One mole Hydrogen need 1/2mol O_2 .
Moles of Hydrogen
30u/1u30molMoles of O_2
30/215mol[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's get to the reaction first ~
[tex] \qquad \qquad \rm 2H_2 + O_2 \rightarrow 2H_2O[/tex]
Here, we can infer that if we need 1 mole oxygen gas to react with 2 moles Hydrogen gas.
So, the number of Oxygen gas molecules we need to react should be half the number of Hydrogen gas molecules.
Number of Hydrogen gas molecules is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{30}{2} [/tex]
[tex]\qquad \sf \dashrightarrow \: 15[/tex]
Number of Oxygen gas molecules needed is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} [/tex]
Number of Oxygen atoms needed :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} \times 2[/tex]
[tex]\qquad \sf \dashrightarrow \: {15} \: atoms[/tex]
One atom of Oxygen weight 16 u, so 15 atoms weight ~
[tex]\qquad \sf \dashrightarrow \: {15} \times 16[/tex]
[tex]\qquad \sf \dashrightarrow \: 240 \: u[/tex]
So, we need 240 u of Oxygen atoms to react completely with 30 u of Hydrogen atoms.
Examine the nuclear reaction: Superscript 1 subscript 1 H plus superscript 1 subscript 0 n right arrow superscript 2 subscript 1 H. Why is this classified as a nuclear reaction rather than a chemical reaction? It is not balanced. A new compound is formed. A change has occurred in a nucleus. A new element has been formed.
The reaction that is described in the question is a nuclear reaction because a change has occurred in a nucleus.
What is a nuclear reaction?The term nuclear reaction has to do with a reaction in which there is a transformation of the nucleus of an atom.
As such, the reaction that is described in the question is a nuclear reaction because a change has occurred in a nucleus.
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Answer:
C
Explanation:
Edge 2022
Reduction is a reaction that uses________to change a molecule into something else.
Answer:
chemical reaction
Explanation:
Reduction is the transfer of electrons between species in a chemical reaction where there is a process of gaining electrons or a decrease in the oxidation state by an element. A reduction chemical reaction involves increasing electrons associated with a single atom or a group of atom
What is the purpose of cross breeding or selective breeding
What clues indicate that a chemical reaction has occurred?
Choose all correct answers.
the formation of a new liquid
a color change
a temperature change
the formation of bubbles
Answer:
its probably all of the above, if not then it should be the formation of a new liquid, and a color change
Explanation:
The solubility of which substance is least affected by the temperature of the water
Answer:
solo esto se responderte
Explanation:
Algunos solutos (por ejemplo, cloruro de sodio (NaCl) en agua) exhiben una solubilidad bastante independiente de la temperatura. Unos pocos, como el sulfato de cerio (III) y el carbonato de litio, se vuelven menos solubles en agua a medida que aumenta la temperatura.
HELP ASAP PLEASE!!!!!!!Which statements describe what happens in a redox reaction? Check all that apply. A. One substance gains electrons and one substance loses electrons. B. Electrons are moved between two substances. C. There are two reduction reactions. D. The anions on two compounds trade places
Electrons are moved between two substances.
7. Diethyl ether burns in air according to the following equation. C4H10O(l) + 6O2 (g) → 4CO2 (g) + 5H2O(l) If 7.15 L of CO2 is produced at a temperature of 125°C and a pressure of 1.02 atm, what volume of oxygen, measured at STP, was consumed and what mass of diethyl ether was burned?
From the stoichiometry of the combustion reaction, we can see that 7.4 L of oxygen is consumed.
What is combustion?Combustion is a reaction in which a substance is burnt in oxygen. The equation of the reaction is; C4H10O(l) + 6O2 (g) → 4CO2 (g) + 5H2O(l)
We can obtain the number of moles of CO2 from;
PV = nRT
n = 1.02 atm * 7.15 L/0.082 atm LK-1mol-1 * (125 + 273) K
n = 7.29 /32.6
n = 0.22 moles
If 6 moles of oxygen produces 4 moles of CO2
x moles of oxygen produces 0.22 moles of CO2
x = 0.33 moles
1 mole of oxygen occupies 22.4 L
0.33 moles of oxygen occupies 0.33 moles * 22.4 L/ 1 mole
= 7.4 L of oxygen
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Please Hurry And Answer This Question! :)
Which Compound can be used to preserve biological specimens?
1/2/3?
Biological specimens are the preserved remains of the biological materials. Compound A. formaldehyde or formalin is used to preserve the specimens. Thus, option A is correct.
What are fluid-preserved specimens?Fluid preserved specimens are the biological material of the organism that are kept at the store to study and analyze over a long time without getting any damage. Formaldehyde along with alcohol is the most common preservative.
Formaldehyde is an organic compound that is colorless and pungent in the smell that preserves the dead remains of the organisms intact. It is antiseptic and germicide in nature that makes them best for the purpose.
Therefore, option A. formaldehyde is used to preserve the specimens.
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Answer:
so i put a...
Explanation:
Edge doesnt give correct answers on unit tests, but i passed with an 88 :)
Correct me if im wrong!!
Name these compounds according to IUPAC.
Answer:
10. Butanoic acid
11. Methylpropanoate
Explanation:
In this case first you need to identify the functional group,secondly identify the longest chain that contains the particular functional group:
10. The functional group for this compound is a carboxylic acid due to the "CHO2" group..we have four carbons which makes the parent chain to be butane.since it's acarboxylic acid we replace the "e" at the end to "oic acid".
11. The functional group is ester "RCOOR".For the ester the longest chain is counted from the part of the carboxylic acid which in this case is a propane,and the part from the alcohol becomes a substituent. With esters you replace the "e" at the end of the parent name to "oate". When you write it down you begin with the substituent in this case "methyl" and the rest follows...
hope it is clear enough
Chemical labels must contain a product identifier, signal word and a pictogram to represent the hazards. what other information is required on a chemical label?
Answer:
The HCS now requires the following elements on labels of hazardous chemicals: Name, Address and Telephone Number of the chemical manufacturer, importer or other responsible party
Explanation:
I tried, I think this is the correct answer.
Select the structure that corresponds
to the molecule name:
4-heptanone
A.
B.
O
CH3CH₂CH₂CCH₂CH3
C. both
The structure that corresponds to the molecule name - 4-heptanol would be option A.
Structure of 4-heptanolThe name, 4-heptanol, indicates that there are 7 carbon atoms in the structure.
In addition, there is also an indication that there is a functional group on the 4th carbon - the alcohol functional group.
Option B has only 6 carbon atoms instead of 7. Option A, on the other hand, fulfills all the criteria.
Thus, A is the correct structure of 4-heptanol.
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If the concentration of H+ is 4.29 x 10-4 M, what is the pH?
pH = - log [H⁺]
pH = - log 4.29 x 10⁻⁴
pH = 4 - log 4.29
5. Elements are different because they contain different numbers of protons.
Answer:
True
Explanation:
The number of electrons are what determine an atom.
The number of electrons = number of protons
so the elements are different.
If the number of neutrons are different but the number of electrons and protons are same they are of the same element.
But here the number of protons are different so this is another element.
What are some differences between pure substances and mixtures?
Answer:
. a pure substance consists only of one element or one compound.
. a mixture consists of two or more different substances, not chemically joined together
If 30.5 g of 15% potassium nitrate solution are reacted to excess magnesium chloride how many grams of potassium chloride will be form
5. Consider the following experiment: A block of iron with an initial mass of 50 g is placed in a sealed container of pure oxygen. After several days, the block is red in color and has a mass of 74 g. Are these observations a violation of the law of conservation of mass? Justify your answer.
The observation in the illustration remains in accordance with the law of conservation of mass assuming that moisture is present in the container.
What is the law of conservation of mass?The law state that mass can neither be created nor destroyed. However, mass can be converted from one form to another.
In this case, the ion was placed in a container of pure oxygen. Assuming that moisture is present, iron reacts with oxygen to form rust according to the following equation:
[tex]4Fe + 3O_2 + 6H_2O --- > 4Fe(OH)_3[/tex]
The rust formed will weigh more than the initial weight of the iron.
Without the presence of moisture, one can effectively conclude that the observation violates the law of conservation of mass.
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3. related to the amount of energy a wave carries and is
measured from the top or bottom of the wave to the middle
a. frequency
b. wavelength
c. amplitude
Answer:
c
Explanation:
because is the measurement of amplitude
What is the mass of 61.9 L of oxygen gas collected at STP?
a 122 g 02
b 2.76 g 02
C 88.4 g 02
d 44.2 g 02
Answer:
D. 44.2 g O₂
General Formulas and Concepts:
Gas Laws
Stoichiometry
Dimensional AnalysisMole RatioExplanation:
Step 1: Define
Identify given.
61.9 L O₂ at STP
Step 2: Convert
We know that the oxygen gas is at STP. Therefore, we can set up and solve for how many moles of O₂ is present:
[tex]\displaystyle 61.9 \ \text{L} \ \text{O}_2 \bigg( \frac{1 \ \text{mol} \ \text{O}_2}{22.4 \ \text{L} \ \text{O}_2} \bigg) = 2.76339 \ \text{mol} \ \text{O}_2[/tex]
Recall the Periodic Table (Refer to attachments). Oxygen's atomic mass is roughly 16.00 grams per mole (g/mol). We can use a mole ratio to convert from moles to grams:
[tex]\displaystyle 2.76339 \ \text{mol} \ \text{O}_2 \bigg( \frac{16.00 \ \text{g} \ \text{O}_2}{1 \ \text{mol} \ \text{O}_2} \bigg) = 44.2143 \ \text{g} \ \text{O}_2[/tex]
Now we deal with sig figs. From the original problem, we are given 3 significant figures. Round your answer to the exact same number of sig figs:
[tex]\displaystyle 44.2143 \ \text{g} \ \text{O} \approx \boxed{ 44.2 \ \text{g} \ \text{O}_2 }[/tex]
∴ our answer is letter choice D.
---
Topic: AP Chemistry
Unit: Stoichiometry
When a chemical cold pack is activated, it becomes cool to the touch. What is happening in terms of energy?.
Answer:
An exothermic reaction is happening, it is absorbing the cold.
Fluorine-21 has a half-life of approximately 5 seconds. what percentage of the original nuclei would remain after 15 seconds
Answer:
1/8th = 12.5%
Explanation:
Three half lives would be 1/2 * 1/2 * 1/2 = 1/8 th of original
A fish has armored plates that enable it to handle the extreme pressure in the deepest, darkest aquatic ecosystem. Where is this fish adapted to live? a pond the open ocean the neritic zone an estuary.
Draw two lewis structures for a compound with the formula c4h10. No atom bears a charge, and all carbon atoms have complete octets. Include all hydrogen atoms.
Answer:
See pictures!
Explanation:
Here is a drawing of butane (C4H10); labeled #1. An isomer of butane will also have the chemical formula C4H10 but is depicted different geometrically. I labeled this one #2.
HELP ME PLEAS FAST.
Which statement describes how heat is transferred by convection?
Question 4 options:
Air molecules touch the warm ground, heating them up
Warm air rises and cool air sinks
Sunlight travels through space
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Convection is a method of heat transfer that causes heat to be transferred from one object to another object with being in actual contact but I same atmosphere.
So, the correct phenomenon that describes how heat is transferred by Convection is :
Statement 2. Warmer air rises and copl air sinks.
WILL GIVE BRAINLIEST What would the products of a double-replacement reaction between LiCl and MgO be? (Remember: In double-replacement reactions, the two cations switch places and the two anions switch places.)
What is the molarity of a solution that contains 25 g of hcl in 150 ml of solution? (the molar mass of hcl is 36.46 g/mol.) what should you find first?
Answer: 4.6 M
Explanation:
Converting 25 g of HCl to moles, we get 25/36.46 = 0.68568294020845 moles.
Also, 150 mL = 0.150 L
So, the concentration is:
[tex]\frac{0.68568294020845}{0.150} =\boxed{4.6 \text{ M}}[/tex]
Answer:
Part 1. First, you find the Moles.
Part 2. The correct setup for finding the moles is: 25g HCI x 1mol HCI/36.46g HCI
Part 3. The correct setup to find liters is: 150 mL x 1L/1000mL
Part 4. The molarity of this solution is: 4.6 M HCI
Explanation:
just listen lol
how many grams of sodium Phosphate is needed to prepare 5.0 L of a 2.6M solution ?
Molarity is the ratio of the moles and the volume. The mass of 2.6 M sodium phosphate solution is 2131.22 gms.
What is mass?
Mass is the product of the moles and the molar mass of the substance. It is given as,
Mass = Moles × Molar mass
The moles from molar concentration is used to calculate mass as:
Mass = Molarity × volume × molar mass
= 2.6 × 5.0 × 163.94
= 2131.22 gms
Therefore, 2131.22 gms is the mass of sodium phosphate.
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What is the major defining property of gasses?.
Answer:
Gases have no definite shape or volume. They are fluid, allowing particles/molecules to move freely.
The behavior of a gas is that the volume changes directly with temperature. With a constant volume, the pressure will be directly proportional to the amount of gas.
Explanation:
These are some of the properties I can think of
The reactions listed below are either chemical reactions or nuclear reactions. which are nuclear reactions? check all that apply. upper h superscript plus, plus upper o upper h superscript minus right arrow upper h subscript 2 upper o. superscript 185 subscript 79 upper a u right arrow superscript 181 subscript 77 upper r d plus superscript 4 subscript 2 upper h e. 4 upper f e plus 3 upper o subscript 2 right arrow 2 upper f e subscript 2 upper o subscript 3. superscript 210 subscript 84 upper p o right arrow superscript 206 subscript 82 upper p b plus superscript 4 subscript 2 upper h e.
The equations that are nuclear reactions are as follows:
superscript 185 subscript 79 upper Au right arrow superscript 181 subscript 77superscript 210 subscript 84 upper Po right arrow superscript 206 subscript 82 upper Pb plus superscript 4 subscript 2 upper He.What is nuclear reaction?A nuclear reaction is a reaction that involves the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.
The products of a nuclear reaction may contain a different element or a different isotope of the same element.
Therefore, the equations that are nuclear reactions are as follows:
superscript 185 subscript 79 upper Au right arrow superscript 181 subscript 77superscript 210 subscript 84 upper Po right arrow superscript 206 subscript 82 upper Pb plus superscript 4 subscript 2 upper He.Learn more about nuclear reaction at: https://brainly.com/question/19752321
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Answer:
b. Reaction B involves a greater change and a change in element identity.
Explanation:
i got it wrong
Water cools from 2oc to -2oc. during this time, what happens to the motion of the molecules?
Answer:
The motion of the molecules remains the same.
Express your opinion for or against the theory of evolution
Explanation:
Critics of evolution commonly appeal to past scientific hoaxes such as the Piltdown Man forgery. It is argued that because scientists have been mistaken and deceived in the past about evidence for various aspects of evolution, the current evidence for evolution is likely to also be based on fraud and error.
