Answer:
a physical change only changes the look of something whereas a chemical change occurs when one thing has a reaction and it forms a new substance.
How does convection affect the earths atmosphere
Answer:
I think the layers of the atmosphere does temperature increase with increasing height. It is affected by convection because it heats the lower atmosphere. It is affected by conduction because the is the transfer of thermal energy. I guess
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Which of these outcomes is conclusive evidence that mixing sugar in water is a physical change?
Answer:
» Water changes from colorless to a pale colored solution.
» The solubility of water reduces because a saturated solution is formed.
» The freezing point of water decreases. [colligative property]
» The boiling point of water elevates [colligative property]
» The vapour pressure of water lowers [colligative property]
Explanation:
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Filtration is the most appropriate method for separating a solution of water and which substance?
A. alcohol
B. salt
C. sand
D. sugar
Answer:
Sand
Explanation:
If you get salt or sugar in your water, you have to legit desalinate it to get the water and item out. You need to evaporate the water by increasing temperature and then lower temperature to separate the substances.
If you have alcohol, you need to distill it by trapping it and stuff.
With sand, the molecules are much larger which lets you separate the substances easily.
For example, on a beach, you can slap a handful of sand in your pail, but the sand sinks to the bottom right? You can just pour out the water.
Loss of atmospheric ozone has led to an ozone "hole" over Antarctica. The process occurs in part by three consecutive reactions. (Each of the reactants and products in these reactions are gases.)
(1) Chlorine atoms react with ozone (O3) to form chlorine monoxide and molecular oxygen.
(2) Chlorine monoxide forms ClOOCl.
(3) ClOOCl absorbs sunlight and breaks into chlorine atoms and molecular oxygen. If the coefficient for a particular substance is "1", do not write the "1" in the balanced equation. For example, instead of writing "1Cl(g)", simply write "Cl(g)".
(a) Write a balanced equation for each step, including the state of each molecule.
(b) Write an overall balanced equation for the sequence.
Ozone O₃ consists of a strong reactive gas made up of three atoms of oxygen. Ozone occurs on the Earth as natural and man-made gas.
Ozone impacts life on Earth in positive or harmful ways depending upon its location in the atmosphere.
From the information given, we are to balance the reactant and the product that leads to the formation of Ozone by following each step.
Step 1:
2Cl° + 2O₃ 2ClO° + 2O₂
Chlorine molecular
monooxide oxygen
Step 2:
2ClO° ClOOCl
Step 3:
ClOOCl + sunlight → 2Cl° + O₂
(b)
The Overall balanced equation can be expressed as:
2O₃ → 3O₂
Therefore, from the above explanation we can see the step by step process for the balanced equation and the overall balanced equation.
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The volume of real gas will change if “P” increases upto 500 atm and temperature decrease upto 0°C A. Volume increases by 0.05% B. Volume decreases by 0.05% C. Volume increases 20% D. Vol decreases 20%
We have that The volume of real gas will change if “P” increases upto 500 atm and temperature decrease upto 0°C there will be
. Volume decreases by 0.05%
OPtion B
From the question we are told that
if “P” increases upto 500 atm
temperature decrease upto 0°C
Generally the equation for the ideal gas equation is mathematically given as
P=\frac{nRT}{V}
Where
n=1
R=0.08
Therefore
The volume is directly proportional to temperature
Therefore
. Volume decreases by 0.05%
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HURRY PLEASE!! A student builds a model of a town. The model's scale in 1:48. Fill in the missing
information in the table.
Distance between
in real life
in model
School and library
18.0 m
0375m 0
Grocery store and city hall
Select
14
26 m
Post office and park
9.6 m
30 m
MIT
864 m
An object measures 6.2 cm×13.7 cm×26.9 cm. Which value is the length of the object?
Answer: 6.2cm
Explanation: because don’t forget it’s
Length • Width • Height
6. The overall process of photosynthesis has the balanced chemical equation 6CO2 +
6H2O → C6H12O6 + 602. What does this tell you about the relative amounts of carbon
dioxide and water consumed in this process?
ОООО
A. For every mole of carbon dioxide consumed, one mole of water is consumed.
B. For every six moles of carbon dioxide consumed, one mole of water is consumed.
C. For every six grams of carbon dioxide consumed, one gram of water is consumed.
D. For every gram of carbon dioxide consumed, one gram of water is consumed.
Answer:
The right answer is option A
The percent by mass of nitrogen for a compound is found to be 46.7% Which of the following could be this species?
The percent by mass of an element in a compound is obtained as the ratio of the mass of the atom to the relative molecular mass of the compound multiplied by 100.
If we look at the representations shown in the image, we will notice that the red ball symbolizes the oxygen atom while the blue ball symbolizes the nitrogen atom.
The percent by mass of nitrogen in NO is 46.7%. This is obtained as follows;
Molar mass = 14 + 16 = 30
percent by mass of nitrogen = 14/30 * 100 = 46.7%
NO is the diagram that has only one red and blue ball respectively.
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What is the MAIN ingredient in smokeless gunpowder
Answer:
Spherical smokeless powder is generally made from nitrocellulose as the base material. The nitrocellulose may be derived from purified cellulose, such as from cotton linters or wood, which is then nitrated by being treated with nitric and sulfuric acids (Olsen 1942. Smokeless powder.
Explanation:
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Outline the steps involved in the synthesis of 4-bromo-3-nitro-phenol from 4-bromobenzoic acid.
Answer:
[tex]4 - bromobenzoic \: acid \\ ↓ \\ { \tt{ \{soda \: lime \: and \: calcium \: oxide}} \\ { \tt{and \: heat \}}} \\ ↓ \\ 4 - bromobenzene \\ ↓ \\ { \tt{ \{chlorine \: and \: aluminium \: chloride \}}} \\ ↓ \\ 4 - bromo - 2 - chlorobenzene \\ ↓ \\ { \tt{ \{water \: and \: sodium \: hydroxide \}}} \\ ↓ \\ 4 - bromophenol \\ ↓ \\ { \tt{ \{conc.nitric \: acid \: at \: 60 \degree c}} \\ { \tt{and \: sulphuric \: acid \}}} \\ ↓ \\ 4 - bromo - 3 - nitrophenol[/tex]
In brackets, are the reagents
Which of the following statements is incorrect for the reaction of 1,3- butadiene with a substituted alkene CH2=CHX when X is a nitro group?
Answer:
hugsvsbsbbsnjsjsnsbsbbzbd
which square is more dense
Answer:
mass ,volume and density
The chemical reaction represented as “AB ⇒ A + B” is a ______
Answer:
Below
Explanation:
This would be a decomposition reaction. This occurs when a compound breaks down into 2 + simpler substances. We can see this from AB --> A + B, one compound (AB) breaks down into 2 simple substances ( A and B ).
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You got out to dinner and the bills comes to $44.79. How much should you tip if you want the tip to be 18.0% of the bill?
Answer:
7%
Explanation:
I'd you have $44.79 you put the decimal next to the first 4 so 10% would be $4 and 20% would be $8 so 18% will be like 7
how can you use terms such as thermal energy, particles, motion, and flow to explain the movement of heat in our world
Answer: Thermal energy is the kinetic energy of particles and heat is the term used to describe how this energy may flow to other systems, such as in a radiator.
Explanation: Molecules have a level of kinetic energy that can be measured by temperature. Higher temperatures result in more rapid and frequent collisons of particles in motion. Heat is the term used to measure the quantity of vibration energy in a given system. The SI unit for heat energy is the Joule. The water molecules in a pot of boiling water have a kinetic energy sufficient for them to break away from other water molecules and become gaseous (boiling point). The heat energy in 1 liter of water at 95C can be calculated in terms of Joules/liter, based on the specific heat of water (e.g., in units of J/gC). This heat can flow to other systems. A home boiler heater unit heats water tha can be pumped around the house ehre it will flow from radiators into thje surrounding air.
Heat is the word used to explain how this energy may transfer to other systems, such as in a radiator, and thermal energy is the kinetic energy of particles.
What is thermal energy?
By virtue of its temperature, a system in a condition of thermodynamic equilibrium has thermal energy or internal energy. Unlike the energy of systems that are not in a state of thermodynamic equilibrium, thermal energy cannot be transformed into meaningful work as quickly.
For instance, the same fluid or solid in a thermodynamic equilibrium state with the same energy (as thermal energy) cannot do work unless it is combined with another substance at a different temperature, as in a heat engine. However, the same fluid or solid in a moving state with the same energy (as mechanical energy) can be converted to work in some mechanical device, such as a windmill or a waterwheel.
Therefore, heat is the word used to explain how this energy may transfer to other systems, such as in a radiator, and thermal energy is the kinetic energy of particles.
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Is Calcium, Ca a metal or a non-metal? Explain your thinking.
Answer:
Calcium is a metal, particularly,an alkali earth metal
Explanation:
It donates two electrons to form cation
Ca+2e––>Ca^2+
Which of the following is a true statement?
Periods form horizontal rows, groups form vertical columns Periods form horizontal rows, groups form vertical columns Gases form horizontal rows, categories form vertical columns Gases form horizontal rows, categories form vertical columns Groups form horizontal rows, periods form vertical columns Groups form horizontal rows, periods form vertical columns categories form horizontal rows, gases from vertical columns
Answer:
The correct answer is A.
The horizontal rows on the periodic table are called periods, while the vertical columns are called groups.
hope this hepl'sA biochemist carefully measures the molarity of glucose in of cell growth medium to be . Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to . Calculate the new molarity of glucose in the cell growth medium. Round each of your answers to significant digits.
In your own words, summarize the contrasting arguments of Democritus and Aristotle about the composition (make up) of matter.
Answer:
Aristotle disagreed with Democritus and offered his own idea of the composition of matter. According to Aristotle, everything was composed of four elements: earth, air, fire, and water. The theory of Democritus explained things better, but Aristotle was more influential, so his ideas prevailed.
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Which of the following compounds has the lowest percent gold content by mass which one has the highest percent gold content by weight?
a. AuOH
b. Au(OH)3
c. AuCI3
d. AuI3
Answer:D. AuI3
Explanation:
How many molecules of each of the cofactors are produced when two acetyl-SCoA molecules pass through the citric acid cycle?
Answer:
Explanation:
1000
Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
bubble and foam!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which of the following alcohols will give a positive chromic acid test?
(A) tert-butanol (B) cyclohexanol (C) pentan-3-ol
(D) both A and B (E) both B and C
(E) Both B and C
What is chromic acid test?
The chromic acid test uses the Jones reactant to oxidize aldehydes and alcohols and reduce the chromic acid, resulting in a color change.Positive chromic acid test is indicated by disappearance of orange color from chromic ions and appearance of blue-green color from Chromium (III) ion (reduction of chromium ion from [tex]CrO_4^- \text{to } Cr^{3+}[/tex])Positive chromic test indicated functional groups that can be oxidized.
⇒Cyclohexanol can be oxidized to become cyclohexanone.
⇒Pentan-3-ol can be oxidized to become pentan-3-one.
Hence, both B and C will show positive chromic acid test.
A) tert-butanol although contains alcohol functional group, cannot be further oxidized as it is a tertiary alcohol.
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What is cylopasm?
A. The center of control for a cell.
B. The organelle that create protein for a cell.
C. The membrane that surrounds a cell.
D. The substance that holds the organelle of a cell in place.
Answer:
D. The substance that holds the organelle of a cell in place.
Explanation:
Cytoplasm is the material filled within the cell, and it holds the organelles in a cell in place.
Describe the differences between models and scientific laws and theories. (
Answer:
Scientific laws and theories have different jobs to do. A scientific law predicts the results of certain initial conditions. ... In simplest terms, a law predicts what happens while a theory proposes why. A theory will never grow up into a law, though the development of one often triggers progress on
Explanation:
Which method is used to separate the following mixture (a) water + kerosene
Answer:
The separation of kerosene, oil, and water are immiscible liquids, so they can be separated funnel.
Please help thank you
Answer:
be pulled into the new star
Explanation:
Because it is heavier, with more mass and more gravitational force than our little Sun.
Find the final pressure of a gas at 150. K, if the pressure of the gas is 210. kPa at 120. K.
Answer:
final pressure = 262.5kpa
Explanation:
using Gay-Lussac's Equation
P1/T1 = P2/T2
P1 = 210kpa = 210000pa
T1 = 120k
P2 = ?
T2 = 150k
210000/120 = P2/150
1750 = P2/150
P2 = 1750 X 150
P2 = 262500pa
P2 = 262.5kpa
The ionic radius of a sodium ion is 2.27 angstroms (A) . What is this length in um
[tex]\boxed{\sf 1Å=10^{-10}m}[/tex]
[tex]\\ \rm\longmapsto 2.27Å[/tex]
[tex]\\ \rm\longmapsto 2.27\times 10^{-10}m[/tex]
[tex]\\ \rm\longmapsto 0.227\times 10^{-9}m[/tex]
[tex]\\ \rm\longmapsto 0.0227\times 10^{-8}m[/tex]
[tex]\\ \rm\longmapsto 0.00227\times 10^{-7}m[/tex]
[tex]\\ \rm\longmapsto 0.00023\times 10^{-6}m[/tex]
[tex]\\ \rm\longmapsto 0.00023\mu m[/tex]
Therefore, length = 2.27 × [tex]10^{-4}[/tex] um
Ionic radius of sodium = 2.27 angstrons
1 angstron = [tex]10^{-10} m[/tex]
1 m =[tex] 10^6[/tex] micrometer (um)
So, 1 angstron = [tex]10^{-10} m\times10^6 um/m = 10^{-4} um[/tex]
Hence,
2.27 anstrons × [tex]10^{-4}[/tex] um/angstron =
2.27 ×[tex] 10^{-4} [/tex]um
So, length = 2.27 × [tex]10^{-4}[/tex] um
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