Answer:
6.944 liters of O₂ at STP will react with 8.7 grams of C₂H₄ to form CO₂ and H₂O.
Explanation:
The balanced reaction is:
C₂H₄ + 3 O₂ ⇒ 2 CO₂ + 2 H₂O
Being the molar mass of the elements:
C: 12 g/moleH: 1 g/moleThen the molar mass of compound C₂H₄ is:
C₂H₄= 2*12 g/mole + 4*1 g/mole= 28 g/mole
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), 1 mole of C₂H₄ acts. Then, being the mass of a mole of a substance, which can be an element or a compound, 1 mole of C₂H₄ is 28 g, which is the amount of mass that reacts in this case.
Then be able to apply the following rule of three: if by stoichiometry 28 grams of C₂H₄ react with 3 moles of O₂, 8.7 grams of C₂H₄ with how many moles of O₂ do they react?
[tex]moles of O_{2} =\frac{8.7 grams ofC_{2} H_{4}*3 moles of O_{2} }{28grams ofC_{2} H_{4}}[/tex]
moles of O₂= 0.31
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Then we can apply the following rule of three: if by definition of STP 1 mole occupies 22.4 L, 0.31 moles how much volume will it occupy?
[tex]volume=\frac{0.31 moles*22.4 L}{1 mole}[/tex]
volume= 6.944 L
6.944 liters of O₂ at STP will react with 8.7 grams of C₂H₄ to form CO₂ and H₂O.
The volume of O₂ at STP that will react with the given C₂H₄ is 20.8 L
First, we will determine the number of moles of O₂ required.
From the given balanced chemical equation,
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
This means
1 mole of C₂H₄ is required to react completely with 3 moles of O₂
Now, we will determine the number of moles of C₂H₄ present
Mass of C₂H₄ = 8.7 g
Using the formula
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Molar mass of C₂H₄ = 28.05 g/mol
∴ Number of moles of C₂H₄ = [tex]\frac{8.7}{28.05}[/tex]
Number of moles of C₂H₄ = 0.31016 mole
Since
1 mole of C₂H₄ is required to react completely with 3 moles of O₂
Then,
0.31016 mole of C₂H₄ will react completely with 3 × 0.31016 mole of O₂
3 × 0.31016 = 0.9305 mole
∴ Number of moles of O₂ required is 0.9305 mole
Now, for the volume of O₂ at STP that will react
Since 1 mole of a gas occupies 22.4 L at STP
Then,
0.9305 mole of O₂ will occupy 0.9305 × 22.4 L at STP
0.9305 × 22.4 = 20.8432 L
≅ 20.8 L
Hence, the volume of O₂ at STP that will react with the given C₂H₄ is 20.8 L
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What is the mass in grams of 0.40 moles of sodium borohydrate NaBH4
Answer:
Mass = 15.12 g
Explanation:
Given data:
Mass of sodium borohydride = ?
Number of moles of sodium borohydride =0.40 mol
Solution:
Formula:
Mass = number of moles / molar mass
Molar mass of sodium borohydride = 37.8 g/mol
By putting values,
Mass = 0.40 mol × 37.8 g/mol
Mass = 15.12 g
24.Og sample of carbon contains how may moles?
Answer:
2 moles
Explanation:
1.9982182553889358 real number but round up to 2
If different atoms can come together to form living and nonliving things, why is there a limit to different combinations we encounter around the universe?
Explanation:
There is a limit to different things we encounter around the universe due to a lot of reasons.
Some combinations takes place under special conditions due to the activation energy barrier present.To overcome these barriers, some catalysts that are not readily available are needed. This reduces the combination of some atoms in nature.
Also, the right temperature and pressure conditions might not be present. For most reactions to occur, the right conditions must be made available by nature.This and many more reasons limits the combination of chemical substances.
There is a limit to different things we encounter around the universe due to a lot of reasons:
Some combinations takes place under special conditions due to the activation energy barrier present. To overcome these barriers, some catalysts that are not readily available are needed. This reduces the combination of some atoms in nature. Also, the right temperature and pressure conditions might not be present. For most reactions to occur, the right conditions must be made available by nature.So, for a chemical reaction to occur there are certain parameters that need to taken into consideration for a chemical reaction to actually takes place.
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Heat is transferred in all but which way.
Select one:
a. convection
b. sublimation
c. conduction
d. radiation
Btw I know it’s science but chem was closest thing to that
PLZ ANSWER IN THE NEXT 24 HOURS MANY POINTS!!!!!!!!
You have found a new element with the atomic mass of 119. In a paragraph explain where you would put in on the periodic table and why you would put it there. What type of properties would this element have? What would you call it?
Answer:
Ununennium.
Explanation:
Ununennium, also known as eka-francium or element 119, is the hypothetical chemical element with symbol Uue and atomic number 119. It's Mass number is [315] (predicted), as we as it is existing on the periodic table hence its symbol: Uue
Answer B
Explanation:
hereI wpould put it on t
Which of the following explains the VSEPR geometry of a carbon tetrachloride molecule? (5 points)
It is bent because there are four bonded pairs around carbon.
It is tetrahedral because there are four bonded pairs around carbon.
It is bent because there are two bonded pairs and two lone pairs around carbon.
It is tetrahedral because there are two bonded pairs and two lone pairs around carbon.
Answer:
(B) It is tetrahedral because there are four bonded pairs around carbon
Explanation:
CCl4 means four chloride ions bonded covalently with single carbon.
its coordination figure is:
CF = 1/2(Vallence of central atom + electrons donated from substituents - charge)
CF = 1/2(4 + 4.1 - 0)
CF = 4
Bond electrons = 4
Lone pair electrons = 0
Hence, CCl4 is tetrahedral
The way Earth's rotation makes winds curve.
Answer:
it is called the prevailing westerlies
Explanation:
Is 4atm to big of a difference to get when I use the ideal gas law vs the van der waals equation?
This absolute amount of pressure does not play a significant difference.
At high temperatures and low pressures, its results deviate too little.
But at low temperatures and high pressures, it will change significantly and this difference will change from gas to gas.
In the image you can see the difference between some results from both equations.
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
Answer:
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
Explanation:
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
Lidia sets an empty metal pot on a hot stove burner. Which diagram best shows how heat from the burner will flow through the metal of the pot?
Answer:
The pan on the bottom right with the arrows pointing up.
Explanation:
conduction is the transfer of heat through touching surfaces, so when you place the pan on a hot stove, the heat heats up the bottom of the pan, and then the water in it.
The transfer of energy between systems through work is the expansion of gas in a steam engine. Therefore, the second diagram in the second row shows the correct direction of flow of heat.
What is energy transfer in thermodynamics?
Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.
Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. When heat flow through touching surfaces is called conduction. Heat flows in the upward direction from bottom in a pan.
Therefore, the second diagram in the second row shows the correct direction of flow of heat.
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Please help outttt:(
Explanation:
1)
2Fe+3Cl2 →2FeCl3
2)
CH4+2O2 → CO2 +2H2O
3)
SnO2+2H2 →2H2O +Sn
4)
2KOH + H2SO4 → K2SO4+2H2O
Which element has the largest atom (longest atomic radius) and which element has the smallest atom (shortest atomic radius)?
Answer:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
Help Please with this
Balance the following chemical equation by providing the correct coefficients.
Na + H2O ———— NaOH+H2
Please help!!!!!!!!
Answer:
2, 2, 2, and 1
Explanation:
I put that in and it was correct.
What are the products of the combustion of a hydrocarbon?
carbon and oxygen
carbon dioxide and water
carbon and hydrogen
carbon dioxide and hydrogen
Answer:
I think carbon and hydrogen
Answer:
Its carbon and hydrogyen
Explanation:
got it right on edge
A state of matter in which the electrons temporarily separate from the protons. Group of answer choices gas plasma liquid Bose-Einstein Condensate
Answer:
Plasma.
Explanation:
In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states. The three (3) classical states of matter are;
I. Solid.
II. Liquid.
III. Gas
Plasma can be defined as a state of matter in which the electrons temporarily separate from the protons and as a result, it is generally referred to as the fourth (4th) state of matter due to its superheated nature.
what is the mass in grams of a sample of 7.3 x 10^23 molecules of (iodine heptafluoride) IF7
320 g IF₇
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.3 × 10²³ molecules IF₇
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of I - 126.90 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of IF₇ - 126.90 + 7(19.00) = 259.9 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 7.3 \cdot 10^{23} \ molecules \ IF_7(\frac{1 \ mol \ IF_7}{6.022 \cdot 10^{23} \ molecules \ IF_7})(\frac{259.9 \ g \ IF_7}{1 \ mol \ IF_7})[/tex]Multiply/Divide: [tex]\displaystyle 315.056 \ g \ IF_7[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
315.056 g IF₇ ≈ 320 g IF₇
Write a chemical equation of Dr. Jeff's demonstration using a battery to light steel wool on fire. The battery is used to allow a current to travel through the steel wool, thus heating it. Steel wood is made from iron (Fe).
Answer:
2Fe(s) + 3O2(g) --------> 2FeO3(s)
Explanation:
According to the question, a battery was used to light the steel wool by bringing the terminals very close together. When the battery came into contact with the steel wool, current was sent out through the thin wire. This caused the iron to heat up quite well.
Iron reacts with oxygen under these conditions as follows;
2Fe(s) + 3O2(g) --------> 2FeO3(s)
This is the chemical reaction that occurs when the steel wool is set on fire.
Chemical equation involved in Dr. Jeff's demonstration is
2 Fe+3 O₂[tex]\rightarrow[/tex]2 FeO₃
What is the effect of heating in chemical reactions?Battery is a device which helps in conduction of current. When a battery is used to pass a current through a substance in this case which is steel wool made up of iron it starts getting heated up.
The amount by which substance gets heated up is directly proportional to the current passing through it. As more current is passed through the battery it gets heated more.
During heating, the iron present in the steel wool reacts with oxygen to form iron oxide with iron present in the+3 oxidation state.When the heat exceeds a certain point the steel wool catches fire due to the heat generated. The heat causes the electrons present in steel wool of iron to move faster and collide with each other thus generating more heat.
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CAN SOMEBODY PLEASE HELP ME ANSWER THIS CORRECTLY?! (There’s only one option per term, I just really need help and I would appreciate it)
~TERMS~
1. Theory
2. Controlled
3. Variables
4. Hypothesis
5. Independent
6. Quantitative
~DEFINITIONS~
A.) a variable that stays the same during an experiment.
B.) All the things that can be tested and/or observed in an experiment.
C.) An explanation that best explains observable facts, has been well tested and is widely accepted.
D.) describing something using your senses.
E.) summary explaining whether or not the hypothesis was supported by the experimental results.
F.) the variable that changed after doing the experiment.
G.) the variable you choose to test.
H.) Using numbers or amounts to describe something.
I.) your prediction on how the experiment will turn out.
(Answer like 1a or 2b.) (I need answers for all 6 terms) if you help me, thank you like alot
Answer:
1: C
2: A
3: B
4: I
5: G
6: H
Explanation:
Please don't crucify me if I'm wrong ;-;
True or false A recent investigation found relatively high levels of the metalloid
arsenic in samples of apple juice. This would not be harmful
because arsenic is a stable metalloid.
Answer:
False
Explanation:
I took the quiz and got it right
How to calculate the mass of the sulfur (VI) oxide molecule
Explanation:
If you look back at the formula ( SO2 ), you can see that there is one sulfur and two oxygens present. Therefore, the molar mass of sulfur dioxide is [1 × 32.1 + 2 × 16.0] = 64.1 g/mol.
a compound has hydrogen ion and nitrate ion in solutionstate what is the name of that compound
Answer:
This compound is HNO2
Explanation:
HNO2 ----> H+ + NO2
When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.
What is chemical formula?
Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Therefore, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.
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If a sample of gas of valume 605 mL and temperature of 39 OC, has 0,00803 moles. What is it’s pressure?
Answer:
The pressure of the gas is 0.35 atm.
Explanation:
We can find the pressure of the gas by using the Ideal Gas Law:
[tex] P = \frac{nRT}{V} [/tex]
Where:
V: is the volume = 605 mL = 0.605 L
n: is the number of moles = 0.00803 moles
T: is the temperature = 39 °C = 312 K
R: is the gas constant = 0.082 L*atm/(K*mol)
Hence, the pressure is:
[tex] P = \frac{0.0083 moles*0.082 L*atm/(K*mol)*312 K}{0.605 L} = 0.35 atm [/tex]
Therefore, the pressure of the gas is 0.35 atm.
I hope it helps you!
why do stars appear to be bigger in the night?
Answer: in the daytime the sun is out so the stars are not visible becuase the suns reflection! At night When you gaze at the constellations, every star produces an image that's the same size, but your retina isn't sensitive enough to respond to the outer parts of those images except for the brighter stars — which therefore look bigger than the fainter ones.
Explanation:
This is what I found on goog.le a while ago now it might actually help if I’m wrong I apologiz, I hope this was your quistion!
The Faruq family uses 548 liters of water per day.
The Chammas family uses 3 times as much water
per day.
Answer:
11508 liters
Explanation:
The Faruq family uses 548 liters of water per day. The Chammas family uses 3 times as much water per day. How much water does the Chammas family use per week?
Solution:
The amount of water used by the Chammas family is three times that of the Faruq family per day, hence:
Amount of water used by Chammas family in a day = 3 * water used by Faruq family in a day
Amount of water used by Chammas family in a day = 3 * 548 = 1644 liters
The amount of water used by the Chammas family in a week = 1644 liters per day * 7 days in a week = 11508 liters
Therefore 11508 liters of water was used by the Chammas family in a week
Which substance has a melting point greater than room temperature
O A. argon
O B. oxygen
O
C. mercury
O D. aluminum
Aluminum is solid at room temperature and will, therefore, have a melting point that is above room temperature.
Melting pointThe room temperature is about 25 degrees Celsius.
Argon and oxygen are gases at room temperature.
Mercury is a liquid at room temperature.
Aluminum, on the other hand, is solid at room temperature. Hence, its melting point is definitely somewhere above room temperature.
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Lucy volunteers at an animal shelter, and she takes care of an orange tabby 1 point
cat and her kittens. Some of the kittens have orange markings, but some
have gray markings. What units of genetic material determine how living
things look?
Answer; the answer is variations
The unit of genetic material that determines how living things look is called variations, look below for more description.
What are genetic variations?Hereditary variety alludes to contrasts among the genomes of individuals from similar species. A genome is all the innate data — every one of the qualities — of a creature. Hereditary variety is the distinction in DNA successions between people inside a populace.
For example, the human genome contains somewhere close to twenty and 25 thousand qualities.
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How many grams of K2Cr2O7, are soluble in 100 g of
water at 95 °C?
Answer:
75 grams
Explanation:
At 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water.
What is solubility?The solubility of a substance in a particular solvent is the maximum amount of that substance that can dissolve in the solvent at a given temperature. The solubility of a substance can be affected by factors such as temperature, pressure, and the presence of other substances.
For K2Cr2O7, the solubility in water is highly dependent on temperature. At 95 °C, the solubility of K2Cr2O7 in water is approximately 75 g/100 mL. This means that at 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water. Since 100 g of water is equivalent to 100 mL, you can dissolve up to 75 grams of K2Cr2O7 in 100 g of water at 95 °C.
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4 Explain why some acids are safe to consume
while others are not.
Answer:
Household cleaners, antiseptics and battery juice are examples of toxic chemicals that you cannot consume because they have high acids concentrations. However some are very healthy such as critic acids found in oranges. :) Hope this helped.
Question 5 (5 points)
True or False. Open clusters are groups of up to a few thousand stars that are loosely held together by gravity and
tend to appear blue.
Answer:
have a p000000000000000000