What happens when you touch two hot bowls made of different materials? The wooden and metal bowl are both at the same temperature and HOTTER than your finger. Compare the direction and speed of the heat arrows for the wooden and metal bowl. Explain WHY and what affects HOW the arrows move from the wooden and metal bowl to the finger.
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Answer:
Explanation:
Both metal and wooden bowls are at the same temperature . But wood is non-conductor of heat whereas metal is conductor of heat .
If we touch the wooden bowl , heat flows from hot to cold object . Since the finger is at higher temperature , heat flows from finger to wooden bowl . But , since wood is non conducting , it does not allow heat to be conducted through it . Hence very less heat will be conducted from our finger .
On the other hand , if we touch a metal bowl , heat flows from finger to the metal bowl , without any hinderance . Hence rate of heat flow will be fast in case of metal bowl . As a result of it , we feel cool in touching metal bowl . This feeling will be absent in case of wooden bowl.
Related Questions
When energy changes from one form to another, some energy is always changed to
ОА.
sound.
ОВ.
heat.
Ос.
light.
OD
electricity
Answers
Answer:
OB heat
Explanation:
Hope this helps
On a mountain in the spring, snow melts and flows into a creek. Then the creek flows into a river, which eventually flows into the ocean.
1. Which part of the water cycle is this an example?
2. What forces cases the water to flow drown hill?
Answers
Answer:
I'm sorry but I need points
Select the single best answer. Identify the chemical equation that shows the release of one hydrogen ion from a molecule of the following acid. H2SO3(aq), sulfurous acid Multiple Choice H2SO3(aq)→H+(aqh)+HSO3−(aq) H2SO3(aq)→H+(aq)+SO32(aq) H2SO3(aq)→2H+(aq)+SO32−(aq)
Answers
The chemical equation that shows the release of one hydrogen ion from a molecule of the acid H2SO3(aq) is H2SO3(aq)→H+(aq)+HSO3−(aq).Explanation: The equation given represents the release of a single hydrogen ion from H2SO3(aq) that converts into H+(aq) and HSO3−(aq) ions.
The acid sulfurous acid is represented by the chemical formula H2SO3 which is also an aqueous solution. It dissociates in water to release hydrogen ion and bisulfite ion. The hydrogen ion is H+ and is represented in the equation given.The three chemical equations for the release of hydrogen ions from sulfurous acid can be written as:H2SO3(aq)→H+(aq) + HSO3-(aq)H2SO3(aq)→H+(aq) + SO32-(aq)H2SO3(aq)→2H+(aq) + SO32-(aq)However, out of these three equations, the chemical equation that shows the release of one hydrogen ion from a molecule of the acid H2SO3(aq) is H2SO3(aq)→H+(aq)+HSO3−(aq).
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If energy absorbed is greater than energy emitted does temperature increase or decrease?
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Answer:
the decrease is the answer to the question
The model of the atom changed as new evidence was discovered. The plum pudding model suggested that the atom was a ball of positive charge with electrons embedded in it. Evidence from the alpha particle scattering experiment led to a change in the model of the atom from the plum pudding model. Explain how. PLS HELP RN :)
Answers
Answer:
so since the model atom was changed as new evidence, and the plum pudding model was a ball of positive charge, the alpha particle scattering which broke up the atom
select an efficient synthesis of isopropyl azide from isopropyl alcohol. be sure to answer all parts.
Answers
To synthesize isopropyl azide from isopropyl alcohol, you first convert the alcohol to isopropyl chloride using a chlorinating agent. Then, you perform a nucleophilic substitution reaction with sodium azide to obtain the final product, isopropyl azide.
To synthesize isopropyl azide from isopropyl alcohol, you can follow these steps:
Step:1. Start with isopropyl alcohol (C3H8O), which will serve as your starting material.
Step:2. Convert isopropyl alcohol to isopropyl chloride (C3H7Cl) through a substitution reaction. You can achieve this by treating isopropyl alcohol with a suitable chlorinating agent, such as thionyl chloride (SOCl2) or phosphorus trichloride (PCl3). The reaction will produce isopropyl chloride and the corresponding acid.
Step:3. Prepare sodium azide (NaN3), which is necessary for the nucleophilic substitution reaction. Sodium azide can be obtained through the reaction of sodium nitrite (NaNO2) and hydrochloric acid (HCl) followed by treatment with sodium amide (NaNH2).
Step:4. Perform a nucleophilic substitution reaction between isopropyl chloride and sodium azide. This reaction will replace the chlorine atom in isopropyl chloride with an azide group (N3) to form isopropyl azide (C3H7N3). The byproduct of this reaction is sodium chloride (NaCl).
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Above which temperature does the thermal conductivity of water start to fall?
Answers
Answer:
It’s actually 130 degrees Celsius.
Explanation:
Ella is interested in combining substances to form a new material.
She read about some of the products chemists have discovered. She learned that sometimes synthetic materials are created accidentally. For instance, a chemist working on plastic gun sights synthesized a very sticky material accidentally. Which product had he accidentally made?
A. a coil spring toy
B. a heavy-duty adhesive glue
C. a new sweetener
D. a non-stick surface
please hurry
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can there be 4 electrons in the first energy level
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when 0.224 g of sodium metal is added to an excess of hydrochloric acid, 2330 j of heat are produced. what is the enthalpy of the reaction as written? 2na(s) 2hcl(aq)⟶2nacl(aq) h2(g)
Answers
The enthalpy of the reaction as written is approximately 239,306 J/mol.
To calculate the enthalpy of the reaction, we need to use the heat released (2330 J) and the amount of sodium reacted (0.224 g) to determine the heat released per mole of sodium reacted.
The molar mass of sodium (Na) is 22.99 g/mol.
First, we need to calculate the number of moles of sodium reacted:
Number of moles of Na = Mass of Na / Molar mass of Na
Number of moles of Na = 0.224 g / 22.99 g/mol ≈ 0.00974 mol
Next, we can calculate the enthalpy change (ΔH) per mole of sodium reacted:
ΔH = Heat released / Number of moles of Na
ΔH = 2330 J / 0.00974 mol ≈ 239306 J/mol
Enthalpy (H) is a thermodynamic property that represents the total heat content of a system at constant pressure. It includes the internal energy of the system plus the product of pressure and volume. Enthalpy is often used to describe heat changes in chemical reactions, where the difference in enthalpy between the reactants and products determines whether a reaction is exothermic (releases heat) or endothermic (absorbs heat). Enthalpy is typically measured in joules (J) or kilojoules (kJ).
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Can someone plz help me :<
Answers
Answer: cats r alliens because they r kind of like ufos they would usually wonder around rather u know it or not when they spy on us it could b with us sleep cooking anything so they r like aliens
Explanation:
the simplest form of matter that has a unique set of properties is called a
Answers
Answer:
an element
answer is an element
hope it helps
pls mark me as brainlliest
box a has a mass of 45.0kg and box b has a mass of 60.0kg. what is the tension on box a if the acceleration of the system is 1.40m/s2 clockwise? 378n 504n 1180n 882n
Answers
The tension acting on the box is 504 N.
Mass of the box A, m₁ = 45 kg
Mass of the box B, m₂ = 60 kg
Acceleration of the system, a = 1.4 m/s²
From, the figure, the forces acting on the blocks can be written as,
m₂g - T = m₂a ------eqn 1
T - m₁g = m₁a ------eqn 2
The magnitude of tension can be calculated by solving any of these equations. So, considering the first equation,
m₂g - T = m₂a
Therefore, the tension acting on the box,
T = m₂g -m₂a
T = m₂(g - a)
Applying the values of m₂, g and a,
T = 60 x (9.8 - 1.4)
T = 60 x 8.4
T = 504 N
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If pesticides must be stored on the premises, which location is the best choice?Gnaw marks on wood, metal, or concreteIn a closet with cleaning chemicalsSome chemicals are not approved for use in foodservice operations.
Answers
The best choice for storing pesticides on the premises would be a location that is secure and separate from other chemicals or materials.
Pesticides are potentially hazardous chemicals that can cause harm to humans and animals if they are not handled properly. Therefore, it is important to store them in a secure location that is inaccessible to unauthorized personnel.
Gnaw marks on wood, metal, or concrete could indicate the presence of pests, which could lead to contamination of the pesticides. A closet with cleaning chemicals may not be the best choice, as mixing cleaning chemicals with pesticides could create a dangerous reaction.
Additionally, some chemicals are not approved for use in foodservice operations, so it would not be appropriate to store them in areas where food is prepared or stored. The best choice for storing pesticides would be a designated area that is secure, well-ventilated, and away from other chemicals or materials that could potentially cause a reaction or contamination.
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The element magnesium is a
O Group 12, Transition Metal
O Period 3, Alkaline Earth Metal
Period 4. Alkali Metal
O Period 4, Halogen
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Period 3
Alkaline Earth Metal
How many grams of carbon dioxide would 6.0E25 molecules be?
Answers
Answer:
4383.28 g
Explanation:
First we'll need to convert molecules into moles, we can do so using Avogadro's number:
6.0x10²⁵ molecules ÷ 6.023x10²³ molecules/mol = 99.62 molesThen we will convert 99.62 moles of carbon dioxide (CO₂) into grams, using its molar mass:
99.62 moles CO₂ * 44 g/mol = 4383.28 gWhich has more atoms: one mole of helium or one mole of lead?
Answers
Answer:
They're equal.
Explanation:
Giving an idea let's use the question:
How big would a box be that holds one mole of helium?This would depend on the temperature and pressure conditions that the helium gas is being stored under.
You see, gases have no fixed volume. They will expand when the temperature increases and/or the applied pressure decreases. On the other hand, the gas will contract when cooled or pressure is applied. So one mole of helium could occupy almost any volume, depending on how much you compress it or how cool you keep it.
However, if your helium gas is stored under standard temperature and pressure conditions (STP)(0 C and 101.3 kPa), then it would fill a box with a volume of 22.4 L. This volume is known as the standard molar volume and is the same for any gas at STP.
I will let you come up with a set of dimensions for a box that could satisfy this volume.
An atom of zinc that contains 30 protons and 38 neutrons would be named what
Answers
Answer:
Explanation:
30+38
so this is the isosotope of Zn that weighs 68
-so Zn68
]
Consider the following intermediate chemical equations.
C(s) +
CO(g) +
O₂(g) → CO(g)
How will oxygen appear in the final chemical equation?
O O2(g) as a product
O O2(g) as a reactant
OO(g) as a product
O 20(g) as a reactant
O₂(g) → CO₂(g)
Answers
In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).
What is a chemical equation?A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
According to this question, an intermediate chemical equation is presented as follows:
CO(g) + O₂(g) → CO(g)C(s) + O₂(g) → CO₂(g)As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.
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A gas has an initial pressure of 120 kPa, a volume of 23 liters, and a temperature of 20°C. If the pressure is raised to 150 kPa the new volume is 17 liters, what is the new temperature of the gas? 0 0.003 K 0 270.7 K O 18.4K O 100 K
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Answer:
virgil Cassidy n.v
Christian doctorbbn nnn
Explanation:
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How can you find the number of protons from the nuclide symbol?
It is the difference in the mass number and atomic number.
It is half the number in the upper left (half the mass number).
It is the number in the lower left (atomic number).
It is the number in the upper left (atomic number).
It is the number in the upper left (mass number).
Answers
Answer: It is the number in the upper left (atomic number).
Explanation: The atomic number is normally the number of protons. I hope this helps.
Zuri finds that sample A and B are shiny and can be hammered. Sample A is hard. Sample C and D are dull. Sample C is a liquid and sample D is brittle. Choose the correct option from the following Group of answer choices Samples A and B are metals, and samples C and D are nonmetals. Samples A, B, C, and D are all metals. Samples A, B, C, and D are all nonmetals. Samples A and B are nonmetals, and samples C and D are metals.
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Samples A and B are metals, and samples C and D are nonmetals.
What is the nature of the materials?We have to note that the appearance of the object can be used to determine the kind of object that it is. We know that a metal would always have a luster and the exception here is only mercury that is a liquid metal.
On the other hand, the non metals are either liquid or they are solids that are brittle and would have a low melting and boiling point due to the lack of a crystalline structure.
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A 17 g ice cube at −27
∘
C is placed in a lake whose temperature is 61
∘
C. Calculate the change in entropy of the cube-lake system as the ice cube comes to thermal equilibrium with the lake. The specific heat of ice is 2220 J/kg⋅K. (Hint: Will the ice cube affect the temperature of the lake?) Number Units
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A 17 g ice cube at −27 °C is placed in a lake whose temperature is 61 °C. The change in entropy of the cube-lake system as the ice cube comes to thermal equilibrium with the lake is 34.392 J/K. The specific heat of ice is 2220 J/kg K.
To calculate the change in entropy of the cube-lake system as the ice cube comes to thermal equilibrium with the lake, we can use the formula:
ΔS = mcΔT
where ΔS is the change in entropy, m is the mass of the ice cube, c is the specific heat of ice, and ΔT is the change in temperature.
Mass of the ice cube (m) = 17 g = 0.017 kg
Specific heat of ice (c) = 2220 J/kg K
Initial temperature of the ice cube (T₁) = -27 °C = -27 K
Final temperature of the system (T₂) = 61 °C = 61 K
To calculate the change in temperature (ΔT) of the ice cube:
ΔT = T₂ - T₁
ΔT = 61 K - (-27 K)
ΔT = 88 K
Now, we can calculate the change in entropy (ΔS) using the given mass and specific heat of ice:
ΔS = mcΔT
ΔS = (0.017 kg) * (2220 J/kg K) * (88 K)
Calculating ΔS, we find:
ΔS = 34.392 J/K
Therefore, the change in entropy of the cube lake system as the ice cube comes to thermal equilibrium with the lake is approximately 34.392 J/K.
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For the following question, choose TWO answers. Which question should be asked to determine if the reaction supports the Brønsted- Lowry model of acids and bases?
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According to the Brønsted-Lowry model, an acid and its conjugate base differ by a single proton, while a base and its conjugate acid differ by the addition of a single proton. If a reaction produces conjugate acid-base pairs, it supports this model.
To determine if the reaction supports the Brønsted-Lowry model of acids and bases, there are several questions that could be asked. Two possible questions are:
1. Does the reaction involve the transfer of protons (H+ ions) from one molecule to another.This is a key concept in the Brønsted-Lowry model, which defines acids as proton donors and bases as proton acceptors. If a reaction involves the transfer of protons, it supports this model.
2. Do the reactants and products contain conjugate acid-base pairs.
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Answer:
1. Did an acid donate a hydrogen ion to become a conjugate base?
2. Did a base accept a hydrogen ion to become a conjugate acid?
Water is a universal solvent because it can be a solid, liquid, or a gas True or false
Answers
5 || m. Find the measure of <1.
al
4
5/55
7
3
6
6
Answers
Answer:
answer is 125
Explanation:
180-55= 125
How are gases and liquids different from each other
Answers
Answer:
Gases, liquids, and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. Gas is well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
Can someone help please?
Copper occurs naturally as a mix of two isotopes: Copper-63 with a mass of 62.930 amu and copper-65 with a mass of 64.928 amu. The percent abundance of copper-63 is 69.09%.
Calculate the atomic mass of copper.
Answers
Answer: 63.55
Explanation:
The attached chart shows the calculation. The orange line points to the % abundance of Cu-65, which is the difference of 100% less the % Abundance of Cu-65 (since there are only 2 isotopes).
The weighted average contribution of each istope is calculated (blue arrow) and then summed to find the atomic mass of copper.
The irreversible gas phase reaction of ethylene (A) with hydrogen (B) to produce ethane (C) is carried out in a Ni-catalyzed packed-bed reactor: A + B =C , the rate constant for this reaction at 400°K is K= 0.2 L2 /mol s Kg cat, If the feed stream contains an equimolar amount of A and B and enters a temperature of 400°K and a pressure of 5 atm with a total volumetric flow rate of 8 L/s, what is the mass of catalyst required for a 70% conversion, considers it to be
Answers
Main answer:In order to find the mass of catalyst required for a 70% conversion, the following explanation can be followed:Explanation:Given the irreversible gas phase reaction of ethylene (A) with hydrogen (B) to produce ethane (C) is carried out in a Ni-catalyzed packed-bed reactor: A + B =CThe rate constant for this reaction at 400°K is K= 0.2 L2 /mol s Kg catThe feed stream contains an equimolar amount of A and B and enters a temperature of 400°K and a pressure of 5 atm with a total volumetric flow rate of 8 L/sTo find the mass of catalyst required for a 70% conversion, the following equation can be used:Plug the given values in the equation:To convert L/s into mol/s, the following formula can be used:Total volumetric flow rate (Q) = 8 L/sThe molar volume of the reactants can be calculated as follows:Therefore, the number of moles entering the reactor per second:To find the number of moles of A converted to C per second, the conversion can be used as follows:Therefore, the number of moles of A that will react per second:The mass of the catalyst that will be required can be calculated as follows:Therefore, the mass of catalyst required for a 70% conversion is 9.64 Kg.
Approximately 0.36 kg of catalyst is required for a 70% conversion in the given Ni-catalyzed packed-bed reactor, assuming a surface area of 10 m².
Given:
Rate constant (k) = 0.2 L²/mol s Kg cat
Total volumetric flow rate (Q) = 8 L/s
Conversion (X) = 70%
To calculate the mass of catalyst required, we need the surface area of the catalyst. Since the surface area (S) is not provided, let's assume a value of 10 m² for demonstration purposes.
Substituting the values into the equation:
Catalyst mass = (k * 0.3² * Fa₀ * Fb₀) / (Rate constant * Surface area of catalyst)
Catalyst mass = (0.2 L²/mol s Kg cat * (0.3)² * 4 L/s * 4 L/s) / (0.2 L²/mol s Kg cat * 10 m²)
Catalyst mass = (0.2 * 0.09 * 4 * 4) / (0.2 * 10)
Catalyst mass = 0.72 / 2
Catalyst mass = 0.36 kg
Therefore, approximately 0.36 kg of catalyst is required for a 70% conversion in the given Ni-catalyzed packed-bed reactor, assuming a surface area of 10 m².
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which of the interactions makes the largest contribution to the stability of a folded protein?
Answers
About equal amounts are contributed by each encounter. The hydrophobic effect, or the of unsaturated R groups inside the protein core and away from the solvent water, is a crucial factor in protein stability.
Explain what water is.Water is a material that exists in gaseous, liquid, and solid phases and is made up of the essential elements hydrogen and oxygen. One of the prevalent and necessary substances is it. It is a colorless, odorless liquid at room temperatures with the crucial property of dissolving several other compounds.
What makes water wet?Due to its low viscosity, which is caused by the relatively weak connections between its molecules, water is moist in the sense that it flows readily.
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