The heat of reaction is the quantity of heat absorbed or emitted in a reaction.
What is heat of reaction?The heat of reaction is the quantity of heat absorbed or emitted in a reaction. This question is incomplete hence the numerical value of the heat of reaction can not be determined.
However, the heat of reaction is determined from the mass of the reactants, the temperature change in the calorimeter and the number of moles of the limiting reactant.
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What happens to the pitch of a sound if the frequency is high?
How to polymers work?
Answer:
A polymer is any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, which are multiples of simpler chemical units. Polymers make up many of the materials in living organisms and are the basis of many minerals.
Explanation:
Explanation:
The first man-made polymers were actually modified versions of these natural polymers. Celluloid, the stuff from which silent-movie film was made, was a plastic created from chemically modified cellulose. The first completely synthetic polymer (that is, made by people through chemical synthesis), invented in the early years of the twentieth century, was Bakelite: a plastic made by reacting phenol and formaldehyde under pressure at high temperatures.
# be careful #
A compound is made up of 168.2 g Cd, 35.96 g C, 4.53 g H, and 47.91 g O. What is the empirical formula of this compound
Considering the definition of empirical formula, the empirical formula is Cd₁C₂H₃O₂= CdC₂H₃O₂.
Definition of empirical formulaThe empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.
Empirical formula of the compoundYou know that a compound is made up of 168.2 g Cd, 35.96 g C, 4.53 g H, and 47.91 g O.
Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:
Cd: [tex]\frac{168.2 g}{112.4 \frac{g}{mole} } =[/tex] 1.496 moles
C: [tex]\frac{35.96 g}{12 \frac{g}{mole} } =[/tex] 2.997 moles
H: [tex]\frac{4.53 g}{1 \frac{g}{mole} } =[/tex] 4.53 moles
O: [tex]\frac{47.91 g}{16 \frac{g}{mole} } =[/tex] 2.994 moles
The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:
Cd: [tex]\frac{1.496 moles}{1.496 moles } =[/tex] 1
C: [tex]\frac{2.997 moles}{1.496 moles } =[/tex] 2
H: [tex]\frac{4.53 moles}{1.496 moles } =[/tex] 3.02≅ 3
O: [tex]\frac{2.994 moles}{1.496 moles } =[/tex] 2
Therefore the Cd: C: H: O mole ratio is 1: 2: 3: 2.
Finally, the empirical formula is Cd₁C₂H₃O₂= CdC₂H₃O₂.
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The vapor pressure of pure acetone (C3H6O) is 216 torr
The vapor pressure of pure chloroform (CHCl3) is 157 torr.
What is the mole fraction of acetone (C3H6O) in the vapor phase resulting from a solution of 0.100 mol acetone and 0.200 mol chloroform (CHCl3) in the liquid phase?
The mole fraction of acetone (C₃H₆O) is 0.333
Data obtained from the question Mole of C₃H₆O = 0.1 moleMole of CHCl₃ = 0.2 mole Mole fraction of C₃H₆O =? How to determine the mole fractionMole fraction of a substance can be obtained by using the following formula:
Mole fraction = mole / total mole
With the above formula, we can obtain the mole fraction of C₃H₆O as follow:
Mole of C₃H₆O = 0.1 moleMole of CHCl₃ = 0.2 mole Total mole = 0.1 + 0.2 = 0.3 moleMole fraction of C₃H₆O =?Mole fraction = mole / total mole
Mole fraction of C₃H₆O = 0.1 / 0.3
Mole fraction of C₃H₆O = 0.333
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What did Josh do that allowed him to dissolve that much sugar in only 100 g of water?
Josh used sugar cubes instead of granulated sugar.
Josh used a pan with a large surface area.
Josh stirred the solution.
Josh heated the water.
Answer:
heated the water
Explanation:
Which option describes a wavelength of light?
A. a distance between two similar points on a wave of light
B. an object that makes light bend or bounce
C. a type of visible light
D. a heated atom that forms light
Answer:
Its A
Explanation:
It you look at a wavelength chart, it would show you the rate at which the light travels, from its distance. Which means there has to be two points to calculate it.
How many atoms are in 1mg of NaCl
The number of atoms in 1 mg of NaCl = 1 × 10^19 atoms
Calculation of quantity of atomsAtomic mass of Na = 23
Atomic mass of Cl = 35.5
Therefore the molar mass of NaCl = 23 + 35.5 = 58.5g/mol
But 1 mg = 0.001g and 1 mol = 6.022 × 10^ 23
Therefore, If = 58.5g = 6.022 × 10^ 23 atoms
0.001g =X atoms
X atoms = 6.022 × 10^23 × 0.001/58.5
= 0.1 × 10^23 × 10^-³
= 1 × 10^19 atoms
Therefore, the number of atoms in 1 mg of NaCl =1 × 10^19 atoms.
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use the periodic table to answer this question, state whether the element named in (a)is a metal or nonmetal
Answer:
METALExplanation:
Element Name - Actinium
Symbol - AC
Electronegativity - 1.1
It is a Rare Silvery- white metal that's highly radio active
Continuing from the last question, what is the new pressure inside the container? Hint: Did we use up all of the reactants?
1 atm
3 atm
2 atm
4 atm
If all the reactors are used, the pressure inside the flask will most likely increase to 4 atm.
What is atmospheric pressure?Atmospheric pressure is a force per unit area exerted by the air in the atmosphere on the Earth's surface. The value of atmospheric pressure above sea level is 1013.25 hPa.
What influences the variation of atmospheric pressure?The atmospheric pressure varies from different meteorological factors such as:
Decreases with altitude.It varies according to latitude, the lowest atmospheric pressure at sea level is reached in the equatorial latitudes.The equatorial zone has high atmospheric pressures for dynamic reasons derived from the Earth's rotation.According to the above, if all the reactors are used at atmospheric pressure, it will most likely increase.
Note: This question is incomplete because some information is missing. However I can answer it based on my prior knowledge.
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Fill in the blank to complete each statement
The land that supplies water to a river system is called a
Pollution from a single, identifiable source is called
Pollution that is difficult to link to a particular origin is called
source pollution
source pollution.
Answer:
1- Watershed
2- Point
3- Nonpoint
Explanation:
Just did it
Answer:
1. watershed
2. point
3. nonpoint
Explanation:
Typically if oxygen has a formal negative charge, it is participating in ____ covalent bond(s). Report your answer as a whole number without any decimal places.
Oxygen is participating in non-polar covalent bond(s)
Oxygen forms 2 covalent bond.
This is because oxygen atoms have 6 valence electrons. This means that it has 2 lone pairs and 2 unpaired electrons that are shared in order to achieve octet configuration.
In this chemistry, the 2 lone pairs on the oxygen are not shared with any other atoms. Instead; they are assigned to the oxygen atom. The formal charge on the oxygen atom is zero. Oxygen's atomic number is 8 and is equal to the sum of the number of its valence and inner shell electrons.
What is non-polar covalent bonding?Nonpolar covalent bonding is a kind of covalent bond in which the bonding electrons are shared equally between the two atoms.
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Water (2470 g ) is heated until it just begins to boil. If the water absorbs 5.47x105 J of heat in the process,
what was the initial temperature of the water?
Express your answer with the appropriate units.
Answer:
47.01 °C
Explanation:
Q = mcΔt
Mass of water = 2470g
c or specific heat capacity of water = 4.18 J °C g
Q = 5.47 x 10⁵ J, which is expanded 547,000 J
No idea what Δt is, but we do know the water began to boil, and we know that water's boiling point is 100°C, so the final temperature had to be 100°C.
547,000 J = (2470) x (4.18) x (Δt)
Rearrange equation for Δt
(547,000) / (2470 x 4.18) = Δt
Δt = 52.98°C
But we're not done. We're trying to find the INITIAL TEMPERATURE of the water, not the TEMPERATURE CHANGE. We already have the final temperature, which is 100°C, and now we have how much the initial temperature rose by to get to 100°C.
All that we have to do now is 100 - 52.98 = 47.02°C
The initial temperature of the water is 47.02°C
Calculate the value of K at 700 K for the
reaction
H2(g) + I2(g) → 2 HI(g)
if Kc = 54 at the same temperature.
Answer:
It going to be 54
Explanation:
I got it right but I would say it's because the temperature stays the same. So the K value stays the same.
1. Compare masses: a) 0,4mol CO₂ and 0,6mol H₂O ; b) 0,135mol H₂SO₄ and 0,5mol HCI.
2. Where is the highest number of molecules? a) 0,1mol H₂O or 0,3mol CO₂ ; b) 0,25mol HCI, 3,4g H₂S or 5ml acetic acid CH₃COOH. (ρ=1,049g/ml).
Answer:
you can now deduct which one is greater or smaller and by how much.
Explanation:
no of moles= mass/molar mass
1ai) 0.4 = m/ ( 12 + (16*2)
m= 0.4* 44
m= 17.6g
ii) 0.6= m/( 2*1 + 16)
m= 0.6 *18
m= 10.8g
b) 0.135 = m/ ( 2*1 +32 + (16*4)
m= 0.135* 98
m= 13.23g
ii) 0.5= m/ (1+35.5)
m= 0.5*36.5
m= 18.25g
2. Avogadro's Number = 6.02×10²³
1 mol of any element= 6.02×10²³ particles
a) 0.1 mol of H20= (6.02×10²³) * 0.1
= 6.02×10²² molecules
ii) 0.3 mol of CO2= (6.02×10²³) * 0.3
= 1.806 × 10²³ molecules
Ans: 0.3 mol of CO2
bi) 0.25 mol of HCl= (6.02×10²³) * 0.25
= 1.505 × 10²³ molecules
bii) - find the no of moles first:
no of moles= mass/molar mass
n= 3.4g/ 34g →mr of H2S in g=2+32= 34g
n= 0.l mol
- use the Avogadro Number.
0.1 mol of H20= (6.02×10²³) * 0.1
= 6.02×10²² molecules.
biii) here you're given the density, use it to find the mass of acetic acid.
ρ = 1049 g/ml
ρ = m/v, where v=5 ml
1049 = m/ 5
m= ρ*v
m= 1049*5
m= 5245 g
• convert this into moles.
mr of CH3COOH= 12 + 3+ 12+ 16+ 16+ 1
= 60
mr in g = 60g
n= m/mr
n= 5245/ 60
n= 87. 41666...
n= 87.4 moles
•using Avogadro's Number:
87.4 moles of acetic acid=(6.02×10²³)*87.4
= 2.25148* 10²⁵
= 2.25 * 10²⁵ molecules
thus, the ans for this is 5 ml of acetic acid.
A chemist measures the amount of bromine liquid produced during an experiment. He finds that 5.9 g of bromine liquid is produced. Calculate the number of moles of bromine liquid produced. Be sure your answer has the correct number of significant digits. 0.03mol
Answer:
below•
Explanation:
6.1 g total?
I don't really know alot about Chemistry
3. Calculate the mass of
(6) 0.5 mole of magnesium atoms.
(a) 3 moles of chlorine molecules.
Hope you could understand.
If you have any query, feel free to ask.
What is the mechanism of a chemical reaction? How can a study of reaction rates be used to elucidate
the mechanism of a chemical reaction?
The mechanism of chemical reaction is the series of steps
by which chemical reaction follows to for a new substances.
Mechanism of chemical reactionFor a new substance to evolve from a chemical reaction, there are some steps that needs to be taken. These steps include:
Bonds between atoms in the reactants must be broken,The atoms or pieces of molecules are reassembled into products by forming new bonds. Energy is absorbed to break bonds, and Energy is evolved as bonds are made.The study of reaction rate, which is the change in concentration of a reactant or product with time, helps to explain further the mechanism of chemical reaction.
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A farmer digs a small pond in a pasture. The farmer adds young individuals from two species of
algae-eating fish to the ponds and plants some reeds around the edge of the pond. The farmer wants
the pond to be a sustainable ecosystem.
Which of the following would be most helpful in increasing the pond ecosystem’s sustainability?
a. Decreasing the number of plant species around the edge of the pond
b. Introducing older fish of the same species into the population of algae-eating fish
c. Having a greater diversity of living organisms in the pond
d. Adding gravel between the water and where the reeds are planted
If the farmer wants the pond to be more sustainable, he has to have a greater diversity of living organisms in the pond.
What is an ecosystem?The term ecosystem means a self supporting unit in which there is an exchange of materials and energy. The ecosystem is expected to be self sustaining.
When the farmer adds young individuals from two species of algae-eating fish to the ponds and plants some reeds around the edge of the pond, if the farmer wants the pond to be more sustainable , he has to have a greater diversity of living organisms in the pond.
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Answer: Having a greater diversity of living organisms in the pond
Explanation:
STAAR, Plato, proof below
A Snickers bar contains 27.0 g of sugars (carbohydrates), 4.0 g of protein and 12.0 g of fat. How many food calories (Cal) are contained in the bar
Answer:
There are 232 calories in the bar
Explanation:
Carbohydrates and protein are both 4 calories per gram, while fat is 9 calories per gram.
[tex]27*4=108\\4*4=16\\12*9=108\\108+108+16=232[/tex]
An inhibitor is added to an enzyme-catalyzed reaction at a concentration of 26.7 μM. The Vmax remains constant at 50.0 μM/s, but the KM increases by 150%. Calculate the Ki for this inhibitor.
Using the Michaelis-Menten equation competitive inhibition, the Inhibition constant, Ki of the inhibitor is 53.4 μM.
What is the Ki for the inhibitor?The Ki of an inhibitor is known as the inhibition constant.
The inhibition is a competitive inhibition as the Vmax is unchanged but Km changes.
Using the Michaelis-Menten equation for inhibition:
Kma = Km/(1 + [I]/Ki)Making Ki subject of the formula:
Ki = [I]/{(Kma/Km) - 1}where:
Kma is the apparent Km due to inhibitor Km is the Km of the enzyme-catalyzed reaction[I] is the concentration of the inhibitorSolving for Ki:
where
[I] = 26.7 μM
Km = 1.0
Kma = (150% × 1 ) + 1 = 2.5
Ki = 26.7 μM/{(2.5/1) - 1)
Ki = 53.4 μM
Therefore, the Inhibition constant, Ki of the inhibitor is 53.4 μM.
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HELP ME OUT PLS!!!!
What is the net force, to the nearest newton, that accelerates the ball?
A) 100 N
B) .000025 N
C) 40,000 N
D) 1000 N
Answer:
100n
Explanation:
f= 0.05*2000=100 N
what colud the crew of a hot air balloon do to raise the ballon above some trees
Explanation:
Hot air balloons work because hot air rises. By heating the air inside the balloon with the burner, it becomes lighter than the cooler air on the outside. This causes the balloon to float upwards, as if it were in water.
In response to the upward buoyant force, the hot air in the balloon rises.
What is meant by air buoyancy?The upward force that an object experiences from the air it displaces is known as air buoyancy.
Here,
Due to the fact that hot air is less dense than cold air of similar volume, the heated air causes the balloon to rise. Hot air balloons and blimps benefit from buoyancy, which is the air's upward force that keeps them in the air.
The wind determines the balloon's flight path, but the temperature of the air inside the envelope can be changed to alter the balloon's altitude. In order to raise the temperature inside the envelope and increase lift, the pilot may open one or more burner blast valves, causing the aircraft to ascend, slow down, or stop its descent.
If the envelope has a vent, the pilot can also open it to let hot air escape, which will lower the temperature inside the envelope and reduce lift, allowing the aircraft to descend or slow down or cease ascending.
If the pilot doesn't take action, the air inside the envelope will gradually cool through seepage or contact with cooler outside air and give less lift.
Hence,
In response to the upward buoyant force, the hot air in the balloon rises.
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Use the reactivity series to name two metals that are more reactive than magnesium, and three metals that are less reactive.
Answer:
More reactive - Sodium and potassium
Less reactive - Aluminum, Manganese and Zinc
Answer:
Two more reactive metals= K and Na Three less reactive metals = Al , Zn and FeExplanation:
Here we need to state two metals that are more reactive than Magnesium and three metals which are less reactive than Magnesium using the Reactivity series .
The Reactivity series goes like ,
K > Na > Ca > Mg > Al > Zn > Fe > Ni > Sb > Pb > H > Cu > Hg > Ag > Au > Pt
So from this we see that , Pottasium (K) , Sodium (Na) and Calcium (Ca) are more reactive than Magnesium and Aluminium (Al) , Zinc (Zn) and Iron (Fe) are less reactive than Magnesium .
So that ,
→ Two more reactive metals= K and Na
→ Three less reactive metals = Al , Zn and Fe
I hope this helps .
Why is it that oxygen gas is a diatomic molecule
Answer:
➢ Oxygen exists as a diatomic molecule in nature when it is not combined with any other element. It forms O2 molecule because it is stable when it is uncombined. ... By achieving octet configuration, the diatomic elements become more stable compared to the single atom. Therefore, oxygen and hydrogen are diatomic.
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Which is a derived unit?
Answer:
derived unit. noun. a unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors.
Explanation:
In a mixture of 3 gases what is the total pressure of the gases if Gas A exerts a pressure
of 400 mmHg, Gas B exerts a pressure of 220 mmHg and Gas C exerts a pressure of 140
mm Hg?
Answer:
760 mm of Hg
Explanation:
If the gases A , B and C are non reacting , then according to Dalton's Law of Partial Pressure the total pressure exerted is equal to sum of individual partial pressure of the gases .
If there are n , number of gases then ,
[tex] P_{total}= P_1+P_2+P_3+\dots +P_n[/tex]
Here ,
Partial pressure of Gas A = 400mm of HgPartial pressure of Gas B = 220 mm of HgPartial pressure of Gas C = 140mm of HgHence the total pressure exerted is ,
[tex] P_{total}= P_{Gas\ A }+P_{Gas\ B }+P_{Gas\ C }[/tex]
Substitute ,
[tex]P_{total}=( 400 + 220 + 140 )mm\ of \ Hg [/tex]
Add ,
[tex]P_{total}= 760\ mm\ of \ Hg[/tex]
Hence the total pressure exerted by the gases is 760 mm of Hg.
I hope this helps.
I need an answer now please asap and you will me marked brainiest please it's missing I need it now.
PLEASE ANSWER ALL QUESTIONS!
Refer to the attachment not letting me add answer
How many chiral stereoisomers can be drawn for Ch3chfchfch(ch3)2
How many chiral stereoisomers can be drawn for CH3CHFCHFCH(CH3)2?
Answer:4Process by which plants, algae, and many types of bacteria use sunlight, water, and carbon dioxide to make food and oxygen
Answer: Photosynthesis
Explanation:
The process of photosynthesis is used to help make food for plants. The inputs are sunlight, water (H2O), and carbon dioxide (CO2). Then the outputs are glucose (C6H12O6) which is food, and oxygen (O2) is released.
I hope this helps :)
Look at this image.
What does this image represent
Answer: It means
Oxyhydrogen
Explanation: Each water molecule is made of two hydrogen atoms and one oxygen atom, thus there are two H atoms and one O.