Moles of OH- ions added = 0.25 M * 0.02400 L = 0.006 moles, Moles of H+ ions added = 0.10 M * 0.02400 L = 0.0024 moles
To calculate the moles of OH- ions added, you can use the equation:
Moles = Concentration * Volume
(i) Moles of OH- ions added:
Concentration of NaOH solution = 0.25 M
Volume of NaOH solution = 24.00 ml = 0.02400 L
Moles of OH- ions added = 0.25 M * 0.02400 L = 0.006 moles
(ii) Since HCl is a strong acid, it dissociates completely in water to form H+ ions. Therefore, the moles of H+ ions added will be equal to the moles of HCl used.
Concentration of HCl solution = 0.10 M
Volume of HCl solution = 24.00 ml = 0.02400 L
Moles of H+ ions added = 0.10 M * 0.02400 L = 0.0024 moles
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Complete question: g 24.00 ml of a 0.25 m naoh solution is titrated with 24.00 ml of 0.10m hcl. (i) calculate the moles of oh- ion added. (ii) calculate the moles of h ions added. What is the concentration of HCl in the original solution before the titration?
A(n) _____ may be defined as a compound which contributes hydroxide ions or increases the OH- concentration when dissolved in water.
salt
base
ester
acid
Answer:
Base
Explanation:
Bases on dissolving with water release hydroxide ions
Take a example of Sodium hydroxide
NaOH+H_2O-->Na_0+OH-Q-3 Determine the fugacity in atm for pure ethane at 310 K and 20.4 atm and change in the chemical potential between this state and a second state od ethane where temperature is constant but pressure is 24 atm.
The fugacity in atm for pure ethane at 310 K and 20.4 atm is given by the equation: f = 20.4 exp (-Δg1/RT). The change in chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm is -0.0911RT.
Fugacity is a measure of the escaping tendency of a component in a mixture, which is defined as the pressure that the component would have if it obeyed ideal gas laws. It is used as a correction factor in the calculation of equilibrium constants and thermodynamic properties such as chemical potential. Here we need to determine the fugacity in atm for pure ethane at 310 K and 20.4 atm and the change in the chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm. So, using the formula of fugacity: f = P.exp(Δu/RT) Where P is the pressure of the system, R is the gas constant, T is the temperature of the system, Δu is the change in chemical potential of the system. Δu = RT ln (f / P)The chemical potential at the initial state can be calculated using the ideal gas equation as: PV = nRT
=> P
= nRT/V
=> 20.4 atm
= nRT/V
=> n/V
= 20.4/RT The chemical potential of the system at the initial state is:
Δu1 = RT ln (f/P)
= RT ln (f/20.4) Also, we know that for a pure substance,
Δu = Δg. So,
Δg1 = Δu1 The change in pressure is 24 atm – 20.4 atm
= 3.6 atm At the second state, the pressure is 24 atm.
Using the ideal gas equation, n/V = 24/RT The chemical potential of the system at the second state is: Δu2 = RT ln (f/24) = RT ln (f/24) The change in chemical potential is Δu2 – Δu1 The change in chemical potential is
Δu2 – Δu1 = RT ln (f/24) – RT ln (f/20.4)
= RT ln [(f/24)/(f/20.4)]
= RT ln (20.4/24)
= - 0.0911 RT Therefore, the fugacity in atm for pure ethane at 310 K and 20.4 atm is:
f = P.exp(Δu/RT)
=> f
= 20.4 exp (-Δu1/RT)
=> f
= 20.4 exp (-Δg1/RT) And, the change in the chemical potential between this state and a second state of ethane where the temperature is constant but pressure is 24 atm is -0.0911RT. Therefore, the fugacity in atm for pure ethane at 310 K and 20.4 atm is given by the equation: f = 20.4 exp (-Δg1/RT). The change in chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm is -0.0911RT.
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why is the air along a coastline typically cooler than in other areas?
Answer:
ocean heats up and cools down relatively slowly. Therefore, areas near the ocean generally stay cooler
Mikayla says that air is an element since it has oxygen in it. Jose says that air is a mixture because each part of air keeps its properties. Grant says that both Mikayla and Jose are wrong, because air is a compound. Who is correct and why? Group of answer choices
Answer: Jose is correct because air is a mixture of gases ( both elements and compounds).
Explanation:
An element consist of only one type of atom and a compound made up of 2 or more types of elements joined together ( by ionic or covalent bonds).
Whereas air around us is a mixture of gases (both elements and compounds) like nitrogen, oxygen, argon, and carbon dioxide, and very small amounts of other gases and water vapors
Hence, Jose is correct because air is a mixture of gases ( both elements and compounds).
All of the following are true about the bonding of methane, CH4, EXCEPT: the compound has tetrahedral geometry these sp3 orbitals combine with the s orbitals of the hydrogens to form molecular orbitals some of the C-H bonds are stronger than others the carbon s and p orbitals combine to form four equivalent sp3 orbitals all of the C-H bonds are equivalent
The statement "some of the C-H bonds are stronger than others" is not true about the bonding of methane (CH₄).
In methane, all the C-H bonds are equivalent. Each hydrogen atom forms a single covalent bond with the carbon atom, and all of these bonds have the same strength and length.
The four hydrogen atoms are symmetrically arranged around the central carbon atom, resulting in a tetrahedral geometry for the molecule.
Methane adopts a tetrahedral geometry, with the carbon atom at the center and the four hydrogen atoms arranged symmetrically around it.
In the formation of methane, the carbon atom's three 2p orbitals and the 2s orbital hybridize to form four equivalent sp3 hybrid orbitals.
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2. Bubbles were observed when peroxide was added to liver. What were the bubbles made of? ________
Answer:
Catalase
Explanation:
A damaged enzyme may no longer work to catalyze a chemical reaction. Catalase is an enzyme in the liver that breaks down harmful hydrogen peroxide into oxygen and water. When this reaction occurs, oxygen gas bubbles escape and create foam.
Please help me answer these true or false chemistry questions!! 33 points!!
1) Galium's (Ga) electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1 = TRUE OR FALSE
2) Galium has two valence electrons = TRUE OR FALSE
3) Iridium electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d7 = TRUE OR FALSE
4) Iridium (Ir) has two valence electrons = TRUE OR FALSE
5) Oxygen's orbital notation is 1sX 2sX 2pX// = TRUE OR FALSE
6) Scandium's (Sc) orbital notation is 1s2 2s2 = TRUE OR FALSE
7) Carbon (C) noble gas abbreviation is [Rn] 7s2 = TRUE OR FALSE
8) Neon's (Ne) noble gas abbreviation is [Xe] 6s2 4f6 = TRUE OR FALSE
9) Lithium's noble gas abbreviation is [He] 2s1 = TRUE OR FALSE
10) The long form electron configuration of Iodine ion with a -1 charge (I^-1) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 = TRUE OR FALSE
11) Iodine ion with -1 charge is isoelectronic with Neon = TRUE OR FALSE
12) Calcium ion with +2 charge's (Ca^+2) electron configuration is 1s2 2s2 2p6 3s2 3p6 = TRUE OR FALSE
13) Calcium ion with +2 charge is isoelectronic with Argon (Ar) = TRUE OR FALSE
14) Helium's Electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 = TRUE OR FALSE
15) Helium is isoelectronic with Xenon (Xe) = TRUE OR FALSE
16) The neutral 1s2 2s2 2p6 3s2 3p5 atom is Cl = TRUE OR FALSE
17) The atom with the -1 charge and the electron configuration 1s2 2s2 2p6 3s2 3p6 is Cl-1 = TRUE OR FALSE
18) The atom with the -3 charge and the electron configuration of 1s2 2s2 2p6 3s2 3p6 is P^-3 = TRUE OR FALSE
19) The quantum number for Chlorine ion with -1 charge is (3, 1, +1, -1/2) = TRUE OR FALSE
Thanks to anyone that answers!!
Answer: 1) True
2) False 4)False 5)True
Explanation: I took a test that had similar questions
Solve for the Gradient AB. The units will be in m/km but you should not
leave units in the answer because the answer key will not take them. Write
the answer to the tenths place and no units.
.X
B
Lake
-100
Blue River
50
А
D
5 kilometers
Contour interval 10 meters
N
0
2
3
5 kilometers
Answer:
help me mark me as a brinliest
What is an example of a solid turning into another state of matter?
Answer:
Explanation:
Let me start with a simple one:
An ice cube ( solid ) changing into water ( a liquid )
Another example:
Dry ice ( solid ) submiling.
HOPE IT HELPES
What's the molality of a solution with 120 g of NaCl and 30 kg of water?
A)
0.068
B)
0.004
C)
0.25
D)
6.8
Answer: The correct option is A) 0.068 m
Explanation:
Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molarity:
\(\text{Molality of solution}=\frac{\text{Given mass of solute}}{\text{Molar mass of solute}\times \text{Mass of solvent (in kg)}}\) .....(1)
We are given:
Given mass of NaCl = 120 g
Molar mass of NaCl = 58.45 g/mol
Mass of solvent = 30 kg
Putting values in equation 1, we get:
\(\text{Molality of NaCl}=\frac{120}{58.44\times 30}\\\\\text{Molality of NaCl}=0.068m\)
Hence, the correct option is A) 0.068 m
will magnesium and fluorine atoms most likely form an ionic bond or a covalent bond? 15px
Magnesium and fluorine atoms will most likely form an ionic bond.
Ionic bonds are formed between elements with a large difference in electronegativity, which is the measure of an atom's ability to attract electrons towards itself. Magnesium and fluorine have a difference in electronegativity of 2.13, which is large enough to form an ionic bond.
In ionic bonds, one atom loses electrons and becomes a positively charged ion (cation), while the other atom gains electrons and becomes a negatively charged ion (anion). In this case, magnesium will lose two electrons to become Mg2+ and fluorine will gain one electron to become F-. These two ions will then attract each other electrostatically to form magnesium fluoride (MgF2), which is an ionic compound.
On the other hand, covalent bonds are formed between elements with a small difference in electronegativity, where atoms share electrons to achieve a stable electron configuration. Magnesium and fluorine have a large electronegativity difference, so they are unlikely to share electrons and form a covalent bond. Therefore, magnesium and fluorine will most likely form an ionic bond.
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which description applies to all atoms of an element?
All atoms of an element have the same number of protons in their nucleus, which is known as the atomic number.
Additionally, they have the same chemical properties and react in similar ways due to their identical electron configurations. Each element also has a unique symbol and name assigned to it, allowing it to be easily distinguished from other elements.
The physical and chemical properties of an element can be predicted based on its position in the periodic table, which is organized by increasing atomic number. All isotopes of an element also have the same number of protons, but may vary in the number of neutrons and thus have different atomic masses. Overall, these characteristics apply to all atoms of an element in a consistent and predictable manner.
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4. How much energy will it take to raise the temperature of 75.0 g of water from 20.0 °C to 55.0 °C?
Specific heat of water = 4.184 J/(g°C)
A. 63 J
B. 630 J
C. 2630 J
D. 1.1 x 10¹ J
Answer:
1.1 x 10⁴ J
Explanation:
To calculate eth energy needed, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy/heat (J)
-----> m = mass (g)
-----> c = specific heat (4.184 J/g°C)
-----> ΔT = change in temperature (°C)
You can plug the given values into the equation and solve.
Q = mcΔT
Q = (75.0 g)(4.184 J/g°C)(55.0 °C - 20.0 °C)
Q = (75.0 g)(4.184 J/g°C)(35.0)
Q = 11,000 J
Q = 1.1 x 10⁴ J
Help! Can somebody explain the answer and how they got it?
"Write the equation for the first ionization of potassium."
Answer:
K°(g)* + 419 Kj/mole => K⁺(g) + e⁻
Explanation:
1st ionization step for potassium is the ionization of the 4s¹ electron. This requires 419 Kj/mole energy (endothermic). The reaction equation is ...
K°(g)* + 419 Kj/mole => K⁺(g) + e⁻
*note: Ionization of group IA metals requires they be in gas phase. That is, as shown by the Born-Haber Cycle** for formation of ionic compounds ...
K°(s) + 89.24 Kj/mole => K°(g); then ...
K°(g) + 419 Kj/mole => K⁺(g).
**Recommend review of Born-Haber cycle for formation of ionic compounds.
A gray whale can travelan average of 120
km per day as it migrates.
Explanation:
False, gray whales average 75 miles per day at a speed of 5 mph and is the longest annual migration of any mammal.
Answer:
That would be speed.
Explanation:
Who was the first person to introduce the concept of atomic mass?
how many electrons do noble gases have in their outer most level?
Noble gases have 8 electrons in their outermost level, except for helium, which has only 2 electrons.
Noble gases belong to Group 18 (VIII-A) of the periodic table, also known as the noble gas group or the Group 0 elements. The noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
In the outermost energy level of an atom, there is a maximum number of electrons that can be accommodated. The first energy level can hold up to 2 electrons, while the second and subsequent energy levels can hold up to 8 electrons each.
For noble gases, their outermost energy level is filled with electrons, giving them a stable electron configuration. The outermost level of noble gases is known as the valence shell, and it contains either 2 electrons (in the case of helium) or 8 electrons (for the other noble gases).
Helium (He) is an exception among the noble gases, as it has only 2 electrons in its outermost level (the first energy level). This is because the first energy level can hold a maximum of 2 electrons.
The remaining noble gases (Ne, Ar, Kr, Xe, Rn) have 8 electrons in their outermost level. This is because the second and subsequent energy levels can hold up to 8 electrons, providing a full complement of electrons for these elements.
The stable electron configuration of noble gases is a result of achieving an electron arrangement similar to that of a noble gas and is considered a stable and energetically favorable state.
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HELPPPP!!! I need the CORRRECT answer
1.Which pair of properties describes the elements in Group 18?
a) They are gasseous at room tempature and chemically stable
b) they have 8 valence electrons and are stable
c) they are chemically stable and liquid at room tempature
d) they are magnetic and boil at room tempature
Answer: c
Explanation:
Working from the sun outwards, which planet is the first to have at least one moon?
Earth
Venus
Mars
Mercury
Sun is the centre of the solar system containing 8 planets. Some planets have moons revolving around them. The planet from the sun which a moon is Earth.
What are planets?Planets are spatial objects formed by gases, soil, and dust and are having a gravitational force. The only living planet is earth. The moon of earth is itself called moon which is revolving around the earth.
In solar system the nearest planet to sun is mercury which have no moons. Next is venus also having no moons. The next planet in the series is earth having one moon.
After earth, mars is closest to sun which have two moons namely Deimos and Phobos. After mars,Jupiter having the highest number of moons and then saturn.
Therefore, the first planet from sun having at least one moon is earth.
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Answer:
Explanation:
Answer:,,,,,
What is the physical state of nitrogen at -200c
What is the distance between two spheres, each with a charge of 2.4×10^-6 C, when the force between them in 0.50 N?
Answer: Use the formula F= k q1q2/r^2 where k= 1/4π€ and it's value in air is 9× 10^9.
q1=q2= 2.4×10^-6C
F= 0.5N
You will get the value of r^2 and then will have to find the squre root of that value.
Explanation:
4.16 Unit Test: Chemical Bonding - Part 2 1. You are studying alkaline earth metals bonding with Halogens. Using your knowledge of the ionic bonding, what specific and testable scientific question could be asked about the salt formation
A testable scientific question could be asked about the salt formation is; "Is the salt soluble in water?
A scientific question is a question that can be answered by experiments. In other words, a scientific question must be empirical. Its answer can only be obtained by carrying out experiments.
In the case of bonding in alkaline earth metals, the kind of bond formed is ionic. Ionic compounds are soluble in water. Hence, a testable scientific question could be asked about the salt formation is; "Is the salt soluble in water?
This can be answered by dissolving several salts of alkali earth metals in water.
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What substance is produced when an active metal reacts with water? Ex. Na(s) + H2O(l) →_________
When an active metal reacts with water, the substance produced is hydrogen gas (H2) and an alkaline solution of the metal hydroxide. So the balanced chemical equation for the reaction between sodium (Na) and water (H2O) would be:
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
The most active metals in the activity series are lithium, sodium, rubidium, potassium, cesium, calcium, strontium and barium. These elements belong to groups IA and IIA of the periodic table.
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what type of interaction could occur between the side chains of two cysteine residues
The interaction could occur between the side chains of two cysteine residues is creation of disulfide covalent bonds.
When two cysteine residues come close to each other, the sulfhydryl (SH) groups on their side chains can undergo an oxidation reaction, resulting in the formation of a covalent bond called a disulfide bond (S-S bond).
The reaction involves the oxidation of the sulfhydryl groups (-SH) to form a disulfide bond (-S-S-) and the release of two protons (H⁺). This process is also known as disulfide bridge formation or disulfide bond formation.
The two sulfur atoms from the cysteine residues combine to form a covalent bond (disulfide bond), linking the two cysteine residues together. The resulting structure is commonly referred to as a cystine residue.
Disulfide bonds are important in the folding and stabilization of many proteins, as they can form within the polypeptide chain or between different chains in multi-subunit proteins. These bonds contribute to the protein's tertiary and quaternary structure, providing stability and influencing its overall conformation and function.
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Build Carbon (6 red protons, 6 grey neutrons, 6 blue electrons) How many
neutrons could an isotope of carbon have?
A. 5
B. 6
C. 7
Answer:
B. 6
Explanation:
Isotope given:
¹⁴₆C
In specie written as this;
Superscript = Mass number
Subscript = Atomic number
To find the protons, it is the same as the atomic number;
Protons = Atomic number = 6
Neutrons have no charges;
Neutrons = Mass number - Atomic number =
Neutrons = 14 - 6 = 8
The number of electrons is the same as the atomic number = 6
What measuring tool would you use to measure the area of a
football field? Taking into account the tool you just chose, to what
decimal place would you record your answer? (make up some
numbers that represent the dimensions of the field and use them to
explain your answer)
Measuring tool would you use to measure the area of a football field is used a tender wheel
If you need to measure much longer lengths for example the length of a football pitch then you could use a trundle wheel then you use it by pushing the wheel along the ground and it clicks every time it measures one meter and to measure the football field area then
Area = length×breadth
Area = 90m×45m
Area = 4.05m²
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based on the data table, which unknown solution could be 0.1 m naoh
Answer:
Where is the data table?
calculate the phph of a 0.566 m0.566 m solution of . the aka for the weak acid hfhf is 6.8×10−4.
The pH of the 0.566 M solution of HF, with a Ka of 6.8×10^(-4), is approximately 3.17.
Given that the concentration of the weak acid HF is 0.566 M, we can assume that the concentration of the conjugate base F⁻ is negligible compared to HF due to the low Ka value.
Using the pKa value of 6.8×10^(-4), we can calculate the pH:
pH = -log(6.8×10^(-4)) + log([F⁻]/[HF])
Since the concentration of F⁻ is negligible compared to HF, we can ignore it in the equation:
pH ≈ -log(6.8×10^(-4))
Calculating the logarithm:
pH ≈ -(-3.17) = 3.17
Therefore, the pH of the 0.566 M solution of HF, with a Ka of 6.8×10^(-4), is approximately 3.17.
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The half-life of a certain chemical in the human body for a healthy adult is approximately 6 hr. a)What is the exponential decay rate b How long will it take 94% of the chemical consumed to leave the body? aThe decay rate of the chemical is% (Round to one decimal place as needed.) bIt will takehr. (Round to one decimal place as needed.)
The exponential decay rate for healthy human body is 0.1155 and the time taken by 94% of the chemical consumed by the body to leave is 11.5 hours.
a) The exponential decay rate, often denoted as λ (lambda), can be calculated using the formula:
\(\lambda = \dfrac{ ln(2)} {t^{\frac{1}{2}}}\)
where ln represents the natural logarithm and \(t^\frac{1}{2}\) is the half-life of the chemical.
Substituting the given half-life value:
λ = ln(2) / 6
Using a calculator, we find:
λ ≈ 0.1155
So, the exponential decay rate is approximately 0.1155.
b) To calculate the time it takes for 94% of the chemical to leave the body, we can use the formula for exponential decay:
\(N(t) = N_{o} \times e^{-\lambda t}\)
where N(t) is the amount of chemical remaining at time t, N₀ is the initial amount of chemical, λ is the decay rate, and t is the time elapsed.
We want to find the time at which N(t) is 94% of N₀, which means:
0.94N₀ = N₀ \(\times e^{-\lambda t}\)
Cancelling out N₀:
0.94 = \(e^{-\lambda t}\)
Taking the natural logarithm of both sides:
ln(0.94) = -λt
Substituting the value of λ we found earlier:
ln(0.94) = -0.1155t
Now, solving for t:
t = ln(0.94) / -0.1155
solving the above equation, we get:
t ≈ 11.46
Therefore, the exponential decay rate for healthy human body is 0.1155 and it will take approximately 11.5 hours for 94% of the chemical consumed to leave the body.
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Complete question: The half-life of a certain chemical in the human body for a healthy adult is approximately 6 hr. a)What is the exponential decay rate b How long will it take 94% of the chemical consumed to leave the body?
what do the coefficients in a balanced equation tell us? mark all that apply. group of answer choices the relative volume of each substance involved in a reaction. the number of molecules of reactants and products involved in a chemical reaction. the relative number of moles of each substance involved in a chemical reaction. the relationships between the masses of the reactants and/or products in a reaction.
The coefficient in an equation for a chemical reaction that is balanced reveals some details about the chemical process.
What is balanced chemical reaction?An equation for a chemical reaction is considered to be balanced if both the reactants and the products have the same number of atoms and total charge. In other words, the mass and charge balances on both sides of the reaction are equal.
The coefficient in a balanced chemical reaction equation provides us with the following details about the reaction:
Coefficient tells us, the relative number of moles of each substance involved in a chemical reaction.
For example,
2H₂ + O₂----> 2 H₂O
That's mean, 1 moles of oxygen gives 2 moles of H₂O on reacting with 2 mol of Hydrogen.
The coefficient in a chemical equation tells us also, the number of molecules of reactants and
products involved in a chemical reaction. For example,
N₂ + 3 H₂. -----> 2 NH₃.
Their are, 1 molecule of Nitrogen and 3 molecules of Hydrogen gives 2 molecules of NH₃. therefore
coefficient tells us this information also.
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