Consider this reaction:
At a certain temperature it obeys this rate law.
rate
Suppose a vessel containsat a concentration of. Calculate the concentration ofin the vesselseconds later. You may assume no other reaction is important
The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].
We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M.
Given reaction obeys the rate law, rate=k[A]²[B].
Here, the initial concentration of A= 0.10 M,
initial concentration of B = 0.05 M, and
rate constant, k = 2.0 × 10⁻⁴ M⁻¹s⁻¹
We have to find the concentration of A, after 30 seconds.
To find the concentration of A, we need to know the rate at 0.10 M and 0.05 M. Therefore, we have to calculate the rates at these concentrations.
rate1 = k[A]²[B]
= (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.10 M)²(0.05 M)
= 1.0 × 10⁻⁷ M/srate2
= k[A]²[B] = (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.09 M)²(0.04 M)
= 6.48 × 10⁻⁸ M/s
Using the integrated rate law for a second-order reaction: [A] = [A]₀ - kt where [A]₀ = initial concentration of A, k = rate constant, and t = time in seconds.
We know [A]₀ = 0.10 M and k = 2.0 × 10⁻⁴ M⁻¹s⁻¹.
Substituting the values in the above equation, we get: [A] = [A]₀ - kt= 0.10 M - (2.0 × 10⁻⁴ M⁻¹s⁻¹)(30 s)≈ 0.0934 M
Therefore, the concentration of A in the vessel after 30 seconds is 0.0934 M.
This question requires us to calculate the concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].
We are given the initial concentration of A and B and the rate constant of the reaction. To find the concentration of A after 30 seconds, we need to calculate the rates at the initial concentrations of A and B.
Using the integrated rate law for a second-order reaction, we can find the concentration of A at any given time. We substitute the given values in the formula and solve for [A]. We get the concentration of A as 0.0934 M after 30 seconds. This calculation is based on the assumption that no other reaction is important.
The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B]. We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M. This calculation assumes that no other reaction is important.
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For the reactions listed below, decide whether the reaction would increase, decrease, or stay the same.
The rate of the reaction is the speed at which the reactants are used to produce the products. An increase in temperature and concentration of the reactant increases the rate of reaction.
What are the factors affecting the rate of reaction?The rate of the reaction is the speed at which the products are used to produce products. The rate increases when the concentration of the reactants in a reaction is increased. Also, the smaller grounded pieces of reactants increase the reaction rate as the surface area gets increases.
The rise in temperature and the addition of the catalyst also increases the rate of reaction as temperature and the catalysts increase the chemical reaction by increasing the speed.
When an inhibitor is added to a reaction then the rate of the reaction decreases as they inhibit the formation of the products and block the reaction pathways.
Therefore, the inhibitors decrease the rate of the reaction.
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When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are Question Blank 1 of 2 choose your answer... those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an
When strengths of intermolecular forces of attraction between solute and solvent species in a solution are those present in separated components, solution is formed with no accompanying energy change. Such a solution is called an ideal solution.
An ideal solution refers to a homogeneous mixture where the components (solvent and solute) mix uniformly on a molecular level, displaying ideal behavior according to Raoult's Law. In an ideal solution, the intermolecular forces between the solute and solvent are similar in strength, resulting in no deviation from ideal behavior.
In an ideal solution, the interactions between solute-solute, solvent-solvent, and solute-solvent are similar in strength. This means that the intermolecular forces, such as hydrogen bonding, dipole-dipole interactions, or dispersion forces, are comparable between the solute and solvent molecules. As a result, the mixing process is energetically favorable, and there is no net energy change associated with the formation of the solution.
Ideal solutions are often observed when the solute and solvent have similar chemical structures and exhibit similar intermolecular forces. Examples of ideal solutions include solutions of ethanol and water, where the hydrogen bonding between the molecules leads to a favorable mixing process.
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One unusual characteristic of water is its high specific heat, which means that water __. Multiple select question. warms or cools surrounding areas boils at a higher temperature than other liquids retains surface tension better than other liquids changes temperature slowly absorbs a great amount of heat before its temperature changes
The high specific heat of water means that water absorbs a great amount of heat before its temperature changes.
Specific heat capacity of waterSpecific heat capacity of a substance is defined as the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C).
There are substances that has low Specific heat capacity for example metals like iron while some other substances have high specific heat capacity like water.
The high specific heat capacity seen in water means that it takes more energy to increase the temperature of water compared to other substances.
Therefore, the high specific heat of water means that water absorbs a great amount of heat before its temperature changes.
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Answer:
absorbs a great amount of heat before its temperature changes
changes temperature slowly
warms or cools surrounding areas
Explanation:
got it wrong for yall
Which two statements explain ways in which cells get nutrients?
A. Transport proteins help molecules cross cell membranes.
B. A chloroplast converts energy from sunlight into organic matter.
I C. The nucleus provides the instructions for making proteins from
amino acids.
D. Mitochondria change energy stored in organic compounds into a
usable form.
help plz
Answer: B and D
Explanation:
Just did the test and these make the most sense
A chloroplast converts energy from sunlight into organic matter.
Mitochondria change energy stored in organic compounds into a
usable form. the two statements are ways in which cells get nutrients.
Proteins embedded in the cellular membrane act as ushers. They help carry nutrients from the bloodstream into the cell. Glucose, amino acids, fats, and vitamins use carrier proteins to get inside cells.Onice through the membrane, nutrients play many important roles. Some cells, like muscle fibers, need minerals like calcium to flood the cell to move your arms and legs. Others, like nerve cells, need sodium and potassium to be pumped in and out so your brain can pick up sensory information.Cells use the glucose in your bloodstream to create energy by making ATP, the cellular energy currency. And amino acids are the building blocks for all DNA. When they’re brought into the cell, amino acids help transfer genetic information so cells can replicate.Learn more about cells get nutrients
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Gallium is a metallic element in Group III. It has similar properties to aluminium.
(a) (i) Describe the structure and bonding in a metallic element.
Metallic elements exist in a solid-state and they are opaque, have a shiny surface, good conductors of electricity and heat, malleable and ductile, and are dense. The structure of metals is formed by atoms that are held together by metallic bonds. These atoms have loosely bound valence electrons that can be shared between the neighboring atoms.
Therefore, the outermost shells of these atoms are incomplete due to the sharing of valence electrons, forming a lattice structure known as a metallic bond.Metallic elements have a unique crystal structure that occurs in two forms. The most common type of metal crystal structure is the body-centered cubic structure where the atoms are arranged in a cube with one atom located at the center of the cube. The other type of metal crystal structure is the face-centered cubic structure, where each corner of the cube is an atom and there is an additional atom at the center of each face of the cube .Metallic bonding occurs due to the delocalized electrons that exist in the metal structure. The valence electrons from each atom are free to move throughout the entire metal lattice. Therefore, these electrons form a "sea of electrons" that is shared by all the atoms in the lattice. This results in the metal structure having high thermal and electrical conductivity.Metals are known for their ductility and malleability properties. These properties are due to the metallic bonding that exists in the metal structure. Since the valence electrons are shared, they can easily move past one another, allowing the metal to be hammered into different shapes without breaking.The properties of metals vary depending on their structure and bonding. Gallium, being a metallic element in Group III, has similar properties to aluminum. Therefore, it has a similar metallic bond structure with delocalized electrons that provide the metal with its unique properties.For such more question on valence electrons
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True or False. Isotopes have different chemical properties. Explain why?
Answer:
False
Explanation: isotopes generally have the same physical and chemical properties because they have the same numbers of protons and electrons.
Is brass a heterogeneous or homogeneous mixture ??????
Answer me first and right and then I promise you I will mark you the brainliest.
Also 20 points
Answer:
Brass is a homogenous mixture of copper and zinc
Hope it helped u, plz put thanks
Answer:
Brass is an alloy made up of uniform composition of copper and zinc. It is a homogeneous mixture in which zinc and copper can be varied to create a range of brasses with varying properties.
Explanation:
Hope it helps jenita or jeni , ya jenny
How many grams are 1.20 x 1025 molecules of calcium iodide?
Answer:
1230
Explanation:
1.20×1025=1230 is your answer
An ion has an atomic number of 13, a mass number of 27, and 10 electrons. How many neutrons does the nucleus of the ion have?
14
13
3
27
Answer:
\(\huge\boxed{\sf 14}\)
Explanation:
Atomic number = 13
Mass number = 27
No. of neutrons:= Mass number - Atomic number
= 27 - 13
= 14\(\rule[225]{225}{2}\)
4. Refer the table given below to answer the questions fon Electronic configuration Element Atomic number 11 R 19 2,8,1 2,8,8, 1 2,8,8, 92 20 S T 12 2,812. Are the above elements Q, R, S and I metals or non-metals? Support your answer with reasona.
Answer:
The electronic configuration of the element with Atomic number 19 is 2,8,8,1. The element is potassium. It is an alkali metal with one valence electron.
Each time the boy breathes, he exhales 0.5012 L of gas. How many moles of gas does he exhale?
Answer:
.52
Explanation:
Each time the boy breathes, he exhales 0.5012 L of gas. The moles of gas exhale is 0.52 moles.
What is gas?Gas is defined as a sample of matter that, even in the presence of gravity and regardless of the amount of substance in the container, adopts the shape of the container in which it is housed and develops a uniform density inside the container. They extend to fill their containers and are simple to compress.
0.5012 L g of pure CO2 are exhaled by the individual. Divide the result by the molar mass to get the number of moles. Therefore, the individual exhales about 0.52 moles of carbon dioxide every hour. The lungs are compressed, and air is forced outward. 4.4% of the carbon dioxide in exhaled air is carbon dioxide.
Thus, each time the boy breathes, he exhales 0.5012 L of gas. The moles of gas exhale is 0.52 moles.
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The lattice constant of Ge at room temperature is a=5.65×10 −8 cm. Detcrmine the number of Ge atoms /cm 3 . B. Calculate the distance from the center of one Germanium atom to the center of its nearest neighbor. C. The density of valence electrons /cm ∧ 3
A. The number of Ge atoms/cm is 5.54 × 10²⁴.
B. The distance from the centre of one Germanium atom to the centre of its nearest neighbour is 2.825 × 10⁻⁸cm.
C. The density of valence electrons /cm³ is 7.07 × 10⁷.
To determine the number of Germanium (Ge) atoms per cm³, we can use the lattice constant and the assumption that the Ge crystal structure forms a simple cubic lattice.
a. The volume of the unit cell in a simple cubic lattice is given by the cube of the lattice constant:
Volume of unit cell = a³ = (5.65 × 10⁻⁸ cm)³
a³ = 180.36 × 10⁻²⁷
Since each unit cell contains one Ge atom, the number of Ge atoms per cm³ is equal to the reciprocal of the volume of the unit cell:
Number of Ge atoms/cm³ = 1 / (a³ = 1 / [(5.65 × 10⁻⁸ cm)³]
= 0.00554447 × 10²⁷
= 5.54 × 10²⁴
b. The distance from the centre of one Ge atom to the centre of its nearest neighbour can be determined by considering the arrangement of atoms in the simple cubic lattice. In this case, each Ge atom has six nearest neighbours, located at the corners of a cube surrounding the central atom.
The distance from the centre of one atom to the centre of its nearest neighbour is equal to half the length of the edge of the cube:
Distance to nearest neighbor = a / 2 = (5.65 × 10⁻⁸ cm) / 2
= 2.825 × 10⁻⁸cm
c. The density of valence electrons per cm³ can be calculated by multiplying the number of Ge atoms per cm (determined in part a) by the number of valence electrons per Ge atom. Germanium has four valence electrons.
The density of valence electrons/cm³ = Number of Ge atoms/cm³ × Number of valence electrons per Ge atom
Density of valence electrons/cm³ = (1 / [(5.65 × 10⁻⁸ cm)³]) × 4
= 7.07 × 10⁷
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a container with no insulation has two compartments. the first compartment is evacuated to zero pressure, and the other contains a compressed gas that is not an ideal gas. supposed the separation between the two compartments is removed. what type of process is this?
A container with no insulation has two compartments. the first compartment is evacuated to zero pressure, and the other contains a compressed gas that is not an ideal gas. supposed the separation between the two compartments is removed-Isothermal process
thermodynamic process wherein the temperature of a framework remains unchanged is known as an isothermal process. Heat is transferred into and out of the system at such a slow rate that thermal equilibrium is retained. The formula gives the value of work done either by gas in an isothermal process. W=−nRTln(V2V1) Isothermal, named after the region's consistent climate, is a two-year comprehensive public institution that is part of the North Carolina Community College System. The primary goal of Isothermal is to improve people's lives through education. Spindale's main campus spans 181 acres.
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recall that photosynthetic rates remain relatively constant in regions near the equator. imagine that tropical environments persist throughout earth's northern and southern hemispheres; that is, that earth's entire climate mirrors that near the equator. if keeling had collected his atmospheric co2 data on such an earth, what would you expect the keeling curve to look like? please choose the correct answer from the following choices, and then select the submit answer button. answer choices a straight line sloping upward, indicating that atmospheric co2 levels would not seasonally oscillate, but would increase over time a straight line sloping downward, indicating that atmospheric co2 levels would not seasonally oscillate, but would decrease over time a straight line without a slope, indicating that atmospheric co2 levels would have remained constant over time a sinusoidal curve sloping upward, indicating that atmospheric co2 levels would fluctuate seasonally, but would increase over time a sinusoidal curve sloping downward, indicating that atmospheric co2 levels would fluctuate seasonally, but would decrease over time
A Straight line sloping upward (atmospheric CO2 levels would not seasonally oscillate, but would have increased over time).
A straight line up the graph means it has a positive slope, meaning that even though atmospheric carbon dioxide levels would not oscillate through the seasons, in this case in tropical environments in the northern and southern hemisphere Earth, that is, the climate close to the equator, the positive slope indicates that carbon dioxide levels would increase over time.
Photosynthesis is the process through which green plants and certain other organisms make their food using carbon dioxide and water in the he presence of Sunlight.
During photosynthesis, energy conversion from light energy into chemical energy takes place.
Photosynthesis is one of the major processes that helps to eliminate and reduce the quantity of carbon dioxide in the atmosphere,it also serve to make oxygen present in the atmosphere.
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3. In which 1. 0-gram sample are the particles arranged in a crystal structure? A) CaCl2(s) B) C2H6(g) C) CH3OH(l) D) CaI2(aq)
According to the given information CaCl₂(s) are the particles arranged in a crystal structure.
The correct option is A.
What is crystal structure and its types?A crystal system is composed of a number of axes. Or, to put it another way, the structure is an arranged grouping of atoms, ions, or molecules. The crystal structure is made up of bonded atoms, atom clusters, or molecules. Due to the constituent particles' innate propensity to arrange themselves in symmetrical patterns, this structure forms.
Briefing:This inorganic salt is crystallized calcium cations and chlorine anions. Ions are grouped in a systematic way.
Ethane (C₂H₆) is a gas; the symbol for a gas in chemistry or its physical state is g. Gases lack a solid structure.
Methanol (CH₃OH) is a liquid; the symbol for liquids in chemistry is l, and it lacks a structural structure.
Since water dissolves calcium iodide, the resulting aqueous solution (aq) lacks a crystal structure.
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Suppose only 5,550J heat was used to warm up the same 55.0g of water. If the water started out at 25 degrees celsius what would its final temperature become?
Answer:
What is the heat in joules required to raise the temperature of 25 grams of water from 0 degrees C to 100 degrees C? What is the heat in calories? Answer: 10450 J or 2500 calories of heat energy are required to raise the temperature of 25 grams of water from 0 degrees C to 100 degrees C.
a solution is made using 400.0 ml of phenol (density 1.070 g/ml) and 1217.9 ml of water (density 1.000 g/ml). what is the mass percent of the phenol?
To calculate the mass percent of the phenol in the solution, we first need to calculate the total mass of the solution.
The total mass of the solution can be calculated by multiplying the density of phenol (1.070 g/ml) by the volume of phenol (400.0 ml), and adding this to the mass of the water (1217.9 ml x 1.000 g/ml).
This gives us a total mass of the solution of 506.77 g.
To calculate the mass percent of the phenol in the solution, we need to divide the mass of phenol by the total mass of the solution and multiply this by 100.
The mass of phenol is 400.0 ml x 1.070 g/ml, which equals 427.8 g. The mass percent of the phenol is 427.8 g/506.77 g x 100 = 84.3%.
In conclusion, the mass percent of the phenol in the solution is 84.3%.
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Which element is likely to have a high thermal conductivity? antimony carbon chlorine sodium
The element which is likely to have a high thermal conductivity among given options is sodium.
What is thermal conductivity?Thermal conductivity of any substance is define as the capability of the substance to carry heat or transfer of heat.
As we know that metals are the good conductors of heat and non-metals are bad conductors, so we exclude carbon, antimony and chlorine atom from this group as they are non-metals. And sodium atom has the thermal capability.
Hence option (4) is correct.
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Answer: Option (4) is correct
Explanation:
Emily found a piece of metal. She doesn't know what kind of metal it is. What might she measure in lab to find out what
type of metal it is? Is this a physical or chemical property?
Answer: Emily can measure the density of the piece of metal to find out what it is. Density is a physical property.
Explanation:
The density of a substance can be found by dividing its mass by its volume. No chemical reaction is involved in measuring the mass nor the volume; therefore, density is a physical property.
Select the correct answer from the drop-down menu.
Photograph shows a mushroom shaped cloud of volcanic ash.
(blank) is the most likely resource to be found near the base of a volcano on Earth’s surface.
metal ore
i got this question before and answered this one correctly trust me its right
Answer:
metal ore
Explanation:
. describe how the ph of a solution relates to the hydrogen ion concentration. does a solution at ph 1 have more or less hydrogen ions than a solution at ph 4?
A solution at pH 1 has more hydrogen ions than a solution at pH 4. The pH of a solution refers to the hydrogen ion concentration.
The concentration of hydrogen ions and the pH of a solution are inversely proportional. This means that the higher the hydrogen ion concentration, the lower the pH, and vice versa.
A solution at pH 1 will have more hydrogen ions than a solution at pH 4.The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration. The equation for calculating the pH of a solution is given as follows:
\($$pH = -\log_{10}[H^+]$$\)
In this equation, [H⁺] is the hydrogen ion concentration in moles per liter (mol/L) of solution. A change of 1 pH unit corresponds to a 10-fold change in the hydrogen ion concentration.
Therefore, if a solution has a pH of 1, it has a hydrogen ion concentration of 0.1 mol/L.
If a solution has a pH of 4, it has a hydrogen ion concentration of 0.0001 mol/L. Thus, a solution at pH 1 has more hydrogen ions than a solution at pH 4.
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:quilibrium:
1. Define equilibrium when the equation
Use the equation below to answer the following equilibrium questions:
H₂O (g) + CO (g) =H₂(g) + CO₂(g) + 42 KJ
2. In the reaction above, what could happen that causes the equilibrium to shift to the right?
3. In the reaction above, what could happen to cause the equilibrium to shift to the left?
4. If pressure was increased, what direction would equilibrium shift?
5. If heat was added, what direction would equilibrium shift. What would happen to the concen
6.
If CO was added, what direction would equilibrium shift. What would happen to the concent
chiometry:
the following equation to answer the questions that follow:
Equilibrium is a state in a chemical reaction where the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in the concentrations of reactants and products. It is represented by a double arrow (⇌) in chemical equations. In the given equation: H₂O (g) + CO (g) ⇌ H₂(g) + CO₂(g) + 42 KJ
To shift the equilibrium to the right, one or more of the following could occur:
Increasing the concentration of H₂ or CO₂
Decreasing the concentration of H₂O or CO
Increasing the pressure
Removing some of the products (H₂ and CO₂)
Decreasing the temperature
To shift the equilibrium to the left, one or more of the following could occur:
Decreasing the concentration of H₂ or CO₂
Decreasing the pressure
Increasing the temperature
If pressure is increased, the equilibrium will shift in the direction that produces fewer moles of gas. In this case, since there are fewer moles of gas on the right side of the equation (H₂ and CO₂), the equilibrium will shift to the right. If heat is added, the equilibrium will shift in the endothermic direction to absorb the additional heat. In this case, the forward reaction is endothermic (42 KJ on the right side), so the equilibrium will shift to the right to consume the added heat.
If CO is added, the equilibrium will shift to the right to consume the additional CO.The concentration of H₂O and CO₂ will increase, while the concentrations of H₂ and CO will decrease until a new equilibrium is reached.
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Which of these statements are true of water molecules? Check all that apply.
The statements which are true of water molecules as per forces of attraction are water molecules are polar.Water molecules undergo hydrogen bonding.Water molecules have a bent geometry.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
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Your question is incomplete, but most probably your full question was,Which of these statements would be true if the water molecule was linear instead of bent? Check all that apply. Water molecules are polar. Water molecules are nonpolar. Water molecules undergo hydrogen bonding. Water molecules have a linear geometry. Water molecules have a bent geometry.
The probability that a system is in a particular state after a large number of periods is a. independent of the beginning state of the system. b. the same for every ending system. c. dependent on the beginning state of the system. d. equal to one half.
The probability that a system is in a particular state after a large number of periods is dependent on the beginning state of the system.
This is because the probability of transitioning from one state to another is influenced by the current state of the system.
However, as the number of periods increases, the probability of being in a particular state tends to converge to a fixed value, known as the steady-state probability.
This steady-state probability is not necessarily the same for every ending system, as it depends on the transition probabilities between states.
The probability of being in a particular state after a large number of periods can be calculated using Markov chain analysis, which considers the probabilities of transitioning between states over time.
Therefore, options a and d are incorrect, while options b and c partially capture the nature of the system's probability distribution.
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the speed of a wave is 8.0m/s and the frequency is 300Hz find the wave length
Chemistry deals with all the following except: Select one: a. The composition of matter. b. The properties of matter. c. Our eating habits. d. The conversion of matter between various states.
Answer:
C. Our eating habits
Hope that helps.
The process in which substances are changed into different substances is called
A. Chemical property
B. Physical change
C. Physical property
D. Chemical change
Two elements in the same group may have the same ion charge.
A. True
B. False
A polar covalent bond involves _______________ of valence electrons?
A. an equal sharing
B. a transfer
C. an electrostatic attraction
D an unequal sharing
Answer:
1. chemical change
2. true
3. an unequal sharing
Explanation:
PLEASE HELP!! What is the pH of a solution with a [H3O+] concentration of 3.4 x 10-11 M? Is the solution acidic, basic, or neutral?
\(\\ \tt\leadsto pH=-log[H^+][/texM
\(\\ \tt\leadsto pH=-log[3.4\times 10^{-11}]\)
\(\\ \tt\leadsto pH=-log3.4-log10^{-11}\)
\(\\ \tt\leadsto pH=-0.53+11\)
\(\\ \tt\leadsto pH=10.47\)
Basic
Considering the definition of pH, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]= - log [H₃O⁺]
Numerical scale of pHThe numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
pH in this caseIn this case, you know [H₃O⁺]= 3.4×10⁻¹¹ M.
Replacing in the definition of pH:
pH= -log (3.4×10⁻¹¹ M)
Solving:
pH= 10.47
Finally, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.
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Which of the following is NOT evidence that whales and dolphins changed over time and once lived on land?
a. They have lungs
b. They have arm bones that look like those bones of land qwelling organisms.
c. They have small hairs.
d. They do not have hair.
Answer:
Am not so sure but I think that your ans is a
Answer:
D.
Explanation:
Because that's what every mammal has that lives on land. (Whales and dolphins are mammals)