Combination reaction: 8 Cu + S8 8 CuS in terms of chemistry. There are multiple reactants and multiple products.
Combination reaction: what is it?Combination reactions occur when two or more substances combine to form a single new substance. Composite processes are also referred to as synthetic reactions. The typical structure of an active components is A+BAB. A combination reaction occurs when two components combine to form a compound.
What qualities make into a combination reaction?A combination synthesis can involve any number of different reactants. A non-metal and a metal combinations reaction every time leads to an electrolytic process. Combination conformational changes fall into one of three categories. In particular, they consist of two elements combined, two compounds combined, and one element combined with one compound.
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What do these two changes have in common?
sauce burning on a stove
firing a clay pot in a hot kiln
Both are caused by cooling
Both converse mass
Both are chemical changes
Both are physical changes
sauce burning on a stove and firing a clay pot in a hot kilnBoth are physical changes. Therefore, option D is correct.
What are physical changes?Physical changes can be defined as changes affecting the state of a chemical substance, but not its composition. Physical changes can be used to separate mixtures into their component compounds, but can not generally be used to separate compounds into elements or simpler compounds.
Physical changes takes place when substances undergo a change that can not change their composition. while the chemical change in which the composition of a substance changes when substances combine or break up to form new substances.
In general a physical change can be consideed as reversible using physical means. A physical change includes a change in physical properties such as change of strength, change of durability, textural change, shape, size, volume and density.
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Use Le Châtelier’s principle to predict what will happen to the following equilibrium if the volume is decreased.
2NH3(g) ↔ N2(g) + 3H2(g)
Answer:
The reverse reaction is favoured
Explanation:
According to the principle; when a constraint such as a change in concentration, pressure, temperature etc is imposed on a reaction system in equilibrium, the equilibrium position will shift in such a direction as to annul the constraint.
In this case, the constraint is a change in volume. If the volume is decreased, the reverse reaction (leading to less total volume) is favoured.
The forward reaction leads to four volumes while the reverse reaction leads to only two volumes. Decrease in volume favours the direction in which the total volume is lower.
Fusion of hydrogen is the main source of the sun's energy.
True False
Answer:
True
Explanation:
Fusion of hydrogen is the main source of the sun's energy.
Answer:
The primary source of solar energy, and that of similar size stars, is the fusion of hydrogen to form helium (the proton–proton chain reaction), which occurs at a solar-core temperature of 14 million kelvin.
so I think true
Are group 1 or group 2 elements more reactive?
The elements belonging to group 1 are more reactive than elements belonging to group 2.
The elements that belongs to s block elements are hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). The nature of alkali metals is soft and shiny in appearance. They have low melting point and are highly reactive in nature and usually tarnish when exposed to air. Sodium (Na) is the most reactive element since it's valence electrons are not tightly held together in the atom. The three elements that are highly reactive are Lithium (Li), Sodium (Na), and potassium (K). The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive.
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What are two physical properties of lead?
Answer:
low melting point, high density, and acid resistance
Explanation:
How many moles of K2SO4 are in 216. g of K2SO4? (molar mass = 174.26 g/mol)
Answer:
1 grams K2SO4 to mol = 0.00574 mol
10 grams K2SO4 to mol = 0.05739 mol
50 grams K2SO4 to mol = 0.28693 mol
100 grams K2SO4 to mol = 0.57386 mol
200 grams K2SO4 to mol = 1.14772 mol
500 grams K2SO4 to mol = 2.86929 mol
1000 grams K2SO4 to mol = 5.73858 mol
What is the molarity of a solution in which 0.23 moles of NaCl are dissolved in enough water to make 395.6 mL of solution
The molarity of NaCl in enough water is 0.582[tex]\frac{mol}{mL}[/tex]
The moles of NaCl is given which is 0.23 and NaCl is dissolved in enough water which makes the solution of 395.6 mL.
The total number of moles of solute present in a given solution per litre is known as its molarity. In contrast to mass, which varies as the system's physical circumstances vary, the volume of a solution changes as a function of changes in the system's physical qualities, such as pressure and temperature. This has an impact on the molality of the solution. The symbol M, sometimes known as a molar, denotes molarity. A solution is considered to be one molar when one gram of the solute dissolves in one litre of the solution.
So, the molarity= [tex]\frac{totalnumber of moles}{total volume }[/tex]
molarity=[tex]\frac{0.23}{0.395}[/tex]
molarity=0.582[tex]\frac{mol}{mL}[/tex]
Hence, the molarity is 0.582.
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Base your answer on the choices below. (A) Pauli exclusion principle (B) Heisenberg uncertainty principle (C) Hund's rule (D) Wave nature of matter Which is responsible for interference patterns being exhibited by electrons
Wave nature of matter is responsible for interference pattern being exhibited by electrons.
Shortly after de Broglie proposed the wave nature of matter, two scientists at Bell Labs, C.J. showed experimentally that electrons can exhibit wave-like behavior. The wave-like motion of electrons is mathematically described by the so-called Bloch wave function. Named after his 20th-century physicist Felix Bloch, who first described the behavior of electrons in crystalline solids, these wavefunctions are complex. That is, it has both real and imaginary components.
These waves are called matter waves because electrons are a type of matter. Here,we relate the quantitative features of matter waves to familiar and measurable physical quantities such as energy, mass, and momentum.
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why was the bohr model replaced
Answer:
The Bohr model of the atom was replaced by the quantum mechanical model because it was unable to explain the behavior of electrons in atoms. The quantum mechanical model was able to explain the behavior of electrons in atoms more accurately.
Explanation:
7. Explain the role of the digestive system in animals, as well as how the system works! PLEASE I WILL GIVE BRAINLIEST
How many atoms of K are present in 195. 49 grams of K?
O 3. 0110 x 1024
O 6. 0220 x 1024
O 1. 1772 x 1026
0 4. 5797 x 1027
The number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.
We are to determine the number of K atoms present in 195.49 grams of K.
First, we will determine the number of moles K present
number of moles =[tex]\frac{mass}{molar mass}[/tex]
Atomic mass of K = 39.0983 g/mol
Number of moles of K present = [tex]\frac{195.49}{39.09}[/tex]
Number of moles of K present = 4.99996 moles
Number of moles of K present ≅ 5 moles
Now, for the number of atoms present
From the formula
Number of atoms = Number of atoms × Avogadro's constant
Number of K atoms present = 5 × 6.022 × 10²³
Number of K atoms present = 5 × 6.022 × 10²³
Number of K atoms present = 30.11 × 10²³
Number of K atoms present = 3.0110 × 10²⁴ atoms
Hence, the number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.
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What are the types of chemical bonds? Describe each.
Why do the fourth and fifth periods contain 18 elements rather than 8 as observed in the second and third periods?
The fourth and fifth periods contain 18 elements rather than 8 as observed in the second and third period because of the accommodation of 10 additional electrons in the 3d orbital.
The number of orbitals that can be accommodated by s subshell is one, p subshell is three, d subshell is five and f subshell is seven.
In the second and the third period, the 2s subshell is filled with two electrons, 2p subshell with six electrons .So, the second period contains eight elements. The sequence in third period is similar to that of second period with additional filling of 3s and 3p subshell.
In the fourth period, electrons are first filled in the 4s subshell, only after that they can be filled in the 3d subshell. So, fourth period contains 18 elements , which is due to the additional 10 electrons in 3d subshell. This is similar in the case of fifth period also.
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Isabella tiene una pileta que tiene una superficie de 678,32 dam2 mientras que Tadeo tiene una de 865,42 dm2. ¿Cuál pileta tiene mayor superficie?
Isabella has a pool that has an area of 678.32 dam² while Taddeo has one of 865.42 m². Which pool has the largest surface area?
Solution :
We know, 1 dam² = 100 m².
So, area of Isabella pool in m² is :
A = 678.32 × 100 m² = 67832 m² .
Therefore, area of Isabella is greater that volume of Taddeo .
How many formula units are in 26.5 g MgCl2?
Answer:
95.211 g/mol
Explanation:
For example magensium chloride has the formula unit MgCl2 , i..e., for every magnesium cation there are two chloride anions in the crystal. Or, we would say that the formula weight of MgCl2 = 95.211 g/mol.
what type of bonding exists within a carbon dioxide molecule?
A)Covalent
B)Metallic
C)Metalloidic
D)Ionic
Answer:
A
Explanation:
covalent bond exists in carbon dioxide
In what part of this system are the two energy outputs found?
The part of the system that has two outputs of energy is the bulb.
What is the energy transformation?We would have to recall that on the basis of the first law of thermodynamics, it can be said that energy can not be created nor destroyed but that energy would have to be converted from one form to the other.
In this case, we can see that as the boy is cycling, there is the conversion of the mechanical energy of the boy to the heat and the light energy of the bulb as shown. These are the outputs referred to above.
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Consider the following equation.
Zn(s) + 2HCl(aq) - ZnCl(aq) + H2O)
Which substance is oxidized?
Answer:
HCl
Explanation:
Hydrochloric acid is oxidized to water
Does carbon-14 or nitrogen-14 have more neutrons?
Carbon 14 would have more neutron than nitrogen 14
The atomic number of an atom, as is generally known, represents the total number of protons that make up the nucleus of that atom. We are aware that the mass number of carbon is 14, and that its atomic number is 6. It is well-known that protons and neutrons combine to form mass. As a result, there will be = 14 - 6 = 8 neutrons.
while he mass number of nitrogen is 14, and that its atomic number is 7. It is well-known that protons and neutrons combine to form mass. As a result, there will be = 14 - 7 = 7 neutrons.
Therefore, Carbon 14 would have more neutron than nitrogen 14
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Which statement best explains why the atomic theory developed efficiently?
Scientists ignored all previous knowledge about atoms.
Scientists had used creativity and the scientific method in their investigations.
Scientists had used a philosophical viewpoint as a method of investigation.
Scientists rarely repeated experiments to make sure the results were correct.
The statement which best explains why the atomic theory developed efficiently is that scientists had used creativity and the scientific method in their investigations regarding the atom.
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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Answer: the answer is B
Explanation: just did it hope it helps
A man-made device that is used to replace or enhance a body part is called
what?
A. A nanotube
B. A scaffold
C. A prosthesis
D. A pacemaker
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
A man-made device that is used to replace or enhance a body part is called :
A. A nanotube
B. A scaffold
C. A prosthesis
D. A pacemaker
➜Option C. A prothesis is correct!
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A solution is created by dissolving 12.0 grams of ammonium chloride in enough water to make 255 mL of solution. How many moles of ammonium chloride are present in the resulting solution
The number of moles of ammonium chloride present in a solution created by dissolving 12 grams of ammonium chloride in water to make 255 ml solution is 0.224 mol.
The number of moles of a substance is defined as the ratio of the mass of the substance to the molar mass of the substance. It is denoted by "n". It is given as
n=mass/molar mass
Given,
mass of ammonium chloride= 12 grams
we know that,
atomic mass of Nitrogen(N) = 14g /mol
atomic mass of Hydrogen (H) = 1 g/mol
atomic mass of Chlorine (Cl)= 35.5 g/mol
molar mass of ammonium chloride (NH₄Cl)
= ( 14+ 1×4 + 35.5) g/mol
=53.5 g/mol
therefore,
number of moles of ammonium chloride
= mass/molar mass
=12g/53.5gmol⁻¹
=0.224 mol
Thus, 0.224 moles of ammonium chloride are present in the resulting solution.
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How does burning forest impact the atmosphere
Answer: The smoke can deplete the ozone layer
If an automobile air bag has a volume of 11.8 L, what mass of (in g) is required to fully inflate the air bag upon impact
22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.
What is decomposition reaction?Chemical decomposition, also known as chemical breakdown, is the process of breaking down a single chemical entity into two or more components. Chemical breakdown is commonly thought of and characterized as the inverse of chemical synthesis. When one reactant breaks down into two or more products, this is referred to as a decomposition reaction. This is expressed by the following generic equation: AB A + B. The breakdown of hydrogen peroxide to water and oxygen is an example of a decomposition process, as is the breakdown of water to hydrogen and oxygen.
Here,
In airbags, sodium azide decomposes to form sodium and nitrogen gas, which inflates the bag. The decomposition reaction is:
2 NaN₃ ⇒ 2 Na + 3 N₂
We can calculate the mass of NaN₃ needed to produce 11.5 L of N₂ at STP, using the following relations.
At STP, 1 mole of N₂ occupies 22.4 L.
The molar ratio of N₂ to NaN₃ is 3:2.
The molar mass of NaN₃ is 65.01 g/mol.
=11.8*1/22.4*2/3*65.01/1
=118/112*21.67
=22.82 g
22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.
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What are the 3 types of elements?
The three types of elements are metals, non-metals as well as metalloids, there are placed in a periodic table.
In a periodic table, metals are placed in s-block and d-block. While non-metals as well as metalloids are placed in p-block. Metals are generally lustrous, malleable as well ductile in nature and are usually hard in nature while non-metals lack these properties. Metalloids are the elements whose chemical as well as physical properties lies between both metals and non-metals. Examples of metals are sodium and potassium. Examples of non-metals are carbon and phosphorus while examples of metalloids are silicon and germanium.
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A sample of a gas has a mass of 14.2g and occupies a volume of 0.678 liters at 25 C and a pressure of 0.80 atm. what is the density of a gas under these conditions
The density of gas can change, in contrast to the density of solids or liquids. This is due to the fact that gas is not compact and that temperature and pressure have an impact on its molecules.
The formula is d = MP/RT, where d is the gas's density in kilograms per liter, M is its molar mass in grams per mole, P is its pressure in atmospheric pressure units, and R is the gas law constant. The equation demonstrates that the molar mass increases as gas density increases. The pressure and temperature parameters for the gas determine the gas's density. Gas can dramatically alter its volume with a change in pressure due to its strong compressibility. Therefore, changes in density (at low pressure) can be substantial.
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Write the entire chemical equation and label the reactants and products.
C3H8 + 5 O2 → 3 CO2 + 4 H2O
Answer:the equation is already balanced and the reactants are the C3H8+ 5 O2 and the products are 3CO2+ 4H2O
Explanation:
What is iupac name of this compound
Answer:
Explanation:
The lupac name of this compound is 2-Oxohexanoic acid. This compound is composed of two oxygen atoms, six carbon atoms, and one hydrogen atom. The parent chain is made up of six carbon atoms, and the functional group is a carboxylic acid group (COOH)
How many grams do 5.6 × 1026 atoms of helium weigh?
One mole of Helium contains 6.02 × 10²³ atoms. Mass of one mole is 4 g. Then, He containing 5.6 × 10²⁶ atoms weighs 3720.9 g.
What is Avogadro number?Any substance containing 6.02 × 10²³ atoms is called one mole of that substance. This number is called Avogadro number. Thus, one mole of every element contains Avogadro number of atoms.
Helium is second element in periodic table. Atomic mass of helium that is mass of one mole = 4 g
4 g contains 6.02 × 10²³ atoms. Then weight of He containing 5.6 × 10²⁶ atoms is calculated as follows:
no. of moles = 5.6 × 10²⁶/ 6.02 × 10²³ = 930.2
mass of 930.2 moles = 930.2 × 4 =3720.9 g
Therefore, the mass of He containing 5.6 × 10²⁶ atoms is 3720.9 g.
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What type of elements for ionic bonds with one another ?
Answer:
metals and nonmetal ions
Explanation:
Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.