In an ecosystem, possible sources of groundwater contamination caused by human activity are excessive use of fertilizers and chemicals seeping in to the ground.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Calculate the percent yield for the reaction above if 25.0 grams of
H2SO4 was actually produced and the theoretical yield was predicted to be 42.0 grams. (% yield = Actual/ theoretical x 100)
SO3(g) + H200 H2SO4(9)
O 59.5
O 168
O 0.595
O 1.68
Answer:
A. 59.5
Explanation: actual divided by theoretical times 100 equals percent yield so 25/42 times 100 is 59.5 ish
The concentration of an acid or base is defined as the ratio of the amount of
O A. solvent to the amount of solute in a solution
O B. conjugate acid to conjugate base
O C. conjugate base to conjugate acid
OD. solute to the amount of solvent in a solution
The concentration of an acid or base is the ratio of the amount of solute to the amount of solvent in a solution, which is option D.
Explanation:The concentration of an acid or base is defined as the ratio of the amount of solute to the amount of solvent in a solution. This means that the correct answer is D. solute to the amount of solvent in a solution. When looking at a solution of an acid or base, you may also consider the number of H+ or OH- ions present in the formula to understand the actual concentration of H3O+ or OH- ions, which can differ from the overall concentration of the acid or base.
"The correct answer is D. solute to the amount of solvent in a solution.
The concentration of an acid or base, or any solution, is typically expressed as the amount of solute present in a given amount of solvent. The solute is the substance that is dissolved in the solvent, which is the substance that does the dissolving. In the context of acids and bases, the concentration is often given in terms of molarity (moles of solute per liter of solution), molality (moles of solute per kilogram of solvent), or other concentration units.
In this expression, the amount of solute (n) is divided by the volume of the solution (V), which includes both the solute and the solvent. This ratio gives us the concentration of the solute in the solvent.
The other options provided are incorrect for the following reasons:
Option A (ratio of the amount of solvent to the amount of solute) is the inverse of the correct definition of concentration.
Option B (ratio of the conjugate acid to the conjugate base) refers to the acid dissociation constant (Ka) for acids or the base dissociation constant (Kb) for bases, which are measures of the strength of an acid or base, not its concentration.
Option C (ratio of the conjugate base to the conjugate acid) is also related to the strength of an acid or base in terms of its equilibrium constant, not its concentration.
Therefore, the correct definition of the concentration of an acid or base solution is the ratio of the amount of solute to the amount of solvent, which corresponds to option D."
Danielle has blonde hair. Her mother has blonde hair and her father has brown.
Which explains how danielle inherited her hair color
Answer: She inherited a chromosome that carries an allele for hair color from each parent.
Explanation: took test - this answer is correct on Edg
Answer:
D is the answer :)
How many moles of magnesium nitrate are in 6.35 grams of magnesium nitrate?
Answer:
0.0428 moles
Explanation:
6.35 g Mg(NO3)2 ×
[tex]\frac{1 \: mol}{148.32 \: g} [/tex]
6.35 g / 148.32 g
0.0428 moles
According to mole concept, there are 0.0428 moles of magnesium nitrate in 6.35 grams of magnesium nitrate.
What is a mole?Mole is defined as the unit of the amount of substance . It is the quantitative measure of amount of substance of how many elementary particles are present in a given amount of substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom or ion depending on the type of substance. Amount of elementary entities present in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.Number of moles=mass/molar mass= 6.35/148.3=0.0428 moles.
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Angle of incidence and refraction for air at 0 degrees?
Answer:
zero
Explanation:
When the air is zero degrees then it implies that the air is travelling at an perpendicular to the normal direction.
Therefore, the angle of incidence would be zero degree and in relation to that the angle of reflection and refraction would also be zero degree as per the laws of reflection.
In other ways it can be said that the light goes un-deviated.
Atoms of _______ lose electrons to empty their outer electron shells and become ________ ions.
A. None of these
B. metals, negative
C. nonmetals, negative
D. metals, positive
Atoms of metal lose electrons to empty their outer electron shells and become positive ions.
What is metal ?A metal is a substance that has a shiny look when freshly processed, polished, or shattered, and conducts electricity and heat rather effectively. Generally speaking, metals are malleable and ductile. These characteristics are the outcome of the metallic link between the metal's atoms or molecules.
According to popular belief, the term "metal" originated during the hippy era, when "heavy" denoted profundity or seriousness. Metal music is centered on a few essential elements.
Atomic components like electrons, neutrons, and protons make up metals. The quantity of protons in an atom can be used to identify it from an atom of another element.
Thus, option D is correct.
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One side of a cube is 5 cm long. What is the cube's volume?
5
15
25
125
Answer: 125
Explanation: volume is l x w x h and if its a cube then length, width and the height will be the same so its just 5 x 5 x 5
True or False: Water molecules "stick together" due to hydrogen bonds.
Answer:
True
Explanation:
To begin with,
Hydrogen bonds are attractions that contain a force caused by the difference in charge. This is due to the positive hydrogen ions as well as slightly negative ions. Therefore, hydrogen bonds make water molecules 'sticky.' To add, the attractions between hydrogen bonds are weaker than ionic and covalent bonds but strong enough to cause them to 'stick together'
Hope this helps.
Is the melting of Arctic ice an example of
positive feedback or negative feedback?
Explain
Answer:
here is your answer buddy
Ice-albedo feedback is a strong positive feedback in the climate system. Warmer temperatures melt persistent ice masses in high elevations and upper latitudes. Ice reflects some of the solar energy back to space because it is highly reflective.
Explanation:
please mark me as brilliant
Which is most likely an effect of long-term environmental changes
Answer:
adaptation
extinction
speciation
Explanation:
Answer:
D
Explanation:
can somebody help me with chemistry ?
Answer:
Sure!
A) Base
A) it will conduct electricity
Explanation:
To answer your question:
Phenolphthalein is one of the most widely used indicator in acid–base titrations. In titration setting, it turns colorless in acidic solutions and pink in basic solutions.
Thus the cleaning solution is A) Base
Another way to know it is a base is by looking at pH.
pH scale is 0-14 (0-6 Acidic, 7 Neutral, 8-14 basic) thus since cleaning solution has pH of 9.6 it falls under the pH range of 8-14 which is basic, hence your solution is basic.
HNO3 is a strong acid hence when put it in water it dissociates into ions. IONS are required to transmit electricity hence HNO3 will conduct electricity
What is the molar volume of a gas at standard temperature and pressure?
LOL
241
1121
2241
Which of the following Substances would have the highest vapor pressure at 298 K?
A) propanol (b.p.= 97 °C)
B) acetone (b.p.=56°C)
C) benzene (b.p. = 80°C)
D) chloroform (b.p. = 61°C)
Answer:B
Explanation:Because acetone has the lowest boiling point of the options given,it also has the weakest intermolecular forces and will therefore have the highest vapor pressure
"acetone (b.p.=56°C)" would be the highest vapor pressure.
The maximum vapor pressure would be found at the lowest temperature. Acetone seems to have the smallest intermolecular hydrogen bonding and therefore the greatest evaporation rate.Acetone seems to have the different boiling points of something like the choices shown. As a result, acetone seems to be the right answer, while the other answers are erroneous even though they have greater boiling pressures than acetone.Thus the above option i.e., "alternative B" is correct.
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What type of reaction occurs when H+ reacts with OH-
Answer:
acid/base reaction
Explanation:
H+ is acid
OH- is base
Know base and acid properties.
- Hope that helps! Please let me know if you need further explanation.
Answer:
neutral.
this is because the concentration between hydrogen and hydroxide is equal
Explanation:
The reaction forms water
A chemist is analyzing a substance known to be an Arrhenius acid. Which of the following substances could it be?
a) HNO3
b) H2O
c) KOH
d) NH3
Answer:
HNO3
Explanation:
Nitric Acid is an example of an Arrhenius acid.
Final answer:
HNO₃ (nitric acid) is the only substance among the listed options that qualifies as an Arrhenius acid as it increases the concentration of H+ ions in aqueous solutions.
Explanation:
An Arrhenius acid is a substance that increases the concentration of H+ ions in water, which usually results in the formation of hydronium ions (H₃O+). Given the choices provided, the substance that qualifies as an Arrhenius acid is HNO₃ (nitric acid). This is because HNO₃ dissociates in water to produce H+ ions and NO₃⁻ ions.
a) HNO₃ - This is an Arrhenius acid as it produces H+ ions when dissolved in water.
b) H₂O - Water is not an Arrhenius acid; it is neutral, acting as an acid or a base under different conditions.
c) KOH - Potassium hydroxide is an Arrhenius base because it increases the concentration of OH- ions in solution.
d) NH₃ - Ammonia is considered a Brønsted-Lowry base, but not an Arrhenius acid or base, as it does not produce OH- ions in solution.
Determine whether each substance will sink or float in corn syrup, which has a density of 1.36 g/cm3. Write “sink” or “float” in the blanks. Gasoline: Water: Honey: Titanium:
Answer:
Here's what I get
Explanation:
A substance with ρ < 1.36 g/cm⁻³ will float on corn syrup.
A substance with ρ > 1.36 g/cm⁻³ will sink in corn syrup
[tex]\begin{array}{rrr}\textbf{Substance} & \mathbf{\rho/g\cdot \textbf{cm}^{-3}}& \textbf{Sink/Float}\\\text{Gasoline} & 0.75 & \text{Float}\\\text{Water} & 1.00 & \text{Float}\\\text{Corn syrup} & 1.36 & -\\\text{Honey} & 1.42 & \text{Sink}\\\text{Titanium} & 4.54 & \text{Sink}\\\end{array}[/tex]
Answer:
Gasoline and water floats, Honey and Titanium sinks.
Explanation:
How would you describe a particle of alpha radiation?
-a helium atom with no neutrons
-an electron ejected from a neutron
-a highly energized light particle, or photon
-a helium nucleus with no electrons
Answer:
A helium atom with no neutrons
Which of the following BEST explains how matter and energy cycle through ecosystems?
Answer:
A
Explanation:
20. If you add the same amount of heat to a kilogram of water and a
kilogram of gold, would they both be the same temperature? If not,
which would be higher? Why? Assume that both start out at the same
temperature.
Final answer:
No, the final temperature of water will be higher than that of gold because water has a higher specific heat capacity.
Explanation:
No, when the same amount of heat is added to a kilogram of water and a kilogram of gold, they will not both reach the same temperature. The final temperature of water will be higher than that of gold. This is because water has a higher specific heat capacity than gold.
Specific heat capacity is the amount of heat energy required to raise the temperature of a material by one degree Celsius per unit mass. Water has a specific heat capacity of approximately 4.18 J/g°C, while gold has a specific heat capacity of about 0.13 J/g°C. This means that it takes much more heat energy to raise the temperature of water compared to gold.
Therefore, even if the same amount of heat is added to both substances, the water will experience a larger increase in temperature compared to gold.
What is the electron configuration of a potassium ion when it has formed an ionic bond with a bromine ion?
A. [2.8.2]-
B. [2.8.8]-
C. [2.8.8]+
D. [2.8]+
A. [2.8.2]- exists the electron configuration of a potassium ion when it contains created an ionic bond with a bromine ion.
What is Electron configurations?Electronic configuration, also named electronic structure, is the arrangement of electrons in energy levels about an atomic nucleus. According to the older shell atomic model, electrons occupy several groups from the first shell nearest the nucleus, K, through the seventh shell, Q, distant from the nucleus.
Electron configurations exist as the summary of where the electrons are around a nucleus
A. [2.8.2]- exists the electron configuration of a potassium ion when it contains created an ionic bond with a bromine ion.
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CAN SOMEONE PLEASE HELP ME I DON’T UNDERSTAND :(
Answer:
A supersaturated solution
How many years about was most of North America in the southern hemisphere?
N each reaction box, place the best reagent or reactant from the list below. reagents may be used more than once or not at all. draw the intermediate products b and c (both are neutral; omit byproducts).
Answer:
See explaination
Explanation:
See attachment for the drawing of the intermediate products b and c (both are neutral; omit byproducts).
Which is the correct order of the celestial
bodies during a solar eclipse?
A. Sun, Moon, Earth
B. Sun, Earth, Moon
C. Moon, Earth, Sun
D. Moon, Sun, Earth
Answer:
Which is the correct order of the celestial
bodies during a solar eclipse?
A. Sun, Moon, Earth the right answer good luck
what total mass of a 16 gram sample of 60Co will remain unchanged after 15.9 years
Answer:
2 g
Explanation:
Please HELP
Can more than just one electron transfer to form an ionic compound? Explain and give an example
Answer: Yes , in [tex]MgCl_2[/tex], two electrons from magnesium are transferred to chlorine atoms.
Explanation:
Ionic compound is formed by the transfer of electrons. For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
For example : For formation of [tex]MgCl_2[/tex]
Electronic configuration of magnesium:
[tex][Mg]=1s^22s^22p^63s^2[/tex]
Magnesium atom will loose two electrons to gain noble gas configuration and form magnesium cation with +2 charge.
[tex][Mg^{2+}]=1s^22s^22p^63s^0[/tex]
Electronic configuration of chlorine:
[tex][Cl]=1s^22s^22p^63s^23p^5[/tex]
Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.
[tex][Cl^-]=1s^22s^22p^63s^23p^6[/tex]
In Magnesium chloride two electrons from magnesium metal gets transferred to two chlorine atoms and thus [tex]MgCl_2[/tex] is formed.
What are the ways in which energy conversion can occur?
Answer:
Energy can exist in many forms within a system and may be converted from one form to another within the constraint of the conservation law. These different forms include gravitational, kinetic, thermal, elastic, electrical, chemical, radiant, nuclear, and mass energy.
Explanation:
Energy can exist in many forms within a system and may be converted from one form to another within the constraint of the conservation law. These different forms include gravitational, kinetic, thermal, elastic, electrical, chemical, radiant, nuclear, and mass energy.
Energy can be converted from one form to another; Mechanical energy to electrical energy, Electrical energy to chemical energy.
Principle of conservation of energy
The principle of conservation of energy states that, energy can neither be created nor destroyed but can be converted from one form to another.
Conversion of energy from one form to anotherMechanical energy to electrical energy: This occurs when a generator is used to produce electricity.Electrical energy to chemical energy: This occurs when current is used to slit or deposite molecules in electrolysisChemical energy to electrical energy: This occurs when chemical energy from a battery is usued to power a torch light.Learn more about energy conversion here: https://brainly.com/question/961052
The ____ can be described as the basic unit of life. (2 points) atom neutron cell nucleus
Answer:
the cell can be the described as the basic unit of life
dark matter causes objects to what
Answer:
Dark matter does not really affect objects to do anything really, but it is know to be very dense in gravitational pull and does not emit any radiation.
Explanation:
If a student wanted to find a diagram of the human reproductive system in his/her science textbook, which part of the book should be looked at FIRST?
A) appendix
B) bibliography
C) glossary
D) index
Answer:D)index
Explanation: