Hydrogen peroxide used as a 6% solution is used to easy wounds on pores and skin as an antiseptic ,and it is also used as a stronger answer (>30%) as an antimicrobial agent and an oxidizing agent.
Hydrogen peroxide (H2O2) is a topical antiseptic utilized in wound cleaning which kills pathogens through oxidation burst and nearby oxygen manufacturing. H2O2 has been said to be a reactive biochemical molecule synthesized by means of various cells that impacts biological behavior thru multiple mechanisms: alterations of membrane potential, technology of latest molecules, and changing intracellular redox balance, which leads to activation or inactivation of different signaling transduction pathways.
As an disinfectant, it additionally treats wounds. Hydrogen peroxide capabilities as an oxidizing element in personal care merchandise, which includes colorants and toothpastes, and gives a lightening/whitening impact.
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5. Kinetic and potential energy both relate to:
a. Heat
b. Light
c. Motion
Answer:
C. Motion
Explanation:
Potential energy is the energy stored within an object.
Kinetic energy is the energy an object posesses due to its motion.
Rick is a biologist who hypothesized that squid would swim faster in warm water than in cold water. rick conducted his experiment. he discovered that squid swim at the same rate in warm and cold temperatures. what should rick do next?
Scientific investigations can be used to reach the solution to the problem. The hypothesis of the experiments can be performed and the results and findings should be reported. Thus, option A is correct.
What is Scientific investigation?Scientific investigations have been defined as the series of steps that are used to solve the question and test the hypothesis to reach the solution. It uses logical means to experiment and research the topic.
After conducting an experiment the observed data, results, and findings must be reported so the process and the technical results can be used to define the issue or the problem that acts as a conclusion.
Therefore, option A. Rick must report his findings.
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Your question is incomplete, but most probably your options were,
A. Report his findings.
B. Throw away his experiment notes.
C. Report that squid swims faster in warm water.
D. Change his hypothesis.
A chemist tests the quality of a brand of soft drink. which branch of chemistry might the chemist use?
A chemist tests the quality of a brand of soft drink. The branch of chemistry he might use out of Analytical chemistry, physical chemistry, biochemistry, organic chemistry, and inorganic chemistry is analytical chemistry.
What are the branches of chemistry?
Analytical chemistry, physical chemistry, biochemistry, organic chemistry, and inorganic chemistry are thought to constitute the five main branches. The study of compounds of carbon and itself is called organic chemistry. The study of substances not included in organic chemistry is known as inorganic chemistry. The study of matter's chemistry and the creation of instruments to quantify matter's properties are both aspects of analytical chemistry. The field of chemistry known as "physical chemistry" uses physics to the study of chemical reactions. This often involves using thermodynamics and quantum mechanics to research chemistry. The study of chemical reactions that take place within living things is known as biochemistry.
Thus, the branch of chemistry a chemist uses to test the quality of a brand of soft drink is analytical chemistry.
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What is the percent yield of koh when 22.4 grams of ko2 reacts with an excess of water to produce 13.9 grams of koh?
The percent yield of KOH is 78.7%.
Balanced chemical reaction:
4KO₂ + 2H₂O → 4KOH +3O₂
m(KO₂) = 22.4 g; mass of the oxide
m1(KOH) = 13.9 g; mass of the potassium hydroxide produced
n(KO₂) = 22.4 g ÷ 71.1 g/mol
n(KO₂) = 0.315 mol; amount of the oxide
From chemical reaction: n(KO₂) : n(KOH) = 1 : 1
n(KOH) = 0.315 mol; amount of the potassium hydroxide
m(KOH) = 0.315 mol x 56.1 g/mol
m(KOH) = 17.67 g; a theoretical yield of KOH
the percent yield = 13.9 g / 17.67 g x 100%
the percent yield = 78.7%
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Nitrogen gas is the major component of air. a sample of nitrogen gas in a glass bulb weighs 243 mg. what is this mass in si base units of mass (kilograms)?
Nitrogen gas is the major component of air. a sample of nitrogen gas in a glass bulb weighs 243 mg. 2.43 × 10-4 kg is this mass in si base units of mass (kilograms).
Nitrogen, or N, using its scientific abbreviation, is a colorless, odorless element. Nitrogen is in the ground under our feet, in the water we drink, and in the air, we breathe. In fact, nitrogen is the most abundant element in the Earth's atmosphere, with approximately 78% of the atmosphere being composed of nitrogen.
Nitrogen is commonly used during sample preparation for chemical analysis. Used to concentrate and reduce the volume of liquid samples. Nitrogen is also important for the chemical industry. It is used in the production of fertilizers, nitric acid, nylon, dyes, and explosives*. Exposure to very high concentrations of pure nitrogen can cause dizziness, drowsiness, displacing oxygen from the air, unconsciousness, and death.
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What is the name for a material with a free electron in its valence ring that allows electricity to flow freely?
Answer:
conductor
Explanation:
A person's heartbeat is 80 beats per minute. if his/her heart beats 3.1e9 times in a lifetime, how long (in whole years) does the person live? disregard leap years.
The person will live 73.62 years
The heartbeats 80 times in 1 minute
Therefore , 1 heartbeat takes [tex]1/80 minutes[/tex] time
In whole life number of heartbeats = [tex]3.1* 10^{9}[/tex]
Thus, time in which [tex]3.1* 10^{9}[/tex] heart beat will occur = [tex]3.1* 10^{9} * 1/80 minutes[/tex]
= [tex]0.03875 * 10^{9}[/tex] minutes
Since 1 minutes =[tex]1.90259 * 10^{-6}[/tex] year
Therefore, [tex]0.3875 * 10^{9}[/tex] minutes = [tex]0.03875 * 10^{9}[/tex] * [tex]1.90259 * 10^{-6}[/tex] year
= [tex].073625* 10^3[/tex] years
= 73.62 years
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A 0.50-quart jar contains 2.0 pounds of honey. what is the density of the honey in g/ml?
A 0.50-quart jar contains 2.0 pounds of honey. 1.9 g/ml is the density of the honey.
Population density (in agriculture, forest stand, or plant density) is a measure of population per unit area or, exceptionally, per unit volume. It is a quantity of type number density. It applies to living things in general, mainly humans. It's an important geographical term. Simply put, population density is the number of people living per square kilometer.
Urban populations, especially urban areas, strongly depend on the definition of "urban area" used. It is almost always denser only in the center than when it includes suburban settlements and intervening rural areas, such as agglomerations and metropolitan areas. Area (the latter may include neighboring cities).
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change into symbols
When lithium hydroxide pellets are added to a solution of sulfuric acid (H2SO4), lithium sulfate and water are formed.
Li₂SO₄+2H₂O is the result of the balanced chemical reaction, which is 2LiOH+H₂SO₄.
A balanced chemical reaction is what?A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
Consequently, the balanced chemical equation is; For a balanced chemical reaction, the number of atoms of a given element on the left hand side should match the number of atoms of that element on the right hand side.
2LiOH+H₂SO₄ → Li₂SO₄+2H₂O
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What type of molecule is shown below?
Answer:
It is an alkene
Explanation:
First, this is a hydrocarbon because it has only carbons and hydrogens. Second, we see the C=C which is a double bond. Double bonds between carbons make it an alkene.
how many grams of iron will be needed to react completely with an excess of oxygen to form 40 grams of iron oxide ?
Answer:
28g Fe
Explanation:
source: https://www.answers.com/Q/How_many_grams_of_iron_will_be_needed_to_react_completely_with_an_excess_of_oxygen_to_form_40_grams_of_iron3_oxide
Question 2 of 10
An 85.0 kg man playing hockey catches a puck moving at 25.0 m/s. The man
is initially at rest. The man and the puck move together after the collision. The
puck's mass is 0.16 kg. What is the final velocity?
A. 0.05 m/s
B. 13.6 m/s
C. 4.00 m/s
D. 1.00 m/s
SUBMIT
Explanation:
Using the law of the conservation of linear momentum P:
P_i = P_fP
i
=P
f
so:
M_mV_{mi}+M_pV_{pi} = M_sV_sM
m
V
mi
+M
p
V
pi
=M
s
V
s
where M_mM
m
is the mass of the man, V_{mi}V
mi
is the initial velocity of the man, M_pM
p
is the mass of the puck, V_{pi}V
pi
is the initial velocity of the puck, M_sM
s
is the mass of the puck and the man and V_sV
s
is the velocity of both after the collition.
Replacing values, we get:
(80kg)(0m/s)+(0.17kg)(20m/s) = (80kg + 0.17kg)V_s(80kg)(0m/s)+(0.17kg)(20m/s)=(80kg+0.17kg)V
s
Finally, solving for V_sV
s
:
V_sV
s
=0.0424m/s
Identify items that can be used to control the boiling when heating liquid in a round bottom flask.
The items can be used to control the boiling when heating liquid is in a round bottom flask are boiling chips or stones,a stir bar and stir plate.
What is Boiling?
When a liquid is heated to its boiling point, which is the temperature at which the vapour pressure of the liquid equals the pressure placed on it by the surrounding atmosphere.
Because they provide even boiling and stop the solution from boiling over, boiling stones are very helpful in chemical labs. These chips are designed to be porous in order to permit the formation of solvent vapors in the air cavities.
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Acetylcholine binds to receptors on muscle fibers which open ion channels (allowing ions to move along their concentration gradient), what type of transport is this an example of?
Acetylcholine binds to receptors on muscle fibers which open ion channels (allowing ions to move along their concentration gradient). This is an example of passive transport.
Passive transport is a biological phenomenon of movement that does not require external energy from the cell. It is the movement of ions or other chemical substances within the cells.
This movement happens along the concentration gradient. The chemical substance moves from high concentration to low in this phenomenon. simple and facilitated diffusion that happens in the cell are also types of passive transport. Other than that, passive transport also includes Filtration and Osmosis.
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How many isomers of which type can be drawn to represent the chemical formula c5h12?.
3 structural isomers can be drawn to represent the chemical formula C5H12.
When two or more organic compounds have the same molecular formula but different structures, they are said to be structural isomers, also referred to as constitutional isomers. The two molecules below share the same chemical formula, however they are distinct due to variations in the methyl group's placement.
It is an alkane, C5H12. There are 2 to the power (n-4)+1 isomers of an alkane, where n is the number of carbon atoms. Therefore, there are three structural isomers that might exist for C5H12 using the formula. They are methyl butane, n-pentane, and isopentane (dimethyl propane).
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Which is the best carbon-14 radioisotope-labeled compound to add to a cell culture as a means for tracking the products of transcription?
Best carbon-14 radioisotope-labeled compound to add to a cell culture as a means for tracking the products of transcription 14C ribose.
Carbon-14, the longest-lived radioactive isotope of carbon, whose decay allows the accurate dating of archaeological artifacts. C-14 is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.it is mostly found in atmospheric carbon dioxide because that is where it is constantly being produced by collisions between nitrogen atoms and cosmic rays.
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Describes the type of covalent bond found between oxygen and kydrogen in water molecules
Polar covalent bonds are the type of covalent bond found between oxygen and hydrogen in water molecules
Water is a Polar Covalent Molecule
The choppy distribution of electrons among atoms and the uneven form of the molecule way that the water molecule has poles - a superb price at the hydrogen pole (side) and an oxygen Negative price at the poles (flanks)).
A water molecule includes hydrogen atoms covalently bonded to the equal oxygen atom. Oxygen atoms are electronegative and entice covalent electrons in covalent bonds.
The bond among the oxygen and hydrogen atoms withinside the water molecule is a polar covalent bond. H. Electrons aren't shared similarly among oxygen and hydrogen. Oxygen has a better affinity for electrons than hydrogen.
A polar covalent bond is a bond wherein the electron pairs are shared similarly among the 2 bonding atoms, and a polar covalent bond is a bond wherein the electron pairs are shared unequally among the 2 bonding atoms. Polar bonds are a result of variations in electronegativity.
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HELP!! ASAP!! PLEASE!!
The pictured compound has which bond?
C = C and C −H
uppercase C double bond uppercase C and uppercase C single bond uppercase H,
C −Cand C −H
uppercase C single bond uppercase C and uppercase C single bond uppercase H,
C = C and C −C
uppercase C double bond uppercase C and uppercase C single bond uppercase C,
C −C, C −H, and C −O
The bonds that are present in the pictured compound are C −C and C −H.
What is a bond?A bond is that which connects two atoms together. We know that a compound is composed of bonds. There are a number of bonds in a compound. The bonds are always as many as the atoms that need to be linked in the compound.
We know that butane a shown in the image is an alkane. An alkane has carbon - carbon and hydrogen - carbon bonds. There are no multiple bonds in the compound butane.
Thus, the bonds that are present in the pictured compound are C −C and C −H.
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Describe how you could use anhydrous cobalt chloride to test that a colourless
liquid was water. State what you would do and what observations you would
look for.
The anhydrous cobalt chloride is blue in color and it absorbs water, on reaction with water it turns pink in color.
What is chemical reaction?A chemical reaction is defined as a process that lead to chemical transformation of one set of substances to another set.
There are basically four types of chemical reactions.
Synthesis reactionDecomposition reaction Single replacement reaction Double replacement reactionThe reaction between anhydrous cobalt chloride and water is also one of the chemical reaction.
Thus, anhydrous cobalt chloride is blue in color and it absorbs water, on reaction with water it turns pink in color.
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How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons?
About a century ago, in 1911, Rutherford discovered the atomic nucleus, then in 1919, he witnessed the proton.
For a long time, people believed that Atom was the final particle and the building block of every other component in the universe. However, in the year 1911, Rutherford's atomic model depicting the presence of nucleus shattered the argument that atom is the ultimate unbreakable particle.
Rutherford's experiment also approved that there must be more than just protons in the nucleus. For example, it was previously known that helium had an atomic number of 2, but a mass number of 4.
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what are the frequency of a photon with a wavelength of 360 nm. report your answers to three significant digits.
The frequency of a photon with a wavelength of 360 nm frequency of a photon is 8.33 × 10¹⁴ s⁻¹.
Given,
The wavelength of photon = 360 nm or 3.60 × 10⁻⁷
three × 10⁸ m/s is the speed of mild.
We need to discover the frequency of a given photon.
The frequency of a photon is described as the wide variety of waves that pass via a set point in a unit of time.
therefore, f = c/λ
where f is the frequency, c is the velocity of light, and λ is the wavelength of the photon.
f = 3 × 10⁸/ 3.60 × 10⁻⁷
Or, f = 0.8333 × 10¹⁵ s⁻¹
Or, f = 8.33 × 10¹⁴ s⁻¹
Hence, the frequency of the photon is 8.33 × 10¹⁴ s⁻¹.
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The foreign substance responsible for causing an allergic reaction is called a(n):______.
The foreign substance responsible for causing an allergic reaction is called an allergen.
The exaggerated reaction of our body’s immune system to certain foreign substances is known as an allergy.
The symptoms of allergy are sneezing, watery eyes, running nose, and difficulty in breathing which occur due to the release of certain chemicals like histamine and serotonin in our body.
The foreign substance that causes allergy is called an allergen.
Common examples of the allergens are pollen grains of certain plants, animal dander, and food items like peanuts, mushrooms etc.
To control the symptoms of allergy, drugs like antihistamines and steroids are used.
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Which reaction best illustrates the behavior of the weak base h2po4- in aqueous solution?
The reaction best illustrates the behavior of the weak base h₂po₄- in an solution is:H₂PO₄ (aq) + H₂O (l) ↔ H₃PO₄ (aq) + OH- (aq)
What is a weak base?
A weak base is a base that, upon dissolution in water, doesn't dissociate completely, therefore the resulting aqueous solution contains only a small proportion of hydroxide ions and the concerned basic radical and a large proportion of undissociated molecules of the base.
Contents 1 pH, Kb, and Kw 2 Percentage protonated 3 A typical pH problem.
Examples of Weak Bases.
Ammonia (NH₃) Ammonia could also be a chemical compound with the formula NH ₃. it is a weak base which exists as a colour less gas under standard conditions for ...
2 Trimethylamine (N (CH₃) ₃)₃ Pyridine
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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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What is the relationship between the amount of deflection and the mass of the isotope.
Explanation:
The degree of deflection directly relates to the mass of the ion: the lighter the ion, the greater the deflection and the heavier the ion, the lesser the deflection. The beam of ions is then detected
and the relative abundance of each isotope of an element canthen be determined.
please mark as brainliest
The greater the mass of the isotope lesser will be the amount of deflection. The amount of deflection is related to the mass of the isotope.
What is isotope ?An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties.
As each isotope has a different mass number, this number is written after the element name for the atom. For example, an atom of carbon with a mass number of 12 will be labeled as an atom of carbon-12. Carbon-13 and carbon -14 is also examples of carbon atom.
Thus, the greater the mass of the isotope lesser will be the amount of deflection. Deflection is depend upon the mass of atom.
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Question 13 (1 point)
How many grams of nitrogen are contained in 70.0 g of C6H5NO3 (MW- = 139.1094 u)?
a) 7.05 g of nitrogen
Ob) 8.11 g of nitrogen
Oc) 7.11 g of nitrogen
d) 8.05 g of nitrogen
2
The mass of nitrogen contained in 70.0 g of C6H5NO3 is 7.05g.
How to calculate mass of an element in a compound?The mass of an element in a compound can be calculated by dividing the molar mass of the element by the molar mass of the compound multiplied by the mass of the compound.
According to this question, 70.0 g of C6H5NO3 is contained in a substance.
Molar mass of nitrogen is 14g/mol
Mass of nitrogen = 14g/mol/139.11g/mol × 70g
mass of nitrogen = 7.05g
Therefore, the mass of nitrogen contained in 70.0 g of C6H5NO3 is 7.05g.
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A sample of ethanol (c2h5oh) contains 4.2x10^23 hydrogen atoms. how many c2h5oh molecules are in this sample?
There are 7.0 x 10^22 C2H5OH molecules in the sample.
Ethanol (also referred to as ethyl alcohol, grain alcohol, consuming alcohol, or actually alcohol) is an organic chemical compound. It is simple alcohol with the chemical system C2H6O. Its method can be also written as CH3−CH2−OH or C2H5OH (an ethyl team linked to a hydroxyl group) and is regularly abbreviated as EtOH. Ethanol is a volatile, flammable, colorless liquid with an attribute wine-like odor and pungent taste. It is a psychoactive drug, a leisure drug, and an energetic ingredient in alcoholic drinks.
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You have 10.0 g each of na, c, pb, cu and ne. which contains the largest number of moles?
Carbon (C) contains the largest number of moles.
Number of Moles of a substance can be defined as the ratio of given mass of the substance to the Molecular Mass of the substance.
We can write,
Number of moles = Given Mass / Molecular Mass euation1
Given Mass of Na, C, Pb, Cu, Ne each = 10.0g
Molecular mass of Na = 22.9898 u
Molecular mass of C = 12u
Molecular mass of Pb = 207.2u
Molecular mass of Cu = 63.546 u
Molecular mass of Ne = 20.1797 u
After substituting the values of molecular mass and given mass of elements in equation1 , we will get
Number of moles of Na = (10/22.9898) = 0.4350
Number of moles of C = (10/12) = 0.8333
Number of moles of Pb = (10/207.2) = 0.0483
Number of moles of Cu = (10/63.546) = 0.1574
Number of moles of Ne = (10/20.1797) = 0.4955
So, we can clearly see that Carbon contains the largest number of moles.
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Adding earthworms to a compost pile typically increases the rate at which the organic
matter in the pile decomposes. A learner wonders whether adding other organisms to the
compost pile will have a similar effect on the rate of decomposition. She decides to an-
swer this question by performing an experiment.
Formulate a valid hypothesis that the learner could test in her experiment.
Based on this hypothesis, identify the independent variable and dependent variables for the
learner's experiment.
..
.
Compost
In the experiment performed on the compost:
A valid hypothesis for this experiment is: Adding living organisms to compost increases its rate of decomposition.The independent variable are the types of living organisms added to the compostThe dependent variable is the rate of decomposition of compostWhat is are variables in an experiment?Variables in an experiment are factors that are under the control of the researcher and which brings about changes in the result of the experiment.
There are three types of variables in an experiment, they are;
Independent variableDependent variableConstant variableThe independent variable is the variable which affects the result of the experiment by controlling the dependent variable.
The dependent variable changes as a result of changes in the independent variable.
The constant variable is kept constant or unchanged by the researcher.
Considering the experiment performed on the compost:
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The ph scale is based on the number of ________ in solution.
a) protons
b) neutrons
c) hydroxyls
d) electrons
The ph scale is based on the number of hydroxyls in the solution.
What are hydroxyls?
Chemistry and biochemistry both use the hydroxy group extensively. The chemical product generated on the largest industrial scale, sulfuric acid, among many other inorganic substances, contains hydroxy groups.
In the dehydration events that form lengthy chains out of simple biological molecules, hydroxy groups take part. A fatty acid's carboxy terminus loses its OH group when it is joined to glycerol to create a triacylglycerol. The carboxy group at the aldehyde end of one sugar loses its OH group when two aldehyde sugars are joined to create a disaccharide. The carboxy group of one amino acid loses the OH when a peptide bond is formed to join two amino acids to form a protein.
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