Answer:
It is a homogeneous mixture
Which of the following statements about the periodic table is true
1.elements in the same column are similar in their properties
2.elements in the same row are similar in their properties
3.elements that start with the same letter are similar in their properties
4.elements that have the same atomic mass are similar in their properties
Answer: Elements in the same column are similar in their properties
Explanation: The columns on the periodic table are also know as group of the periodic table elements in the same group of the periodic table tends to have similar chemical properties because they all have the same number of valence electrons in their outermost shell. This plays an important roles in their reactivity and properties
Answer:
1. elements in the same column are similar in their properties
Explanation:
I got it right :)
What is the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0oC?
the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0oC at 45°C.
Explanation:
Data given:
initial temperature (T)= 25 degrees Celsius
mass of water = 10 gram
cp of water = 4.2J/gram Celsius
energy absorbed (q) = 840 joules
change in temperature = final temperature(t2) - initial temperature (t1)
so ΔT ( t-25)
Using the equation.
q= mcΔT
putting the values in the equation:
840 = 10 x 4.2 x (t-25)
t -25 = [tex]\frac{840}{10 x 4.2}[/tex]
t = [tex]\frac{840}{10 x 4.2}[/tex] +25
= 45 °C
The final temperature of 10 gram of water which absorbed 840 joules of energy at an initial temperature of 25 degrees and final temperature of 45 degrees.
According to specific heat capacity, the final temperature of water is 45°C.
Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
The given values are ,
Q=840 J
m=10 g
c=4.2 J/g°C
T₁=25°C
Substitution of values in the formula gives,
[tex]840=10\times4.2\times(T_2-25)\\84=4.2 T_2-105\\T_2=\dfrac{84+105}{4.2}\\=45^\circ C[/tex]
Thus, final temperature of water is 45°C.
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In which of the following choices is the oxidation number incorrect?
Cl2(s); oxidation number = 1–
Fe3+(aq); oxidation number = 3+
Ni(s); oxidation number = 0 I–(aq); oxidation number = 1–
Cu+(aq); oxidation number = 1+
Cl2(s); oxidation number 1 is the incorrect choices in oxidation number.
Explanation:
In the elemental form oxidation state is zero. Here chlorine is present in elemental form so oxidation state is zero.
Oxidation number depends on the number of electrons gained or lost by an atom of the element say in compound formation.
If electron is gained oxidation number becomes negative.
If electron is lost then oxidation number is positive.
If the octet rule is fulfilled that valence shell is filled them atomic number gets zero. Since Cl2 is in neutral state the oxidation number is 0.
Oxidation number in general can be made out by checking the valency of the element as oxidation number is also equal to the valency.
Which statement best describes the physical geography of the Italian Peninsula?
It is a flat plain with few hills or mountains.
It is a desert without access to fresh water.
It is a combination of hills, mountains, and plains.
It is mountainous without flat areas for growing crops.
Answer: It is a combination of hills, mountains, and plains
Explanation:
The statement best describes the Italian peninsula, it is a combination of hills, mountains, and plains.
What is the Italian peninsula?It is also known as the Apennines peninsula, and it is extended from the southern Alps to the northern Mediterranean Sea.
It is one of the three greatest peninsulas.
This peninsula was started to be formed in 1861.
Thus, the correct option is C, It is a combination of hills, mountains, and plains.
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Why is it important to reduce coefficients in a balanced equation to the lowest possible whole-number ratio?
Answer:
it is important because in that way chemist can see lowest possible number of reactants in chemical reaction needed to form product of reaction. Coefficients with the lowest ratio indicate the relative amounts of substances in a reaction.
Explanation:
PLEASE HELP FAST IM ABOUT TO FAIL PLEASE HELP PLEASE HELP FAST HELP HELP THIS IS DESPRATE
How many liters of water would be needed to dissolve 21.6 g of lithium nitrate to make a 1.3 M (molar) solution?
What is the molarity of a solution made of 215.1 g of HCl is dissolved to make 2.0 L of solution?
How much concentrated 18 M H[tex]x_{2}[/tex]SO[tex]x_{4}[/tex] is needed to prepare 250.0 mL of a 6.0 M solution?
A chemist has a stock solution of HBr that is 10.0 M and would like to make 450.0 mL of 3.0 M HBr, how would he/she do it?
How much water should be added to 50.0 mL of 12 M hydrochloric acid to make a 4.0 M solution?
Lulu Labwrecker carefully pipeta 25.0 mL of 0.525 M NaOH into a test tube. She places the test tube into a small beaker to keep it from spilling and then pipets 75.0 mL of 0.355 M HCl into another test tube. When Lulu reaches out to put this test tube of acid into the beaker along with test tube of base she accidentally knocks the test tubes together hard enough to break them and their respective contents combine in the bottom of the beaker. Is the solution formed from the contents of the two test tubes acidic or basic? What is the pH of the resulting solution?
1. 0.240 liters of water would be needed to dissolve 21.6 g of lithium nitrate to make a 1.3 M (molar) solution.
2. 2.9 M is the molarity of a solution made of 215.1 g of HCl is dissolved to make 2.0 L of solution.
3.83.3 ml of concentrated 18 M H2SO4 is needed to prepare 250.0 mL of a 6.0 M solution.
4. 135 ml of stock HBr will be required to dilute the solution.
5. 150 ml of water should be added to 50.0 mL of 12 M hydrochloric acid to make a 4.0 M solution
6. The pH of the resulting solution is 13.89
Explanation:
The formula used in solving the problems is
number of moles= [tex]\frac{mass}{atomic mass of one mole}[/tex] 1st equation
molarity = [tex]\frac{number of moles}{volume}[/tex] 2nd equation
Dilution formula
M1V1 = M2V2 3rd equation
1. Data given
mass of Lithium nitrate = 21.6 grams
atomic mass of on emole lithium nitrate = 68.946 gram/mole
Molarity is given as 1.3 M
VOLUME=?
Calculate the number of moles using equation 1
n = [tex]\frac{21.6}{68.946}[/tex]
= 0.313 moles of lithium nitrate.
volume is calculated by applying equation 2.
volume = [tex]\frac{0.313}{1.3}[/tex]
= 0.240 litres of water will be used.
2. Data given:
mass of HCl = 215.1 gram
atomic mass of HCl = 36.46 gram/mole
volume = 2 litres
molarity = ?
using equation 1 number of moles calculated
number of moles = [tex]\frac{215.1}{36.46}[/tex]
number of moles of HCl = 5.899 moles
molarity is calculated by using equation 2
M = [tex]\frac{5.899}{2}[/tex]
= 2.9 M is the molarity of the solution of 2 litre HCl.
3. data given:
molarity of H2SO4 = 18 M
Solution to be made 250 ml of 6 M
USING EQUATION 3
18 x V1= 250 x 6
V1 = 83.3 ml of concentrated 18 M H2SO4 will be required.
4. data given:
M1= 10M, V1 =?, M2= 3 ,V2= 450 ml
applying the equation 3
10 x VI = 3x 450
V1 = 135 ml of stock HBr will be required.
5. Data given:
V1 = 50 ml
M1= 12 M
V2=?
M2= 4
applying the equation 3
50 x 12 = 4 x v2
V2 = 150 ml.
6. data given:
HCl + NaOH ⇒ NaCl + H20
molarity of NaOH = 0.525 M
volume of NaOH = 25 ml
molarity of acid HCl= 75 ml
volume of HCl = 0.335 ml
pH=?
Number of moles of NaOH and HCl is calculated by using equation 1 and converting volume in litres
moles of NaOH = 0.0131
moles of HCl= 0.025 moles
The ratio of moles is 1:1 . To find the unreacted moles of acid and base which does not participated in neutralization so the difference of number of moles of acid minus number of moles of base is taken.
difference of moles = 0.0119 moles ( NaOH moles is more)
Molarity can be calculated by using equation 1 in (25 +75 ml) litre of solution
molarity = [tex]\frac{0.0119}{0.1}[/tex]
= 0.11 M (pOH Concentration)
14 = pH + pOH
pH = 14 - 0.11
pH = 13.89
Calculate the pH of KC2H3O2 solution. Ka for HC2H3O2 is 1.8x10-5
Answer:
The pH value comes out to be 9.03. We will get an alkaline solution by the hydrolysis of the salt of a weak acid and a strong base.
Explanation:
[tex]KC_{2}H_{3}O_{2}[/tex] is a salt of a weak acid acetic acid and a strong base KOH. This salt will hydrolyze in water to give an alkaline solution.
Assuming concentration (C) of the salt to be 0.2 M as it is not given.
[tex]K_{a}[/tex] of acetic acid = [tex]1.8\times 10^{-5}[/tex]
[tex]\textrm{pK}_{a} = -\textrm{ log}\left ( K_{a} \right ) \\\textrm{pK}_{a} = -\textrm{ log}\left ( 1.8\times 10^{-5} \right ) \\\textrm{pK}_{a} = 4.75[/tex]
The formula of pH on hydrolysis of salt of weak acid and strong base is given below
[tex]pH = \displaystyle \frac{1}{2}\left ( pK_{w}+pK_{a}+\textrm{log}C \right ) \\pH = \displaystyle \frac{1}{2} \left ( 14+4.75+\textrm{log}0.2 \right ) \\pH = 9.03[/tex]
The pH of solution comes out to be 9.03
To calculate the pH of a KC2H3O2 solution, determine the Kb of the acetate ion using the provided Ka for acetic acid and then calculate the concentration of hydroxide ions to finally find the pH of the solution through the formula pH = -log[H+].
Explanation:Calculating the pH of a KC2H3O2 SolutionTo calculate the pH of a potassium acetate (KC2H3O2) solution, we must first understand the relationship between the acid dissociation constant (Ka) of acetic acid (HC2H3O2) and the base dissociation constant (Kb) of its conjugate base, the acetate ion (C2H3O2-). Using the formula Kw = Ka × Kb, where Kw is the ion-product constant for water (1.0 × 10^-14 at 25°C), we can calculate Kb with the given Ka for acetic acid (1.8 × 10^-5).
First, solve for Kb:
Kb = Kw / Ka
Kb = (1.0 × 10^-14) / (1.8 × 10^-5)
Kb = 5.56 × 10^-10
Knowing the Kb value, we can then use the given concentration of the KC2H3O2 solution to find the hydroxide ion concentration [OH-] and subsequently the hydrogen ion concentration [H+]. The pH is then calculated using the formula pH = -log[H+]. The complete solution would include detailed calculations of [OH-], [H+], and pH, factoring in the initial concentration of the KC2H3O2 solution.
what are the six scientific method in order?
conclusion, observation, experiment, problem, hypothesis, results..
Chocolate Chip Cookie Recipe: 1 cup of flour 100 chocolate chips 1 cup sugar 1/2 cup milk Yields 10 cookies You and your sister want to bake chocolate chip cookies. You go to the store and buy 5 cups of flour, three bags of chips, each containing 100 chocolate chips, 6 cups of sugar, and a half gallon of milk. You want to make as many cookies as possible. What is your limiting reactant, the ingredient that would run out first?
The first ingredient to run out would be the chocolate chips.
Limiting ReactantsA limiting reactant is a reactant that determines the amount of product that would be formed in a reaction.
In this scenario, the ratio of flower to chocolate chips to sugar to milk for a 100 cookies is 1:100:1:0.5.
The ratio of the same ingredients bought in the store is 5:300:6:16
Note: 16 cups = a gallon
To the lowest ratio: 5:300:6:16 = 1:60:1.2:3.02
Since the ratio of flour to chocolate chips is 1:100, it means that the chocolate chips would be the first to run out first and thus, the limiting reactant.
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I have attached all the problems, but really if you just do one so I understand how to do it, that would be great!
Perform the following heat calculations. You must show all work and include units on answers to receive full credit.
a. How much heat is required to raise the temperature of 10.0 g of iron from 25°C to 100.°C? The specific heat capacity of iron is 0.46 J/g°C.
b. The specific heat capacity of water is 4.184 J/g°C. How much heat is required to heat 500.0 g of water from 50.0°C to 100.°C?
c. A 45.4 g sample of lithium is cooled from 250.0°C to 25.0°C. The specific heat capacity of lithium is 3.56 J/g°C, what amount of heat is released?
d. How many kilojoules of heat are released when 0.72 mole of oxygen gas are used to combust methane?
CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (ℓ) + 890kJ
e. How much heat is released when 1.4 mol of hydrogen fluoride are produced?
H2 (g) + F2 (g) → 2HF (g) + 536kJ
Answer:
Answer of question a is 345J.
Explanation:
In question a following is given in data:
-mass of iron (m) = 10.0 g
-temperature (ΔT) = final temperature- initial temperature= 100-25= 75 degree Celsius
-Specific Heat capacity of iron (c)= 0.46J/g°C.
Heat (Q)=?
Solution:
Formula for Heat is :
Q=m x c x ΔT
Q= 10 x 0.46 x 75
Q= 345 J.
so, 345 joules of heat is needed to increase the temperature of 10 grams of iron.
From the above formula all other questions can easily be solved from the same procedure.To find the amount of heat required or released, use the formula q = m × c × ΔT, applying the given values for mass, specific heat capacity, and temperature change.
Explanation:To solve the heat calculation problems, we use the formula q = m × c × ΔT, where q is the heat absorbed or released, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature (final temperature minus initial temperature).
For example, to calculate how much heat is required to raise the temperature of 10.0 g of iron from 25°C to 100.0°C, given that the specific heat capacity of iron is 0.46 J/g°C, we apply the formula: q = (10.0 g) × (0.46 J/g°C) × (100.0°C - 25°C). Calculating this gives q = 345 J, meaning 345 Joules of heat is required.
What is bond length?
Answer:
Bond length or bond distance is defined as the average distance between nuclei of two bonded atoms in a molecule.
Explanation:
Answer:
In molecular geometry, bond length or bond distance is defined as the average distance between nuclei of two bonded atoms in a molecule.
Explanation:
It is a transferable property of a bond between atoms of fixed types, relatively independent of the rest of the molecule.
What are two factors that can affect salinity?
Answer:
precipitation and evaporation
Explanation:
salinity :salt concentration
Precipitation: this brings freshwater into the ocean which are not salty, so it is diluting its salt concentration.
evaporation: takes all the water and leaves the salt behind
Mg+2N=??
complete and balance it
Answer:
mg3n2
Explanation:
Answer:
3Mg + N2 —> Mg3N2
Explanation:
The reaction between Mg and N2 is given below:
Mg + N2 —> Mg3N2
Now let us balance the equation:
There are 3 atoms of Mg on the right side and 1atom on the left side. It can be balance by putting 3 in front of Mg as shown below:
3Mg + N2 —> Mg3N2
Now the equation is balanced
The volume of 350 mL of gas at 25°C is decreased to 135mL at constant pressure. what is the final temperature of the gas?
The decrease in the volume of gas at constant pressure results in the final temperature of the gas is 115.05 K.
The Charles law states that with the gas constant pressure there has been a proportional relationship between the volume and temperature.
At constant pressure, the relationship between the temperature and volume can be given by:
[tex]\rm \dfrac{Initial\;volume}{\Initial\;Temperature}\;=\;\dfrac{Final\;Volume}{Final\;Temperature}[/tex]
For the given gas, the final temperature can be calculated as:
[tex]\rm \dfrac{350\;ml}{298.15\;K}\;=\;\dfrac{135\;ml}{Final\;temperature}[/tex]
1.173 = [tex]\rm \dfrac{135\;ml}{Final\;temperature}[/tex]
Final temperature = [tex]\rm \dfrac{135\;ml}{1.173\;K}[/tex]
Final temperature = 115.05 K.
The reduction in the volume of gas at constant pressure results in the final temperature of the gas is 115.05 K.
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Using Charles's Law, we can calculate that the final temperature of the gas at constant pressure when its volume is decreased from 350 mL at 25°C to 135 mL is -157.95°C.
Explanation:The student is asking about the relationship between the volume and temperature of a gas held at constant pressure, which can be described using Charles's Law. According to this law, at constant pressure, the volume of a gas is directly proportional to its absolute temperature (measured in Kelvin). To find the final temperature when the volume of 350 mL of gas at 25°C is decreased to 135 mL, we can set up the proportion:
V1 / T1 = V2 / T2
where:
V1 is the initial volume (350 mL)T1 is the initial temperature (25°C or 298 K)V2 is the final volume (135 mL)T2 is the final temperature (in Kelvin)First, we need to convert the initial temperature from Celsius to Kelvin by adding 273.15 (T1 in Kelvin is 298.15 K). Then we can solve for T2:
(350 mL / 298 K) = (135 mL / T2)
Multiplying both sides by T2 and then by 298 K, we get:
T2 = (135 mL * 298 K) / 350 mL = 115.2 K
Converting back to Celsius, we subtract 273.15 from 115.2 K to get -157.95°C, which is the final temperature of the gas at constant pressure.
Check all items common to bases.
minerals
metal
gas
H+
OH-
nitrogen
OH- is common to bases.
Explanation:
The base is a is an ionic compounds which when placed in aqueous solution dissociates in to a cation and an anion OH-.
The presence of OH- in the solution shows that the solution is basic or alkaline.
From Bronsted and Lowry concept base is a molecule that accepts a proton for example in NaOH, Na is a proton donor and OH is the proton acceptor.
A base accepts hydrogen ion and the concentration of OH is always higher in base.
There is a presence of conjugate acid and conjugate base in the Bronsted and Lowry acid and base.
Conjugate acid is one which is formed when a base gained a proton.
Conjugate base is one which is formed when an acid looses a proton.
And from the Arrhenius base Theory, the base is one that dissociates in to water as OH-.
Answer:
metal and OH-
Explanation:
A box rests on a table. What forces act on the box?
OA) a pulling force only
O B) a pushing force only
OC) both a pulling and a pushing force
Answer:
c both
Explanation:
the table is pushing up so the pushing force and gravity is the pulling force as its pulling it towards the ground
The coefficients for the equation are:
KClO3 =
KCl +
O2
Answer:
The coefficient of [tex]KClO_{3}[/tex] , KCl and [tex]O_{2}[/tex] are 2, 2 and 3 respectively.
Explanation:
The heating of [tex]KClO_{3}[/tex] to give KCl and oxygen gas is an example of decomposition reaction.
The balanced reaction for the decomposition of [tex]KClO_{3}[/tex] is shown below
[tex]2KClO_{3}\rightarrow 2KCl+3O_{2}[/tex]
The coefficient of [tex]KClO_{3}[/tex] is 2
The coefficient of KCl is 2
The coefficient of [tex]O_{2}[/tex] is 3
Final answer:
In Chemistry, the decomposition of potassium chlorate (KClO₃) is balanced to show that 2 moles of KClO₃ produce 3 moles of O₂. Therefore, 1.65 moles of KClO₃ will produce 2.475 moles of O₂.
Explanation:
The question involves balancing a chemical equation, which is a fundamental concept in Chemistry. You are seeking to find the coefficients for the decomposition of potassium chlorate (KClO₃) into potassium chloride (KCl) and oxygen (O₂). The balanced equation for this decomposition is:
2 KClO₃(s) 2 KCl(s) + 3 O₂(g)
According to the stoichiometry, 2 moles of KClO₃ produce 2 moles of KCl and 3 moles of O₂. Thus, 1.65 moles of KClO3 will produce:
1.65 moles KClO₃ x (3 moles O₂ / 2 moles KClO₃) = 2.475 moles O₂
Answer: 2.475 moles of O₂ will be formed from 1.65 moles of KClO₃.
what is a solution
A. Two liquids that do not mix with each other
B.The substance that is dissolved in another substance
C.The mixture of one substance dissolved in another
D. the substance that dissolves another substance
what is metamorphosis ? explain
Explanation:
nounZOOLOGY
(in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages
Answer: Metamorphosis is a process of the life cycle where an organism develops certain changes in its physical body.
Explanation: An example is the development of a cocoon to a larva changed into a pupa and finally into a butterfly.
A barcode can be printed on a product to help identify the product. A barcode usually consists of several alternating vertical black and white lines of various widths. A barcode scanner is used to read the information stored in a barcode. The barcode scanner projects a beam of light on the barcode. The light that reflects from the barcode is decoded to give information about the product.
Which of the following processes enables the scanner to decode the information from the barcode?
A:The projected light from the scanner is absorbed by the black lines and reflected by the white lines of the barcode, which creates a pattern on the optical sensor of the scanner.
B:The projected light from the scanner is refracted by the lines on the barcode, which changes the speed of the light hitting the optical sensor of the scanner.
C:The projected light from the scanner interferes with the reflected light from the barcode, and this combined beam of light is recognized by the optical sensor of the scanner.
D:The projected light from the scanner is diffracted by the barcode, which creates a pattern on the optical sensor of the scanner.
Answer:
A
Explanation:
The barcode is being read by a laser that scans along the length of the sequence, reflecting more light from the white strips and less from the black strips. Hope this helps!
Answer:
The Answer is A
Explanation:
Had it before
solar panels use which of the following energy sources to generate electricity?
Sunlight/light from the sun
10. Blood which is flung off of swinging objects creates which type of spatter?
A. Arterial spray
B. Expirated
C. Cast-off
D. Void
Answer:
I'm pretty sure it's B
Explanation:
Blood flung off swinging objects creates a type of spatter known as cast-off, different from arterial spray, expirated blood patterns, or void patterns. Option C is correct.
Blood that is flung off of swinging objects creates a type of spatter known as cast-off. This typically occurs when blood on an object, such as a weapon, is flung into the surrounding area when the object is quickly swung or moved.
It can be distinguished from other types of spatter, such as arterial spray, which is characterized by the pulsating pattern of blood that spurts out with each heartbeat, or expirated blood patterns, which are caused by blood that is expelled from the mouth or nose from an internal injury. Void patterns occur when an object blocks the deposition of blood spatter onto a surface or object, creating a blank space within the bloodstained area.
Hence, C. is the correct option.
What was role of early genetic engineering for animal
Role of early genetic engineering for animal
Explanation:
Genetic engineering is the process of artificial alteration or manipulation of the original genetic makeup of an organism and then modification and recombination using technologies like the DNA recombinant technology.
Early genetic engineering began with expressing specific bacterial genes by Cohen in 1973. Later due to various anxieties arising about hazardous reshaping of genetic systems, it came to a slowdown.
Then all these anxieties were subdued with the advent of DNA recombinant plasmid-based technology which was very helpful to understand the molecular genetic mechanisms in animals.
In animals genetic engineering is mainly used to find genes responsible for beneficial traits or characters introduce them into another animal’s genome and create a new offspring with the beneficial character.
The first animal which was created by genetic engineering was a mouse by Rudolf Jaenisch in 1974. Later many transgenic animals were developed like chicken, mice, cattle, sheep, pig etc.
Which of the following tend to possess the same number of outer electrons? A. all molecules with the same number of atoms B. all elements within the same group C. all molecules made up of the same elements D. all elements within the same period
Answer:
the answer would be "B"
Explanation:
Elements with the same number of valence electrons are found in the same column of the Periodic Table. All elements in the first column of the Periodic Table have 1 valence electron in an s orbital. These elements are known as Group 1A metals or alkali metals.
All elements within the same group tend to possess the same number of outer electrons and the correct option is option B.
What are Groups in Periodic table?The periodic table is organized into groups (vertical columns), periods (horizontal rows), and families (groups of elements that are similar). Elements in the same group have the same number of valence electrons.
Meanwhile, elements in the same period have the same number of occupied electron shells.
Elements are typically classified as either a metal or nonmetal.
Metal elements are usually good conductors of electricity and heat. The subgroups within the metals are based on the similar characteristics and chemical properties of these collections
Therefore, All elements within the same group tend to possess the same number of outer electrons and the correct option is option B.
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Please answer for me
Answer:
1. Nitric Acid
2. Hydrochloric Acid
3. Acetic Acid
4. Hydrogen bromide
5. Nitrous Acid
Explanation:
1. H2SO4
2. HF
3. H3PO4
4. H2CO3
5. H2S
P.S. make the numbers smaller ok?
Show Your Work
2SO3(g) -> 2SO2(g)+O2(g)
Calculate Keq for this reaction if the equalibrium concentrations are: |SO2|=0.42M; |O2|=0.21M; |SO3|=0.072M
Answer:
The equilibrium constant for the reaction comes out to be 7.145
Explanation:
Given concentration of all the species at equilibrium are shown below
[tex]\left [ SO_{2} \right ] = 0.42 \textrm{ M}, \left [ O_{2} \right ] = 0.21 \textrm{ M}, \left [ SO_{3} \right ] = 0.072 \textrm{ M}[/tex] \\
Given reaction is shown below
[tex]2\textrm{SO}_{3}\left ( g \right )\rightleftharpoons 2\textrm{SO}_{2}\left ( g \right )+\textrm{O}_{2}\left ( g \right )[/tex]
[tex]K_{eq} = \displaystyle \frac{\left [ SO_{2} \right ]^{2}\times \left [ O_{2} \right ]}{\left [ SO_{3} \right ]^{2}} \\K_{eq} = \displaystyle \frac{\left ( 0.42 \right )^{2}\times 0.21}{\left ( 0.072 \right )^{2}} \\K_{eq} = 7.145[/tex]
[tex]K_{eq}[/tex] for the reaction is 7.145
The equilibrium constant (Keq) for the reaction 2SO3(g) -> 2SO2(g) + O2(g) is calculated using the equilibrium concentrations of the reactants and products and the formula Keq = ([SO2]^2 * [O2]) / ([SO3]^2), yielding an approximate value of 7.15.
The student is asking how to calculate the equilibrium constant (Keq), also referred to as the equilibrium constant Kc, for the reverse reaction 2SO3(g) -> 2SO2(g) + O2(g) given the equilibrium concentrations of the reactants and products. To calculate Keq, we use the following equilibrium expression:
Keq = ([SO2]^2 * [O2]) / ([SO3]^2)
Substituting the equilibrium concentrations into the expression gives:
Keq = (0.422 * 0.21) / (0.0722)
Keq = (0.1764 * 0.21) / (0.005184)
Keq = 0.037044 / 0.005184
Keq = 7.146 (rounded to three significant figures)
Therefore, the value of the equilibrium constant (Keq) for the reaction 2SO3(g) -> 2SO2(g) + O2(g) is approximately 7.15.
What change in volume results if 60 mL of a gas is cooled from 33 C to 5 C?
Answer:
Change in volume on changing temperature from 33[tex]^{\circ}C[/tex] to 5[tex]^{\circ}C[/tex] is 5.49 mL
Explanation:
Initial volume of gas = V = 60 mL
Assuming final volume of gas to be V' mL
Initial temperature = T = 33[tex]^{\circ}C[/tex] = 306 K
Final temperature = T' = 5[tex]^{\circ}C[/tex] = 278 K
The relationship between volume and temperature of gas at constant pressure is shown below
[tex]\displaystyle \frac{V}{V'}=\displaystyle \frac{T}{T'} \\\displaystyle \frac{60\textrm{ mL}}{V'} = \displaystyle \frac{306\textrm{ K}}{T} \\V' = 54.51 \textrm{ mL} \\\textrm{Change in volume} = \left ( V-V' \right ) \\\textrm{Change in volume} = \left ( 60-54.51 \right )\textrm{ mL} \\\textrm{Change in volume} = 5.49 \textrm{ mL}[/tex]
Change in volume on changing temperature = 5.49 mL
What is the term for substances that prevent drastic changes in pH
Answer:
It is termed a buffering agent
Explanation:
A buffering agent consist of a weak acid and a base that is used to maintain the acidity of a solution after the addition of
another acid or base
A buffer is used to prevent any rapid change in ph
If we increase the temperature of the tank to 85C, what will the new pressure be inside the tank?
Answer:
The new pressure will increase.
Explanation:
If the temperature in a tank increases, the pressure inside the tank will also increase. This is one of the postulates of the general gas law.
Pressure exerted by a gas is it's force per unit area.
When we reduce the equation of the combined gas law taking the number of moles to be 1, we see that;"at constant volume, the pressure of a given mass or mole of gas varies directly with the absolute temperature" .
The higher the pressure, the higher the temperature will be.
Since the complete parameters are not given, use this expression below:
[tex]\frac{P_{1} }{T_{1} } = \frac{P_{2} }{T_{2} }[/tex]
where P and T are pressure and temperature
1 and 2 represents initial and final states.
The new pressure in the tank when the temperature is increased to 85°C can be calculated using Charles's Law, which requires converting temperatures to Kelvin and then applying the formula P1/T1 = P2/T2.
Explanation:To calculate the new pressure in the tank when the temperature is increased to 85°C, we can apply Charles's Law, which states that for a fixed amount of gas at constant volume, the pressure is directly proportional to its temperature in Kelvin. This implies that if the temperature increases, the pressure will also increase proportionally. To find the new pressure P₂, we use the equation P₁/T₁ = P₂/T₂, where P₁ is the initial pressure, T₁ is the initial temperature, P₂ is the final pressure, and T₂ is the final temperature.
For example, if a gas tank has an initial pressure P₁ of 1.0 atm at a temperature of 20°C (which is 293.15 K when converted to Kelvin), and the temperature is increased to 85°C (358.15 K in Kelvin), the new pressure P₂ can be calculated as follows:
P₂ = P₁ × (T₂ / T₁)
P₂ = 1.0 atm × (358.15 K / 293.15 K)
P₂ would then be calculated to find the pressure at the higher temperature.
Which structure of the cell controls what goes in and comes out of the cell? cell Which structure is a strong layer around plant cells? cell
Answer:
Cell membrane
Cellulose cell wall
Explanation:
The cell membrane is the structure that contains what goes in out of a cell. It is made up of double phospholipid layers.
This cell membrane is also known as the plasma membrane. It is found in both plants and animal cells.
They regulate the movement of materials in and out of the cell. They also provide structural support.
The cellulose cell well is a strong layer found in most plant cells. They are not found in animal cells. These structures are found just outside of the cell membrane in plants. They provide additional support for the cell They are rigid and not flexible.
Answer: 1: membrane 2: wall
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