Chlorine has more valence electrons than P or Si, which causes its core 2s orbital to be closer to its nucleus.
What exactly are the valence electrons?Valence electrons are the electrons located in an atom's outermost energy level or shell. For instance, the oxygen molecule has six valence electrons, two of which are located in the 2s subshell and four in the 2p subshell.
What are the valence electrons' physical characteristics?For neutral atoms, the total number of valence electrons is the same as the total number of primary group electrons. Looking at an element's column in the periodic table will reveal its major group number. One member of group four, carbon, has four valence electrons.
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Which of the following elements has the highest atomic mass?
A) fluorine
B) beryllium
C) aluminum
D) argon
Atomic mass increases as the atomic number increases, this is because that atomic number repersent the amount of protons in the atomic,
out of these 4 choices
F(9)
Be(4)
Al(13)
Ar(18)
The atomic mass is usually more than double of the atomic number, Therefore you can confirmed that argon has the highest atomic mass out of the 4 given options
If a piece of blackboard chalk is heated sufficiently, the mass of the chalk decreases substantially, and the chalk is converted into a fine powder. Does this evidence suggest that chemical reaction has taken place
Yes, this evidence suggests that a chemical reaction has taken place.
When the chalk is heated, the bonds between its molecules break and it is converted into a fine powder. This suggests that a chemical reaction has occurred, as the chemical make-up of the chalk has changed.
The heat energy has provided enough energy to break the bonds between the molecules of chalk and they have formed new bonds with other molecules in the process, leading to the formation of a new substance.
The change in the chemical make-up of the chalk is a clear indication that a chemical reaction has taken place.
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consider the combustion of ethane reaction below for the next two questions. 2 c2h6 (g) 7 o2 (g) 4 co2 (g) 6 h2o (g) reaction is at standard temperature and pressure and all reagents are in the gas phase. if we react 14 moles of oxygen with 5 moles of ethane, how many moles of carbon dioxide would we make?
if we react 14 moles of oxygen with 5 moles of ethane, 10 moles of carbon dioxide would we make
From the balanced equation provided, we know that for every 2 moles of ethane that react, 4 moles of carbon dioxide are produced. So, if we have 5 moles of ethane, we can calculate the number of moles of carbon dioxide produced by multiplying the number of moles of ethane by the coefficient of carbon dioxide in the balanced equation. So, 5 moles of ethane * 4 moles of CO2/2 moles of ethane = 10 moles of CO2. A balanced equation is a chemical equation in which the number of atoms of each element on the reactant side is equal to the number of atoms of that element on the product side. This means that the equation shows the correct ratio of the elements that are involved in the reaction. In this case, the balanced equation for the combustion of ethane is 2C2H6 + 7O2 -> 4CO2 + 6H2O
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How many grams are in 2.04 x 10^24 molecules of H2O
Answer: 0.611 grams in 2.04 x 10^24 molecules of H2O
Explanation:
To find out how many grams are in 2.04 x 10^24 molecules of H2O, we need to use the molar mass of water.
The molar mass of water is 18.015 g/mol.
To convert the number of molecules to the number of moles, we multiply by Avogadro's number, which is 6.022 x 10^23 molecules/mol.
2.04 x 10^24 molecules x 1mol/6.022 x 10^23 molecules = 0.034 mol
Then we multiply this number of moles by the molar mass of water to find the number of grams:
0.034 mol x 18.015g/mol = 0.611g
Therefore, there are 0.611 grams in 2.04 x 10^24 molecules of H2O.
Which of the following pairs of elements would be most likely to form an ionic compound Ca and Al Ne and Na CD and Na K and O?
The following pairs of elements would be most likely to form an ionic compound are K and O.
What is an ionic compound?Chemistry defines an ionic compound as a chemical made up of ions held together by electrostatic forces, also referred to as ionic bonding. The compound is generally neutral, but it does contain positively and negatively charged ions known as cations and anions.
In general, compounds where a metal bonds with a non-metal or a semi-metal show evidence of ionic bonding. A compound that is entirely composed of non-metallic elements or semi-metallic elements combined with non-metallic elements and has covalent bonds is known as a molecular compound.
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The decomposition of nitramide, O2NNH2, in water has the following chemical equation and rate law. O2NNH2 (aq) yields N2O (g) + H2O (l) rate= [O2NNH2]/[H]
A proposed mechanism for this reaction is.
k1
(1) O2NNH2 (aq) equilibrium O2NNH (aq) + H (aq) (fast equilibrium)
k-1
k2
(2) O2NNH (aq) yields N2O (g) + OH (aq) (slow)
k3
(3) H (aq) + OH yields H2O (l) (fast)
What is the relationship between the observed value of k and the rate constants for the individual
steps of the mechanism?
k=__________
Also which symbols go into the numerator or demoniator k-1, k3, k2, k1
The molar concentration of reactants raised to the power of their stoichiometric coefficients is called the rate law. This law states the dependency of chemical reactions on reactants.
What is the decomposition of nitramide?In the given decomposition of nitramide in water, it can be stated that third step of reaction is fast and therefore does not contribute to the rate law.
Decomposition reaction is written as: O₂NNH₂ O₂NNH⁻ + H⁺ (fast equilibrium)
Value of K is:
Keq = K₁/K-₁ = [ O₂NNH⁻] [H+]/[ O₂NNH-₂]
Rate= K₂* K₁/K-₁[O₂NNH₂]/[H₂]
Second step of the reaction: O₂NNH₂ O₂N + OH⁻
Rate = K₂ [O₂NNH⁻]
So, [ O₂NNH⁻] = K₁/K-₁[O₂NNH₂]/[H+]
writing the equation in rate constant;
K= K₂K₁/K-₁
Hence, it can be concluded that the third step is fast and does not contribute to rate law.
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What is the mole fraction of water in methanol when 18 grams of h2o is added to 32 grams of methanol, ch3oh?
The statement states that the molar concentration of moisture in methanol is 0.5.
What is the purpose of methanol?Methanol (CH3OH), the most basic alcohol, is a chemical constituent of hundreds of everyday things, including paints, plastics, car parts, and building materials. A clean energy source, methanol also operates liquid fuels, boilers, cook heaters, ships, cars, trucks, and buses. Monoxide and ethanol are the only two varieties of alcohol. Deoxyribose makes up ethanol's chemical makeup, also known as ethyl alcohol. Methanol, often known as organic solvents, has only one carbon atom.
Atomic weight of H₂O=18
Atomic weight of methanol=32
Mole =gram weight/atomic weight
Mole of H₂O = 18/18=1
Mole of CH₃OH =32/32=1
Mole fraction of H₂O = mole of H₂O/mole of H₂O+mole of CH₃OH
Mole fraction of H₂O=1/1+1=1/2=0.5
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a particular reaction is expected to yield 125 g of calcium. the actual amount of calcium obtained is equal to 105 g. calculate the percentage yield for the reaction.
A particular reaction is expected to yield 125 g of calcium, the actual amount of calcium obtained is equal to 105 g, the percentage yield for the reaction is 84%.
What does percent Yield mean?The actual yield is calculated as the theoretical yield divided by the theoretical yield multiplied by 100. It can cause a chemical reactions actual yield to be lower than its theoretical yield.
Utilizing the formula percent yield = actual yield/theoretical yield x 100, we can determine the yield percentage.
Expected yield = 125grams
Obtained yield = 105grams
% yield = (Obtained yield /Expected yield ) × 100
% yield = (105/125) X 100 = 84%.
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I2(aq)+C6H8O6(aq)→C6H6O6(aq)+2I−(aq)+2H+(aq)
The compound C6H8O6 reacts with I2 according to the reaction represented by the equation above. The reaction is correctly classified as which of the following types?
The reaction is correctly classified as Oxidation-reduction, because I2 is reduced.
What is Oxidation?Redox reactions involve a change in the oxidation state of the substrate. When electrons are lost or the oxidation state increases, it is called oxidation; when they are gained or the oxidation state decreases, it is called reduction. When an object comes into contact with oxygen or another oxidizer, a chemical reaction occurs. Rust and the brown color of a cut apple are both examples of oxidation. Oxidation is the process in which a reactant loses electrons during a reaction. Reduction is the term used to describe a reaction in which a reactant picks up electrons. This happens frequently when acid and metals interact. Oxidation is the process in which a reactant loses electrons during a reaction.
Here,
Because I2 is reduced, the reaction is correctly categorized as an oxidation-reduction reaction.
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Define each of the following as atomic element, molecular element, ionic compound, or molecular compound.
A chemical substance that can be divided up into smaller, simpler components is referred to as a compound. They are composed of two or more elements bound together by fixed-strength chemical bonds.
Define and provide an example for each of the following: atomic element, molecular element, ionic compound, molecular compound?An atomic element is defined as a pure substance that has atoms having the same number of protons and neutrons. They can not break further into smaller elements. For example, O, N, C, etc.Molecular elements can be formed by combining two or more elements (they may or may not be the same) by very strong interactions that behave as a single particle. For example, NH3, C6H12O6, etc.When cations (positively charged ions) and anions are combined, they produce an ionic compound (negatively charged ions). The full transfer of electrons can result in the formation of the ionic connection between metals and non-metals. NaCl, LiF, NaF, LiBr, etc. are a few examples.Molecular compounds are formed by the combination of two or more non-metals by sharing electrons between the atoms. The covalent bonds are present in the molecular compounds. For example, H2O, CO2, SF6, etc.Learn more about atomic element refer to :
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For the reaction C + 2H2 → CH4, how many moles of carbon are needed to make 163.1 grams of methane, CH4?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 10.16moles of carbon are needed to make 163.1 grams of methane.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
C + 2H[tex]_2[/tex] → CH[tex]_4[/tex]
moles of methane= 163.1 grams/ 16.04
=10.16moles
the mole ratio between carbon and methane is 1:1
Mole of carbon = 10.16moles
10.16moles of carbon are needed to make 163.1 grams of methane.
Therefore, 10.16moles of carbon are needed to make 163.1 grams of methane.
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for each pair, choose the compound with the larger lattice energy: a. na2o or cao b. cao or cas
Between Na₂O and CaO, the compound with the larger lattice energy is CaO, because Ca²⁺ charge is higher than Na⁺ charge. Between CaO and CaS, the compound with the larger lattice energy is CaO, because they are the same charge but size of O is smaller.
What is lattice energy?Lattice energy can be described as the energy needed to convert one mole of an ionic solid into gaseous ionic constituents. In alternative, it can be described as the energy which have to be supplied to one mole of an ionic crystal in order to separate it into gaseous ions in a vacuum via an endothermic process. The value for the lattice energy is always positive, since it will always be an endothermic reaction.
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the synthesis of ch3oh(g) from co(g) and h2(g) is represented by the equation above. the value of kc for the reaction at 483 k is 14.5. a mixture of co(g) and h2 (g) is pumped into a previously evacuated 2.0 l reaction vessel. the total pressure of the reaction system is 1.2 atm at equilibrium. what will be the total equilibrium pressure of the system if the volume of the reaction vessel is reduced to 1.0 l at constant temperature? (a) less than 1.2 atm (b) greater than 1.2 atm but less than 2.4 atm (c) 2.4 atm (d) greater than 2.4 atm
According to Boyle's law which is a law for constant temperature the the total equilibrium pressure of the system if the volume of the reaction vessel is reduced to 1.0 l is 2.4 atmospheres.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. The statement's formula is: "Certain a given mass of just an ideal gas, the absolute pressure it exerts is proportional to its size. amount of gas remains unchanged.
P∝1/V or PV=K. For a given amount of gas, the equation asserts that perhaps the product of volume and pressure is constant. The equation is valid as long as the temperature is maintained constant.
If both gases are taken into consideration, the equation allows for the determination of the variable pressure and size of any one gas. That is,
P₁V₁=P₂V₂
Substitution in above equation gives P₂=1.2×2/1=2.4 atmospheres.
Hence, the total equilibrium pressure of the system if the volume of the reaction vessel is reduced to 1.0 l is 2.4 atmospheres.
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According to Boyle's law which is a law for constant temperature the the total equilibrium pressure of the system if the volume of the reaction vessel is reduced to 1.0 l is 2.4 atmospheres.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. The statement's formula is: "Certain a given mass of just an ideal gas, the absolute pressure it exerts is proportional to its size. amount of gas remains unchanged.
P ∝ 1/V
or, PV = K
For a given amount of gas, the equation asserts that perhaps the product of volume and pressure is constant. The equation is valid as long as the temperature is maintained constant.
If both gases are taken into consideration, the equation allows for the determination of the variable pressure and size of any one gas. That is,
P₁V₁ = P₂V₂
initial pressure (P₁) = 1.2 atm
initial volume (V₁) = 2.0 L
final volume (V₂) = 1.O L
final pressure (P₂) = ?
Substitution the values in above equation we get -
P₂ = (1.2×2)/ 1
P₂ =2.4 atmospheres.
Hence, the total equilibrium pressure of the system if the volume of the reaction vessel is reduced to 1.0 l is 2.4 atmospheres.
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select the best statement. multiple choice physical changes may be reversed by changing the temperature. physical changes alter the composition of the substances involved. physical properties are not valid characteristics for identifying a substance. physical properties are mostly extensive in nature. physical changes are usually accompanied by chemical changes.
The best statement is: Physical changes may be reversed by changing the temperature.
What physical changes can be reversed?Physical changes which involve a change of state are all reversible. Other changes of state consist of vaporization (liquid to gas), freezing (liquid to solid), and condensation (gas to liquid). Dissolving is also a reversible physical change.
Physical changes are reversible. A change where no new substances are formed can basically be reversed by reversing the conditions is called a physical change.
A physical change includes a change in physical properties. Some examples of physical properties, such as: transition to a gas, change of strength, melting, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
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How much heat is required to increase the temperature of a 125-gram aluminum can (specific heat-0390 g) from 22.2°C to 75.4°C?
Answer:
Explanation: We all have some knowledge of what specific heat is, after all, we have gone through Physics in High School.
It is the amount of heat that required to raise the temperature of a certain substance by a certain amount. The amount of heat depends on the properties of the substance. This means that the amount of heat will vary for different substances.
Specific heat is a measure of how thermally insensitive a substance is when it’s subjected to an addition of energy. This specific heat calculator is a tool to help you calculate the specific heat of different substances.
Energy 63000 joules
Change of tempreture 3 c
mass 5 kg
Answer:Heat energy required is 2593.5 joule energy
Explanation:The formula to calculate heat energy is,
Q=m*c*temperature difference
Q=125*0.390*(75.4-22.2)
Q=2593.5J
Hope the explanation was helpful.
what repeating pattern is noticeable regarding the ionization energies of different elements? how does the periodic table account for this pattern
In groups, the ionization energy drops while increasing from left to right during the course of a period.
What are some instances of ionization?When some chemicals are put to water, such as sodium chloride (NaCl), their molecules breakdown and divide into positive and negative ions. The ionization process is the separation of proteins into negative and positive ions in a solution.
Why does ionization take place?Ionization can happen when an electron is lost as a result of interactions with subatomic particles, atoms, compounds, and ions, as well as electromagnetic fields. Ion pairs may occur as a result of transition state deamination and heterolytic substitution processes.
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chem aleks a chemist carefully measures the amount of heat needed to raise the temperature of a sample of a pure substance from to . the experiment shows that of heat are needed. what can the chemist report for the specific heat capacity of the substance? round your answer to significant digits.
The chemist will state that the chemical has a particular heat capacity of 0.235 J/g K.
How does heat capacity work?The amount much heat energy needed to increase the temperatures of a specific quantity of matter through one degree Celsius is referred to as heat capacity. Heat capacity is a broad attribute that depends on the size or quantity of a specific substance. Joules per Kelvin or joules per degree Celsius are the units used to measure heat capacity.
Mass m = 894.0 g
Initial temperature T = -5.8∘ C
= 267.35 K
Final temperature = T
= 17.5∘ C
=290.65 K
heat capacity =c
Heat required =Q
Q = 4.90 kJ
=4900 J
Q = m×c×ΔT
= 4900J
= 894.0g×c×(290.65K-267.35K)
c = 0.23523 J/gK
= 0.235 J/gK
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How many liters of water are required to dissolve 1.00 g of lead sulfate? Express your answer in liters to three significant figures.
Lead sulfate is soluble in water at a temperature of 20 °C and has a solubility of 0.2275 mg/100 mL.
Lead sulfate's level of toxicityIn humans, lead sulfate is a PROBABLE CARCINOGEN. There is some proof that inorganic compounds induce kidney cancers in animals and lung, brain, stomach, & kidney cancer in people.
What is the purpose of lead sulfate?The mineral anglesite naturally contains lead sulfate. Sulfuric acid is added to a solution of lead salts to create it. Both lithography and fabric weighing employ lead sulfate. Additionally, it serves as just a paint drier.
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There is a lot of extra HCl in your stomatch. Would you use aluminum hydroxide or lithium hydroxide to neutralize it?
Heartburn, acid reflux, and upset stomach are all treated using antacids made of aluminium and magnesium oxide. Patients who suffer from esophagitis, gastritis, or peptic ulcers may utilise them to relieve these symptoms.
Are antacids containing aluminium hydroxide safe?Aluminum hydroxide may increase calcium loss in the urine and stools. A little quantity of aluminium is absorbed from antacids that contain aluminium since aluminium is a hazardous mineral. As a result, few doctors advise routinely taking antacids that include aluminium.
What is the primary drawback of antacid use of aluminium hydroxide gel?Aluminum intoxication, osteomalacia, hypophosphatemia, and constipation are all potential side effects of antacids that contain aluminium hydroxide.
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a 1.0 l sample of a pure gas is found to have a smaller volume than that predicted by the ideal gas law. the best explanation for the observation is that the molecules of the gas:
Since the gas molecules are drawn to one another, they do not press as hard on the container walls as they would if there were no mutual attraction between them.
Describe a molecule.The smallest component of a chemical element or compound, a molecule possesses the chemical characteristics of that element or compound. Atoms are joined together through chemical bonds to make molecules.
How is a molecule created?When more than two atoms come together and form bonds with one another, a molecule is created. Each atom shares an electron when a bond is formed between them. A molecule is created as a result of a covalent bond.
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Write balanced net ionic equations for the reactions that occur when the following aqueous solutions are mixed. If no reaction is likely to occur, so indicate.
Silver nitrate (AgNO3) and calcium chloride (CaCl2): No reaction is likely to occur.
What is reaction?Reaction is the way that one object or organism responds to a stimulus. It can be either physical or psychological and can involve the body's physiological systems, such as the nervous system, or the body's psychological systems, such as the cognitive or emotional system. Reactions are often automatic and instinctive and can occur in response to both external and internal stimuli. Reactions can vary widely and can be either positive or negative. Examples of reactions include fear, anger, joy, disgust, surprise and sadness.
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argon at a pressure 2 atm fills a 100ml vial at a temperature of 0c what would the pressure of the argon be if we increaase the volume to 500ml
The pressure of the argon be if we increase the volume to 500ml is fond to be 0.546atm
How is the pressure of argon could be found from the given parameters?The exact pressure can be calculated using the Ideal gas law PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant and T is the temperature in Kelvin.
P1 v1/T1 = P2v2/T2
=> P2 => 2x 100x 373 /273 x500
=> 0.546atm
What the boyle's law states about the relation between pressure, volume and temperature?The pressure of the argon would decrease if the volume is increased while the temperature is held constant. This is because the pressure of a gas is inversely proportional to its volume, as stated by Boyle's Law. As the volume increases, the pressure decreases. If the temperature is also increased, the pressure will decrease even further, as the gas particles will have more energy and will be moving faster, which will cause them to spread out and fill the larger volume. Therefore, if the volume of the argon is increased from 100ml to 500ml and the temperature is also increased from 0C to 100C, we would expect the pressure to decrease significantly.
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argon at a pressure of 2 atm, fills a 100 ml vial at a temperature of 0C. What would the pressure of the argon be if we increase the volume to 500 ml, and the temperature at 100C?
What are the small chemical units that can combine to form molecules?
The smallest unit which combine together to form a large molecule or a polymer by condensation or addition reaction is Monomer.
A large molecule (macromolecule) built up by repetitive bonding (covalent) of smaller molecules (monomers),Generally not a well defined structure, or molecular weight and Need to use statistical properties to describe.
1)Thermoplastics (plastics) — linear, some cross-linking can be melted and reformed on heating.
a) Amorphous—no ordered structure
b) Semi-crystalline—composed of microscopic crystallites domains of crystalline structure. Can be ordered as fibers (nylon, polyester)
2) Elastomers (rubbers) — moderately cross-linked can be stretched and rapidly recover their original dimension.
3) Thermostats—(resins)—massively cross-linked very rigid; degrade on heating.
4) Dendrimers—multiply branched—multiple consecutive (regular) branches.
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In an ice crystal, any single water molecule typically forms hydrogen bonds with how many other water molecules?
A. 2
B. 3
C. 4
D. 5
E. 6
In the ice crystal, there are four more water molecules.Each water molecule has the ability to create four hydrogen bonds.
Ice crystals: Do they have hydrogen bonds?Water molecules are separated from one another more widely in ice than they are in liquid water due to the regular array of hydrogen bonds that make up the crystalline lattice of ice. This explains why water loses density as it freezes.Each water molecule has the ability to create four hydrogen bonds: two between its hydrogen atoms and the hydrogen atoms of its neighbors, plus two more. In natural ice, these four hydrogen bonds form an ideal tetrahedral arrangement around each water molecule (see right).In the ice crystal, there are four more water molecules.To learn more about hydrogen bonds refer to:
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A 437 ml sample of has a ph of 13. 831. If 641 ml of distilled water was added to the solution what would the new ph of the solution be?
After the water was added, the solution's pH changed to 13.611 distilled water was added to the solution.
What does pH stand for?pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The word translates the values of the hydrogen ion concentration and is used often in chemistry, biology, and agronomy.
What is your typical pH?The pH scale goes from 0 (very acidic) to 14 (neutral) (strongly basic or alkaline). The neutral range on this scale has a pH of 7.0. Blood typically has a pH range of 7.35 to 7.45, making it mildly basic. The pH of blood is typically maintained by the body at or around 7.40.
The solution's total volume
V(total) = 437 ml + 641 ml
V(total) = 1078 ml
Concentration of water
C = (641 ml)/(1078ml)
C = 0.594
pOH = -log(0.594)
pOH = 0.22
New pH of the solution = 13.831 - 0.22 = 13.22
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Suppose I have enough ingredients to make 25 cookies, but when I go to bake them, | only get 18. What percent yield did I obtain?
You obtained a 72% yield. Suppose I have enough ingredients to make 25 cookies.
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They also allow websites to track user behavior and provide a better experience tailored to the user’s needs. Cookies can also be used to track user behaviour across multiple sites, which is useful for targeted advertising. Cookies are essential for many websites to function properly, and they are usually harmless. However, users have the option to disable cookies or delete them at any time.
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How much potassium bromide, in grams, should be added to water to prepare 0.50 L of solution with a molarity of 0.125 M?
Answer: 7.44 g of potassium bromide should be added to water to prepare the solution.
Explanation:
The first thing we need to look for is the key parts of the question.
0.50 L0.125 MSince 0.125 M is a conversion factor we can rewrite it as 0.125 mol/L
When ever you see a question like this, always start with the "given" that's not a conversion factor, which is 0.50 L.
If we start with Liters, we need something to cancel it out to get all the way to grams. By using the conversion mol/L (from the 0.125 M) we can first get to moles.
0.5 L * 0.125 mol/L = 0.0625 mol
After getting to moles, we need to use a conversion factor to get to grams. By using the molar mass ratio (g/mol) we can figure this out. First we need to find the molar mass of Potassium Bromide, then put the units in a way where we can cancel it out. After multiplying the molar ratio (119.002 g/mol) by 0.0625 mol, we get 7.437625 g.
0.0625 mol * 119.002 g/mol = 7.437625 g
Last, we need to put the answer in the correct amount of significant figures.
Significant figures are the number of digits in a value that correlate with the accuracy of that value.
Based on the problem, the significant digits should be to the .01 place, due to 0.125 having the lowest digits of the problem (skip the first 0 because its on the left side of the decimal).
7.437625 g -> 7.44 g
pure gold has a density of 19.600 g/cm3. how large would a piece of gold be if it had a mass of 316.90 g?
The formula for density is:D=M/V,The peice of gold must be: V=16.51 cm^3Au.
Why is density important?
The density of a place refers to the quantity of things—which may include people, creatures, plants, or objects—there are in it. Divide the quantity of objects even by area's measurement to determine density. A country's population density is calculated by dividing its total population by its area, expressed in square kilometres or miles.
In its simplest form, what is density?
We use the word "density" to indicate how much space (or "volume") an object or a substance occupies in terms of the amount of variables contained therein (its mass). Density can also be defined as the quantity of mass in a volume. A hefty, compact object has a high density.
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point(s) where only a gas is present b) temperature at which vaporization occurs c) point(s) where a mixture of a solid and a liquid are present d) point(s) where a gas turns into a liquid e) temperature at which the substance starts to freeze f) range where there is only a liquid
The solution for the above questions are gas phase, boiling point, the solid-liquid (melting point) phase, condensation point, freezing point and liquid phase respectively.
What is vaporization?Vaporization is the process by which a substance is transformed from its liquid or solid state into its gaseous (vapor) state. Boiling is the term for the vaporization process when conditions permit the formation of vapor bubbles within a liquid. Sublimation is the process of directly converting a solid into a vapor.
a) point(s) where only a gas is present: the gas phase
b) temperature at which vaporization occurs: the boiling point
c) point(s) where a mixture of a solid and a liquid are present: the solid-liquid phase boundary
d) point(s) where a gas turns into a liquid: the condensation point
e) temperature at which the substance starts to freeze: the freezing point
f) range where there is only a liquid: the liquid phase
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Phenobarbital (C12 H12 N2Os; M = 232.2g/mol) is a weak acid (pKg = 7.4) used as a sedative and anticonvulsant. This drug is insoluble in water; the concentration of saturated aqueous solutions of this compound is close to 1 g/L pH Homework Unanswered Estimate the pH of a saturated solution of phenobarbital.
The pH of the saturated solution of phenobarbital is 4.9 used as a sedative and anticonvulsant.
The saturated solution is a solution that contains the maximum amount of solute that can be dissolved under the condition at which the solution exists. For saturated solution,
W = 1g
V = 1000ml
M = 232.2 g/mole
Molarity = W * 1000 / M * V
= 1 * 1000 / 232.2 * 1000
= 0.0043 M
pKa = 7.4
Ka = Antilog (-7.4)
= 3.98 * [tex]10^{-8}[/tex]
[tex][H30]^{+}[/tex] = [tex]\sqrt{Ka * C}[/tex]
= [tex]\sqrt{3.98 * 10^{-8} * 0.0043 }[/tex]
= 1.30 * [tex]10^{-5}[/tex]
pH is a measure of hydrogen ion concentration, which in turn is a measure of its acidity.
we know that, pH = - Log [tex][H3O]^{+}[/tex]
putting the value we get, pH = 4.9
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The complete question is,
Phenobarbital [tex]( C_{12} N_{12} N_{2} O )[/tex]; M = 232.2g/mol) is a weak acid (pKg = 7.4) used as a sedative and anticonvulsant. This drug is insoluble in water. the concentration of saturated aqueous solutions of this compound is close to 1 g/L. Estimate the pH of a saturated solution of phenobarbital.
