Answer:
B
Explanation:The poisonous substances, present in the environment can easily get into the trophic level as living organism depends on each other and environment for food and nutrition. These poisonous substances may not be broken down in the body or excreted easily, efficiently and quickly. Instead, they accumulate in the tissues, and as the living organism eats more, the concentration of these substances increases and they pass from one trophic level to the next. The tertiary consumer being at the top of trophic levels receives the maximum pollutant. This phenomenon is known as biological magnification.
So, the correct answer is option B.
12. Which organelle is found in plant and animal cells and is involved in making cellular energy from
respiration?
Answer:
The mitochondria is the organelle found in plant and animal cells and is involved in making cellular energy from respiration.
Explanation:
Can you help with question 8
Answer:
pH = 9.4
Explanation:
With the given molarity of OH⁻ species we can calculate the pOH of the solution:
pOH = -log[OH⁻]
pOH = 2.6
Now we can use the pOH to calculate the pH of the solution, with the following formula:
pH = 14 - pOH
pH = 14 - 2.6
pH = 9.4
So a solution containing a OH⁻ concentration of 0.0025 M has a pH of 9.4.
A 200 milliliter sample of gas has a pressure of 1 atmosphere. If the volume of the gas is decreased to 50 milliliters at constant temperature, the new pressure of the gas will be
1) 4 atm
2) 1 atm
3) 3 atm
4) 2 atm
Answer:
Answer is - 2. ...........
At constant temperature, if the volume of the sample of gas decreases, the pressure increases to 4.0atm.
Hence, option1)4 atm is the correct answer.
What is Boyle's law?Boyle's law simply states that "the volume of any given quantity of gas is inversely proportional to its pressure as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given the data in the question question;
Initial volume of the gas V₁ = 200mL = 0.2LInitial pressure of the gas P₁ = 1.0atmFinal volume of the gas V₂ = 50.mL = 0.05LFinal pressure of the gas P₂ = ?We substitute our given values into the expression above to determine the new pressure.
P₁V₁ = P₂V₂
P₂ = P₁V₁ / V₂
P₂ = ( 1.0atm × 0.2L ) / 0.05L
P₂ = 0.2Latm / 0.05L
P₂ = 4atm
At constant temperature, if the volume of the sample of gas decreases, the pressure increases to 4.0atm.
Hence, option1)4 atm is the correct answer.
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A student placed a small piece of magnesium ribbon in a conical flask and added
60 mL hydrochloric acid. The student observed that when the hydrochloric acid
came into contact with the magnesium ribbon, bubbles formed indicating the
release of hydrogen gas. The magnesium dissolved and magnesium chloride
solution formed. Based on the student's observations, which type of reaction
occurred?
Answer:
Single replacement reaction
Explanation:
Let us try to write down the reaction equation for the reaction of a magnesium ribbon with hydrochloric acid.
Mg(s) + 2HCl(aq) ------> MgCl2(aq) + H2(g)
A single replacement reaction is a type of chemical reaction in which one element is replaced by another element in a compound.
In this reaction, magnesium replaced hydrogen to form the product. Hence it is a single replacement reaction.
Which lava contains a lot of water
Answer:
i think its magma ajani i looked it up... and chelsey said u had corona so if its true hope u get better bro
Explanation:
What is the temperature of an 11.2-L sample of carbon monoxide, CO, at 744 torr if it occupies 13.3 L at 55 °C and 744 torr? 3C The pressure is not changing, so it looks like a case where charles’ law can be use.
Answer: The tempearture of 11.2 L of CO is [tex]3.0^0C[/tex].
Explanation:
To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.
are the final volume and temperature of the gas.
We are given:
[tex]V_1=11.2L\\T_1=?\\V_2=13.3L\\T_2=55^0C=(55+273)K=328K[/tex]
Putting values in above equation, we get:
[tex]\frac{11.2L}{T_1}=\frac{13.3L}{328K}\\\\T_1=276K=(276-273)^0C=3.0^0C[/tex]
Thus the tempearture of 11.2 L of CO is [tex]3.0^0C[/tex], pressure remaining constant.
The most common experimental technique to perform elemental analysis is combustion analysis, where a sample is burned in a large excess of oxygen and the combustion products are trapped in a variety of ways. A 99.99% pure, 0.4808 g sample containing only carbon, hydrogen, and nitrogen is subjected to combustion analysis, resulting in the formation of 0.6859 g CO2, 0.6973 g H2O, and 0.4646 g NO. What is the empirical formula of the sample
Answer:
C₂H₅N₂
Explanation:
In the combustion analysis, all NO comes from the nitrogen of the sample, that means:
Moles NO = Moles N in the sample
In the same way:
Moles CO2 = Moles C in the sample
Moles H2O = 1/2 moles H in the sample
To solve this problem we must convert the mass of each gas to moles in order to find the moles of each atom. The empirical formula is the simplest whole number ratio of atoms presents in the molecule:
Moles NO = N -Molar mass: 30g/mol
0.4646g * (1mol / 30g) = 0.01549 moles N
Moles CO2 = C -Molar mass: 44.01g/mol-
0.6859g * (1mol / 44.01g) = 0.01559 moles C
Moles H2O = 1/2moles H -Molar mass: 18.02g/mol-
0.6973g * (1mol / 18.02g) = 0.03870 moles H
The ratio of atoms is -Dividing in the low number of moles = moles N-:
C = 0.01559 / 0.01549 = 1
N = 0.01549 / 0.01549 = 1
H = 0.03870 / 0.01549 = 2.5
Twice this ratio of atoms -Because empirical formula must be given only with whole numbers:
C = 2
N = 2
H = 5
The empirical formula is:
C₂H₅N₂Solid A at 80°C is immersed in liquid B at 60°C. Which statement correctly describes the energy changes between A and B?
Heat energy will be released by solid A which will then be absorbed by liquid B.
What is heat energy?
These little particles vibrate back and forth or run into each other constantly. All matter contains a type of energy known as heat (or thermal) energy, which is produced by the movement of particles.
Particle energy increases with temperature. It is possible for some of this energy to be transferred to cooler particles. For instance, in the gas state, when a fast-moving particle strikes a slower-moving particle, some of the energy from the collision is transferred to the slower-moving particle, increasing its speed.
A region of high energy will gradually spread throughout the material as a result of billions of moving particles colliding with one another until thermal equilibrium is established.
Therefore, heat energy will be released by solid A which will then be absorbed by liquid B.
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1. Given the following unbalanced equation:
Al(SO3)3 + NaOH
---> Na2SO3 + Al(OH)3
If you start with 389.4 grams of Al(SO3)3 and 200 grams of NaOH ?
Identify the limiting reactant:
Identify the reactant in excess and by how much:
How many grams of Na2SO, will be produced:
If you perform the same reaction but get 212.4 grams of Na2SO3, what is
your percent yield?
Answer:
Limting reactant: NaOH
Excess reactant: Al₂(SO₃)₃ by 104.9 grams.
315 g of Na₂SO₃ are produced in the reaction
67.4 % is the percent yield.
Explanation:
Balaced equation is:
Al₂(SO₃)₃ + 6NaOH → 3Na₂SO₃ + 2Al(OH)₃
We convert the mass of each reactant to moles, to identify the limiting reactant:
389.4 g . 1mol/ 342.15g = 1.14 moles of sulfite
200 g . 1mol / 40g = 5 moles
1 mol of aluminum sulfite react to 6 moles of NaOH, according to stoichiometry.
If we have 1.14 moles of sulfite, we need (1.14 . 6)/1 = 6.82 moles
We only have 5 mol of NaOH, so this is the limiting reactant.
Then the aluminum sulfite is the excess.
6 moles of NaOH react to 1 mol of sulfite
Then, 5 moles of NaOH may react to (5 . 1)/6 = 0.83 moles.
1.14 mol - 0.83 mol = 0.31 moles remains after the reaction goes complete.
We convert to mass: 0.31 mol . 342.15g/mol = 104.9 g
Then, we work with the limiting reactant. Stoichiometry is 6:3 (2)
6 moles of NaOH can produce 3 moles of sodium sulfite
Then 5 moles will produce (5 . 3)/6 = 2.5 moles
We convert moles to mass: 2.5 mol . 126 g/mol = 315 g.
Percent yield = (Yield produced/Thoeretical yield) . 100
Percent yield = (212.4g /315g) . 100 = 67.4 %
A 36.6-mol sample of Co represents how many atoms?
Answer:
2.20 x 10²⁵ atoms
Explanation:
Atoms of CO= 36.6-mol sample
From Avogadro's constant, which is
(6.022 × 10^ 23 atoms per mole)
Then
Number of atoms=[ 6.022 × 10^ 23 atoms/mole] × [36.6-mol]
= 2.20 x 10²⁵ atoms
Hence, number of atom is 2.20 x 10²⁵ atoms
Help (also tell me what the phenotype and genotypes are)
Answer:
genotype are the organism's hereditary information for example DNA
phenotype are the organism's physical characteristics for example your eyes or hair
or how your nose looks
Which of the following patients should be admitted as an inpatient at a
hospital?
A. Katie's having her tonsils removed and will be able to go home
shortly after she wakes up from surgery.
B. Phil's having his blood sugar tested and having his annual
physical
c. Salvatore's having a hip transplant and will need to be closely
monitored for a week.
D. Chen's having chest X-rays taken to determine if he has a broken
rib.
SUBMIT
What happens to the rate if the concentration of 1-iodopropane remains the same and the concentration of sodium hydroxide is doubled
Answer:
The rate of reaction is doubled
Explanation:
The reaction between 1-iodopropane and sodium hydroxide is an SN2 reaction. This reaction takes place by a concerted mechanism and the hydroxide ion is the nucleophile.
In an SN reaction, the reaction is second order because the rate of reaction depends both on the concentration of the alkylhalide and that of the nucleophile. Hence, when the concentration of 1-iodopropane (the alkyl halide) is held constant and the concentration of hydroxide ion (the nucleophile) is doubled, the rate of reaction is doubled since;
Rate =k [1-iodopropane] [OH^-]
Determine the equilibrium constant for the system N204 = 2NO2 at 25°C.
The concentrations are shown here: [N2O4]= 2.48x10-2M, [NO_]=1.41x10-2M.
HURRRYYY
Answer: K = 8.01 ·10^-3 M
Explanation: K = [NO2] ² / [N2O4] = (0.0141 M)² / 0.0248 M = 0.00801 M
According to the theory of plate tectonics,
which of the following statements is true?
A Earthquakes and volcanoes con change Earth's surface, but the
overall locations of land and ocean do not change over time.
B. Continents have grown, shrunk, and
moved over the course of Earth's history.
C. The ratio of ocean to land on Eorth has been
pretty much the same throughout Earth's history,
According to the data, which part is described by the letter K?
a
constellation
b
galaxy
c
meteoroid
d
planet
Answer:
C meteoroid
Explanation:
Meteoroids are the only ones of the four that are under a kilometer in size.
AB G C F G Y OBLAD
E Y RESISTANCE
Ữ U A F H I K C V B C H
UK V WY FHB CAET
HAIR SD GH J K LE
CMTU ONHULG EA
A OY S HAV CFH RM
RMOTION RS FAW
AYKY OHBWIST R
P PULL DOWN AEE
help me finding six words
Explain what is meant by a river’s load, and describe how the load is carried.
Please hurry I m timed T-T
Answer:
A rivers load is gravel and sand. It is carried by being dragged, rolled, and bounced along the bed of the river.
Explanation:
Answer:
the amount of gravel and sand at a river
the load is carried by the moving water
What is NaC2H3O2 coefficient
Answer:yes coefficient u mean??
Explanation:
A sample of unknown pressure occupies 0.776L at a temperature of 298K. The sample of gas is then tested under known
conditions and has a pressure of 32.6 kPa and occupies 0.664L at 303K. What was the original pressure of the gas?
A. 27.43 kPa
B. 38.62 kPa
C. 58.73 kPa
D. 84.11 kPa
Answer:
27.43 kPa (Option A)
Explanation:
We can solve this by the use of the Ideal Gases Law.
P . V = n . R . T
As n and R are constant, we avoid them from the equation so:
P₁ . V₁ / T₁ = P₂ . V₂ / T₂
P₁ . 0776L / 298K = 32.6 kPa . 0.664L / 303K
P₁ . 0776L / 298K = 0.0714 kPa .L/K
P₁ . 0776L = 0.0714 kPa .L/K . 298K
P₁ = 21.289 kPa.L / 0.776L
P₁ = 27.43 kPa
What energy transformations occur in a hot air balloon?
Answer:
: kinetic energy is the energy transformation that occurs in a hot balloon.
Explanation:
Hot air balloons use a propane burner that converts chemical energy to thermal energy. The hot air is less dense than than the colder air and it lifts the balloon
25m
45m
Help pls.........
Answer:
45m
Explanation:
what are the examples of Biosphere
patulong po thank you ❣️❣️
Answer:
[tex]\color{Blue}\huge\boxed{Answer} [/tex]
An example of the biosphere is where live occurs on, above and below the surface of Earth. The zone of planet earth where life naturally occurs, extending from the deep crust to the lower atmosphere. The living organisms and their environment composing the biosphere. The living organisms of the earth.
Morgan wants to compare the weather conditions at her school each day during the week. She decides to measure and record weather data each day at noon. Which of the following measurements would be least useful to report?
humidity
elevation
wind speed
air temperature
Answer: Air Temperature
What is the proper formula for vanadium (iv) percholrate?
Answer:VO(ClO4)3 i'm sure this is it
Explanation:
5.Name the compound below
Answer:
There isn't anything below, but i can help if you edit the question and put it there
Explanation:
~Bre
Question 2
1 pts
r
A compound is 31.1 % S, the rest is chlorine. The compound has a molecular mass of 205.94 amu.
What is its molecular formula?
Explanation:
its hard to explain unless we know what the question fully asks..
A weather balloon has a volume of 200.0 L at a pressure of 760 mm Hg. As it rises, the pressure decreases to 282 mm Hg.
a. Will the volume of the balloon increase or decrease? Why?
b. What is the new volume of the balloon? (Assume constant temperature)
Answer:
a. Increase
b. 539 L
Explanation:
Step 1: Given data
Initial volume (V₁): 200.0 LInitial pressure (P₁): 760 mmHgFinal volume (V₂): ?Final pressure (P₂): 282 mmHgStep 2: Calculate the final volume of the gas
The pressure of the gas is inversely proportional to the volume. So, as the pressure decreases, the volume must increase. Assuming constant temperature and ideal behavior, we can calculate the final volume of the gas using Boyle's law.
P₁ × V₁ = P₂ × V₂
V₂ = P₁ × V₁/P₂
V₂ = 760 mmHg × 200.0 L/282 mmHg = 539 L
Propose a mechanism and predict the products for the solvolysis of 2-bromo-2,3,3-trimethylbutane in methanol.
Answer:
See explanation and image attached.
Explanation:
Solvolysis is a reaction in which the solvent is also the nucleophile. The reaction occurs by SN1 mechanism since it yields most stable carbocation. The SN1 mechanism predominates since a weak nucleophile/base is used.
The major product as shown is the image attached to this answer. The first step is the loss of the bromide ion followed by nucleophillic attack of the solvent. Loss of H^+ completes the mechanism.
when iron rust it reacts with nitrogen from the air
true or false
it is false it reacts with oxygen
give brainliest if right
To solve such this we must know the concept of oxidation reaction. Therefore, the given statement is incorrect. When iron rust it reacts with oxygen from the air.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
In oxidation reaction, one of the element of the given compound oxidises to its higher oxidation state. Rusting is an example of oxidation reaction. The balanced equation for the rusting reaction can be given as
4Fe + 3O[tex]_2[/tex] + 6H[tex]_2[/tex]O → 4Fe(OH)[tex]_3[/tex]
Therefore, the given statement is incorrect.
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