if a car goes 30.0 miles per gallon of gasoline how many kilometers could it travel on 1 liter of gasoline
Determine the specific heat capacity of an alloy that requires 59.3 kj to raise the temperature of 150.0 g alloy from 298 k to 398 k.
To determine the specific heat capacity of an alloy, use the formula Q = mcΔT and rearrange for c. Substitute the given values and calculate the answer.
Explanation:The specific heat capacity of an alloy can be calculated using the formula:
Q = mcΔT
Where Q is the heat energy, m is the mass of the alloy, c is the specific heat capacity, and ΔT is the change in temperature. Rearranging the formula to solve for c, we have:
c = Q / (mΔT)
Substituting the values given in the question, we get:
c = 59.3 kJ / (150.0 g × (398 K - 298 K))
After performing the calculations, the specific heat capacity of the alloy is obtained.
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The specific heat capacity of an alloy that requires 59.3 KJ to raise the temperature of 150.0 g alloy from 298 K to 398 K is 3.95 J/g·K.
To determine the specific heat capacity (c) of an alloy, we can use the formula:
q = mcΔT
where:
q represents the heat absorbed (in joules)m is the mass (in grams)ΔT is the change in temperature (in Kelvin or degrees Celsius)c is the specific heat capacity (in J/g·K)Given the information:
q = 59.3 kJ = 59,300 Jm = 150.0 gΔT = 398 K - 298 K = 100 KPlugging these values into the formula:
59,300 J = 150.0 g × c × 100 K
Solving for c:
c = (59,300 J) / (150.0 g × 100 K) = 3.95 J/g·K
Therefore, the specific heat capacity of the alloy is 3.95 J/g·K.
When you hear the word decahydrate, what number should be written in front of the formula for water?
Adding a base tends to _____ of a solution. (etext concept 3.3)
Adding a base to a solution reduces its acidity by releasing hydroxyl ions or absorbing H* already present in the solution. The relative strength of a base is indicated by its base-ionization constant, and buffered solutions experience slight changes in pH when acid or base is added.
Explanation:Adding a base to a solution tends to reduce the acidity of the solution. A base is a substance that releases hydroxyl ions (OH) in solution, or one that accepts H* already present in solution. These hydroxyl ions or other basic substances combine with H* to form a water molecule, thereby removing H* and reducing the solution's acidity. This process is reflected in the base-ionization constant (K), which reflects the relative strength of a base in solution. A stronger base has a larger ionization constant than does a weaker base, resulting in a larger reduction in solution acidity. In addition, solutions that contain appreciable amounts of a weak conjugate acid-base pair are known as buffers. These buffered solutions generally experience only slight changes in pH when small amounts of acid or base are added due to their buffer capacity.
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Simple distillation is best used to separate two liquids that have boiling points that differ by
Simple distillation is most effective for separating two liquids when their boiling points differ by more than 100°C. For closer boiling points, fractional distillation is recommended.
Explanation:Simple distillation is best used to separate two liquids that have boiling points that differ by more than 100°C. This method works well to purify mixtures by separating a liquid from non-volatile impurities or from components with significantly greater or lesser boiling points. When the difference in boiling points of the components is less than 100°C, simple distillation cannot achieve significant purification. In such cases, fractional distillation, which involves a fractionating column, is used to enhance purification.
For instance, the distillation of crude oil or the production of alcoholic spirits like brandy and whiskey are applications of distillation that exploit the differences in boiling points to separate mixtures into their components.
[Gradpoint-Question AK-4] Which equation represents a combustion reaction?
A: Ca + 2H Cl -----> CaCl₂ + H₂
B: Pb(NO₃)₂ +2HCl -----> PbCl₂ + 2HNO₃
C: 2SO₂ + O₂ ------> 2SO₃
D: 2C₂H₆ + 7O₂ -----> 4CO₂ + 6H₂O
This question is worth 40 points. So please answer carefully. I'm bad at Chemical equations.
The equation represents a combustion reaction is -
D: 2C₂H₆ + 7O₂ -----> 4CO₂ + 6H₂OA reaction involves a substance reacting with oxygen and releasing energy in form of light or heat, such a chemical reaction is called a combustion reaction.
Burning coal, methane gas, and sparklers are all common examples of combustion reactions2C₂H₆ + 7O₂ -----> 4CO₂ + 6H₂O
Here ethane reacts with oxygen and releases carbon dioxide and water with a high amount of energy. Pb(NO₃)₂ +2HCl -----> PbCl₂ + 2HNO₃ is a double replacement, acid-base reaction. It is also called a neutralization reaction.2SO₂ + O₂ ------> 2SO₃ is a combination reaction that is an example of an oxidation-reduction reaction. Ca + 2H Cl -----> CaCl₂ + H₂ is a single replacement reaction that is also an example of oxidation-reduction reactionThus, the equation represents a combustion reaction is -
D: 2C₂H₆ + 7O₂ -----> 4CO₂ + 6H₂OLearn more:
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The atomic number of nitrogen is 7. nitrogen-15 has a greater mass number than nitrogen-14 because the atomic nucleus of nitrogen-15 contains _____. 8 neutrons 15 protons 7 neutrons 8 protons
Answer: Option (a) is the correct answer.
Explanation:
Atomic number means the sum of total number of protons acquired by an atom.
So, when atomic number of nitrogen is 7 then it means there are 7 protons present.
Whereas atomic mass means the sum of total number of protons and neutrons present in an atom.
Therefore, nitrogen-15 is an isotope of nitrogen that will always have 7 protons when it is neutral in nature. Hence, in nitrogen-15 the number of protons and neutrons are calculated as follows.
Atomic mass = no. of protons + no. of neutrons
15 = 7 + no. of neutrons
no. of neutrons = 15 - 7
= 8
Thus, we can conclude that the atomic nucleus of nitrogen-15 contains 8 neutrons.
Atomic number is the number of protons in an element. Mass number is the total number of protons and neutrons in an element. Thus, to get the number of neutrons in an element, one can subtract the atomic number of an element from the mass number.
Since Nitrogen has an atomic number of 7, the number of neutrons in nitrogen with a mass number of 14 is 14 - 7 = 7 neutrons
The number of neutrons in nitrogen with a mass number of 15 is 15 -7 = 8 neutrons
Thus, the answer to the question is 8 neutrons.
Note: Nitrogen-14 means nitrogen with a mass number of 14 while nitrogen-15 means nitrogen with a mass number of 15
Which of the following is part of the lithosphere?
What is the half-life of a 0.5 g sample of radioisotope that decayed to 0.125 g in 9.6 min?
The half-life of a radioisotope that decayed from 0.5 g to 0.125 g in 9.6 min is 4.8 minutes, calculated by recognizing that two half-lives have occurred within the given timeframe.
The question concerns the calculation of the half-life of a radioisotope based on the amount of material that remains after a certain period of time. The half-life is the time taken for half of the radioactive nuclei in a sample to decay. To determine the half-life, we can apply the formula for exponential decay:
N(t) = N(0) * (1/2)^(t/T)
Where:
N(t) is the remaining quantity of the substance after time t,
N(0) is the initial quantity of the substance,
t is the time that has passed,
T is the half-life of the substance.
In this case, we start with 0.5 g and end with 0.125 g after 9.6 minutes. Since two half-lives have passed to get from 0.5 g to 0.125 g (0.5 g -> 0.25 g -> 0.125 g), we can calculate the half-life as:
9.6 minutes / 2 = 4.8 minutes
Therefore, the half-life of the radioisotope is 4.8 minutes.
Boats typically have several metal fittings where ropes can be fastened. What is the name for these metal fittings?
The metal fittings on boats where ropes can be fastened are called cleats. Cleats are typically made of metal or plastic and are used to secure ropes by wrapping them around the fitting. Cam cleats are a specific type that use cams to grip and release the rope easily.
The metal fittings on boats where ropes can be fastened are called cleats. Cleats come in various shapes and materials, including metal and plastic, and are designed to secure ropes by wrapping them around the fitting. A specific type of cleat often used in sailing is the cam cleat, which uses cams to grip the rope when pulled upward and allows easy release when pulled downward.
In addition to cleats, there are other fittings like bitts and bollards that also serve the purpose of securing ropes on boats. However, cleats are the most commonly used and recognized for this function.
A saturated straight-chain hydrocarbon with two carbons is ____.
Answer:
A saturated sraight-chain hydrocarbon with two carbons is ethane.
Explanation:
Saturated hydrocarbons are called as alkanes with general formula [tex]C_{n}H_{2n+2}[/tex] where n=1,2,3,4......
Now, as it contains two carbon atoms therefore name of this compound should contain a prefix "eth". Also a suffix "ane" will come due to the fact that it is a saturated hydrocarbon.
So, molecular formula of this compound is [tex]C_{2}H_{6}[/tex]
Structure of this straight chain compound has been attached below.
HBr + H₂SO₄ SO₂ + Br₂ + H₂O Did H change oxidation number?
Answer: No, the oxidation state of hydrogen does not change in the given chemical reaction.
Explanation: Balancing the given chemical equation, we get:
[tex]2HBr+H_2SO_4\rightarrow SO_2+Br_2+2H_2O[/tex]
Reactant side:
In HBr, the oxidation state of bromine is -1, so to form a neutral compound, hydrogen should have an oxidation state of +1.
In [tex]H_2SO_4[/tex] , the oxidation state of sulfate is -2, so to form a neutral atom, two hydrogen atoms having +1 oxidation state should combine with it.
Product side:
In [tex]H_2O[/tex], the oxidation state of hydroxide ion is -1, so to form a neutral water molecule, hydrogen should have an oxidation state of +1.
From above, we can say that the oxidation states of hydrogen atom did not change for the following chemical reaction.
What is the difference between organic chemistry and inorganic chemistry ?
Thank you!
How long would it take for 1.50 mol of water at 100.0 ∘c to be converted completely into steam if heat were added at a constant rate of 19.0 j/s ?
[tex]\boxed{{\text{3213}}{\text{.15 s}}}[/tex] will be required to convert 1.50 mol of water completely into steam.
Further explanation:
Enthalpy of vaporization
It is the amount of energy that is required to convert a substance from its liquid state to a vapor or gaseous state. It is also known as the latent heat of vaporization or heat of evaporation. It is represented by [tex]\Delta {H_{{\text{vap}}}}[/tex].
The expression for the heat of vaporization is as follows:
[tex]{\text{q}} = {\text{n}}\Delta {H_{{\text{vap}}}}[/tex] …… (1)
Here,
q is the energy of the substance.
n is the number of moles of the substance.
[tex]\Delta {H_{{\text{vap}}}}[/tex] is the heat of vaporization.
Substitute 1.50 mol for n and 40.7 kJ/mol for [tex]\Delta {H_{{\text{vap}}}}[/tex] in equation (1).
[tex]\begin{aligned}{\text{q}}&= \left( {1.50{\text{ mol}}} \right)\left( {\frac{{40.7{\text{ kJ}}}}{{1{\text{ mol}}}}} \right)\\&= 61.05{\text{ kJ}}\\\end{aligned}[/tex]
The amount of energy is to be converted into J. The conversion factor for this is,
[tex]1{\text{ kJ}} = {\text{1}}{{\text{0}}^3}{\text{ J}}[/tex]
Therefore the amount of energy can be calculated as follows:
[tex]\begin{aligned}{\text{q}} &= \left( {61.05{\text{ kJ}}} \right)\left( {\frac{{{{10}^3}{\text{ J}}}}{{1{\text{ kJ}}}}} \right)\\&= {\text{61050 J}}\\\end{aligned}[/tex]
The time required for conversion of water into steam is calculated as follows:
[tex]\begin{aligned}{\text{Time required}}&= \left( {61050{\text{ J}}} \right)\left( {\frac{{1{\text{ s}}}}{{19{\text{ J}}}}} \right)\\&= 3213.15{\text{ s}}\\\end{aligned}[/tex]
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Thermodynamics
Keywords: enthalpy of vaporization, q, n, 1.50 mol, water, steam, 3213.15 s, 61050 J, 61.05 kJ, 40.7 kJ/mol, liquid state, vapour state, substance, time, amount of energy.
An unsaturated solution is one that ________. an unsaturated solution is one that ________. contains the maximum concentration of solute possible, and is in equilibrium with undissolved solute has no double bonds contains no solute has a concentration lower than the solubility contains more dissolved solute than the solubility allows
A 7th grade science class placed three large grade A eggs into beakers and recorded the mass. They then filled one beaker with vinegar, one with corn syrup, and one with distilled water. After 5 days, they recorded the new masses of the eggs. This can be seen in the chart below. What are the independent variable, dependent variable, and constants?
The heat of reaction for the combustion of c2h4 is -1411 kj/mol. how many grams of c2h4 must burn
Final answer:
To release -1411 kJ of energy, 28.054 grams of [tex]C_2H_4[/tex] needs to burn since the heat of reaction is directly proportional to the amount of the substance.
Explanation:
The question asks for the amount of [tex]C_2H_4[/tex] (ethylene) that needs to be burned given the heat of reaction for its combustion is -1411 kJ/mol. First, it's essential to understand that the heat of reaction indicates how much energy is released (in this case, -1411 kJ) when 1 mole of a substance undergoes a chemical reaction. To find out how many grams of [tex]C_2H_4[/tex] must burn to release a specific amount of energy, one has to relate this energy value to the molar mass of [tex]C_2H_4[/tex].
The molar mass of [tex]C_2H_4[/tex] is 28.054 g/mol, which means 28.054 grams of [tex]C_2H_4[/tex] constitute one mole. Given the energy released is directly proportional to the amount of substance, to release -1411 kJ, one mole or 28.054 grams of [tex]C_2H_4[/tex] needs to burn. If a different amount of energy is desired, the amount of [tex]C_2H_4[/tex] needed can be calculated proportionally based on the given heat of reaction.
What is true of a basic solution at room temperature? it has a ph value below 7. it has a greater concentration of hydroxide compared to hydronium ions. it has a distinct sour taste but an odorless gas. it can be used as a conductor in car batteries?
Select all that apply. choose the two correct statements below. the elements of the halogen family are very reactive because: they readily lose one valence electron. they require only one electron to complete their outer shell. they have a high electronegativity. they form unstable gas molecules.
Answer:
require only one electron to complete their outer shell
have a high electronegativity
Explanation:
The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles
How many moles of co2 are produced when 5.60 mol of ethane are burned in an excess of oxygen?
11.2 moles of co2 are produced when 5.60 mole of ethane are burned in an excess of oxygen.
What do you mean by moles?In chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
The chemical reaction is given by :
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
2 mole C₂H₆ - 4 mole CO₂
5.60 mole C₂H₆ - x
x=5.60*4/2=11.2 mole
Thus, 11.2 moles of co2 are produced when 5.60 mole of ethane are burned in an excess of oxygen.
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1. If 100.0 grams of ethylene glycol are dissolved in 900.0 grams of water, what is the freezing temperature of the solution formed? Follow these steps: Show all of your calculations. Calculate the molar mass of ethylene glycol: 62.07 g/mol Calculate the number of moles of ethylene glycol in the solution: Calculate the molality of ethylene glycol: Calculate the freezing point depression using the Kf from the Chemistry B Information Sheet and the molality that you calculated: Calculate the freezing point of the solution. 2. Think about the result. Think about the typical mid-winter temperature we experience in Michigan. Is this concentration of ethylene glycol high enough to use in a car radiator in the winter? Why or why not? please hurry
Which is the correct formula for phosphorus pentachloride? PCl4 because a subscript of 4 indicates four Cl atoms PCl5 because a subscript of 5 indicates five Cl atoms P5Cl because a subscript of 5 indicates five P atoms P5Cl3 because a subscript of 5 indicates five P atoms
Answer: The correct formula for phosphorous pentachloride is [tex]PCl_5[/tex] because a subscript 5 indicates five chlorine (Cl) atoms.
Explanation: For the given molecule, phosphorous pentachloride, there are 2 atoms present which are phosphorous and chlorine atoms.
Number of phosphorous atoms = 1
Number of chlorine atoms = 5
So, the correct formula for phosphorous pentachloride will be [tex]PCl_5[/tex] because the subscript 5 represents the 5 chlorine atoms.
The correct formula for phosphorus pentachloride is PCl₅. Therefore, option B is correct.
In the compound, phosphorus has a valence of +5, meaning it can form up to five bonds. Each chlorine atom has a valence of -1, allowing it to form a single bond.
By combining one phosphorus atom with five chlorine atoms, each chlorine atom can share one electron with the phosphorus atom, resulting in the formation of five P-Cl bonds.
In the compound, "penta" indicates that there are five chloride (Cl) atoms bonded to the central phosphorus (P) atom. The subscript of 5 in PCl5 represents the number of Cl atoms bonded to each P atom.
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How many atoms are in 15.0 moles of C2H6O
Answer: [tex]813.1\times 10^{23}[/tex] atoms.
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
1 molecule of [tex]C_2H_6O[/tex] contains = 9 atoms
1 mole of [tex]C_2H_6O[/tex] contains = [tex]9 \times 6.023\times 10^{23}=54.21\times 10^{23}[/tex] atoms
Thus 15 moles [tex]C_2H_6O[/tex] contains =[tex]\frac{54.21\times 10^{23}}{1}\times 15=813.1\times 10^{23}[/tex] atoms.
Thus the answer is [tex]813.1\times 10^{23}[/tex] atoms.
How many total carbon atoms are found in a molecule of 3-ethyl-2-pentene? 5 6 7 8?
Answer:
The correct answer is 7.
Explanation:
Given : 3-ethyl-2-pentene (Alkene)
The longest chain in the molecule is of 5 carbon atom. And on second carbon ethyl group is present.In ethyl group there re 2 carbon atoms. So, the total carbon atom in 3-ethyl-2-pentene are 7 carbon atoms.
[tex]CH_2=C(C_2H_5)-CH_2-CH_2-CH_3[/tex]
How many moles of nacl are required to prepare 0.80 l of 6.4 m nacl? 0.13 mol nacl 5.1 mol nacl 7.2 mol nacl 8.0 mol nacl?
Answer:
5.12 moles of NaCl are required to prepare 0.80 L of 6.4 M NaCl.
Explanation:
Molarity (M) is a concentration measure that indicates the number of moles of solute that are dissolved in a given volume.
The Molarity is then determined by:
[tex]Molarity (M)=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units[tex]\frac{moles}{liter}[/tex].
6.4 M NaCl indicates that 1 liter of solution there are 6.4 moles of NaCl.
You can apply a rule of three as follows: if in 1 liter of solution there are 6.4 moles of NaCl, in 0.8 L how many moles are there?
[tex]moles=\frac{0.8 L*6.4 moles}{1 L}[/tex]
moles=5.12
5.12 moles of NaCl are required to prepare 0.80 L of 6.4 M NaCl.
When 7.0 mol Al react with 8.5 mol HCl, what is the limiting reactant and how many moles of AlCl3 can be formed?
2 Al + 6 HCl yields 2 AlCl3 + 3 H2
Al is the limiting reactant; 7.0 mol AlCl3 can be formed
HCl is the limiting reactant; 2.8 mol AlCl3 can be formed
Al is the limiting reactant; 3.5 mol AlCl3 can be formed
HCl is the limiting reactant; 8.5 mol AlCl3 can be formed
B. HCl is the limiting reactant; 2.8 mol AlCl3 can be formed
what quantity and unit are measured using a balance
A Change in matter that can be seen through direct observation are called?
Which substances are acids? Check all that apply
LiOH *HBr *CH3COOH NaCl *H3PO4 Mg(OH)2
* are the correct answers, just took test
The substances listed as HBr, CH3COOH and H3PO4 are acids. Acids are substances that donate protons or H+ ions in solution while bases accept these ions. NaCl is a salt.
Explanation:The substances listed as HBr (hydrobromic acid), CH3COOH (acetic acid), and H3PO4 (phosphoric acid) are all types of acid. These are known as acids because they donate protons, or hydrogen ions (H+) in solution, which is the defining property of an acid based on the Bronsted-Lowry definition of acids and bases. In contrast, substances like LiOH and Mg(OH)2 are bases because they accept H+ ions, and NaCl is a salt, which is typically the product of an acid-base neutralisation reaction.
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