In contrast to the worldwide recycling of chemical elements, energy travels via ecosystems.
An ecosystem is a region where a bubble of life is created by plants, animals, and other organisms interacting with the weather, environment, and other factors. Abiotic variables, or nonliving components, coexist with biotic components in ecosystems.
The food chain and food web are used to transfer energy. Plants, who are the primary energy providers in the ecosystem, use their chloroplasts to collect sunlight, which is then partially converted into chemical energy during photosynthesis.
Joules or calories are used to measure the energy input, or the energy that enters the environment. As a result, the energy flow is sometimes referred to as the calorific flow.
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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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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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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.
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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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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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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How does a magnetic field change as you move away from a magnet? At what point does it end?
Answer:
The strength of the magnetic field is inversely proportional to the distance from the current carrying conductor. That is, as the distance increases the magnetic field decreases.
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Air flows according to differences in thermal energy.
If a warm air mass is located in the southwest United States and a cold air mass is located in the southeast United States, from which direction will the winds blow?
south
north
west
east
IT WAS WEST
The wind is going to move to the west due to convection.
Why would the wind blow west?We have to know something about the convection current of a fluid. Let us note that when convection is taking place, there would be the movement of the warm fluid upwards while the cool fluid would move downwards.
We are told that a warm air mass is located in the southwest United States and a cold air mass is located in the southeast United States.
This is why there would be the movement of the warm air mass towards the west and this is due to the convection of the air mass as discussed here.
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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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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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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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nucleic acids (dna and rna) are polymers of nucleotides. the structural backbone of nucleic acids contains the following repeating pattern:
Nucleic acids (DNA and RNA) are polymers of nucleotides, the structural backbone of nucleic acids contains "Phosphate - Sugar - Phosphate - Sugar'' repeating pattern.
In both RNA and DNA, every nucleotide has the same basic structure. This structure consists of a phosphate group that is bonded to a pentose sugar via a phosphodiester bond and that is then connected to an organic base.
Ribose is found in RNA, and deoxyribose is found in DNA. Both of these sugars are pentoses. In DNA, the organic bases are A, G, C, and T; in RNA, they are A, G, C, and U. (adenine stands for adenine, guanine for guanine, cytosine for cytosine, thymine for thymine, and uracil for uracil). The structural backbone of nucleic acids contains "Phosphate - Sugar - Phosphate - Sugar'' repeating pattern.
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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
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.
Below are some of the molecular orbitals for benzene. How many vertical nodal planes are there in each?
There are two vertical nodal planes in each of the molecular orbitals for benzene.
Molecular orbitals of benzeneThe molecular orbitals of benzene are composed of overlapping p orbitals of the carbon atoms. These molecular orbitals include:
The highest occupied molecular orbital (HOMO)The lowest unoccupied molecular orbital (LUMO)Each of these molecular orbitals contains two vertical nodal planes, which are planes of zero electron probability that divide the orbital into two lobes. The vertical nodal planes occur perpendicular to the plane of the hexagonal ring of benzene, and they separate the two lobes of the orbital. The two lobes are of equal size, and they are located on opposite sides of the nodal plane. As a result, the two vertical nodal planes form a cross-sectional cut of the molecular orbital.
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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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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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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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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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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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Explain why the name shown below is incorrect for the compound MgCl,?
Name: Magnesium Dichloride
The name "Magnesium Dichloride" is incorrect for the compound MgCl2 because the compound is not composed of magnesium and chlorine only in a 1:1 ratio. The compound is actually composed of one Magnesium atom (Mg) and two Chlorine atoms (Cl2).
The correct name for the compound MgCl2 is Magnesium Chloride, which describes the chemical formula accurately. The prefix "di-" refers to two atoms and is used when there are two atoms of the same element in a compound, In this case, there are two chlorine atoms in MgCl2.
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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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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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?
_______ 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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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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we can remember swimming in december, heading for the city lights in 1975, we share in each other, nearer than farther, the scent of a lemon drips from your eyes we are the people that rule the world. a force running in every boy and girl, all rejoicing in the world, take me now, we can try. we lived an adventure loved in the summer, followed the sun till night reminiscing other times of life, for each every other the feeling was stronger, the shock hit eleven got lost in your eyes i can't do well when i t
"We Are The Sun". Child looking at the moon. Just looks like the sun. These are the days. Some things don't change.
Summer, followed the sun till night reminiscing other times of life?
The song was also used in the 2011 films The Roommate and Hall Pass, as well as in episode 11 of season 6 of Entourage.Based on J. G. Ballard's autobiographical novel, tells the story of a boy, James Graham, whose privileged life is upturned by the Japanese invasion of Shanghai, December 8, 1941. Separated from his parents, he is eventually captured, and taken to Soo Chow confinement camp, next to a captured Chinese airfield.Empire of the Sun are an Australian electronic music duo formed in 2007. The duo is a collaboration between Luke Steele, of alternative rock band The Sleepy Jackson, and Nick Littlemore, of electronic dance band Pnau.
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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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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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