Answer:
Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions. ... Some of the examples of elements are Iron, Copper, Gold, etc. A few examples of compounds are NaOH, NaCl, etc.
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.
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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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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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
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
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.
A 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.
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'sHow 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
Hope this help!
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+
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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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.
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 square is more dense
Answer:
mass ,volume and density
a) Briefly discuss hydrolysis of sicl4
Answer:
Types of Hydrolysis
There are several types of hydrolysis, and we will look at them in brief below.
Salts: This is the most common type of hydrolysis. Hydrolysis of salts generally refers to the reaction of salt with water where it involves the interaction between cations or anions of salts and water. During hydrolysis, a salt breaks down to form ions, completely or partially depending upon the solubility factor.
Acid and Base: Acid–base-catalysed hydrolysis can be found during the hydrolysis of esters or amides. Here, the process of hydrolysis occurs when water or hydroxyl ion reacts with the carbon of the carbonyl group of the ester or amide where new compounds are formed. The products of both hydrolysis are compounds with carboxylic acid groups.
ATP: Most biochemical reactions that occur in living organisms are in the form of ATP hydrolysis which takes place with the help of enzymes acting as catalysts. The catalytic action of enzymes allows the hydrolysis or breaking down of proteins, lipids, oils, fats and carbohydrates.
Explanation:
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
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 ).
Hope that helped!
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:
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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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
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:
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
Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
bubble and foam!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
How does specific heat capacity affect heating rate
Answer:
The specific heat capacity affect heating rate by the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C).
Explanation:
Pls mark me as brainliestThe 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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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:
[tex].[/tex]
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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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.
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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Identify two ways to measure mass
Answer:
Putting it in water, and see the displacement of the water, or just measuring its weight and devide it by the gravitational pull