Answer:
[tex]Q=-50,307kJ[/tex]
Explanation:
Hello there!
In this case, since following reaction:
C2H4+3 O2-> 2CO2 + 2H2O
Has an enthalpy of combustion of ethene is about -1411.1 kJ/mol (can be found on goo gle), it is possible to calculate the total amount of energy that is released when 1000 grams of ethene are burned as shown below:
[tex]Q=-1411.1 \frac{kJ}{molC_2H_4} *\frac{1molC_2H_4}{28.05gC_2H_4}*1000gC_2H_4 \\\\Q=-50,307kJ[/tex]
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Can someone answer this pls
Answer:12
Explanation:
Which solute, an electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each
solute is dissolved in the same mass of water?
O The nonelectrolyte does because it disperses into molecules.
O The electrolyte does because it disperses into molecules.
O The nonelectrolyte does because it dissociates into ions.
O The electrolyte does because it dissociates into ions.
The solute wether electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water The nonelectrolyte does because it dissociates into ions.
What is a solute?Solute refers to substances or liquid which can readily dissolve in a solvent. It's concentration is lower to that of solvent.
Therefore, The solute wether electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water The nonelectrolyte does because it dissociates into ions
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Answer:
D: The electrolyte does because it dissociates into ions.
Explanation:
Which of the following statements explains which trial has a lower concentration of the reactant? (5 points) Trial 1, because the average rate of the reaction is lower. Trial 1, because this reaction lasted for a longer duration than Trial 2. Trial 2, because this reaction was initially fast and later slowed down. Trial 2, because the v
Answer:
A)Trial 1 because the average rate of reaction is lower.
Explanation:
I accidentally gave myself low rating my bad
The statement that best explain which trial has a lower concentration of the reactants is Trial 1, because this reaction lasted for a longer duration than Trial 2.
What is a Chemical reaction?Chemical reaction refers to reaction that take place between reacting substances in which the chemical substances are transformed to products.
When the concentration of the reactants increases, more molecules tend to interact with each other in order to form new compounds, and the rate of reaction increases. When the concentration of the reactants reduces, there are little of that molecule present, and the rate of reaction decreases
Therefore, The statement that best explain which trial has a lower concentration of the reactants is Trial 1, because this reaction lasted for a longer duration than Trial 2.
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What is the pH of a 0.0001 M aqueous solution of HCI?
How many grams of water, H 2 O , is given o when 62.1 g of propane, C 3 H 8 , burns?
Answer:
101.62 grams of water is given o when 62.1 g of propane burns.
Explanation:
Propane gas (C₃H₈) burns with oxygen gas and products carbon dioxide gas and liquid water. The balanced reaction is:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
By stoichiometry, the following amounts of moles of each compound participate in the reaction:
C₃H₈: 1 mole O₂: 5 moles CO₂: 3 moles H₂O: 4 molesBeing the molar mass of each compound:
C₃H₈: 44 g/mole O₂: 32 g/moleCO₂: 44 g/moleH₂O: 18 g/moleBy stoichiometry, the following mass quantities of each compound participate in the reaction:
C₃H₈: 1 mole* 44 g/mole= 44 grams O₂: 5 moles* 32 g/mole= 160 gramsCO₂: 3 moles* 44 g/mole= 132 gramsH₂O: 4 moles* 18 g/mole= 72 gramsThen you can apply the following rule of three: if by stoichiometry 44 grams of propane produces 72 grams of water, 62.1 grams of propane how much mass of water does it produce?
[tex]mass of water=\frac{62.1 grams of propane*72 grams of water}{44 grams of propane}[/tex]
mass of water= 101.62 grams
101.62 grams of water is given o when 62.1 g of propane burns.
When a stalactite is formed by water leaving mineral deposits from the ceiling of a cave, this is caused by_____
A:Erosion
B: deposition
Answer:
it is b
Explanation: As the carbon dioxide is released, calcite is precipitated or redeposited on cave walls, ceilings and floors. As the redeposited minerals build up after countless water drops, a stalactite is formed.
which deflects winds to the right or left
Answer:
right
Explanation:
the air that circulates to the right is deflected, because of the earths gravitational rotation, and how its tilted.
Based on information from the periodic table, what does this image represent?
A. A neutral fluorine atom
B. A negatively charged fluoride atom
C. A positively charged fluoride ion
D. A neutral neon atom
Based on the information given, the image represents a negatively charged fluoride atom (Option B)
Composition of atomAn atom is composed of a centrally placed nucleus (containing protons and neutrons) and a cloud of electrons revolving round it.
How to determine the chargeFrom the question given above, the following data were obtained:
Proton = 9Neutron = 10Electron = 10Charge =?Charge = Proton – Electron
Charge = 9 – 10
Charge = –1
Note
Element with proton number of 9 is fluorine
Thus, we can conclude that the image represents a negatively charged fluoride ion (Option B)
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Answer:
B
Explanation:
Silicon can be made by heating a mixture of sand (silicon dioxide) with magnesium
powder.
The equation for this reaction is shown below.
SiO2 (s)+ 2Mg (s) → 2MgO (s) + Si (s)
Calculate the mass of silicon dioxide needed to make 1 g of silicon.
Relative atomic masses: O = 16; Si = 28
Mass = ?
Answer:
[tex] \frac{60}{28} = \frac{15}{7} [/tex]
Please help as soon as possible
The molecules of which of the following would have the most kinetic energy?
A
boiling water
B
a cold glass of water
C
a warm cup of tea
D
an ice cube
Answer:
A
boiling water
Explanation:
The boiling point of water is 212 degrees F. Due to the temperature of the water being this high, the particles are sped up since heat increases kinectic energy.
What type of product is formed when acids are added to some ionic compounds
Answer:
salt
Explanation:
When acid and base solutions react, they produce water and a neutral ionic compound called a salt.
The heat of vaporization of a liquid is 84.0 J/g. How many joules of heat would it take to completely vaporize 172 g of this liquid at its boiling point?
Answer:
14,448 J of heat would it take to completely vaporize 172 g of this liquid at its boiling point.
Explanation:
The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to Q = m*L, where L is called the latent heat of the substance and depends on the type of phase change.
During the evaporation process, a substance goes from a liquid to a gaseous state and needs to absorb a certain amount of heat from its immediate surroundings, which results in its cooling. The heat absorbed is called the heat of vaporization.
So, it is called "heat of vaporization", the energy required to change 1 gram of substance from a liquid state to a gaseous state at the boiling point.
In this case, being:
Q=?m= 172 gL= 84 [tex]\frac{J}{g}[/tex]and replacing in the expression Q = m*L you get:
Q=172 g*84 [tex]\frac{J}{g}[/tex]
Q=14,448 J
14,448 J of heat would it take to completely vaporize 172 g of this liquid at its boiling point.
what is the chemical reaction for respiration
Respiration is the chemical process by which organic compounds release energy. The compounds change into different ones by exergonic reactions. The hydrolysis of adenosine triphosphate (ATP) to adenosine diphosphate (ADP) and phosphoric acid (Pi) releases energy (it is an exergonic reaction).
This question is about acids and bases.
Which ion is found in all acids?.
CI-
H
Nat
OH-
Answer:
OH- is the correct answer
mark me brainst answer
Answer:
h
Explanation:
The common ion in all acids is the hydrogen or hydronium ion
HELP ME !!!!!!!
How much kinetic energy does an 8 Kg bowling ball have when it is thrown at 9 m/s down the alley?
A. 324 J
B. 36 J
C.705.6 J
D.324 energies
Answer:
A. 324 J
Explanation:
What volume would a sample of gas occupy in LITERS at 0.985 atmospheres and a volume of 3.65 liters if the pressure were raised to 861.0 mmHg?
Answer:
3.18 L
Explanation:
Step 1: Given data
Initial pressure (P₁): 0.985 atmInitial volume (V₁): 3.65 LFinal pressure (P₂): 861.0 mmHgFinal volume (V₂): ?Step 2: Convert P₁ to mmHg
We will use the conversion factor 1 atm = 760 mmHg.
0.985 atm × 760 mmHg/1 atm = 749 mmHg
Step 3: Calculate the final volume of the gas
Assuming ideal behavior and constant temperature, we can calculate the final volume using Boyle's law.
P₁ × V₁ = P₂ × V₂
V₂ = P₁ × V₁/P₂
V₂ = 749 mmHg × 3.65 L/861.0 mmHg = 3.18 L
What does a negative AHf for a molecule mean?
A. Energy was added when the molecule changed phases.
B. Energy was added when the molecule was formed from its
elements.
C. Energy was released when the molecule was formed from its
elements.
O D. Energy was released when the molecule went through a phase
change.
SUBMIT
Option D I got it right
ANSWER: C (ENERGY WAS RELEASED WHEN THE MOLECULE WAS FORMED FROM ITS ELEMENTS.)
HOPE THE OTHER PERSON IS WRONG!
Calculate the equilibrium constant of the reaction below if the pressures are 1.0atm, 2.0 atm, and 1.0 atm respectively. PCl3 + Cl2 <--> PCl5
Answer:
K = 0.5
Explanation:
Based on the reaction:
PCl₃ + Cl₂ ⇄ PCl₅
The equilibrium constant, K, is defined as:
K = P PCl₅ / P PCl₃ * P Cl₂
Where P represent the pressure at the equilibrium for each one of the gases involved in the equilibrium.
As:
P PCl₅ = 1.0atm
P PCl₃ = 1.0atm
P Cl₂ = 2.0atm
K = 1.0atm / 1.0atm * 2.0atm
K = 0.5The element cobalt displays many similarities to the element iron and is also attracted to magnets. Based on this information, is it likely that cobalt forms magnetic domains? Explain your answer.
In ferromagnetic materials, smaller groups of atoms band together into areas called domains, in which all the electrons have the same magnetic orientation. That's why you can magnetize them.
What is the meaning of magnetic domains?A portion of a ferromagnetic material where the magnetic moments are aligned with one another because of interactions between molecules or atoms.
In ferromagnetic materials, the atoms form structures called domains.
A domain is a region inside of a material where groups of magnetic moments naturally align in the same direction.
There can be numerous domains within an object.
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A gas system has an initial number of moles of 0.693 moles with the volume unknown. When the number of moles changes to 0.928 moles volume is found to be 7.98 L. What was the initial volume in mL?
Answer:
The initial volume in mL is 5959.2 mL
Explanation:
As the number of moles of a gas increases, the volume also increases. Hence, number of moles and volumes are directly proportional i.e
n ∝ V
Where n is the number of moles and V is the volume
Then, n = cV
c is the proportionality constant
∴n/V = c
Hence n₁/V₁ = n₂/V₂
Where n₁ is the initial number of moles
V₁ is the initial volume
n₂ is the final number of moles
and V₂ is the final volume.
From the question,
n₁ = 0.693 moles
V₁ = ?
n₂ = 0.928 moles
V₂ = 7.98 L
Putting the values into the equation
n₁/V₁ = n₂/V₂
0.693 / V₁ = 0.928 / 7.98
Cross multiply
∴ 0.928V₁ = 0.693 × 7.98
0.928V₁ = 5.53014
V₁ = 5.53014/0.928
V₁ = 5.9592 L
To convert to mL, multiply by 1000
∴ V₁ = 5.9592 × 1000 mL
V₁ = 5959.2 mL
Hence, the initial volume in mL is 5959.2 mL
which is BEST used to describe a chemical reaction that also produces a change in heat?
a. exothermic reaction
b. chemical reaction
c. thermochemical reaction
d. nuclear reaction
will give brainliest
Answer:
I think it's thermochemical reaction and sorry if it's wrong
Contains a nonmetal and metal
A) base
B) acid
C) covalent bond
D) salt
Does this platform really work?
Answer:
Yes, it does, it helps very much :))
Explanation:
Balance the following chemical equation by providing the correct coefficients:
[ ]N2 + [ ]H2 -> [ ]NH3
Nitrogen + hydrogen produces ammonia (NH3)
Answer:
1 N2 + 3 H2 --> 2 NH3 :))) !!
Please help me with this homework
Haley has been having difficulty breathing. She is having difficulty with the gas exchange in the respiratory system. Which organ is being affected?
Answer:
Lungs.
Explanation:
This is because the lungs are respiratory organs in the body that are located at the either side of the thorax or chest. These are organs that are incharge of exchange of gases. The air is breathe in through the trachea i.e oxygen is inhaled and carbondioxide which is the waste product is exhaled. Gas exchange take place in the lungs.
5. Make a graph: Plot your data on the graph to the right of the data table. Draw a line to conn points in order.
Answer:
i did c
Explanation:
relative mass of MgCl2
Full explanation
Mine answer is coming 59.7
Answer:
Ar(Mg)=24g
Ar(Cl)=35,5 and Cl2=35,5×2=71g
m=24g+71g=95g
Define the term metal ore
Answer:
Ore is a deposit in Earth's crust of one or more valuable minerals. The most valuable ore deposits contain metals crucial to industry and trade, like copper, gold, and iron
The naturally occurring material from which a mineral or minerals of economic value can be extracted.
Difference between Displacement and Double Displacement reaction
Answer:
please follow me
Explanation:
A displacement reaction is the one when a more reactive substance displaces a less reactive one from its salt solution whereas a double displacement reaction is the one where a mutual exchange of ions happens between two compounds.