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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After teaching a group of students about fats and biotransformation, the instructor determines that the teaching was successful when the students identify what as the storage location of bile acids?
The storage location of bile acids is the gall bladder.
Bile acids are made from cholesterol in the liver. Cholic acid and chenodeoxycholic acid are the major bile acids.
These acids are very crucial for the digestion of dietary fats and fat-soluble vitamins(A, D, E, and K).
The bile that is secreted by the liver passes through the hepatic ducts and is stored and concentrated in a thin muscular sac called the gall bladder. The bile then reaches the small intestine where it acts upon the food and helps in its digestion.
Therefore, the instructor determines that the teaching was successful when the students identify the gall bladder as the storage location of bile acids.
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How many protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200
The number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.
What is atomic number?Atomic number of an element is the number of protons in an atom of the element while the atomic mass is the sum of the protons and neutrons in the atom.
The electron number is equal to the number of protons in a neutral atom.
According to this question, the isotope of an element has an atomic number of 79 and a mass number of 200.
Number of protons = 79Number of electrons = 79Number of neutrons = (200 - 79) = 121Therefore, the number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.
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Earth is made mostly of metals and rocks. where did the elements (carbon, silicon, iron, etc.) that make up these materials form?
Earth is made mostly of metals and rocks. the elements (carbon, silicon, iron, etc.) that make up these materials form, and they were produced by nuclear fusion in stars.
Metals are materials that, when freshly worked, polished, or crushed, have a lustrous appearance and are relatively good conductors of electricity and heat. Metals are typically ductile and malleable. These properties are the result of metallic bonding between the atoms or molecules of the metal.
Metal is very useful material. Metals have many properties such as B. Strength, toughness, and stiffness. When heated, the metal can be shaped into anything from tiny paper clips to giant airplanes. It is also an excellent conductor of electricity and heat, making it useful for electricity and cooking pots.
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The molecules in a sample of solid so2 are attracted to each other by a combination of?
The molecules in a sample of solid so2 are attracted to each other by a combination of London forces and dipole-dipole interactions.
What are London forces?Other names for London dispersion forces include dispersion forces, London forces, fluctuation induced dipole bonds, instantaneous dipole-induced dipole forces, and weakly van der Waals forces. Since the electrons are often arranged symmetrically with regard to the nucleus, they serve as a form of electrically symmetric force between atoms and molecules.
What are dipole dipole interactions?Dipole-dipole interactions, which result from the close association of induced or permanent dipoles, are weak interactions. Van der Waals interactions are the name given to these forces taken as a whole. These interactions are widespread in proteins and range widely in strength.
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A vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa. determine the absolute pressure in the chamber and express it in pa, kpa, bar and psi
Vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa then the absolute pressure in the chamber and express is 57kpa
Gauge pressure is the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, and negative for pressures and absolute pressure is the sum of gauge pressure and atmospheric pressure
Here to find absolute pressure atmospheric pressure=92kpa and vacuum gage=35 kpa
Pabsolute pressure=Patmospehric pressure - Pvaccume
92-35=57kpa
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Spontaneous movement of molecules and ions from an area of high concentration to an area of low concentration. True or false?.
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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Conclude Each
year,
the American Chemical
Society holds a national meeting and many
regional meetings for chemists. Reports of
these meetings are then circulated all over
the world Why do you think this has become
standard practice?
Someone please help
This has become common practice, in my opinion, since scientists need to exchange ideas.
I think this has become standard practice because scientists need to share their ideas.Generally, most scientists don't work individually. They cooperate and work in teams. In contrast, a team is more effective than a single person in solving a scientific puzzle.Additionally, when they discuss the meeting reports, it facilitates their ability to agree on the concepts presented.. Every idea is questioned. This accurate evaluation guarantees that scientific knowledge is solidly supported.Also, scientists have to be aware of the latest researches and ideas in their field.To learn more about American chemical society visit:
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What type of bonds occurs between neighboring amino acids in a secondary structure in creating alpha helices and beta pleats?.
Hydrogen bonds occur between neighboring amino acids in a secondary structure in creating alpha helices and beta pleats.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
Protein is composed of amino acid linked with peptide bond, secundary structure can be α-helices and beta pleated sheet.
In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone.
Fluorine atom has greater electronegativity than oxygen atom in carbony group, so the hydrogen bond with hydrogen atom is shorter and strands are closer.
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An aluminum-containing compound has the formula mgxalyo4 and is 44. 98% oxygen by mass. What is the value of the subscripts x and y?.
The value of the subscripts x is 1 and y is 2.
ω(O) = 44.98% ÷ 100%
ω(O) = 0.4498; mass percentage of oxygen in the compound
M(compound) = 4 × 16 g/mol / 0.4498
M(compound) = 142.3 g/mol; molar mass of the compound
Oxidation number of oxygen atom in the compound is -2, for oxygen atoms total charge is -8.
Magnesium and aluminium must have total charge of +8 in the compound.
Magnesium has oxidation number +2.
Aluminium has oxidation number +3.
x is amount of magnesium atoms.
y is amount of aluminium atoms.
x × (+2) + y × (+3) = +8
x must be 1 and y must be 2.
M(compound) = M(Mg) + 2M(Al) + 4M(O)
M(compound) = 24.3 g/mol + 2×27 g/mol + 4×16 g/mol
M(compound) = 142.3 g/mol.
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When placed inside of a magnetic field, nmr active nuclei act in what way? (1 pt)
When placed inside of a magnetic field, the magnetic field that electrons generate aligns in the opposite direction of the applied magnetic field.
Magnetic fields are used in all modern technology, especially in electrical engineering and electromechanics. Rotating magnetic fields are used in both electric motors and generators. Magnetic field interactions in electrical devices such as transformers are conceptualized and studied as magnetic circuits. Magnetic forces use the Hall effect to provide information about charge carriers within a material.
The Earth creates its own magnetic field, which protects the Earth's ozone layer from the solar wind and is important for navigating with a compass. Magnetism is a class of physical properties imparted by magnetic fields and refers to the ability to induce attractive and repulsive phenomena in other entities.
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The main function of a(n)______ is to help an interaction between two chemicals to occur, changing both chemicals.
The main function of a vitamin is to help interaction between two chemicals to occur, changing both chemicals.
In toxicology, synergism refers to the effect caused when exposure to two or more chemicals at one time results in health effects that are greater than the sum of the effects of the individual chemicals.
What are vitamins?
nutrients may be described as a special elegance of micronutrients that must be received from the food regimen for you to maintain frame homeostasis, which can be liposoluble or hydro soluble.nutrients are natural molecules which can be required for the proper functioning of the frame and the development of organisms.There are thirteen vitamins in people, of which 9 are water soluble and four (A, D, E, okay) are fats soluble.Therefore, the main function of a vitamin is to help interaction between two chemicals to occur, changing both chemicals.
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How many grams of kmno4 correspond to 3.13 x 1022 formula units of kmno4? avogadro's number is 6.022 x 1023.
8.21g of KMnO₄ correspond to 3.13 x 10²² formula units of KMnO₄? avogadro' s number is 6.022 x 10²³
Here,3.13 x 10²² formula units of KMnO₄=1 mole of KMnO₄/avagadro no
1 mole of KMnO₄/6.022 x 10²³
= 3.13 x 10²²/6.022 x 10²³
= 5.197moles of KMnO₄
Now KMnO₄ has molar mass is 158.034g/mol
5.197moles of KMnO₄=158.034/1 mole of KMnO₄
158.034×5.197=821.1g of KMnO₄
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An ideal gas contained in 5.0 liter chamber at a temperature of 37°C. If
the gas exerts a pressure of 2.0 atm on the walls of the chamber, which of
the following expressions is equal to the number of moles of the gas?
a.
(2.0)(5.0)
(2.0) (310)
b. (2.0)(0.0821)
(5.0) (37)
c.
(2.0) (0.0821)
(5.0) (310)
d.
(0.0821) (37)
(0.0821)(5.0)
e.
(2.0)(5.0)
(0.0821) (310)
Answer:
earning
Explanation:
yeah its ok
Write down the names of the new substances formed when each of the following substances reacts with dilute hydrochloric acid: (i) ammonia (ii) sodium hydroxide (iii) calcium carbonate
The names of the new substances formed are:
1) ammonium chloride (NH₄Cl)
2) Sodium chloride (NaCl)
3) Calcium chloride (CaCl₂) and carbon(IV) dioxide (CO₂)
1) Balanced chemical equation for reaction of ammonia (NH₃) and dilute hydrochloric acid (HCl):
HCl + NH₃ → NH₄Cl
2) Balanced chemical equation for reaction of sodium hydroxide (NaOH) and dilute hydrochloric acid:
HCl + NaOH → NaCl + H₂O
3) Balanced chemical equation for reaction of calcium carbonate (CaCO₃) and dilute hydrochloric acid:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
These chemical reactions are double displacement reactions, cations and anions of the two reactants switch places and form two new compounds.
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You are heating a piece of glass and now want to pick it up. you should?
Answer:
pick it up with tongs
Explanation:
A student in chm 11500 lab measured a 10. 00-ml sample of deionized water into a pre-weighed erlenmeyer flask using a 50-ml buret and recorded the mass as 9. 95 g. The temperature of the sample was 24 °c. The percent error in the volume measurement was __________________.
The percent error in the volume measurement was 0.238 %.
d(water) = 0.99738 g/ml; density of the water at 24°C
V(water) = 10.00 m; volume of the water sample
m(water) = d(water) × V(water)
m(water) = 0.99738 g/ml × 10.00 ml
m(water) = 9.9738 g; mass of the water sample
error = (9.9738 g - 9.95 g) ÷ 9.9738 g · 100%
error = 0.238 %
The percent error is an error between an observed value and the true value of a measurement.
In this problem, an observed value is 9.95 grams and the true value of a measurement is 9.9738 grams.
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Has two naturally occurring isotopes, and , with masses of 68.9257 u and 70.9249 u, respectively. calculate the percent abundances of these isotopes of gallium.
The percentage abundance of isotopes of gallium is 61.56% is Ga-70.92 & 38.44% is Ga-68.93.
What do you mean by gallium?Gallium (31Ga) is composed of two stable isotopes: gallium-69 and gallium-71. Gallium-67 and gallium-68 are the most commercially important radioisotopes.
Gallium-67 (half-life: 3.3 days) is a gamma-emitting isotope (the gamma ray emitted immediately after electron capture) that is used in standard nuclear medical imaging procedures known as gallium scans. It is most commonly used as the free ion, Ga3+. It is the gallium radioisotope with the longest half-life.
Are gallium isotopes naturally occurring?Gallium has two naturally occurring isotopes: Ga-69 (mass 68.9256 amu, natural abundance 60.11%), and Ga-71 (mass 70.9247 amu, natural abundance 39.89%).
Calculate the percent abundances of these isotopes of gallium.Gallium's average atomic mass =[tex]\frac{68.9257 +70.9249}{2}[/tex]
=69.9253
Let x equal the percentage abundance of the first isotope.
by utilizing
AAM=[tex]\frac{W_{1}X_{1} * W_{2} X_{2} }{100}[/tex]
[tex]69.70 = \frac{70.925 *X +68.926 * (1-X)}{100}[/tex]
[tex]69.70 = 70.925X + 68.926 - 68.926 X[/tex]
x = 61.56%
61.56% is Ga-70.92. (100-61.56)
& 38.44% is Ga-68.93.
The percentage abundance of isotopes of gallium is 61.56% is Ga-70.92 & 38.44% is Ga-68.93.
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How does the electron configuration of ions derived from representative elements give them stability?
The electron configuration of ions derived by stable arrangement.
What is electron configuration of ions?Their valence shell contains two or eight electrons. They don't acquire, shed, or distribute electrons.
An atom with a full outermost (valence) shell has a stable electrical configuration. The quantity of electrons that leave or enter an atom's outer shell is known as its valency.
A noble gas configuration is a stable electron configuration for representative or main group elements. By acquiring or losing electrons and forming ions, or by sharing electrons with other atoms, the representative elements' atoms can adopt a noble gas structure.
The stability of an electron arrangement can be predicted. When all of an atom's orbitals are filled, it is at its most stable and unreactive. The combinations with full energy levels are the most stable.
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A molecule with a trigonal bipyramidal electron geometry must have a central atom with how many bonding and nonbonding electron groups around it?
A molecule with a trigonal bipyramidal electron geometry must have a central atom with how many bonding and nonbonding electron groups around it Equatorial.
An atom is a single neutral particle. A molecule is a neutral particle with two or more atoms bonded together. Water is a simple molecule consisting of one oxygen atom bonded to two different hydrogen atoms. The bond is a polar covalent bond (polar bond) due to the high electronegativity of the oxygen atom.
About 99% of the body consists of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. Something like table salt (NaCl) is a compound because it is made up of multiple elements (sodium and chlorine), but it is not a molecule because the bonds that hold NaCl together are ionic bonds.
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The anaerobic process of splitting glucose and forming two molecules of pyruvic acid.
The anaerobic process of splitting glucose and forming two molecules of pyruvic acid is called 'glycolysis.'
The word glycolysis means 'glucose splitting' and this is what happens throughout the process.
During glycolysis, enzymes are used to split one molecule of glucose into two molecules of pyruvate (pyruvic acid).
This process produces end products which include two molecules of ATP and two molecules of NADPH as well as water.
As this is an 'anaerobic process' which means it doesn't need oxygen for the process.
The process of glycolysis also takes place inside the cytoplasm and occurs in both aerobic and non-aerobic organisms.
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Describe the energy inputs and outputs of a bonfire.
Answer:
The logs are the input and the flames are the output
Explanation
Suppose a graduated cylinder were not correctly calibrated. how would this affect the results of a measurement? how would it affect the results of a calculation using this measurement?
The volume measurements won't be accurate and will be either less than or more than the anticipated figure if the graduated cylinder is accurately calibrated (depending on if the error in calibration is higher or lower). Depending on the calibration error, the calculated value may be higher or lower than the real value.
What is calibration?
Setting up an instrument so that it can generate findings for samples that fall within a tolerable range is part of the calibration process. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.
Calibration attempts to reduce any measurement uncertainty by confirming the precision of test apparatus. In measuring procedures, calibration quantifies and reduces mistakes or uncertainties to a manageable level.
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What is the atomic number for an element whose mass number is 78, which contains 36 neutrons per atom?
Describe what matter is and give three characteristics.
Matter is anything that has mass and occupies space.
Characteristics:
1. Volume
2. Density
3. Compressibility
When two protons are extremely close to each other there is a strong __________ between them.
When two protons are extremely close to each other, there is a strong nuclear force between them.
The force between a proton and neutron is same as the force between two proton, which the nuclear force. Nuclear forces can also be called as the nuclear interactions. Nuclear forces affects the neutrons and protons, both nucleons in identical or similar way.
Strong nuclear force is one of the fundamental forces of the nature and it is strongest among the four. Four fundamental forces are -Gravitation, strong nuclear force, weak nuclear force, and electromagnetism.
The energy that is used in nuclear power and nuclear weapons, the nuclear force has an important role in storing it. To bring the charged protons together against their electric repulsion, energy is required. When the protons and neutrons are bound together by the nuclear force they form a nucleus, this energy is in stored form.
So, the strong forces holding two protons extremely close is strong nuclear forces.
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Benny pushes a 20 kg crate from rest. If the crate accelerates at a rate of 3 m/s2, what is the amount of force applied for it to move?
Answer:
60 N.
Explanation:
The force formula of acting on an object is F=ma.
This means that...
F= force
M - mass
A = acceleration
So to solve this you have to solve for F.
F=ma
F=(20kg)(3m/s^2)
F= 60 N.
I hope this helps, have a good day! :D
What mass of liquid mercury would fill a glass tube with a diameter of 16.0 mm to a height of 25.0 cm? the density of mercury is 13.53gcm3.
The mass of liquid mercury that can fill glass tube is 680.365 gm.
We know that ,
Volume of cylinder = π[tex]r^{2} h[/tex]
where r is the radius of cylinder and h is the height
Here diameter of glass tube is 16mm
Thus the radius r = 8 mm
= 0.8 cm
Volume of glass tube = π [tex]0.8^{2}[/tex][tex]*25[/tex] [tex]cm^{3}[/tex]
Density of mercury given is [tex]13.53gm/cm^{3}[/tex]
We know that
Density = Mass / Volume
∴ [tex]13.53gm/cm^{3}[/tex] = Mass/ π[tex]0.8*0.8 * 25[/tex]
Mass = 13.53 *π0.8*0.8*25
= 680.36 gm
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A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0°c, the volume of the gas is 371 ml. To what temperature must the gas be heated to occupy a volume of 557 ml? report your answer in degrees celcius to the nearest whole number.
The gas must be heated to a final temperature of 137°C in order to fill a volume of 557 ml.
Given,V₁= 371mlV₂ = 557 mlT₁ = 0°C or 273 K
The final gas temperature that has to be heated must be determined.
As long as the cylinder is free to move, the pressure is always 1 atm, or equal to the external pressure.
Consequently, by using Charles Law, we obtain
V₁ / T₁ = V₂ / T₂
where starting and ultimate volumes V1 and V2, respectively T1 and T2 are beginning and ultimate temperatures, respectively (in Kelvin).
The ultimate temperature is as a result
T₂ = V₂ × T₁ / V₁Or, T₂ = 557 x (0+273) / 371Or, T₂ = 410 KOr, T₂ = 137°C.
As a result, the temperature is 137°C at the end.
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You place 10.00 mL of water in a graduated cylinder and add a 15.0 g sample of iron to the water. The new water level is 11.91 mL. What is the density of the iron?
The density of the iron, given the data from the question is 7.85 g/mL
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the density of the ironThe following data were obtained from the question:
Volume of water = 10 mLVolume of wate + iron = 11.91Volume of 1ron = 11.91 - 10 = 1.91 mLMass of iron = 15 gDensity of iron =?The density of the iron can be obtained as follow:
Density = mass / volume
Density of iron = 15 / 1.91
Density of iron = 7.85 g/mL
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HELP, as much as i try to understand i cant
The table is based on the periodic table and is to be filled by finding out various elements of periodic table
Disclaimer:
The table given below is not clear and hence only general idea can be provided
The table is based on the idea of periodic table where various constituents such as mass number, overall charge , total particles, number of protons have been asked to be labelled.
Sodium has been solved as an example and various postulates of Cu is being provided to solve accordingly
In the constituents of element Cu
Name- Cuprous and Cupric
Atomic number-29
Mass number-63
overall charge-+2 for Cuprous and +3 for Cupric
Total particles in nucleus-63
number of protons -29
number of neutrons-34
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