportation.
Respiration deals with the gaseous exchange that occur between the individuals and the environment.
What is respiration?The term respiration deals with the gaseous exchange that occur between the individuals and the environment. The individuals take in a gas from the environment and pass out a gas to the environment. This is the way in which the balance of the universe is maintained.
Now, plants take in carbon dioxide and give out oxygen whereas animals take in oxygen and give out carbon dioxide. By so doing, the delicate carbon - oxygen balance in nature is maintained unless it is upturned by anthropogenic activities.
The following fill in the blanks as requested in the question;
a) Inhalation and exhalation'
b) trachea
c) carbon dioxide
d) leaves and stomata
e) xylem and phloem
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Answer:
a) inhalation and exhalation
b) trachea
c) carbon dioxide
d) leaves and stomata
e) xylem and phloem
what is the bulk density of a dry soil sample with a
mass of 30 g that complely occupies a cylinder 6cm high and 4 cm in
diameter?
Answer:
397,570 g/m^3
Explanation:
The volume of the cylinder can be calculated using its height and diameter.
Mass of the soil sample (m) = 30 g
Height of the cylinder (h) = 6 cm
Diameter of the cylinder (d) = 4 cm
First, we need to calculate the radius (r) of the cylinder
Radius (r) = diameter / 2 = 4 cm / 2 = 2 cm = 0.02 m
Now, we can calculate the volume (V) of the cylinder
V = π * r^2 * h
V = 3.14159 * (0.02 m)^2 * 0.06 m
V = 7.5398 E-5 m^3
Calculate the bulk density (ρ) using this formula
ρ = m / V
ρ = 30 g / 7.5398 E-5 m^3
ρ = 397,887 g/m^3
There are TWO isotopes of chlorine. Under normal conditions, chlorine exists as diatomic molecule, Cl₂. The mass of the Cl₂ molecule is the sum of masses of the two atoms in the molecule. The mass spectrum of Cl₂ has three peaks, as shown below. From this data, what is the mass of the heavier isotope of chlorine (in amu)?
Peak 1- 69.938 amu
Peak 2- 71.935 amu
Peak 3- 73.932 amu
The the mass of the heavier isotope of chlorine (in amu) is 73.932 amu.
What are isotopes?The term isotopes refers atoms that have the same atomic number but different mass number. We must know that all these atoms belong to the same element an differ only in the number of neutrons present in the atom of the element. Hence isotopes are different atoms of the same element hence they have the same chemical properties or reactivity. The mass spectrum is able to show the masses of each of the isotopes according to their order of relative abundance in nature.
Looking at the peaks, we know that the heaviest isotope is the one whose mass will have the highest peak as shown in the mass spectrum of the element as shown. Thus, the the mass of the heavier isotope of chlorine (in amu) is 73.932 amu. The mass spectrum of element also shows this fact.
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The BrO3- ion is named bromate. What is the name of the oxoacid with the formula HBrO3?
The \(BrO_3^-\) ion is named bromate, which is an anion derived from the oxoacid \(HBrO_3\). The name of the oxoacid \(HBrO_3\) is bromic acid.
Here's the breakdown of the terms:
- Ion: An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
- Bromate: The \(BrO_3^-\) ion, an anion containing bromine and oxygen.
- Oxoacid: An acid containing oxygen, along with another element and hydrogen.
The hydrogen atom is bonded to one of the oxygen atoms via a single covalent bond. This makes the bromic acid a member of the oxoacid family, which consists of acids that contain oxygen and hydrogen atoms.
So,\(HBrO_3\) is an oxoacid with the bromate ion (\(BrO_3^-\)) and hydrogen (H⁺), and its name is bromic acid.
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When H+ forms a Bond with H2O to form the Hydronium ion H3 plus this bond is called a coordinate covalent bond because
Answer:
Because both the bonding electrons come from the oxygen atom. Explanation: A coordinate covalent bond is formed when both the bonding electrons are coming from the same atom
Explanation: