Given :
If a certain gas occupies a volume of 12 LL when the applied pressure is 6.0 atm.
To Find :
The pressure when the gas occupies a volume of 3.0 LL .
Solution :
Since, their is no information of temperature, let us assume it is constant throughout the process.
We know, by ideal gas equation at constant temperature :
[tex]\alpha P_1V_1 = P_2V_2\\\\6 \times 12 = P_2 \times 3\\\\P_2 = 24\ atm[/tex]
Therefore, the pressure when the gas occupies a volume of 3.0 LL is 24 atm.
A diagram representing the levels of organization within an organism is shown below.
Х
-5-
Which level of organization is dentified by X?
(1) cell
(2) tissue
(3) organ
(4) organ system
A diagram representing the levels of organization within an organism is X. The level of organization is identified by X is tissue. Therefore, option 2 is correct.
What is tissue ?The term "tissue" refers to a collection of cells or fluid that cooperate to carry out a particular function in the body. Examples of such cells include those found in the kidney, heart, or blood cells, which transport oxygen to and waste products away from the body's cells.
The Old French term tissue, which means "a ribbon, belt, or piece of woven stuff," is where the noun tissue originates. Tissue really means to "weave fabric strands" as a verb. Tissues are now thought of as the disposable paper used for packaging presents or blowing our noses.
They stand for a degree of cell differentiation and order in living things. The activities of tissues include respiration, digesting, and transportation. As a result, tissues are crucial for multicellular creatures.
Thus, option 2 is correct.
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A student dissolved 3.50g of copper (II) nitrate in water and mixed it with a solution of sodium carbonate. The student recovered 1.89g of copper carbonate precipitate. If the theoretical yield is 2.35g, what is the percent yield
Answer: If the theoretical yield is 2.35g then the percent yield is 80.4%
Explanation:
Given: Actual yield = 1.89 g
Theoretical yield = 2.35 g
Formula used to calculate the percentage yield is as follows.
[tex]Percent yield = \frac{actual yield}{theoretical yield} \times 100[/tex]
Substitute the values into above formula as follows.
[tex]Percent yield = \frac{actual yield}{theoretical yield} \times 100\\= \frac{1.89}{2.35} \times 100\\= 80.4 percent[/tex]
Thus, we can conclude that if the theoretical yield is 2.35g then the percent yield is 80.4%
the coal sample being used in this experiment is assumed to have 3% sulfur in its composition. what percent of sulfate is present in the coal samples
Answer: The percent of sulfate is present in the coal samples is 0.999%.
Explanation:
Given: Percentage of sulfur present = 3%
In [tex]SO^{2-}_{4}[/tex], the percentage by weight of Sulfur is calculated as follows.
[tex]Percentage = \frac{32 g}{32 + 64} \times 100\\= 33.33 percent[/tex]
This means that the amount of only sulfur present in [tex]SO^{2-}_{4}[/tex] in the sample is as follows.
[tex]\frac{3}{100} \times 33.33\\= 0.999 percent[/tex]
Thus, we can conclude that percent of sulfate is present in the coal samples is 0.999%.
Explain the leaf properties of water
Answer:
Water's polarity and its ability to form hydrogen bonds give it special properties, including adhesion, cohesion, and the ability to moderate temperature.
what type of chemical reaction is 2C₄H₁₀ + 13O₂ ---> 8CO₂ + 10H₂O?
Answer:
The answer is a combustion reaction.
Explanation:
This chemical equation is a combustion reaction because [tex]C_{4} H_{10}[/tex] is combining with oxygen, thus releasing a large amount of energy in the form of heat and light.
It is also a combustion reaction because the products of carbon dioxide and water are formed.
which sphere would this be found in?
Answer:
The answer you picked was right.
Explanation:
9 How many grams of O₂ are needed to produce 15.5 g Fe₂O3 in the following reaction? Fe(s) + O₂(g) → Fe₂O3 (s)
Answer:
Explanation:
so u can work out the amount of moles in FeO3 by doing mr of fe3o3 is 55.8*3+16*3=215.4
moles= mass/mr so you do 15.5g/215.4=0.0719 moles
then using 1 to 1 ratio so O2 moles is 0.0719
then use the equation mass=mole*mr
so 0.0719*16=1.15g
hope this make sense :)
What volume of water is required to prepare 0.1 M H3PO4 from 100 ml of 0.5 M solution?
Answer: A volume of 500 mL water is required to prepare 0.1 M [tex]H_{3}PO_{4}[/tex] from 100 ml of 0.5 M solution.
Explanation:
Given: [tex]M_{1}[/tex] = 0.1 M, [tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 0.5 M, [tex]V_{2}[/tex] = 100 mL
Formula used to calculate the volume of water is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.1 M \times V_{1} = 0.5 M \times 100 mL\\V_{1} = 500 mL[/tex]
Thus, we can conclude that a volume of 500 mL water is required to prepare 0.1 M [tex]H_{3}PO_{4}[/tex] from 100 ml of 0.5 M solution.
The graph shows a relationship between volume and temperature. Which of the following statements is true?
A.) The graph shows a directly proportional relationship between volume and temperature and represents Charles' Law.
B.) The graph shows an indirectly proportional relationship between volume and temperature and represents Boyle's Law.
C.) The graph shows an indirectly proportional relationship between volume and temperature and represents Gay-Lussac's Law.
4.) The graph indicates that when temperature is increased, volume decreases.
Answer:
The graph shows a directly proportional relationship between volume and temperature and represents Charles' Law.
Explanation:
The relation between volume and temperature is given by :
Ideal gas law, PV = nRT
Where
P is pressure
V is volume
R is gas constant
T is temperature
As volume and temperature have direct relationship. Charles law states that there is a direct relationship between volume and temperature. The correct option is (a).
Which of a following elements has the Smallest atomic radius 1. Ge 2. SI 3. Carbon 4. Sn
Answer:
carbon
Explanation:
Atomic radius represents the distance from the nucleus to the outer shell of an element.
The element having the Smallest atomic radius is Carbon. Hence. Option (3) is correct
What is Atomic Radius ?The atomic radius of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron.
Atomic Radius Increases down the group.
All the given elements belongs to same group ie, 14th Carbon is the top most element of the group.
Therefore, The element having the Smallest atomic radius is Carbon. Hence. Option (3) is correct
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To form any chemical bond, the following happens:
O A. Two atoms exchange protons between each other
B. Two atoms are mixed together
C. Two atoms share or transfer electrons
O
D. Two compounds are attracted
Answer:
B. two atoms share or transfer electrons
Explanation:
for a chemical bond to occur there must be association of atoms into molecules,ions , crystals or other species that make up familiar substances
A suspension is
•A heterogenous mixture where the solid particles are large enough to be filtered out.
•A homogenous mixture where the solid particles are large enough to be filtered out.
•A heterogenous mixture where the solid particles are too small to be filtered out.
•A homogenous mixture where the solid particles are too small to be filtered out
Answer:
A heterogeneous mixture where the solids particles are large enough to be filtered out.
Explanation:
The energies of the bonds broken in a certain reaction are greater than the energies of the bonds formed. Which one of the following statements about this reaction must be true?
a. The reaction is endothermic.
b. The reaction is exothermic.
c. The reaction is spontaneous.
d. The reaction is non-spontaneous.
Answer:
a. The reaction is endothermic.
Explanation:
The heat involved in a chemical reaction is given by the enthalpy change (ΔH), which is equal to the balance between the chemical bonds that are broken (release energy) and the chemical bonds that are formed (need energy):
ΔH ≅ bonds broken - bonds formed
If broken bonds > bonds formed ⇒ ΔH > 0 ⇒ endothermic reaction
Therefore, the reaction is endothermic (it requires energy).
calculate the percentage of oxygen in Al(NO3)3
Answer;
4.29%
Explanation:
molecular weight of Al(NO3)3 is
27+(14+16*3)3=213 amu
total mass of oxygen is 3*3=9 amu
percentage is 9/213*100=4.25%
Ethyl ethanoate undergoes following reaction [on the picture]
Equal amounts of ethanoic acid and ethanol were mixed together and allowed to reach equilibrium.
At equilibrium, the concentrations of both ethanoic acid and ethanol were 0.42 mol dm^-3.
What is the concentration of ethyl ethanoate at equilibrium?
Answer: The concentration of ethyl ethanoate at equilibrium is [tex]0.653mol/dm^3[/tex]
Explanation:
Given values:
Equilibrium concentration of ethanol = [tex]0.42mol/dm^3[/tex]
Equilibrium concentration of ethanoic acid = [tex]0.42mol/dm^3[/tex]
[tex]K_c=0.27[/tex]
The given chemical equation follows:
[tex]CH_3COOC_2H_5+H_2O\rightleftharpoons C_2H_5OH+CH_3COOH[/tex]
The expression of [tex]K_c[/tex] for above equation follows:
[tex]K_c=\frac{[C_2H_5OH][CH_3COOH]}{[CH_3COOC_2H_5]}[/tex]
Putting values in above expression, we get:
[tex]0.27=\frac{0.42\times 0.42}{[CH_3COOC_2H_5]}[/tex]
[tex][CH_3COOC_2H_5]=\frac{0.42\times 0.42}{0.27}=0.653mol/dm^3[/tex]
Hence, the concentration of ethyl ethanoate at equilibrium is [tex]0.653mol/dm^3[/tex]
Answer:
the answer is 0.81 mol/dm³
which is generally more soluble in water ammonium chloride or potassium chloride explain
Answer:
Ammonium chloride
Explanation:
because is a salt which is highly soluble in water than potassium
Density is the ratio of a sample's mass to its volume. A bar of lead has a mass of 115.2 g. When it is submerged in 25.0 mL of water in a graduated cylinder, the water level rises to 35.5 mL. What is the density of the lead
Answer:
[tex]$10.97 \ g/cm^3$[/tex]
Explanation:
Given :
Mass of a bar of lead = 115.2 g
Initial water level [tex]$\text{in the graduated cylinder}$[/tex] = 25 mL
Final water level [tex]$\text{in the graduated cylinder}$[/tex] = 35.5 mL
Difference in the water level = 35.5 - 25
= 10.5 mL
= [tex]10.5 \ cm^3[/tex]
We know that when a body is submerged in water, it displaces its own volume of water.
Therefore, the volume of the lead bar = volume of the water displaced = 10.5 mL = [tex]10.5 \ cm^3[/tex]
We know that mathematically, density is the ratio of mass of body to its volume.
Density of the lead bar is given by :
[tex]$\rho =\frac{\text{mass}}{\text{volume}}$[/tex]
[tex]$\rho =\frac{\text{115.2 g}}{\text{10.5 cm}^3}$[/tex]
= [tex]$10.97 \ g/cm^3$[/tex]
A 100.00 mL volumetric flask weighs 35.9325 g. When an unknown solid is added to it, the flask and sample weigh 48.8565 g. Deionized water is added to the calibration mark. The flask, sample, and water together weigh 140.8321 g. Calculate the density of the unknown, assuming the density of water is 0.998203 g/mL.
Answer:
1.64 g/mL
Explanation:
Step 1: Calculate the mass of the solid
m(solid+flask) = m(solid) + m(flask)
m(solid) = m(solid+flask) - m(flask)
m(solid) = 48.8565 g - 35.9325 g = 12.9240 g
Step 2: Calculate the mass of water
m(solid+flask+water) = m(solid+flask) + m(water)
m(water) = m(solid+flask+water) - m(solid+flask)
m(water) = 140.8321 g - 48.8565 g = 91.9756 g
Step 3: Calculate the volume occupied by 91.9756 g of water
The density of water is 0.998203 g/mL.
91.9756 g × 1 mL/0.998203 g = 92.1412 mL
Step 4: Calculate the volume occupied by the solid
The 100.00 mL are occupied by the solid and the water.
100.00 mL = V(solid) + V(water
V(solid) = 100.00 mL - V(water)
V(solid) = 100.00 mL - 92.1412 mL = 7.86 mL
Step 5: Calculate the density of the solid
12.9240 g of the solid occupy 7.86 mL.
ρ = 12.9240 g/7.86 mL = 1.64 g/mL
How do you determine the mass number of an atom?
Explanation:
The number of protons and neutrons. you can simply subtract the number of protons, or atomic number, from the mass number to get your final answer.
calculate total pressure on bodies under water surface?
Explanation: this is how to calculate pressure underwater, I'm not sure if it's what you're looking for.
FORMULA: P=hρg
The temperature of 10 kg of a substance rises by 55oC when heated. Calculate the temperature rise when 22 kg of the substance is heated with the same quantity of heat.
Answer:
The temperature rise is 25°C
Explanation:
The heat of a substance is obtained using the equation:
Q = m*S*ΔT
Where Q is heat in kJ, m is the mass of the susbtance, S is specific heat of the material and ΔT change in temperature.
Replacing:
Q/S = m*ΔT
As Q is constant because the heat is the same and S is the specific heat of the material (Constant). We can write:
m1*ΔT1 = m2*ΔT2
Where m is mass and ΔT change in temperature of 1, initial conditions of the substance and 2, final conditions of the substance.
Replacing:
m1 = 10kg
ΔT1 = 55°C
m2 = 22kg
ΔT2 = ?
10kg*55°C = 22kg*ΔT2
ΔT2 = 25°C
The temperature rise is 25°C
Given the following set of atoms, write a bond-line formula for a possible constitutional isomer for the compound. Show all formal charges and lone pairs.C atoms H atoms Other3 6 2 Br atoms
Answer:
Explanation:
Isomers are compounds with the same molecular formula but chemically distinctive structures. Compounds that vary in connectivity, or how the component atoms are related to one another, are known as constitutional isomers. They have distinct functional groups and bonding patterns according to the sequence in which the atoms are linked together.
From the information given:
The compound given is C₃H₆Br₂ and the constitutional isomer of the compound can be seen in the image attached below.
The formal charges are calculated as follows:
Formal charge = valence electron - 1/2(bonding electron) - lone electron
For Br:
Formal charge = 7 - 1/2(2) - 6
Formal charge = 7 - 1 - 6 = 0
For C:
Formal charge = 4 - 1/2(8) - 0
Formal charge = 4 - 4 = 0
For H:
Formal charge = 1 - 1/2(2)
Formal charge = 1 - 1 = 0
how many milliliters of 0.105 M HCL are needed to titrate 22.5 ml of 0.118 M NaOH to the equivalence point
propanoyl chloride reacts with LiAlH4, what will be the product
3. 78 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the
concentration of the base?
What is 0.29km in mm
Need some help with this Chem Question :)
Answer:
Mg + Fe(NO₃)₂ —> Fe + Mg(NO₃)₂
Explanation:
The activity series helps us to easily define whether or not a reaction will occur.
Elements at the top of the activity series are highly reactive and will always displace those at the bottom of the series in any reaction.
With the above information in mind, let us answer the questions given above.
Ag + NaNO₃ —> Na + AgNO₃
The above reaction will not occur because Na is higher than Ag in the activity series. Thus, Ag cannot displace Na from solution.
Pb + Mg(NO₃)₂ —> Pb(NO₃)₂ + Mg
The above reaction will not occur because Mg is higher than Pb in the activity series. Thus, Pb cannot displace Mg from solution.
Mg + Fe(NO₃)₂ —> Fe + Mg(NO₃)₂
The above reaction will occur because Mg is higher than Fe in the activity series. Thus, Mg will displace Fe from solution.
Cu + Mg(NO₃)₂ —> Cu(NO₃)₂ + Mg
The above reaction will not occur because Mg is higher than Cu in the activity series. Thus, Cu cannot displace Mg from solution.
From the above illustration, only
Mg + Fe(NO₃)₂ —> Fe + Mg(NO₃)₂
Will occur.
( Endocytosis / Exocytosis ) is the movement of substances out of a cell by vesicular transport.
Answer:
Exocytosis
Explanation:
Some molecules are simply too big to move via a transport protein or the plasma membrane. To carry these macromolecules in or out of the cell, cells employ two more active transport pathways. Macromolecules or big particles are transported across the plasma membrane via Vesicles transport or other cytoplasmic structures. They are of two types, Endocytosis and Exocytosis
From the given information, Exocytosis is the right answer.
It is the process of vesicles combining with the plasma membrane thereby releasing their contents to the exterior of the cell. When a cell creates components for export, such as proteins, or when it gets rid of a waste product or a toxin, exocytosis occurs. Exocytosis is the process by which newly generated membrane proteins and membrane lipids are transported on top of the plasma membrane.
33. The compound C2H2 belongs to the series of
hydrocarbons with the general formula
A CH,
B C2 H2o
C. C,H2n-2
D. C2.H2n-2
Answer:D
Explanation:
A researcher accidentally spilled some sand into his beaker containing crystalline compound X. Knowing what he did about melting points, he was not worried about obtaining the melting point of compound X with a few grains of sand present. Why
Answer:
See explanation
Explanation:
If we look at the structure of X, we will discover that X is an organic compound. The compound will certainly have a much lower melting point than sand.
This is because, sand is composed of high melting point inorganic materials.
Hence, even though the researcher accidentally spilled some sand into the the beaker containing the crystalline substance X, he does not need to be perturbed since the melting point of X is much lower than that of sand
