Final answer:
The complete combustion of 1.0 mole of C4H10 (butane) in excess oxygen will produce 4 moles of carbon dioxide (CO2).
Explanation:
To determine how many moles of carbon dioxide (CO₂) are produced when 1.0 mole of C₄H₁₀ (butane) is completely burned in excess oxygen, we need to first write and balance the chemical equation for the combustion of butane. The balanced chemical equation for the combustion of butane is:
C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O
This equation shows that 1 mole of butane reacts with 6.5 moles of oxygen to produce 4 moles of CO₂ and 5 moles of water (H₂O). Therefore, the complete combustion of 1.0 mole of C₄H₁₀ will produce 4 moles of carbon dioxide.
When atoms are split, from which part of the atom is the energy released?
nucleus
electrons
isotopes
Answer: Option (a) is the correct answer.
Explanation:
It is known that an atom consists of three sub-atomic particles which are protons, neutrons, and electrons.
When an atom splits then only neutrons and protons are involved and no electrons are involved into the reaction.
Hence, energy is released by the nucleus of the atom. And, these type of reactions reactions are known as nuclear reactions.
For example, [tex]^{16}_{8}O + ^{1}_{1}n \rightarrow ^{13}_{7}N + ^{4}_{2}He[/tex]
Whereas isotopes are the species which have same atomic number but different mass number.
Thus, we can conclude that when atoms are split, from nucleus of the atom is the energy released.
Which event would likely cause an agrarian society to begin developing irrigation techniques that conserve water?
A. A shortage of fossil fuel resources
B. The emergence of a new crop disease
C. A period of drought
D. An increase in air pollution
Answer: C. A period of drought
Explanation:
A drought is a natural hazard which occurs when a region receives below average precipitation, the region experiences a shortage of water due to the sources of water like lakes, ponds and river get dry. The region is affected by hot and dry climatic conditions, soil becomes compact and looses it's fertility.
C. A period of drought will cause the agrarian society to begin developing the irrigation techniques required to conserve water. As, the agriculture is necessary practice to meet the food requirement of large human population the drought conditions may pose difficulty in irrigating the agricultural field.
Answer:
A period of drought
Explanation:
got it right on a.p.e.x
What is the oxidation state of an individual nitrogen atom in nh4oh ? express the oxidation state numerically (e.g., +1)?
The oxidation state of an individual nitrogen atom in NH4OH is -3, determined by the rules for assigning oxidation states, where hydrogen is +1 and the ammonium ion has an overall charge of +1.
Explanation:The oxidation state of an individual nitrogen atom in NH4OH can be calculated using the rules for assigning oxidation states. The compound NH4OH consists of the ammonium ion (NH4+) and the hydroxide ion (OH-). To find the oxidation state of nitrogen, we consider that hydrogen generally has an oxidation state of +1 when combined with nonmetals and oxygen has an oxidation state of -2. In NH4+, with four hydrogen atoms, each hydrogen atom contributes +1, for a total of +4. To balance this and give the overall charge of the ammonium ion (+1), the nitrogen must have an oxidation state of -3.
Furthermore, in OH-, the oxygen has an oxidation state of -2, and the single hydrogen has an oxidation state of +1. But since we are only interested in the nitrogen atom, we focus only on the NH4+ part of NH4OH. So, the oxidation state of an individual nitrogen atom in NH4OH is -3.
Write a balanced equation for the combustion reaction that occurs between propane and oxygen. and limiting reactant
Final answer:
The balanced chemical equation for the combustion of propane is C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l). To find the limiting reactant, convert the mass of the reactants to moles, then compare the mole amounts to the ratio in the balanced equation.
Explanation:
Combustion of Propane
The balanced chemical equation for the combustion of propane is:
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
To determine the limiting reactant, compare the mole ratio of the reactants to the amounts you have. For propane and oxygen, the mole ratio is 1:5. In the given problem, 30.0 g of propane (C3H8) reacts with 75.0 g of oxygen (O2). First, convert the mass of each reactant to moles using their molar masses (propane: 44.10 g/mol, oxygen: 32.00 g/mol). Then compare the mole amounts given the ratio required by the balanced equation. The reactant that provides the smaller number of moles required by the ratio is the limiting reactant.
You need to measure the brightness of a light bulb using the metric system. In which unit do you express your measurement?
A. meter
B. liter
C. kilogram
D. candela
***My answer: D. Candela
because candela is the unit of light intensity...
idk if that applies here?? :) please explain!! thanks :)
Why does a blue shirt look blue? Choose the BEST explanation.
Question 2 options:
The shirt reflects all wavelengths of light.
All wavelengths of light are absorbed by the shirt.
The shirt absorbs the blue wavelengths.
The shirt reflects the blue wavelengths.
One cup of kidney beans contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate. how many kilocalories, to two significant figures, does this sample contain? (the caloric values are: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.)
One cup of kidney beans with 15 g of protein, 1 g of fat, and 42 g of carbohydrate contains approximately 237 kilocalories, when calculated using the given caloric values for each macronutrient.
Explanation:To calculate the number of kilocalories in a cup of kidney beans that contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate, we can use the given caloric values of 4 kcal/g for carbohydrates, 4 kcal/g for protein, and 9 kcal/g for fat.
The total kilocalories can be calculated as follows:
Carbohydrate kilocalories = 42 g × 4 kcal/g = 168 kcalProtein kilocalories = 15 g × 4 kcal/g = 60 kcalFat kilocalories = 1 g × 9 kcal/g = 9 kcalAdding these together gives:
168 kcal from carbohydrates + 60 kcal from protein + 9 kcal from fat = 237 kilocalories in total.
Therefore, one cup of kidney beans contains approximately 237 kilocalories, to two significant figures.
Which of these items best describes the arrangement of electrons in an atom of sulfur? A. Two electrons in its first energy level; eight electrons in its second energy level; six valence electrons in its outermost energy level B. Two electrons in its first energy level; two electrons in its second energy level; eight electrons in its third energy level; four valence electrons in its outermost energy level C. Two valence electrons in its first energy level; eight electrons in its second energy level; six electrons in its outermost energy level D. Eight electrons in its first energy level; eight valence electrons in its outermost shell
THE ANSWER TO THIS QUESTION IS B IF YOU USING PF
During pyruvate processing, two carbons from pyruvate combine with ____. see section 9.3 (page 197) .
Find the theoretical yield of silicon monocarbide if 50.0 grams of silicon dioxide reacts with carbon. then, calculate the actual amount of silicon monocarbide produced in the lab if the percent yield was 87.2%. (work backwards to find actual yield.)
Final answer:
The theoretical yield of SiC from 50.0 grams of SiO2 is 33.36 grams, and the actual yield is 29.07 grams, based on an 87.2% percent yield.
Explanation:
The theoretical yield of silicon monocarbide (SiC) can be calculated from the stoichiometry of the reaction between silicon dioxide (SiO2) and carbon (C). Given that 50.0 grams of SiO2 are reacting, we first convert this mass to moles using the molar mass of SiO2 (60.08 g/mol). The balanced chemical equation for the reaction is:
SiO2(s) + 3C(s) → SiC(s) + 2CO(g)
Next, we determine the moles of SiC that can be produced from the moles of SiO2, and convert those moles to grams to find the theoretical yield of SiC. To calculate the actual yield, we use the percent yield (87.2%) and apply it to the theoretical yield.
The steps are:
Convert 50.0 grams of SiO2 to moles: n(SiO2) = 50.0 g / 60.08 g/mol.
Use the stoichiometry of the reaction to determine moles of SiC.
Convert moles of SiC to grams, which is the theoretical yield.
Multiply the theoretical yield by the percent yield (87.2%) to determine the actual yield of SiC.
The theoretical yield: n(SiO2) = 50.0 / 60.08 = 0.832 moles of SiO2, which theoretically yields 0.832 moles of SiC since the molar ratio between SiO2 and SiC is 1:1. Now, using the molar mass of SiC (40.10 g/mol), the theoretical yield in grams: 0.832 moles × 40.10 g/mol = 33.36 grams of SiC. The actual yield of SiC is then calculated as: 33.36 g × 87.2% = 29.07 grams.
Given that the vapor pressure of water is 17.54 torr at 20 °c, calculate the vapor-pressure lowering of aqueous solutions that are 2.20 m in (a) sucrose, c12h22o11, and (b) aluminum chloride. assume 100% dissociation for electrolytes.
= [tex]\frac{1000}{18} = 55.55[/tex]
Molarity of the solution = 2.2
The amount of water = moles of solvent
Mole fraction[tex]\frac{55.55}{55.55+2} =0.9619\\\\[/tex]
From Raoults law
Vapor pressure = mole fraction * vapor pressure
= 17.54*0.9619
= 16.87 torr
Lowered vapor pressure
17.54 - 16.87
= 0.67 torr
2. Mole fraction of solvent[tex]\frac{55.55}{55.55+2.2*2} =0.93[/tex]
0.93*17.54 = 16.31
17.54-16.31 = 1.23
The lowered vapor with NACl = 1.23
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What is the mass of a 10.0 ml sample of urine with a specific gravity of 1.04?
A sample of neon occupies a volume of 375 ml at stp. What will be the volume of neon If the pressure is reduced to 90.0 KPA?
A. 422 ml
B. 422 L
C. 333 ml
D. 333 L
At STP conditions value of absolute pressure is 101.325 kPa.
From the given data we can determine the new volume of neon using following proportion:
V : V1 = p : p1
375 : V1 = 101.325 : 90
101 * V1 = 90 * 375
V1 =33750/101 =333ml
What is the osmotic pressure of a 0.065 molar aqueous NaCl at 298 Kelvin?
Answer:
3.179 atm
Explanation:
Osmotic pressure is expressed as:
π = iMRT , Where
π = osmotic pressure
i = van't Hoff factor
M = molar concentration
R = universal gas constant (0.08206 L·atm/mol·K )
T = absolute temperature in K
In this case, i = 2, M = 0.065, R = 0.08206 and T = 298. Substitute into the formula:
π = 2 x 0.065 x 0.08206 x 298
= 3.179 atm
The osmotic pressure is 3.179 atm.
The solar system formed from the
A. grouping together of asteroids.
B. explosion of an interstellar sun.
C. collision of two massive stars.
D. collapse of an interstellar cloud.
The ksp of cadmium carbonate, cdco3, is 1.0 × 10-12. calculate the solubility of this compound in g/l.
The solubility of cadmium carbonate, CdCO3, in a 0.010-M solution of cadmium bromide can be calculated using the compound's Ksp value. The molar solubility is found to be 1.0 × 10^-6 M. Converting this to grams per liter gives a solubility of 1.724 × 10^-4 g/L.
Explanation:The solubility of cadmium carbonate, CdCO3, can be determined using the Ksp value. The Ksp value represents the product of the concentrations of the dissolved ions in a saturated solution. In this case, the Ksp of CdCO3 is 1.0 × 10^-12. Since the compound dissociates into Cd2+ and CO3^2- ions, the solubility can be calculated by assuming x as the molar solubility of CdCO3. Thus, [Cd2+] = x and [CO3^2-] = x. Plugging in these values into the Ksp expression, we get:
(x)(x) = 1.0 × 10^-12
x^2 = 1.0 × 10^-12
x = √(1.0 × 10^-12) = 1.0 × 10^-6 M
Since the question asks for the solubility in g/L, we need to convert the molar solubility to grams per liter. We can use the molar mass of CdCO3, which is approximately 172.4 g/mol. Therefore, 1.0 × 10^-6 M is equivalent to 1.724 × 10^-4 g/L.
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How many calories of heat energy are required to melt 20 grams of ice at 0 °c?
A group of engineers run a trial test on a space probe built for measuring the surface temperature of the sun. After the trial, the engineers realize that the probe melted and failed to collect the needed data. What should the engineers do next?
Explanation:
Probe melted because the material used in the making of the probe was not that much resistant to the high temperature of the sun. So, now they have to design a probe with material which should have very high resistance to a high temperature so that the probe does not get melt again.
Which renewable energy source depends on changing water levels?
guyys .... please this is really urgent.....................short definition for sea breeze and land breeze.......10 points
A sea breeze is a wind that blows from the sea to the warmer land during the day, while a land breeze blows from the land to the sea at night due to differences in temperature creating distinct pressure areas.
Land Breezes and Sea Breezes Defined
A sea breeze is a local wind pattern that occurs during the day or summer when the land heats up faster than the water. As a result, lower pressure forms over the land, drawing cooler, higher pressure air in from the sea towards the land to replace the rising warm air. Conversely, a land breeze occurs at night when the land cools down more quickly than the water, creating higher pressure over the land and lower pressure over the water.
This causes air to move from the land out towards the sea. Both phenomena are examples of land/sea breezes which occur due to differential heating and cooling of land and water, creating pressure gradients that drive local winds.
what is the sequence in which energy is converted to allow a gasoline-powered car to move.
The energy conversion or the energy transformation is the process of changing one form of energy to another , the energy produces certain changes within a system , Changes in the total energy of systems can only be accomplished by adding or removing the energy from them as the energy is a quantity which is conserved ( unchanging ) .
The internal combustion engine in the car converts the potential chemical energy in gasoline and oxygen into thermal energy which is transformed into the mechanical energy that accelerates the vehicle ( increasing its kinetic energy ) by causing the pressure and performing the work on the pistons .
number of grams in four moles of BaCO3
How is density of a substance related to its mass and volume?
Part a use valence bond theory to devise a hybridization and bonding scheme for co2. match the words in the left column to the appropriate blanks in the sentences on the right. make certain each sentence is complete before submitting your answer.
A 425-ml sample of hydrogen is collected above water at 35°c and 763 torr. find the volume of the hydrogen sample when the temperature falls to 23°c, assuming the barometric pressure does not change. (vapor pressures of water : at 35°c, 42.2 torr ; at 23°c, 21.1 torr)
Volume of hydrogen sample at [tex]23^\circ\text{C}[/tex] is [tex]\boxed{419.4\text{ mL}}[/tex].
Further Explanation:
Ideal gas equation:
A hypothetical gas comprising of many randomly moving particles having perfectly elastic collisions between them is called ideal gas. The expression for ideal gas equation is mentioned below.
[tex]\text{PV}=\text{nRT}[/tex] ...... (1)
Here,
P is the pressure of gas.
V is the volume of gas.
T is the absolute temperature of gas.
n is the number of moles of gas.
R is the universal gas constant.
At temperature [tex]\text{T}_{1}[/tex] , volume [tex]\text{V}_{1}[/tex] and pressure [tex]\text{P}_{1}[/tex] , ideal gas equation for hydrogen gas modifies as follows:
[tex]\text{P}_{1}\text{V}_{1}=\text{nRT}_{1}[/tex] ...... (2)
At temperature [tex]\text{T}_{2}[/tex] , volume [tex]\text{V}_{2}[/tex] and pressure [tex]\text{P}_{2}[/tex] , ideal gas equation for hydrogen gas modifies as follows:
[tex]\text{P}_{2}\text{V}_{2}=\text{nRT}_{2}[/tex] ...... (3)
Dividing equation (3) by equation (2),
[tex]\dfrac{\text{P}_{2}\text{V}_{2}}{\text{P}_{1}\text{V}_{1}}=\dfrac{\text{T}_{2}}{\text{T}_{1}}[/tex] ...... (4)
Rearrange equation (4) to calculate .
[tex]\text{V}_{2}=\dfrac{{\text{P}_{1}\text{V}_{1}\text{T}_{2}}}{\text{P}_{2}\text{T}_{1}}[/tex] …… (5)
The value of [tex]\text{P}_{1}[/tex] can be calculated as follows:
[tex]\begin{aligned}\text{P}_{1}=&763\text{ torr}+42.2\text{ torr}\\=&805.2\text{ torr}\end{aligned}[/tex]
The value of [tex]\text{P}_{2}[/tex] can be calculated as follows:
[tex]\begin{aligned}\text{P}_{2}=&763\text{ torr}+21.1\text{ torr}\\=&784.1\text{ torr}\end{aligned}[/tex]
The value of [tex]\text{T}_1[/tex] can be calculated as follows
[tex]\begin{aligned}\text{T}_1=&\left(35+273.15\right)\text{ K}\\=&\ 308.15\text{ K}\end{aligned}[/tex]
The value of [tex]\text{T}_2[/tex] can be calculated as follows
[tex]\begin{aligned}\text{T}_2=&\left(23+273.15\right)\text{ K}\\=&\ 296.15\text{ K}\end{aligned}[/tex]
Substitute 805.2 torr for [tex]\text{P}_{1}[/tex] , 425 mL for [tex]\text{V}_{1}[/tex] , 784.1 torr for [tex]\text{P}_{2}[/tex] , 308.15 K for [tex]\text{T}_{1}[/tex] and 296.15 K for [tex]\text{T}_{2}[/tex] in equation (5).
[tex]\begin{aligned}\text{V}_{2}&=\dfrac{\left({805.2\text{ torr}\right)\left(425\text{ mL}\right)\left(296.15\text{ K}\right)}}{\left(784.1\text{ torr}\right)\left(308.15\text{ K}\right)}\\&=419.4\text{ mL}\end{aligned}[/tex]
Therefore volume of hydrogen sample at [tex]23^\circ\text{ C}[/tex] comes out to be 419.4 mL.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Ideal gas equation
Keywords: ideal gas equation, R, T, n, P, V, T1, T2, P1, P2, V1, V2, 419.4 mL, pressure, volume, universal gas constant.
The nucleus of an isotope of sulfur contains 34 neutrons. what is the atomic number of this isotope?
Through a process known as electrolysis, water can be split into hydrogen and oxygen. What type of reaction is this? Give an explanation for your choice.
The amount of heat needed to raise 25 g of a substance by 15°C is 293 J. What is the specific heat of the substance? Use the equation C = q/mΔT.
a.) 0.13 J/g-°C
b.) 0.20 J/g-°C
c.) 0.78 J/g-°C
d.) 0.46 J/g-°C
Answer:
0.78 J/g-°C is the correct answer
Explanation:
All chemical reactions convert one substance into another. select one:
a. true.
b. false.
No atoms are destroyed or made into new ones. When reactants come into touch with one another, the bonds between their atoms are broken, and the atoms then reorganize and establish new bonds to create the products. This statement is false.
What is chemical reaction ?
In a chemical reaction, one or more substances also known as reactants are changed into one or more additional substances also known as products. Chemical elements or chemical compounds make up substances.
A chemical change, often known as a chemical reaction, is the process by which one or more substances are converted chemically into another.
A drug combining with another substance may be necessary in this situation. It could also entail a material disintegrating into other substances.
Thus, option B is correct.
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PLEASE HELP!
The location of the dot is _____.
Latitude/Longitude
30° N/60° W
30° N/60° E
60° N/30° W
60° N/60° E
Answer:
the answer is D: 60o N/60o E
Explanation:
sorry i had to but a o for a degrees sign :)
Answer:
it is a. 30° N/60° W
Explanation: