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The main reasons why h2co has a higher vapor pressure at a given temperature when compared to ch3oh is that h2co
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The number of atoms in 8.93 g of zinc ?
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Zinc has a molar mass of about 65.38 g/mol. So we calculate the number of moles first:
moles Zinc = 8.93 g / (65.38 g/mol) = 0.1366 mol
We can calculate for the number of atoms using Avogadros number.
atoms Zinc = 0.1366 mol * 6.022 x 10^23 atoms / mol
atoms Zinc = 8.23 x 10^22 atoms
Which two body systems contribute to acid-base balance of blood?
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Final answer:
The respiratory and renal systems are crucial in maintaining the acid-base balance of blood, by managing the levels of CO2 and bicarbonate, respectively.
Explanation:
The two body systems that contribute to the acid-base balance of blood are the respiratory system and the renal or excretory system. The primary blood buffer system is carbonic acid/hydrogen carbonate, which aids in maintaining the blood pH within a narrow range. The respiratory system regulates blood pH by exhaling carbon dioxide (CO2), while the renal system adjusts blood pH through the excretion of hydrogen ions (H+) and the conservation of bicarbonate (HCO3-). These two systems play a vital role in the acid-base homeostasis by removing excess acids or bases from the body.
Assume that 50.0 cal of heat is applied to a 15 g sample of sulfur at 20°C. What is the final temperature of the sample if the specific heat of sulfur is 0.175 cal/(g • °C)?
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Heat = mC(T2-T1)
50.0 cal = 15 g (0.175 cal/g-C) (T2-T1)
T2-T1 = 19.05 C
T2 = 19.05 + 20
T2 = 39.05 C
How do chemical weathering and the formation of biochemical sediment remove carbon from the atmosphere and store it in the geosphere?
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Chemical weathering and the formation of biochemical sediment remove carbon from the atmosphere by releasing carbon dioxide through the breakdown of rocks. This carbon dioxide can then be stored in the geosphere as biochemical sediments.
Explanation:Chemical weathering and the formation of biochemical sediment play a crucial role in removing carbon from the atmosphere and storing it in the geosphere. Chemical weathering refers to the breakdown of rocks and minerals through chemical reactions, which releases carbon dioxide into the atmosphere. This carbon dioxide can then be dissolved in water and can react with other compounds to form biochemical sediments, such as calcium carbonate. These sediments eventually become part of the geosphere, storing carbon for long periods of time.
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A 3.52g sample of chromium metal reacts with fluorine to produce 7.38g of metal fluoride. What is the mass % of Cr in the metal fluoride?
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What volume would 4 moles of gas occupy at stp? do this without a calculator. you may need to use longhand calculations. the question is designed to tolerate reasonable rounding?
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= 4 × 22.4
22.4
4
= 89 .6
OR
split it up; what you need to find is 22.4 × 4
So 22 x 4 = 88
0.4 × 4 = 1.6
88 + 1.6 = 89.6
which term best describes the rate at which glacial erosion takes place
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What is a substance that contains only a single type of atom
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A 0.2 m solution of a weak acid ha dissociates such that 99.4% of the weak acid remains intact (i.e., remains as ha). what is the pka of the weak acid?
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0,2-x.........x..........x
100% - 99,4% = 0,6% = 0,006
x = 0,6%×0,2 = 0,006 × 0,2 = 0,0012
HA --------------> H(+) + A(-)
0,2-x.....................x..........x
0,2-0,0012.....0,0012..0,0012
0,1988.............0,0012..0,0012
K = [H+][A-]/[HA]
K = (0,0012)^2/0,1988
K = 0,0000072434
pKa = -logK= -log0,0000072434 = 5,14
:)
The pKa of a weak acid can be determined using the equation: pKa = -log10(Ka). In this case, we are given that 99.4% of the weak acid remains intact, which means that only 0.6% has dissociated. Therefore, we can calculate the equilibrium concentration of HA by multiplying the initial concentration of HA by 0.006.
Explanation:The pKa of a weak acid can be determined using the equation: pKa = -log10(Ka), where Ka is the acid dissociation constant. In this case, we are given that 99.4% of the weak acid remains intact, which means that only 0.6% has dissociated. Therefore, we can calculate the equilibrium concentration of HA by multiplying the initial concentration of HA by 0.006.
Since the [HA] is equal to the [HA]₀ * 0.006, we can use this calculated equilibrium concentration along with the given Ka value to find the pKa.
For example, let's assume the initial concentration of HA is 0.2 M. The equilibrium concentration of HA would be 0.2 M * 0.006 = 0.0012 M. Using the equation pKa = -log10(Ka), we can find the pKa value.
A kind of sedimentary rock formed from plant material over a long period of time is __________.
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A kind of sedimentary rock formed from plant material over a long period of time is __________.
A kind of sedimentary rock formed from plant material over a long period of time is coal. Coal is a fossil fuel as well.
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atp is a modified nucleotide used for cellular for energy that contains what sugar
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ATP is a modified nucleotide used for cellular energy that contains the ribose sugar.
Further explanation
Ribose
It is a sort of sugar that is created by the body. It is utilized as a medicine. Ribose is utilized by mouth to diminish chest torment and improve heart work in individuals with coronary course illness.
ATP (Adenosine triphosphate)
It is an instant energy source. It is called as the energy currency of the cell. It is used as a coenzyme in many processes. ATP is synthesized during Krebs cycle and glycolysis. Mitochondria and chloroplast are involved in the production of ATP. ATP is involved in the active transport of molecules, in the processes like muscle contraction, protein synthesis and Calvin cycle. We synthesize 60 Kg of ATP per day. ATP is a large molecule but its energy lies in the terminal phosphate bond. ATP provides energy to cell by breaking its phosphate bond. By breaking one phosphate group ATP is converted to ADP molecule but it can be regenerated. ATP is also consumed by plants in the process of photosynthesis. Animals use ATP in the breakdown of carbohydrate and lipids. In fact, it is the principal molecule used in biochemical reactions.
Structure of ATP
ATP is composed of adenine which is a purine base, a ribose sugar and three phosphoric acid molecules. It also has ester linkage and high energy phosphate bond.
Phosphate bond is highly reactive bond but when it reacts with nucleoside, adenosine it becomes less reactive.
Answer details
Subject: Chemistry
Level: College
Keywords
Ribose Adenosine triphosphate Structure of ATPLearn more to evaluate
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4. Which one of the following groups of chemical compounds is composed entirely of organic compounds? A. Ch3OCH3, Ca3(PO4)2, CO2, H2CO3 B. C2H2, CH4, CaCl2, CaCN2 C. C2H4O, CH2O, CaSO4, C3H5(OH)3 D. C6H6, C2H5OH, C6H5CH3, C3H5(NO3)3
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In every other answer choice there was at least one inorganic compound:
In the other optionsCaSO4, CaCl2, Ca3(PO4)2 are not organic
I hope this helps!!
Answer: The correct answer is Option D.
Explanation: Organic compounds are defined as the compounds which have hydrogen and carbon atoms in it. They are also known as hydrocarbons.
From the given options:
Option 1: [tex]Ca_3(PO_4)_2\text{ and }CO_2[/tex] are not organic compounds because these two compounds do not contain hydrogen element in it.
Option 2: [tex]CaCl_2\text{ and }CaCN_2[/tex] are not organic compounds because these two compounds do not contain hydrogen and carbon elements in it.
Option 3: [tex]CaSO_4[/tex] is not an organic compound because this compound do not contain hydrogen and carbon elements in it.
Option 4: All the compounds contain hydrogen and carbon elements in it and hence, all the compounds are organic compounds.
Therefore, the correct option is Option D.
A 0.100 g sample of a carbon–hydrogen–oxygen compound is combusted in a stream of pure oxygen and produces 0.220 g co2 and 0.239 g h2o. what is the mass percent of hydrogen in the sample?
a.13.3
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First we assume that the compound containing only C,H,and O is combusted completely in the presence of excess oxygen, so that the only things that can be produced are water and carbon dioxide.
From there we should back calculate the amount of Hydrogen that is in the original sample by taking all of the hydrogen in the 0.239g to came from the organic compound.
And since we know that the original mass of the sample was .100g, we can also easily get a mass % H by taking the mass Hydrogen calculated over the total original mass (.100 g)
So that:
0.239g H2O / (18.01 g/mol) = .01327 moles H20
.01327 Moles H20 * 2.02g H (per every mole H2O) = .0268g H initially present in the sample
.0268g H / .100g sample = 26.8% H by mass
The mass percent of hydrogen in the 0.1 g sample of compound containing carbon–hydrogen–oxygen is 26.6%
We'll begin by calculating the mass of the hydrogen in the compound. This can be obtained as follow:
Molar mass of H₂O = (2×1) + 16 = 18 g/mol
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass H₂O produced = 0.239 g
Mass of H =?Mass of H = [tex]\frac{2}{18} * 0.239[/tex]
Mass of H = 0.0266 gFinally, we shall determine the mass percent of Hydrogen in the compound. This can be obtained as follow:
Mass of H = 0.0266 g
Mass of compound = 0.1
Mass percent of H =?[tex]Percentage = \frac{mass}{mass of compound} * 100\\\\= \frac{0.0266}{0.1} * 100[/tex]
Mass Percent of H = 26.6%Thus, the mass percent of hydrogen in the sample is 26.6%
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Iki indicator tests for the presence of which substance? benedict's reagent tests for the presence of which substance?
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Iki also known as Lugol's solution, is an indicator used to test for the presence of starch. Benedict's reagent is used to test for the presence of reducing sugars, such as glucose and fructose
Lugol's solution is a yellow-brown solution that turns blue-black in the presence of starch.
Benedict's reagent is a clear blue solution that changes color to green, yellow, orange, or red, depending on the amount of reducing sugar present. Benedict's test is commonly used in the laboratory to detect the presence of reducing sugars in various substances.
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how many reference points are needed to make a thermometer scale?
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A chemical that causes a sudden, almost instantaneous release of pressure, gas, and heat when subjected to sudden shock, pressure, or high temperatures best describes which type of DOT hazardous materials classification?
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Answer:
The correct answer is class I explosives.
Explanation:
An explosive refers to a chemical, which leads to a sudden, almost immediate discharge of gas, pressure, and heat when exposed to sudden pressure, shock, or high temperature. These are unstable substances and are primarily of two kinds.
The type one comprises of substances possessing the tendency of undergoing supersonic reactions, like TNT and nitroglycerin. The other kind comprises substances, which burn briskly, however, at a subsonic rate. The examples are rocket propellants, gunpowder, and fireworks.
Which of the following correctly describes the relationship between speed and velocity?
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which element on the periodic table contains 5 valence electrons and is a metalloid
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What would the % p, on the npk ratio, be reported as for a 100g sample containing 7.5g of phosphorous?
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%P = 7.5 g/100 g * 100 = 7.5%
Ans: 7.50% of P
Given:
Mass of NPK sample = 100 g
Mass of P in sample = 7.5 g
To determine:
The % P in the given sample
Explanation:
The percent of a particular substance (say,X) in a given total amount (M) is generally expressed as:
% X = [Mass of X/Total mass]*100
In this case:
%P = [mass of P/mass of NPK sample]*100
= [7.5/100]*100 = 7.5%
Give the symbol of the element that has the largest atomic size in group 3a (13).
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Final answer:
Thallium, being the heaviest member of Group 13, will have the largest number of electron shells, which makes its atomic radius the largest of the group.
Explanation:
The element in Group 3A (13) with the largest atomic size is thallium, which has the symbol Tl. Atomic size generally increases from top to bottom within a group on the periodic table due to the addition of electron shells.
Thallium, being the heaviest member of Group 13, will have the largest number of electron shells, which makes its atomic radius the largest of the group.
The element with the largest atomic size in Group 3A (13) is thallium (Tl), as atomic size increases down a group.
The box holds 70 cm3 of water. Water has a density of 10 g/cm³. What is the mass of the water
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Density = 10 g/cm³
Mass of water = ?
By using the following formula we can calculate mass of the water;
Density = Mass ÷ Volume
Now putting the values;
10 gcm³ = Mass ÷ 70cm³
Mass = 10 x 70
Mass = 700g
A new element is discovered that is very unstable and highly reactive, and it likes to lose its one valence electron. in what group should this element be placed in? explain.
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If a sample containing 2.50 ml of nitroglycerin (density=1.592g/ml) is detonated, how many total moles of gas are produced?
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What is the mass (in grams) of 9.79 × 1024 molecules of methanol (CH3OH)?
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Since, we know the avagadro number is 6.02 x 10²³, we only have two unknown values left which are the molecular mass of CH3OH and its mole.
Molecular Mass: C = 12, H= 1, O = 16, since we have C=12, H4 = 4, O = 16, we will add them up: 12 + 4 + 16 =32
We know that one mole of anything = 6.02 x 10²³.
So we will use this formula to find the mole of methanol: Number of moles = Number of molecules / Avagadro number
Number of moles of CH3OH = (9.79 x 10^24)/6.02 x 10²³) = 16.263 moles.
Now we know that the molecular mass = 32 and the mole is = 16.263.
Now we can find its mass by using this formula: Mass in grams = Number of moles x Molecular mass of 1 mole.
Mass in grams = 16.263 x 32 = 520g
Final answer:
To find the mass of methanol, divide the number of molecules by Avogadro's number to get moles, then multiply by molar mass. The mass of 9.79 × 10²⁴ molecules of methanol is 520.64 grams.
Explanation:
To calculate the mass of 9.79 × 10²⁴ molecules of methanol (CH₃OH), first, we need to determine how many moles of methanol there are. Since 1 mole of any substance contains 6.02 × 10²³ molecules (Avogadro's number), we can use this to find the number of moles:
Moles of methanol =
9.79 × 10²⁴ molecules / 6.02 × 10²³ molecules/mol
This calculation reveals that there are 16.27 moles of methanol. Next, we use the molar mass of methanol, which is 32.0 g/mol, to find the mass:
Mass of methanol = 16.27 moles × 32.0 g/mol = 520.64 grams. Therefore, 9.79 × 10²⁴ molecules of methanol have a mass of 520.64 grams.
How does acetaldehyde impurity arise in the fermentation?
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This finds its way to the fermented products because in the process of fermentation, this is naturally produced in one of the intermediate step that would convert the sugars to carbon dioxide and ethanol. Depending on the strain of the bacteria that acts on the substrate then, this may be formed in large quantities. Acetic acid bacteria (AAB) has a high tendency of producing large quantity or favor the production of acetaldehyde.
Answer:
Explanation:
Acetaldehyde is a colorless, volatile liquid with a pungent and suffocating smell. It is produced as a result of the oxidation of ethyl alcohol to acid or acetic fermentation. Its formula is: CH3CHO formula.
Acetaldehyde occurs naturally in alcoholic beverages. In excess, however, it resembles the smell and taste of an immature green apple.
Fermentation is a process that degrades molecules to transform them into other simpler molecules.
The most frequent causes for which the impurity of acetaldehyde can be generated in fermentation:
It can be caused by the strain of yeast used. To avoid this, a suitable yeast strain should be chosen for the fermentation process. Due to the premature termination of fermentation: In this case it can occur in two different ways: Due to the depletion of must oxygen due to temperature changes and premature flocculation: Acetaldehyde is an intermediate compound in the formation of alcohol, if fermentation stops at the time of the transformation of glucose into alcohol at the stage of acetaldehyde, it produces a fruity flavor and aroma (green apple). For the exposure of alcohol to oxygen: Causing its oxidation and giving immature green apple flavors. Contamination by infection of the bacterium (acetobacter): It is produced as a byproduct of the end of fermentation when part of ethyl alcohol is transformed due to the action of Acetobacter, a genus of aerobic bacteria. For this reason it is convenient that the oxygen level is low at this stage of the fermentation so that the bacteria do not act.The molecular mass of the compound is 90 amu. What is the molecular formula for C2H5O?
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First let us get the molecular mass of the compound C2H5O.
C has molar mass of 12 amu, H is 1 amu, while O is 16 amu, therefore:
C2H5O = 12 amu * 2 + 1 amu * 5 + 16 amu = 45 amu
So to get 90 amu, simply double all the elements, therefore:
C4H10O2
Let us assume that the given formula of elements is empirical formula where elements have simplest whole number ratio
The empirical mass = 2 X atomic mass of carbon + 5 X atomic mass of hydrogen + at mass of O
The empirical mass = 2 X 12 + 5 + 16 = 45
The ratio of molecular mass and empirical mass = 90 / 45 = 2
Molecular formula is obtained by multiplying the empirical formula with this ratio / factor
molecular formula = 2 X (C2H5O) = C4H10O2
Ions how are ions made from neutral atoms worksheet answers
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Final answer:
Ions are created when neutral atoms either lose or gain electrons, forming cations and anions, respectively. The periodic table helps predict the charges of ions depending on their group, where alkali metals form +1 cations, alkaline earth metals form +2 cations, and halogens form -1 anions. The formation of ionic compounds involves the combination of these oppositely charged ions to achieve electrical neutrality.
Explanation:
Ions are formed when atoms gain or lose electrons. When a neutral atom loses one or more electrons from its valence shell, it becomes a cation (a positive ion). Conversely, when it gains one or more electrons in its valence shell, it becomes an anion (a negative ion).
Charges of Ions and Ionic Compounds:
The periodic table can be a tool for predicting the charges of many ions based on their group. For instance, alkali metals form +1 ions, while alkaline earth metals form +2 ions. Halogens typically form -1 ions. Ionic compounds consist of these positive and negative ions in a ratio that balances their total charges, resulting in an electrically neutral compound.
Electron Configurations and Ion Charges:
It's important to note that ions only form through the movement of electrons, not protons. For elements within the same group on the periodic table, the number of valence electrons determines the common ion charge. Elements will either reach a stable electron configuration by losing or gaining electrons to form ions.
Aside from carbon and hydrogen, which are always present in organic molecules, what are some other substances they may contain?
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Aside from carbon and hydrogen, organic molecules may contain oxygen and nitrogen.
At 25 °c and 785 torr, carbon dioxide has a solubility of 0.0351 m in water. what is its solubility at 25 °c and 1510 torr?
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The solubility of carbon dioxide in water at 25 °C increases from 0.0351 m at 785 torr to approximately 0.0675 m at 1510 torr.
The solubility of a gas in a liquid is described by Henry's Law, which states that at a constant temperature, the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid.
Using this law, we can calculate the solubility of carbon dioxide (CO₂) in water at a different pressure while keeping the temperature constant at 25 °C.
At 785 torr, the solubility of CO₂ is 0.0351 m. According to Henry's Law, the solubility (S) can be calculated using the formula S₁/P₁ = S₂/P₂, where S₁ and S₂ are the solubilities at pressures P₁ and P₂, respectively.
If the pressure is increased to 1510 torr, we can find the new solubility (S₂) as follows:
S₂ = S₁ x (P₂/P₁)
= 0.0351 m x (1510 torr / 785 torr)
= 0.0351 m x (1510/785)
= 0.0351 m x 1.9235671
= 0.067533 m (approx)
The solubility of CO₂ at 25 °C and 1510 torr is approximately 0.0675 m.