Answer:
weak acids and weak bases only ionize partially. Therefore, when they are mixed, it generally results in a reversible reaction with the formation of a conjugate acid and a conjugate base as products.Weak acid-weak base neutralization reaction in which a weak acid reacts with a weak base to form a neutral salt and water.A gaseous compound is subjected to increased pressure. What is happening to the temperature at the same time?-increased temperature, increased volume-increased temperature, decreased volume-decreased temperature, increased volume-decreased temperature, decreased volume
A gaseous compound is subjected to increased pressure. What is happening to the temperature at the same time?
We assume the gas is in a container.
If we increase the pressure, is a direct relationship with temperature, so the temperature increases, but if the volume is not constant, it will decrease.
Answer: increased temperature, decreased volume.
Which of the following is not related to metallic bond?
A. Alloy
B. Shared electrons
C. Transferred electrons
D. Sea of electrons
Answer: B. Shared electrons
Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.
1. if the barometer reading is recorded to be higher than the actual value. what effect does this error have on the reported value of the molar mass of the compound? briefly explain (too high, too low, unchanged)
If the barometer reading is too high, the molar mass of the compound will be too low. If the barometer reading is too low, the molar mass of the compound will be too high.
The molar mass of the compound will be reported as higher than the actual value. This is because the barometer is used to calculate the pressure of the gas, and the pressure is used to calculate the molar mass. If the pressure is too high, the molar mass will be too low.
A barometer is an instrument that is used to measure the pressure of a gas. The pressure of a gas is the force that the gas exerts on a surface. The pressure of a gas is usually expressed in units of atmospheres.The molar mass of a substance is the mass of one mole of the substance. The molar mass of a substance is usually expressed in grams per mole. Hence if the barometer reading is recorded to be higher than the actual value, the reported value of the molar mass of the compound will be too low.
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In everyday language, macroscopic algae is called
Macroscopic algae are called Seaweed.
The largest and most complex marine algae are called seaweeds while the most complex freshwater forms are the Charophyta a division of green algae which includes, for example, Spirogyra and stoneworts. Algae are almost ubiquitous throughout the world and can be categorized ecologically by their habitats.
Planktonic algae are microscopic and grow suspended in the water, whereas neustonic algae grow on the water's surface and can be micro- or macroscopic. Phytoplankton refers to a group of plankton that is photosynthetic. Most of them are microscopic algal species or microalgae. The algae of this paraphyletic group Charophyta were previously included in Chlorophyta so green algae and Chlorophyta in this definition were synonyms.
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which is the correct order for the hydrolysis of sucrose reaction? (sucrase-sucrose-h2o) (sucrase) (sucrose) (h2o) (sucrase) (glucose) (fructose)
The correct order for the hydrolysis of sucrose reaction is sucrose(H2O)>sucrase>glucose>fructose.
Hydrolysis of sucrose:When sucrose is hydrolyzed, glucose and fructose are mixed in a 1:1 ratio. The primary component of honey is this concoction. It is known as invert sugar because the presence of the optical isomers of the mixture of glucose and fructose sugars causes the angle of the specific rotation of plain polarized light to change from a positive to a negative value.A water molecule aids in breaking the acetal bond during the hydrolysis of any di- or poly saccharide, as shown in the red diagram. The acetal bond is broken, and the oxygen on the glucose is combined with the H from the water. The carbon on the fructose is then given the -OH.For more information on sucrose kindly visit to
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can someone answer this 4 me?
The statement among the available options that describes the result of the study is that less than 50% of the people never felt phantom pain. Option 2.
Data interpretationIn order to interpret the data and find the best description of the outcome of the experiment, the response needs to be grouped into 2 from the 3 available responses.
Since those that phantom pain sometimes and always belong to the same category, the respondents can be summed up into one:
Number of those that sometimes feel phantom pain = 534
Number of those that always feel phantom pain = 193
Total number of people that feel phantom pain = 534 + 193
= 727 people
Number of people that never feel phantom pain = 183
Total number of respondents in the experiment = 183 + 534 + 193
= 910 people
Percentage of respondents that felt phantom pain = 727/910 x 100
= 79.89%
Percentage of people that never felt phantom pain = 183/910 x 100
= 20.11%
Percentage of people that felt phantom pain all the time = 193/910 x 100
= 21.21%
Thus, the statement that correctly describes the outcome of the experiment of all the statements is that less than 50% never felt phantom pain.
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in a metallic bond, the electrons are free to move easily from one atom to the next throughout the metal and are not attached to a particular atom, and are said to be
Electrons are said to be delocalized electrons
Delocalized electrons are electrons in a molecule, ion, or solid metal that are not associated with a single atom or covalent connection. Electrons that have been delocalized are trapped within an orbital that spans many neighboring atoms.
Because electrons can freely roam within these molecular orbitals, each electron becomes separated from its parent atom. Delocalization refers to electrons. The strong forces of attraction between the positive nuclei and the delocalized electrons hold the metal together.
As a result, in a metallic link, electrons are free to flow freely from one atom to the next across the metal and are not bound to a specific atom; these electrons are referred to as delocalized electrons.
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When a scientist performs an experiment, there are many changes that can occur. Which observation should she list as a chemical change?.
The substance must change into a new substance is the observation that scientist must list for a chemical reaction to happen.
A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present). The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry.
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Problem: Co3+ | Co2+ and Ni2+ | NiAnode?Cathode?(You need to use Reference Table B-16.)a. Co2+b. can't answerc. Ni2+d. Nie. Co3+
Answer:
- Anode: Co3+ | Co2+
- Cathode: Ni | Ni2+
Explanation:
The anode is where oxidation reaction occurs, and the cathode is where reduction reaction occurs.
From the table of reduction potencials, we find that:
- Co reaction:
[tex]\begin{gathered} Co^{3+}+2e^-\rightarrow Co^{2+} \\ E=1.81\text{ }V \end{gathered}[/tex]- Ni reaction:
[tex]\begin{gathered} Ni\rightarrow Ni^{2+}+2e^- \\ E=-0.250\text{ V} \end{gathered}[/tex]Now, to find out which one is the anode and which one is the cathode, it is necessary to compare the reduction potencials.
The reaction of Ni have negative potentials, so Ni will be the anode and Co will be the cathode.
I need homework help Which compound has the bigger Lattice energy?a) CaI2 CaCl2
Which compound has the bigger Lattice energy?
a) CaI₂ CaCl₂
To find the Lattice Energy we have to pay attention to the ions that form each compound.
In our case, both Cations are the same: Ca2+
So we have to find the difference between the anions: I- and Cl-
Calculate the number of moles in: 147 g BaF 2
To solve the question we need to:
Step 1 - Calculate the molar mass of BaF2
Step 2 - Use the following formula: moles = mass/molar mass
Step 1:
Atomic mass of Ba is 137.33 g/mol
Atomic mass of F is 19 g/mol
We can find these values at periodic table.
We multiply the atomic mass by the quantity of atoms of each element:
(1x137.33) + (2x19) = 175.33 g/mol
So the molar mass of BaF2 is 175.33 g/mol
Step 2:
moles = mass/molar mass
moles = 147/175.55
moles = 0.838 moles
Answer: 0.838 moles of BaF2
What is the process in which atoms rearrange to form new substances?
Considering the definition of chemical reaction, the process in which atoms rearrange to form new substances is chemical reaction.
Definition of chemical reactionA chemical reaction is the way in which one substance reacts with another. So, chemical reactions are thermodynamic processes of transformation of matter in which reactants or reactants intervene, which change significantly in the process, and can consume or release energy to generate two or more substances called products.
In a chemical reaction, chemical bonds between atoms are broken and new bonds are formed. In other words, for a specific product to be formed from a reactant, it is necessary to break bonds that hold them together and reorganize structures, forming new bonds and forming other substances.
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a guitar string vibrates at a frequency of 5 Hz and has a wavelength of 3 m. what is the wave speed?
What are the ionic compounds of gunpowder within fireworks, and what would be the chemical reaction of its combustion?
There are a lot of ionic compounds in fireworks, most of them are salts, like: Strontium Nitrate and Strontium Carbonate ( both in the color red); Calcium Carbonate and Calcium Chloride (orange); Sodium Nitrate, Sodium Oxalate (yellow); Barium Nitrate and Barium Carbonate (green) and so on. For the gunpowder itself we have the Potassium Nitrate as an ionic compound.
The chemical reaction for the combustion of black powder is:
6KNO3 + C7H4O + 2S -> K2CO3 + K2SO4 + K2S + 4CO2 + 2CO + 2 H2O + 3N2
It's not just a single reaction, but this is a general representation of it.
A 0.772g sample of an unknown compound, composed only of carbon and hydrogen, produced 2.31g of CO2 and 1.26g of H2O in a combustion analysis. What is the mass percent composition of carbon of the unknown compound?
The percent mass composition of carbon of the unknown compound is 42.8%.
What is the mass percentage of carbon in the given unknown compound?The mass percentage of carbon in the given unknown compound is calculated as follows:
moles of substance = mass / molar massmolar mass of carbon dioxide = 44.0 g/mol
molar mass of carbon = 12 g/mol
molar mass of water = 18 g/mol
molar mass of hydrogen = 1.0 g/mol
Moles of carbon dioxide = 2.31/44
Moles of carbon dioxide = 0.0525 moles
Moles of Carbon = 0.0525 moles
mass of carbon = 0.0525 * 12
mass of carbon = 0.105 g
Moles of water = 1.26/18
Moles of water = 0.07 moles
Moles of hydrogen = 0.07 * 2
Moles of hydrogen = 0.14 moles
mass of hydrogen = 0.14 * 1
mass of hydrogen = 0.14
mass of compound = 0.105 + 0.14
mass of compound = 0.245
Percentage mass of carbon = 0.105/0.245 * 100
Percentage mass of carbon = 42.8%
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Which of the following best describes one way the endocrine system effects the reproductive system?
A
The endocrine system directly produces sperm cells in men and egg cells in women, both which are needed for puberty.
B
The reproductive system produces hormones that are required in order for the endocrine system to work properly.
C
The endocrine system produces hormones that make puberty possible.
D
The endocrine system regulates mood and metabolism, both which are necessary for reproduction.
Answer:
C is the answer
Explanation:
True or false. A 3. 0-mole sample of co2 gas effused through a pinhole in 18. 0 s. It will take 1. 92 s for the same amount of h2 to effuse under the same conditions.
False, the effusion of the gas will be faster than the carbon dioxide.
The process of a gas escaping from a container through a hole that is significantly smaller in diameter than the molecules' mean free route is known as effusion in physics and chemistry. The gas escape is caused by the pressure difference between the container and the outside, which is why such a hole is frequently referred to as a pinhole. Since there are almost no molecular collisions in the vicinity of the hole under these circumstances, nearly all molecules that reach the hole continue and pass through it.
Graham's law of effusion can be used to find the rate of effusion: rate of effusion is inversely proportional to the molar mass of the gas.
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In the reaction H₂ + I₂ --> 2HI, what is the oxidation number of the hydrogen in the H₂ reactant? (2 pts)
*
2 points
-1
0
1
2
The oxidation number of hydrogen in H2 reactant will be 0.
The number assigned to each element in a chemical combination would be the simplest definition of the oxidation number. The amount of electrons that atoms in a molecule could share, lose or gain during forming chemical connections with other atoms of such a particular character would be known as the oxidation number.
Hydrogen can be considered as free elements and it is known that free elements have 0 oxidation number .Here, H2 element is also as a free element. So, it has 0 oxidation number.
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True or False: One reason for multiple atomic models over the
years is that atoms and their parts, subatomic particles, are
invisible. Atomic models changed as more technologies
became available to scientists.
A. True
B. False
Answer:
The answer is A. True
Explanation:
hope i helped
A. True
Atom in simple terms is the basic singular unit into which matter can be divided without any use or discharge of energy.
One of the major reasons for having multiple atomic models over the years is that atom and their parts, subatomic particles, are invisible.
This is where the atomic models came into play. Atomic models were theories about the structure and working of atoms based on the information that was available at that time.
The first atomic model was proposed by J.J Thomson, which is also called the plum pudding model. It proposed that within the atom there were negatively charged particles (electrons) that were floating in a positively charged liquid
The atomic model used today is Schrodinger's atomic model.
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Crystallization is a process of _________
Crystallization is a process of separation of the solid substances in an object located in the solution as crystal particles.
What is the chemical process of Crystallization?The chemical process of Crystallization refers to a procedure in which we apply different methods in a solution in order to separate crystals, which are solids compounds that may be considered solutes in such media.
Therefore, with this data, we can see that the chemical process of crystallization separates the solutes in a given solution as solid crystal particles that can be used in other applications.
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Consider the reaction8H₂S(g) + 402(g) →8H₂O(g) + S8 (g)AH₂S/At = -0.021 M/s
Part C the answer is Δ[S8]/Δt = 0.0026 M/s
Parte D the answer is v = 0.0026 M/s
balance the reaction between sno32- and s2- to form s and sno22- in basic solution. when you have balanced the equation using the smallest integers possible, enter the coefficients of the species shown. sno32- s2- s sno22- water appears in the balanced equation as a fill in the blank 5 (reactant, product, neither) with a coefficient of . (enter 0 for neither.) how many electrons are transferred in this
Balance the reaction between sno32- and s2- to form s and sno22- in basic solution. when you have balanced the equation using the smallest integers possible, enter the coefficients of the species shown. sno32- s2- s sno22- water appears in the balanced equation as a fill in the blank 5 (reactant, product, neither) with a coefficient of . (enter 0 for neither.) how many electrons are transferred in this.
2 electrons are transferred in this reaction
Water will appear as a reactant with a coefficient of 1, here as can be seen from above equation.
Electrons are the smallest of the particles that make up an atom, and they convey a poor rate. The wide variety of protons and electrons is equal in a neutral atom. The hydrogen atom, as an example, has simply one electron and one proton. The uranium atom, alternatively, has ninety two protons, and therefore, 92 electrons
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When the following equation is balanced with the smallest possible integer coefficients, what is the coefficient of H+?
Answer
D. 6
Explanation
Given that:
[tex]Cr+H^+\rightarrow Cr^{3+}+H_2[/tex]What to find:
The coefficient of H⁺ when the given equation is balanced with the smallest possible integer coefficients.
Solution:
The given equation is an example of an oxidation-reduction (redox) reaction
The first step is to identify the half equations:
[tex]\begin{gathered} Oxidation:Cr\rightarrow Cr^{3+} \\ \\ Reduction:H^+\rightarrow H_2 \end{gathered}[/tex]The next step is to balance the half equations molecularly follow by balancing the charge:
[tex]\begin{gathered} Oxidation:Cr\rightarrow Cr^{3+}+3e^-\times2 \\ \\ Reduction:2H^++2e^-\rightarrow H_2\times3 \\ \\ Multiply\text{ }oxidation\text{ }half\text{ }equation\text{ }by\text{ }2\text{ }and\text{ }reduction\text{ }halfe\text{ }quation\text{ }by\text{ }3 \\ \\ Ox\imaginaryI dat\imaginaryI on:2Cr\rightarrow2Cr^{3+}+6e^- \\ \\ Reduction:6H^++6e^-\rightarrow3H_2 \end{gathered}[/tex]The final step is to combine the half equations and simplified:
[tex]2Cr+6H^+\rightarrow2Cr^{3+}+3H_2[/tex]Therefore, the coefficient of H⁺ in the balanced equation above is 6.
The correct answer is D. 6
If 250 ml of methane, ch4, effuses through a small hole in 28 s, the time required for the same volume of helium to pass through the hole under the same conditions will be.
The time required for the same volume of helium to pass through the hole under the same conditions will be 14 seconds.
what is graham's law of diffusion?
Thomas Graham developed Graham's Law, also referred to as the "Graham's Law of Effusion," in 1848. Thomas Graham conducted experiments with the effusion process and identified a crucial characteristic: lighter gas molecules move more quickly than heavy ones.
Graham's Law states that at constant pressure and temperature, molecules or atoms having a lower molecular mass will effuse more quickly than those with a larger molecular mass. Thomas even discovered the speed at which they diffuse away. It means that the square root of a gas's molecular mass is inversely proportional to the rate of effusion of that gas.
How to find the time required for helium from graham's law of diffusion?
Graham's law of diffusion is given by
[tex]\frac{Rate 1}{Rate 2}[/tex] = [tex]\sqrt{\frac{M1}{M2} }[/tex], where Rate 1 is rate of diffusion for 1 ( volume per time) and Rate 2 is rate of diffusion for 2 ( volume per time).
M1, M2 are molecular weight of 1 & 2
In our case 1 → Methane, 2→ Helium
Molecular weight of methane([tex]CH_{4}[/tex]) → 16
Molecular weight of Helium ( He) → 4
Substituting in equation 1, [tex]\frac{Rate of Methane}{Rate of Helium}[/tex] =[tex]\sqrt{\frac{4}{16} }[/tex] = [tex]\sqrt{\frac{1}{4} }[/tex]= [tex]\frac{1}{2}[/tex]
[tex]\frac{Rate of Methane}{Rate of Helium}[/tex] = [tex]\frac{1}{2}[/tex]
Now, Rate of methane = [tex]\frac{Volume}{Time}[/tex]=[tex]V_{methane}[/tex] / 28
It is given that
[tex]V_{methane}[/tex] = [tex]V_{Helium}[/tex] = V
Let, time taken by helium be t
∴Rate of methane = [tex]\frac{V}{28}[/tex]
Rate of Helium = [tex]\frac{V}{t}[/tex]
Substituting above values in equation (2),
[tex]\frac{\frac{V}{28} }{\frac{V}{t} }[/tex] = [tex]\frac{1}{2}[/tex]
[tex]\frac{t}{28}[/tex] = [tex]\frac{1}{2}[/tex]
t = 14 seconds.
Therefore time required by helium = 14 seconds.
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based on the models of bonding in ethylene and acetylene, which molecule should have the greater carbon-carbon bond energy?
The compound that would have the stronger carbon carbon bond is acetylene.
What is the bond energy?The term bond energy has to do with the energy that is required to form a bond. It can also be seen as the energy that has to be supplied in order to break the bonds that are in the compound.
Now we know that the strength of a bond also has a lot to do with the length of the bond. We know that shorter bonds that have a greater s character are the ones that are always the stronger bonds. We have to factor in the fact that acetylene has a triple bond and ethylene has a double bond.
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1. what is the minimum number of moles of pb(no3)2 that must be added to 0.10 l of a solution that is 1.0 m in mgcl2 and 1.0 m in kcl in order to precipitate
0.4 moles Pb(NO3)2 must be added to 0.10 l of a solution in order to precipitate.
Molar concentration of the solution is the amount of the solute present in one unit of a solution. .it is expressed as mol/l.
Molar concentration = Moles of solute / volume of the solution
In a 1.0 M MgCl2. there is 2 moles of Cl-
In 0.1 L of solution there is: ( 0.1/1.0. x 2 moles of Cl- ions ) = 0.2 moles Cl- .In 0.1 L of solution there is: ( 0.1/1.0. x 2 moles of Cl- ions). =. 0.2 moles Cl-.
Total moles of Cl- ions are =0.4 moles Cl- .
molecular mass of pb(NO3)2 = 331.2g
Molecular mass of 1 chloride ion = 35.45g
1 mole of Cl- ions = 35.45g
0.4 moles of Cl- =. [0.4/1.0 x35.45g) =14.18g Cl-
0.4 moles of pb (NO3)2 = [ 0.4/1.0 ] x 331.2 g = 132.48g pb(NO3)2
Moles of pb(NO3)2 = 132.48g /331.2 g moles =. 0.4 moles of pb(NO3)2
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How much of NaCl is in 1.66 L of 0.400 M NaCl? Answer in units of mol.
The question requires us to calculate the number of moles of NaCl in 1.66 L of a 0.400 M NaCl solution.
To answer this question, we need to keep in mind that the molar concentration provides the amount of moles in one liter solution. Thus, we can write that:
1 L of NaCl solution -------------- 0.400 mol of NaCl
We can use this information to calculate the amount of NaCl, in moles, in 1.66 L in a 0.400 M NaCl solution:
1 L of NaCl solution -------------- 0.400 mol of NaCl
1.66 L of NaCl solution --------- x
Solving for x, we have:
[tex]x=\frac{(1.66\text{ L of NaCl solution)}\times(0.400\text{ mol of NaCl)}}{(1\text{ L of NaCl solution)}}=0.664\text{ mol of NaCl}[/tex]Therefore, there are 0.664 moles of NaCl in 1.66 L of a 0.400 M NaCl solution.
Of the following bonds, which is most polar?Group of answer choicesS-ClC-NC-BC-OP-S
Explanation:
The polarity of a bond is given by the difference in electronegativity between the two atoms that form said bond.
can i have help with this please
An acid-base reaction occurs when a fatty acid interacts with NaOH, and the fatty acid transfers a proton to the base to produce sodium carboxylate salt and water.
What is saponification ?Triglycerides are converted into glycerol and "soap" when they are saponified, or reacted with sodium or potassium hydroxide (lye). The triglycerides are often made of vegetable or animal fats. A hard soap is created when sodium hydroxide is used.
Fats, oils, or lipids (the acid) are turned into soap by the process of saponification by mixing them with sodium hydroxide (the base). Friction and heat from the chemical reaction are essential. The neutralization of the acid and base occurs during saponification.
Thus, any type of fat and sodium hydroxide react chemically in a process known as saponification.
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Determine the energy change associated with the transition from n = 2 to n = 5 in the hydrogen atom.
The energy change associated with the transition from n = 2 to n = 5 in the hydrogen atom is 2.856 eV.
Planck's equation, E = h, relates the energy change connected to a transition to the frequency of the electromagnetic wave. The equation c = then links the wave's frequency to both its wavelength and the speed of light.
The expression for the change in energy for a transition from a state to a state in a hydrogen atom is
E = -13.6Z² (1/Nf² - 1/Ni²)
where Z is the atomic number, which is 1 for hydrogen. Substituting
Nf= 5 and Ni= 2
E = -13.6 × (1/ (5)²- 1/ (2)²)
E = -13.6 × - 0.21
E = 2.856 eV
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