Spontaneous movement of molecules and ions from an area of high concentration to an area of low concentration is true.
There are two examples of spontaneous movement: diffusion and osmosis.
Diffusion is spontaneous movement of molecules and ions from an area of high concentration to an area of low concentration.
Osmosis is the spontaneous movement of solvent molecules (in this example water) through a selectively permeable membrane into a region of higher solute concentration (15 percent salt solution), in the direction that tends to equalize the solute concentrations on the two sides.
The direction of osmotic pressure is always from the side with the lower concentration of solute to the side with the higher concentration.
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Identify the pure substance among the following:
sugar
iron ore
sugar solution
saline solution
Answer:
Iron ore
Explanation:
Iron ore is the raw material used to make pig iron, which is one of the main raw materials to make steel
A chemical reaction in which bonds are created is usually associated with ________.
A reaction in which bonds are created is usually associated with the Release of energy.
What are the various types of bonds?
There are three sorts of bonds:
1. Electrovalent or electrovalent bond
2. chemical bond
3. dative bond
Electrovalent or electrovalent bond are formed when one or more electrons are transferred from one atom to another.
Covalent bonds are formed when the atoms during a molecule share an equal number of electrons.
A dative bond is one in which both electrons in a shared pair come from the same atom.
Now, atoms tend to stabilize once they form chemical bonds, releasing energy within the process. Energy is released because there's a higher level of stability associated with a low energy level.
Hence, a reaction in which bonds are created is usually associated with the release of energy.
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How do you prepare 40 ml of a 2 mg/ml protein solution from 10 mg/ml protein solution?
To dilute the concentrated protein solution to make 40mL of a 2mg/mL solution, take 8mL of the concentrated stock and add 32mL of solvent.
What is concentrated protein?Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound). One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom.
An atom's nucleus is made up of electrons, protons, and neutrons. The positive charge of a proton balances out the negative charge of an electron. An atom is in a neutral state if its protons and electrons are equal in number.
They have a mass that is considerably lower, exist outside of the nucleus, and display both wave- and particle-like properties. Since an electron is also a fundamental particle, it is unreinforced and unbroken.
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How much agco is formed when 25.0 ml of 0.200 m agno is mixed with 50.0 ml of 0.800 m naco?
The Ag[tex]_{2}[/tex]CO[tex]_{3}[/tex] is formed when 25.0 ml of 0.200M AgNO[tex]_{3}[/tex] is mixed with 50.0 ml of 0.800 M Na[tex]_{2}[/tex]CO[tex]_{3}[/tex] is 0.68 g.
According the question , the chemical equation is give by :
2AgNO[tex]_{3}[/tex] + Na[tex]_{2}[/tex]CO[tex]_{3}[/tex] -------> Ag[tex]_{2}[/tex]CO[tex]_{3}[/tex] + 2NaNO[tex]_{3}[/tex]
Given that :
volume of silver nitrate = 25.0 ml or 0.025 L
molarity M = 0.200 M
volume of sodium carbonate = 50.0 ml or 0.050 L
molarity = 0.800 M
now, no. of moles of silver nitrate = 0.025 × 0.200 = 0.005 moles
no. of mole of sodium carbonate = 0.050 × 0.800 = 0.04 moles
the no. of moles of silver carbonate , = 0.5 × 0.005
= 0.0025 moles
molar mass of Ag[tex]_{2}[/tex]CO[tex]_{3}[/tex] = 275.7 g/mol
therefor, the mass of Ag[tex]_{2}[/tex]CO[tex]_{3}[/tex] = 0.0025 moles × 275.7 g/mol
=0.68 g
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What is the relationship between events and patterns?
O A. Patterns cause events to occur.
B. Events that happen over and over form a pattern.
C. Events explain how patterns work.
D. Patterns explain what causes events to happen.
The correct answer is Events that happen over and over form a pattern.
An Event is a collection of an experiment's results. Say, for instance, that you throw a coin as part of an experiment. This experiment's result is whether the coin lands "heads" or "tails." These can be regarded as the events related to the experiment. Data repetitions in predictable ways are referred to as patternsPattern helps to understand the trend of occuring event. The general format that an event follows is called the pattern. Pattern cannot exist without a number of events. Events, however, sometimes happen randomly.Pattern doesn't explain the cause of the event.Therefore the correct answer is B. Events that happen over and over form a pattern.
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Pepsin can begin the digestion of protein in the stomach after it is converted from pepsinogen by?
Pepsin can begin the digestion of protein in the stomach after it is converted from pepsinogen by Hydrochloric acid (HCl)
Hydrochloric acid (HCl) converts the pepsinogen to pepsin. It breaks down the proteins into the peptides.
Pepsinogen ------HCl-----> Pepsin
HCl maintains a pH of 2.0 in the stomach.
Pepsin is a digestive enzyme which breaks down the protein in the stomach.
When pepsinogen and hydrochloric acid are present in the gastric juice together, pepsin takes its active form, because HCl is a very strong acid. It denatures the protein. It degrades the extra polypeptide of pepsinogen. This extra polypeptide covers the active site.
Chief cells of gastric regions secretes the enzyme pepsin in an inactive form called pepsinogen. A low pH of 1.5 to 2 activates pepsin.
Pepsin has many uses as it is used in the treatment of indigestion and pancreatitis. It helps in the digestion of food.
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When light waves change direction as they travel from one material to another ________ occurs.
A. Refraction
B. Eclectromagnetic
C. Wavelength
D. Reflect
E. Translucent
Answer:
A. Refraction
Explanation:
Refraction is the redirection of a wave as it passes from one medium to another.
How does the arrangement of atoms or molecules in a gas differ from the arrangements in liquids and solids?
Answer: Gas has loosely packed atoms, liquids have mediumly packed atoms, and solids have tightly packed atoms.
Explanation: Solids have tightly packed atoms which is what keeps them in their defined shape. They have a defined volume and a defined shape.
Liquids have mediumly packed atoms because liquids don't have a definite shape and take the shape of the container they are placed in. It has a definite volume, but an indefinite shape.
Gases have loosely packed atoms because gases can float around anywhere. They don't have a definite volume, and they don't have a definite shape.
2.
A stone has a mass of 1225 g and a density of 65 g/mL. What volume would
it displace if dropped into an overflow can full of water.
If placed into a water-filled overflow, it would displace 18.84 ml.
Why does overflow bother you?Overflowing means to flood something to the point where the liquid spills out the edges. Rivers occasionally exceed their banks after intense downpours, flooding the surrounding area.
Describe density.Density is the measurement of how tightly a substance is packed. It has such definition since it is the mass per unit volume.
Symbol for density: D
Formula for Density: Where is the density, m is the object's mass, and V is its volume, the equation is: = m/V
based on the specified value;
density=65g/ml
mass=1225g
as we know that
D=m/v
so, v=m/d
v=1225/65
=18.84ml
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When you do a load of laundry, why do you not just drop a bar of soap into the washing machine? in other words, why is laundry detergent sold as a liquid or powder?
We use laundry detergent as a liquid or powder because powder and liquid detergents have more enzymes.
What is detergent?
When present in diluted solutions, a surfactant or combination of surfactants has the ability to clean.There are many different types of detergents; one popular family is the alkylbenzene sulfonates, which are soap-like substances that are more soluble in hard water because the polar sulfonate in detergents is less likely to bind to calcium and other ions found in hard water than the polar carboxylate in soap.
Detergents in both powder and liquid form contain additional enzymes and surfactants that break down grease and slime on clothing. Additionally, because the molecules of liquid and powder soaps can move more freely than those of solid bar soap, it is simpler for them to function as nonionic surfactants.
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The organic compounds that are divided into two types, simple and complex, are called _____.
The organic compounds that are divided into two types, simple and complex, are called carbohydrates.
Carbohydrates are diveded into twy types: simple and complex (starches, fiber, glycogen).
Simple carbohydrates are made of one (monosaccaharides) or two sugar units.
Complex carbohydrates are made up of many sugar units.
For example, glucose (C₆H₁₂O₆) is a simple carbohydrate.
Glucose is chemical compound composed of six carbon atoms, twelve hydrogen atoms and six oxygen atoms.
Starch is a polymeric carbohydrate consisting of a large number of glucose units bonded by glycosidic bond. Starch is a white, tasteless and odorless powder that is insoluble in cold water or alcohol.
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B. how much of a 5.0 m naoh solution do you need to add to raise the ph to 6.09?
There are 0.037 NaOH will be needed to raise the pH 6.09.
Henderson equation, convey the pH of a buffer solution as a purpose of the concentration of the weak acid or base and the salt constituents of the buffer.
Formula of Henderson equation
pH = pKa + log10 ([A] / [HA])
Basic buffer has a basic pH and is get ready by blend a weak base and its salt with powerful acid.
According to Henderson equation pH of basic buffer is:
pH + pNaOH = 5.0
6.09 + pNaOH = 5.0
pNaOH = 5.0 - 6.09
pNaOH = log(1.09)
pNaOH = 0.037
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What volume would a 200 g sample of gold have, if its density is known to be 19.3 g/cm³?
Answer:
The volume that a 200 g gold sample would have is 10.36 mL.
Step-by-step explanation:
In this case it is known that the density of gold is 19.3 g / mL. This indicates that in 1 mL there are 19.3 g. Then the following rule of three can be applied: if 19.3 g is contained in 1 mL, how much volume is 200 g of gold?
volume= 10.36 mL
how do metals and nonmetals react with acid
Answer:
Metals react with acids to form hydrogen gas with a pop sound and non metals do not react with acids. This is because a substance undergoing react with acids, donates electrons to the H+ ions produced by the acids. But non metals acceptor of electrons and hence they do not donate to the hydrogen ion of the acid. As a result they don't react with dilute acid but there are some exceptions.
For a polymerization reaction with a termination step, what is the shortest material there in highest concentration?
For a polymerization reaction with a termination step, what is the shortest material there in highest concentration is monomer.
A polymer is a large single chain-like molecule in which the repeating units derived from small molecules called monomers are bound together. process by which monomers are transformed into a polymer is called polymerization. it helps to produce new chemicals like glycogen, cellulose, fatty acids etc. the termination step involves the reaction of a polymer chain radical with another free radical. These three steps constitute the normal step-growth polymerization process. the polymer concentration is associated with solution viscosity, which increases with the increase of the polymer concentration and then leads to a larger fiber diameter. if concentration is too low, continuous polymer fibers cannot be achieved.
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Which receptors and effectors are involved in the refldex action of:{a} blinking of eyes in light spark {b} withdrawal of hand on touching hot object
The receptor in blinking is receptors present in eyes and the effectors are the muscles in the eyes that cause the eye to contract and thereby encourages blinking of eye.
Receptors are the organs responsible for receiving external stimuli and transmitting them to the Central Nervous System. Effectors are the organs that carry out the central nervous system's instructions in response to external stimuli.
All receptors are essentially supplied by sensory nerves that can carry the stimulus to the CNS. Effectors are primarily supplied by motor nerves, which are capable of carrying instructions from the CNS.
Skin, eye, ear, nose, and tongue are all examples of receptors. Effectors are either muscles or glands.
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Which is true about UVA and UVB rays?
A. Both rays can be blocked 100% by sunscreen
B. UVA protects the surface, UVB protects beneath the surface
C UVB rays cause burning, UVA rays cause premature aging
D. UVA rays cause burning, UVB rays cause premature aging
Answer: C. UVA rays cause premature aging and UVB rays cause burning
Explanation: Ultraviolet radiation causes DNA changes in the skin, leading to premature aging and skin cancer. There are three kinds of UV light: UVA light. This form of solar radiation damages skin at all levels—from the surface layer (epidermis) down deep into the dermis.
Where corrosion protection is necessary and the conduit is threaded in the field, the threads must be coated with a(n) ______, electrically conductive, corrosion-resistance compound.
Where corrosion protection is vital and the conduit is threaded in the field, the threads must be coated with a(n) Approved electrically conductive, corrosion-resistance compound.
What is corrosion protection?
A corrosion protection method may be a technique used to minimize corrosion such as the application of anti-corrosion coating, cathodic protection, or other methods that make metal resistant to corrosion.
Metal corrosion in most situations is usually slowed, managed, or maybe put to a stop utilizing the right techniques.
What does one mean by corrosion?
Corrosion may be a natural process which converts refined metal to their more stable oxide.It is the gradual destruction of materials {usually metals} by chemical reaction with their environment.In the most common use of the world, this suggests electrochemical oxidation of metals in reaction with an oxidant such as oxygen.
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If the initial concentration of so2cl2so2cl2 is 0.150 mm , what is the concentration of so2cl2so2cl2 after 190 ss ? [so2cl2]t[so2cl2]t = 1.13 mm submitprevious answersrequest answer
Use integrated first order rate law, which give you the concentration of reactant sulfuryl chloride as function of time t:
ln[SO₂Cl₂] = ln[SO₂Cl₂]₀ - k∙t
([SO₂Cl₂]₀ i the initial concentration and k is the rate constant)
=> [SO₂Cl₂] = e^(ln[SO₂Cl₂]₀ - k∙t) = e^(ln[SO₂Cl₂]₀) ∙ e^( - k∙t)
= [SO₂Cl₂]₀ ∙e^( - k∙t)
The decomposition of SO₂Cl₂ follows the reaction equation
SO₂Cl₂ → SO₂ + Cl₂
So per mole of sulfuryl chloride disappeared one mole of sulfur dioxide is formed. Hence the changes in concentrations of these compounds are related as:
-∆[SO₂Cl₂] = ∆{SO₂] <=> [SO₂Cl₂]₀ - [SO₂Cl₂] = [SO₂] - [SO₂]₀
Assuming there was initially no sulfur dioxide you get for its concentration:
[SO₂] = [SO₂Cl₂]₀ - [SO₂Cl₂]
= [SO₂Cl₂]₀ - [SO₂Cl₂]₀ ∙e^( - k∙t)
= [SO₂Cl₂]₀ ∙(1 - e^( - k∙t))
after 210s starting with 0.150M of [SO₂Cl₂]
[SO₂]= 0.150M ∙(1 - e^( - 1.48×10⁻⁴s⁻¹k ∙ 240s) =
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formula for chlorine reacting with lithium and carbon
The specific heat of ethanol is 2.46 J/gºC. Find the heat energy required to raise the
temperature
of 193 g of ethanol from 19°C to 35°C
The correct answer is 7596.5 Joules of heat energy is required to raise the temperature of 193 g of ethanol from 19°C to 35°C.
The amount of heat required is calculated as follows:
Q = mC∆T
m = mass =193g of ethanol
C = specific heat = 2.46J/g°C
∆T = T f-Ti = 35-19°C = 16°C
Q = 193g *2.46J/g°C *16°C
Q = 7596.5 J
We are interested in the value of Q, which is the quantity of heat. We would use the equation Q = mCΔT to do so. mass and specific heat are known; using the initial and final temperatures, the T can be calculated. Once we know three of the four quantities in the relevant equation, we can substitute and solve for Q. The amount of heat energy required to raise the temperature of a substance is referred to as its specific heat energy.
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Given the following electronic configuration of a neutral atom: [ar]4s13d10 , what is the element and the number of unpaired electrons in its ground state?
The given element has 18(Ar)+1+5=24 electrons i.e., the element is Cr. Thus the Cr atom has 6 unpaired electrons.
What is electronic configuration?In atomic physics and quantum chemistry, the electron configuration refers to how an atom's or molecule's electrons are arranged in their respective orbitals.
The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also known as electronic structure or electron configuration.
The electron configuration is used to describe an atom's ground state orbitals, but it may also be used to depict an atom that has ionised into a cation or anion by making up for any lost or gained electrons in the orbitals after it.
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The given element has 18(Ar)+1+5=24 electrons i.e., the element is Cr.
Thus the Cr atom has 6 unpaired electrons.
What's electronic configuration?
In atomic physics and quantum chemistry, the electron configuration refers to how an atom's or molecule's electrons are arranged in their respective orbitals.The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also referred to as electronic structure or electron configuration.
Why is electronic configuration?Commonly, the electron configuration is employed to describe the orbitals of an atom in its ground state, but it also can be used to represent an atom that has ionized into a cation or anion by compensating with the loss of or gain of electrons in their subsequent orbitals.
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The molecular weight of ethanol ( c2h5oh ), the alcohol in alcoholic beverages, is ________ amu (rounded to one decimal place). 46.1 45.1 9.0 29.0 26.0
The molecular weight of ethanol, in the alcohol in alcoholic beverage, is 46.1 amu.
What is ethanol?
Ethanol is a substance derived from organic compounds. With the chemical formula C2H6O, it is an alcohol. EtOH, its chemical name, is also occasionally abbreviated as CH3CH2OH or C2H5OH. Alcohol is a highly flammable, colorless liquid with a strong wine-like odor and astringent flavor.
Pharmaceuticals, polymers, lacquers, polishes, plasticizers, and cosmetics are all made with ethanol. Ethanol is used in medicine as an antidote for methanol or ethylene glycol intoxication as well as a topical anti-infective.
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What multiplicities are observed for the signals in the off-resonance decoupled 13c nmr spectrum of 2-chloropropene?
A singlet, a triplet, and a quartet multiplicities are observed for the signals in the off-resonance decoupled 13c NMR spectrum of 2-chloropropene.
A phenomenon in which an external force or vibrating system causes another system around it to vibrate with greater amplitude at a particular operating frequency. The concept of resonance would be difficult to understand without an example. The resonance energy is defined as the difference between the electronic energy of the real (conjugated) molecule and the virtual Kekulé structure in which the bond is localized.
Resonance occurs when the frequency of the applied force is equal to one of the natural frequencies of vibration of the forced or driven harmonic oscillator. Swings, guitars, pendulums, bridges, and musical systems are examples of resonance in everyday life.
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A 20.00 g mixture of magnesium and zinc metal reacting with excess hydrochloric acid produced 1.152 g of hydrogen gas. what is the percent zinc in the original mixture?
percentage of zinc= 5.985/20 X 100= 29.5%
let x represents zinc and y be magnesium so
Zinc(s) + 2HCl(aq) -----> ZnCl2(aq) + H2(g)
Mg(s) + 2HCl(aq) -----> MgCl2(aq) + H2(g)
1.152 g of hydrogen gas=( x/65.3 + y/24.305) 20
= 3.08 x10^-2 + 0.8295-8.30
=x=5.985
y= 4.015
percentage of zinc= 5.985/20 X 100= 29.5%
The hydrogen gas escapes, so the two products of Zinc Chloride and Magnesium Chloride will then react with Silver Nitrate. Again, I combine both of the reactions
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3. A screwdriver has the density of 6.8 grams per cubic centimeter (g/cm³). It also has the mass of 5.3
grams (g). What is the screwdrivers volume?
Density is defined as mass of the given matter divided by its volume
it's SI unit is kg/m³
given, density = 6.8 grams per cubic centimeter (g/cm³)
mass = 5.3 grams (g).
D = M ÷ V
V = M ÷ D
V = 5.3 ÷ 6.8
V = 0.77941 g/cm³
density is a physical property.helium is less dense than air while carbon dioxide is more dense than airWhen we heat up an object normally we observe that , they increase in volume, and their density decreases.Temperature greatly affects volume. As temperature increases, the volume of most solids and gases increases which directly impacts densityTo know more about density visit :
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3. Which of the following statements about matter is FALSE?
O Matter can be classified as an element and a mixture.
O Matter is anything that occupies and has mass.
O Matter exhibits two types of change: physical and chemical.
O Mafter refers to everything that makes up the entire universe.
Matter can be classified as element and mixture is a false statement.
Physical and chemical qualities are present in all matter. Physical qualities, such as mass, color, and volume, are characteristics that may be measured by scientists without modifying the makeup of the sample being studied (the amount of space occupied by a sample). Chemical characteristics, such as flammability and susceptibility to corrosion, define a substance's distinctive capacity to reacted to generate new substances. A pure substance's chemical and physical properties are the same in all samples. For instance, pure copper always forms a solid that is reddish-brown in color and dissolves in diluted nitric acid to form a blue solution and a brown vapor (a chemical property).
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Match the definitions with the provided vocabulary words:
The term measurement has to do with the process of obtaining the value of a quantity. There are several units that could be used in measurement but the SI unit is the internationally accepted unit of measurement.
Let us now match the words and the vocabulary;
The quantity includes a decimal determined y the device or instrument - UncertaintyInternational units that are globally accepted - SI unitObservations that are subjective and not numerical - Qualitative dataThe beginning of a word that tells you the multiplier needed - metric prefixHow close your measurement is to your other measurements - precisionThe quantity is a whole number that can be counted - exact numberObservations that are objective and numerical - quantitative dataHow close your measurement is to the true value - AccuracyThe ratio of the absolute error to the accepted true value - percent errorA range of values that includes the true value and is affected by the measuring device - uncertaintyLearn more about error:https://brainly.com/question/19575648
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If a resident drinks four ounces of water with a meal, how many milliliters (ml) has he consumed?
If a resident drinks four ounces of water with a meal, 120 mL has he consumed.
Water is a clear, thin liquid that, in its pure state, has no color or taste. Rain falls from the clouds and flows into rivers and oceans. All animals and humans need water to live. Give me a glass of water. Essential water requirement means the minimum amount of water required for residential and commercial purposes for food processing, drinking, flushing toilets, firefighting, and hospital use.
Store at room temperature. Lubricate and moisten the joints. Protects the spinal cord and other delicate tissues. Removes waste products from urination, perspiration and bowel movements. Most tap water in the United States comes from surface or groundwater. Spring water refers to bodies of water (rivers, streams, lakes, reservoirs, springs, groundwater, etc.) that feed public drinking water supplies or private wells.
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ASAPP!!! CHEM HW HERE