The standard enthalpy change of combustion of hexane is greater than the experimental value because the combustion of hydrocarbons is not always complete.
What is enthalpy of combustion?The term standard enthalpy of combustion is used to described the heat evolved upon burning one mole of a substance in oxygen under standard conditions.
We must recall that the combustion of hydrocarbons is not always complete as such, the standard enthalpy change of combustion of hexane is greater than the experimental value.
Learn more about standard enthalpy change of combustion:https://brainly.com/question/10583725
What's the difference between a conductor and an insulator?
I'll mark you as brainliest
Scientists often use controlled experiments to answer questions. Choose the three correct statements about controlled experiments. (PLEASE INCLUDE THREE ANSWERS)
A) No changes are made to a test group in an experiment.
B) A control group is used for comparison to other groups. Eliminate
C) Only one change can be made per test group in an experiment.
D) Changes can only be made to the control group in an experiment.
E) A controlled experiment must have a control group and test group(s).
If anyone could help with this that would be amazing!
Answer:
Ima go with E I'm still taking the test...
Explanation:
if not E its B but E is the only one that makes sense...
Answer:
Actually it was that is worked but only for 10 days
Explanation:
I took the science unit test
A 35.3 g of element M is reacted with nitrogen to produce 43.5 g of compound M3N2 What is (i) the molar mass of the element and (ii) name of the element?
This problem is providing us with the mass of an unknown element which produces 43.5 g of M3N2. Thus, its name and molar mass are required and found to be 4.02 g/mol and calcium nitride after the following:
Stoichiometry.In chemistry, stoichiometry is a tool used for the calculation of masses or moles involved in chemical reactions, by the utilization of molar masses and mole ratios based on proportional factors.
In such a way, for the given reaction, one can use the formulas to write the following balanced chemical equation:
[tex]3M+N_2\rightarrow M_3N_2[/tex]
Where there is a 3:1 mole ratio of the metal to the product, which means we can use the following stoichiometric setup:
[tex]35.3gM*\frac{1molM}{x}*\frac{1molM_3N_2}{3molM} *\frac{(3x+14.01*2)gM_3N_2}{1molM_3N_2}=43.5gM_3N_2[/tex]
Now, by using the numbers only, one will be able to calculate x as the atomic mass of the element M in g/mol:
[tex]35.3*\frac{1}{x}*\frac{1}{3} *\frac{3x+14.01*2}{1}=43.5\\\\\frac{105.9x+989.106}{3x}=43.5\\ \\105.9x+989.106=130.5x\\\\989.106=130.5x-105.9x\\\\x=\frac{989.106}{130.5-105.9} =40.2g/mol[/tex]
Which matches with the molar mass of calcium. Moreover, we find its name as calcium nitride.
Learn more about stoichiometry: brainly.com/question/9743981
The element least likely to obey the octet rule in forming chemical bonds is
Answer:
The two elements that most commonly fail to complete an octet are boron and aluminum; they both readily form compounds in which they have six valence electrons, rather than the usual eight predicted by the octet rule.
I think it will help you.
The activation energy for the reaction
1
H2(g) + 12(g) → 2 HI(9)
is 169 kJ/mol, and AE for the reaction is +27 kJ/mol. What is the activation energy for the decomposition of HI?
7
ER
kJ/mol
7
why do silver mecury cupper gold not react with water
Since gold and silver are the least reactive metals, they do not react with water. The surface of metallic lead is covered by a thin layer of lead oxide,. As a result, it does not react with water in normal circumstances.
Explanation:
Hope it helps you!!Answer:
why do silver mecury cupper gold not react with water
Explanation:
why do silver mecury cupper gold not react with water
Calcium carbonate is reacting with hydrochloric acid and water to form the products calcium chloride hexahydrate and carbonic acid(which decomposes into water and carbon dioxide). Note: water is part of this reaction! if 10.76 g of calcium reacts with 10.51 g of hydrochloric acid, calculate how many grams of the hydrate will be formed
I need the written reaction, the limiting reactant work, and lastly, the stoichiometry work
Answer:
11.5 g
Explanation:
28.0 g
−
16.5 g
=
11.5 g
What is the concentration of Ni2+(aq) ion in a 0.035 M Ni(NO3)2 solution that is also 1.00 M NH3? (Kf for Ni(NH3)6 ^2+ = 5.5 × 108)
a) 3.5 × 10–2 M
b) 6.4 × 10–11 M
c) None of these is correct.
d) 2.6 × 10–10 M
e) 7.9 × 10–11 M
The concentration of X2+(aq) ion is mathematically given as
X^{2+}=3*10^{-10}M
What is the concentration of X2+ ion?Question Parameters:
the concentration of X2+(aq) ion in a 0.035 M (NO3)2 solution
Generally, the equation for the Chemical Reaction is mathematically given as
X2+ + 6xH3--><--- (X(xH_3)_6)^2+
Therefore
X^{2+}=(X (xH_3) _6)^{2+}) /(x ^{2+})+(xH_3^6)
[tex]X^{2+}=\frac{0.375}{5.5*10^8*0.79^6}[/tex]
X^{2+}=3*10^{-10}M
Hence, we have that the concentration of Ni2+(aq) ion is X^{2+}=3*10^{-10}M
Read more about Chemical reactions
https://brainly.com/question/11231920
Which of the following is an example of a response to the stimulus of a dangerous predator?
A.
a skunk releases a pungent odor
B.
a bee makes honey
C.
a human stomach growls
D.
a tree's leaves change colors
how do carbon and silicon differ with regard to the types of orbital available for hybridization?
Which product (if any) will form a precipitate in the following reaction?
3CaCl2(aq) + 2Na3PO4(aq) --> Ca3(PO4)2 + 6NaCl
a)Ca3(PO4)2
b)NaCl
c)No Precipitate Formed
d)Na3PO4
Answer:
I'm pretty sure the answer is A. Ca3(PO4)2.
How many atoms are in 3.5 L of Neon at STP?
Answer:
This is the answer to the question 0.1734
Explanation:
3.5/20.18
=0.1734
which chemical equations show an oxidation- reduction reaction
Answer:
O2 + 2H2 → 2H2O MgSO4 + CaCl2 → MgCl2 + CaSO4 2Al + 6HI → 2AlI3 + 3H2 FeCl2 + Na2CO3 → FeCO3 + 2NaCl 2AgNO3 + Na2S → Ag2S + 2NaNO3
State collision theory
Collision theory states that when suitable particles of the reactant hit each other with correct orientation, only a certain amount of collisions result in a perceptible or notable change; these successful changes are called successful collisions.
Explanation:here your answer matehave a great day
Give an example of two different compounds that have a hydrogen bonding interaction when mixed together.
How many moles are in 15g of Na2CO3?
Answer:
105.98844
Explanation:
How to balance K+H20?
Answer: K + H2O = KOH + H2
Explanation:
what would be the effect if electrons were loosely held
Answer:
I'm pretty sure They will exhibit high conductivity, ductility, and malleability because of their atomic structure.
Explanation:
I'm not 100 percent sure
The inside of a basketball has a pressure of 0.476 atm at 25.0°C. What is the pressure inside of the ball if the temperature is decreased to 20.0°C?
Use the formula:
P1
T1
=
P2
T2
Answer:
1) 0.468 atm
Slide 4: 9.2 atm Slide 5: D B E
Slide 6:
Gas A 1.31,
Gas B 0.444
Explanation:
edge 2022
The inside of a basketball has a pressure of 0.476 atm at 25.0°C. The pressure inside the ball if the temperature is decreased to 20.0°C is 0.484 atm.
What do you mean by the pressure ?The term pressure is defined as the amount of force applied perpendicular to the surface of an object per unit area. The symbol for it is "p" or P.
There are two basic types of pressure are absolute and gauge - distinguished by what pressure they are compared to, which is called the reference pressure.
Given:
P1 = 0.476 atm
T1 = 25.0°C = 298K
P2 = ?
T2 = 20.0°C = 293 K
P1T1 = P2T2
By putting these values in above equation and we get,
P2 = P1T1/ T2
= 0.476 ×298 / 293
= 0.484 atm
Thus, the pressure inside the ball if the temperature is decreased to 20.0°C is 0.484 atm.
To learn more about the pressure, follow the link;
https://brainly.com/question/12971272
#SPJ2
Balance the equation: ___Li3N + ___NH4NO3 -> ___LiNO3 + ___ (NH4)3N
What type of reaction is the one above?
Answer: Li3N + 3NH4NO ---> 3LiNO3 + (NH4)3N
Explanation: Above is a double displacement/replacement reaction since two compound are sought as displacing.
Hope this helps!
Why are the waters of the North Atlantic, like the waters near coral reefs, murky green? 1. The color is caused by chlorophyll in the water.
2. The color is caused by the waste products given off by fish.
3. The color is caused by coral reefs in the area.
4. The color is caused by the lack of oxygen in the water
The waters of the North Atlantic are murky green because the color is caused by coral reefs in the area. That is option 4.
The effects of overgrowth of algaeThe excess nitrogen and phosphorus which is found in fertilizers can cause an overgrowth of algae in a short period of titme, when washed into water bodies. This is called algae blooms.
The effects of overgrowth of algae on aquatic bodies include the following:
reduce the ability of fish and other aquatic life to find food It causes thick, green muck that impacts clear water, recreation, businesses and property values.Therefore, the murky green color is caused by coral reefs in the area.
Learn more about coral reefs here:
https://brainly.com/question/10770235
Answer:
The waters of the North Atlantic are murky green because the color is caused by coral reefs in the area. That is option 4.
The effects of overgrowth of algae
The excess nitrogen and phosphorus which is found in fertilizers can cause an overgrowth of algae in a short period of titme, when washed into water bodies. This is called algae blooms.
The effects of overgrowth of algae on aquatic bodies include the following:
reduce the ability of fish and other aquatic life to find food
It causes thick, green muck that impacts clear water, recreation, businesses and property values.
Therefore, the murky green color is caused by coral reefs in the area.
Learn more about coral reefs here:
brainly.com/question/10770235
Explanation:
A gas has a density of 1.57g/L at 40.0C and 2.00atm of pressure. What is the identity of the gas?
Answer:
Neon
Explanation:
K=C degrees+273.15 = 40.0+273.15=313.2 K
M=1.57g/L×0.08206 atm L/mol K×313.2 K/2.00 atm
M=20.17 g/mol
K= Kelvin
M= Molar Mass
Lewis structure of Hydroxide ion and it's formal charge
Answer:
Hopefully this was helpful!
In this structure, Oxygen (O) is the central atom, and it is bonded to one Hydrogen (H) atom. Oxygen also has two lone pairs of electrons.
To calculate the formal charge, we need to determine the valence electrons of each atom and compare them to the number of electrons assigned to the atom in the Lewis structure.
For Oxygen (O):
Valence electrons = 6
Number of lone pairs = 2
Number of bonding electrons = 2 (from the bond with Hydrogen)
Formal charge = Valence electrons - Lone pairs - Number of bonding electrons
= 6 - 2 - 2
= 2 - 2
= 0
For Hydrogen (H):
Valence electrons = 1
Number of bonding electrons = 2 (from the bond with Oxygen)
Formal charge = Valence electrons - Number of bonding electrons
= 1 - 2
= -1
Therefore, the formal charge of Oxygen in the hydroxide ion (OH-) is 0, and the formal charge of Hydrogen is -1.
Learn more about Lewis Dot Structure, here:
https://brainly.com/question/28652824
#SPJ6
13.41g of Fe(NO3)2 is dissolved in 83.0mL of water. Calculate the molarity of the solution.
Answer:
whats the question in this
Explanation:
Dale marc is a 16-years -old stident. he lives in taal,batangas,together with his family. fishing is their primary source of income. they found out that the taal volcano had erupted in taal batangas. what are the possible effects / of this condition on thier condition on their family, and what advice are you going to give him?
The possible effects of this condition on the family is adverse because they can't do fishing due to eruption.
Effects of volcanic eruption on fishing
Aquatic life can be affected due to volcanic eruption due to increase in acidity, change in temperature, and change in food supply. These factors can damage and also kill fish so this eruption has adverse effect on the family's economic condition and my advice is to them to change their place of living and settle in other unaffected area.
Learn more about volcano here: https://brainly.com/question/1258078
One day you experience violent thunderstorms followed by a few days of colder weather.
Which type of front most likely moved through your area?
occluded front
stationary front
warm front
cold front
Answer: Cold front
Answer:
Cold front lol
Explanation:
Hopefully this helps :)
1 mole of Cl2 will produce how many atoms of KCl?
Answer:
1.1 mole
Explanation:
The mass of potassium chloride is 3.8 g . Look at the mole ratio you have between potassium chlorate and potassium chloride; what you will see is that every 2 moles of potassium chlorate will produce 2 moles of potassium chloride, i.e. you have a 1:1 mole ratio between the two compounds
Pick a "for every" statement about copper and silver nitrate for this reaction.
A For every 1 mole of copper, the reaction uses 2 moles of silver nitrate.
B For every 1 mole of copper, the reaction makes 2 moles of silver nitrate.
C For every 1 mole of copper, the reaction uses 3 moles of silver nitrate.
D For every 1 mole of copper, the reaction uses 1 moles of silver nitrate.
From the equation of the reaction; for every 1 mole of copper, the reaction uses 2 moles of silver nitrate.
What is a reaction?A chemical reaction involves the transformation of one chemical specie into another. The reaction is not shown here hence the question is incomplete.
However, the reaction should be of the sort; Cu + 2AgNO3 ---> Cu(NO3)2 + Cu. Thus, for every 1 mole of copper, the reaction uses 2 moles of silver nitrate.
Learn more about chemical reaction: https://brainly.com/question/6876669
Oscar made a terrarium by filling a jar with some rocks, soil, plants, and water.
Oscar placed a grasshopper in the terrarium and then put a lid on the jar. From what source will the grasshopper receive enough oxygen to survive?
from the soil
from the soil
from the plants
from the plants
from the rocks
from the rocks
from the water
from the plants
Explanation:
bc plant produce 02
The collective name for the abiotic factors which include light, temperature, water, atmospheric gases and wind.