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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how is the density of solid water compared to that of liquid water atypical among substances? why is this significant?
Solid water is less dense as compared to the liquid water, that is why ice floats rather than sinks. This unusual property is because of hydrogen bonding between the molecules.
What is the density of solid water and liquid water?The density of ice is around 90 percent as compared to that of water, but that can vary as ice may also have air. Hence, it implies that around 10 percent of an ice cube will be above water line.
The solid form of most of the substance is denser than liquid phase and so block of most solids will sink in liquid but block of ice floats in the liquid water because ice is less dense. On freezing, density of the water reduces by about 9%.
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The equilibrium for the acid ionization of HC2H3O2 is represented by the equation above. A student wants to prepare a buffer with a pH of 4.76 by combining 25.00mL of 0.30MHC2H3O2 with 75.00mL of 0.10MNaC2H3O2. While preparing the buffer, the student incorrectly measures the volume of NaC2H3O2 so that the actual volume used is 76.00mL instead of 75.00mL. Based on the error, which of the following is true about the buffer prepared by the student
Based on the error, buffer solution will have a slightly higher capacity for the addition of acids than for addition of bases because the amount of C2H3O2− added was higher than the amount of HC2H3O2 added.
What is meant by buffer solution?An aqueous acid or base solution that combines a weak acid with its conjugate base, or vice versa, is known as a buffer solution.
By neutralizing additional acids or bases, buffer solutions keep the pH level steady. A weak acid and its conjugate base make up these compounds, which exchange protons and hydroxide ions to create water. The pH is expressed in terms of the PKa and the ratio of the base to acid concentrations using the Henderson-Hasselbalch equation.
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13. calculate the freezing point and boiling point of an antifreeze solution that is 50.0% by mass of ethylene glycol (hoch2ch2oh) in water. ethylene glycol is a nonelectrolyte.
The Freezing point = 243 K, and Boiling point = 108.250C if antifreeze solution that is 50.0% by mass of ethylene glycol (hoch2ch2oh) in water.
What is the main source of ethylene?petroleum hydrocarbons Over 95% of the worldwide annual commercial production of ethylene is currently based on steam cracking of petroleum hydrocarbons. Various feedstocks, including ethane, propane, butanes, naphthas and gas oils, are used to produce ethylene.
Where is ethylene found?Natural sources of ethylene include both natural gas and petroleum; it is also a naturally occurring hormone in plants, in which it inhibits growth and promotes leaf fall, and in fruits, in which it promotes ripening. Ethylene is an important industrial organic chemical.
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In an experiment, 2.0 moles of oxygen atoms reacts with 80.1 g of calcium to form a new compound. What is the percent composition by mass of each element in the new compound?
Explanation:
The balanced equation for the reaction is:
2 O + Ca → Compound
From the information given, we know that 2.0 moles of oxygen atoms reacts with 80.1 g of calcium. To find the percent composition by mass of each element in the new compound, we first need to determine the molar mass of the compound.
The molar mass of the compound can be calculated by adding up the molar masses of oxygen and calcium.
Molar mass of O = 2 x (16.00 g/mol) = 32.00 g/mol
Molar mass of Ca = 40.08 g/mol
Molar mass of Compound = 32.00 g/mol + 40.08 g/mol = 72.08 g/mol
Now we can use this information to find the percent composition by mass of each element in the compound.
% mass of O = (moles of O x molar mass of O) / molar mass of Compound x 100
% mass of O = (2.0 moles x 32.00 g/mol) / 72.08 g/mol x 100 = 44.68%
% mass of Ca = (moles of Ca x molar mass of Ca) / molar mass of Compound x 100
% mass of Ca = (80.1 g / 40.08 g/mol) / 72.08 g/mol x 100 = 55.32%
So, the percent composition by mass of oxygen in the new compound is 44.68% and the percent composition by mass of calcium in the new compound is 55.32%
how do different molecules exert different force of attraction on each other resulting in different solubilities within different solvents
Chemists use the phrase, "like dissolves like" to describe how varying polarity causes molecules to interact with one another. Both polar and non-polar chemicals will dissolve in other polar and non-polar substances, respectively. Although compounds can have varying degrees of polarity, they are rarely completely polar or non-polar. Different molecules attract each other using different forces, which affects how well they dissolve in various solvents. It is feasible to separate mixtures into their individual components due to variations in solubility.
It is feasible to separate mixtures into their individual components due to variations in solubility. On the other hand, two phases will emerge if the solvent molecules have a significant attraction to one another but minimal affinity for the solute molecules. The well-known fact that oil and water do not mix, or if they do, do not mix for very long, is a typical illustration of the second scenario mentioned in the preceding sentence. Alkanes and other nonpolar molecules make up oil, but polar water molecules may create strong hydrogen bonds with one another.
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Please help I have been stuck for a min
What is the volume of 0.58 moles
of H2 gas at STP
Answer:
13.00 [tex]dm^{3}[/tex]
Explanation:
At S.T.P one mole of any gas requires 22.414 [tex]dm^{3}[/tex].
By setting up mole ratio between moles and volume;
moles : volume
1 : 22.414
0.58 : X
X = 0.58 x 22.414
X = 13.00 [tex]dm^{3}[/tex]
there is 5% (vol/vol) ethanol (c2h5oh) molecules found in a 12-oz (356 ml) bottle of budweiser beer? density of ethanol is 789 kg m-3. how many hydrogen atoms are found in that same bottle of beer?
The same bottle of beer contains 1.09 x 10²⁴ hydrogen atom
The hydrogen atom in the bottle of beer can be calculate as follows:
First we should find the moles of the ethanol
We know that moles = mas / mass molar, but the question give us the density of the ethanol
We also knew that density = mass/ volume
To find the mass of ethanol we should calculate the volume first
Volume of ethanol = 5% = 0.05
Volume of ethanol = 0.05 × 356= 17.8 mL
Density of ethanol = mass/ volume
mass of ethanol = Density x volume
mass of ethanol = 0.789 g/ mL x 17.8 mL = 13. 884 g
Molecular weight of ethanol (C 2H 5OH)=2×12+5+16+1=46 g/ mol
so 46 g C 2H5OH has 6g H
∴13. 884 g C2H5OH = 6 x 13.884 g x 6.02 x 10 ²³= 1.09 x 10²⁴ H atom
46
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Activity 2: My Characteristics
Directions: After exploring the amazing asteroids, comets, and meteors, test yourself if you
can compare and differentiate the three: comets, meteors, and asteroids. Below are some
characteristics of comets, meteors, and asteroids (1-15).
Choose from the following (A-G), and write the letters before each characteristic in your
activity notebook.
A. if it refers to comets
B. if it refers to meteors
C. if it refers to asteroids
D. both comets and meteors
E. if it refers to both meteors and asteroids
F. if it refers to both asteroids and comets
G. if it refers to all (comets, meteors, and asteroid)
Characteristics:
1. Progress across the sky very slowly
2. Known as falling stars or shooting stars
3. Remnants of the formation of the solar system
4. They glow as they enter the earth's atmosphere
5. Reflect sunlight
6. Rocky composition
7. Orbit the sun in highly elliptical orbits s
8. Minor planets
9. Mostly found between Mars and Jupiter
10. Can reach 150 million km in length
11. Most have slightly elliptical orbits
12. The result from the collision of asteroids
13. Streak across the sky very fast
14. Come in all sizes and shapes
15. Icy object
Answers:
ABGBFEACCAGEBGAExplanation:
Progress across the sky very slowly - This characteristic refers to cometsKnown as falling stars or shooting stars - This characteristic refers to meteorsRemnants of the formation of the solar system - This characteristic refers to all (comets, meteors, and asteroid)They glow as they enter the earth's atmosphere - This characteristic refers to meteorsReflect sunlight - This characteristic refers to both asteroids and cometsRocky composition - This characteristic refers to both meteors and asteroidsOrbit the sun in highly elliptical orbits - This characteristic refers to cometsMinor planets - This characteristic refers to asteroidsMostly found between Mars and Jupiter - This characteristic refers to asteroidsCan reach 150 million km in length - This characteristic refers to cometsMost have slightly elliptical orbits - This characteristic refers to all (comets, meteors, and asteroid)The result from the collision of asteroids - This characteristic refers to both meteors and asteroidsStreak across the sky very fast - This characteristic refers to meteorsCome in all sizes and shapes - This characteristic refers to all (comets, meteors, and asteroid)Icy object - This characteristic refers to cometsConsider the following reaction: H2(g)+I2(g)⇌2HI(g) A reaction mixture at equilibrium at 175 K contains PH2=0.958atm, PI2=0.877atm, and PHI=0.020atm. A second reaction mixture, also at 175 K, contains PH2=PI2= 0.617 atm , and PHI= 0.110 atm . Is the second reaction at equilibrium? Is the second reaction at equilibrium? yes no If not, what will be the partial pressure of HI when the reaction reaches equilibrium at 175 K?
The partial pressure of Hi is mathematically P(HI)= 0.0135atm. Yes the reaction is in equilibrium.
The pressure exerted by an individual gas in a mixture is known as its partial pressure.
Each gas in a mixture adds to the overall pressure of the mixture. This portion represents the pressure. The pressure a gas would have if it were in its own volume and at its own temperature is known as the partial pressure.
Generally, the equation for the Reaction
H₂(g) + I₂ (g )↔ 2HI(g)
Therefore
Kp₁ = P(HI)²/ p(H₂)×p(I₂)
Kp₁= (0.02)² / 0.958×0.877
Kp₁= 4.8x10⁻⁴
And
Kp₂ = (0.110)²/ 0.617×0.617
kp₂ = 0.0121 /0.380689
Kp₂= 0.0317
Therefore, for the partial pressure of HI
4.8x10⁻⁴ = P(Hi)² / (0.617×0.617)
P(HI)= 0.0135atm
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Hydrogen bonds form between H2O molecules, but not H2S, H2Se, or H2Te. This explains why:a) H2O is liquid at room temperature while the other compounds are gases.b) H2O is more volatile than the other compounds.c) H2O has the highest molecular weight of all four compounds.d) H2O has a more distinct aroma than the other compounds.
The main reason why hydrogen bonds form between H2O molecules and not between H2S, H2Se, or H2Te molecules is because of their different chemical structures.
H2O consists of two hydrogen atoms and one oxygen atom, while H2S, H2Se, and H2Te consist of two hydrogen atoms and one sulfur, selenium, and tellurium atom, respectively.
Because oxygen has a higher electronegativity than sulfur, selenium, and tellurium, it creates a stronger bond between the hydrogen and oxygen atoms, allowing for the formation of hydrogen bonds.
These bonds are what give H2O its distinct properties, such as its ability to exist as a liquid at room temperature, its volatility, and its higher molecular weight. Additionally, these hydrogen bonds give H2O its distinct aroma, which the other compounds lack.
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What does baking soda have that citric acid doesn't to make bubbles?
Answer:
First lets write down the chemical formula
baking soda:
NaHCO₃
citric acid:
CH3COOH
Lets write the base ionization reaction for NaHCO3
NaHCO3 + H2O -> NaOH + CO2+ H2O
With this equations down, we can clearly see that baking soda produce carbon dioxide gas since H2CO3 dissolves into CO2+ H2O. The required part is HCO3-, where that does not apply to citric acid
contractor jackson 845 rue sherbrooke west montréal qc h3a0g4
The address "845 Rue Sherbrooke West, Montreal, Quebec, Canada" refers to a specific location, in this case, the location of a contractor named Jackson. The address contains the street name "Rue Sherbrooke West" in the city of Montreal, Quebec, Canada.
The 'H3A 0G4' postal code is a code system used to identify specific regions in Canada. Useful for mail sorting and delivery. The first three letters "H3A" represent the Forward Sorting Area (FSA), which usually corresponds to part of a city or county. The last three characters "0G4" represent the Local Delivery Unit (LDU) for a specific building, group of buildings, or single address.
The address of the contractor's office or location where the contractor operates, which may be an office building, workshop, warehouse, etc.
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the fuel used in many disposable lighters is liquid butane, c4h10. butane has a molecular weight of 58.1 g/mol. how many carbon atoms are in 3.50 g of butane?
The total number of carbon atoms in 3.50g of butane is 0.24 mol.
Liquid butane (C4H10) is a commonly used fuel in disposable lighters. Butane has a molecular weight of 58.1g/mol, which means that for every 1 mol of butane, there are 58.1 grams.
To calculate the number of carbon atoms in 3.50 grams of butane, we can use the following equation: Amount (mol) = Mass (g) / Molecular Weight (g/mol).
In this case, 3.50g / 58.1g/mol = 0.060 mol of butane. Since each molecule of butane contains 4 carbon atoms, the total number of carbon atoms in 3.50g of butane is 0.060 x 4 = 0.24 mol of carbon atoms.
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Determine the force in members CD, HI, and CH of the following truss using the method of sections and state if the members are in tension or compression. Also, determine the force in members GF and Ef using the method of joints and state if the members are in tension or compression.
The force in members HI will be in tension, CD will be zero force member, CH will be in compression GF will be in tension and EF will be in compression.
What is the definition of force?In mechanics, a force is any action that has the potential to change, maintain, or distort a body's motion.
Applying equilibrium equations,
∑v = 0
[tex]V_{A}[/tex] + [tex]V_{K}[/tex] = 1500 + 1500 + 1500+ 1500+ 1500
[tex]V_{A}[/tex] + [tex]V_{K}[/tex] = 7500lb
∑m = 0 taking the moment about joint K
[tex]H_{A}[/tex] × 4 = 1500×3 + 1500×6 + 1500×9 + 1500×12 + 1500×15
4[tex]H_{A}[/tex] = 4500lb + 9000lb + 13500lb + 18000lb+ 22500lb
4[tex]H_{A}[/tex] = 67500lb
[tex]H_{A}[/tex] = 67500/4
∑H = 0
[tex]H_{A}[/tex] +[tex]H_{K}[/tex] = 0
[tex]H_{K}[/tex] = -67500/4 = -16876lb
Taking the moment of joint F
[tex]V_{A}[/tex] ×15 + [tex]V_{K}[/tex]×15 + [tex]H_{K}[/tex]×15
-1500×12 -1500×9 -1500×6-1500×3 = 0
15 ([tex]V_{A}[/tex]+[tex]V_{K}[/tex]) + 4 [tex]H_{K}[/tex] = 1500×30
15 ([tex]V_{A}[/tex]+[tex]V_{K}[/tex]) + 4(-16876) = 1500×30
([tex]V_{A}[/tex]+[tex]V_{K}[/tex]) = 7500lb
∑v = 0
[tex]F_{CH}[/tex] Sinθ + 7500 = 0
[tex]F_{CH}[/tex] = -9375lb
[tex]F_{CD}[/tex] + [tex]F_{HI}[/tex] + [tex]F_{CH}[/tex] ×3/5 = 0
[tex]F_{CD}[/tex] + [tex]F_{HI}[/tex] - 9375×3/5 = 0
[tex]F_{CD}[/tex] + [tex]F_{HI}[/tex] = 5625lb
Taking the moment of joint A,
-16875×4 + [tex]F_{HI}[/tex]×4 - [tex]F_{CH}[/tex] Sinθ + 6H = 0
([tex]F_{HI}[/tex] - 16875) ×4 = -9375 ×6×4/5
[tex]F_{HI}[/tex] = 5625lb
[tex]F_{CD}[/tex] = 0lb
member HI will be in tension
CD will be zero force member
CH will be in compression
[tex]F_{GF}[/tex] Sinθ = 1500
[tex]F_{GF}[/tex] = 1500/Sinθ = 1500/4×5
[tex]F_{GF}[/tex] = 1875lb
[tex]F_{EF}[/tex] + [tex]F_{GF}[/tex] Cosθ = 0
[tex]F_{EF}[/tex] = - [tex]F_{GF}[/tex] Cosθ
[tex]F_{EF}[/tex] = - 1875×3/5
[tex]F_{EF}[/tex] = - 1125lb
GF will be in tension and EF will be in compression.
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Complete question is attached below.
The solubility in water of ionic compound is measured and found to be at . Calculate the volume of a saturated solution of in water that would contain of at this temperature. Be sure your answer has the correct unit symbol and significant digits.
The solubility in water of ionic compound is measured and found to be at, In order to equal 34.0g of X, the volume of a saturated solution of X in water is 43.9 ml.
The amount of solute that dissolves in 100 ml of the solvent at a specific temperature is known as solubility.
Given: Ionic substance X dissolves in water at a rate of 0.776 g/ml
One ml of X contains 0.774 g of X.
Thus, = contains 34.0 g of X.
Therefore, 43.9 ml is the volume of a saturated solution of X in water that contains 34.0g of X.
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A cheetah can run 68-75 miles per hour! Would this be considered an instantaneous speed, a
constant speed, or an average speed? Explain.
Answer:
This would be considered an average speed, as it's an estimate of how fast the cheetah can run over a certain distance, taking into account variations in its speed. It's not instantaneous, which would refer to the speed at a specific moment, and it's not constant, which would refer to the same speed being maintained over a period of time.
Calculate the equilibrium constant for the reaction, at 25°CCu(s) + 2Ag+ (aq) → Cu+2 (aq) + 2Ag (s)at 25oC, Eocell = 0.47 V, R = 8.134 JK−1 F = 96500 C is
The equilibrium constant for the reaction is 8.5* 10^15.
What does chemical equilibrium mean?Chemical equilibrium is characterized as an active condition in which the concentration of each reactant remains constant. While they might not be equal, they are not altering. A double arrow in a chemical process denotes an equilibrium state. Products are on the right while reactants are to the left.
What are equilibrium and an example?The Latin term libra, which meaning weight or balance, is the origin of the word equilibrium. Several instances of equilibrium include: a book that is open and at rest. a vehicle that is going steadily. a chemical process where both the forward and backward rates of reaction are equal.
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How many grams of C4H10 must I burn to produce .86 grams of waterHelp me i need this done ASAP im taking my final rn
Answer: 0.545 grams of [tex]C_{4} H_{10}[/tex] on burning will give 0.86 grams of water.
Explanation: The molecular mass of water is 18 grams/mole.
therefore, 0.86 grams of water = 0.86/18 (mass/molecular weight)
= 0.047 moles
Now, by unitary method :
Since by the equation, We can already tell 10 moles of water is produced by burning 2 moles of C_{4} H_{10}.
∴ 10 moles of water → 2 moles of C2H10
1 mole of water → 2/10 moles of C2H10
0.047 Moles of water → 0.047 x (2/10) moles of C2H10
∴ We will need 0.0094 Moles of C2H10 to produce 0.86 grams of water which is 0.545 Grams (moles x Molecular mass = required weight)
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Predict the immediate effect of the following changes on the observed cell voltage, E.H2(g) + PbCl2(s) <–> Pb(s) + 2HCl (aq)Delta H standard rxn > 0Matcha) Dissolve NaOH into solutionb) Increase the temperaturec) Increase the amount of PbCl2d) Dilute the solution by adding H2Oi) Increased Eii) Decreased Eiii) No change in E
A) No change in E. Adding NaOH does not affect the cell voltage as it does not change the concentrations of the reactants or products.
What is cell voltage?Cell voltage is the electrical potential difference between two points in a cell. It is the amount of energy needed to move a unit charge from one point to the other. It is measured in volts (V). Cell voltage is an important parameter for battery efficiency, because it affects the amount of current that can be drawn from the battery, as well as its capacity. Cell voltage is determined by the chemical reaction taking place inside the cell, as well as the design of the cell and its components.
b) Increased E. Increasing the temperature increases the rate of the reaction, which causes the cell voltage to increase.
c) Increased E. Increasing the amount of PbCl2 increases the rate of the reaction, which causes the cell voltage to increase.
d) Decreased E. Diluting the solution by adding H2O decreases the concentrations of the reactants and products, which slows down the reaction rate and decreases the cell voltage.
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Draw the structure of 4-isopropyl-2,4,5-trimethylheptane and identify the primary, secondary, and tertiary hydrogens.
The primary, secondary, and tertiary hydrogens should be indicated on a diagram of the structure of 4-isopropyl-2,4,5-trimethylheptane. Hydrocarbons: Organics include hydrocarbons.
Which statement regarding the structure of 4 benzyl 2 4 5-trimethylheptane is true?Response and Justification: 4-Isopropyl-2,4,5-Trimethylheptane is the supplied substance. Heptane, a chain with seven carbons, is its parent chain. The methyl group, CH3, is bound each of the heptane's second, fourth, and fifth carbons, as implied by the term 2,4,5-trimethyl.
In chemistry, what does skeletal structure mean?The succession of atoms joined together to produce the compound's fundamental structure is known as the skeletal system of an organic complex. Chains of bound atoms, branches, and/or rings can make up the skeleton.
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how many molecules of ethanol ( c2h5oh ) (the alcohol in alcoholic beverages) are present in 185 ml of ethanol? the density of ethanol is 0.789 g/cm3 .
In 185 ml of ethanol, there are 1.7043 * [tex]10^{24}[/tex] molecules of ethanol (c2h5oh), the alcohol found in alcoholic beverages.
Is ethanol an alcohol substitute?Alcohols are organic compounds made of the elements hydrogen (H), oxygen (O), and carbon (C). Alcohol with 2 carbons is referred to as octane (also known as ethyl alcohol). Beer, wine, and vodka all include the kind of alcohol known as ethanol.
mass = density * volume
mass = 0.789 * 185
mass = 145.965 g
Then, using the formula C2H5OH, get the molecular weights of ethanol:
mass of H = 1
mass of C = 12
mass of O = 16
Mr = 2*12 + 1*16 + 6*1
Mr = 46 g/mole
Now you can determine how many moles are present in that mass:
# of moles = mass / Mr
# of moles = 130.185/ 46
# of moles = 2.83 moles
From there, you would analyze how many molecules there are:
# of molecules = moles * NA
# of molecules = 2.83 * 6.0221415 * 10^23
# of molecules = 1.7043 * 10^24
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4al 3o2 --> 2al2o3 which mole ratio describes how much oxygen is required to produce 10 moles of product?
The mole ratio 2/3 describes 15 moles of oxygen is required to produce 10 moles of product.
The mole ratio is what?In a balanced chemical reaction, the ratio of any two compounds' mole amounts—measured in moles—is known as the mole ratio. In the balance chemical equation, the ratios of the molecules required to complete the reaction are compared.
Given chemical reaction,
4Al + 3O₂ → 2Al₂O₃
As per the equation 2 moles of aluminum oxide produces 4moles of aluminum and 3 moles of Oxygen.
The ratio of Al to oxygen = 2moles/3moles = 2/3
no moles of oxygen × 2/3 = 10 moles of Al₂O₃
no moles of oxygen = 10 × 3/2
no moles of oxygen = 30/2
no moles of oxygen = 15.
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a piece of titanium metal with a mass of 20.8g is heated in boiling water to 99.5 o c and then dropped into a coffee cup calorimeter containing 75.0g of water at 21.7 o c. when thermal equilibrium is reached, the final temperature is 24.3 o c. calculate the specific heat of titanium.
The the specific heat of titanium is 0.524 J g-1 °C-1.
What is specific heat, exactly?The amount of heat required to increase the temperature of 1 gram of a substance by 1 degree Celsius (°C) is known as specific heat. Since water has a higher specific heat than other substances, it requires more energy to raise its temperature.
q = m × C × ΔT
q = m × C × (T_f - T_i),
where:
q = amount of heat energy gained or lost by substance
m = mass of sample
C = specific heat capacity (J g-1 °C-1)
T_f = final temperature
T_i = initial temperature
The specific heat capacity of water is 4.20 J g-1 °C-1
2) Therefore:
q_lost by titanium = (20.8 g) × C_titanium × (24.3 - 99.5)°C
q_lost by titanium = -1564.16 × C_titanium
q_gained by water = (75.0 g) × (4.20 J g-1 °C-1) × (24.3 - 21.7)°C
q_gained by water = 819
-q_lost by titanium = q_gained by water
-(-1564.16 × C_titanium) = 819
C_titanium = (819) / (1564.16) = 0.5236 = 0.524
C_titanium = 0.524 J g-1 °C-1
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you have 0.5 l of air at 203 k in an expandable container at constant pressure. you heat the container to 273 k. what is the volume of air? responses 0.25 l 0.25 l 0.37 l 0.37 l 0.67 l 0.67 l 1.5 l
The volume of air at 273 K would be 0.67 L by Gas Law. The ideal gas law, a state equation for all gases, states: PV is equal to nRT, where n is the number of moles of the gas and 8.314 joules per kelvin per mole is the universal (or perfect) gas constant.
According to the Ideal Gas Law, all gases have an equal number of molecules when they are at the same temperature, pressure, and volume (but not the same mass)
V1=0.5 L
T1=203 K
T2 = 273 K
V2 = unknown.
Now, [tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
So,
0.5L/203 = V2/273
V2= 0.67 L
So, Volume of gas will be 0.67 L.
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calculate the grams of ethane present in a sample containing 0.1066 moles if the molar mass of ethane is 30.067 g/mol.
The grams of ethane present in the sample is approximately,
m = 3.2051 unit.
The number of atoms, molecules, and ions that make up a material is measured in moles. Any atom has 6.022 x 1023 molecules in a mole. We use the mole to quantitatively determine the size of the tiniest entities, much as we use a standard value to compute various things, such as 1 dozen Equals 12 items.
So now,
Number of moles = mass of substance / Molar mass of the substance.
n=m/M
0.1066 = m / 30.067
Multiply both sides by 30.067.
0.1066 x 30.067 = ( m / 30.067 ) x 30.067.
m = 3.2051 unit.
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5.an experiment requires 2mm ascorbic acid in a final volume of 100mls. how much of a 1m stock of ascorbic acid and how much water are needed to make this?
20ul of a 1M stock of ascorbic acid and 100mls of water is needed to make 2mm of ascorbic acid in a final volume of 100mls
To make a 2mm solution of ascorbic acid in a final volume of 100mls, we first need to calculate how many moles of ascorbic acid are required. We can use the formula:
molarity = moles of solute / liters of solution
Given that we need 2mm of ascorbic acid, we can calculate the number of moles of ascorbic acid required: 2mm = 2 x 10^-3 molar
We are told that the final volume is 100mls = 0.1Lmoles of ascorbic acid = molarity x liters of solution = 2 x 10^-3 x 0.1 = 2 x 10^-4 moles
To make a 1M stock solution, we know that 1 mole of solute is dissolved in 1 liter of solvent.
volume of 1M stock solution = moles of solute / 1 = 2 x 10^-4 moles / 1 = 2 x 10^-4 L = 20 ul.
The total volume of the final solution is 100mls = 0.1L. The volume of the 1M stock solution is 20ul = 2 x 10^-5L. So the volume of water needed for the final solution is:0.1L - 2 x 10^-5L = 0.09998 L ≈ 100mls So, you need 20ul of a 1M stock of ascorbic acid and 100mls of water to make 2mm of ascorbic acid in a final volume of 100mls.
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what is the mass (in kg) of 6.89 × 1025 molecules of co2? the molar mass of co2 is 44.01 g/mol. (Show work on scratch paper) o 5.04 kg o 6.39 kg o 3.85 kg o 3.03 kg o 2.60 kg
The mass of the molecule of CO₂ is 5.04 kg
Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10²³units / mole.
It is used to make very large number easier to handle.
Firstly we will calculate the moles of CO₂
As, 6.022 x 10²³ molecules of CO₂ is present in 1 mole of CO₂
So, 6.89 × 10²⁵ molecules of CO₂ present in mole of CO₂will be found as
6.89 × 10²⁵/6.022 x 10²³ = 114.4 moles of CO₂
Now we have to calculate the mass of CO₂
mass = moles × molar mass
mass =114.4 moles× 44.01 g/mol
mass = 5.034 Kg
So it will be nearly equal to 5.04kg
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How many significant figures are there in the following number? 801.5
There can be 4 significant figures in the number given, i.e., 801.5.
What are significant numbers?In positional notation, significant figures are the digits in a number that are trustworthy and required to denote the amount of something.
Significant figures are the number of digits that add to the correctness of a value, frequently a measurement.
The first non-zero digit is where we start counting significant figures. Determine how many significant digits there are given a range of numbers.
A number's first zeros are not significant if their primary purpose is to contain the decimal point. Only when there are decimal points in the numerical quantities can trailing zeroes qualify as significant figures; otherwise, they do not.
Thus, as the position of zero is in between the digits, so it can be counted in significant number. So, it have 4 significant figures.
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In the lab, you looked at speed-time graphs to determine the acceleration of the cart for each of the three fan speeds. What was the acceleration of the cart with Low fan speed
In the lab, you looked at speed-time graphs to determine the acceleration of the cart for each of the three fan speeds. The acceleration of the cart with Low fan speed is 18 cm/s².
The acceleration of the cart with Low fan speed is :
The acceleration is given as :
a = ( Vf - Vi ) / (t f - t i )
by substituting the value in the acceleration formula , we get:
a = 125 - 0 / 7
a = 125 / 7
a = 18 cm/s²
Thus the acceleration of the cart with the low fan speed is 18 cm/s².
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the chemical secreted into the gap between neurons at a synapse
The chemical secreted into the gap between neurons at a synapse is called the neurotransmitter.
Neurotransmitters - Chemicals released by neurons following an action potential. Neurotransmitters travel across synapses to excite or inhibit target neurons. Different types of neurons use different neurotransmitters and thus have different effects on their targets. There is a small gap between the axon terminal of the presynaptic neuron and the membrane of the postsynaptic cell, this gap is called the synaptic cleft. A chemical synapse uses the release of chemical neurotransmitters to pass signals from one neuron (presynaptic) to another (postsynaptic). Synapses contain small gaps that separate neurons.
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