how about give me brainliest b ll tt cc hh
A sample of monochloro pentaborane (9), b5h8cl, has a mass of 20.1 g. what amount, in moles, does this mass represent?
The number of moles in monochloro pentaborane (9) [tex]B_5H_8Cl[/tex] is 0.37056.
We know that ,
Number of moles = Given mass/ Molar mass
Given mass of monochloro pentaborane (9) is 20.1 g
The molar mass of monochloro pentaborane (9) is
= [tex]5*B + 8*H + Cl[/tex]
= [tex]5* 10.811 + 8 * 1 + 35.453[/tex]
= 54.241
Thus number of moles = 20.1/54.241
= 0.37056
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a covalent bond involves: a. transferring of b. sharing protons c. transferring protons d. sharing electrons
A covalent bond involves: d. sharing electrons
The atoms of a molecule are held together by electrical forces that hold the atoms together, this is due to the electrical attraction between the electrons of the atom of one element and the nucleus of the other atom, this force of attraction is called covalent bond.
A covalent bond involves the sharing of electrons that are in the last energy layer of the atoms because they are the most likely or willing to be shared.
An example of a covalent bond is the bond between a hydrogen atom and a carbon atom in methane.
What is an atom?The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.
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Buffers work best when. Buffers work best when. The ratio of h to oh- is close to 1. 0. Nearly all of the buffer molecules are undissociated. Nearly all of the buffer molecules are dissociated. The ph is nearly neutral. About half of the buffer molecules are dissociated
The corrcet answer is option D: About half of the buffer molecules are dissociated.
Buffers work best when about half of the buffer molecules are dissociated.
In chemistry, an aqueous solution that can resist change in pH when acidic or basic substances are added to it is called a buffer solution.
The main components of a buffer are a weak acid and a conjugate base and vice versa.
When an acid or a base is added to it, it cancels out its effects and makes the solution neutral.
In this way, it maintains a very stable pH of the solution under all conditions.
For a chemical reaction, buffers are really important and handy solutions.
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Banded iron formations are made of the minerals ______ and ______.
Banded iron formations are made of minerals like iron-rich silicates and iron-rich carbonates.
What is banded iron?
Banded iron is the sedimentary rocks that are formed by the iron-rich contents and iron-rich carbonates and silicates. These minerals are hematite and magnetite.
The organisms that release oxygen are converted into iron oxides underwater, and they form sedimentary rocks like banded iron. The oxides are composed on the ocean floor, and they turn into rocks.
Thus, the correct minerals for banded iron formation are iron-rich silicates and iron-rich carbonates.
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In which set do all elements tend to form anions in binary ionic compounds? n, s, i rb, al, s sr, ni, hg li, sb, bi
The correct set is N, S, and I.
The right combination is N, S, and I.
The ions of two separate elements, one of which is a metal and the other a nonmetal, make up a binary ionic combination. As a result, in binary ionic compounds, metals form cations and non-metals produce anions. As non-metals, nitrogen (N), sulfur (S), and iondine (1) produce anions in binary ionic compounds anions.
Since Li is a metal, it cannot form an anion.
The other sets are wrong.
Being metals, Rb and Al do not form.
Sr, Ni, and other metals are not anions since they are metals.
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how many grams of iron will be needed to react completely with an excess of oxygen to form 40 grams of iron oxide ?
28 grams of iron will be needed to react completely to form 40 grams of iron oxide.
The atomic mass of iron, 2 Fe = 112
The molecular mass of iron oxide (III) = 160
We have to find how many grams of iron are required to form 40 grams of iron oxide.
By using the comparison formula, we get,
The atomic mass of iron/ Molecular mass of iron oxide = Mass of iron/mass of iron oxide.
Mass of iron = 112/160 × 40
Or, the mass of iron = 28grams.
Therefore, 28 grams of iron will be required to react completely to form 40 grams of iron oxide.
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carbonic acid (h2co3) is a weak acid formed when carbon dioxide dissolves in water. what ions could be present in a carbonic acid solution?
carbonic acid (h2co3) is a weak acid formed when carbon dioxide dissolves in water. The ions present in a carbonic acid solution are H+ and HCO3–.
Carbonic acid is a weak acid with a chemical formula of H2CO3. In the presence of water, the partial dissociation of the carbonic acid occurs to produce H+ and HCO3– ions.
It is an inorganic compound also known as diprotic acid because it can form two types of salts; carbonates and bicarbonates. It is produced at industrial level as a by-product during the burning of the fossil fuels.
Carbonic acid is used to prepare carbonated water, sparkling wine. It can also be used to remove carbon dioxide from water.
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Most combustibles, when burned with just the stoichiometric amount of air, under conditions where no heat is lost, will produce flames at what temperature range?
Most combustibles, when burned with just the stoichiometric amount of air, under conditions where no heat is lost, will produce flames between the temperature range of 2100-2300 K.
What do you understand about the process of Combustion?Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is referred to as the fuel and the oxygen's source as the oxidizer. Although it is typically a liquid for airplane propulsion, the fuel can be a solid, liquid, or gas. However, combustion is a chemical reaction between substances, usually including oxygen, and usually accompanied by the generation of heat and light in the form of flame.
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Describes the type of covalent bond found between oxygen and kydrogen in water molecules
Polar covalent bonds are the type of covalent bond found between oxygen and hydrogen in water molecules
Water is a Polar Covalent Molecule
The choppy distribution of electrons among atoms and the uneven form of the molecule way that the water molecule has poles - a superb price at the hydrogen pole (side) and an oxygen Negative price at the poles (flanks)).
A water molecule includes hydrogen atoms covalently bonded to the equal oxygen atom. Oxygen atoms are electronegative and entice covalent electrons in covalent bonds.
The bond among the oxygen and hydrogen atoms withinside the water molecule is a polar covalent bond. H. Electrons aren't shared similarly among oxygen and hydrogen. Oxygen has a better affinity for electrons than hydrogen.
A polar covalent bond is a bond wherein the electron pairs are shared similarly among the 2 bonding atoms, and a polar covalent bond is a bond wherein the electron pairs are shared unequally among the 2 bonding atoms. Polar bonds are a result of variations in electronegativity.
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A diploid parent cell with genes h, t, and q has a maternal genotype htq and paternal genotype htq. what would be the most likely daughter cell genotype if independent assortment does not occur?
HTQ would be the most likely daughter cell genotype if independent assortment does not occur.
What is a genotype?The genetic components that make up an organism's genotype. The term "genotype" also refers to the set of alleles or genetic variations that a person possesses within a certain gene or genetic region. How many alleles a person can have for a particular gene depends on ploidy, or the quantity of copies of each chromosome found in that species. Since humans are diploid (having two complete sets of chromosomes), each individual has two alleles for each gene. When both alleles are the same, the genotype is said to be homozygous. When there are two different alleles, the genotype is said to be heterozygous.The type of variant present at a specific locus (i.e., region) in the genome is scored by what is known as a genotype. Symbols can be used to symbolize it. For illustration, BB, Bb, and bb could be used to denote a certain gene variant.To know more about genotype, refer:
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What term refers to exercise that primarily uses the oxygen-dependent energy system, oxidative phosphorylation?
Aerobic refers to exercise that primarily uses the oxygen-dependent energy system, oxidative phosphorylation.
Aerobic Respiration is the method of cellular respiration that takes place in the presence of oxygen gasoline to produce electricity from food. This type of breathing is frequent in most of the plant life and animals, birds, humans, and different mammals. In this process, water and carbon dioxide are produced as quit products.
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If the reaction occurs with an 73. 9% yield, what mass of iron should be reacted to produce 63. 0 grams of fe2o3?.
If reaction occurs with an 73.9% yield, the mass of iron which should be reacted to produce 63.0 g of Fe₂O₃ is 59.1 g
The balanced chemical equation of the reaction is :
4Fe + 3O₂ → 2Fe₂O₃
Molar ratio of iron and Fe₂O₃ is 4 : 2
For a reaction having 100 % yield, every 4 mole of iron will produce 2 moles of Fe₂O₃.
So, 63.0 g of Fe₂O₃ is produced by reaction. Let's use molar mass of Fe₂O₃ , which is 159.6 g/mol to find out number of moles produced.
moles = 63.0 g = 0.39 mol
159.6 g/mol
moles of iron needed if % yield is 100.
= 0.39 mol x 4 mol
2 mol
= 0.78 mol Fe
Since given percentage yield is 73.9%, more Fe is reacted.
% yield = actual yield x 100
theoretical yield
73.9 % = 63.0 g x 100
theoretical yield
Theoretical yield = 85.2 g
So, to find out mass of iron reacted to theoretically produce 85.2 g Fe₂O₃
Use molar mass of Fe and mole ratio of two compounds.
moles = 85.2 g = 0.53 moles Fe₂O₃
159.6 g/mol
using this,
= 0.53 Fe₂O₃ x 4 moles Fe
2 moles Fe₂O₃
= 1.06 moles Fe
So,
The mass of iron = ( 1.06 x 55.8 )g
= 59.1 g
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You would expect that cells that expend a great deal of energy, such as skeletal muscle cells, would have increased quantities of ___________.
Increased quantities of Mitochondria in the muscle cells leads to produce great amount of energy.
What are skeletal muscle cells?
Skeletal muscle fibers are very elongated cells with a sarcolemma, a very elastic and resilient plasma membrane. Muscle fibers are referred to as syncytiums because they are distinguished by the presence of many nuclei near the cell's edge.
Myocytes, or muscle cells, are the cells that make up muscular tissue. Long, cylindrical, multi-nucleated, and striated cells make up skeletal muscle. Due to their high energy needs, skeletal muscle cells have numerous mitochondria that enable them to produce enough ATP.
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The potential energy stored in high-energy bonds is commonly harnessed when the bonds are split by the addition of _______________ in a process called _____________.
The potential energy stored in high-energy bonds is commonly harnessed when the bonds are split by the addition of water in a process called hydrolysis.
Hydrolysis of high-energy compound (ATP) using water:
ATP + H2O → ADP + Pi
ATP is short for adenosine triphosphate.
Adenosine triphosphate converts to either the adenosine diphosphate (ADP) or adenosine monophosphate (AMP), in this process energy is released.
ATP is made of three components: the triphosphate, the sugar ribose and a nitrogenous base (adenine).
In cellular respiration where organic matter is transformed into carbon dioxide and energy is released for production of ATP.
Glucose and oxygen are reactants and carbon dioxide, water and energy are products of this chemical reaction; cellular respiration creates an energy molecule (ATP) when glucose is broken down.
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A chemist is designing an experiment to investigate the effect of temperature on the rate of a chemical change. Suggest a suitable hypothesis for the experiment. Also, list the dependent, independent, and controlled variables that can exist in such an investigation.
A suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.
Independent variable - TemperatureDependent variable - Rate of chemical changeWhat is an experiment?Experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.
A hypothesis is an educated guess or a tentative conjecture explaining an observation or scientific problem.
According to this question, a chemist is designing an experiment to investigate the effect of temperature on the rate of a chemical change.
This suggests that a suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.
Also, the Independent variable is the temperature because it is the variable that is changed.
Dependent variable is the rate of chemical change because it is the measured variable.
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Answer:
A suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.
Independent variable - Temperature
Dependent variable - Rate of chemical change
controlled variable - pressure or concentration of the reactants
The measurement 0.035550 g rounded off to two significant figures would
be
Answer:
0.036g
Explanation:
I've learned about sig figs
What concentration gradients are established and maintained by the sodium-potassium exchange pump?.
The concentration gradients are established and maintained by the sodium potassium - potassium exchange pump is the concentration of potassium (k+) is found higher inside the cell (neuron) and the concentration of sodium (Na+) is found higher outside the cell.
The sodium - potassium pump is an active transport that exchange sodium ions for potassium ions.Active transport is the energy - requiring process of pumping molecules and ions across membranes , against concentration gradient.
To move molecules against the concentration gradient , carrier protein is needed.The Na / K+ pump use the energy of ATP molecule to exchange the ions.
The Na+ / K+ Pump goes through cycles to maintain a negative membrane potential.Three sodium ions exit the cell while two potassium ion enters in the cell for every single ATP consumed.
Thus , the sodium - potassium pump maintains the gradient of high concentration of N+ extracellularly and high level of K+ intracellularly.
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What orbitals overlap to form the c-h bond in ethene (h2c=ch2)?
a. s-sp
b. s-sp3
c. p-p
d. s-sp2
e. s-p
The orbitals that overlap to form the c-h bond in ethene (h2c=ch2) is s-sp2. The correct option is d.
What are orbitals?Orbitals are wave functions that are the places where the electrons can be found. There are different orbitals present. These are s, p, d, and f. Orbitals are of different shapes. Round orbital and eight-like shapes.
Each carbon atom is joined to two hydrogen atoms in the ethylene molecule. Therefore, for the C-H sigma bonds in ethylene, overlap two sp2-hybridized orbitals with the 1s orbitals of two hydrogen atoms.
Thus, the correct option is d. s-sp2.
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A student wants to determine if a
sample of tap water contains Mg+2.
Which of the following pieces of
information are not needed to do a
titration ?
A. The number of moles of Mg ions that will be
bound to 1 mole of EDTA or the EDTA like compound
used.
B. The density of magnesium.
C. The molarity of the EDTA or EDTA like chemical
used in the titration.
The density of a gold nugget is 31.4 g/cm3. if the volume of the gold nugget is 0.00369 l, the mass of the nugget is ________
The mass of nugget is 106.446 grams.
We are given the density and volume of the gold nugget in the question. Now, to find the mass of gold nugget, we need to relate the three quantities. The relation between them is as follows -
Density = mass÷volume
Rewriting the formula according to mass
Mass = density × volume
Converting the volume from cm³ to liters. As per the known fact,
1 liter = 1000 cm³
So, 0.00369 liters = 3.69 cm³
Keep the values in formula to find the mass
Mass = 31.4×3.69
Performing multiplication to find the mass of gold nugget
Mass = 106.446 grams
Hence, the mass of gold nugget is 106.446 grams.
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Identify items that can be used to control the boiling when heating liquid in a round bottom flask.
The items can be used to control the boiling when heating liquid is in a round bottom flask are boiling chips or stones,a stir bar and stir plate.
What is Boiling?
When a liquid is heated to its boiling point, which is the temperature at which the vapour pressure of the liquid equals the pressure placed on it by the surrounding atmosphere.
Because they provide even boiling and stop the solution from boiling over, boiling stones are very helpful in chemical labs. These chips are designed to be porous in order to permit the formation of solvent vapors in the air cavities.
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You have to calculate the mass of a 30.0 ml liquid sample with density of 1.52 g/ml, but you have forgotten the formula. which way of reasoning would help you in finding the correct mass?
It is given that volume & density of liquid = 30.0ml = 1.52 g/ml
is read Density is as 1.529 g/ml
mass of Ime of liquid is 1.529.
option A is correct.
So, the mass of 30 ml liquid. = (1.52 x 30 g/ml ml =
1.529 X 30 g
45.69 g
the question is incomplete
A liquid is a nearly incompressible fluid that conforms to the shape of its container but maintains (nearly) constant volume regardless of pressure. As such, it is one of the four fundamental states of matter (the others being solids, gases, and plasmas) and is the only state with a definite volume, but no fixed shape. Liquids are made up of tiny vibrating particles of atom-like matter held together by intermolecular bonds. Like gases, liquids can flow and take the form of containers.
The volume of a liquid is fixed, but the shape is not. Examples of liquids are water, oil, and blood. A liquid is a state of matter that has a fixed volume but no fixed shape. That is, the liquid takes the shape of its container. The matter is something that takes up space and has weight. Solids keep their shape, liquids take the shape of their containers, and gases fill their containers.
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You have to calculate the mass of a 30.0 mL liquid sample with density of 1.52 g/mL, but you have forgotten the formula. Which way of reasoning would help you in finding the correct mass?
Select one:
a. If 1 mL of a liquid has the mass of 1.52 g, then 30.0 mL has the mass of _____ g.
b. If 1.52 mL of a liquid has the mass of 1 g, then 30.0 mL has the mass of _____ g.
Which polymers are composed of amino acids? nucleic acids carbohydrates proteins monomers
Proteins are composed of amino acid
What is amino acid?
Protein is constructed from amino acids. An extended chain of amino acids makes up proteins. There are a huge variety of proteins in your body, each of which performs a vital function.
Amino acid sequences differ for every protein. The protein can adopt various shapes and perform a variety of bodily tasks depending on the sequence.
The alphabet's letters can be compared to amino acids. You can create new words by combining letters in various ways. Similar principles apply to amino acids; by combining them in different ways, proteins of various types can be created.
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Gases other than compressed air are normally supplied in pressurized cylinders at?
Gases other than compressed air are normally supplied in pressurized cylinders at 1500 psi to 2000 psi.
What are compressed gas cylinders used for?
Cylinders of industrial compressed gas used in oxyfuel welding and steel cutting. A gas cylinder is a type of pressure container used to store and contain gases at pressures higher than atmospheric pressure.
Thus, typically, pressurized cylinders containing gases other than compressed air are delivered at pressures between 1500 and 2000 psi.
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The differences between ideal gases and real gases are most pronounced under what conditions?
The difference between ideal gases and real gases are most pronounced under conditions of inter molecular forces.
Difference between ideal gases and real gases are discussed below :
Real gases differ from ideal gases thanks to the presence of inter molecular forces, which cause the molecules of a true gas to deviate from perfect random motion.
As a result, real gases deviate from the perfect gas law at high densities and low temperatures, where the results of inter molecular forces are more pronounced.
So, the difference between ideal gases and real gases are most pronounced under conditions of inter molecular forces.
What are inter molecular forces?
The attractive forces that exist between molecules are liable for many of the bulk physical properties exhibited by substances.An inter molecular force (IMF) (or secondary force) is that the force that mediates interaction between molecules, including the electromagnetic forces of attraction or repulsion which act between atoms and other sorts of neighboring particles, e.g. atoms or ions.
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(a) Barium ions are poisonous. Patients with digestive tract problems are sometimes given
an X-ray after they have swallowed a ‘barium meal’, consisting of a suspension of
BaSO4 in water. The [Ba2+(aq)] in a saturated solution of BaSO4 is too low to cause
problems of toxicity.
(i) Write an expression for the solubility product, Ksp, for BaSO4, including its units.
...................................................................................................................................
(ii) The numerical value of Ksp is 1.30 × 10–10. Calculate [Ba2+(aq)] in a saturated
solution of BaSO4.
...................................................................................................................................
...................................................................................................................................
(iii) The numerical value of Ksp for BaCO3 (5 × 10–10) is not significantly higher than
that for BaSO4, but barium carbonate is very poisonous if ingested. Suggest a
reason why this might be so.
...................................................................................................................................
............................................................................
QUESTION NUMBER (b)(iii) and (ii) PLEASE....
The numerical value of the Ksp of [tex]BaSO_{4}[/tex] is 1.69 * 10^-20.
What is the Ksp?The Ksp is an equilibrium constant that shows the extent to which a substance is soluble in water. Now consider the fact that [tex]BaSO_{4}[/tex] is almost insoluble in water.
i) The Ksp of the [tex]BaSO_{4}[/tex] solution can be obtained from the relation;
Ksp = [[tex]Ba^{2+}[/tex]] [[tex]SO_{4}^{2-}[/tex]]
ii) The numerical value of the Ksp is obtained from; [1.30 × 10–10]^2 = 1.69 * 10^-20
iii) The reason for the toxicity of [tex]BaCO_{3}[/tex] even though it is not more soluble that barium sulfate is that [tex]BaCO_{3}[/tex] can dissolve in the gastrointestinal tract which is acidic leading to barium poisoning.
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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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Help me pls Its not a exam its about Homogenous and heterogeneous pls help me and pls rigth its description
Answer: hope this helps :)
Explanation:
Heterogeneous:
soy sauce, pizza, fruit salad, halo halo, iced mango juice (assuming this is a mango milkshake), sago milk tea
Homogeneous:
vinegar, salt solution, sugar syrup
abno ka hahaha hatdog hamburger
Would you expect Ibuprofen to be soluble or insoluble in 1.0 M NaOH? Explain.
Answer:soluble
Explanation: bc its less then NaOh
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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