Botswana is a multiparty, republican democracy with a constitution. Its constitution provides for indirect presidential election and popular election of a National Assembly.
Why does the solubility of gas decreases with temperature?The solubility of gas decreases at higher temperatures, gas molecules have higher kinetic energy and can escape solution phase more easily.
The solubility of a gas decreases as temperature rises. Henry's law describes the relationship between a gas's pressure and solubility.
The solubility of gases in liquids decreases as temperature rises. Adding heat to the solution, on the other hand, provides thermal energy that overcomes the attractive forces between the gas and the solvent molecules, lowering the gas's solubility.
Thus, Botswana is a multiparty, republican democracy with a constitution.
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Which of the following options correctly express the relationship between the volume and temperature of a gas at constant pressure? Select al that apply. Check all that apply.
- As the temperature of the gas increases, the volume will increase. - There is an inverse relationship between volume and temperature. - VT is a constant value - The volume of the gas is directly proportional to the absolute temperature.
The correct relationship between the volume and temperature of a gas at constant pressure is the volume of the gas is directly proportional to the absolute temperature.
At constant pressure, as the temperature of a gas increases, the kinetic energy of its particles also increases, causing them to move faster and collide with the walls of the container with greater force. As a result, the volume of the gas increases. This relationship is described by Charles's law, which states that the volume of a fixed amount of gas at constant pressure is directly proportional to its absolute temperature. This relationship can also be mathematically described by the Ideal gas law, PV=nRT, where P is pressure, V is volume, T is temperature on the absolute scale, n is the number of moles of the gas and R is the ideal gas constant. When pressure is constant, we have PV = nRT, thus V = (nRT)/P = kT, where k is a constant. So, the volume of the gas is directly proportional to the absolute temperature.
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experiment 1: what was the mass of the empty, open 150-ml erlenmeyer flask? note: the sizes of containers in the lab may vary. select the closest answer.
The mass of an empty, open 150-ml Erlenmeyer flask would typically be around 60-70 grams.
The mass of an empty, open 150-ml Erlenmeyer flask can vary depending on several factors. The main factor is the material the flask is made from. If the flask is made of glass, the mass will be relatively consistent across different flasks of the same size, with a typical mass of around 60-70 grams.
However, if the flask is made of plastic, the mass can vary depending on the specific type of plastic and the manufacturing process used. Additionally, the mass of the flask can vary depending on the thickness of the walls and the quality of the manufacturing.
Another factor that can affect the mass of the flask is the presence of any additional features or components, such as a lid or a handle. These additional components can add to the overall mass of the flask.
In summary, the mass of an empty, open 150-ml Erlenmeyer flask can vary depending on the specific flask and the materials it is made from, but typically it weighs around 60-70 grams. Without more information about the specific flask in question, it is difficult to provide an exact mass.
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13. You dissolve 0.01 moles of glycine in 1 liter of water. The pkas of glycine are 2.35 and 9.78a. Draw the titration curve in terms of pH vs equivalents of base.b. Draw the titration curve in terms of pOH vs equivalents of base.c. You adjust the pH to 7.0. You then add 0.005 moles of NaOH.Draw the structure(s) of the ionic species of glycine present in the solution and indicate the proportion of eachspecies.4. What is the approximate pH of the solution in part c?e. Would the solution be a good buffer? Explain
The approximate pH of the solution after adding 0.005 moles of NaOH is 9.78, glycine solution will act as a good buffer at this pH because it forms zwitterion.
When the pH is equal to 7 , almost 100% of glycine exists in the zwitterion form. When we add 0.005 moles of NaOH,
0.005 moles of NaOH ⇒ HA equals to 0.005moles and A⁻ also equals to 0.005moles (50%)
pH will be equal to pKa = 9.78.
At the pH = 9,78, both the conjugate base as well as the acid are present in the solution which are able to resist pH changes which can be either by the addition of strong acid or by the addition of strong base. Therefore, in the pH range of 8.6 to 10.6, glycine acts as a very effective buffer.
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2. assign a designation of re, si, or n (not prochiral) to indicate which face we are looking down on for each of the sp2-hybridized carbons in the structure below.
For the structure below, the [tex]sp^{2}[/tex]-hybridized carbons can be assigned the designations of re and si, respectively.
There designation indicates that we are looking down on the face of the carbon that is farthest away from us, while the si designation indicates that we are looking down on the face of the carbon that is closest to us.
The [tex]sp^{2}[/tex]-hybridized carbons are carbon atoms that have three [tex]sp^{2}[/tex] hybrid orbitals, which are a combination of s- and p-orbitals. These orbitals are used to form three covalent bonds and one unshared pair of electrons, giving the carbon atom a trigonal planar shape.
This type of hybridization is common in molecules with double bonds, such as alkene molecules, as it allows the carbon atoms to form strong double bonds with other atoms. The [tex]sp^{2}[/tex]-hybridized carbons are important in organic chemistry as they allow for a wide range of reactions to take place.
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the mass of a gas molecule (or atom) can be computed from the specific heat at constant volume cv. given that the specific heat of argon is cv
The mass of a gas molecule (or atom) can be computed from the specific heat at constant volume . The mass of the gas is 6.6 × 10⁻²³ kg. The molar mass of the is 39.74 g/mol
The specific heat at constant volume, cv = 0.075 cal/g °C.
Cv = ( 3/2) R = ( 3/2) ( 1.98) = 2.98 cal /mol K
The molar mass, M = m / n = Cv / cv
= 2.9805/0.075
=39.74 g/mol
The mass = molar mass / Na
The mass = 38.74 / 6.023 × 10²³
The mass = 6.6 × 10⁻²³ kg
This question is incomplete, the complete question is :
The mass of a gas molecule (or atom) can be computed from the specific heat at constant volume cv. given that the specific heat of argon is cv is 0.075 cal/g °C for a gas and calculate (a) the mass of its atom and (b) the molar mass.
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a is a concise statement that summarizes observed behaviors and observations and predicts future observations.target 1 of 3 a is a tentative interpretation or explanation of the observed phenomena.target 2 of 3 a attempts to explain why the observed behavior is happening.
The fill in the blanks is given below as :
a) Law
b) Hypothesis
c) Theory
a) A Law is a concise statement that summarizes the observed behaviors and the observations and predicts future observations.
b) A hypothesis is a tentative interpretation or the explanation of the observed phenomena. The hypothesis is the presumption of that hasn't been proven yet or the verified but still need to evaluated through the test.
c) A theory is a attempts to explain that why the observed behavior is happening. The theory is the principle that explains the events that has already been investigated.
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Need help with this please
For granulocyte concentrations, all of the following lab tests must be performed on the unit by the donor center except? A.) ABO and RH
B.) Red Cell antibodies
C.) Infectious disease markers
D.) Lymphocyte enumeration
For granulocyte concentrations, all of the following lab tests must be performed on the unit by the donor center except lymphocyte enumeration.
Granulocytes are immune cells with granules (small particles) containing enzymes that are released during infections, allergic reactions, and asthma attacks. Granulocytes include neutrophils, eosinophils, and basophils. Granulocytes are specialized white blood cells. On the other hand, lymphocytes are a type of white blood cells (leukocytes) which are agranulocytes - meaning, that they lack presence of granules in their cytoplasm - they are not granulocytes. Lymphocytes constitute of B and T cells. Lymphocyte enumeration is an assay designed for enumerating the percent and absolute cell counts of lymphocyte subsets in lysed whole blood. Antibodies which are specific for certain cell surface antigens present on the lymphocytes, are labeled with fluorochromes. When whole blood sample and these labelled antibodies are added together, these antibodies bind to the targeted antigens on the lymphocytes. Following incubation, lysing and fixation, absolute count and percentage count are enumerated utilizing an internal quantitation standard.
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how was the molar mass of hydrogen determined to be one gram after one mole of carbon-12 assigned to have a mass of 12 grams
The molar mass of hydrogen was determined to be one gram after one mole of carbon-12 was assigned to have a mass of 12 grams because the mass of one mole of hydrogen was found to be one-twelfth the mass of one mole of carbon-12.
What is the molar mass of an element?The mass in grams of 1 mole of an element (or compound) is known as its molar mass, which is measured in grams per mole (g/mol) units.
Carbon-12 isotope was used as the standard for determining the molar mass of other elements.
One mole of carbon-12 was found to have a mass of 12 g.
Hence, the mass of one mole of other elements was determined by comparing their mass to the mass of one mole of carbon-12.
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what is the chemical reaction that occurred in the leaf disks? write out the reactants and products.
The chemical reaction that occurred in the leaf disks NaHCO₃ + H⁺⇒ Na + H₂O + CO₂. The reactant is sodium bicarbonate and the product is water and carbon dioxide.
To measure the net rate of photosynthesis under varying illumination conditions using leaf disks. Normally, leaf disks float; however, when carbon dioxide is introduced into the air gaps, the lead disk's overall density rises, and the leaf disk sinks. The leaf disks sink when sodium bicarbonate is added to the water because the bicarbonate ion serves as a carbon source for photosynthesis.
The process of photosynthesis results in the release of oxygen into the leaf's interior, which alters the buoyancy of the leaf and causes the disk to rise. Because cellular respiration occurs concurrently in the leaf, the oxygen produced by photosynthesis is used up. As a result, the net rate of photosynthesis is indirectly related to the pace at which the disks are rising.
We can investigate the effects of carbon dioxide supplies on the rate of photosynthesis because photosynthesis requires carbon dioxide as well. Water often contains some dissolved oxygen in modest amounts. By boosting the amount of carbon dioxide in the water, sodium bicarbonate or baking soda will make it more readily available to the leaves of our plants.
NaHCO₃ + H⁺⇒ Na + H₂O + CO₂
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Which of the following explains the interactions that occur between the atoms of water molecules and the ions that form when sodium chloride dissolves in water?
hydrogens interact with the chloride ion, oxygens interact with the sodium ion
Water's covalent bonds are more powerful than salt molecules' ionic bonds, so when salt is combined with water, the salt dissolves.
The negatively charged side of the water molecules is drawn to the positively charged sodium ions, whereas the positively charged side is drawn to the negatively charged chloride ions. In essence, a tug-of-war takes place, with the water molecules coming out on top. The ionic link that held sodium and chloride ions together is broken when water molecules force the ions apart.
Both the water molecule and the salt molecule are polar, meaning that the positive and negative charges are located on opposite sides of the molecule. This makes it possible for the salt molecule to dissolve in the water molecule.
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for the pair of compounds ch3oh c h 3 o h or h2co h 2 c o the one with the higher vapor pressure at a given temperature is ____.
For the pair of compounds CH3OH and H2CO, the one with the higher vapor pressure at a given temperature is CH3OH.A substance's propensity to transform into a gas.
at a specific temperature is measured by a substance's vapor pressure. The likelihood of a material being in the gaseous form at a given temperature increases with increasing vapor pressure.More volatile than H2CO is the molecule CH3OH. A hydroxyl (-OH) group, a polar group, is bonded to the carbon atom in CH3OH, a primary alcohol. Due to greater intermolecular interactions, such as hydrogen bonding, made possible by CH3OH's polarity, such as higher boiling points and lower vapor pressures.At normal temperature, formaldehyde, commonly known as H2CO, exists as a gas with a greater vapor pressure than CH3OH.Remember that vapor pressure is a function of temperature.
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Gaseous ammonia chemically reacts with oxygen gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of oxygen needed to produce 1.6 mol of nitrogen monoxide. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
2 moles of oxygen have been necessary to start producing 1.6 moles of nitrogen monoxide.
Describe nitrogen.Nitrogen, sometimes known as N, is an element that has no taste or color. Nitrogen can be found in the air we breathe, the liquids we drink, and the floor beneath our feet. In fact, nitrogen has been the most common element in the stratosphere, accounting up 78% of it.
How does nitrogen become made?The atomic number of the alkali metal nitrogen is seven, and its nucleus has seven protons. Single - molecule nitrogen is a chemical compound made up of two tightly bound nitrogen atoms (N2). Isolated nitrogen is a clear, odorless, unpalatable, and inert gas at ordinary temperatures and pressure.
The mole ratio,
O₂ : NO = 5:4
= 5 / 4 * 1.6
= 8 / 4
= 2 mol
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which of the following molecules will dissolve readily in water? please check all that apply. group of answer choices c6h12o6 nacl cholesterol c6h14 triglyceride
C6H1206(glucose) and NaCl(sodium chloride) will readily dissolve in water.
What are molecules?A molecule is a chemical substance made up of bound pairs of two or more atoms. A molecule might contain atoms of the same element or different elements.
Since water is a polar solvent, glucose and sodium chloride chemicals are polar compounds. This indicates that the molecules' positive and negative ends are drawn to the ends of the water molecules' positive and negative ions, making it simple for them to mix and distribute themselves uniformly.
Both cholesterol and hexane (C6H14) are hydrophobic chemicals that don't mix with water. Triglycerides are large molecules with a glycerol backbone and three fatty acid chains that are insoluble in water.
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Which of the following correctly describe gas law problems? Select all that apply. Check all that apply. An individual gas law can be used to solve problems where more than one variable is unknown. The ideal gas law can be used to solve all gas law problems. The ideal gas law can be used to solve problems where one variable is unknown and the rest are known. All gas law problems require the use of the ideal gas constant R. An individual gas law can be used to solve problems where the change in one variable affects another while two other variables are held constant.
The issue can be resolved by applying a single gas law when two other variables remain constant and one changes. Issues with gas law are accurately described by this statement.
When scientists realized there could be correlations between a sample's pressure, volume, and temperature that would essentially apply to all gases, they developed the gas laws at the end of the 18th century. Given a constant temperature and pressure, the number of gas molecules is directly proportional to the amount of gas in a given volume. While the temperature and volume of the gas are constant, the pressure of the gas is directly influenced by the number of gas molecules present.
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to complete the following biochemical reaction, how much dissolved oxygen in mg/l is needed for a solution containing 1 mg/l of ch2o?
In the following biochemical reaction, the dissolved oxygen in mg/l is needed for the solution containing 1 mg/l of CH₂O is 1 mg /L.
The reaction is given as :
CH₂O + O₂ ----> CO₂ + H₂O
The molar mass of CH₂O = 30 g/mol
The molar mass of O₂ = 32 g /mol
1 mole of O₂ react with 1 mole of CH₂O
30 g CH₂O react with 32 O₂
so, 1 mg / L of CH₂O require = (32 / 30 ) × 1 mg/L
1 mg / L of CH₂O require = 1.0 mg/L of oxygen.
Thus, the oxygen needed is 1.0 mg/L .
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is the liter value for titration molarity calculation the difference between the final and inital values
NaOH has ais a liter value for titration molarity of 1 mole.
Molarity-
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another term for molarity.
If you know how many grams of NaOH is dissolved in a known amount of solvent, you can use the formula below to calculate its molarity.
The molarity of NaOH is determined, for instance, when 10 gm of NaOH is dissolved in 250 ml of water.
Molarity is calculated as (Weight of NaOH taken*1000)/(250*NaOH's molecular weight).
Molarity equals (10*1000)/(250*40).
NaOH has a molarity of 1 mole.
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The full question-
How do you calculate the molarity of NaOH?
identify the correct statement below. multiple choice you are not allowed to eat, but you can drink beverages in the lab. it is alright to bring a beverage into the lab as long as it is kept closed. food and beverages should never be consumed or brought into the lab. you are allowed to eat on the lab bench as long as you sterilize it with ethanol first.
You are not permitted to eat in the lab, but you may consume beverages. Eating and drinking are permitted in the laboratory as long as there are no open cultures on the bench top.
A laboratory is a controlled environment in which scientific or technological research, experiments, and measurements can be carried out. Laboratory services are available in a variety of settings, including doctors' offices, clinics, hospitals, and regional and national referral centres.
The various requirements of the specialists working within laboratories determine the organisation and content of laboratories. A physics laboratory might have a particle accelerator or a vacuum chamber, whereas a metallurgy laboratory might have equipment for casting, refining, or testing metal strength. A wet laboratory may be used by a chemist or biologist, whereas a psychologist's laboratory may be a room with one-way mirrors and hidden cameras to observe behaviour.
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a plot of PV/RT against Pext gives a lower value than the ideal at moderate pressures and a higher value than the ideal at very high pressures for most gases. select all the statements that correctly account for this behavior
-at low pressures gas particles repel each other
-at very high pressures the molecular volume of the gas particles is significant
-at low temps, the gas particles are moving at slower velocities
-at moderately high pressures there are significant intermolecular attractions
At very high pressures, the molecular volume of the gas particles is significant. At moderately high pressures there are significant intermolecular attractions is the statements that correctly account for this given behavior.
PV = nRT is an equation of states.
There are three variables P, V, and T. They are variables because they give information on a gas's pressure, volume, temperature, and other physical properties in a specific circumstance.
The number of moles (n) can be kept constant while the ideal gas constant (R) can be discovered in chemical literature.
The following is how Moles (n) can be set to PV / RT as follows n = PV / RT. Because pressure (P), which depends on the T/V ratio and is inversely proportional to both T and V, becomes crucial.
Volume (V) is a function of T/P, where T and P are both inversely proportional to V. Temperature (T) requires PV as a prerequisite, which is directly proportional to variations in both P and V.
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Which statement about the scientific consensus is true
Answer:
u forgot send the exercise.. try it again
_______ capacity is a term used to describe the ability of a solution to prevent large changes in pH with the addition of a base or acid.
a) Heat
b) Buffering
c) Vaporization
d) Cohesive
e) Freezing
Buffering capacity measures a solution's capability to withstand pH fluctuations by either absorbing as well as desorbing H+ as well as OH- ions.
Aqueous buffer solutions were made up of a weak acid as well as its conjugate base or even a weak base as well as its conjugate acid. The capability of buffer solutions to keep a fairly constant pH value in reaction to the addition of a tiny amount of acid or base is an important attribute.
A buffer would be a solution that avoids pH changes when a minuscule portion of strong acid as well as strong base is added. Technical definition (How does one come up with one?): A buffer was made up of a weak acid and its conjugate base.
Thus, the correct answer will be option (b).
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A student titrates 10.0 g of his borax solution with 3.00 M sulfuric acid, requiring 182 microliters of the acid
to reach the equivalence point. Calculate the mass percent of the borax solution.
a 17-year-old boy is brought to the emergency department by his friends. they were at a house party and found their friend unconscious after he ingested an unknown substance. on physical exam, vital signs are temp 96f, heart rate 50, respiratory rate of 4, and oxygen saturation 92% on room air. the boys pupils are miotic. on lung auscultation, there are crackles bilaterally. you administer supplemental oxygen. which of the following is the most appropriate clinical intervention?
The opiate toxidrome of miosis and CNS depression, & hypoventilation is frequently followed in the clinical diagnosis of heroin intoxication. QT prolongation has been diagnosed.
What are the uses of oxygen?The energy-producing process that powers the metabolic rates of most living organisms, respiration, depends heavily on oxygen. All living things, including humans, depend on the air that we breath to survive.
What is the ideal oxygen source?The oceans provide roughly a fifth of the oxygen on Earth, and marine life uses a similar proportion. Photosynthetic plankton are abundant in the ocean's top layer. They create more nitrogen than the biggest redwoods, yet being imperceptible to the sight.
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Question 3
A typical atom has about the same number of
electrons, protons
electrons, neutrons
valence shells, neutrons
protons, valence shells
and
Although this state is frequent, atoms do not always have an equal amount of protons and electrons.
What is an atom if it has the same number of protons and electrons?When protons and electrons are distributed equally across an atom, it is said to be electrically neutral. Ions are atoms that have a different ratio of electrons to protons, or vice versa.The number of protons is the same for all atoms of a given element, but the number of neutrons might vary. A carbon atom, for instance, has six protons and typically six neutrons as well. However, certain carbon atoms have more than the typical six neutrons, such as seven or eight.Atoms of the same element always contain the same number of protons, or the same Z, but frequently differ in the number of neutrons they contain, and consequently, in their mass numbers. In the following chapter, the topic of these atoms' isotopes will be covered in further detail.To learn more about electrons refer to:
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If enough of a monoprotic acid is dissolved in water to produce a 0.0152 M solution with a pH of 6.55 , what is the equilibrium constant, Ka, for the acid?
The Ka of the acid is then obtained to be 5.2 * 10^-12 .
What is the equilibrium constant Ka?We have to note that when we dissolve the monoprotic acid in water, we are going to have a weak acid and this weak acid that we have would give us the hydronium ions and the negative counter ions in the monoprotic acid.
We can write that;
Ka = x^2/0.0152 - x
Where x is the concentration of the hydronium ions
If Antilog (-pH) = Concentration of the hydronium ions then;
x = Antilog (-6.55)
x = 2.8 * 10^-7 M
As such
Ka = (2.8 * 10^-7)^2/ 0.0152 - 2.8 * 10^-7
Since x is negligible
Ka = (2.8 * 10^-7)^2/ 0.0152
Ka = 5.2 * 10^-12
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Base your answers to the questions on the two chemical reactions shown. Letter B represents?a. glycerol moleculeb. monosaccharidec. dipeptide moleculed. polymer
Based on the picture, the letter B represents monosaccharide.
Maltose is a carbohydrate compound belonging to disaccharides, namely carbohydrates composed of two monosaccharide molecules. Maltose is a disaccharide that is produced when amylase breaks down starch. It is found in germinating seeds such as wheat. It is also produced when glucose is burned. Maltose is a reducing sugar because it can reduce Fehling, Benedict, or Tollens reagents.
In the figure, there are pores of maltose hydrolysis. Maltose hydrolysis will produce two glucose units using the enzyme maltase catalyst or acid catalyst. So, the hydrolysis of maltose in an acidic environment produces glucose. Glucose is a monosaccharide (simple sugar).
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Does anyone know these answers?
Answer:
Explanation:
Na & I -> NaI (Sodium iodide)Be & Br -> BeBr2 (beryllium bromide)Ca & S -> CaS (Calcium sulfide)Ca & N -> Ca3N2 (Calcium Nitride)Al & P -> AlP (Aluminum phosphide)Al & Te -> AlTe (Aluminum telluride)K & O -> KO (Potassium oxide)Na & S -> Na2S (Sodium sulfide)Sr & Cl -> SrCl2 (Strontium chloride)Sr & S -> SrS (Strontium sulfide)Al & F -> AlF3 (Aluminum fluoride)Mg & S -> MgS (Magnesium sulfide)Rb & Se -> RbSe (Rubidium selenide)Al & O -> Al2O3 (Aluminum oxide)Ba & P -> Ba3P2 (Barium phosphide)It is important to note that these compounds are formed by ionic bonding where the metal atom loses electrons to form a positive ion ( cation) and the non-metal atom gains electrons to form a negative ion (anion). The cation and anion combine to form a neutral compound.Also, the nomenclature of these compounds follow the IUPAC rules, which have a set of conventions to name compounds based on the elements present and their oxidation states, and the number of atoms of each element in the compound.
4. write a complete arrow-pushing mechanism for the following reaction under acid- catalyzed conditions
Acid- catalyzed dehydration of alcohols will yield alkenes.
It is an elimination reaction in which water is removed from a compound. It is important for converting alcohols into alkenes. So acid catalyzed dehydration is the dehydration reaction of alcohols to generate alkene proceeds by heating the alcohols in the presence of a strong acid, such as phosphoric or sulfuric acid, at high temperatures.
During the process of acid-catalyzed dehydration, alcohols will experience either E1 or E2 mechanisms that will result in them losing water and thus forming a double molecular bond. Primary alcohols experience bimolecular elimination called E2 mechanism under this process, while secondary as well as tertiary alcohols experience unimolecular elimination or E1 mechanism.
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which of the following statements correctly describe the relationship between the volume of a chemical system and work? select all that apply. multiple select question. as a gas in the system contracts, the system does work on its surroundings. a chemical system may do work by the expansion of one or more gaseous products. the expansion of a gas can provide mechanical work. the work done by an expanding gas is calculated using the equation w
The best statement which correctly describe the relationship between the volume of a chemical system and work are :
- The expansion of a gas can provide mechanical work
- The work done by an expanding gas is calculated using the equation w = -PdeltaV
-A chemical system may do work by the expansion of one or more gaseous products
A chemical reaction typically involves two types of work: electrical work and work of expansion. By passing an electric current through an external wire, chemical reactions can influence their surroundings. When the volume of the system increases while the reaction is taking place, reactions also have an impact on the environment. The product of the pressure the system expands against and the change in the system's volume yields the quantity of expansion work that the reaction does.
w = PdeltaV -
When a system works on its surroundings, its internal energy diminishes, which is reflected in the equation's sign convention.
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A watershed is an area of land that catches precipitation and drains to rivers and lakes.
Which of the following conclusions can be drawn about the quality of water in the
watersheds of the United States in 2000?
O A. Contaminated water in watersheds is a serious problem around the world.
B. Over 50% of the water in watersheds may pose a health risk.
C. The EPA (Environmental Protection Agency) need not be concerned.
D. More than 75% of the water in the watersheds is dangerously polluted.
E. It is very difficult to analyze water in watersheds.
Answer:
I'm not sure but I think it is B. Over 50% of the water in watersheds may pose a health risk. I'm not sure but I think it is B