A 68.0 mL portion of a 1.50 M solution is diluted to a total volume of 208 mL. A 104 mL portion of that solution is diluted by adding 161 mL of water. What is the final concentration? Assume the volumes are additive.
Taking into account the definition of dilution, after two dilutions the final concentration is 0.1923 M.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. This is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal concentrationIn this case, you know for the first dilution:
Ci= 1.50 MVi= 68 mLCf= ?Vf= 208 mLReplacing in the definition of dilution:
1.50 M× 68 mL= Cf× 208 mL
Solving:
(1.50 M× 68 mL)÷ 208 mL= Cf
0.49 M= Cf
Now, in a second dilution you take a sample of 104 mL of this diluted solution and add another 161 mL of water. The final volume of the solution will be
Vfinal= 104 mL + 161 mL= 265 mL
The concentration of the 104 mL sample is equal to the concentration of the first diluted solution, this is 0.49 M. Therefore, the concentration of the final solution will be:
0.49 M× 104 mL= Cf× 265 mL
Solving:
(0.49 M× 104 mL)÷ 265 mL= Cf
0.1923 M= Cf
In summary, the final concentration is 0.1923 M.
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In a 5.0 g sample of sodium chloride, 39.34% of the compound is sodium. What is the percent by mass of sodium in a 25 g sample of sodium chloride?
The percentage by mass of sodium in a 25 g sample of sodium chloride =39.92%
What is a chemical compound?A chemical compound is made up of two or more elements which are chemically combined together.
For example sodium chloride which contains sodium and chloride are chemically combined together to form sodium chloride as a chemical compound.
The first compound of sodium chloride= 5g
The percentage that is sodium= 39.34%
The second compound of sodium chloride= 25g
The percentage that is sodium= x%
That is = 5g = 39.34%
Therefore quality of sodium in grams;
= 39.34/100× 5
= 0.3934× 5
= 1.967g
Therefore if 5g of NaCl contains 1.967g of Na
25g of NaCl will contain xg
Make xg the subject of formula,
= 25×1.978/5
= 49.45/5
= 9.98g of sodium.
To conver 9.98g to %;
=9.98/25 × 100/1
= 0.3992×100/1
= 39.92% of sodium.
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acetone is a widely used industrial solvent, and the main component in
many fingernail polish removers. The chemical formula is CH3COCH3 (the three
carbons are connected to each other in a chain: C-C-C).
a. Draw the Lewis structure for acetone, and predict the geometry around
each carbon atom.
b. Is the molecule polar or non-polar?
c. What kinds of intermolecular forces exist between acetone molecules?
d. 1-propanol (CH3CH2CH2OH, again, all C atoms are connected in a long chain,
C-C-C-C) boils at 97.2 °C while acetone boils at 56.5 °C. Explain the
difference.
Kinds of intermolecular forces exist between acetone molecules is Hydrogen bond.
A. CH3 -C-CH3.
B. The molecular is nonpolar.
C. Dipole-dipole interactions.
D. CH3-CH₂-OH → 1-proposal if dissolves in water form the strong Hydrogen bonding Acetone with water when Compare with 1-prop and have more strong Hydrogen bonding due to its bending 1-propenal has more boiler point.
Molecules with oxygen atoms nitrogen atoms or ionizable groups -CO2H and -SO3H tend to be polar. A non-polar molecule is a molecule that does not have regions of positive and negative charge. Ethane is an example of a non-polar substance. A bond is considered nonpolar if the electronegativity difference is less than about 0.4.
When things are different at both ends we call them polar. Also, some molecules have positive and negative ends, and when they are present, we call them polar. Otherwise, it is called non-polar. Polar things can attract or repel each other. Opposite charges attract and charges repel.
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There are usually more objects at a crime scene than investigators can efficiently collect and analyze.
A.
True
B.
False
Answer:
A. True
Explanation:
What is the limiting reagent when 1.5 moles of nitrogen react with 6 moles of hydrogen? N2(g)+3H2(g)—> 2NH3(g)
Explanation
Given
N2(g)+3H2(g)—> 2NH3(g)
Number of moles of nitrogen = 1.5 moles
Number of moles of hydrogen = 6 moles
Required: Limiting reagent
Solution
For Nitrogen:
[tex]\begin{gathered} 1,5\text{ mol N x }\frac{2\text{ mol NH}_3}{1\text{ mol N}_2} \\ \\ Moles\text{ of NH}_3=3\text{ mol} \end{gathered}[/tex]For Hydrogen:
[tex]\begin{gathered} 6\text{ mol H x }\frac{2\text{ mol NH}_3}{3\text{ mol H}_2} \\ \\ Moles\text{ of NH}_3=\text{ 4 mol} \end{gathered}[/tex]The limiting reagent is Nitrogen, because less moles of NH3 will be produced by nitrogen, meaning it all of it gets used up.
Answer
The limiting reagent is Nitrogen.
How many moles of potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced? Can you show steps for answer
Moles of potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced is 28.63 mole
Potassium nitrate is an inorganic salt with a chemical formula of KNO₃ it is a natural source of nitrate and has been used as a constituent for several different purposes including food preservatives, fertilizers, tree stump removal, rocket propellants, and fireworks
Here given data is
4.4 moles of aluminum phosphate
We have to find moles of potassium nitrate =?
Number of mole = mass of substances/mass of one mole
Number of mole = 126/ 4.4 moles
Number of mole = 28.63mole
So, 28.63 mole potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced
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help me pls Thank you if you do
We can say that Javier is right because the reactivity of the elements tends to decrease from left to right.
What is the periodic table?The periodic table is an arrangement of the elements in order of increasing atomic number. Let us note that the modern periodic law states that the properties of the elements is a periodic function of their atomic numbers .Thus the atomic numbers of the elements tends to increase from left to right in the periodic table as we can see in the image that have been attached to the question above.
Now, we know that the reactivity of the elements also tend to decrease from left to right. This is because, the heavier the element, the less reactive that the element is. Recall that every period that we can find in the periodic table tends to end up with a non reactive noble gas element.
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How does the formation of an ionic bond differ from the formation of a covalent bond?
1) An ionic bond is where one atom transfers at least one electron from another atom in an attempt to fill its electron shell. A covalent bond is when electrons are shared
between atoms and there is equality between atoms in relation to their electrons.
2) Ionic bonds form by the transfer of electrons. Covalent bonds form by sharing
electrons. In ionic bonding, electrons are completely transferred from one atom to
another. In the process of either losing or gaining negatively charged electrons, the
reacting atoms form ions. Ions that have a positive charge are called cations and the
ones that have a negative charge are called anions. On the other hand, covalent bonds can be formed by any equal or unequal sharing of electrons. The substances formed by ionic bonds are called compounds and those formed by covalent bonds are referred to as molecules.
3) The formation of an ionic bond differs from the formation of a covalent bond by
being so, a covalent bond forms when one electron in the outer electron orbit of each
atom is shared between the two atoms. Covalent has only one electron to be shared
and ionic has more than one electron to be transferred.
(HELP IS NEEDED SOON. THANK U SO MUCH)
Covalent bonds and ionic bonds differ as follows: ionic bonds form by the transfer of electrons. Covalent bonds form by sharing electrons. In ionic bonding, electrons are completely transferred from one atom to
another. In the process of either losing or gaining negatively charged electrons, the
reacting atoms form ions. Ions that have a positive charge are called cations and the ones that have a negative charge are called anions. On the other hand, covalent bonds can be formed by any equal or unequal sharing of electrons. The substances formed by ionic bonds are called compounds and those formed by covalent bonds are referred to as molecules (option 2).
What are ionic bonds?Ionic bonds are a type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.
On the other hand, a covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.
Ionic bonds occur between metals, which lose electrons, and nonmetals, which gain electrons. Ions with opposite charges will attract one another creating an ionic bond.
Also, covalent bonds form when two atoms of similar charges share electron pairs.
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A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of 10.20,what is the concentration of methylamine chloride in the solution? Kb for methylamine=4.6*10^-4
Answer:
0.43 M
Explanation:
The equation that should be used in this case would be:
pOH = pKb + log([A+]/[Base])
pKb = -log (4.6*10^-4) = 3.34
pOH = 14-10.2 = 3.8
[Base] = 0.15
3.8 = 3.34 + log x/0.15
0.46=log x/0.15
10^(0.46) = x/.15
x = 10^(0.46) * 0.15 = 0.43 M
hello, can someone please help me with this problem
Answer:
chicken tenders and egg rolls and butter fingers
A certain gas is present in a 11.0 L cylinder at 2.0 atm pressure. If the pressure is increased to 4.0 atm , the volume of the gas decreases to 5.5 L . Find the two constants ki , the initial value of k , and kf , the final value of k , to verify whether the gas obeys Boyle’s law.
Express your answers to two significant figures separated by a comma.
A certain gas is present in a container obeys Boyles law.
What is Boyles law?The Boyles law stated that if the temperature and amount of gas remain constant within a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it fills.
Boyles law can be expressed as
P1V1 = P2V2
As per Boyles law P= k / V
So, Pi = ki / Vi
Ki = Pi Vi
= 2.0 x 11.0 = 22.0 atm-L
Thus for Kf
Kf = Pf Vf
= 4.0 x 5.5 = 22.0 atm-L
Thus Ki = Kf
This signify that it obeys Boyles law.
Thus, a certain gas is present in a container obeys Boyles law.
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If the chemical reaction AB + CD to AD + BC releases heat, what is true of the stored bond energy of the reactants and products?
The bonds do not have energy, the atoms release heat.
change: unmarried alternative AB + C → AC + B
exchange: Double alternative AB + CD → ad + CB
mixture (Synthesis) A + B → AB
Decomposition AB → A + B
A chemical reaction is a method that ends in the chemical transformation of one set of chemical substances to some other.
A procedure that includes rearrangement of the molecular or ionic shape of a substance, in preference to a exchange in bodily form or a nuclear reaction.
A chemical response is a technique in reactants react chemically and convert into products via chemical transformation. as an example, breathing – we inhale oxygen which reacts with glucose and produces carbon dioxide, water and strength. The response is given below. C6H12O6 + 6O2 → 6CO2 + 6H2O + power.
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29. How many protons, neutrons, and electrons does 35/17C1¹+ have?
Answer:
proton= 17
neutron=18
electron=16
materials used to make textile
Answer:
Animal wool (e.g., wool, silk)plant (e.g., cotton, flax, jute)mineral (e.g., asbestos, glass fibre)synthetic (e. g., nylon, polyester, acrylic)Explanation:
Many materials can be used in making textiles. The materials are mainly from animal, plant, mineral and synthetic sources. The examples are as follows;
Animal wool (e.g., wool, silk)plant (e.g., cotton, flax, jute)mineral (e.g., asbestos, glass fibre)synthetic (e. g., nylon, polyester, acrylic)The combustion of propane may be described by the chemical equation
C₂Hg (g) + 5O₂(g) → 3 CO₂(g) + 4H₂O(g)
-
How many grams of O₂(g) are needed to completely burn 27.6 g C3H₂(g)?
Water has a molar mass of 18 g/mol while propane has a molar mass of 44 g/mol.
As a result, 44.0 g (1 mole) of propane will burn in order to produce 4 moles of water.
Mass of water obtained =4×18=72.0 g.
What kind of reaction is propane combustion?Propane undergoes burning with hydrocarbons to release its chemical energy. An animation of hydrocarbon combustion is shown here to demonstrate the overall process that happens when oxygen and propane mix. One instance of an exothermic process is the hydrocarbon combustion reaction, which produces heat energy.
A fuel and an oxidant, often atmospheric oxygen, engage in a high-temperature exothermic (heat-releasing) redox (oxygen-adding) chemical reaction during combustion that results in oxidised, frequently gaseous products in a mixture known as smoke.
The balanced chemical equation for the total combustion of propane states .
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An object’s displacement is the distance and _____________ of the object’s change in position.
An object’s displacement is the distance and direction of the object’s change in position.
What is displacement?Displacement in physics is the quantity which denotes distance with a directional component.
Displacement and distance are two inter-related terminologies that are often misused, however, they differ being that displacement is a vector quantity while distance is a scalar quantity.
This means that displacement has direction and magnitude, hence, can be defined as the distance and direction of an object’s change in position.
Displacement is denoted by ∆x and is calculated by dividing the change in position by time taken.
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i need help with chemistry equation
The maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.
The formula for the the limiting reagent is H₂
The amount of excess reagent that remains after the reaction is 3.86 g.
What is limiting reagent?The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
The limiting reagent is determined by balancing the chemical equation as follows;
H₂ + C₂H₄ --------> C₂H₆
From the reaction above;
1 mole of hydrogen gas = 1 mole of ethylene = 1 mole of ethane
2 g of hydrogen gas (H₂) = 30 g of ethane (C₂H₆)
0.61 g of H₂ = ? of C₂H₆
= (0.61 x 30)/2
= 9.15 g of C₂H₆
Thus, the maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.
The formula for the the limiting reagent is H₂ because it will be completely used up.
2 g of H₂ = 28 g of C₂H₄ -
0.61 of H₂ = ?
= (0.61 x 28)/2
= 8.54 g
Excess mass of the ethylene that remains = 12.4 g - 8.54 g = 3.86 g
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Which of the following factors can affect the solubility of a substance? Select all that apply.
The following factors can affect the solubility of a substance is temperature and pressure
Solubility is the maximum amount of substances that will dissolve in a given amount of solvent at specific temperature and solubility is the characteristics property of specific solute and solvent combination and different substances has greatly different solubility's and there are two direct factor that affect the solubility and they are temperature and pressure and temperature affect solubility of both solid and gases but pressure only affect the solubility of gases
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Which of the following accounts for the differences among the various amino acids
a. the amine group
b. the side chain
c. the acid group
d. a and b
e. b and c
The group that accounts for the difference among the various amino acids is the side chain (option B).
What are amino acids?Amino acids are any chemical molecule that has both an amino and a carboxylic acid functional group.
The antecedents or building blocks of protein molecules are known as amino acids. Ingredients that make up amino acids include:
Amino group (-NH2)Carboxyl group (-COOH)R-groupThe R group, a particular side chain, is also joined to the carbon in each of the 20 amino acids. The shapes, sizes and charges of the R groups vary. As a result, amino acids can be categorized based on the characteristics of their side chains.
All amino acids have the same amino and carboxyl groups; the R group, however, differs for each amino acid.
In nature, there are 20 different amino acids, each of which has an amino and carboxyl group. However, what sets them apart from one another is that they each have a unique R (side) chain.
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An ionic compound has the formula X3N2. Which one of the following groups is the element X on?
The element X in the ionic compound from the question belongs to group 2.
What is the ionic compound?An ionic compound is a compound that is formed when there is a combination of two or more atoms that are combined by the transfer of electrons. Now we know that the transfer of the electrons would give rise to the formation of to ions, a cation and an anion. The cation is the specie that lost electrons while the anion is the specie that gained the electrons. Thus the compound is composed actually of an ions pair that are necessarily of opposite charges from each other.
In this case, an ionic compound has the formula[tex]X_{3} N_{2}[/tex]. We can see that the element X has reacted with nitrogen to form a nitride and that the nitrogen has a subscript of 2 as shown.
The fact the nitrogen has a subscript of 2 shows that the element belongs to group 2.
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Convert
7.4 x 10e28 cg/L to Mg/mL
The unit of the density of the substance from cg/L to mg/mL is 7.4 x 10²⁶ mg/mL.
What is unit conversion?
Unit conversion is a method or a way of converting a given quantity from one unit to another.
The density of a substance can be measured in different units as shown blow;
kg/m³g/cm³cg/Lmg/ml, etcThe density of the substance can be converted to the required unit as shown below.
7.4 x 10²⁸ cg/L to mg/ml
= (7.4 x 10²⁸ cg/L) x (10 mg/cg) x (1 L / 1000 mL)
= 7.4 x 10²⁶ mg/mL
Thus, the unit of the density can be converted from centigram per liter to milligram per milliliter.
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What mass of Mg will be produced when 126.9 g of K are reacted?
The balanced reaction is MgCl2 + 2K --> 2KCl + Mg
Will Argon, Neon, and Krypton react the same or differently? Explain.
Will Argon, Neon, and Krypton react same
Noble gases only helium and neon are truly inert and the other noble gases will react on a limited scale under very specific conditions and krypton will form a solid with fluorine, and xenon will form a variety of compounds with oxygen and fluorine and the name comes from the fact that these elements are virtually unreactive towards other elements or compounds and they do not react with other element
Neon is a colorless, odorless, unreactive gas and argon is a colorless, odorless, unreactive gas and krypton is a colorless, odorless, unreactive gas
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Between Ar and H2O ( vapor) which gas deviates from ideal behavior and why? Justify your answer
Answer:
H2O
Explanation:
H2O should deviate from ideal behavior the most. Remember that an ideal gas has molecules which don't interact. Argon exists as an monoatomic element in the gas state, and the atom is neutral throughout. This means that two argon atoms only interact with each other through London dispersion forces or bumping. However, water is polar, so water molecules will attract each other strongly through permanent dipole-dipole interactions and hydrogen bonding. This means that water vapor deviates from ideal behavior the most
Condensation is a chemical reaction of _______. It represents _______ producing ______.
Decomposition
Synthesis
One organic molecule and a water molecule
Two organic molecules
One organic molecule
A water molecule
Exchange
Condensation is a chemical reaction of synthesis and represents two organic molecules producing one organic molecule.
What is condensation reaction?Condensation reaction is a reaction of two substances with the simultaneous loss of water or other small molecule.
Condensation reaction is a chemical reaction that synthesizes larger molecules from two or more smaller molecules with the release of water.
An example of condensation reaction is the synthesis of dipeptide (protein) from amino acids building blocks.
Therefore, it can be said that condensation synthesizes larger organic molecules from two smaller ones.
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Which of the following is TRUE if ΔEsys = -100 J?
The statement that is true if the ΔEsys = -100 J is that the system looses 100J of energy which is gained by the surroundings.
What is the energy of the system?Note that the study of energy is what we call thermodynamics. We should note that according to the laws of thermodynamics, energy can not be created nor destroyed but can be converted from one form to another.
This implies that the energy that is lost by the system must be gained by the surroundings since there can never be energy that goes to waste in the system.
Recall that the universe is composed of the system and the surroundings and the energy that is lost by the system must be gained by the surroundings and vice versa. This would now be our guide in deciding which statement is right above from what we have in the question here.
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How many moles of HCl are produced when 9.86 g of SOCl2 reacts? The balanced equation is:
SOCl2(ℓ)+H2O(ℓ)→SO2(g)+2HCl(g)
what is the formula for strontium chlorate
Identify the unknown elements from part C using the periodic table. Look for trends in the properties of the elements in each group. Use your answers from part C to guide you
The unknown elements based on their physical properties are as follows:
Element 1 is Krypton
Element 2 is Strontium
Element 3 is Lead
Element 4 is Bromine
Element 6 is Francium
What are some of the physical properties of elements used to identify them?Some of the physical properties of elements used to identify the elements include:
Physical state: may be solid, liquid, or gasConductivity: may be a good or poor conductorSolubility in water: may be soluble, insoluble, or fairly soluble Melting point: may be high or low.Considering the properties of the given elements from the periodic table:
Element 1 = Krypton
State of matter: gasConductivity: very poorSolubility (H₂O): noneMelting point: -157°CElement 2 = Strontium
State of matter: solidConductivity: goodSolubility (H₂O): reacts rapidlyMelting point: 777°CElement 3 = Lead
State of matter: solidConductivity: poorSolubility (H₂O): noneMelting point: 327°CElement 4 = Bromine
State of matter: liquid Conductivity: very poorSolubility (H₂O): negligibleMelting point: -7°CElement 5 = Copper
State of matter: solidConductivity: excellentSolubility (H₂O): noneMelting point: 1085°CElement 6 = Francium
State of matter: solidConductivity: goodSolubility (H₂O): reacts violentlyMelting point: 29°CLearn more about elements at: https://brainly.com/question/6258301
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How many grams are in 105.4 mol of nickel
Answer:
6186.98
Explanation:
105.4 mol of nickel is 6186.98 nickel