Answer:
Explanation:
To determine the mass of each compound, we need to convert them into units of moles first. We use avogadros number to do this and use the molar mass of the compounds to convert to mass.
3.01 × 1023 molecules H2O ( 1 mole / 6.022x10^23 kg) (18.02 g / 1 mole) = 9.01 g
8.32 × 1020 formula units CaBr2 ( 1 mole / 6.022x10^23 kg) (199.89 g / 1 mole) = 0.28 g
1.93 × 1026 molecules XeF6 ( 1 mole / 6.022x10^23 kg) (245.28 g / 1 mole) = 78610.16 g
Copper can have improved wear resistance if alloyed with ceramic alumina, Al2O3. If a copper alloy has 9.3 wt % Al2O3, what is its composition in mol %?
Composition in mole % is 0.091%
Given:
Copper alloy has 9.3 wt % Al2O3 = 9.3 wt/wt%
So the mol % of Al2O3 can be find by
Mole% = w/w% / Mwt
Mwt og Al2o3 = 101.968
Mole% = w/w% / Mwt
= 9.3 / 101.96
Mole% = 0.091%
The term "mole percent" (mol%) refers to the mole fraction in a different format. By multiplying the mole fraction by 100, the mole percent of the specified component can be calculated. Mole fraction multiplied by 100 equals Mole percent.
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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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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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Gold is alloyed with other metals to increase its hardness in making jewelry. You have a piece of jewelry containing only gold and silver, which have pure densities of 19.3 g/cm³ and 10.5 g/cm³ respectively. You measure the piece of jewelry's volume to be 1.25 cm³ and its mass to be 20.5 g. Assuming the total volume of the jewelry is the sum of the volumes of the gold and silver it contains, what is the mass percent of gold in the piece?
The mass percent of gold in the piece is 79.08%
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
Thus,
Mass = density × volume
How to determine the mass of goldDensity of gold = 19.3 g/cm³Volume of gold = VMass of gold =?Mass = density × volume
Mass of gold = 19.3 × V
Mass of gold = 19.3V
How to determine the mass of silverDensity of silver = 10.5 g/cm³Total volume = 1.25 cm³Volume of gold = VVollume of silver = 1.25 - volume of gold = 1.25 - VMass of silver =?Mass = density × volume
Mass of silver = 10.5 × (1.25 - V)
Mass of silver = 13.125 - 10.5V
How to determine the volume of the goldMass of gold = 19.3VMass of silver = 13.125 - 10.5VTotal mass of piece = 20.5 gVolume of gold (V) =?Mass of piece = mass of gold + mass of silver
20.5 = 19.3V + 13.125 - 10.5V
Collect like terms
19.3V - 10.5V = 20.5 - 13.125
8.8V = 7.375
Divide both sides by 8.8
V = 7.375 / 8.8
Volume of gold = 0.84 cm³
Thus,
Mass of gold = 19.3V
Mass of gold = 19.3 × 0.84
Mass of gold = 16.212 g
How to determine mass percent of goldTotal mass of piece = 20.5 gMass of gold = 16.212 gMass percent of gold =?Mass percent of gold = (mass of gold / mass of piece) × 100
Mass percent of gold = (16.212 / 20.5) × 100
Mass percent of gold = 79.08%
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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 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 final temperature of the gas is 137°C at which it must be heated to occupy the volume of 557 ml.
Given,
V₁= 371ml
V₂ = 557 ml
T₁ = 0°C or 273 okay
We ought to locate the very last temperature of the fuel that must be heated.
as the cylinder is transferring freely, the pressure is equal to the outside pressure, i.e., 1 atm, beneath all situations.
consequently, by using the use of Charles regulation, we get
V₁ / T₁ = V₂ / T₂
where V₁ and V₂ are preliminary and very last volumes
and T₁ and T₂ are preliminary and very last temperatures (in Kelvin).
accordingly, the very last temperature is
T₂ = V₂ × T₁ / V₁
Or, T₂ = 557 x (zero+273) / 371
Or, T₂ = 410 okay
Or, T₂ = 137°C
consequently the final temperature is 137°C.
The physical principle known as Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius)
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Assuming a density of 1.00 g/ml what is the total mass of the solution (water) in the calorimeter?
If we assume the density of water is 1.00 g/mL, the mass of water is 250 g
To find mass here density is given so we use density formula density=mass/volume
The volume of water is given but not the mass. Hence volume is converted into mass by using the density of water, which 1.0 g /ml. Therefore, Mass of water = 250 ml x 1.0 g/ml = 250 g
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The measurement 0.035550 g rounded off to two significant figures would
be
Answer:
0.036g
Explanation:
I've learned about sig figs
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 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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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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The formula weight of ammonium sulfate ((nh4)2so4), rounded to the nearest integer, is ________ amu.
a. 264
b. 132
c. 118
d. 100
e. 116
The formula weight of ammonium sulfate ((NH₄)₂SO₄), rounded to the nearest integer, is 132 amu
Ammonium sulfate ((NH₄)₂SO₄) formula are as follow:
((NH₄)₂SO₄)
Now,28+8+32+64 = 132gm/mol
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Dolomite is very similar to calcite, but some of the calcium in its structure has been replaced with ______.
Answer:
magnesium
Explanation:
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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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
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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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.
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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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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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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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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(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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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
Describe what matter is and give three characteristics.
Matter is anything that has mass and occupies space.
Characteristics:
1. Volume
2. Density
3. Compressibility
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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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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How would you prepare 10. 0 ml of a 0. 25% m/v hcl solution if 1% m/v hcl was available? how much 1% m/v hcl is needed? how much distilled water is used?.
To prepare the HCl solution if 1% m/v HCL was available, take 2.5ml of the stock solution and makeup to mark with 7.5 ml of water.
What is HCl?HCl is hydrochloric acid, and it is a highly reactive and strong acid.
Given, the dilution formula
C₁V₁= C₂V₂
C₁ = initial concentration
V₁ = initial volume
C₂ = Final concentration
V₂ = final volume
The values are
C₁ = 1% m/v
V₁ = ?
C₂ = 0.25% m/v
V₂ = 10 ml
V₁ = C₂V₂/C₁
V₁ = 0.25% m/v × 10 ml /1% m/v
V₁ = 2.5 ml
Thus, the amount of HCl is 2.5ml of the stock solution. The amount of water is 7.5 ml of water.
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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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