Chlorhexidine and alexidine are: used in mouthrinses and are effective against plaque formation.
Chlorhexidine is a disinfectant and antiseptic. It is used for preventing dental plaque, treating yeast infections of the mouth and cleaning wounds.
Chlorhexidine interacts with components of toothpaste and forms salts of low solubility and antibacterial activity.
Alexidine is an antimicrobial agent, used in mouth washes as antiplaque cleaner. It is better for use than chlorhexidine because it is relatively non-toxic
Chlorhexidine and alexidine were synthesized in 1950s.
They inhibit a dental plaque formation by 70%.
Dental plaque is a biofilm of microorganisms that grows in the mouth.
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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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Which characteristic feature of the sternum should the nurse observe in a client with the diagnosis of pectus carinatum?
Frontward thrust the sternum of a patient with pectus carinatum protrudes forward, forcing the surrounding ribs to slant backward. In the funnel chest, the sternum and surrounding cartilages are visible. The natural anatomical location of the sternum is in the midline and in a straight posture. Barrell chest is characterized by a horizontal sternum and an elevated intercostal angle.
What is pectus carinatum?
The word "pectus carinatum" is used to describe a variety of aberrant protrusions of the front chest wall. Depending on where the deformity is most prominent, it can be either chondrogladiolar or chondromanubrial. Additionally conceivable are lateral abnormalities.Hippocrates noted that persons with the carinatum deformity experienced "difficulty breathing" and had a "sharply pointed chest."
Patients with symptoms describe breathlessness and a reduction in stamina. Some people have chest wall stiffness, increasing emphysema, reduced lung compliance, and more respiratory tract infections.
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09/22/2022
A chemist measures the amount of mercury in sediment samples from three areas of a river (the source, the midway point, and the
mouth).
Which is the most reasonable hypothesis for the chemist's experiment?
If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the mouth
and lowest at the source.
If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the mouth
and lowest at the midway point.
If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be the same all along
the river.
If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the
source and lowest at the mouth.
If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the source and lowest at the mouth.
Further testing should show that this is a commonly followed rule. Observations should be explained in a published scientific paper. Scientists look for answers to questions and solutions to problems using a process called the scientific method. This process consists of observation, hypothesis development, and experimental design. Bringing additional observations hypotheses, and experiments in repeated cycles
Chemists use the scientific method to conduct experiments formulate hypotheses formulate laws, and develop theories to better understand how the natural world behaves. In scientific thinking, hypotheses are formed before applicable research is conducted. The theory, on the other hand, is supported by evidence. This is a principle formulated as an attempt to explain what the data already support.
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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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Which solution is more concentrated: a 100 mm solution of glucose (c6h12o6) or a 0.1 m solution of glucose?
Solute : The minor component in a solution mixed in the solvent. Example - Salt, Sugar, Carbon dioxide (CO2) , Acetic acid etc.
Solvent : The substances that are used to disslove solutes ( this may be in the form of solid, liquid and gases) is known as solvent. Example : Water, Milk, Air , Ethanol, Methanol etc.
Solution : A solution is a homongeneous composition of one or more solutes mixed in a solvent. Example : Salt Water, Sugar mixed in water, Alcohol in water etc.
Types of Solution : Hypotonic , Isotonic, Hypertonic.
According tov question,
100 mm solution of glucose is more concentrated than 0.1 m solution of glucose because when we try to find the molality of 100 mm solution it is 0.617 m hence 100 mm solution of glucose is greater.
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a block of wood has a volume of 45 cm ^3 and a mass of 180 grams what is the density of the wood
The density of a block of wood that has a volume of 45 cm³ and a mass of 180 grams is 4g/cm³.
How to calculate density?The density of a substance is the measure of the mass of matter contained in the substance by a unit volume.
The density of a substance can be calculated by dividing the mass of the substance by its volume i.e.
Density = mass (g) ÷ volume (mL)
According to this question, a block of wood that has a volume of 45 cm³ and a mass of 180 grams will possess a density of:
Density = 180g ÷ 45cm³ = 4g/cm³
Therefore, the density of a block of wood that has a volume of 45 cm³ and a mass of 180 grams is 4g/cm³.
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Instead rudy consumes 500 ml of orange juice (ph 3.3), who has consumed more hydrogen ions?
Rudy consumes 2.5 ×[tex]10^{-4}[/tex] moles hydrogen ions.
What are ions?
A negatively charged ion called an anion has more electrons than protons compared to a positively charged ion called a cation. The electrostatic force causes opposite electric charges to be drawn towards one another, causing cations and anions to attract one another and easily form ionic compounds.
Atomic or monatomic ions are those made up of just one atom, whereas molecular or polyatomic ions are those made up of two or more atoms. Physical ionization occurs when molecules spontaneously collide in a fluid (gas or liquid), producing "ion pairs" that each contains a free electron and a positive ion. Chemical reactions, such as the dissolution of a salt in liquids, can also produce ions.
Rady consumes 500 ml of organic juice of [tex]p^{H}[/tex]
3.3
[tex]p^{H}[/tex] = 33
- log [[tex]H^{+}[/tex]] = 3.3
[[tex]H^{+}[/tex]] = [tex]10^{-3.3}[/tex]
[[tex]H^{+}[/tex]] = 5.01 x [tex]10^{-4}[/tex] M
Volume of organic juice = 500ml = 0.5L
Mole of [tex]H^{+}[/tex] ions = 2.5 ×[tex]10^{-4}[/tex] moles
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What type of ring strain is predominantly responsible for causing cyclooctane to be higher in energy than linear octane?
a. torsional strain
b. transannular strain
c. angle strain
d. isomer strain
Transannular strain predominantly responsible for causing cyclooctane to be higher in energy than linear octane.
Linear octane is a chain like structure in which 8 carbon atom are present and cyclooctane is a cycle like structure in which 8 carbon atom are present. cycloalkanes tend to give off a very high and non-favorable energy, and the spatial orientation of the atoms is called the ring strain in that linear octane there is no ring strain because this is like a chain and in cyclooctane transannular strain is seen because it is cycle like structure the unfavorable interactions of ring substituents on non-adjacent carbons called transannular strain in cyclooctane transannular strain is more that's why energy is higher than linear octane.
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What would be considered as a homogeneous among the the following mixtures?
emulsion
pizza
salad
soda
1.1.F - Lesson Review: What is Science Knowledge?
help xnx
If two atoms are joined by a polar covalent bond, the shared electrons will tend to stay closer to the atom with ______.
If two atoms are joined by a polar covalent bond, the shared electrons will tend to stay closer to the atom with the higher electronegativity
What is electronegativity?An atom's ability to attract the electrons of a bond is known as its electronegativity, and it rises as this propensity does. A covalent bond is formed when two coupled atoms with the same electronegativity values are in close proximity to one another.
In a chemical bond, the more electronegative atom often attracts the electrons more than the other atom. A polar covalent bond is the result of this. The electrons are not at all shared if the electronegativity values are drastically different. To create an ionic bond, one atom effectively accepts the bond electrons from the other atom.
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What does dissolved carbon dioxide in the ocean produce?
a. hydrogen ions
b. algae
c. oxygen
d. nitrous oxide
Option A. Hydrogen Ions
The dissolution of carbon dioxide in the oceans produce hydrogen ions as when carbon dioxide is dissolved in the ocean it leads to Ocean Acidification. This Acidification produces the hydronium ions as more acidic nature implies higher concentrations of hydrogen ions.
Carbon dioxide is a gas that readily dissolves in water to give Carbonic Acid , bicarbonate ions and carbonate ions , all of which are acidic in nature. This lowers the pH of the ocean making the waters more acidic. Therefore the acidity of oceans is largely dependent on carbon compounds and the amount of Carbon dioxide.
The reaction of Carbon dioxide with water to give carbonic acid :
CO2 + H2O → H2CO3
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A mixture of water (H2O) and ammonia (NH3):
Answer:
h20 + NH3
Explanation:
water plus ammonia gives or produces a weak qcid
Answer:
The answer is hydrogen bonding
Explanation:
What type of polymer would you obtain if sorbitol was used as a plasticizer additive?
The type polymer would you obtain if sorbitol was used as a plasticizer additive is the Bio - polymer.
Plasticizers are the substances added to polymer soultion to enhances its flexibility and plasticity. This is the reason plasticizers make polymer solution suitable for the application of film coating.
Bio - polymers are produced from natural sources. Bio based polymer may produced from sugar- based or starch based.
Sorbitol is a naturally occuring sugar alcohol. it is the effective plasticizer for improving melt processing ability.sorbitol is a type of carbohydrate known as sugar alcohol or polyol. It is found in sugar free gum used as a plasticizers and reduce the hydrogen bonding of polymer and incorporate spaces into the polymer.
so, when sorbitol used as plasticizer additive the type of polymer formed is bio - polymer.
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The is the si unit that expresses the amount of substance. Specifically, it is defined as the amount of substance containing the same number of entities as the number of in exactly 12 g of carbon-12.
The mole is the si unit that expresses the amount of substance
It provides a specific measure of the number of atoms or molecules in a bulk sample of matter. A mole is defined as the amount of substance containing the same number of discrete entities (atoms, molecules, ions) as the number of atoms in a sample of pure 12C weighing exactly 12 g
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A chemist measures the amount of fluorine gas produced during an experiment. He finds that 3.8 g of fluorine gas is produced. Calculate the number of moles of fluorine gas produced. Round your answer to 2 significant digits.
Answer:
0.10
Explanation:
Molar mass of F2 gas = 38 g/mol.
Moles of F2 gas = 3.8/38 g/mol
=0.1
Rounded to 2 significant digits is 0.10.
0.10 moles F2 has been produced.
Resonance structures for a molecule are an indication of overall lower energy for the molecule. True or false?.
This statement is true.
When all of the features of a compound cannot be explained by a single structure, numerous structures of that compound are employed to explain all of the attributes of the given molecule.
This phenomenon is referred to as resonance, and all structures are referred to as resonant structures.
As a result, resonance structures are collections of Lewis structures that explain the delocalization of electrons in a polyatomic ion or molecule, and the larger the extent of electron delocalization, the lower the overall energy in the system. Thus, resonance is known to increase compound stability by lowering energy.
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Calculate the moles of ammonia present in a 3.939 g sample of ammonia, which has a molar mass of 17.030 g/mol.
The moles of ammonia present in a 3.939 g sample having molar mass of 17.030 g/mol is 0.23 mole.
The mass of one mole of a substance, whether be an element or a compound is known as the molar mass.
If the molar mass of ammonia is 17.030 g/mol, then
In 1 mole of ammonia there are 17.030 g.
So, by definition of molar mass, there are-
17.030 g in 1 mole of ammonia,
In 3.939 g of ammonia, number of moles are -
number of moles = Given mass
Molar mass
moles = 3.939 g = 0.23 mol
17.030 g/mol
The moles of ammonia present in a 3.939 g sample are 0.23 mol.
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state what would be observed if each of the following reagents was added to the solution of aluminum chloride
i) lead (ii) nitrate solution
ii) ammonia solution drop wise until in excess
Answer:
See explanation
Explanation:
1) a precipitate of lead chloride would be observed if the concentrations of both reagents was high enough and the temperature was low enough
2) A gelatinous white-ish precipitate would be observed at first, though i'm not sure what would happen with excess ammonia. The precipitate would likely not dissolve in excess ammonia
An oxygen (o) atom has _____ protons, _____ neutrons, and _____ unfilled electron orbitals.
An oxygen (o) atom has 8 protons, 8 neutrons, and 2 unfilled electron orbitals.
What is electron orbitals?The three-dimensional regions surrounding an atom's nucleus known as electron orbitals are where a certain electron can be found. Two electrons can fit into each orbital.
They go by the name of atomic orbitals too. The number of electrons an atom contains determines the form of its atomic orbitals. The s, p, d, and f orbitals will all be covered in this lesson. Their orbital forms will also be revealed to us.
An orbital is a mathematical function that, according to its precise definition, represents the location of an electron in an atom with a high degree of probability. According to the mathematical function for that orbital, the term "atomic orbital" often refers to the area of space where an electron might be present.
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How would you prepare 10. 0 ml of a 0. 25% m/v hcl solution if 1% m/v hcl was available? how much 1% m/v hcl is needed? how much distilled water is used?.
7.5ml distilled water is used to 0. 0 ml of a 0. 25% m/v hcl solution if 1% m/v hcl was available
Here so 2.5 ml of 1% m/v HCl and (10 - 2.5) = 7.5 ml distilled water taken to prepare 10 mL of a 0.25% m/v HCl solution. 2.5 mL of 1 % m/v HCl is needed. 7.5 ml of distilled water is used to make 10ml solution and in that solution 1% hcl means 3.6 hcl is needed. mass of hcl is 36g/mol
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At what approximate temperature will the reaction mixture containing methyl salicylate and 30 ml of 4m sodium hydroxide boil?
At 223.3°C the solution will boil.
What is methyl salicylate?The organic substance methyl salicylate has the chemical formula C₈H₈O₃. It is salicylic acid's methyl ester. It is a clear, viscous liquid that is commonly referred to as "minty" since it is a component of mint candies. It has a sweet, fruity aroma reminiscent of root beer.
What is sodium hydroxide?Lye and caustic soda are other names for sodium hydroxide, an inorganic substance having the formula NaOH. It is a white, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).
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What does it mean for matter to change physically?
Answer:
Its when it transforms into a diffrent product like water to ice.
Explanation:
paulo is experimenting with H2O in its different states. He would like to present all the information he collected in one place. He thinks he should use a phase change diagram, but he isn’t sure. What information could you give Paulo to encourage him to use a phase change diagram?
The phase diagram makes it possible to predict the stability of any of the phases of water based on the diagram..
What is a phase diagram?Water is able to exist in three phases; solid, liquid and gas. The reason behind the phases of water is the fact that there are different degrees of intermolecular interactions that exists in the various phases of water.
Thus, on the phase diagram, of is easy to trace the the regions of temperature and pressure that corresponds to the solid, gaseous and liquid states of a given substance that could be used to make deduction about the substance.
The phase diagram shows the interaction between the various phases of water on the same diagram. This makes it possible to predict the stability of any of the phases of water based on the diagram.
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1 Samples of four gases are released in a room at the same time.
The gases are carbon dioxide, CO₂, hydrogen chloride, HCl, hydrogen sulfide, H₂S, and nitroge
dioxide, NO₂.
Which gas diffuses fastest?
Answer:
H2S
Explanation:
The gas with the smallest molar mass diffuses the fastest (assuming that the holes are the same size and that gasses act ideally).
Find the molar mass of each of the gasses, and then compare.
CO2 = 12 + 16 + 16 = 32 + 12 = 44
HCl = 35.45 + 1 = 36.45
H2S = 1 + 1 + 32 = 34
NO2 = 14 + 16 + 16 = 32 + 14 = 46
Therefor, H2S diffuses the fastest, then HCl, then CO2, and finally NO2
Which one of the following pairs of elements would be most likely to share similar properties?
a) n and f
b) b and si
c) cl and br
d) br and kr
e) li and be
Elements that would share similar properties are c) Cl and Br.
Elements chlorine (Cl) and bromine (Br) are both halogen elements.
In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessine (Ts).
They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.
Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
Chemical properties of these elements are similar, because they have the same number of valence electrons.
a) Nitrogen(N) and fluorine (F) are not in the same group of Periodic table of elements, so they have different properties.
b) Boron (N) and Si (silicon) are not in the same group of Periodic table.
d) Bromine and Kr (krypton) are different, because krypton is a noble gas.
e) Lithium (Li) and beryllium (Be) are not in the same group of Periodic table.
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Help please !!
Fast!!
Step 1 convert lbs to kg step 2 kg to g 3rd step g to mg
Here given data is 0.47 pound then we have to convert how many miligram = ?
So here 0.47 pound (lbs) = 0.2131 kg
1 kg = how many gram then 1kg = 1000 gram
So, 0.2131 kg = 213.1 gram
So 1 gram = 1000 mg then
So, 213.1 gram = 0.2131 mg
Then here three conversion are seen means step 1 =0.47 pound (lbs) = 0.2131 kg to step 2 = 2131 kg = 213.1 gram to step 3 = 213.1 gram = 0.2131 mg
This is the conversion from beginning to ending
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What distance in kilometers can you drive if your car gets 14.00 kilometers per liter and you have 35.00 liters of gas?
2.5 km is the distance you can travel if a car gets 14 kilometers per liter and have 35 liters of gas.
Total distance traveled in 1 liter = 14 km
Total gas in the car = 35 liters
We have to find how much distance can be covered in in35 liters of gas.
Distance is the length of the path traveled between two points. It is the total movement of an object in a direction. It measures length.
Distance = 35/14
Or, distance = 2.5 km
Therefore, the total distance that can be covered by a car in 35 liters of gas is 2.5 km.
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A proton is moving at a speed of 0.30 mm s-1. if the uncertainty in its momentum is to be reduced to 0.0400 per cent, what will be the uncertainty in its position in nanometers?
Response: 26.3 nm
A proton is moving at a speed of 0.30 mm s-1.
if the uncertainty in its momentum is to be reduced to 0.0400 per cent
0.04% of 0.3 Mms-1 = delta v.
= 1.2*10^-4 Mm/s
= 1.2*10^-4*10^6 m/s
delta v= 120 m/s
delta x *m*delta v=h/4pi
delta x*(1.67*10^-27)*120 = 6.626*10^-34/ 4pi
delta x = 2.63 *10^-10
delta x = 26.3 nm
if the uncertainty in its momentum is to be reduced to 0.0400 per cent, 26.3 nm will be the uncertainty.
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46 pints = ? gallons