Answer:
Brownian moment means zig-Zag motion of particals Randomly anywhere in the free space or in fluids
What are the steps for writing the formula for a molecular compound? Naming a molecular
compound?
Answer:
Your question was explained in my chemistry book so I just shared the picture
Hope that helps
An iron block of mass 18 kg is heated from 285 K to 318 K. If 267.3 kJ is required, what is the specific heat of iron?
A. 490.05
B. 158.77
C. 145.80
D. 450.00
Answer:
D. 450 J/kgK
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where:
Q = amount of heat absorbed/released (J)
m = mass of substance (g)
c = specific heat capacity
∆T = change in temperature (°C)
According to the information provided in this question:
Q = 267.3 kJ = 267300J
m = 18kg
∆T = 318K - 285K = 33K
c = ?
Q = m × c × ∆T
c = Q ÷ m∆T
c = 267300 ÷ 18 × 33
c = 267300 ÷ 594
c = 450 J/kgK
Hands moving on a battery-operated clock is an example of what kind of
energy conversion?
A. Heat energy being converted to gravitational potential energy
B. Gravitational potential energy being converted to heat energy
C. Chemical potential energy being converted to kinetic energy
D. Kinetic energy being converted to chemical potential energy
Answer:
Chemical potential energy being converted to kinetic energy
Explanation:
A chemical bond formed when two atoms share two pairs of electrons is a ________ bond; it is best described as ________.
Answer:
A chemical bond formed when two atoms share two pairs of electrons is a double bond; it is best described as a covalent bond.
Explanation:
A chemical bond in which two pairs of electrons are shared has to be defined as covalent since ionic bonds don't involve electron sharing. They consist only of electrostatic attraction between ions.
Which of the following could be classified as a molecular element?
Question 1 options:
krypton
lithium
nitrogen
calcium
All four are classified as molecular elements.
Answer:
calcium is the correct answer to the question
How to identify polar molecules
Answer:
Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out
Explanation:
How many cm3 in a L?
Help me please I really need this tomorrow
Answer:
answers:
1.b
2.d
3.b
4. c
5.c
6.d
7.c
Explanation:
I think this is the correct answer pls mark brainliest and like..
19. place moth balls in the closet and observe after several days.
20. whenever wax or a candle burns it turns from solid to liquid but again at room temperature it turns to solid
21. evaporation, condensation, precipitation
22. it produces new substances
23. vinegar Bubbles when baking soda is added.
24. steam
which of the following pairs are ionic compounds ( Al,Cl),(Na,O),(Al,F)
Answer:
This answer I think it is Al,F
What is the frequency of a wave that has a wavelength of 28 m? c = λυ where c = 2.998 x 108 m/s
a. 1.07 x 107 Hz
b. 2.3 x 107 Hz
c. 10 Hz
d. 10.7 Hz
Answer:
The frequency of a wave that has a wavelength of 28 m is 1.07*10⁷ Hz.
Explanation:
Wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
The propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave's disturbance propagates along its displacement. Relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f * λ.
Being:
v= 2.998*10⁸ m/sf= ?λ= 28 mReplacing:
2.998*10⁸ m/s= f* 28 m
Solving:
[tex]f=\frac{2.998*10^{8}m/s }{28m}[/tex]
f= 1.07*10⁷ Hz
The frequency of a wave that has a wavelength of 28 m is 1.07*10⁷ Hz.
Which best describes a swimming pool?
A.
It is a solute.
• B.
It IS
solvent.
C.
It is solution.
D.
It is a reactant.
•
E.
It is a product.
Answer:
Swimming pool is an example of solution
Explanation:
It has water (solvent) and dissolve ion (solute)
Answer:
it is a solution
Explanation:
the combining of (water and Cl and other pool chemicals) make it a solution.
i need to know soon. HELP
PLEASE
Answer:
D..
carbonate and sulphate
The prosecution offers a lab report prepared by a government chemist who examined a white powdery substance seized from a box at Mary's house. The report indicated that the chemist used standard procedures in the analysis of the white substance, and the chemist prepared the report in the ordinary course of business. The report reflects the chemist's conclusion that the substance contained methamphetamine. Write a few sentences characterizing the report as either testimonial or nontestimonial hearsay.
Answer: The report prepared is a nontestimonial hearsay.
Explanation:
The nontestimonial hearsay can be defined as the expert opinion or statement given casually and not for the purpose of keeping or considering it as record by the government agent or agency. Here the given conclusion provided by the chemical expert is an example of nontestimonial hearsay because it is not the output of experimental and analytical procedures instead it is a casual opinion. Testimonial hearsay include the evidences that are based on detailed and thorough analytic procedures.
Consider the balanced reaction below:
2HBr + Ba(OH)2 → BaBr2 + 2H2O
How many moles of barium
hydroxide, Ba(OH)2, would be
required to react with 117 g hydrogen bromide, HBr?
Answer:
0.723 moles (5 s.f.)
Explanation:
Whenever there is a chemical equation, ensure that it is balanced. This is because a balanced chemical equation tells us the mole ratio (not the ratio of their masses), which means the relationship of the number of moles of reactants or products with one another.
The chemical equation given has already been balanced. Looking at the coefficients of HBr and Ba(OH)₂, the mole ratio of HBr to Ba(OH)₂ is 2: 1.
• 1 mole of Ba(OH)₂ is needed to react with 2 mole of HBr
Find the number of moles of HBr present:
Number of moles= mass ÷mr
Amount of HBr
= 117 ÷(1 +79.9)
= 1.4462 moles (5 s.f.)
Since the amount of Ba(OH)₂ required is half the amount of HBr present,
amount of Ba(OH)₂ required
= 1.4462 ÷2
= 0.723 moles (3 s.f.)
Notes:
• mr
= relative molecular mass
= sum of relative atomic masses (which can be found in the periodic table) in a molecule
The number of Atoms present in one mole of an element is equal to Avogadro Number. Which One Of the Following contains the greatest number of Atoms? (1)4g He (2)46g Na (3)0.40g Ca (4) 12g He
Answer:
Thus, the element containing the greatest number of atoms is 12 g He. Thus, the correct option is (4) 12 g He. Note: The number of atoms of a compound is Avogadro's number for 1 mole of compound. The number 6.022×1023 is known as Avogadro's number.
Explanation:
(4)✔️ 12 g He
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iammallikaAnswer:
120gram I think so this is the answer if the answer is correct plz mark me as brainliest.
Using the diluted solution from the 100-mL volumetric flask, rinse a 1-mL vol. pipet with a few drops and then pipet exactly 1.00-mL into a 50-mL volumetric flask. (Take care not to pipet any solids.) Fill the 50-mL volumetric flask to the mark with acidic FeCl3 solution. Cap and invert to mix the solution. What color is the solution
Answer:
The color of the solution turned a clear brown sort of a copper color
Explanation:
The color of the solution turned a clear brown sort of a copper color.
This is because ASA and the FeCl3 are reacting in a manner that it is resulting in the creation of a metal.
It is known that oxygen contains 1 percent of the air. If 50 liters of wind, how much oxygen is needed? *
Answer:
25 PRECENT
Explanation:
what is chemical reaction?
Answer:
a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
Or
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
What is the Law of Octaves?
A. The rule used to compose a poem of eight lines
B. Law describing the special properties of elements within eight electrons in the outer shell.
C. Each note has a series of eight sub notes increasing in variation between it and the next notes.
D.When ordered by atomic mass every eight elements has similar properties
i believe the answer would be D. When ordered by atomics mass every eighth element has similar properties.
3. If there were multiple products comment on finding the mixture melting point of the products. Does your sample appear to be a mixture or pure
Answer:
If there were multiple products, we can take each product and mixed with a sample of a pure compound that we suspect might be the same as the product. Then, we taking the melting point of this mixture that contains one of our product and pure sample. Then, we can observe the change in melting point, if there is no change in melting point or the melting stays in the same range of the pure compound. Then, the that product along with the pure sample are actually the same compound, not a mixture of two compounds. However, if the melting point for our pure sample compound changed or didn't stay in the same range after the mixing with on of our products. then we can conclude that this product and the pure sample are completely different compound, and indeed they are a mixture.
How many grams of ammonia can be produced from reacting a 450 L sample of nitrogen gas at a temperature of 450 K and a pressure of 300 atm?
Answer: The mass of ammonia is 124457.96 g which can be produced from reacting a 450 L sample of nitrogen gas at a temperature of 450 K and a pressure of 300 atm.
Explanation:
Given: Volume = 450 L
Temperature = 450 K
Pressure = 300 atm
The reaction equation is as follows.
[tex]N_{2} + 3H_{2} \rightarrow 2NH_{3}[/tex]
Here, 1 mole of nitrogen reacts to give 2 moles of ammonia.
From the given data, moles of nitrogen are calculated as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into the above formula as follows.
[tex]PV = nRT\\300 atm \times 450 L = n \times 0.0821 L atm/mol K \times 450 K\\n = \frac{300 atm \times 450 L}{0.0821 L atm/mol K \times 450 K}\\= \frac{135000}{36.945}\\= 3654.08 mol[/tex]
For 3654.08 moles of nitrogen, the moles of ammonia produced is as follows.
[tex]2 \times 3654.08 mol\\= 7308.16 mol[/tex]
Therefore, mass of ammonia (molar mass = 17.03 g/mol) is calculated as follows.
[tex]Moles = \frac{mass}{molarmass}\\7308.16 mol = \frac{mass}{17.03 g/mol}\\mass = 124457.96 g[/tex]
Thus, we can conclude that the mass of ammonia is 124457.96 g which can be produced from reacting a 450 L sample of nitrogen gas at a temperature of 450 K and a pressure of 300 atm.
In the hydrogenation of double bonds, a catalyst is needed. In the third step, the reactants react to form the product. This step is known as
Answer:
reaction
Explanation:
A reaction is defined as a process where the chemical transformation takes place from one form to some other form. Here, two different chemical substances are reacted together to form some other completely different product.
A hydrogenation process is a chemical process where between the molecular hydrogen and some another element or a compound. This process is usually carried out in the presence of catalyst mainly nickel, platinum or palladium.
Thus, in hydrogenation of a double bond, the catalyst is used to speed up the reaction. The first step in this process is adsorption process, the second step is the diffusion process, the third step is the reaction process and the last step is the desorption process.
ASAP PLEASE HELP What is the wavelength of a photon with a frequency of 6.56 x 1014 Hz?
A. 197 nm
B. 457 nm
O C. 303 nm
D. 435 nm
Answer:
B. 47 nm is the wavelength of a photon with a frequency of 6.56 x 1014 Hz.
Answer:
B. 457 NM ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
A student distills a sample of ink. Devise a simple method to show that the liquid collected is pure water. Include the expected results in your answer.
Answer:
Distillation
Explanation:
Water vaporizes at lower temperature than the ink pigment so if you heat them, the water evaporates, leaving the ink pigment in the flask
Not sure how to answer this:
A. Identify the side that is acidic
B. Explain why it's acidic
C. Identify the side that is basic
D. Explain why this side is basic
Answer:
A. The red side is acidic.
B. Because it has more positive hydrogen ions.
C. The blue side is basic.
D. Because it has more negative hydroxide ion.
Given the data from the question,
A. The side with more H⁺ is acidic
B. It is acidic because it contains more H⁺
C. The side with more OH¯ is basic
B. It is basic because it contains more OH¯
What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
pH scaleThe pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.
The scale ranges from 0 to 14 indicating:
0 to 6 indicates acid 7 indicates neutral 8 to 14 indicate basicHow to determine which side is acidic.The presence of H⁺ indicates acidity.
Thus, the side with more H⁺ is acidic.
How to determine which side is basicThe presence of OH¯ indicates the solution is basic.
Therefore, the side with more OH¯ is basic
Learn more about pH:
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During an experiment, solid iodine was placed in a sealed container. The container was gradually heated and purple-colored vapors of iodine formed were observed. Describe this system when it reaches phase equilibrium.
Answer:
See explanation
Explanation:
A system is said to have attained dynamic equilibrium when the rate of forward reaction and the rate of reverse reaction are equal.
Considering the system under consideration;
I2(s)⇄I2(g)
Heating the container converts solid iodine to purple coloured iodine vapour.
At equilibrium, there will be no net change in the amount of solid iodine and iodine vapour present in the system because the two processes (forward and reverse reactions) occur at the same rate at equilibrium.
How is each nucleotide different from the others?
A. It has different bases.
B. It has different side chains.
C. It has different carboxyl groups.
D. It has different amine groups.
Answer:
a. po tamang sagot
Explanation:
pa pafoolow po pleasr
The DNA and RNA are polynucleotides which contain a chain of nucleotides monomers with different nitrogenous bases. Each nucleotide different from the others, as It has different bases. The correct option is A.
What is a nucleotide?A nucleotide is defined as a compound containing three component units, namely a pentose sugar (either ribose or 2-deoxyribose), a heterocyclic nitrogenous base (a substituted purine or a substituted pyrimidine) and a phosphate group.
The nucleotides are the phosphate esters of nucleosides. A nucleotide containing ribose as the sugar unit is termed as the ribonucleotide. While one containing 2-deoxyribose as the sugar unit is termed as the deoxyribonucleotide.
The nitrogenous bases in RNA are adenine, guanine, cytosine and uracil whereas in DNA the bases are adenine, guanine, cytosine and thymine. The purines are adenine and guanine whereas cytosine, thymine and uracil are pyrimidines.
Thus the correct option is A.
To know more about nucleotide, visit;
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Help me :( plzzzz :(
Answer: 1.80
Explanation:
How many O2 molecules react with 47 CH4 molecules according to the preceding equation CH4 + O2 → CO2 + H2O
convert 300g into kg
Answer:
0.3kg
Explanation:
