Because they lack the stiffness required for alignment, molecules with only single bonds do not generally display liquid-crystalline characteristics. One or more atoms make up a molecule. The biological substances, such as proteins and DNA, can be composed of thousands of the atoms.
A molecule is composed of atoms that have been joined together. So, whereas an atom is a separate thing, a molecule is generated when those atoms come together. These elements are may be the same, such as the two oxygen atoms bonded together (O2), or they may be different atoms linked together, such as the water (H2O).
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For the gauge that reads gauge pressure, does the pressure reading decrease, increase, or remain the same?
The pressure reading increases.
Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit vicinity over which that pressure is distributed. Gauge stress (also spelled gage pressure)[a] is the stress relative to the ambient pressure.
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an increase in pressure increasing the billing point is an example of a-
An increase in pressure increasing the billing point is an example of a physical property.
The term "boiling point" describes the temperature at which a liquid, which is being boiled, changes from a liquid to a vapor when its pressure equals that of its environment.Physical changes are those that take place when a material's structure is the same both before and after the change.When a substance is changed into another chemical substance, this is known as chemical transformation.When describing the state of a physical system, a substance's physical qualities are those that can be measured.A substance's characteristic that is seen in a chemical reaction is referred to as a chemical property.As it demonstrates the physical state, the increase in pressure with boiling point is an example of a physical property.
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The complete question is:
An increase in pressure increasing the boiling point of a liquid is an example of a —
A physical change
B chemical change
C physical property
D chemical property
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The molecular mass of glucose is 180 g. to make a 1m solution of glucose, you should _______.
The molecular mass of glucose is 180 g. To make 1 M solution of glucose , you should dissolve 1 mole of glucose in 1 litre of water.
The molecular mass of glucose is 180.16 g/mole, therefore 1 mole is 180.16 grams.
So, to make a 1 M solution, you should take 1 mole = 180.16 g of glucose and make up to 1 litre.
Working glucose solution is prepared by diluting the stock solution.
It can also be said that 1 M glucose solution is -
1 M glucose solution = 180 g / 1000 m L
= 0.18.
So, it is 0.18 % w/v.
Glucose solution is a mixture of glucose and water. It is used to treat low blood sugar and the water loss without the electrolyte loss. Glucose solution is an isosmotic solution. If it is in large amount, it produces hypertonic effects on the system.
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Suppose that you are conducting a field experiment with plants. You are testing the hypothesis that plants grow faster when mulch covers the soil. Plan how you would conduct the experiment. Include the types of evidence you would gather. Then plan how you would repeat it.
Start by setting up your materials you would put one plant in mulch and one without. After 2-3 weeks of proper care of the plants you record your findings, did the plant grow more without without the mulch?
From the information provided in this module, when should emergency response training be provided?
From the knowledge provided in this module, emergency response training should be provided before starting work and as periodic refresher training.
What does routine refresher training entail?
Refresher training is applicable to all learning domains. This tactic is particularly important in compliance and safety training, as businesses typically have regulations for yearly or irregular reviews. Regular sessions make sure that students are continuously updated on the most recent information as well as intricate organizational procedures and processes.
Who needs to be trained on emergency action plan components?
OSHA mandates that all employees receive training on the emergency action plan. When any of the following occurs, employees must receive training: A job is initially given to an employee. The plan's requirements for an employee change.
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How many electron bonds are shared between tewo carbon atoms when they are joined by a double bond?
2 electron bonds are shared between two carbon atoms when they are joined by a double bond.
An atom is a particle of matter that uniquely defines a chemical element. Atoms consist of a central nucleus surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.
Atoms are made up of two types of elementary particles: electrons and quarks. Electrons occupy the space surrounding the nucleus. Each electron has a charge of -1. Quarks form protons and neutrons, which form the nucleus. About 99% of the human body is made up of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. November 6, 2015
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Rubidium has two common isotopes, rubidium-86 and rubidium-87. If the
abundance of rubidium-86 is 73.2% and the abundance of rubidium-87 is 26.7%,
then what is the average atomic mass of rubidium?
HELP ASAP
The average atomic mass of Rubidium with two common isotopes Rb-86 and Rb-87 is 86.09 amu.
According to the question,
Abundance of Rubidium-86 = 73.2%
Abundance of Rubidium-87 = 26.7%
Steps to calculate the average atomic mass of an element are:
Their percentage abundances are divided by hundred to obtain a decimal value.The obtained value of each isotope is multiplied by its atomic mass.All the isotopic values are added.Therefore,
Rb-86 = 73.2/100 = 0.732
Rb-87 = 26.7/100 = 0.267
Atomic mass of Rb-86 = 0.732 × 85.91 = 62.89 amu
Atomic mass of Rb-87 = 0.267 × 86.91 = 23.20 amu
Hence, the average atomic mass = 62.89 amu + 23.20 amu = 86.09 amu.
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J. j. thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. his results showed that?
His results showed that matter included particles much smaller than the atom.
J. J. Tomson concluded that atoms are divisible and that the corpuscles are their building blocks.
Atoms are made up of smaller particles.
J. J. Thomson discovered the electron ( the negative charges of the atom) in 1897.
His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge and evenly distributed throughout the entire atom.
With this model, he abandoned his earlier hypothesis that the atom was composed of immaterial vortices.
Later, scientist Rutherford demonstrate that J.J Thompson's Plum Pudding model was not accurate.
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what should you be careful of when measuring the temperature of a liquid in a beaker
The precaution to be taken while measuring the temperature of a liquid in a beaker is applying proper heat balance and taking all the required precautions.
A beaker with an open top contains a sample of liquid. It exposes this sample to light. That liquid absorbs the light energy, turning it into heat energy. As a result, the liquid becomes warmer and evaporation is accelerated. As a result, there is less liquid in the beaker. Since it is well known that the surface temperature of a liquid, along with air movement above the liquid surface, is one of the dominant factors affecting evaporation, I want to measure the evaporation rate as a function of surface temperature.This can be done by applying a heat balance.Learn more about heat balance at:
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what is the frequency of a wave carrying 8.35 x 10^-18 J of energy?
Answer:
Therefore; the wavelength of wave is 6. 9×10−8m.
Answer:
1.26*10^16Hz
Using the planck-einsten equation, you plug in the values and you should get 1.26*10^16Hz.
If adp (two phosphates) were hydrolyzed to amp, how would you expect this reaction to compare with the hydrolysis of atp to amp?
If ADP (two phosphates) were hydrolyzed to AMP, how would you expect this reaction to compare with the hydrolysis of ATP to AMP?
ADP and ATP are both hydrolyzed to give AMP, the only difference remains in the side product formed which is pyrophosphate for ATP hydrolysis and inorganic phosphate for ADP hydrolysis.
What is ATP hydrolysis?
Adenosine triphosphate (ATP) contains highly energetic phosphoanhydride bonds that, when broken, such as occurs in muscles, release chemical energy through a catabolic reaction process called ATP hydrolysis. Adenosine diphosphate (ADP) and an inorganic phosphate are the end result (Pi). Adenosine monophosphate (AMP), energy, and another inorganic phosphate can all be produced by further hydrolyzing ADP (Pi). The final step in the energy chain from food or sunlight to useful work like muscle contraction, the creation of electrochemical gradients across membranes, and life-sustaining biosynthetic processes is ATP hydrolysis.
ATP + H 2 O → AMP + Pyrophosphate(PP)ADP + H 2 O → AMP + Inorganic Phosphate(Pi)
Thus, ADP and ATP are both hydrolyzed to give AMP, the only difference remains in the side product formed which is pyrophosphate for ATP hydrolysis and inorganic phosphate for ADP hydrolysis.
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Write the formula for each compound. capitalization and subscripts are graded. selenium tetrafluoride: oxygen difluoride:
The formula selenium tetrafluoride will be SeF4 and the formula of oxygen difluoride will be OF2.
In chemistry, compounds generally take prefixes and suffixes to signify the quantity of a particular atom in the molecule. For example, prefixes such as "tri-" could signify three atoms while prefixes such as "di-" could show two atoms. For suffixes, "-ide" could show anions that are nearly all electronegative.
Let's take the glance at the compound names step by step :
(a) Selenium tetrafluoride - As the compound has the prefix "tetra-" while fluoride method the appearance of a fluorine atom, we can write down the chemical formula as [tex]SeF_{4} .[/tex]
(b) Oxygen difluoride - Here we have second time the identical convention of the compound, now with the prefix di- which shows two fluorine atoms. The chemical formula will be here [tex]OF_{2}[/tex]
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What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons? quzket
The atomic number of an atom that has six protons, six neutrons, and six electrons is 6. And the element is carbon.
Carbon is known as a tetravalent compound.
It has four electrons in its outermost shell. It forms a covalent bond with other compounds.
The number of neutrons. = 6
Number of electrons = 6
Number of protons = 6
So the atomic number of the compound is,
The atomic number of an element = Number of protons present in its nucleus
The number of protons given in the compound is 6.
So the atomic number of the compound is also 6.
Carbon has six atomic numbers.
Therefore, the atomic number of an atom that has six protons, six neutrons, and six electrons is 6. And the element is carbon.
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suppose you wanted to compare two different stain removers to learn which one was better at removing food stains from clothing. In your test, which variable would you need to control ?
Answer:
The amount/type of stain
Explanation:
You would want to ensure that the stain was the same in both samples.
For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs ________.
When a substance exhibits liquid-crystalline qualities, the change from solid to liquid-crystalline state takes place at the solid's melting point.
What are liquid crystals?
The process of turning a liquid substance into a highly structured solid, with its atoms or molecules arranged in a well defined three-dimensional crystal lattice, is known as crystallisation.
A type of substance known as liquid crystal (LC) has qualities halfway between those of solid crystals and regular liquids. For instance, a liquid crystal's molecules may flow like a liquid while still having a crystal-like orientation.
Crystallized liquid. Liquid crystals are a type of substance known as liquid crystals (LCs) exhibits properties that fall somewhere between those of solid crystals and those of regular liquids. For instance, a liquid crystal's molecules may flow like a liquid while still having a crystal-like orientation.Thus, a substance exhibiting liquid-crystalline characteristics, the conversion from liquid-crystal occurs at the solid's melting point.
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Explain how the variation in carbon skeleton contributes to diversity and complexity of organic molecules?
Carbon skeletons may vary in shape, length, number, location and strenght of covalent bonds between carbon atoms.
Element carbon is in group 14 of Periodic table of elements.
Electron configuration for carbon: ₆C 1s² 2s² 2p².
Valence electrons are in 2s and 2p orbitals. There is one pair of electrons in 2s orbital and two lone electrons in 2p orbital with the same electron spin.
A carbon atom has four covalent bonds with other carbon atoms in an organic compound.
Carbon also has different type of hybridization (sp, sp2 and sp3).
The strenght of carbon-carbon bond is approximately 350 kJ/mol.
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Why is it necessary to keep the temperature constant, but not the concentration of the reactants when determining the rate law expression through the initial rate method?
It is necessary to keep the temperature constant, but not the concentration of the reactants when determining the rate law expression.
What is the rate law expression?
A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation or rate law equation.
A frequent way for determining rate laws is the concept of beginning rates. The method includes determining the starting rate of a reaction, as the name initial rate method would imply. To observe how the reaction rate varies, the measurement is repeated for several sets of beginning concentration conditions.
When establishing the rate law expression using the initial rate technique, it is required to maintain a constant temperature but not the reactant concentration because the rate constant fluctuates with temperature. k=Ae^-Ea/RT.
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Identify the properly written and balanced equation for the precipitation reaction between sodium carbonate and strontium iodide.
The wrote and balanced equation for the precipitation reaction between sodium carbonate and strontium iodide.
(NH4)2S + CoCl2 → CoS + 2 NH4Cl
This equation is properly balanced. There are 2 nitrogen atoms, 8 hydrogen atoms, 1 sulfur atom, 1 cobalt atom, and 2 chlorine atoms on both the left and right sides of the reaction arrow, and all of the compounds are neutral as written.
A balanced chemical formula is one in which the number of atoms of each type in the reaction is the same on both the reactant and product sides. A balanced chemical formula has equal mass and change. A balanced equation is an equation of a chemical reaction in which the number of atoms and total charge of each element in the reaction is the same for both reactants and products. In other words, mass and charge are balanced on both sides of the reaction.
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Consider these statements about an element E in group 5A
a 60kg sack of the rice is lifeted with a 30n force what its acceleration
given:
uknow:
formula:
solution:
Antibiotics are powerful medicines for treating some infections, but they have limitations. while antibiotics are very effective in the treatment of bacterial infections, they do not work against viral infections. what differences between bacteria and viruses account for this?
Differences between bacteria and viruses is that viruses do not have cell wall.
Only bacterial infections can be treated with antibiotics, viruses do not respond to antibiotics.
Antibiotics attack the cell wall or coating surrounding bacteria. There are two types of cell wall: Gram-positive and Gram-negative.
For example antibiotic penicillin:
After it was discovered, penicillin was very effective in destroying the bacterium Staphylococcus aureus. Today, because of natural selection in Staphylococcus aureus populations, they are resistant to antibiotics based on penicillin (Staphylococcus aureus bacterium is resistant to methicillin, β-lactam antibiotic of the penicillin class).
Staphylococcus aureus is a Gram-positive, round-shaped bacterium which causes a skin infections.
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Osmium has a density of 22.6g/cm3. what volume (in cm3) would be occupied by 21.8g of osmium?
a. 0.965
b. 1.04
c. 493
d. 2.03x10-3
e. 2.03x103
The osmium with a density of 22.6g/cm3 has a volume in cm3 of 0.965 cm3
The density formula and the procedure we will use is:
ρ = m/v
Where:
v= volumeρ= densitym= massInformation about the problem:
m= 21.8gρ= 22.6g/cm3v= ?Applying the density formula and isolating the volume (v), we get:
ρ = m/v
v = m / ρ
v = 21.8 g / 22.6g/cm3
v = 0.965 cm3
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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for number less than 0.1, such as 0.06, the zeros to the right of the decimal point but before the first nonzero digit
For the number less than 0.1 such as 0.006, the zeroes to the right of the decimal point but before the first non zero digit show the decimal place of the first significant digit.
The number that is given as digits is established using significant figures.Any two non-zero digits that are separated by a zero are significant figure.Every zero that is both to the right and left of a non-zero digit and the decimal point is not significant figure. The quantity of significant figures frequently reveals the degree of measurement accuracy. From the first non-zero digits in the figure, we may determine the number of significant figures.There is only one significant figure in the provided number 0.06. The decimal place of the first digit is indicated by the zeros that appear to the right of the decimal point but before the first non-zero digit.
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A dehumidifier tank is emptied once a day. If the capacity of the tank is 2 gallons, determine how many molecules of water the dehumidifier collects from the air per millisecond.
(1 quart = 0.94633 liters; 4 quarts = 1 gallon; density of water is 1g/mL; 18 g water = 6.02x10^23 molecules of water)
I'm terrible with Dimensional Analysis!
A dehumidifier tank is emptied once a day. if the capacity of tank is 2 gallons , Number of Molecules of water the dehumidifier collects from the air per millisecond is 2.92 × 10³² molecules / milliseconds
The capacity of dehumidifier tank = 2 gallons
1 gallon = 4 quarts , 1 quart = 0.94633
1 gallon = 3.785 L
2 gallon = 3.785 × 2 = 7.57 L = 7570 ml
time taken to fill the tank = 1 day
Density of water = 1 g/ml
Mass of water = D × V
= 7570 × 1 = 7570 g
molar mass of water = 18 g/mol
no. of moles = mass / molar mass
= 7570 / 18 = 420.5 moles
now, 1 mole of water contains = 6.022 × 10²³ water molecules
420.5 moles of water = 6.022 × 10²³ × 420.5
= 2.53 × 10²⁶ molecules
2.53 × 10²⁶ molecules collected in 1 day
1 day = 86400 sec
1 sec = 1000 milliseconds
86400 sec = 86400 × 1000 milliseconds
= 8.64 × 10⁷ milliseconds
so, the molecules of water collected per milliseconds
= 2.53 × 10²⁶ molecules / 8.64 × 10⁷ milliseconds
= 2.92 × 10³² molecules / milliseconds
Thus, A dehumidifier tank is emptied once a day. if the capacity of tank is 2 gallons, Number of Molecules of water the dehumidifier collects from the air per millisecond is 2.92 × 10³² molecules / milliseconds
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Paracelcus (philippus aureolus theophrastus bombastus von hohenheim) was the first to articulate the foundational principle of toxicology, that the _____ makes the ______
Paracelsus (Philippus Aureolus Theophrastus Bombastus von Hohenheim) was the first to articulate the foundational principle of toxicology, that the dose that makes the poison.
Philippus Aureolus Theophrastus Bombastus von Hohenheim, in short Paracelsus, is the man who introduced the use of chemicals and minerals in medicine. He quoted that "In all things, there is a poison, and there is nothing without poison. It depends only upon the dose whether a poison is poison or not..." Since most of his prescriptions had the attention of arguments and fell out of favor, the use of arsenic is still active in killing certain parasites.
In the 16th century, his ideas on poison led to the introduction of chemistry into medicine. He was appreciated for these ideas when his presciption cured Louis XIV. The field of medicine would be different without his contributions.
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What are the equilibrium partial pressures of coco and co2co2 if coco is the only gas present initially, at a partial pressure of 0.900 atmatm ?
CO CO2
Initial partial pressure 1 0.9
Equilibrium partial pressure 1 - x 0.9 + x
The equilibrium constant is Kp=PCO2/PCO.
Substitute values: 0.259=(0.9+x) / 1−x
Hence, x = . -0.509
Hence, the equilibrium partial pressures of CO and CO2 are 1.509 atm, -0.509 atm respectively.
The pressure that is exerted with the aid of one among the mixture of gases if it occupies the identical quantity on its very own is acknowledged as Partial pressure. Every gasoline exerts sure strain in a mixture.
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Osmium has a density of 22.6 g/cm3. what volume (in cm3) would be occupied by a 21.8 g sample of osmium?
The volume occupied by a 21.8 g sample of osmium having a density of 22.6 g/cm3 is 0.965cm3.
The density formula is:
Density = mass/volume
To find volume:
Volume = mass/density
Now
mass = 21.8 g
density= 22.6 g/cm3
Putting the values
Volume = 21.8/22.6
volume = 0.965cm3
Thus the volume is 0.965cm3.
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The volume occupied of the sample of osmium with a density of 22.6 g/cm³ and a mass of 21.8 g is: 0.9646 cm³
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
d= 22.6 g/cm³m = 21.8 gv = ?Applying the density formula and clearing the volume we get:
d = m/v
v = m/ d
v = 21.8 g / 22.6 g/cm³
v = 0.9646 cm³
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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A compound that occupies a receptor, but does not activate the neuron is known as a(n):___________
A compound that occupies a receptor, but does not activate the neuron is known as an antagonist.
What is a neurotransmitter receptor?
A neurotransmitter receptor (also known as a neuroreceptor) is a protein on the membrane that is activated by a neurotransmitter. Chemicals on the cell's surface, such as a neurotransmitter, can bind to the membrane, and receptors can be found along the membrane.
Is it true that the majority of neurotransmitter receptors are G-protein coupled?G-protein coupled receptors are found on the majority of neurotransmitter receptors. Neurotransmitter (NT) receptors can be found on the surface of neurons and glia. One neuron sends messages to the other neuron via neurotransmitters at a synapse.
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We will now examine the patterns that exist for the ratios in which metal and nonmetal elements combine in order to learn more about patterns within this type of compound (between a metal and a nonmetal).
3. Write the formula and draw the particle diagram for each compound, given the two elements.
The ratio within each compound is given.
The right answer is given in the picture.
To find the formula of an ionic compound, first, identify the cation and write down its symbol and charge. Then identify the anion and note its sign and charge. Finally, the two ions combine to form an electrically neutral compound.
Particle diagram Elements and compounds can be represented using particle diagrams. This is a box with colored spheres drawn to represent atoms or molecules. These diagrams can represent elements and compounds and their molecular composition by the types of spheres and how they are connected. Particle diagrams are used to show particles, atoms, or molecules within matter. A diagram showing particles in a substance.
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What mass of agcl will precipitate when 10.0 g of nacl is added to an aqueous solution of agno3?
When 10.0 g of NaCl is added to an aqueous solution of AgNO₃, 24.5 g AgCl will be precipitated.
The balanced chemical reaction is:
NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq)
Molar mass of NaCl = 58.5 g
Molar mass of AgCl = 143.5 g
Number of moles of NaCl = Given Mass
Molecular Mass
= 10.0 g ÷ 58.44 g/mol
= 0.171 moles
From the reaction,
58.5 g of NaCl produces 143.5 g of AgCl
10.0 g of NaCl will produce 143.5 × 10.0 = 24.5 g AgCl
58.5
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