An atom is composed of a central nucleus which is surrounded by electrons.
What is nucleus?A nucleus is the organelle within a cell that is membrane-enclosed and contains the chromosomes, according to genomics. Numerous holes in the nuclear membrane allow for the selective passage of certain molecules (such proteins and nucleic acids) into and out of the nucleus.
Protons, which have a positive charge, and neutrons, which have no electrical charge, make up the nucleus. Quarks are subatomic particles that make up protons and neutrons.
DNA is organised into chromosomes in the nucleus, which is located in the centre of the cell. The double nuclear membrane (outer and inner) that separates the nucleus from the cytoplasm, known as the nuclear envelope, envelops it. The rough endoplasmic reticulum and the outer membrane are one unit.
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ASAP!!! SCIENCE ITS DUE TOMZ
Answer:
1.
Groups - Verticle columns in the periodic table, signifies the number of valence electrons in the element.
vs.
Periods - Horizontal rows in the periodic table, signifies the number of shells in the element.
2. Because the group number corresponds to the number of valence electrons in an atom an element in group 5 (like Phosphorus) has 5 valence electrons.
Added information: a Valence electron is an electron in the outermost shell of an atom.
What is the approximate concentration of reaction product in a solution that has an absorbance of 0.7 at ph 6.0?
The approximate concentration of reaction product in a solution that has an absorbance of 0.7 at ph 6.0 is based on the equation A = εbc given in the passage, the concentration c is the absorbance A divided by the absorptivity ε in a 1 cm path length cell. 0.7 divided by approximately 1400 gives 500 μM.
A = εbc
0.7 = 1400 x c
7/14000 = 1/2000 = 0.0005 = 5x10^-4 = 500 μM
1 μM = 1 x10 ^-6
The concentration of a substance is the amount of solute present in a given volume of solution. Concentration is usually expressed in molarity, defined as the number of solutes in 1 L of solution. Solution concentration is a measure of the amount of solute dissolved in a given amount of solvent or solution.
Concentrated solutions are solutions that contain relatively large amounts of solutes. Dilute solutions are solutions that contain relatively small amounts of solutes. The definition of concentration means the amount of an ingredient or part relative to other ingredients or parts. An example of concentration is the amount of salt to water in a brine solution.
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In the first 85.0 s of this reaction, the concentration of no dropped from 1.12 m to 0.520 m . calculate the average rate of the reaction in this time interval.
In the first 85.0 s of this reaction, the concentration of no dropped from 1.12 m to 0.520 m .
What is rate of a reaction?
The speed at which a chemical reaction takes place is the rate of the reaction. It is the concentration change per unit time of a reactant in a reaction.
Since the concentration of NO reduces to half its initial concentration in 85 seconds that is from 1.12m to 0.520m, it can be said that 85 seconds is the half life interval for the reaction, Hence on average, half reaction is completed in the time interval of 85 seconds.
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Acetyl-coa enters the citric acid cycle by reacting with ________ to form ________.
Acetyl-CoA enters the citric acid cycle by reacting with oxaloacetate to form citrate.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
There are two main types of acids: organic acids and inorganic acids. Inorganic acids are sometimes called mineral acids. As a category, organic acids are often weaker than inorganic acids. The basic difference between the two is that organic acids contain carbon whereas inorganic acids do not. Natural Acids: These acids are found in foods. For example, acetic acid, tartaric acid, and lactic acid. Mineral or Inorganic Acids: These acids are used in various laboratory processes such as hydrochloric acid, and sulfuric acid.
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Identify the oxidizing agent and the reducing agent for: ba (s) cl2 (g) --> bacl2 (s)
CL2 is the oxidizing agent and Ba is the reducing agent for :
ba (s) cl2 (g) --> bacl2 (s)
Oxidation agents are those which oxidize another substance by taking up their electrons. The other substance gets oxidized and loses electrons. The oxidation agents themselves go through reduction.
The tendency of oxidizing agents to accept electrons is due to their high oxidation states. Halogen is an example of an oxidizing agent.
Reducing agents on the other hand reduces the other substance by giving them electrons. they themselves go through oxidation. Hydrogen is an example of a reducing agent.
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A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol. What is its molecular formula?.
Molecular formula of a molecule is C₂H₂.
Empirical formula gives the proportion of the elements present in a compound.
The proportion od carbon and hydrogen is 1 : 1.
n(C) : n(Cl) = 1 : 1
n(C) = n(H) = n; amount of substance of carbon and hydrogen is the same in a molecule
M(molecule) = 26 g/mol; molar mass of a molecule
M(C) = 12 g/mol; molar mass of carbon
M(H) = 1 g/mol; molar mass of hydrogen
M(molecule) = n × M(C) + n × M(H)
M(molecule) = n × 12 g/mol + n × 1 g/mol
26 g/mol = n × 13 g/mol
n = n(C) = n(H) = 2
There are 2 atoms of carbon and two atoms of hydrogen in a molecule, so molecular formula is C₂H₂.
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Would you expect Ibuprofen to be soluble or insoluble in 1.0 M NaOH? Explain.
Answer:soluble
Explanation: bc its less then NaOh
What metal wil not react with hydrochloride acid? Please help
4. Which of the following careers requires the study of chemistry? (Choose all that apply)
1. Pharmacist
2. Doctor
3. Nurse
4. Science teacher
If you had equal masses of each of the following substances, which would occupy the greatest volume?
Cocoa butter occupies the greatest volume.
What is cocoa butter good for?
Vitamin E has several health advantages for the body, and cocoa butter is a good source of this vitamin. The health of your blood, brain, skin, and reproductive system are all supported by vitamin E. Due to its high fatty acid content, cocoa butter is an excellent choice as the main component of skin creams.
Cocoa butter is 9/0 it's close to ICL but cocoa butter is the smallest end this one will take off the most volume because it is divided by the smaller density.It is important not to overheat the Baker when drying the sodium chloride because by these comments won't be loss and Baker was properly heat.
Complete question -
If you had equal masses of each of the following substances, which would occupy the greatest volume?a. ice (d = 0.917 g/mL)d. cocoa butter (d = 0.910 g/mL)b. water (d = 0.997 g/mL)e. aluminum (d = 2.70 g/mL)c. beeswax (d = 0.960 g/mL)
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The smallest particle and building block of all matter is called
HELP NEED ANSWER ASAP
Answer:
An atom is the smallest particle of an element and is the building block of all matter.
an electrical conductor is in a strong magnetic field. how is the conductor affected if it is connected to a battery so that current flows through the conductor?
When placed in a magnetic field, a current-carrying conductor experiences a mechanical force that can cause the conductor to move.
How does the magnetic field impact current?
Current and magnetic force are directly inversely connected in a homogeneous magnetic field for a straight current-carrying wire. As a result, the force is inversely related to the size of the current. This translates to: If the current is doubled, the force on the conductor will also double.
How do the fields of electricity and magnetism interact?Electric fields are created by differential voltages; the stronger the voltage, the stronger the resulting field. Magnetic fields are produced by electric current, and the stronger the current, the stronger the magnetic field. There will always be an electric field present even when there is no current flowing.
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What is the electrophile in the friedel-crafts alkylation reaction with tert-butyl chloride?
The tert-butyl cation is the electrophile in the friedel-crafts alkylation reaction with tert-butyl chloride.
What is tert-butyl chloride?
The organochloride with formula (CH3)3CCl is tert-butyl chloride. It is a flammable, colorless liquid. It has a limited water solubility and a propensity to hydrolyze into the equivalent tert-butyl alcohol. As an industrial precursor to various organic molecules, it is created.
In order to create alcohol and alkoxide salts, tert-butyl chloride is a crucial starting material in nucleophilic substitution processes. It is employed in Friedel-Crafts processes and as an alkylating agent for the introduction of the tert-butyl group. It serves as an intermediary in the synthesis of both medicines and agrochemicals.
Originally, this Alfa Aesar product was sold under the Thermo Scientific name. The legacy brand may be mentioned in some documents and label information.
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Ramelteon is a hypnotic agent used in the treatment of insomnia: what is the molecular formula of this compound? enter your answer in form of cxhynzow
Ramelteon is a hypnotic agent used in the treatment of insomnia. The molecular formula of this compound is C16H21NO2.
The molecular formula is the number of elements that are present in a compound. The molecular formula is calculated in terms of the empirical formula since the empirical formula is just the same or a multiple of the molecular formula.
The formula is :
n=M/mass of the empirical formula
Where,
M is the molar mass and n is an integer.
For example, the molecular formula of Caffeine C8H10N4O2 and its empirical formula is C4H5N2O.
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In biochemistry, where reactants are normally dissolved in water, which bonds or interactions are strongest?
In the biochemistry, Where reactants are normally dissolved in water, The strongest bond or interaction in the water is polar covalent bonds.
Water is a good solvent for polar and ionic compounds. the polarity and hydrogen bonding capability of water makes excellent solvent for polar molecules.In water ionic bonds come apart much more than covalent bonds.
The polarity of water molecules is what makes a widely good solvent . The positive part of the water molecules attract negative part of solute and negative part of water attract positive part of solute.
Water greatly weaken the electrostatic forces and hydrogen bonding between ionic and polar molecules by competing for their attraction.
Hydrogen bonds are weaker than ionic bond and covalent bonds but stronger than dipole dipole interaction.
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Hydrophilic molecules that are to be released by cells are stored in membrane-bound structures called:_____
Hydrophilic molecules that are to be released by cells are stored in membrane-bound structures called Secretory vesicles.
The secretory vesicle is a vesicle that mediates the vesicular delivery of cargo - e.g. hormones or neurotransmitters - from an organelle to particular web websites on the molecular membrane, in which it docks and fuses to launch its content.
Secretory vesicles shape from the trans-Golgi network, and they launch their contents to the molecular outside with the aid of using exocytosis in reaction to extracellular signals. The secreted product may be both a small molecule (together with histamine) or a protein (together with a hormone or digestive enzyme).
Vesicles are small systems inside a molecule, together with fluid enclosed with the aid of using a lipid bilayer worried in delivery, buoyancy control, and enzyme storage.
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In a combination circuit, to identify series and parallel elements, you should _____.
Which element forms easily into thin sheets?
O carbon
O helium
O gold
O bromine
a scientist wants to identify an unknown compound on the basis of its physical properties. the substance is a white solid at room temperature. attempts to determine its boiling point were unsuccessful. using table 6, name the unknown compound
The substance is a white solid at room temperature is sodium chlorides
We have a table of physical properties of four different substances and unknown substance that we're trying to identify using that table. So we have four compounds 1. oxygen 2.water 3.sucrose and 4.sodium chloride. both oxygen and water are colorless, so can't be those two. Sucrose and sodium chloride both are solids.abou boiling point , sucrose does not have a boiling point. and sodium chloride does have a boiling point, so the unknown compound is sodium chloridesSodium Chloride is essential to maintain the electrolyte balance of fluids in a person's body. it is also known as salt table.
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3. draw the lewis structure for these anions. each anion is a conjugate base of an acid. (e) hco3─ (h attached to one of the o’s) (f) so32─
The lewis structure for these anions are-
a fairly straightforward manner to visualize a molecule's valence shell electrons is through a Lewis structure. It gives insight into the pairing and association of the electrons surrounding every atom in the molecule.
every electron inside the Lewis dot structure can be represented via a dot, and a line connecting the dots is drawn to shape an electron bond.
simplest the valence electrons are taken under consideration whilst sketching the Lewis dot shape, ignoring the electrons that don't belong to the outermost shell.
The Lewis shape is the most effective and maximum constrained speculation; it does no longer describe how bonds are created or how electrons are disbursed most of the atoms. And that is visible as the essential constraint at the Lewis shape.
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A glass of orange juice contains 3.1 dl of juice. how many milliliters of orange juice are in the glass?
Answer:
310
Explanation:
During the synthesis of which type of molecule is a carboxyl group lost from a fatty acid, and water produced as an end product?
During the synthesis of lipids, a carboxyl group is lost from a fatty acid, and water is produced as an end product. The correct option is A.
What are lipids?Lipids are fatty acids that have two types of ends, a hydrophilic end, and a hydrophobic end. Lipids format the cell membrane structure and functions. They are greasy substances.
When there is a synthesis of lipids, water is produced as the end product and the carboxyl group will lose to form a molecule of fatty acid.
Thus, the correct option is A) lipids, regarding the molecule in which water is lost.
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The question is incomplete. Your most probably complete question is given below:
A) lipids
B) proteins
C) nucleic acids
D) carbohydrates
What is the atomic number of Gold
When heat moves through an object in an assembly that is more conductive than materials around it, that is described as ________
When heat moves through an object in an assembly that is more conductive than the materials around it, that is described as Conduction.
The substance or material from which things are made or constructed: Stone is a durable material. Raw materials or serving as raw materials for use or development: Pulp is the raw material of paper. each component. Textile fabric: dress fabric.
In our culture, the material is probably more important than we think. Materials affect transportation, housing, clothing, communications, reactions, food production, and nearly every area of daily life. Useful materials have physical, chemical, or biological properties that are useful even after they have served their intended purpose or function, and when removed from solids and separated from waste, are materials suitable for the same or different purposes. Purpose.
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The density of lead is 11.4g/cm^3. the mass of a lead ball with a radius of .50mm is:_________
The density of lead is 11.4 g/cm³. The mass of a lead ball with a radius of 0.50mm is 5.9714226 x 10⁻² g.
The density of a substance is defined as the mass of substance per unit of its volume. Density is represented by the symbol, ρ.
The formula for density is -
Density (ρ) = mass (m)
volume (v)
Given :
Density of lead = 11.4 g/cm³
Radius of lead ball = 0.50 mm = 0.05 cm
Since,
Vsphere = 4/3 π r³
v = 4 × 3.14 × (0.05)³
3
v = 4.18 x (1.25 x 10⁻³)
v = 5.225 x 10⁻³
Since,
Density = mass
volume
11.4 g/cm³ = mass
5.225 x 10⁻³
mass = 11.4 x (5.225 x 10⁻³)
mass = 5.9565 x 10⁻² or 0.05955 g
So, the mass of a lead ball with a radius of 0.50mm is 5.9565 x 10⁻² g
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You decide you want to find out how temperature affects the rate of dissolving sugar. you put the same amount of sugar into two identical beakers each with the same amount of water but at different temperatures. what is the variable? what is an independent variable? what is the dependent variable? explain your answers.
The experiment is performed to determine the solution and the observations. Variables are the data that are present in the experiment. Temperature is the independent and solubility is the dependent variable.
What are independent and dependent variables?Independent variables are defined by the variables that vary in the experiment and are the temperature in this case as the dissolution capability of the sugar is studied in the experiment.
The solubility of the sugar is a dependent variable as it varies based on the temperature of the beaker which affects the solubility factor. It gets altered by the temperature.
Therefore, the temperature is the independent variable.
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An atom has 13 protons, 12 neutrons and 13 electrons in an atom. it loses 2 electrons to form an ion. find the number of protons, and electrons in the ion. also, find the charge of the ion.
(Tell as soon as possible) *Thank you *
Answer:
If there are 13 protons (positive charges), how many electrons are there in a neutral atom? Expert Answer 1)) given total number of protons =13 and electron =12 . For atom to be neutral total number of protons should be equal to total number of electrons.
Explanation:
Sand particles have density equal to 0.70 g/mL. A teacher ordered a 22 kg bag of sand from the scientific supply company. Sand plus air (as ordered) takes up 1.3 times as much volume as the sand particles alone. What is the volume in cubic feet (ft3) of sand plus air that the teacher ordered?
I need so much help with Dimensional Analysis aaaa
The volume of sand plus air that the teacher order is 14.4 x 10^4 ft3.
What is volume?
Volume is defined as the space occupied within the boundaries of an object in three dimensional space. It is also known as capacity of the object.
The SI unit of volume is liter.
To calculate the volume of sand :
Density = mass / volume
As density is given 0.70g/ml and mass of sand is 22kg then,
Volume = mass/ density
= 22 / 0.7g/ml = 31.43 g/ml or cm3
As sand plus air is 1.3 time much as volume of sand alone,
Then 31.43g/ml = 31.43 x 1.3 = 40.86 g/ml or cm3
40.86 cm3 is equal to 14.4 x 10^4 ft3
Thus, the volume of sand plus air that the teacher order is 14.4 x 10^4 ft3.
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The most common ions for silver, zinc, and scandium are ag , zn2 , and sc3 . which of these ions have the same number of electrons as a noble-gas element?
Sc3+ ion has the same number of electrons as a noble-gas element.
For example, scandium (Sc) is an element with atomic number 21.
Electron configuration of scandium atom: ₂₁Sc 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹.
Electron configuration of scandium ion 3+: 1s² 2s² 2p⁶ 3s² 3p⁶
Scandium ion Sc³⁺ has the same number of electrons as noble gas argon (Ar).
Silver (Ag) is an element with atomic number 47.
Electron configuration of silver metal: [Kr] 4d¹⁰ 5s¹
Electron configuration of silver ion 1+: [Kr] 4d¹⁰
It does not have same configuration as noble gas.
Zinc a chemical element (the group 12 of the periodic table) with symbol Zn and atomic number 30, which means it has 30 protons and 30 electrons, because atom has neutral charge.
Electronic configuration of zinc atom: ₃₀Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s².
Electronic configuration of zinc ion Zn²⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰
It does not have same configuration as noble gas.
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When a protein of 50 nanometers is mixed with water the opaque result is called a(n):_____.
When a protein of 50 nanometers is mixed with water, the opaque result is called a: suspension.
A suspension is a heterogeneous combination of two or extra substances. In it, the particles are suspended for the duration of the solution in bulk and can be easily viewed by means of bare eyes.
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