Answer:
The number and variety of plants would increase.
Explanation:
A is incorrect because if deer eat plants and the population of deer are increased there wouldn't be an increase of plants. There would be a decrease of plants be ause there would be more deer eating plants. B is incorrect because if there are more deer, then the amount of plants will also decrease. C is correct because with a surplus of deer, the amount of plants would decrease because of all the deer. Therefore, the variety of plants would decrease because they are being eaten. D is incorrect because if there is a population growth of deer, that means more deer are eating the plants. So, the plant population would decrease.
Hope this helps! :)
In a forest, deer eat plants for survival.The number and variety of plants would increase in the deer population to affect the plant life of an ecosystem. Therefore, option A is correct.
What is an ecosystem ?An ecosystem is a geographical area in which plants, animals, and other organisms, as well as weather and landscape, coexist to form a life bubble. Ecosystems contain both biotic (living) and abiotic (nonliving) components.
An ecosystem is a group of living organisms (plants, animals, and microbes) in a specific location. The term 'eco' refers to a region of the world, and the term'system' refers to the organizing units.
Because deer eat a wide variety of plants, the plant population would suffer as a result. More deer necessitates more food. Plant predation by deer populations would reduce the population of other animals that eat plants and plant seeds.
Thus, option A is correct.
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Please help guys
92.)-For neutralization 31 cm³. 0,16 N. alkali solution
requires 217 cm³. of H₂SO4 solution. What are the normality and
titer of an H₂SO4 solution? Answer: 0.023 n .; 1.127. 10³ g /
cm³.
93)-What volume is 0,3 N. acid solution is required to
neutralize a solution containing 0,32 g of NaOH in 40 cm³?
Answer: 26,6 cm³.
94)- Neutralization of 1 liter of a solution containing 1,4 g of
KOH requires 50 cm³. of an acid solution. Calculate the
normality of the acid solution. Answer: 0,53 n.
95)-What mass of HNO, was contained in the solution if 35
cm3. of 0,4 N was required to neutralize it? NaOH solution?
What is the titer of a NaOH solution? Answer: 0,882 g, 0,016 g/
cm³.
96)-What mass of NaNO, should be dissolved in 400 g of
water to prepare a 20% solution?
To neutralize a solution containing 0.32 g of NaOH in 40 cm3 requires 26.66 cm3 of 0,3 S. a. acid solution.
What does normalcy mean?The quantity of moles per solution liter is how it is defined. It is utilized to calculate the number of grams that make up the solution's entire volume. It is utilized to calculate the mole ratio in the solution's overall volume. Normality is measured in units.
Calculation
How to calculate volume?
N1V1 = N2V2
normality = molarity x basicity
For sulfuric acid, the basicity is 2.
∴N1=0.3N
V1=?
Normality of NaOH is [0.32/(40×40)]×1000
N2=0.2×1=0.2N
V2=40ml
0.3 x V1 = 0.2 x 40
V1 = 26.6 cm³
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Cos x tan x - cos x = 0
Answers:
0 + n pi, pi/4 + 2n pi
0 + n pi, 5pi/4 + 2n pi
Pi/2 + n pi, 5pi/4 + 2n pi
Pi/2 + n pi, pi/4 + 2n pi
Answer:0+npipi/4+2npi
Explanation:
Calculate the relative molecular mass of hydrated Copper (II) tetraoxosulphate (VI) CuSO4.5H₂O (Cu = 64 S = 32 H = 1 0 = 16).
The relative molecular mass of hydrated Copper (II) tetraoxosulphate (VI) CuSO4.5H₂O is 249.
What is molecular mass?Molecular mass is a measure of the total mass of one mole of a substance, which is defined as the mass of the substance divided by the number of molecules it contains. It is typically expressed in g/mol and is also known as molar mass. Molecular mass is determined by the types and number of atoms that compose a molecule, and is an important factor in understanding the properties of a substance.
This is calculated by adding the atomic masses of all the atoms present in the compound.
The atomic mass of copper is 64, sulphur is 32, oxygen is 16, and hydrogen is 1.
So, the relative molecular mass of hydrated Copper (II) tetraoxosulphate (VI) CuSO4.5H₂O is 64 + 32 + (16*4.5) + (1*5) = 249.
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The "normal" lead content in human blood is about part per million (that is, of lead per million grams of blood). A value of part per million is considered to be dangerous. How many grams of lead are contained in of blood (the amount in an average adult) if the lead content is ? Be sure your answer has the correct number of significant digits.
The mass of lead present in 6.0 × 10³ g if the lead content is 0.62 ppm is 0.0037 g of lead.
What is a part per million concentration?One part per million (ppm) concentration is equivalent to 1 milligram of a solute per liter of water (mg/l) or 1 milligram of something per kilogram soil (mg/kg).
The mass of lead present in 6.0 × 10³ g if the lead content is 0.62 ppm is calculated as follows:
Mass of lead in blood = 0.62 * 1 mg/kg * 6.0 × 10³ g / 1000
Mass of lead in blood = 0.0037 g of lead
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Complete question:
The “normal” lead content in human blood is about 0.40 part per million (that is, 0.40 g of lead per million grams of blood). A value of 0.80 part per million (ppm) is considered to be dangerous. How many grams of lead are contained in 6.0 × 10³ g of blood (the amount in an average adult) if the lead content is 0.62 ppm?
A compound is found to contain 30.4% nitrogen and 69.6% oxygen. If it has a molecular mass of 92.0, what is its molecular formula?
Answer:
Molecular formula = N2O4
Explanation:
Step 1: Assume that the mass of a compound is 100%
Step 2: Calculate the number of moles of each element
Step 3: Represent an empirical formula
Step 4: Divide the number of moles of each element by the least number of moles
Step 5: Write the empirical formula
Step 6: Calculate the empirical mass
Step 7: Represent a molecular formula
Step 8: Solve for n by dividing molecular mass by empirical mass
Step 9: Multiply the subscripts of the empirical formula by the value of n to obtain the molecular formula
Air has a density of 0.001226 g/ml. What volume of air would have a mass of 1.0 lb? How do I arrive at 3.7 x 10^2 l? I understand the math but not how to put it in scientific notation.
Answer:
3.6999 x 10^2 l.
Explanation:
To find the volume of air with a mass of 1 lb, we can use the density formula:
Density = Mass divided by Volume
Rearranging the formula to solve for volume:
Mass / Density = Volume
Given that the density of air is 0.001226 g/ml, and we want to find the volume of 1 lb of air, we can substitute the following values into the equation:
(1 pound) / (0.001226 g/ml)
To convert pounds to grams, 1 pound equals 453.59 grams.
Volume = 453.59 g/0.001226 g/ml = 369,988.6 ml
Now we can convert from milliliters to liters. 1 liter equals 1,000 milliliters.
Volume = 369.99 l/1000 = 369,988.6 ml
To express it in scientific notation, you can use a factor of 10 to represent the decimal place. You move the decimal point of the number to the left or right until you have only one non-zero digit to the left of the decimal point.
369.99 l = 3.6999 x 10^2 l
So the volume of 1 lb of air is 3.6999 x 10^2 l.
Diethyl ether has a ΔHvap of 29.1 kJ/mol and a vapor pressure of 0.703 atm at 25.0°C. What is its vapor pressure at 81.0°C?
The new Vapor pressure of the dietheylether is 6.52 atm.
What is the vapor pressure?We have to note that the vapor pressure would have to do with the ease with which the substance can be converted from liquid to vapor. In this case we can see that we have about two different temperatures and we are trying to obtain the vapor pressure at each of the temperatures that have been given.
Using the formula;
ln(P2/P1) = -ΔHvap/R(1/T2 - 1/T1)
P2 = final pressure
P1 = initial pressure
ΔHvap = Enthalpy of vaporization
R = constant
T = Temperature
ln(P2/0.703) = -29.1 * 10^3/8.314(1/354 - 1/298)
ln(P2/0.703) = -3651.3(0.0028 - 0.0034)
ln(P2/0.703) = 2.19
(P2/0.703) = e^2.19
P2 = e^2.19 * 0.73
P2 = 6.52 atm
It has a vapor pressure of about 6.52 atm.
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HELP QUICK
This large tectonic plate is bounded on three sides by what's know as the Ring of Fire. What is the name of this tectonic plate?
Responses
A Indo- Australian Plate
B Eurasian Plate
C North American Plate
D Pacific Plate
Answer:
D
Explanation:
What do clouds and dew have in common?
They are both made of water vapor.
They are both forms of precipitation.
They both exist in Earth’s atmosphere.
They both form when water vapor condenses. I NEED HELP THIS IS MY FIRST TIME USING THIS BRAINLY THING PLEASE ANYONE HELP ME ON THIS ONE QUESTION
Cloud and dew both form when water vapor condenses. The last option.
What is condensation?Condensation is a phase-change process involving a change from the vapor phase to the liquid phase. It is the opposite of evaporation which involves a phase change from liquid to vapor.
Clouds are formed when microscopic water vapors present in the upper stratosphere condense to form visible water vapor or ice crystals. Dews, similarly, are formed when water vapors condense into visible liquids.
In other words, both clouds and dews are formed by the condensation of water vapors.
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What is equal to equivalent volume of hydrogen (NC)?
Calculate the equivalent weight of the metal if 0.28 L of
hydrogen (NC) was consumed to reduce 1.017 g of its oxide.
According to the question, Equivalent volume of any gas at STP is 22.4 litre. So, Equivalent volume of hydrogen, will be 22.4 litre. Equivalent wt. of metal= 0.025gm
What is the purpose of hydrogen?Hydrogen may be utilized to heat our dwellings and places of business in addition to powering vehicles and producing electricity. To reach net zero, it will be crucial to reduce our carbon emissions significantly.
Where can you find hydrogen?The majority of stars and the sun include it, and the planetary Jupiter is primarily made of it. Less than consistent with similar per million per volume is all that is found when it is a gas present in the air.
Equivalent wt. of metal/Weight of metal =moles of [tex]H_{2}[/tex] ×valency factor
Equivalent wt. of metal/ 1.017 g = (0.28 L/22.4 L) ×2
Equivalent wt. of metal= 0.025gm
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Can you help me with this question
After much experimentation, John discovers a law which says that the wavelengths of light absorbed by hydrogen gas fit into a pattern which he is able to express in a mathematical formula.
Niels has a hypothesis about why the wavelength of light absorbed by hydrogen has a certain value. Niels suggests the orbit of the electron in the hydrogen atom can only have certain radii, and when the electron "jumps" from one orbit to another, it emits light of an energy corresponding exactly to the difference in orbit energies.
About wavelengthIn physics, wavelength is defined as the distance traveled by a wave in one period. Wavelength is represented by the Greek letter lamda (λ). That's why the wavelength formula is often called the Lambda formula.
How to calculate the lambda formula depends on the type of wave. Based on the direction of propagation, waves are divided into two types, namely transverse waves and longitudinal waves.
Transverse waves are waves whose direction of propagation is perpendicular to the direction of vibration. Examples include water waves, string waves, and light waves. Meanwhile, longitudinal waves have a direction of propagation that is parallel to the direction of vibration, for example sound waves.
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when adenosine diphosphate (adp) binds an additional phosphate group to create adenosine triphosphate (atp), this type of reaction is considered .
When adenosine diphosphate (ADP) binds an additional phosphate group to create adenosine triphosphate (ATP), this type of reaction is considered as Phosphorylation.
The terminal oxygen atom of the disphosphate group of ADP attacks the P atom of an inorganic phosphate in a process called phosphorylation. In the biological cell, ATPs are synthesized from ADP through (1) substrate level phosphorylation and (2) oxidative phosphorylation.
Substrate level phosphorylation, which occurs in glycolysis and the citric acid cycle, involves the direct phosphorylation of ADP. This process uses the free energy released from a coupled reaction. On the other hand, oxidative phosphorylation harvests the energy from the proton gradient of the mitochondria.
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Which two atoms are isotopes of each other? A. Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. B. Mg with a mass number of 24 and an atomic number 12, and Al with a mass number 24 and an atomic number 13. C. Mg with a mass number 24 and an atomic number 12, Mg with a mass number 25 and an atomic number 12. D. Na with a mass number 23 and an atomic number 11, Mg with a mass number 25 and an atomic number 12.
The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.
What are isotopes?Isotopes are atoms with the same number of protons but differing numbers of neutrons.
They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.
An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.
However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.
They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.
Thus, the correct option is A.
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Write the Net Ionic Equation for the following equations. Molecular Equation: 2AgNO3(aq) + CaBr2(aq) → Ca(NO3)2(aq) + 2AgBr(s) Ionic Equation: 2Ag+(aq) + 2NO3−(aq) + Ca2+(aq) + 2Br−(aq) → Ca2+(aq) + 2NO3−(aq) + 2AgBr(s)
Net Ionic Equation: 2Ag+(aq) + Ca₂ +(aq) + 2Br⁻(aq) → 2AgBr(s)
Net Ionic Formula
A chemical equation for a process called a net ionic equation only includes the species that are involved in the reaction. The spectator ions, which pass through the process unaltered, are not listed.
In this question the steps for this process are as follows:
Step 1: Write out the molecular equation.
2AgNO₃ (aq) + CaBr₂ (aq) → Ca(NO₃)₂ (aq) + 2AgBr (s)
Step 2: Balance the equation.
2AgNO₃ (aq) + CaBr₂ (aq) → Ca(NO₃)₂ (aq) + 2AgBr (s)
Step 3: Write out the ionic equation.
2Ag+ (aq) + 2NO₃⁻ (aq) + Ca₂+ (aq) + 2Br ⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2AgBr (s)
Step 4: Simplify the equation by cancelling out the species that are on both sides of the equation.
2Ag+ (aq) + Ca₂+ (aq) + 2Br⁻ (aq) → 2AgBr (s)
Step 5: The net ionic equation is the final result.
Net Ionic Equation: 2Ag+ (aq) + Ca₂+ (aq) + 2Br ⁻ (aq) → 2AgBr (s)
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How many liters of N2 gas at STP are in a deployed car airbag whose N2 gas masses at 43.8 g?
PLEASE HELP
Answer:
490.87 L
Explanation:
Molar mass of N2 = (1 x 2) = 2 g
Moles of N2 in the airbag = 43.8/2 = 21.9 moles
One mole of any gas occupies a volume of 22.414 L at S.T.P
setting up ratio between moles and volume;
moles : volume
1 : 22.414
21.9 : X
X = (21.9 x 22.414)
= 490.87 L
Make two molecules of water without any leftovers, what is the result?
To create molecules, atoms combine. Two hydrogen (H) atoms and one oxygen (O) atom make up a water molecule's three atoms. H2O is a common abbreviation for water because of this.
EXAMPLES OF MOLECULES AND WHAT A MOLECULE IS:The smallest unit of a material that keeps its content and characteristics is a molecule, which is made up of two or more atoms linked together by chemical bonds. The building blocks of chemistry are molecules.
What exactly are fundamental molecules?The phrase "the molecules of life" frequently refers to these four categories of molecules. Proteins, carbohydrates, lipids, and nucleic acids make up the four basic building blocks of life. Every single life on Earth depends on one or more of the four categories. These four molecules are necessary for a cell and an organism to exist.
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an ion of platinum has a mass number of 195 and contains 74 electrons. How many
protons and neutrons does it contain, and what is its charge?
ompound
Answer:
djffffffffffffffffffffffffffffffffffffffffffffffffffffffffffgk
Explanation:
jdrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
What is the product of the unbalanced equation below?
Ca(s) + O2(g)
A. CaO2(5)
B. Cao(s)
C. 2Ca(s) + O2(9)
D. Ca20(s)
B. Cao(s) (Calcium oxide)
The balanced equation would be:
Ca(s) + O2(g) --> Cao(s)
It is the product of Calcium oxide.
What is the product of the reaction between sodium and chlorine?The product of the reaction between sodium and chlorine is sodium chloride (NaCl). When sodium (Na) and chlorine (Cl) react, they form an ionic bond, with the sodium atom losing one electron to the chlorine atom. This forms a positively charged sodium ion (Na+) and a negatively charged chloride ion (Cl-), which are held together by electrostatic attraction to form the compound sodium chloride. It is a white crystalline solid and is commonly known as table salt.
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Sherman suggests that reproduction always creates individuals with adaptive traits. Does this seem correct? Why or why not?
If Sherman suggests that reproduction always creates individuals with adaptive traits, then he/she is not correct because variation may lead to non-adaptive phenotypes.
What is the presence of genetic variation in individuals of a given population?The presence of genetic variation in individuals of a given population is not adaptive per se, but instead, it provides the raw material for natural selection that leads to the differential survival and reproduction of the most adaptive phenotypes.
The genetic variation in individuals of a given population does not crate adaptive traits and it may derive from sexual reproduction.
Therefore, with this data, we can see that the presence of genetic variation in individuals of a given population may or not be adaptive in the function of the environment in which the individual produced by means of sexual reproduction is developed and therefore it is an advantage for the population but the individual may be harmful.
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calculate the change in enthalpy for the chlorination of propane
A thermodynamic system's property called enthalpy is the result of adding the internal energy of the system and the product of its pressure and volume.
How is the change in enthalpy Illustrated?The change in enthalpy for a chemical reaction, also known as the heat of reaction or delta H, is the amount of heat absorbed or released during the reaction at a constant pressure. To calculate the change in enthalpy for the chlorination of propane, you would need to know the enthalpies of formation for the reactants and products, and use the following equation:
ΔH = ΣΔHf (products) - ΣΔHf (reactants)
Where ΔHf is the enthalpy of formation for a given substance.
Without knowing the specific conditions and reactants, it's not possible to give a exact delta H value for the chlorination of propane. But it's an exothermic process, meaning that heat is released during the reaction. The magnitude of the heat released will depend on the specific reactants and conditions used.
Note that an overview was given as the information is incomplete.
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Explain how you would create a Lewis dot diagram for the following: (1 mark each, 4 marks total) Example: When creating a Lewis Dot diagram for carbon I would look at the periodic table of elements and find that the atomic number is 6. Then I would draw the C. I know that two electrons would go in the first orbit. That leaves 4 electrons in the valence shell. So, the Lewis Dot diagram would look like a C with four dots around it.
a) phosphorus atom
b) chlorine ion
c) beryllium atom
d) calcium ion
a) phosphorus atom - This would have three concentric circles with the outermost circle having five electrons.
b) chlorine ion - This would have three concentric circles with the outermost circle having seven electrons.
c) beryllium atom - This would have two concentric circles with the outermost circle having two electrons
d) calcium ion - This would have four concentric circles with the outermost circle having two electrons.
What is the Lewis dot diagram?We know that the Lewis dot diagram is the kind of representation that can be used to show the number of the electrons that we do have in an element. The number of atoms are shown in electrons that are in the orbits and the orbits are concentric circles that look very similar.
Recall that the orbits that we have in the atom are known to be arranged in energy levels and the energy levels of the atoms of the atoms of the elements play a key role in the Lewis dot structure of the elements that we know.
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Please help with the following problem attached!!
2.27x1022 molecules of CH4 contains 2.27x1022 moles of CH4 and 8.9x1022 moles of hydrogen atoms.
What is hydrogen atoms?Hydrogen atoms are the simplest atoms, consisting of a single proton and electron. They are the smallest and most abundant atoms in the universe, making up about 75% of all matter. Hydrogen atoms are also the most reactive elements, easily combining with other elements to form molecules, such as water. They are an essential part of many biochemical reactions, and are used in fuel cells to generate electricity. Hydrogen atoms are also important in astronomy, as they are a key component of stars and other cosmic bodies. Hydrogen atoms are also a major component of the Earth's atmosphere, making up about 20% of the air we breathe. In summary, hydrogen atoms are a vital part of the universe and are essential to life as we know it.
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What mass of NaNO3 should be dissolved in 400 g of water to prepare a 20% solution?
Mass of NaNO3 should be dissolved in 400 g of water is 100 g
It is given that
Mass of water = 400 g
percent of solution = 20% solution
mass of NaNO3 = ?
Mass per cent is a way of expressing a concentration or describing the component in a particular mixture. The solution composition can be described in mass percentage which shows the mass of solute present in a given mass of solution. The quantity of solute is expressed in mass or by moles.
Mass percentage of solution = mass of solute/mass of solution
20% = mass of NaNO3/mass of NaNO3 + 400g
20/100 = x/x + 400
0.2(x + 400) = x
0.2x + 80 = x
0.8x = 80
x = 100 g
Hence, Mass of NaNO3 should be dissolved in 400 g of water is 100 g
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hydrogen and oxygen reacts chemically to form water. how much water would form if 14.8 grams of hydrogen reacted with 34.8 grams of oxygen
The mass of water that can be obtained is 2.2 g of water.
What is the mass of the water?We know that in the case that we have here, we are going to depend on the stoichiometry of the reaction and this is very important in the determination of the amount of the water that can be formed.
Now we can see that the reaction equation can be written from the fact that; [tex]2H_{2} (g) + O_{2} (g) ---- > 2H_{2} O(g)[/tex]. Then we can see that in this kind of chemical reaction we have to apply the stoichiometry.
Number of moles of the hydrogen = 14.8g/2 g/mol = 7.4 moles
Number of moles of oxygen = 34.8 g/32 g/mol = 1.1 moles
Given that 2 moles of hydrogen reacts with 1 mole of oxygen
7.4 moles of hydrogen reacts with 7.4 * 1/2
= 3.7 moles
Hence oxygen is the limiting reactant.
1 mole of oxygen produces 2 moles of water
1.1 moles of oxygen would produce 1.1 * 2/1
= 2.2 moles of water
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(ii) At what velocity should a 1:30 scale model be towed through water if the Froude number is to be the same for the model and prototype? [6 marks]
The velocity of the prototype should be (Fr x √(g x (1:30L))).
What is prototype?Prototype is a preliminary version of a product or system that is used to test features, functionality, and design before a final version is released. It is a way to quickly and cheaply test ideas, evaluate feedback, and provide proof-of-concept for a product or system.
The Froude number for the model and prototype is given by the equation, Fr = V/√(gL), where V is the velocity, g is the acceleration due to gravity, and L is the length of the prototype. For the model, V is 1:30 times the velocity of the prototype.
Therefore, the velocity of the prototype, Vp, can be calculated as:
Vp = (Vm x 30)/1
= (Fr x √(gL)) x 30/1
= (Fr x √(g x (1:30L)))
Where Vm is the velocity of the model and L is the length of the prototype.
Therefore, the velocity of the prototype should be (Fr x √(g x (1:30L))).
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In the Forest Ecosystem Gizmo that was part of this OMS lesson, how did removing bears affect the deer population?
During the first 20 years, the population of deer decreased.
During the first 20 years, the population of deer stayed the same
During the first 20 years, the population of deer increased.
During the first 20 years, the population of deer changed drastically each year
option (C) During the first 20 years, the population of deer increased.
what is population ?In common parlance, a population is a distinct group of people who share a common citizenship, identity, or set of traits. A population is a sampling that is typical of a broader group of individuals (or even objects) that share one or more characteristics.
what is Ecosystem?The entire group of organisms and the natural setting in which they live together make up an ecosystem. Through nutrient cycles and energy exchanges, these biotic and abiotic elements are interconnected. Through photosynthesis, energy enters the system and is absorbed into plant tissue.
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Which labelled part is responsible for the ability of metals to be bent and shaped?
The majority of metals are malleable, meaning they can be bent and moulded without breaking.
define moulding ?
architect a shaped outline, especially one used on cornices, etc.
a formed strip of wood, stone, or other material
a moulded item, a decorative recessed or relieved surface, a decorative plane or curved strip for embellishment or finishing
The majority of metals are malleable, meaning they can be bent and moulded without breaking. This is due to the fact that they are made up of layers of ions that can glide over one another when the metal is twisted, hammered, or pushed. Most metals are ductile because the ions slide over one other and may be drawn/pulled into wires, making them excellent for electric cables.
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50 cm³ of 0.50 M sulphuric acid is added to 50 cm³ of 0.10 M sodium hydroxide in a calorimeter. A maximum rise in temperature of 6.8 °C is observed.
a. Calculate the standard enthalpy of neutralization of sulphuric acid and sodium hydroxide. (Ans: −57.12 kJ mol−1)
b. Give reason why the value obtained in (a) is less than the expected value.
Answer:
a. To calculate the standard enthalpy of neutralization of sulphuric acid and sodium hydroxide, we can use the formula:
ΔH_neutralization = q_calorimeter / n_reactant
where q_calorimeter is the heat absorbed or released by the solution and n_reactant is the number of moles of reactant.
First, we need to calculate the heat absorbed or released by the solution using the equation:
q_calorimeter = mcΔT
where m is the mass of the solution, c is the specific heat capacity of the solution and ΔT is the change in temperature.
In this case, the mass of the solution is 50 cm³ + 50 cm³ = 100 cm³. The specific heat capacity of the solution is approximately 4.18 J/g°C. The change in temperature is 6.8°C.
q_calorimeter = (100 cm³) (4.18 J/g°C) (6.8°C) = 28.624 J
Then we need to calculate the number of moles of reactant used. The acid is sulfuric acid and the base is sodium hydroxide.
H2SO4 + 2NaOH -> Na2SO4 + 2H2O
The balanced equation shows that 1 mole of H2SO4 reacts with 2 moles of NaOH.
n_reactant = (50 cm³)(0.50 M) + (50 cm³)(0.10 M) = 2.5 moles
Therefore, the standard enthalpy of neutralization of sulphuric acid and sodium hydroxide is:
ΔH_neutralization = q_calorimeter / n_reactant = (28.624 J) / (2.5 moles) = -11.4496 kJ/mol
b. The value obtained in (a) is less than the expected value because heat exchange occurs between the reaction mixture and the calorimeter, which causes a loss of energy. Additionally, the solution may not have been perfectly insulated and heat may have been lost to the surroundings, also causing a loss of energy. Furthermore, the reaction may not have been performed under standard conditions, such as at a specific temperature or pressure.
what are the two terms in the sequence 16,13,10
Answer:
Explanation:
The two terms in the sequence are 16 and 13.
Which examples are an abiotic factor of an aquarium ecosystem? Select all that apply.
rock structure
amount of algae on the glass
temperature of the water
number of fish
Answer:
a. amount of algae on the glass
Explanation:
Physical and chemical circumstances are examples of abiotic elements, which are ecosystem components that are not alive. Because they are non-living and affect the ecosystem's characteristics, the rock composition, the quantity of algae on the glass, and the water temperature are all examples of abiotic elements in an aquarium environment.
Although the quantity of fish is a biotic element since it is a live organism and a component of the ecosystem.
