Explanation:
each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.
How can you improve your ability to see the indicator color change at the endpoint of a titration?.
Answer: Place a piece of white paper under the analyte flask throughout the titration
Explanation:
The end point of titration can be made easy by the use of indicators. But we have to be keenly observe for each drop from the burette because, the colour change will be sudden for a drop.
What is titration?Titration is an analytical technique used to determine the unknown concentration using a standard reagent of known concentration. The standard reagent of known concentration is called titrant and the one to be determined is called analyte.
Usually analyte is taken in a conical flask and titrant in a burette. The end point of titration is the point at which the reaction is completed in perfect stoichiometry.
In acid-base titrations, the indicators used having different colors in different pH. Hence, the indicator in the analyte will change in color when the acidity of the medium changes. We have to observe keenly for the color change because it happens for any drop.
The adding of titrant from the burette must be dropwise and thus we can get a time to notice the sudden colour change of indicator.
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Which of the following are required for plants to carry out photosynthesis?
Group of answer choices
soil
water
carbon dioxide
oxygen
sunlight
Answer:
Carbon dioxide, water, and sunlight
Explanation:
For a constant force, when the surface area is tripled the
.
— Pressure =
force
surface area
pressure is
(a) doubled.
(b) a third as much.
(c) tripled.
(d) unchanged.
I think it is c
because it say tripled
measuring the isotopic composition of atmospheric co2 shows that the burning of fossil fuels has led to _____ co2 levels over the last 200 years.
Answer:
measuring the isotopic composition of atmospheric co2 shows that the burning of fossil fuels has led to the co2 levels over the last 200 years.
Explanation:
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7. What is the name of the compound AICO3?
Answer:
Calcium carbonate
Explanation:
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What has more atoms, a mole of carbon or a mole of fluorine?
A mole of carbon
A mole of Florine
They have the same number of atoms
Answer:
They have the same number of atoms
Explanation:
The mole (symbol: mol) is the base unit of amount of substance.
Think of mole meaning like inch. An inch of grass is the same as an inch of a flower. Mole is the standard measuring unit of atoms.
A disadvantage of disposing of waste polymers through _____ is that they must first be separated, which can be expensive. What is the missing word in this sentence?
A disadvantage of disposing of waste polymers through recycling is that
they must first be separated.
Recycling is the process of forming new polymers and compounds as against their disposal .
Recycling involves separating the items into various sections such as paper,
plastic , metal etc. This is because they both undergo different recycling
processes.
The disadvantage of this process is that it's time consuming and also
expensive as a great amount of time and man power is needed to
separate the waste items.
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Why was einstein not happy with the probable positions of electrons in the orbitals?
Since electron orbitals are described as probability clouds, Einstein disagreement with the probable positions of electrons in the orbitals is that, It is not possible to know the orbit of an electron when the position is under probability.
According to Bohr's theory, it is difficult to locate electron or cannot be located in a definite region. Electron has to be found in an orbit and nowhere else. When the probability of finding an electron in a given spherical shell around the nucleus is plotted the distance of the electron from the nucleus for the hydrogen atom, the graph indicates that the probability of finding the electron increases as the distance between the electron and the nucleus decreases
Bohr claimed that electrons a entities had only probabilities if they weren't observed. While Einstein argued that they had independent reality.
But in wave mechanics Model, there is a slight chance of knowing the location of the electron.
Heisenberg uncertainty principle also claim the possibility of knowing the position of electron. Albert Einstein also claim that; to determine the position of an electron to an accurate extent, you would have to compromise your ability to know it's momentum. This inaccuracy will eventually affect the measurement of momentum which will be extremely uncertain.
Since electron orbitals are described as probability clouds, Einstein disagreement with the probable positions of electrons in the orbitals is that, It is not possible to know the orbit of an electron when the position is under probability.
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Can someone help me with this chemistry question?
Write the balanced chemical equation for the reaction
of solid carbon with oxygen gas to form carbon monoxide gas.
Answer:
2C +O2 - COExplanation:
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The balanced chemical equation for the reaction of solid carbon with oxygen gas to form carbon monoxide gas is 2 C + O₂[tex]\rightarrow[/tex] 2 CO.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Filling Air Bags Automobile air bags produce nitrogen gas from the reaction:
a. If 2.25 g of NaN3 reacts to fill an air bag, how much P–V work will the N2 do against an external pressure of 1.00 atm given that the density of nitrogen is 1.165 g/L at 20°C?
b. If the process releases 2.34 kJ of heat, what is ∆E for the system?
(a) The work done by the nitrogen against external pressure is 126.66 J.
(b) The change in the internal energy of the system is -2,466.66 J.
The given parameters:
Mass of the compound, = 2.25 gExternal pressure, P = 1.0 atm = 101325 PaDensity of Nitrogen gas, ρ = 1.165 g/LTemperature of the Nitrogen gas, T = 20⁰CThe molar mass of the given compound is calculated as follows;
NaN₃ = 23+ (14 x 3) = 65 g/mol
65 g -------------- 42
2.25 g ------------- ?
[tex]= \frac{2.25 \times 42}{65} \\\\= 1.45 \ g[/tex]
The volume of the nitrogen gas is calculated as follows;
[tex]\rho = \frac{m}{V} \\\\V = \frac{m}{\rho} \\\\V = \frac{1.45}{1.165} \\\\V = 1.25 \ L[/tex]
[tex]V = 0.00125 \ m^3[/tex]
The work done by the nitrogen against external pressure is calculated as follows;
[tex]W = PV\\\\W = 101325 \times 0.00125\\\\W = 126.66 \ J[/tex]
The change in the internal energy of the system is calculated by applying first law of thermodynamics as follows;
[tex]\Delta E = Q - W\\\\\Delta E = (-2,340) - (126.66)\\\\\Delta E = -2,466.66 \ J[/tex]
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I'm melting point of a substance is the blank which it melts
Answer:
hope its help
Explanation:
melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1
Answer:
I hope you have your correct answer
What three factors describe the
movement of surface water in streams and
rivers?
Three factors that describe the movement of surface water in streams and rivers are the river's gradient, flow, and stream load.
I hope this helps!
what is the coefficient for 4K2CO3
If an iron nail was placed in the copper sulfate solution, would you see a
change?
Explain your answer.
Answer:
Iron displaces copper ions
Explanation:
which means that iron in more reactive than copper.
(Fe2+) and cupric ion (Cu2 +) is converted into metallic copper. Fe (s) + Cu2 + (aq) —→ Fe2+ (aq) + Cu (s).
how does the ribosome know the sequence of amino acids
Answer:
The ribosome contains three grooves which are sites for the tRNA. The first codon is AUG, which is called a "start codon". ... So, the tRNA that has the anti-codon sequence of UAC carrying the amino acid Met bonds to the mRNA codon. Another tRNA bonds to the next codon in the next groove with the next amino acid
Batteries allow us to store energy for when it’s needed, such as starting a car engine or jump-starting another car whose battery has lost its charge. But batteries cannot operate without chemical reactions. What kind of energy do you think is stored in the substances within the battery?
Answer:
Chemical energy
Explanation:
I hope this helped you!
Batteries store the energy in the form of chemical energy that chemical energy is converted into electrical energy. Chemical energy is used to stored in the substances within battery.
What is electrochemical energy ?The conversion of chemical energy into electrical energy or vice versa is called as electrochemical energy . This includes reactions transferring electrons, redox reactions .
Redox reaction in which reduction and oxidation takes place simultaneously. Reduction, when a substance receives one electron. Oxidation when a substance gives away one electron.
A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit.
Thus, chemical energy is used to store in the substance within battery.
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C2H4NH Lewis structure
Here’s the second part to my science
Answer:
"powerhouse"- mitochondria
"stores spare parts"- vacuole
"surrounds the nucleus"- nuclear membrane
"controls the cell"- nucleus
"pathways"- endoplasmic reticulum
"inner layer"- cell membrane
"outer plant covering"- cell wall
"fills up the cell"- ctyoplasm
"collects light"- chloroplasts
"packages proteins"- golgi
"holds info"-chromosomes
"makes protein"-ribosomes
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If 5.3 g of gallium reactions with 5.3 g of oxygen according to the following reaction, how many grams of gallium oxide can be produced?
Word equation:
Formula equation:
(Must be balanced!)
Answer:
can you help mine please
How many molecules of chlorine are needed to react with 56.Og of iron to form Iron (III) chloride (FeCl3)?
which of the following statements about this reaction is true:
CH4+2O2-->CO2+2H2O+Heat
A. The reaction releases heat.
B. heat is absorbed by the reaction.
C. the reaction consumes water.
D.The reaction releases oxygen.
Explanation:?
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The Correct statement is ~
A. The reaction releases heatAs we can observe, there's heat in product side of the given equation that shows - In the given reaction heat is released making it an exothermic reaction ~
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[tex]\mathrm{✌TeeNForeveR✌}[/tex]
The dissolved materials in seawater are thought to originate from chemical weathering of rocks on the continents and also from ________.
Answer:
outgassing of elements from earth's interior
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If I am calculating the volume in pv=nrt
Then, how do I know what units it is in coz normally it would be m3 but how do I know that it's not dm3
Explanation:
If you use the SI units for P, n, R and T ( In Pa, mol, JK-1mol-1 and K respectively) you'll end up with a Volume with m3 units. So if you have others in different units first convert them into the units I mentioned above and you will definitely get the answer in m3.
What is the chemical name of NaCl₂
Answer:
It’s sodium chloride
Explanation:
Hope that helps
The body also loses heat by the evaporation of sweat. How is a tea kettle boiling similar to the evaporation of sweat from the body?
Answer:
Our body loses heat by the evaporation of sweat, which is like a tea kettle boiling on a stove top. Both are being heated through conduction, the tea kettle from the stove top and the sweat from our body.
Explanation:
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Why doesn’t one-electron transfer from a hydrogen atom to another hydrogen atom?
Answer:
The electrons start to repel each other.
Explanation:
Most atoms attain a lower potential energy when they are bonded to other atoms than when they are separated. One is that the single electrons that each hydrogen atom possesses begin to repel each other. This repulsive force would tend to make the potential energy of the system increase.
Earth’s spheres interact in a system that makes up all of the matter, energy, and processes within Earth’s boundary. You learned about the different spheres in this lesson and how spheres are not isolated, but they interact. In the space below, explain how the biosphere relies on the other spheres for survival.
Answer:
Explanatthe tryposphereion:
tornadoes form when updrafts from thunderstorms begin to _____
First answer that is correct gets brainly
Tornadoes form when updrafts from thunderstorms begin to interact with strong wind shear and develop a rotating column of air.
Updrafts are powerful vertical currents of air that occur within thunderstorms, caused by the rapid heating of the Earth's surface and the subsequent convective process. These updrafts carry warm, moist air upward, creating a conducive environment for the formation of severe weather phenomena.
When the updrafts encounter wind shear, which is the change in wind speed and direction with height, it can lead to the development of horizontal vorticity. Wind shear creates a rotating motion within the storm, where air at different heights starts to rotate at different speeds, generating a horizontal spin.
As the updraft continues to intensify, it tilts the rotating column of air from horizontal to vertical, forming a mesocyclone. The mesocyclone is a critical component in tornado formation. It acts as a localized area of strong rotation within the storm, extending from the cloud base to the mid-levels of the atmosphere.
Under specific conditions, such as the presence of a strong updraft, a well-developed mesocyclone, and further enhancement from other atmospheric factors, the mesocyclone can contract and intensify into a tornado. The process is complex and influenced by various meteorological factors, but the interaction between updrafts, wind shear, and the development of rotation plays a fundamental role in tornado formation.
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What is an element? Arrow
Answer:
One arrow is positioned in each box according to Hund's Rule which tells us to maximise the number of unpaired electrons in orbitals of the same subshell, and, to give those electrons the same "spin" (parallel spin).
Explanation: