For the following reasons, brine is a more potent de-icing solution than solid ice melt products: Because brine freezes at a lower temperature than water, it can remain liquid at lower temperatures.
The typical use of brine, a salt-water solution, includes uses as a de-icing agent, a food preservative, and a source of minerals for industrial processes. Brine is a substance that is used in de-icing to either stop the growth of ice or to melt already-existing ice on sidewalks, highways, and other surfaces. It functions by bringing down water's freezing point, which causes ice to melt at lower temperatures. Compared to solid ice melt products, which may contain chemicals damaging to the environment, brine is typically seen as a more cost- and environmentally-friendly de-icing method. Brine is a common choice for de-icing applications since it is simple to prepare and use.
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In going from room temperature (25 C) to 20 C above room temperature, the rate of reaction triples. Calculate the activation energy for the reaction .
Answer: 67890iuhnm, m
Explanation:b ghjit6789 k k
The density of muscle tissue is approximately 1.055 g/mL. How many grams of muscle tissue would be contained in 24 mL of muscle tissue?
If the earth is 1.50X108 Km from the sun, what is the distance
in Gm?
Answer:
1.50 Gm
Explanation:
The distance from the Earth to the Sun can be converted from kilometers to gigameters (Gm) by dividing by 10^9:
1.50 x 10^8 km / 10^9 = 1.50 Gm
So, the distance from the Earth to the Sun is 1.50 Gm.
ALLEN
a specie with initial concentration 1.4×10^-2 mol L-1 decay by first order kinetics with a rate constant 2.35×10^2L mol-1 s-1. what is the half-life if this specie?
Answer:
293 ms
Explanation:
The half-life of a first-order reaction can be calculated using the following formula:
t1/2 = 0.693 / k
Where t1/2 is the half-life and k is the rate constant.
For this reaction, the rate constant is 2.35 x 10^2 L/mol/s, so:
t1/2 = 0.693 / (2.35 x 10^2 L/mol/s) = 0.293 / (2.35 x 10^2) s = 0.000293 s = 293 ms
Answer:
0.293 / 2.35 × 10^2 seconds.
Explanation:
The half-life of a first order reaction can be calculated using the equation:
t1/2 = 0.693 / k
where t1/2 is the half-life, k is the rate constant, and 0.693 is the natural logarithm of 2.
Substituting the values given in the question:
t1/2 = 0.693 / 2.35 × 10^2 L mol-1 s-1 = 0.293 / 2.35 × 10^2 s
So, the half-life of the species is approximately 0.293 / 2.35 × 10^2 seconds.
In the laboratory, a student adds 14.0 g of manganese(II) nitrate to a 250. mL volumetric flask and adds water to the mark on the neck of the flask. Calculate the concentration (in mol/L) of manganese(II) nitrate, the manganese(II) ion and the nitrate ion in the solution.
[Mn(NO3)2] = ?M
[Mn2+] = ?M
[NO3-] = ?M
The number of moles of 14 g of manganese nitrate is 0.078 moles. Then molarity of the solution is 0.312 M. The molarity of Mn²⁺ in the solution is 0.312 M and the molarity [NO₃⁻] is 0.624 M.
What is molarity ?Molarity of a solution is the ratio of number of moles of the solute to the volume of solution in liters. It is the common term for representing the concentration of a solution.
Molar mass of manganese nitrate = 178.9 g/mol
no.of moles in 14 g = 14/178.9 = 0.078 moles.
then molarity of [Mn (NO₃)₂] = 0.078/0.25 L = 0.312 M.
In one mole of the solution there is one mole of Mn²⁺.
then [Mn²⁺ ] = [Mn (NO₃)₂] = 0.312 M.
One mole of the compound contains 2 moles of the nitrate ions. Hence,
[NO₃⁻] = 2 × 0.312 = 0.626 M.
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The chemical formula for cesium chloride is Cs Cl.
A chemist measured the amount of cesium chloride produced during an experiment. She finds that 30.8 g of cesium chloride is produced. Calculate the number
of moles of cesium chloride produced.
Round your answer to 3 significant digits.
The number of moles of cesium chloride produced 0.183 moles.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
According to this question, the chemical formula for cesium chloride is CsCl. A chemist measured the amount of cesium chloride produced during an experiment. She finds that 30.8 g of cesium chloride is produced.
The molar mass of Cesium chloride is 168.36 g/mol
Moles = 30.8g ÷ 168.36g/lol
moles = 0.183 moles
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Which answer choice BEST explains why the cyclist must be fed if she wants to continue to pedal her bike?
A. All of her stored chemical energy was transformed.
B. She was hungry.
C. She destroyed all of her chemical energy while riding her bike.
D. She needed to create more stored chemical energy.
10. What is lost in an atom as a result of radioactive decay? What equation relates this loss to
energy produced? (1 pt)
Mass that is number of protons and neutrons is lost in an atom as a result of radioactive decay.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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What is the mass of 4.00cm ^ 3 of sodium with density = 0.97g / cm?
Answer:
he given density is 0.97 g/cm³, and the volume is 4.00 cm³.
To find the mass, we can use the formula:mass = density x volume
Substituting the given values,
we get:mass = 0.97 g/cm³ x 4.00 cm³mass = 3.88 g
Therefore, the mass of 4.00 cm³ of sodium with a density of 0.97 g/cm³ is 3.88 g.
Explanation:
Question 6 of 10
Which shows an isomer of the molecule below?
O A.
OB.
O C.
O D.
The molecule D shows an isomer of the molecule given below. Therefore, option D is correct.
What is an isomer ?The term Isomer is defined as the compounds that contain exactly the same number of atoms, i.e., they have exactly the same empirical formula, but differ from each other by the way in which the atoms are arranged.
Isomerism is the phenomenon in which more than one compounds have the same chemical formula, but they have different chemical structures.
Therefore, given molecule and D molecule are isomers of each other because they have the same number of atoms, but they differ in arrangement of the atoms.
Thus, option D is correct.
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A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. She uses 5 different widths of copper wire and attaches each to a multimeter to measure
the resistance in the wires. The data collected is shown below.
Wire 1-12 Ohms
Wire 2-17 Ohms
Wire 3-9 Ohms
Wire 4-14 Ohms
Wire 5-6 Ohms
What is the independent variable in this experiment?
A. The multimeter.
B. The resistance values.
C. The material of the wires, copper.
D. The widths of the wires.
The independent variable is the the widths of the wires.
What is the independent variable?
In an experimental setup, the independent variable is the variable that is manipulated or changed by the researcher. It is also referred to as the "predictor variable" or the "explanatory variable."
The idea behind manipulating the independent variable is to observe its effect on another variable, which is called the dependent variable. The dependent variable is the variable that is thought to be affected by the independent variable.
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Which statement best describes the difference between a physical change and a chemical change? Responses A chemical change results in a new element being formed, and a physical change results in a new compound being formed. A chemical change results in a new element being formed, and a physical change results in a new compound being formed. A physical change produces a new element, and a chemical change results in a bond breaking between atoms. A physical change produces a new element, and a chemical change results in a bond breaking between atoms. A chemical change does not result in a new substance being formed, whereas a physical change does. A chemical change does not result in a new substance being formed, whereas a physical change does. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
A physical change is a change to a substance that does not result in the formation of a new substance.
What is formation ?Formation is the process of creating something new. It can refer to the creation of an organization, structure, or system. It is often used in business, when a company is established, or when a new product or service is created. It can also refer to the development of an idea or concept, such as a strategic plan or marketing campaign. Formation is an essential part of any entrepreneurial venture, and involves the development of a plan for a business, including the selection of personnel, market research, and the development of a financial structure. Formation is also used to refer to the development of a team or organization, and the process of creating and maintaining a cohesive and effective team of individuals.
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What property is dependent on the mass of the object?
A: temperature
B: phase
C: state
D: heat
Answer:
D Heat
Explanation:
Tell me if you need explain
ALLEN
How many water molecules are in a block of ice containing 2.00 mol
of water ( H2O)?
According to the question the answer is 1.204 x 10^24 molecules of water.
What is molecules?Molecules are the smallest particles of matter that can exist in a stable form. They are made of two or more atoms that are held together by chemical bonds. Molecules are the basis of all living things, and they are the building blocks of all matter. They come in a variety of shapes and sizes, and they can be composed of atoms of different elements. Molecules can be found in the air, in liquids, and in solids. They can be found in both organic and inorganic compounds, and they are essential components of life. Molecules play an important role in many chemical and biological processes, and they can be used to create new materials and products.
The number of water molecules in a block of ice containing 2.00 mol of water (H2O) can be calculated using the Avogadro's number, which is 6.02 x 10^23 molecules per mol. Therefore, the answer is 1.204 x 10^24 molecules of water.
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For the reaction below, how many moles of aluminum are produced from 14 moles of
lithium?
3Li (s) + AI(NO3)3 (aq) --> 3LINO3(aq) + Al(s)
Answer:
4.67 moles of aluminum
Explanation:
For the reaction:
3Li (s) + AI(NO3)3 (aq) --> 3LiNO3(aq) + Al(s)
The number of moles of aluminum produced from 14 moles of lithium can be determined by using the mole ratio between aluminum and lithium in the balanced chemical equation. The mole ratio between aluminum and lithium in the reaction is 1:3, which means that for every 3 moles of lithium, 1 mole of aluminum is produced. Therefore, the number of moles of aluminum produced from 14 moles of lithium can be calculated as follows:
14 moles of Li / 3 moles of Li per mole of Al = 4.67 moles of Al
So, 14 moles of lithium will produce 4.67 moles of aluminum.
Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
The balanced equation is : Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
AlBr₃ + 3Cl ---> AlCl₃ + 3Br
The Aluminum bromide and chlorine gas will react to form the aluminum chloride and the bromine gas
AlBr₃ + Cl ---> AlCl₃ + Br
reactant product
Al 1 1
Br 3 1
Cl 1 3
The chemical equation is said to be the balanced equation if the atoms of the reactants side is equals to the atoms of the product side. Multiplying the 3 in Cl and the 3 in the Br. The equation is as follows :
AlBr₃ + 3Cl ---> AlCl₃ + 3Br
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This question is incomplete, the complete question is :
Balance the chemical equation : Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
Calculate the quantity of O₂ would be required to generate 13.0 mol of NO₂ in the reaction below assuming the reaction has only 67.1% yield.
2 NO (g) + O₂ (g) → 2 NO₂ (g)
Solving the Question
We're given:
[tex]2 NO_{(g)} + O_{2(g)}\rightarrow 2 NO_{2 (g)}[/tex][tex]n_{NO_2}=13.0\hspace{4}mol[/tex][tex]\%\hspace{4}yield=67.1\%[/tex]First, let's calculate the theoretical yield of NO2.
⇒ [tex]\%\hspace{4}yield=\dfrac{actual\hspace{4}yield}{theoretical\hspace{4}yield}[/tex]
The yield of NO2 we must produce is 13.0 mol.
⇒ [tex]\%\hspace{4}yield=\dfrac{13.0}{theoretical\hspace{4}yield}[/tex]
We're also given that the percentage yield of this reaction is 67.1%.
⇒ [tex]0.671=\dfrac{13.0}{theoretical\hspace{4}yield}[/tex]
⇒ [tex]theoretical\hspace{4}yield=\dfrac{13.0}{0.671}\\\\theoretical\hspace{4}yield=19.3740685544\hspace{4}mol[/tex]
First, construct a mole ratio between O2 and NO2.
From the balanced chemical equation, we know that 1 mol of O2 can produce 2 mol of NO2:
⇒ [tex]\dfrac{n_{O_2}}{1}=\dfrac{n_{NO_2}}{2}[/tex]
We're given that we must theoretically produce 19.3740685544 mol of NO2:
⇒ [tex]\dfrac{n_{O_2}}{1}=\dfrac{19.3740685544}{2}[/tex]
⇒ [tex]n_{O_2}=9.6870342772\hspace{4}mol[/tex]
Round to significant figures (3):
⇒ [tex]n_{O_2}=9.69\hspace{4}mol[/tex]
Answer[tex]n_{O_2}=9.69\hspace{4}mol[/tex]
What is the importance of the pH scale in determining the acidity or basicity of a solution?
Answer:
because it provides a numerical value for the concentration of hydrogen ions in a solution.
Explanation:
Answer:
The pH scale is important in determining the acidity or basicity of a solution because it provides a numerical value for the concentration of hydrogen ions in a solution. The pH of a solution ranges from 0-14, with values below 7 being acidic, values above 7 being basic, and 7 being neutral.
Explanation:
C5H12(l)+8O2(g)→5CO2(g)+6H2O(g) express answers as intergers
The balanced equation for the reaction of pentane (C5H12) with oxygen gas (O2) to produce carbon dioxide (CO2) and water (H2O) is: C5H12(l) + 8O2(g) → 5CO2(g) + 6H2O(g).
What is reaction?Reaction is the process of responding to a stimulus or situation. It can be physical, emotional, mental, or social. Reactions can vary depending on the individual and the context, and they can be positive or negative. Examples of reactions include feeling anger, joy, sadness, or fear when faced with a situation.
The ratio of reactants to products in this reaction is 1:5:6:8. This means that for every 1 molecule of pentane (C5H12), 5 molecules of carbon dioxide (CO2), 6 molecules of water (H2O), and 8 molecules of oxygen gas (O2) are required. Therefore, the answer to the question is 8, as 8 molecules of oxygen gas (O2) are needed to react with 1 molecule of pentane (C5H12).
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The sun provides _____ to a plant, when a person eats the plant, ____ is released and then transforms into___ when the person goes for a run
Answer: no answer
Explanation:
The Haber Process involves nitrogen gas combining with hydrogen gas to produce
ammonia.
N. + 3H2 - 2NH,
10.0 grams of nitrogen gas is reacted with 10.0 grams of hydrogen gas.
Find the following: the molar mass of reactants and products, the limiting reactant.
the excess reactant, the amount of ammonia produced.
17.04 grams
12.16 grams
hydrogen gas
28.02 grams
nitrogen gas
1. The limiting reactant
2. The excess reactant
3. Molar mass of hydrogen gas
4. Molar mass of nitrogen gas
5. Molar mass of ammonia (NHb)
6. Amount of ammonia produced
2.02 grams
The limiting reactant: Nitrogen gas (N2)
The excess reactant: Hydrogen gas (H₂)
Molar mass of hydrogen gas: 2.016 grams/mol
Molar mass of nitrogen gas: 28.02 grams/mol
Molar mass of ammonia (NH3): 17.04 grams/mol
What is Haber process ?The Haber process is a high-temperature, pressurized ammonia-gas synthesis. According to the balanced reaction, three moles of hydrogen and one mole of nitrogen gas yield two moles of ammonia gas.
Molecular mass of H₂ is 2 g/mol
molecular mass of N₂ is 28 g/mol
No.of moles in 10 g of H₂ is 10/2
= 5 moles.
no.of moles in 10 g of N₂ is 10/28
= 0.35 moles.
Here, the nitrogen gas is fewer in amount, and it is the limiting reactant in the reaction and hydrogen is the excess reactant.
Molar mass of NH₃ = 17 g/mol
1 mole or 28 g of nitrogen gives 2 moles or 34 g of ammonia. Hence, 10 g of nitrogen gas will give,
(10 × 34) / 28
= 12.14 g of NH₃.
Thus, 12.14 g of NH₃ is produced by 10 g of nitrogen gas in this reaction.
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Which answer choice best describes the law of conservation of energy?
A. Energy can be created but not destroyed.
B. Energy can be both created and destroyed.
C. Energy cannot be created nor destroyed it just changes form.
D. Energy cannot be created, but it can be destroyed.
Which coefficients correctly balance the equation below
Ba3N2+HOH - -> Ba(OH)2+NH3
1,6,1,2
1,3,3,2
1,6,3,2
2,6,3,2
The coefficients that correctly balance the given equation is 1. 6, 3,2
The correct option is C
What is a balanced equation of a reaction?A balanced equation of a reaction is an equation in which the moles of atoms of elements of the reactants are equal to the moles of atoms of the product.
According to the law of conservation of matter, matter is neither created nor destroyed, hence, the mass of the reactants must be equal to the mass of products at the end of any given chemical reaction.
The balanced equation of the given reaction is as follows:
Ba₃N₂+ 6 HOH - -> 3 Ba(OH)₂ + 2 NH₃
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Each of the following are either a weak acid or a weak base that will partially ionize to form 2 ions. Complete the ionization equation for each.
HCN + H2O ⇌
HF + H2O ⇌
NH4OH + H2O ⇌
C5H5N + H2O ⇌
A weak acid or a weak base is a substance that partially ionizes to form two ions in aqueous solution.
What exactly do you mean by aqueous solution?
An aqueous solution is basically a solution in which the solvent is water. Aqueous solutions can contain salts, acids, bases and other compounds. These solutions are often used in chemistry, biology and medicine for a variety of purposes.
HCN + H2O ⇌ H+ + CN- (weak acid)
HF + H2O ⇌ H+ + F- (weak acid)
NH4OH + H2O ⇌ NH4+ + OH- (weak base)
C5H5N + H2O ⇌ H+ + C5H5N- (weak acid)
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Question 11 of 20:
Select the best answer for the question.
11. A gray dog pulled a sled with a mass of 25 kilograms 100 meters. A brown dog
pulled a sled with the same mass across the same distance, but in half the time.
Which statement compares the two correctly?
O A. Both dogs used the same amount of work, and the brown dog used less power.
O B. Both dogs did the same amount of work, and the brown dog used more power.
O C. The brown dog did more work and used less power.
O D. The brown dog did less work, and both dogs used the same amount of power.
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Both dogs used the same amount of work, and the brown dog used less power.
What is the difference between work and power?Work and power are both concepts in physics that are related to the transfer of energy, but they are not the same thing. Work refers to the amount of energy transferred to or from an object as a result of a force acting on it over a certain distance, whereas power refers to the rate at which work is done.
In other words, work is a measure of the total energy transferred, while power is a measure of how quickly that energy is transferred. Mathematically, work is defined as the product of the force applied to an object and the distance over which that force is applied, while power is defined as the rate of doing work, or the amount of work done per unit time.
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Which of the following is
the correct way to express
0.0000321 in scientific
notation?
A. 3.21 x 105
B. 32.1 x 106
C. 3.21 x 10-5
D. 32.1 x 10-6
Colorimetric Analysis of Asprin Chem Lab:
Students prepared a solution by hydrolyzing 0.3219 g of a crushed aspirin tablet in NaOH and then diluting with DI water in a 100-mL volumetric flask. Next, they transferred 1.50 mL of the solution to a 50-mL volumetric flask and diluted to the mark with FeCl3-KCl-HCl solution. The absorbance of the dilution was 0.346. Using their standard curve, they determined the concentration to be 5.02 × 10e-4 mol/L. If an aspirin tablet weighs 0.4267 g, determine the mass of ASA (in mg) per tablet.
*Note the answer is 400 mg and the Molarity of the standard solution is unknown.
-To account for not using the whole crushed tablet multiply by the ratio of m(tablet)/m(tablet used).
-I'm not sure which step in the calculations to apply this ratio.
-Any help would be greatly appreciated!
The mass of ASA - Acetylsalicylic acid per tablet is 214.9 mg. The number of moles present in the tablet, is 0.001190.
For this experiment it is important to find the number of moles of ASA present in the solution. By doing this we will get the amount of ASA in the tablet also.
Students prepared a solution by hydrolyzing 0.3219 g of a crushed aspirin tablet in NaOH and then diluting with DI water in a 100-mL volumetric flask.
Number of moles = mass of ASA / molar mass of ASA
The molar mass of ASA = 180.16 g/mol
Therefore, Number of moles = 0.3219 g / 180.16 g/mol
= 0.001785 mol.
Now finding the number of moles present in the tablet,
Moles in tablet = (moles of ASA from solution) x (mass of tablet / mass of solution)
= 0.001785 mol x (0.4267 g / 0.3219 g x 1.50 mL / 50 mL)
= 0.001190 mol
Now finding the mass of ASA,
Mass of ASA per tablet = (moles of ASA in tablet) x (molar mass of ASA)
= 0.001190 mol x 180.16 g/mol
= 0.2149 g or 214.9 mg
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Using tabulated ∆° values in the text, determine the enthalpy change (in kJ) that occurs during the formation of water from its elements.
32 ()+2 ()→22(l) ∆=?
The enthalpy of formation of H₂ and O₂ are zero. Then , the enthalpy of formation of water is 285 kJ.
What is enthalpy of formation ?Enthalpy change of a chemical reaction of physical change is the change in heat energy absorbed or evolved during the change or reaction. It is represented as ΔHf⁰.
The enthalpy of formation of elements in molecular state is zero. Hence the enthalpy of formation of H₂ and O₂ are zero.
The enthalpy of formation of water = -285 kJ.
enthalpy of reaction = enthalpy of products - enthalpy of reactants.
ΔHr = -285 kJ - 0+0 = - 285 kJ.
Therefore, the enthalpy change during the formation of water from its elements is - 285 kJ.
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Your complete question is as follows:
Using tabulated ∆Hf° values in the text, determine the enthalpy change (in kJ) that occurs during the formation of water from its elements:
2 H2 (g) + O2 (g) → 2 H2O (l) ∆H = ?
The percent by mass of cobalt(II) in COSO3 is _____%.
please help.
The percentage by mass of cobalt in cobalt sulfate is 42.39%.
How to calculate percent by mass?The mass percentage of a solution equals the mass of an element in one mole of the compound divided by the molar mass of the compound, multiplied by 100.
Percent by mass = (atomic mass of element/atomic mass of compound) × 100
According to this question, cobalt sulfate is given in this question. The atomic mass of cobalt is 58.93g/mol while the atomic mass of cobalt sulfate is 138.996g/mol.
% by mass = (58.93 ÷ 138.996) × 100
% by mass = 42.39%
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True or false if an employee asked to use a powered air, purifying respirator in place of a negative pressure respirator the employer must provide the PARP to the employee
True. If an employee requests to use a Powered Air-Purifying Respirator (PAPR) in place of a negative pressure respirator.
define Powered Air-Purifying Respirator ?
A Powered Air-Purifying Respirator (PAPR) is a type of respirator that uses a motor to draw air through a filter to clean it before delivering it to the wearer's breathing zone. PAPRs are designed to protect the wearer from inhaling harmful substances, such as dust, smoke, fumes, and particulate matter.
True. If an employee requests to use a Powered Air-Purifying Respirator (PAPR) in place of a negative pressure respirator, the employer must provide the PAPR to the employee if it provides the same or greater level of protection as the negative pressure respirator. This is because the employer has a legal responsibility to provide a safe and healthy work environment for employees, and to ensure that employees are protected from workplace hazards to the extent feasible. Providing a PAPR may be necessary to achieve this goal, depending on the specific circumstances of the workplace and the hazards present.
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