For the coin that is being flipped straight up we have the velocity at top of its trajectory (at the maximum height) will be 0.
The velocity of the coin at the top of its trajectory is zero because in maximum height the ball will stop and then will start to move down.
The acceleration will be zero if there is no variation in velocity of the object. At the highest point, the object has the no or the zero kinetic energy where all of its kinetic energy is converted into potential energy . The velocity of coin will be momentarily zero when it reaches its maximum height.
Therefore the velocity will be zero and the object does not accelerate.
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The formula of a base is written by showing the number of hydrogen ions needed to balance the positive charge on the cation. True or false
By indicating that the number of hydrogen ions required to balance the positive charge on the cation is True, the formula for a base can be written down.
In terms of H+ ions, what is a base?The hydroxyl ions (OH-) produced will mix with any hydrogen ions (H+) in the solution to generate water molecules (OH- + H+ = H2O), therefore we can also define a base as a substance that receives or accepts hydrogen ions (H+) that are already present in the solution.
A cation or an anion, is hydrogen?Hydrogen is an alkali metal with one electron in the outermost shell. It loses one electron to create a cation, H+, much like alkali metals.
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If a solution of NH3Br is cooled from 50 degrees Celcius to 10 degrees Celcius, what mass of crystals would form?
what grade is this for?
Explanation:
do the initial concentrations afect the equilibrium concentrations of reactants and products of a given reaction?
No, the initial concentrations affect the equilibrium concentrations of reactants and the products.
The equilibrium constant does not depend on the initial concentration of reactants but depends on concentration of various species at equilibrium .
The equilibrium constant is the ratio between the product of the molar concentrations of the products to that of the product of the molar concentrations of the reactants with each concentration term raised to a power equal to stoichiometric coefficient in the balanced chemical equation.
If you increase the concentration of a reactant or product participated in an equilibrium, the system will absorb some of the added material and after some time the system will re establish equilibrium. When you recalculate Keq, you get the same value.
It changes with the change in the temperature.
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HOMOGENEOUS VS.
HETEROGENEOUS MATTER
Classify the following substances and mixtures as either homogeneous or heterogeneous.
Place a ✔️ In the correct column.
HOMOGENEOUS
1. flat soda pop
2. cherry vanilla ice cream
3. salad dressing
4. sugar
5. soil
6. aluminum foil
Name
7. black coffee
HETEROGENEOUS
HOMOGENEOUS
✔️ 1. flat soda pop
✔️ 2. cherry vanilla ice cream
✔️ 3. salad dressing
✔️ 4. sugar
HETEROGENEOUS
5. soil
aluminum foil
black coffee
Homogeneous substances and mixtures are uniform in composition and have the same properties throughout. Heterogeneous substances and mixtures are not uniform in composition and can have different properties in different parts.
Flat soda pop is a homogeneous mixture because it is a uniform mixture of water, carbon dioxide gas, and various flavors and sweeteners.
Cherry vanilla ice cream is a homogeneous mixture because it is a uniform mixture of milk, cream, sugar, cherries, and vanilla flavor.
Salad dressing is a homogeneous mixture because it is a uniform mixture of oil, vinegar, and various flavors and seasonings.
Sugar is a homogeneous substance because it is a pure substance made up of molecules with the same chemical formula.
Soil is a heterogeneous mixture because it is made up of a combination of minerals, organic matter, water, and air, which can vary in composition and properties in different parts of the mixture.
Aluminum foil is a heterogeneous mixture because it is made up of thin sheets of aluminum metal mixed with other substances, such as coatings or additives, which can vary in composition and properties in different parts of the mixture.
Black coffee is a homogeneous mixture because it is a uniform mixture of water, coffee beans, and various flavors and aromas.
The classification of the substances and mixtures as either homogeneous or heterogeneous:
HOMOGENEOUS:
Flat soda pop: ✔️
Salad dressing: ✔️
Sugar: ✔️
Black coffee: ✔️
HETEROGENEOUS:
Cherry vanilla ice cream: ✔️
Soil: ✔️
Aluminum foil: ✔️
Any material or combination that is homogeneous throughout and difficult to discern with the eye is referred to as homogeneous matter. Due to their similar composition, flat soda pop, salad dressing, sugar, and black coffee are categorized as homogenous in this example.
Contrarily, heterogeneous matter describes substances or mixes that are visibly distinct and have an uneven or non-uniform composition. Aluminum foil, cherry vanilla ice cream, and dirt are all examples of heterogeneous materials since they all have distinct visible components or phases.
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how do green plants use air water and sunlight to make food during photosynthesis our teacher asked
Write the balanced molecular
chemical equation for the reaction of chlorine gas bubbled through aqueous sodium iodide. If no reaction occurs, simply write only NR. Be sure to include the proper
phases for all species within the reaction.
Answer:
Explanation:
Expert-Verified Answer. The balanced reaction that describes the reaction of chlorine gas and sodium iodide to produce elemental iodine and sodium chloride in aqueous solution is expressed Cl2+2NaI= I2 + 2NaCl.
Given a list of atomic model descriptions: a: electron shells outside a central nucleus b: hard, indivisible sphere c: mostly empty space which list of atomic model descriptions represents the order of historical development from the earliest to most recent?.
Earliest to Latest:
hard, indivisible spheres → mostly empty space → electrons shells outside a central nucleus
What are electron shells?
In chemistry and atomic physics, electron shells can be thought of as the orbits of electrons around the nucleus. The shells closest to the nucleus are ``1-shell'' (also called ``K-shell''), ``2-shell'' (or ``L-shell''), ``3-shell'' (or ``M-shell''), and so on. away The shells correspond to the principal quantum numbers (n = 1, 2, 3, 4...) or are labeled alphabetically with letters in X-ray notation (K, L, M,...). A useful guide to understanding the electron shells of atoms is to note that each row in the conventional periodic table of elements represents an electron shell.
What is nucleus?
The atomic number, or atomic number of a chemical element, is the number of electric charges in the nucleus. For normal atomic nuclei, this equals the number of protons, or the number of protons found in the nucleus of each atom of that element.
Therefore, Earliest to Latest:
hard, indivisible spheres → mostly empty space → electrons shells outside a central nucleus
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Identify the Bronsted-Lowry acid (loses an H+ ion), base (gains an H+ ion) and the conjugate acid, and the conjugate base in each of the following.
a. HNO3 + H2O <---> H3O+ + NO3-
A B C.A. C.B.
b. NH3 + H2O <---> NH4+ + OH-
c. H2SO4 + OH-<---> HSO4- + H2O
d. C2H3O2– + H2O <---> OH- + HC2H3O2
e. H2PO4- OH-<---> HPO4-2 + H2O
f. H2PO4- + H3O+ <---> H3PO4 + H2O
g. HCO3– + H2O <---> H3O+ + CO3-2
h. HCO3– + H2O <---> H2CO3 + OH-
The Bronsted-Lowry acid, base and the conjugate acid, and the conjugate base in each of the following reactions are mentioned below serially:
Bronsted-Lowry acid Bronsted-Lowry base
HNO₃ H₂O
H₂O NH₃
H₂SO₄ OH⁻
H₂O C₂H₃O₂⁻
H₂PO₄⁻ OH⁻
H₃O⁺ H₂PO₄⁻
HCO₃⁻ H₂O
H₂O HCO₃⁻
Conjugate acid: Conjugate base:
H₃O⁺ NO₃⁻
NH₄⁺ OH⁻
H₂O HSO₄⁻
HC₂H₃O₂⁻ OH⁻
H₂O HPO₄²⁻
H₃PO₄ H₂O
H₃O⁺ CO₃²⁻
H₂CO₃ OH⁻
What are Bronsted-Lowry acid and base?Bronsted-Lowry acids are substances that donate protons or H+ ions to other compounds to form conjugate bases. Bronsted-Lowry bases are substances that accept protons or H+ ions from other compounds to form conjugate acids.
For the given reactions:
a. HNO₃ + H₂O <---> H₃O⁺ + NO₃⁻
Bronsted-Lowry acid: HNO₃
Bronsted-Lowry base: H₂O
Conjugate acid: H₃O⁺
Conjugate base: NO₃⁻
b. NH₃ + H₂O <---> NH₄⁺ + OH⁻
Bronsted-Lowry acid: H₂O
Bronsted-Lowry base: NH₃
Conjugate acid: NH₄⁺
Conjugate base: OH⁻
c. H₂SO₄ + OH⁻ <---> HSO₄⁻ + H₂O
Bronsted-Lowry acid: H₂SO₄
Bronsted-Lowry base: OH⁻
Conjugate acid: H₂O
Conjugate base: HSO₄⁻
d. C₂H₃O₂⁻ + H₂O <---> OH⁻ + HC₂H₃O₂
Bronsted-Lowry acid: H₂O
Bronsted-Lowry base: C₂H₃O₂⁻
Conjugate acid: HC₂H₃O₂⁻
Conjugate base: OH⁻
e. H₂PO₄⁻ + OH⁻ <---> HPO₄²⁻ + H₂O
Bronsted-Lowry acid: H₂PO₄⁻
Bronsted-Lowry base: OH⁻
Conjugate acid: H₂O
Conjugate base: HPO₄²⁻
f. H₂PO₄⁻ + H₃O⁺ <---> H₃PO₄ + H₂O
Bronsted-Lowry acid: H₃O⁺
Bronsted-Lowry base: H₂PO₄⁻
Conjugate acid: H₃PO₄
Conjugate base: H₂O
g. HCO₃⁻ + H₂O <---> H₃O⁺ + CO₃²⁻
Bronsted-Lowry acid: HCO₃⁻
Bronsted-Lowry base: H₂O
Conjugate acid: H₃O⁺
Conjugate base: CO₃²⁻
h. HCO₃⁻ + H₂O <---> H₂CO₃ + OH⁻
Bronsted-Lowry acid: H₂O
Bronsted-Lowry base: HCO₃⁻
Conjugate acid: H₂CO₃
Conjugate base: OH⁻
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Which model of an atom accounted for the mass of the atom and a balanced charge
Answer: The Rutherford model.
Explanation:
diborane is a highly reactive oron hydraidw, which was once considered as a possible rocket fuel for the us space program. calculate the delta h for the symthesis of dibrone
The chemical compound diborane has the molecular formula B2H6 and is made up of boron and hydrogen atoms. Diborane is a highly reactive oron hydraidw, which was once a possible rocket fuel for the us space program
Boranes are the name given to compounds that contain both boron and hydrogen atoms. One of the most basic boron hydrides is diborane. Boron hydrides and air combine effectively to create explosive combinations. At normal temperature, this material will fire rapidly. Diborane also goes by the names boro ethane and diboron hexahydride.
At room temperature, pure diborane does not react with oxygen or air, but instead produces significant amounts of impure B2O3 and energy.
3O2 + B2H6 = 3O3 + 3H2O
H equals -2165 KJ mol-1.
Trimethyl Borate is produced when diborane and methyl alcohol combine.
6CH3OH + B2H6 = 2B(OCH3)3.
ΔH = -2165 KJ mol-1 – Diborane reacts with methyl alcohol to give trimethyl Borate. B2H6 + 6CH3OH → 2B (OCH3)3 + 6H2
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the following solutions are prepared by dissolving the requisite amount of solute in water to obtain the desired concentrations. rank the solutions according to their respective osmotic pressures in decreasing order assuming the complete dissociation of ionic compounds.
According to the given statement the complete dissociation of ionic compounds is C₆H₁₂O₆ < NaCl ≈ CH₃OH < MgCl₂.
What exactly is compound?A composite is a material created by the chemical fusion of two or more elements. Bonds and metallic bonding are two typical forms of bonds that hold components in a compound together. Any synthesis will always include each ingredient in a specific ratio.
Briefing:The formula for osmotic pressure (Π) is
Π = icRT
If T is constant,
Π = kic
C₆H₁₂O₆:
Π
= k × 1 × 1 = k
MgCl₂:
Π
= k × 3 × 1 = 3k
CH₃OH:
Π
= k × 1 × 2 = 2k
NaCl:
Π
= k × 2 × 1 = 2k
The order of osmotic pressures is
C₆H₁₂O₆ < NaCl ≈ CH₃OH < MgCl₂
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The complete question is -
The following solutions are prepared by dissolving the requisite amount of solute in water to obtain the desired concentrations. Rank the solutions according to their respective osmotic pressures in decreasing order assuming the complete dissociation of ionic compounds. Rank from highest to lowest osmotic pressure. To rank items as equivalent, overlap them. 1M C6H12O6, 1M MgCl2, 2M CH3OH, 1M NaCl
If magneium burn in oxygen, the ratio i 3 ma unit of oxygen to form 5 ma unit of magneium oxide. How many gram of oxygen are needed to react with 6 gram of magneium?
Answer: 4
Explanation:
During one cycle, the sodium-potassium pump binds and moves.
1 Na+ and 2 K+.
2 Na+ and 2 K+.
2 Na+ and 3 K+.
3 Na+ and 2 K+..
3 Na+ and 3 K+
The sodium potassium pump transports Na+ out of the cell and K+ into the cell.
What is sodium potassium pump?Many cell or plasma membranes contain the sodium-potassium pump. The pump, which is powered by ATP, moves sodium and potassium ions in opposite directions, each against its concentration gradient.In a cycle of conformational (shape) changes, the sodium-potassium pump transports sodium out of and potassium into the cell. Three sodium ions leave the cell during each cycle, while two potassium ions enter.The ion-potassium pump is maintained by the sodium–potassium adenosine triphosphates, an enzyme that can be found in the membrane of animal cells and uses ATP to change Na+ (sodium) and K+ (potassium) concentrations inside and outside the cell. In its process, the enzyme pumps three Na+ ions from the inside to the outside of the cell, and also pumps two K+ from the outside to the inside of the cell. Therefore, the correct answer is B. It pumps 3 Na+ ions out of the cell for every 2 K+ ions it pumps into the cell.To learn more about sodium potassium pump, visit:
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a student performs an experiment where gas is collected over water in an upside down graduated cylinder. if the atmospheric pressure is 739 mmhg and the level of water in the graduated cylinder is 12.5 cm higher than the level of the water exposed to the atmosphere, what is the total pressure of gases inside the graduated cylinder?
The level of water in the graduated cylinder is 12.5 cm higher than the level of the water exposed to the atmosphere, The total pressure of gases inside the graduated cylinder is 614 mmHg
given that :
The atmospheric pressure is 739 mmHg
The level of water in graduated cylinder = 12.5 cm = 125 mmHg
the expression for the pressure is given as :
P total = P atm - hρg
where , hρg = 125 mmHg
P atm = 739 mmHg
putting the values , we get :
P total = P atm - hρg
= 739 mmHg - 125 mmHg
= 614 mmHg
Thus, the total pressure inside the graduated cylinder is 614 mmHg.
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if your isolated product has succinimide present, what key feature should be present in the ir spectrum of your product?
If the product contain succinimide, its IR spectra should show aprominent peak at around 1700 cm-1, indicating an incomplete reaction.
What defines an element's spectrum?Because various elements have varying quantities of protons and varied numbers and configurations of electrons, they also have different spectra. The variations in spectra are a result of the energy that atoms absorb or emit as their electrons shift between different energy levels.
Is there a spectrum for every element?Every element generates an own collection of spectral lines. A line spectrum can be used to distinguish between different elements because no two produce the same spectral lines.
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Seeds are a derived character of the spermatophytes. All of the plants in this clade reproduce using seeds. However, embryo formation is also a trait of the spermatophytes. Do you think true water-conducting tissue is a derived character of either embryophytes or green algae? why or why not?.
Neither green algae nor embryophytes have a developed characteristic of having tissue that conducts water.
Embryophytes and aquatic "green algae" make up the majority of green plants.
Non-vascular plants lack the xylem and phloem that make up a vascular system.
Green algae are unable to grow as tall as the majority of vascular plants because they lack lignified water-conducting tissues.
What is xylem?
The vascular tissue is absent in green alge, which are divided into various unrelated families.
The majority of scientists believe that the xylem's real water conducting tissue is green. The tissue of the plant's vascula transports water and dissolved minerals from the roots to the rest of the plant while also offering structural support.
Tracheary elements are a general term for a variety of specialised water conducting cells found in xylem tissue.
Therefore, Green algae and embryophtes cannot be considered as both since they lack the xylem, a water-conducing tissue, and as a result cannot be both.
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Please help me I really need the extra credit
The potential energy is stored in magnet as it is moved away from the iron such that it does more work to attract it.
What is the potential energy?We know that the term potential energy has to do with an energy that a body does possess because it is found at a particular point. We can say that is the energy that is at a point.
We know that a magnet is a material that is able to pick up metals. Since the magnet can pick metals up, we say that the metals are magnetizable materials. Given the fact that iron is a metal it follows that iron is a magnetizable material.
The ability of the magnet to attract the iron depends on the distance of the iron from the magnet. Thus, the magnetic potential energy has a lot to do with the distance of the separtion between the magnet and the ion. The greater the distance between the iron and the magnet, the greater the work that is done by the magnet to attract the iron.
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Which of the following is part of the third step when using stoichiometry to go from grams of a reactant to grams of a product?
A) Mole ratio
B) Mass of product
C) Mass of reactant
D) Molar mass of reactant
The part of the third step when using stoichiometry to go from grams of a reactant to grams of a product is Mole ratio (option A).
What is stoichiometry?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
Stoichiometric problems involving reactants mass to products mass can be solved in four simple steps:
Balance the equation.Convert units of a given substance to moles.Using the mole ratio, calculate the moles of substance yielded by the reaction.Convert moles of wanted substance to desired units.This suggests that the third step when using stoichiometry to calculate grams of a reactant or grams of a product is to find the mole ratio.
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Answer:
To anyone who's wondering, the fourth step is
D. Molar mass of product
(I just took the test and got it right).
Explanation:
Mention how a halogen substituent can be replaced by a deuterium atom in the preparation of a deuterated compound
A halogen substituent can be replaced by a deuterium atom in the preparation of a deuterated compound :
CH₃CHBrCH₂CH₃ + Mg + ether ---> CH₃CHMgBrCH₂CH₃ + D₂O -->
CH₃CHDCH₂CH₃
In The reaction with the deuterium donor , the Grignard reagent converts into R- D . the grignard reagent react with proton donor to convert R - MgX to R-H. The grignard reagent the magnesium salt. the grignard reagent is an organometallic compound. the formula for the grignard reagent is RMgX.
CH₃CHBrCH₂CH₃ + Mg + ether ---> CH₃CHMgBrCH₂CH₃
CH₃CHMgBrCH₂CH₃ + D₂O --> CH₃CHDCH₂CH₃
Thus, the above reaction is the preparation of a deuterated compound.
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What is the concentration of ppmv of carbon monoxide with a concentration of 103.
8.999×10^-2 ppmv is the concentration of ppmv of CO.
How to calculate concentration of ppmv CO?Concentration is defined as amount of solute per amount of solution or solvent.
To convert from ppm by mass to ppm by volume, divide by the density of the particles.
Calculation:The conc of CO = 103 mg/m³
=0.103 mg/m³ air
Molecular weight if CO = 28g/mol
Moles of CO = 0.103×10^-3 g/28g/mol
= 3.678×10^-6 mol
Calculate the volume of CO as follows:
V=nRT/P
=3.678×10^-6 mol × 8.314 Pa m³/mol K × 298.15 / 101325 Pa
= 8.999×10^-8 m³ CO/m³ air
Convert units of V into pmv as follows
=8.999×10^-8 m³ CO/m³ air ×10^6
=8.999×10^-2 ppmv
Or 0.08999 ppmv
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Why is it important to conduct multiple trials of an investigation to determine the melting point of ice?(1 point).
It is important to conduct multiple trials of an investigation to determine the melting point of ice in order to ensure accuracy and to account for any small variations or errors that may occur.
What is investigation?
Finding the response to a question using a variety of research techniques is the process of conducting a scientific investigation. An investigation typically starts when a person observes their surroundings and poses questions they are unsure of the answers to. After that, they conduct additional observations or design an experiment to verify a theory. The researcher could indeed present findings that make an attempt to address their questions by gathering and analysing data. The experiment may be changed by the researcher to test for variables they hadn't originally thought of. A scientific investigation's primary goal is to advance knowledge. Researchers can discover explanations for natural phenomena through research and experimentation, and they can then use their discoveries to address issues in the real world.
Melting point is an important physical property of a substance and accurate measurements are necessary for many scientific experiments. Conducting multiple trials and averaging the results will help to reduce the impact of any errors and ensure the most accurate measurement of the melting point.
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Electrical Bonding Evidence Quick Check:
1. Melting point, boiling point, surface tension, and vapor pressure (D)
2. Deciding on the appropriate equipment (C)
3. Mix ice with water until equilibrium is reached but some ice remains that is no longer melting (B)
4. It ensures that results are accurate (A)
5. The student should take the average of the results from all four trials (D)
------------
These are all 100%! I just took the test and all my answers were correct! Hope this helps you <3
What is usually released in a combustion reaction?
Answer:
heat energy
Explanation:
I think because of the collisions of all the atoms/molecules that were accelerated because of the heat from the initial reaction and first collisions, heat is generated.
also, oxygen is added to the flame from the air as well :)
When 1711 J
of heat energy is added to 43.2 g
of hexane, C6H14,
the temperature increases by 17.5 ∘C.
Calculate the molar heat capacity of C6H14.
The molar heat capacity of ethanol is 107 J⋅°C-1mol-1.
What is Molar Heat Capacity?
The amount of heat required to raise the temperature of 1 mole of a substance by 1 unit is known as the molar heat capacity, which is calculated by dividing heat capacity by the total number of moles.
The quantity and size of the substance have an impact on heat capacity, a complex property. A modified notion known as specific heat capacity, or just specific heat, is commonly used in physics. Because it is unaffected by the quantity of the substance, specific heat is a more useful characteristic.
The term "specific heat" refers to the amount of energy required to increase a substance's mass by one unit of temperature. It can be calculated quantitatively as the heat capacity of a substance divided by its mass.
q = amount of heat transferred
n = number of moles
c = molar heat capacity
ΔT = change in temperature
q=ncΔT
The molar heat capacity of ethanol is 107 J⋅°C-1mol-1.
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Question 4 (4 points)
(02.07 MC)
Title: CHM-U4-4.08-Std3a-4
Read the given expression.
X = number of protons - number of core electrons
Which of the following explains the identity of X and its trends across a period? (5 points)
O a
Oc
X is the effective nuclear charge, and it remains constant across a period.
X is the screening constant, and it remains constant across a period.
X is the effective nuclear charge, and it increases across a period.
X is the screening constant, and it increases across a period.
Next Page
Back
The effective nuclear charge, denoted by the letter X, grows with period, and this is the right response to the question above.
Here, X stands for the effective nuclear charge. And it may be computed by deducting the number of core electrons from the amount of protons. The positive attraction that nuclear protons exert on valence electrons is known as the effective nuclear charge. Due to the shielding effect, the effective nuclear charge is always lower than the total amount of protons in a nucleus.
Despite the fact that nuclear charge rises as atomic number increases in both period and group. In a group and over a period, the effective nuclear charge exhibits opposing patterns. It increases along with period (due to increasing nuclear charge with no accompanying increase in shielding effect). And decreases in group (although nuclear charge increases down a group, shielding effect more than counters its effect).
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in blood plasma, ph is maintained by the carbonic acid-bicarbonate buffer system. how is ph maintained when acid or base is added to the buffer system?
The blood interacts with the bicarbonate, C03²-, from the acid to balance it when acid is supplied to the blood buffer system.
How does a buffer system operate and what does it mean?A buffer is a substance that can withstand a pH shift when acidic or basic substances are added. Small additions of acid or base can be neutralized by it, keeping the solution's pH level largely constant. For procedures and/or reactions that call for certain and stable pH ranges, this is significant.
Give an example of what a buffer system is.Buffer solutions can resist the pH change when a strong acid or base is added sparingly. A strong acid and also its salt can be used as a buffer. It is a mixture of sodium acetate and acetic acid, CH3COOH + CH3COONa.
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a30.0-g sample of water at 280.k is mixed with 50.0g of water at 330. k. calculate the final temperature of the mixture assuming no heat loss to the surroundings.
The mass and temperature of the first container are multiplied together, and the result is added to the product of the mass and temperature of the second container to get the water temperature of the combination.
After that, divide the result by the total water masses in each container.
What factors contribute to the calorimeter's heat capacity?The amount of heat that the calorimeter can hold for each degree Celsius increase in temperature is known as its heat capacity.
Experimental analysis is required to determine the calorimeter's heat capacity. Studying how warm and cold water are combined is the simplest technique.
Since we are aware that the final amount of our dilution will be 150mL.
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If 75. 0 ml of a 0. 20 m solution of sodium nitrate is mixed with 25. 0 ml of a 0. 10 m solution of barium nitrate, what is the molar concentration of nitrate ions in the resulting solution?.
The molar concentration of nitrate ions in the resulting solution is 0.20M.
What is molar concentration?Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
Now let us come to our problem statement;
Nitrate from NaNO₃:
75.0 mL × 0.20 M = 15 mmol NaNO₃ = 15 mmol NO₃⁻
Nitrate from Ba(NO₃)₂:
25.0 mL × 0.10 M = 2.5 mmol Ba(NO₃)₂
2.5 mmol Ba(NO₃)₂ × [tex]\frac{2mmol NO3}{1mmol Ba(NO3)2}[/tex] = 5.0 mmol NO₃⁻
So the final number of NO₃⁻ moles is (15 + 5) 20 mmol.
The final volume is (75 + 25) 100 mL.
So the molar concentration is:
20 mmol / 100 mL = 0.20 M
The molar concentration of nitrate ions in the resulting solution is 0.20M.
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to what volume should you dilute 30 ml of a 12 m h2so4 solution to obtain a 0.15 m h2so4 solution?
The volume will be 2400 ml.
The equation used here will be
M1 × V1 = M2 × V2
M1 = initial concentration
M2 = final concentration
V1 = initial volume
V2 = final volume
So according to the data;
M1 = 12m
M2 = 0.15m
V1 = 30ml
V2 = ?
By putting the values in the equation as follows;
M1 × V1 = M2 × V2
V2 = M1 × V1 / M2
By putting the values given in the question we will solve this question as follows
V2 = 12 × 30 / 0.15
V2 = 360 / 0.15
So the volume used will be;
V2 = 2400 ml
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The reaction between aluminum and an aqueous solution of copper (I) sulfate
is represented by the equation below.
2Al(s) + 3 CuSO+ (aq) - › Al2 (SO4)3 (aq) + 3 Cu(s)
How many atoms does 6 moles of Al(s) contain?
The number of atoms contained by 6 moles of aluminium is 3.612 × 10²⁴ atoms of Al.
How to calculate number of atoms?The number of atoms contained by a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number.
Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³. By definition, it is the number of elementary entities (atoms or molecules) comprising one mole of a given substance.
According to this question, a reaction occurs between aluminum and aqueous solution of copper (I) sulfate. If there are 6 moles of aluminium, the number of atoms in this aluminium can be calculated as follows:
no of atoms = 6 × 6.02 × 10²³
no of atoms = 36.12 × 10²³
no of atoms = 3.612 × 10²⁴ atoms of Al
Therefore, 3.612 × 10²⁴ atoms of Al is the number of atoms contained in 6 moles of aluminium.
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When a liquid becomes a solid, the atoms in the solid usually
Answer: When a liquid becomes a solid what happens to the atoms in the solid?
The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.
Explanation:
The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid. Where the Atoms vibrate but still stick together, not moving past, behind, etc of where they are.