Answer:
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process (see the 1ˢᵗ law of thermodynamics).
Explanation:
Explanation:
Thermal Energy refers to the energy within a system that is responsible for it temperature etc.
During the process of evaporation, molecules of liquid water in oceans,
lakes, and other bodies of water are heated by what energy source? *
Answer:
Explanation:
solar energy
Heat from the sun, or solar energy, powers the evaporation process. It soaks up moisture from soil in a garden, as well as the biggest oceans and lakes. The water level will decrease as it is exposed to the heat of the sun.
A 36-kg girl walks to the top of stairs that are 2.0-m high. How much gravitational potential energy does the girl gain
A mole represents a macroscopic quantity of matter that can be used in the laboratory.
a. True
b. False
Answer:
A. True
Explanation:
Mole is the unit associated with measuring substances in chemistry. Chemicals are usually measured in moles and it is derived from the formula - mass/molar mass.
This makes the mole a definition of the representation of a macroscopic quantity of matter that can be used in the laboratory and hereby validates the answer as being true .
Element X is more reactive than lithium and magnesium but less reactive than potassium. Which element is most likely to be X?
Na
Rb
Ca
BA
Answer:
It is Likely to Be Sodium (Na) coz as You Down The group the reactivity increase
What happens when carbon dioxide at 74°C is placed in thermal contact with water at 14°C?
Answer:
What happens when carbon dioxide at 74°C is placed in thermal contact with water at 14°C? Energy leaves the carbon dioxide and enters the water. The water gets hotter than the carbon dioxide. The temperatures of the two substances equalize. Both the water and the carbon dioxide decrease in temperature. The water stays colder than the carbon dioxide.
Explanation:
The temperatures of the two substances equalize when carbon dioxide at 74°C is placed in thermal contact with water at 14°C.
What is thermal contact?A state in which two or more systems can exchange thermal energy.
As two objects at different temperatures are placed in contact, heat is transferred from the warmer to the cooler object until the temperature of the two objects is the same.
The amount of heat that is transferred from the warmer object is equal to the amount of heat that is transferred into the cooler object.
This is in agreement with the law of conservation of energy.
Hence, the temperatures of the two substances equalize.
Learn more about thermal contact here:
https://brainly.com/question/1601493
#SPJ2
Read the Safety Data Sheet of hydrogen peroxide to identify the recommended way to store this substance. Choose one:_______.
a. In an open container in a bright and humid environment
b. In a glass, leak-proof bottle on a shelf or cabinet
c. In a tightly closed container in a dry and well-ventilated place
d. In a well-ventilated container in a closed, dry area
Answer:
The correct option is C.
In a tightly closed container in a dry and well-ventilated place
Explanation:
Hydrogen peroxide should be store in a tight closed container and ventilated area because it is an oxidizing agent and it's has oxidizing characteristics. If to is exposed or the bottle lid is broken and exposed it can react and liberate oxygen and heat. It can react with the air and chemical it is exposed with. This will make it to be less effective and there will be a change in it's composition.
The weight loss of an aluminum alloy corroding in a solution of hydrochloric acid was observed to be 0.250 g/cm2 after an 8 h immersion period [13]. What is the corresponding anodic current density in milliamperes per square centimeter, assuming that all the corrosion is due to the following anodic half-cell reaction:
This question is incomplete, the complete question is;
The weight loss of an aluminum alloy corroding in a solution of hydrochloric acid was observed to be 0.250 g/cm² after an 8 h immersion period [13]. What is the corresponding anodic current density in milliamperes per square centimeter, assuming that all the corrosion is due to the following anodic half-cell reaction:
Al → Al³⁺ + 3e⁻
The atomic weight is 58.7 g/mol
Answer:
Current density in milliamperes per square centimeter is 45.81 mA/cm²
Explanation:
Given the data in the question;
we know that Faradays law of electrolysis states that;
amount of substance produced at each electrode is directly proportional to the quantity of charge flowing through the cell.
so
m = ( Q/F) (M/z)
where m is the mass of substance liberated at an electrode( 0.250 g/cm²)
Q is the total electric charge passed through the substance
F is Faradays constant (96,500 C/mol)
M is the molar mass of the substance( 58.7 g/mol ) and Z is the number of electrons transferred(3)
Also
we know that; Q = It
where I is current and t is time( 8hrs × 60 × 60 = 28800 sec )
we substitute Q = It into our equation'
we have;
m = ( It/F) (M/z)
m = ItM / Fz
mFz = ItM
I = mFz / tM
so we substitute
I = [0.250 g/cm² × 96,500 C/mol × 3] / [ 28800 × 58.7 g/mol]
I = 72375 / 1690560
I = 0.04581 A/cm²
we know that; 1 ampere = 1000 milliampere
so
I = 0.04581 × 1000
I = 45.81 mA/cm²
Therefore, current density in milliamperes per square centimeter is 45.81 mA/cm²
How many moles in 4.93 x 10E23 atoms of silver?
0.819 mol Ag
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
4.93 × 10²³ atoms Ag
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 4.93 \cdot 10^{23} \ atoms \ Ag(\frac{1 \ mol \ Ag}{6.022 \cdot 10^{23} \ atoms \ Ag})[/tex]Divide: [tex]\displaystyle 0.818665 \ mol \ Ag[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.818665 mol Ag ≈ 0.819 mol Ag
What are redox half-reactions?
A. Equations that separate the oxidation and reduction parts of the reaction
B. Equations that separate the reactants from the products in a redox reaction
C. Equations that separate the electron transfer part from the atomic part
D. Equations that show the oxidation potentials and the reduction potentials
(Answer is A)
Answer:
A
Explanation:
4) Which of the following represent a valid hypothesis ?
A) Sodium metal reacts violently with water.
B) Oxygen is a gas at room temperature.
C) Lead is soft and malleable.
D) Neon does not react with oxygen.
E) Metals tend to lose electrons.
Answer:a
Explanation:
It can be tested and have a control, etc.
A hypothesis is a statement which can be confirmed experimentally. The correct answer is option A: Sodium metal reacts violently with water.
A hypothesis is a statement that can be confirmed by testing it. In other words, a hypothesis must be subjected to an experiment in order to ascertain whether it is true or false.
The only statement that can easily be confirmed experimentally in the laboratory is "Sodium metal reacts violently with water." Hence, this statement represents a valid hypothesis.
Learn more: https://brainly.com/question/17216882
PLEASE HELPPP!!!!!!!
Scientists observe patterns in matter. They organize matter into groups based on shared physical and chemical properties. Which statement describes a chemical property that many elements might share?
A. bonds easily with oxygen in the air
B. boils between 90°C and 100°C
C. shines when polished
D. floats in water
Answer:
a
Explanation:
bonding is chemical
A chemicals change includes bond making or breaking. The reaction between two atoms or molecules is their chemical property. Thus bonding with oxygen in air is a common chemical property of elements.
What is chemical change?A change in which a substance undergo chemical bond making or breaking and forming new products. Whereas, a physical change does not involve these bond breaking or formation instead a phase change occurs there. Such as conversion of solids to liquids.
All the elements in the periodic table have their characteristic chemical and physical properties. Metallic shining is a physical property of metallic elements and floats in water describes the density of that element which is a physical property.
Similarly, boiling and melting are physical properties and they do not include any bond formation or breaking of the element.
The reaction with oxygen in air called oxidation forming their oxidised product is a chemical change. Thus, option A is correct.
To find more about oxidation, refer the link below:
https://brainly.com/question/376562
#SPJ2
Choose the correct mechanistic pathway for each of the following questions:
A. an El process
B. an SN2 process
C. an E2 process
D. an SN1 process
a. Chlorination of a 1° alcohol using Thionyl Chloride
b. Alkene formation via POCl3 reaction with a 2º alcohol
Answer:
Chlorination of a 1° alcohol using Thionyl Chloride - an SN2 process
Alkene formation via POCl3 reaction with a 2º alcohol - an El process
Explanation:
For a primary alcohol, the chlorination occurs by SN2 mechanism. Remember that the order of SN2 mechanism is methyl > primary > secondary > tertiary. This means that a primary alkyl halide will undergo nucleophillic substitution by SN2 mechanism.
For a secondary alkyl halide, we normally expect that the mechanism will be E2. When we use POCl3 and pyridine, the alkyl halide passes through a carbocation intermediate which is characteristic of an E1 mechanism.
10 points
How many more oxygen atoms are in 3Mg3(PO4)2 than in 4Al2O3?
Answer:
12 more oxygen
Explanation:
An atom is the smallest particles that can take part in a chemical reaction
The given compounds are:
3Mg₃(PO₄)₂
Number of oxygen atoms = 3[2 x 4] = 24 oxygen atoms
For;
4Al₂O₃;
Number of oxygen atoms = 4 x 3 = 12 oxygen atoms
In 3Mg₃(PO₄)₂ , there are 24 - 12 = 12 more oxygen atoms than in 4Al₂O₃;
Answer:was it 9
Explanation:
I have the same question
What is a concussion, and how is it related to force?
Answer:
A head injury expert says that most concussions deliver 95 g's to the human body upon impact. G-force is a unit of force equal to the force exerted by gravity. In addition, the average football player receives 103 g's when hit during a game.
Explanation:
A cylinder has a piston at one end that can be moved in or out to change the volume of gas inside. The other end is fitted with a valve. Initially the cylinder contains 2.95 mol of an ideal gas. The piston is now pushed in to decrease the volume of gas to one-third its initial value without causing any change in temperature. In order to keep the pressure constant as well, how many moles of gas need to be released through the valve
Answer:
0.974 moles
Explanation:
Avogadro's law states that the volume of a given mass of gas is directly proportional to the number of moles present as long as the temperature and pressure are held constant.
Now from the question;
V1 = V
n1 = 2.95
V2 = 1/3 V or 0.33 V
n2 = ?
V1/n1 = V2/n2
V1n2 = V2n1
n2 = V2n1/V1
n2 = 0.33 V * 2.95/V
n2 = 0.974 moles
Which of the following elements would be the most stable (unreactive)?
1 ) Fr
2) Fe
3) H
4) Ne
4) Ne
General Formulas and Concepts:Chemistry
Atomic Structure
Reading a Periodic TableExplanation:The most stable (unreactive) elements are found in group 18. They are known as the Noble Gases.
Noble Gases are inert, meaning they do not react easily with other elements. The reason is because their valence electron shells are filled.
Therefore, our best answer is 4) Ne.
Answer:
[tex]\boxed {\boxed {\sf 4. \ Ne }}[/tex]
Explanation:
On the Periodic Table, the last group of elements are the Noble Gases. These are the most unreactive or stable elements.
According to the Octet Rule, atoms always want to have 8 valence electrons. The Noble Gases already satisfy this rule and have full outer shells, therefore they don't react with other elements often.
The Noble Gases are helium (He) , neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
The only answer choice that is a Noble Gas is 4. Ne
The following do not represent valid ground-state electron configurations for an atom either because they violate the Pauli exclusion principle or because orbitals are not filled in order of increasing energy. Indicate which of these two principles is violated in each example or whether both or neither are violated.
Part 1
1s22s23s2
A) The orbitals are not filled in order of increasing energy.
B) The Pauli exclusion principle is violated.
C) Orbitals are not filled in order of increasing energy and the Pauli exclusion principle is violated.
D) The ground-state electron configuration is valid.
Part 2
[Rn]7s26d4
A) The orbitals are not filled in order of increasing energy.
B) The Pauli exclusion principle is violated.
C) Orbitals are not filled in order of increasing energy and the Pauli exclusion principle is violated.
D) The ground-state electron configuration is valid.
Part 3
[Ne]3s23d5
A) The orbitals are not filled in order of increasing energy.
B) The Pauli exclusion principle is violated.
C) Orbitals are not filled in order of increasing energy and the Pauli exclusion principle is violated.
D) The ground-state electron configuration is valid.
Answer:
For both cases the answer is C
Explanation:
We can see that the orbitals are not filled in the order of increasing energy and the Pauli exclusion principle is violated because it does not follow the correct order of the electron configuration; In the first exercise after the 2s2 orbital, the 2p2 orbital follows.
For the second exercise, you must start in order with level 1 and correctly filling each of the sublevels corresponding to each level until reaching level 7 and thus completing the desired number of electrons.
The Pauli exclusion principle shows the correct sequence of filling electrons into orbitals.
For the electron configuration; 1s22s23s2, we can see that the orbitals are not filled in order of increasing energy because the 3s orbital follows the 2p orbital which has been omitted.
For the configuration; Rn]7s26d4, the orbitals are not filled in order of increasing energy because the 6d orbital follows the 5f orbital and not the 7s orbital as written.
For the configuration; [Ne]3s23d5, orbitals are not filled in order of increasing energy and the Pauli exclusion principle is violated. one of the electrons in the 3s and 3d levels will have exactly the same value for all four quantum numbers.
The order of increasing energy of atomic orbitals is; 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.
Learn more: https://brainly.com/question/8155254
How much energy would it take to heat a section of the copper tubing that weighs about 535.0 g , from 15.29 ∘C to 21.30 ∘C ? Copper has a specific heat of 0.3850 (J/g)⋅∘C.
Answer:
1238 J
Explanation:
Step 1: Given data
Mass of copper (m): 535.0 gSpecific heat of copper (c): 0.3850 J/g.°CInitial temperature: 15.29°CFinal temperature: 21.30°CStep 2: Calculate the change in the temperature
We will use the following expression.
ΔT = 21.30°C - 15.29°C = 6.01°C
Step 3: Calculate the energy required to heat the temperature of the copper tubing (Q)
We will use the following expression.
Q = c × m × ΔT
Q = 0.3850 J/g.°C × 535.0 g × 6.01°C
Q = 1238 J
PLEASE HELP!! DUE IN 5 MINUTES POLARITY CHEMISTRY
Answer:
t
Explanation:
the answer is H and O becccause h and o are opposite charges
When equal volumes of 0.5 M HCl and 0.5 M Ca(OH)2 are mixed, the resulting solution is
The concentration of mixed solution = 0.5 M
Further explanationGiven
0.5 M HCl
0.5 M Ca(OH)₂
Required
The concentration
Solution
Molarity from 2 solutions :
Vm Mm = V₁. M₁ + V₂. M₂
m = mixed solution
V = volume
M = molarity
V = mixed volume
1 = solution 1
2 = solution 2
Vm = V₁+V₂
Equal volumes⇒V₁=V₂, and Vm = 2V, then equation becomes :
2V.Mm = V(M₁+M₂)
2V.Mm = V(0.5+0.5)
Mm=0.5 M
How is sound produced?
Answer:
How Is Sound Produced?
Sound is a very important part of our life.
Sound helps us to communicate with another person.
Let's discuss some sounds in our daily life.
SOUND IS PRODUCED BY VIBRATIONS
The cover of the drum vibrates.
So, sound is produced when an object vibrates.
Sound is a form of energy which is produced as a result of the vibrations of an object.
Explanation:
Answer:
Explanation:
Sound is produced when an object vibrates creating a pressure wave As the particles vibrate they move nearby particles transmitting the sound further through the medium The human ear detects sound waves when vibrating air particles vibrate small parts within the ear
In the chemical reaction 2 AlCl3 ---> 2 Al + 3 Cl2, the substances Al and Cl2 are called the
Answer:
Products
Explanation:
The substances Al and Cl₂ can both be referred to as the product of the chemical action.
Products of a chemical reaction are usually found on the right hand side. They are the new substances that are produced from the reaction between two or more substances on the right hand of the chemical reaction.
When two species combines, they give a product. A single substance can also decompose to give products.
In the given reaction, we have been given a decomposition reaction and the products are Al and Cl₂.
How many total atoms are in 4Al2O3?
Answer:20
Explanation:
The number of atoms that are present in 4Al₂O₃ is 24×10²³atoms.
What is Avogadro's number?Avogadro's number is the number of entities that are present in one mole of any substance, i.e.
1 mole = 6.022 × 10²³ atoms
Coefficient present in the given compounds gives idea about the moles of that substance. In 4Al₂O₃ number of moles of Al₂O₃ is 4.
Number of atoms of Al₂O₃ in 4 mole = 4mol × 6.022 × 10²³atoms/mol = 24×10²³atoms
Hence number of atoms of Al₂O₃ in 4 moles of 4Al₂O₃ is 24×10²³atoms.
To know more about Avogadro's number, visit the below link:
https://brainly.com/question/1513182
#SPJ2
Which gas has the greatest kinetic energy at STP?
O He
O 02
O Ar
O None of the above (All have the same kinetic energy.)
Answer:
He has the greatest kinectic energy at stp
what is the kinetic energy at A? K.E. =
Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
How many grams are in 5 moles of 7.75 grams?
Answer:
21
Explanation:
bcecause thats the only one
What is one of the concerns about judges. Facing election?
Answer:
elections my compromise judicial impartiality
Answer:
one of them will probably argue with another person
Explanation:
Iron metal reacts with elemental oxygen to form rust according to the unbalanced reaction, Fe(s) + O2(g) → Fe2O3(s),. What is the coefficient of the iron, Fe(s), in the balanced reaction?
a
1
b
2
c
3
d
4
Time left for this assessment:
48:49
Answer:
c. 3
Explanation:
The unbalanced reaction expression is given as:
Fe + O₂ → Fe₂O₃
To balance the expression gives the coefficient of oxygen.
Assign the coefficients a,b, c and use a mathematical approach to solve this problem:
aFe + bO₂ → cFe₂O₃
Conserving Fe: a = 2c
O: 2b = 3c
Now let c = 1, a = 2, b = [tex]\frac{3}{2}[/tex]
Multiply through by 2,
a = 4, b = 3 and c = 2
4Fe + 3O₂ → 2Fe₂O₃
The coefficient of O₂ is 3
Methane (CH4), ammonia (NH3), and oxygen (O2) can react to form hydrogen cyanide (HCN) and water according to this equation:
CH4+NH3+O2→HCN+H2O. A student has 8 g of methane and 10 g of ammonia in excess oxygen.
a. What is the balanced equation for this reaction?
b. Which reagent is limiting? Explain why.
c. How many grams of hydrogen cyanide will be formed?
Answer: a. [tex]2CH_4+2NH_3+3O_2\rightarrow 2HCN+6H_2O(g)[/tex]
b. [tex]CH_4[/tex] is the limiting.
c. 13.5 g of hydrogen cyanide will be formed
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of methane}=\frac{8g}{16g/mol}=0.50moles[/tex]
[tex]\text{Moles of ammonia}=\frac{10g}{17g/mol}=0.59moles[/tex]
The balanced reaction will be :
[tex]2CH_4+2NH_3+3O_2\rightarrow 2HCN+6H_2O(g)[/tex]
According to stoichiometry :
2 moles of [tex]CH_4[/tex] require = 2 moles of [tex]NH_3[/tex]
Thus 0.5 moles of [tex]CH_4[/tex] will require=[tex]\frac{2}{2}\times 0.5=0.5moles[/tex] of [tex]NH_3[/tex]
Thus [tex]CH_4[/tex] is the limiting reagent as it limits the formation of product and [tex]NH_3[/tex] is the excess reagent as it is present in more amount than required.
As 2 moles of [tex]CH_4[/tex] give = 2 moles of [tex]HCN[/tex]
Thus 0.5 moles of [tex]CH_4[/tex] give =[tex]\frac{2}{2}\times 0.5=0.5moles[/tex] of [tex]HCN[/tex]
Mass of [tex]HCN=moles\times {\text {Molar mass}}=0.5moles\times 27g/mol=13.5g[/tex]
Thus 13.5 g of [tex]HCN[/tex] will be produced from the given masses of both reactants.
Methanol is stored at the temperature of 60degree, the vapor pressure of methanol is 13.2kPa at 20degree and 347kPa at 100degree.
Answer: im only in 6th grad sory
Explanation:
