Answer:
2.54 molMJ-1
Explanation:
The formation of CO2 is according to the equation;
C(s) + O2(g) -------> CO2
ΔHreaction = ΔHCO2 - [ΔHO2 + ΔHC]
ΔHO2 and ΔHC = 0 KJ
ΔHCO2 = -393.5 KJ
Hence;
ΔHreaction = -393.5 KJ - 0 KJ
ΔHreaction = -393.5 KJ
1 mol of CO2 yields -393.5 KJ/mol
The negative sign only means that heat was evolved in the process.
nCO2 = 1 mol CO2/393.5 KJ * 1 * 10^3 KJ/1MJ
nCO2 = 2.54 molMJ-1
Concentration is ? 
an unknown sample with a mass of 50.0 grams changes from an initial temperature of 22.5°C to a final temperature of 32.4°C. It is known that the sample absorbed 444 J and f heat l. Bases on this information, what substance in the table is most likely the identity of this sample?
Answer:
Aluminum
Explanation:
What is the molarity of a 3.00 L solution that contains 0.400 mol FeCl3?
1.20 M
0.266 M
7.50 M
0.133 M
Answer: 0.133 mol/l
Explanation: molality = concentration = 0.400 mol/3.0 l
Why is it that 1 dm3 of ethanol
not equal to 1 kilogram of
density of ethanol is 0,79 kg/dm^3 so mass of one dm^3
Is 790 g
On a very hot day, could you cool your kitchen by leaving the refrigerator door open?
a. Yes, but it would be very expensive.
b. Yes, but only if the humidity is below 50%.
c. No, the refrigerator would exhaust the same amount of heat into the room as it takes out of the room.
d. No, the heat exhausted by the refrigerator into the room is more than the heat the refrigerator takes out of the room
Answer:c
Explanation:
On a very hot day, No, the refrigerator would exhaust the same amount of heat into the room as it takes out of the room.
What is refrigerator?Eliminating heat from a body but also bringing it down to the lowest temperature actually is the technique of refrigeration. The refrigeration process is carried out in refrigerators.
Therefore, keeping the doorway of an electrical refrigerator open won't help cool the room. In actuality, the refrigerator raises the temperature of the room by removing heat from the freezing compartments as well as rejecting it to the air in the room.
To know more about refrigerator.
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PLEASE HELP WILL GIVG BRAINLEST
Answer:
It is option #1.
Explanation:
Biotechnology is defined as, "The exploitation of biological processes for industrial and other purposes, especially the genetic manipulation of microorganisms for the production of antibiotics, hormones, etc."
Therefore, option #1 is your answer!
Determine if the following statements are true or false. True Standard reduction potential is an intensive property True Reduction takes place at the anode True The half reaction with the lower standard reduction potential will be at the cathode in a galvanic cell True The half reaction with the higher standard reduction potential will be at the cathode in a galvanic cell
Answer:
Standard reduction potential is an intensive property---- True
Reduction takes place at the anode ----- False
The half reaction with the lower standard reduction potential will be at the cathode in a galvanic cell ------false
The half reaction with the higher standard reduction potential will be at the cathode in a galvanic cell ------ True
Explanation:
An intensive property is a property of a substance which is inherent in it and part of its nature. It does not depend on the amount of substance present in the substance. Standard reduction potential is an intensive property.
In a galvanic cell, oxidation takes place at the anode and reduction takes place at the cathode. At the anode, the electrode potential is more negative (an oxidation) while at the cathode the reduction potential is less negative (a reduction).
Reduction potential is an intensive property of cell, reduction takes place at cathode of galvanic cell, the half reaction with the lower standard reduction potential will be at the anode in a galvanic cell and half reaction with the higher standard reduction potential will be at the cathode in a galvanic cell.
What is Galvanic cell?
Galvanic cell is also known as voltaic cell, and in this cell electric current is originated from spontaneous redox reaction.
In the galvanic cell, anode is a negatively charged electrode in which oxidation process takes place and value of electrode potential is more negative. Cathode is a positively charged electrode in which reduction process takes place and electrode potential is less negative. And intensive property is not depends on the amount of substance.
Hence, correct statements are true, false, false and true.
To know more about galvanic cell, visit the below link:
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What are the chemical symbols for the elements calcium, carbon, and chlorine respectively? es
A) CL, C, and Ce
B) C, Ca, and Co
C) Ca. C, and CL
D) Ca, Co, and CL
Answer:
C
Explanation:
5 points! Please don’t guess if u don’t know!
Salts usually have a low melting point.
A. true
B. false
This is true. that's why we use it for snow
Answer:
false
Explanation:
ya thats why we use it for boiling water
How does burning affect an object's property? Burning can cause an object to increase in volume. Burning changes the chemical make up of an object. Burning can create the item to increase in mass. Burning keeps the chemical make up of an object the same.
Answer: Burning changes the chemical make up of an object.
Explanation:
A chemical change can be defined as a change in the substance when it combines with other kind of substance to form a new substance. A chemical change can also occur when a substance is broken down into two or more products. These changes cannot be reversed. These changes affect the physical make up of an object. For example, burning as when an object is burned it cannot be transformed into its original form. A wood if burned can be converted into ash, water and carbon dioxide cannot regain its original form after burning so burning brings about chemical change in an object.
In hydrogen, in order for an electron to emit visible light, it must fall from
some energy state and stop where?
A. 1st energy level
B. 2nd energy level
C. 3rd energy level
D. 4th energy level
Answer:
B
Explanation:
A word which describes a solution which is more dilute than cytoplasm and would cause a cell to swell with water
Answer:
A hypertonic solution has increased solute, and a net movement of water outside causing the cell to shrink. A hypotonic solution has decreased solute concentration, and a net movement of water inside the cell, causing swelling or breakage.
Explanation: hope this helps :) sorry if it's wrong :(
Please help on question 7 and 8, i really need help and this is for marks! I only have 9 min left i will mark brainliest to whoever gives the best answer!
Answer:
I'm going to go with conduction
Explanation:
At first I thought it was combustion but I read the problem incorrectly. It seems like the liquid boils after you put them on the hot plate.
It's most likely conduction because heat and energy is being transferred into the liquid from the hot plate
Is wrought iron substitutional or interstitial?
Answer:
interstitial is correct my child
Explanation:
dentify whether each element is a halogen, a noble gas, or nonmetal only.
Astatine (At):
Nitrogen (N):
Krypton (Kr):
Chlorine (Cl):
Sulfur (S):
Astatine : Halogen
Nitrogen : Nonmetal
Krypton : Noble gas
Chlorine : Halogen
Sulfur : Nonmetal
i just needed the points sorryyy
what part of the food chain is a lemming
a:producer
b:secondary consumer
c:primary consumer
d: predator
hmm...for your answer I think it would be D
Answer:
primary consumer
Explanation:
Lemmings are primary consumers.
Match each object to its definition.
A. meteorite
B. meteoroid
C. meteor
->
1. The remains of a rock from space that strikes Earth’s surface
2. A rock that burns up in Earth’s atmosphere
3. A small piece of rock in space
Answer:
definition 1. goes with B. meteoroid
definition 2. goes with C. meteor
definition 3. goes with A. meteorite
Answer: meteoroid - a small piece of rock in space, meteor - a rock that burns up in Earths atmosphere, meteorite - The remains of a rock from space that strike Earth's surface.
Explanation:
2. How many grams are in 2.05 x 1030 atoms of Lithium (Li)?
Convert 678.92 cm into meters
Answer:6.7892 meters
Explanation:
Whats molecular formula of 26,4% carbon , 3,3 % Hydrogen and 70,3% oxygen?
Explanation: Therefore the molecular formula is twice the empirical formula: C2H6O2. The compound dioxane contains only carbon, hydrogen, and oxygen. When 0.956 g dioxane is burned, 1.91 g carbon dioxide and 0.782 g water are formed. In another experiment, it was determined that 6.04x10-3 mol dioxane weighs 0.532 g.
help me please i beg u
Answer:
none of the above
Explanation:
help me with this question
In physical and chemical changes, the number of atoms and weight of the object always stays the same.
In a chemical change, the substance changes into a different substance.
I'm pretty sure this next one is can or can not be seperated, depending on what has been mixed. Not positive tho.
What molecules can cells break down for energy?
The options
A. Very small gas molecules, like carbon dioxide.
B. Large molecules made from glucose, like starch.
C. Small sugars, like glucose.
D. Very small liquid molecules, like water.
Answer: I think the answer is C)
Explanation:
How many grams of NaOH (MW = 40.0) are there in 500.0 mL
of a 0.175 M NaOH solution?
A) 3.50
B) 114
C) 14.0
D) 2.19x10
Answer:
3.5
Explanation:
500*0.175= 8.75 *40/1000=3500/1000=3.5
Answer:
3.50 grams
Explanation:
Mastering chem
16. What is the typical diameter of an atom?
A. | 10-14 m
B. I x 10-12 m
C. | 10-10 m
D. | x 10-8 m
HELPP PLSS
What is the percent yield of LiCl if I produced 30.85g LiCl and my theoretical yield was calculated to be 35.40g LiCl?
Answer:
87.15%
Explanation:
To find percent yield, we can use this simple equation
[tex]\frac{Actual}{Theoretical} *100[/tex]
Where "Actual" is the amount in grams actually collected from the reaction, and "Theoretical" is, well, the theoretical amount that should have been produced.
They give us these values, so to find the percent yield, just plug the numbers in.
[tex]\frac{30.85}{35.40} *100\\\\ =87.15[/tex]
So, the percent yield is 87.15%
An easy trick to remember how to do this is just to divide the smaller number by the bigger number and move the decimal back two places. If you have a percent yield greater than 100%, something is wrong in the reaction.
Which refers to the force that one massive object exerts to attract another object?
velocity
gravity
acceleration
newt
Answer:
acceleration
mhmm..whichuksnackru?..fishnchiips OUHHHOOUUHHYESS SandyROASTthatsevenbaetterthanfishnchips
Predict the shape of the molecule....
Answer: trigonal bipyramidal
Explanation:
Number of electron pairs = [tex]\frac{1}{2}[V+N-C+A][/tex]
V = number of valence electrons present in central atom
N = number of monovalent atoms bonded to central atom
C = charge of cation
A = charge of anion
[tex]SbCl_5[/tex] :
In the given molecule, antimony is the central atom and there are five chlorine as monovalent atoms.
The number of electron pairs are 5 that means the hybridization will be [tex]sp^3d[/tex] and geometry of the molecule will be trigonal bipyramidal.
Which is the correct formula for finding the frequency of an electromagnetic wave? f = c – lambda f = StartFraction lambda over c EndFraction. f = lambda + c f = StartFraction c over lambda EndFraction.
Answer: It's D
Explanation:
Answer:
the answers d if you give brainliest give it to the other person im not worthy of it
Explanation:
How many mL of 0.25 M NaOH would have 0.18 moles of NaOH
Answer:
[tex]720\ \text{mL}[/tex]
Explanation:
M = Molarity of NaOH = 0.25 M = 0.25 mol/L
n = Number of moles of NaOH = 0.18 moles
Volume of solution is given by
[tex]V=\dfrac{n}{M}[/tex]
[tex]\Rightarrow V=\dfrac{0.18}{0.25}[/tex]
[tex]\Rightarrow V=0.72\ \text{L}\times 10^3=720\ \text{mL}[/tex]
The volume of NaOH in the solution is [tex]720\ \text{mL}[/tex].