Answer:
Changing two or more variables makes it difficult to find a cause and effect relationship.
please help n let me know thank u
A 3.90 L sealed vessel under vacuum is filled with 6.40 g of fluorine gas. What is the pressure (in kPa) of the vessel at 25.0 ⁰C ?
From the ideal gas law, the pressure of the gas is 106 kPa.
First we must obtain the number of moles of the gas;
Number of moles = mass/molar mass
Molar mass of fluorine gas = 38 g/mol
Number of moles of F2 = 6.40 g/38 g/mol = 0.168 moles
Using the ideal gas equation;
PV = nRT
P = ?
V = 3.90 L
n = 0.168 moles
T = 25.0 ⁰C + 273 = 296 K
R = 8.314 kPa L K-1 mol-1
Substituting values;
P = nRT/V
P = 0.168 moles × 8.314 kPa L K-1 mol-1 × 296 K/3.90 L
P = 106 kPa
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The pressure of the vessel at a temperature of 25 °C is 106.73 KPa
We'll begin by calculating the number of mole of fluorine gas. This can be obtained as follow:
Mass of F₂ = 6.40 g
Molar mass of F₂ = 19 × 2 = 38 g/mol
Mole of F₂ =?Mole = mass / molar mass
Mole of F₂ = 6.40 / 38
Mole of F₂ = 0.168 moleFinally, we shall determine the pressure. This can be obtained as follow:
Volume (V) = 3.90 L
Temperature (T) = 25.0 °C = 25 + 273 = 298 K
Mole of F₂ (n) = 0.168 mole
Gas constant (R) = 8.314 L.KPa/Kmol
Pressure (P) =?PV = nRT
P × 3.9 = 0.168 × 8.314 × 298
P × 3.9 = 416.232096
Divide both side by 3.90
P = 416.232096 / 3.90
P = 106.73 KPaTherefore, the pressure of the vessel is 106.73 KPa
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Two carbon atoms (Group 14) bond with two hydrogen atoms (Group 1) to form acetylene (C2H2). How would each carbon atom in acetylene bond?(1 point)
A) Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.
B) Each carbon atom would share one pair of electrons with hydrogen and one pair with the other carbon atom.
C) Each carbon atom would share one pair of electrons with the other carbon atom and three pairs with each hydrogen atom.
D) Each carbon atom would share one pair of electrons with the other carbon atom and two pairs with each hydrogen atom.
Is the molecule H2+ stable?
Answer: yes it is
Explanation:Bond order
The antibonding orbital is empty. Thus, H2 is a stable molecule
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Match each example to the type of wave.
B. Longitudinal wave
A. Transverse wave
C. Combination of longitudinal and transverse wave
D. Infrared wave
E. Radiant energy
F. Microwaves
G. Ultraviolet waves
Answer: These are all examples of the waves you listed
B- Soundwave, ultrasound waves
A-Surface ripples on water
C- water waves
D-The heat that we feel from sunlight, a fire, a radiator or a warm sidewalk is infrared.
E-The heat emitted from a campfire.
F-Long Distance Wireless Transmission. Most wireless transmission systems are based on microwave technology.
G- Disinfectants
Explanation:
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Have a nice day!
What are the substances you start with in a chemical reaction called?
A. The intermediates
B. The products
C. The mixture
D. The reactants
What is the mass of 2.3 x 10²¹ atoms of bromine?
Answer:0.305g
Explanation:
mass = 79.9x(2.3 x 10^21) / (6.02 x 10^23)
= 0.305
which of the following is not true for chemical change
Answer:
"They can be reversed by physical changes."
Explanation:
A chemical change can form a new substance, can be detected by the change in color and they have properties different from their starting materials.
What is the volume of water needed to prepare 5000 ml of 0.1 M HCL from a stock solution of4 M
e) 125 ml
b) 375 ml
c) 500 ml
d) none of them
Hey There :
Volume initial = ?
Volume final = 5000 mL
Molarity initial = 4 M
Molarity final = 0.1 M
Therefore :
Mi * Vi = Mf * Vf
4 * vi = 0.1 * 5000
4 vi = 500
Vi = 500 / 4
Vi = 125 mL
Answer A
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Answer:
any form of water that falls from the sky
Why is the periodic table not arranged by atomic weight and instead arranged by atomic number?
At before Duberinor,Mendeleev tried to use atomic weight but they failed .
A student sets up a titration apparatus with 25 mL of potassium. hydroxide in the flask. In three to five sentences, explain how the student can use a 0.1 M solution of hydrobromic acid to determine the concentration of potassium hydroxide in the reaction.
The concentration of 25 mL of potassium hydroxide can be determined from 0.1 M solution of hydrobromic acid by titration.
Titration involves the process by which the concentration of an unknown solution is determined by reaction a known volume of the unknown solution with a carefully measured volume of a standard solution. By determining the volume of the standard solution required to react completely with the solution of unknown concentration, its concentration can be accurately determined by calculation.
In order to determine the concentration of 25 mL of potassium hydroxide, this volume of solution is put into a conical flask and titrated against a known volume of 0.1 M solution of hydrobromic acid. At the end point, usually signified by a color change, the concentration of the 25 mL of potassium hydroxide solution can be calculated from the stoichiometry of the reaction.
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helpppppppppppppppppppppppppppp
Answer:
1)
Explanation:
ok this is a write answer
The temperature at which a solid melts is the same as the temperature at which its liquid form solidifies (true or false)
Answer:
True I think so
Explanation:
I have asked question in my profile please tell me the answer
According to the periodic table, which two elements have an atomic mass less than twice their atomic number?
Answer:
Hydrogen and oxygen
Explanation:
Hydrogen
2 × atomic number = 2
atomic mass = 1.008 amu
Oxygen
2 × atomic number = 16
atomic mass = 15.999 amu
Define physical and chemical properties, provide three examples of each, discuss their reversibility, and
explain the fundamental differences between them.
Pure iron, Fe , can be produced from an ore called hematite, Fe2O3 , by reaction with carbon at high temperatures. 2Fe2O3+3C⟶4Fe+3CO2 How many tons of hematite must react with carbon if an iron company needs to make 49 tons of iron?
70 tons of hematite (Fe₂O₃) is needed to produce 49 tons of iron (Fe).
We'll begin by calculating the tons of hematite (Fe₂O₃) that reacted and the tons of Fe produced from the balanced equation. This is illustrated below:
2Fe₂O₃ + 3C —> 4Fe + 3CO₂
Molar mass of Fe₂O₃ = (56×2) + (16×3) = 160 g/mol
Mass of Fe₂O₃ from the balanced equation = 2 × 160 = 320 g
Divide by 907185 to express in ton
320 / 907185 = 0.000353 ton
Molar mass of Fe = 56 g/mol
Mass of Fe from the balanced equation = 56 × 4 = 224 g
Divide by 907185 to express in ton
224 / 907185 = 0.000247 ton
SUMMARYFrom the balanced equation above,
0.000353 ton of Fe₂O₃ reacted to produce 0.000247 ton of Fe.
Finally, we shall determine the tons of hematite (Fe₂O₃) needed to produce 49 tons of Fe. This can be obtained as follow:
From the balanced equation above,
0.000353 ton of Fe₂O₃ reacted to produce 0.000247 ton of Fe.
Therefore,
X ton of Fe₂O₃ will react to produce 49 tons of Fe i.e
X ton of Fe₂O₃ = [tex]\frac{0.000353 * 49}{0.000247} \\\\[/tex]
X ton of Fe₂O₃ = 70 tons
Thus, 70 tons of hematite (Fe₂O₃) is needed to produce 49 tons of Fe.
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4. The cup is a volume widely used by cooks in the UAE. One cup is equivalent to 237 mL.
a. If 1 cup of olive oil has a mass of 216 g, what is the density of olive oil in kg/mL?
b. Convert the density from part A to kg/mL. Write your answer in scientific notation.
Taking into account the definition of density and scientific notation, the density of olive oil is 0.000911 [tex]\frac{kg}{mL}[/tex] or 9.11×10⁻⁴[tex]\frac{kg}{mL}[/tex]
Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. That is, density is the relationship between the weight (mass) of a substance and the volume it occupies.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this case, you know that:
mass= 216 g= 0.216 kg (being 1000 g= 1 kg)volume= 237 mLReplacing in the definition of density:
[tex]density=\frac{0.216 kg}{237 mL}[/tex]
Solving:
density= 0.000911 [tex]\frac{kg}{mL}[/tex]
On the other side, scientific notation is a quick way to represent a number using powers of base 10.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number. n = a whole number, which is called an exponent or an order of magnitude. Represents the number of times the point decimal is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.In this case, the density expressed in scientific notation is: 9.11×10⁻⁴[tex]\frac{kg}{mL}[/tex]
In summary, the density of olive oil is 0.000911 [tex]\frac{kg}{mL}[/tex] or 9.11×10⁻⁴[tex]\frac{kg}{mL}[/tex]
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about density: brainly.com/question/952755?referrer=searchResults brainly.com/question/1462554?referrer=searchResultsscientific notation: brainly.com/question/18073768?referrer=searchResultsPlease help me. I can’t give too much points bc I don’t have too much.
QUANTUM=
The relationship between energy and frequency=
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Albert Einstein: PHOTONS
1. What is the shape of an organic molecule containing a triple bond with respect to the carbons on either side of the bond?
Explain your answer
Answer:
The alkyne is linear
Explanation:
Any molecule with a triple bond is considered an alkyne. In regards to the shape, because carbon can only bond to 4 different atoms at once a triple bond fills in 3 of the required 4 atoms needed to reach the molecules ground state (when it's most stable). The more electrons shared between atoms, the shorter the bond will be which results in a stronger and more linear line. Keep in mind a quadruple bond is not possible between carbons as of now.
Which of these is a common to all chemical changes
A) A new change of sate occurs
B) A change of color occurs
C) a new substance is produced
D) heat is released into the air
Answer:
c
a new substance is produced
Using the standardized NaOH solution in the previous
question, the titration of 5.00 mL of vinegar required
42.25 mL of NaOH. What is the % of acetic acid in the
vinegar? Previous standardized NaOH solution = 0.098
Answer: Using the standardized NaOH solution in the previous question, the titration of 5.00 mL of vinegar required 42.25 mL of NaOH. What is the % of acetic acid in the vinegar? Concentration of NaOH from previous question= 0.0986 M. David C.
Explanation:
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The percentage of acetic acid in vinegar is 4.988 %., When the titration of 5.00 mL of vinegar required 42.25 mL of NaOH.
What is titration?Titration is defined as the process of chemical analysis method in which the amount of a sample's constituent is determined by mixing a precisely measured amount of the desired constituent with another material in a precise, known proportion. The equivalence point, or the point at which chemically equivalent amounts of the reactants have been combined, is to be detected by the titration.
According to the titration principle, V1=the volume of acetic acid and V1S1=V2S2
S1 is the acetic acid's strength
V1 = 42.25 ml * 0.0986 M / 5 ml = 0.833 M where V2 = Volume of NaOH S2 = Strength of NaOH
Hence, 1000 ml Vinegar contains 0.833 moles of acetic acid per 100 ml of vinegar (0.0833*60). G=4.998 grams of acetic acid
The amount of acetic acid in vinegar is 4.988%.
Thus, the percentage of acetic acid in vinegar is 4.988 %., When the titration of 5.00 mL of vinegar required 42.25 mL of NaOH.
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what is the difference between exergonic and exothermic reactions?
Answer:
An exergonic reaction is a type of chemical reaction that releases free energy to the surroundings. The final state of this reaction is less than its initial state. ... “Exothermic” literally means “outside heating” while “exergonic” literally means “outside work.”
Explanation:
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When two atoms bond chemically it is because of the interaction between
A) the nuclei of each atom.
B) the protons in each atoms.
C) all electrons in the atoms.
D) the valence electrons in each atom.
Answer:
C
Explanation:
It depends on the bonding for an explanation.
If one atom is a metal and one is a non metal it will be ionic. This is because one atom transfers its electron to the other atom giving them both a charge. They will then be bonded due to opposite forces of attraction.
If both atoms are non metals it will be covalent. Electrons pair together in the center of two atoms that have merged together and they share their electrons.
(Makes more sense with diagrams)
what is the resonance structure of ch3
Answer:
For the CH3- structure use the periodic table to find the total number of valence electrons for the CH3- molecule. Once we know how many valence electrons there are in CH3- we can distribute them around the central atom with the goal of filling the outer shells of each atom.
In the Lewis structure of CH3- structure there are a total of 14 valence electrons.
Also note that you should put the CH3- Lewis structure in brackets with as 1- on the outside to show that it is an ion with a negative one charge.
----- Steps to Write Lewis Structure for compounds like CH3- -----
1. Find the total valence electrons for the CH3- molecule.
2. Put the least electronegative atom in the center. Note: Hydrogen (H) always goes outside.
3. Put two electrons between atoms to form a chemical bond.
4. Complete octets on outside atoms.
5. If central atom does not have an octet, move electrons from outer atoms to form double or triple bonds.
Lewis Structures, also called Electron Dot Structures, are important to learn because they help us understand how atoms and electrons are arranged in a molecule. This can help us determine the molecular geometry, how the molecule might react with other molecules, and some of the physical properties of the molecule (like boiling point and surface tension).
Explanation:
CH3CNO can be represented by at least three different but valid Lewis structures called resonance forms, or resonance structures, shown below.
What Group is this atom located use a number only
*
PLEASE HELP!!!!! WILL GIVE BRAINLIEST!!!!
The answer should be A
VisibleVisible wave length visible wavelength of light that are emitted by Adams can be used to get Nate explosive devices remotely
When doing medical research with human subjects, which four limitations are unavoidable?
Answer:
Answer
The limitations are-
1. Privacy of the individuals involved in the research process.
2. Physical and psychological risks should be minimized
3. The subjects should be chosen equitably
4. Only reasonable exposure to risks is admissible.
Explanation
The privacy of the individuals involved in the research must be taken into consideration. This will ensure safety of patient data and information. The risk of physical and physiological well being of the person must be taken into consideration in such a research. In addition to that, the subject must be made to understand every procedure and the risks involved before testing. Moreover, only minimal exposure to risks is allowed and must have been previously tested in animals to avoid deaths.
2.When copper (II) nitrate reacts with sodium hydroxide, copper (11) hydroxide is produced.
How many grams of copper (11) hydroxide can be prepared from 2.7 g of copper (II) nitrate
reacting with sodium hydroxide?
Answer:
2Cu + S ~~~> Cu2S Copper (C) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction.
Explanation:
PLEASE EXPLAIN I KNOW THE ANSWER I NEED AN EXPLAINATION
The potential energy as a function of internuclear distance for three diatomic molecules, X2, Y2, and Z2, is shown in the graph above. Based on the data in the graph, which of the following
From the graph shown, Y2 = N2, X2 = O2, Z2 = H2.
When atoms of elements are at a large distance from each other, the potential energy of the system is high. However, as the atoms approach each other, the potential energy of the system decreases steadily. The closer the atoms come to each other, the lower the potential energy. This implies that potential energy is proportional to bond length.
Since N2 has a shorter bond length and higher energy, Y2 must be N2. The bond energy of hydrogen is small hence H2 must be X2. The bond energy of a double bond is intermediate between that of a single and triple bond hence Z2 must be O2.
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