To balance a chemical equation, you can only adjust the coefficients; you cannot change the subscripts. The ratios of the atoms in the molecule and the resulting chemical characteristics are altered by changing subscripts.
What occurs if the subscript in a chemical equation is changed?Changing the coefficients solely affects the quantity of molecules in that specific chemical. However, modifying the subscripts will change the substance itself, rendering your chemical equation incorrect.
What distinguishes altering a subscript from altering a coefficient in a chemical formula?You can determine the substance from the subscript. You can find out how much of each element is present in the molecule. The substance itself would change if it were altered. In contrast, simply altering the coefficient results in a change in the number of molecules.
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Which aqueous solution is expected to have a pH less than 7 at 25∘C?
a) LiNO3 (aq)
b) NH4Br (aq)
c) RbC2H3O2 (aq)
d) MgCl2 (aq)
[tex]NH_{4} Br[/tex](aq ) is expected to have a Ph less than 7 as on dissociation the following constituents will separate
[tex]NH_{4} Br[/tex] + [tex]H_{2}O[/tex] → [tex]NH_{4} OH[/tex](weak base) + [tex]HBr[/tex] (strong acid)
A weak base is a strong acid hence B is correct
[tex]LiNO_{3}[/tex] It is a salt of a strong base and weak acid hence basic and a PH greater than 7
[tex]MgCl_{2}[/tex]it is a salt of a strong base and strong acid hence a neutral solution of PH 7
[tex]RbCH_{2} H_{3} O_{2}[/tex] It is a salt of a strong base and weak acid hence basic and a PH greater than 7
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An increase in the temperature of a liquid decreases the rate of
evaporation, true or false?
Answer:
False
Explanation:
The increase in the temperature of a liquid also increases the rate of evaporation, as the same for the other way around. As intermolecular force increase rate of evaporation decreases. This happens because intermolecular force make it less likely for the molecules on the surface to escape from liquid and become vapour gas. As temperature increases rate of evaporation increases.
When you boil a pot of liquid water, the water turns to steam and rises in the air. This is an example of what.
A: condensation
B: precipitation
C: evaporation
D: absorption
Answer:
Hello There!!
Explanation:
The answer is C: evaporation because evaporation is the process in which a liquid boils then evaporates and lastly becomes a gas.
hope this helps,have a great day!!
~Pinky~
According to the forces of attraction, when you boil a pot of liquid water, the water turns to steam and rises in the air. This is an example of evaporation.
What are forces of attraction?
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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What are the types of elements answer?
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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Electroplating is a way
to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. In essence the
metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution
Suppose a current of 0.490 A is passed through an electroplating cell with an aqueous solution of AgNO_3, In the cathode compartment for 90.0 seconds.
Calculate the mass of pure silver deposited on a metal object made into the cathode of the cell.
Be sure your answer has a unit symbol and the correct number of significant digits.
Answer:
0.049 g of Ag
Explanation:
From the question;
Ag^+ (aq) + e ----->Ag(s)
1 e = 96500 C
Note that Q= It
Where;
I = current and t= time taken
108 g of silver is deposited by 96500 C of electricity
x g is deposited by (0.49 * 90) C
x = 108 * (0.49 * 90) /96500
x= 0.049 g of Ag
Rutherford used his gold foil experiment as evidence for a new atomic model. He suggested that the atom contained a small
positively charged nulceus surrounded by a large void filled with only a few electrons orbiting the nucleus.
What other experiment or evidence assisted in the creation of this model?
A)
Electrons in orbit would be captured by a nucleus.
B)
The precise location of an electron is impossible to acertain.
o
The plum pudding model of the atom agreed with the nuclear model
D)
Thomson discovered the atom contained negatively charged electrons.
Nature of Science
SC6N22) New Evidence
ID:7495
Answer:
The plum pudding model of the atom agreed with the nuclear model
Explanation:
Answer:
D) Thomson discovered the atom contained negatively charged electrons.
Explanation:
Without previous discoveries such as the electron, Rutherford would not have generated his nuclear model. So, Thomson had to discover the atom contained negatively charged electrons first.
Hope this helps :)
Which of the following is a characteristic of a strong acid?
O A. It does not conduct electricity in water.
B. It completely dissociates in water.
C. It reacts with water to form H2 gas.
O D. It increases the OH concentration.
The statement, that describes the characteristic of a strong acid is "it completely dissociates in water."
What is a strong acid?
In aqueous solution, strong acids and bases are completely ionised.
A strong acid is one that entirely ionises in solution. When dissolved in water, it emits the maximum number of hydrogen ions or protons, implying that it always loses a proton (H+).
As a result, it is possible to deduce that a strong acid (HA) entirely dissociates in solution.
Hence the correct option is B.
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What happens when ocean water that is more dense (colder or saltier) is mixed with water that is less dense (warmer or less salty)?
please make it sound like i wrote it :(
When ocean water that is more dense (colder or saltier) is mixed with water that is less dense (warmer or less salty), the denser water will sink to the bottom and the less dense water will rise to the top. This is known as stratification, and it helps to create distinct layers in the ocean.
This stratification can create an environment that is more conducive to life, as it allows different types of organisms to inhabit different layers of the ocean.
The different layers of the ocean created by stratification play a significant role in the global climate system. Colder, denser waters are usually found at the bottom of the ocean, while warmer, less dense waters are found near the surface.
This temperature difference creates a natural convection system that drives currents throughout the ocean, which helps to regulate temperatures on a global scale. Additionally, stratification can also affect the amount of oxygen in the ocean.
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Which argument supports the claim that dissolving calcium chloride (CaCl2) in water is a chemical change
The argument that supports the claim that dissolving solid calcium chloride (CaCl2) in water is a chemical change is A. The ionic bond among calcium and chloride ions has been broken..
When solid calcium chloride is added to water, the ionic bonds between the calcium ions (Ca2+) and chloride ions (Cl-) are broken apart by the polar water molecules. The calcium ions and chloride ions are then surrounded by the water molecules, forming a new chemical compound called calcium chloride hydrate (CaCl2*xH2O) which is different from the original solid calcium chloride. This process is a chemical change because it creates new substances and the original chemical bonds are broken and new bonds are formed.
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the complete question is:
Which of the following arguments supports the claim that dissolving calcium chloride (CaCl2) in water results in a chemical change?
A. The ionic bond among calcium and chloride ions has been broken.
B. By evaporating the water, the solid calcium chloride can be recovered.
C. The ions found in the solid remain in the solution and have not changed.
D. Ions are attracted by the polar water molecules.
Consider the reaction.
NH4HS(s)⇌NH3(g)+H2S(g)
At a certain temperature, Kc=8.5×10−3. In a reaction mixture at this temperature containing solid NH4HS, [NH3]=0.166 M and [H2S]=0.166 M. Will more of the solid form or will some of the existing solid decompose as equilibrium is reached?
In the reaction, NH4HS(s)⇌NH3(g)+H2S(g), more of the solid will form.
What is equilibrium?In a chemical reaction, equilibrium is the state where both the reactants and products are present in concentrations which have no further tendency to change with time, so there is also no observable change in the properties of the system. This state results when forward reaction proceeds at the same rate as reverse reaction.
If Q= K then equilibrium
Q>k, then reversed direction shift
Q<k, then forward direction shift
Given, Kc=8.5×10−3
Given [NH3]=0.166 and M [H2S]=0.166 M
Here Q= 0.166 M (given)
It shows Q> k that is 0.166 > 8.5×10−3
Therefore, more of the solid will form.
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List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3 pi
There is one sigma as well as one pi bond in a double bond.
Sigma bonds and pi bonds are the two types of covalent bonds. Sigma bonds are formed when there is an end-to-end overlapping of the atomic orbitals. A pi bond is formed when there is a lateral or a side-by-side overlapping of the atomic orbitals.
The sigma bonds are represented by a "σ" symbol and pi bonds are represented by "π" symbol. One sigma bond is there in a single bond. A double bond contains one sigma as well as one pi bond. A triple bond has one sigma as well as two pi bonds.
--The given question is incomplete, the complete question is
"List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3pi, 1pi 1 sigma."--
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when a set amount of marble chips (caco3) is added to a small amount of dilute hydrochloric acid, a reaction occurs. what should be done to decrease the rate of reaction the next time the experiment is performed
A tiny amount of weak hydrochloric acid is mixed with a quantity of marble chips (CaCO3), to decrease the rate of reaction we do decreasing the surface area of the marble chips, decreasing conc. HCL and many more.
Several ways are:-
1. Decreasing the surface area of the marble chips: By breaking the marble chips into smaller pieces, the surface area that is available for the acid to react with is reduced, slowing down the reaction.
2. Decreasing the concentration of the hydrochloric acid: By using a less concentrated solution of hydrochloric acid, the number of acid molecules available to react with the marble chips is reduced, slowing down the reaction.
3. Increasing the temperature: By performing the reaction at a lower temperature, the kinetic energy of the acid and marble chip molecules is reduced, slowing down the rate of collision between them, which slows down the reaction.
4. Using a catalyst: Addition of a catalyst to the reaction can change the reaction mechanism and decrease the activation energy needed for the reaction to occur, thus slowing down the reaction.
5. Using an inhibitor: An inhibitor is a substance that slows down the reaction by binding to the enzyme or catalytic site and preventing the substrate from binding.
It's important to note that these methods may also affect the overall yield of the reaction, so it's essential to use the appropriate method(s) for the specific experiment and goals.
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what is the molar mass of c2h16?
use 4 significant figures in your answer.
Answer:
40.15 g/mol
Explanation:
The molar mass of c2h16 is
40.1484 g/mol ≈ 40.15 g/mol (rounded to 4 significant figures)
In an atom that has lost an electron, the place vacated by the free electron is referred to as a(n)
The space left by the free electron in an atom after it has lost one electron is known as a hole.
The term "free electron" refers to an electron that has broken loose from its "parent" atom and is now free to move about the material at random. A vacancy, also known as a hole, is created in the atom when a bonded electron in a lattice atom breaks free. The number of electrons in an atom's valence shell, or n shell in this example, has a significant impact on the electrical properties of the element that the atom represents. The least force of attraction is felt by the electrons in the valence shell since they are the furthest from their nucleus.
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a scientist oserves a chemical reaction as it takes place. how can the scientist so in order to tell if the reaction has acheived equilibrium
A chemical reaction reaches equilibrium when the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in the concentrations of the reactants and products.
A scientist observing a chemical reaction can tell if the reaction has achieved equilibrium by monitoring the following: Concentration of reactants and products: The concentrations of reactants and products should no longer change over time if the reaction has reached equilibrium. Temperature: If the reaction has reached equilibrium, the temperature of the system should remain constant. Pressure: If the reaction is taking place in a closed container, the pressure of the system should also remain constant if the reaction has reached equilibrium. It's worth noting that the equilibrium is a dynamic process, meaning that the concentrations of reactants and products will remain constant over time, but the chemical reaction is still taking place.
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what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
Mass (often measured in grams) & volume are the two characteristics in this module through which we will create unit components to do statistical approach using different chemicals .
What exactly is a chemical substance?Chemical substances come in three different forms: elements, compounds, and mixtures. Elements are basically chemicals that don't contain any other substances. In this sense, elements are the fundamental constituents of chemical composition.
How should chemicals be categorized?The component can be an isotope or a combination if it is pure. If a substance can be divided into its component elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or even a heterogeneous mixture. If the composition remains the same throughout, the combination is homogeneous.
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Potassium(k)=1s22s22p63s23p64s
it’s asking for the electron configuration
The atomic number of Potassium(K) is 19
Knowing the number of electrons in the K atom is necessary before we can write the potassium(K) electron configuration.
There are 19 electrons. All 19 electrons will be positioned in orbitals surrounding the nucleus of the potassium(k) atom when the configuration is written.
there are some steps:
The initial two electrons in the configuration for potassium(k) will be in the 1s orbital.The following two electrons for potassium enter the 2s orbital since the 1s orbital can only accommodate two electrons. Then the 2p orbital receive the six electrons. The p orbital has room for up to six electrons. The first Six electrons will be positioned in 2p orbital, while the next two will be positioned in the 3s. As the 3s are currently full, we'll switch to the remaining six electrons to the 3p.Now we change the 4s orbital and add the final electron.To know more about Orbital, click here:
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As an ionic solid dissolves in water, the temperature of the solution increases. What best describes the enthalpy and entropy of the solution
The water solution gets hotter when an ionic solid dissolves in it. Entropy increases and there is a decrease in enthalpy change.
The spread of the solute molecules (and the thermal energy they carry) through the larger volume of the solvent during the dissolution of a solute typically results in a rise in entropy. When a liquid or solid dissolves in a solvent, entropy typically rises. Less negative entropy change is occurring (or perhaps even at this stage, positive). The chemicals will likely become more soluble as a result. The total result is a delicate balancing act between how the solution's enthalpy changes and how its entropy changes. When a substance is divided into several pieces, entropy rises. Entropy is raised via the disintegration process.
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16% of m is 28
16% x m = 28
0.16 x m = 28
m = ...
Answer:
m=175
Explanation:
100/16 = 6.25
6.25x28 = 175
Answer: To solve this equation for m, you can divide both sides of the equation by 0.16. This will give you:
m = 28 / 0.16
Simplifying the right side of the equation gives:
m = 175
Therefore, m = 175.
Explanation:
What is the difference between a solution and a suspension.
Answer:
In a solution, the solute particles that are in the solvent are evenly mixed and so small that you can't see them. In a suspension, the pieces of solute are large and can be seen floating throughout the solvent. For example, dust floating through the air is a suspension.
i need help asap now answer all blanks
Answer:
2
Explanation:
You want the coefficient of silver iodide in the equation ...
_AgI +_Na₂S ⇒ _Ag₂S +_NaI
Balanced equationThe equation is balanced when the numbers of each of the species is the same on each side of the equation.
We can write four equations in the four unknowns to find the coefficients, or we can use a little guesswork.
If we suppose the coefficient of silver sulfide (Ag₂S) is 1, that tells us the coefficient of silver iodide (AgI) will be 2. If that is the case, then there are two atoms of iodine that will make the coefficient of NaI be 2. This is consistent with the coefficient of Na₂S being 1, giving one Sulfur atom on each side of the equation.
The balanced equation is ...
2AgI +Na₂S ⇒ Ag₂S +2NaI
The coefficient of silver iodide is 2.
__
Additional comment
If the reaction is ...
a·AgI + b·Na₂S ⇒ c·Ag₂S + d·NaI
We can write the relationships between the coefficients as follows. This ultimately gives rise to 3 equations in 4 unknowns, so the choice of any given coefficient is arbitrary. We choose to use the smallest integers that satisfy the conditions.
The balance for Ag is ...
a = 2c
The balance for I is ...
a = d
The balance for Na is ...
2b = d
The balance for S is ...
b = c
Then, in terms of 'a' and 'b', we have ...
a = d = 2b = 2c
For b = c = 1, a = d = 2, as we determined above.
When using a TSO-C129 or TSO-C196 GPS for navigation and instrument approaches, any required alternate airport must have
TSO-C129 and TSO-C196 refer to non-WAAS GPS systems. TSO-C146 refers to WAAS-enabled GPS systems. If non-WAAS GPS is used for navigation and instrument approaches, all required alternate airports must have non-GPS approved operational instrument approach procedures.
TSO-C129 - Airborne Auxiliary Navigation Sensor for Global Positioning System equipment with airborne extensions. TSO-C196 – Auxiliary airborne navigation sensor for GPS units with airborne augmentation.
TSO certification means minimum performance standards for certain materials, parts and equipment used in commercial aircraft. Authorization to manufacture materials, parts, or equipment in accordance with TSO standards is referred to as TSO authorization.
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The table shows the nature of the reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products
Reactants Products
Ionic compound + Ionic compound Ionic compound + Ionic compound
Which of the following is true about this type of chemical reaction?
It is a single replacement reaction, and all four compounds are different.
It is a double replacement reaction, and all four compounds are different.
It is a single replacement reaction, and each compound has the same set of ions.
It is a double replacement reaction, and each compound has the same set of ions.
The reaction that has been shown in the table above is a double replacement reaction, and each compound has the same set of ions. Option D
What is a reaction?Another word that we can use for reaction is what we call a chemical change. We know that a chemical change is the kind of change that will lead to the formation of a new product. It is an irreversible process as we can not be able to get back the reactants again.
We should note that there are various types of reactions. In a single replacement reaction, you would notice that there is only one substance that reacts and causes a change while in the double replacement reaction, the anions that are in the compounds that underwent the reaction would just exchange anion partners and we would have two ionic products.
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Which of the following are advantages of a furnace over a flame in atomic absorption?
a. a smaller sample amount is required
b. memory effects from the previous run are not present in even the most basic version
c. the sample is atomized in only one heating step
d. less operator skill is required to determine the proper experimental conditions
e. higher sensitivity because the atomized sample is in the optical path longer
A furnace has an advantage over a flame in atomic absorption because it is more sensitive due to the lengthier time the atomized material remains in the optical path.
A process of absorption is what?Absorption in chemistry is the process by which a material that is already present in one state gets assimilated into another substance that is already present in another state (e.g., gases being absorbed by a liquid or liquids being absorbed by a solid).
What in chemistry are adsorption and absorption?Absorption and adsorption have quite different definitions. A liquid can be absorbed by a substance like a sponge, cloth, or filter paper. The absorbent substance absorbs all of the liquid. Adsorption describes the accumulation of single molecules, atoms, or ions on surfaces.
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When you squeeze the end of a toothpaste tube, toothpaste is pushed out the other end. This follows _________.
A. Boyle's Law
B. Charles' Law
C. Pascal's Principle
D. Bernoulli's Principle
Answer:
c. is the answer
Explanation:
c. Pascal principal
1. Assertion:Amobea is unicellular organism and has no organs for
breathing.
R: Respiration of amobea is by diffusion.
Answer:
Amoeba has no special respiratory organs and no respiratory pigments but there is a free exchange of gases by diffusion through the general body surface which is permeable to the gases dissolved in water
When 10g of hydrogen gas react with chlorine gas, how many liters hydrogen monochloride (HCl) will be produced at STP
The amount of hydrogen monochloride that is produced at STP is 152 mL.
The balanced chemical reaction can be depicted as follows:
H₂ + Cl₂ -----> 2 HCl
According to stoichiometry, When one mole of hydrogen reacts with one mole of chlorine, it yields two moles of hydrogen monochloride. Stoichiometry defines the relationship between the quantities of reactants and products before, during, and following chemical reactions
If, 2 g of Hydrogen reacts with 71 g of chlorine to form 73 g of Hydrogen Chloride.
Therefore, if 10 g reacts with 142 g of chlorine, the HCl produced will be 152 g or 152 ml of HCl.
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Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 7.41 mL of O2 had passed through the membrane, but only 3.47 mL of of the unknown gas had passed through. What is the molar mass of the unknown gas
164 g is the molar mass of the gas that had passed through.
Effusion is defined as the pace at which a volume changes over time. We apply Graham's Law to determine the rate of gas diffusion. According to this law, the rate of a gas's effusion or diffusion is inversely related to the gas's molar mass squared.
[tex]\frac{Rate Gas 1}{Rate Gas 2}[/tex]=[tex]\frac{ \sqrt{MW gas 2} }{ \sqrt{MW gas 1} }[/tex]
Let gas 1 be Oxygen so Molar mass = 32 g / mol
Let x be gas 2. Molar mass = unknown
rate gas 1 = 7.41 ml/unit time
rate gas 2 = 3.47 ml / unit time
So, 7.41 / 3.47 = [tex]\frac{\sqrt{x} }{\sqrt{36} }[/tex]
2.135 = s[tex]\frac{\sqrt{x} }{\sqrt{36} }[/tex]
[tex]\sqrt{x}[/tex] = 12.81
so, x = 164 = molar mass of unknown gas
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Select all that identify an ionic bond.
metal - metal
metal - metal
metal - nonmetal
metal - nonmetal
nonmetal - nonmetal
nonmetal - nonmetal
metal - polyatomic
metal - polyatomic
polyatomic - polyatomic
polyatomic - polyatomic
polyatomic - nonmetal
Answer:
metal - metal
metal - metal
metal - polyatomic
metal - polyatomic
metal - nonmetal
metal - nonmetal
A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?
O Length
O Mass
O Temperature
O Volume
A chemist reported that 100 gallons of a gas were available in a laboratory, The property of the gas did the chemist report is volume option - D is correct answer.
Just what is volume?The space occupied by a three-dimensional object is measured using the scalar quantity known as volume. The volume of a liquid or gas is calculated using the container's capacity as the unit of measurement.
A state of matter known as gas lacks a consistent shape and a set volume. They are the least dense and have the most space between their moles.
A gallon is a unit of volume that is used in the American metric system. The volume of gas equals the sum of the moles of gas in the container, which contains 100 gallons of gas.
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