Answer:
Both are chemical changes because new substances are formed.
Explanation:
in both examples new substances are formed, meaning it is a chemical chang. It cannot be a physical change since it doesn’t involve a chnage in its shape, volume, length, or mass
To solve this, we must know each and every concept behind chemical change and physical change. Therefore, thee correct option is option A that is both are chemical changes because new substances are formed.
What is chemical change?
Chemical change is a reaction in which forming and breaking of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same.
A physical change is characterized by a differences in physical attributes. Melting, transformation to a gas, changes in strength, change in durability, changes in crystal structure, texturing change, shape, color, volume, and density are all examples of physical qualities. Tempering steel to make a knife blade is an instance of a physical change.
One famous example of chemical change is iron rusting. The arrangements , odor and colour of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature. Ripening of banana is also a chemical change.
Therefore, thee correct option is option A that is both are chemical changes because new substances are formed.
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What is the use of the set-up in the lab?
Answer:
Laboratory equipment is generally used to either perform an experiment or to take measurements and gather data. Larger or more sophisticated equipment is generally called a scientific instrument.
what are consumers? what kind of animals are they.
Answer:
There are four types of consumers: omnivores, carnivores, herbivores and decomposers. Herbivores are living things that only eat plants to get the food and energy they need. Animals like whales, elephants, cows, pigs, rabbits, and horses are herbivores. Carnivores are living things that only eat meat.
Explanation:
3. Iron (III) oxide reacts with magnesium to produce magnesium oxide and iron. If 0.25
moles of magnesium are consumed, what mass of iron will be produced?
[tex]\\ \rm\longmapsto Fe_2O_3+3Mg\longrightarrow 3MgO+2Fe[/tex]
3 moles of Mg produces ,2 mol FE1mol of Mg produces 2/3=0.6mol Fe0.25mol will produce
0.25(0.6)=0.15molMass of Fe
0.15(56)=8.4g13 of 120
10 83%
The total mass of the reactants is
equal to the total mass of
products. This is known as the
conservation of what?
Enter your answer
This is known as the law of conservation of mass.
conservation of mass
25 mL of 0.1 M lactic acid (CH, CH(OH)COOH) is titrated with 0.1 M sodium hydroxide (NaOH). The titration curve is shown. What is the approximate pKa? At the pKa, what fraction of the carboxyl group will have been converted to COO-? Express your answer as a decimal, not a percent.
The pKa and the fraction of the carboxyl group is mathematically given as
a) pH= 3.2
b) 1/2 Carboxyl group will give COO_
The carboxyl group and pKaQuestion Parameters:
25 mL of 0.1 M lactic acid (CH, CH(OH)COOH) is titrated with 0.1 M sodium hydroxide (NaOH).
Generally the equation for the pH is mathematically given as
ph = pka + log [tex]\frac{[sodium lactate]}{[lactic acid]}[/tex]
Therefore
NaOH moles = 1/2 moles of acid then [sodium lactate]
Means
NaOH moles =[lactic acid]
Therefore
pH=pKa
Hence
Volume of NaOH = 12.5 ml
Therefore
pH = pka
pH= 3.2
b)
Generally at pKa =3.2, The 1/2 Carboxyl group will give COO_
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In the above equation how many moles of N2 can be made when 91 moles of CuO are
consumed?
Please help
a kettle takes 3 minutes to boil. Calculate what part of an hour it is.
Answer:
1/20
Explanation:
an hour is 60 minutes and its 3 minutes of an hour therefore its 3/60 hour or 1/20 of an hour
Answer:
soln,
=3×60
=180 answer
solve this questions please
Answer:
I think B is the right answer.
hope this answer will help you
Why does atomic radius generally increase down a group on the periodic table?.
Answer:
It becuase it normally does that and normally down the groups number of energy level increases so there a bigger and greater radius
Explanation:
If I have 5.2 moles of gas at a pressure of 1.9 atm and at a temperature of 46 °C, what is the volume of the
container that the gas is in?
Answer:T=200k
Explanation: the answer is 200k
Select the correct structure that corresponds to the name.
Answer: a
Explanation:
The correct option is A.
What is n-Propylbenzene used for?n-Propylbenzene is used to prepare benzoic acid. It is employed as a solvent for gas chromatography. It is also used as a solvent and an intermediate in organic synthesis.
How is propylbenzene formed?n-Propylbenzene is formed inside H-ZSM-11 channels by intermolecular SN2 trans-alkylation between cumene and benzene.
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Please hurry
Which parts of Earth contain at least one form of water? Select all that apply. O
A. Cryosphere
B. Biosphere
C. Geosphere
D. Atmosphere
E. Hydrosphere
The parts of Earth that contain at least one form of water are Cryosphere, Biosphere, Geosphere, atmosphere and Hydrosphere. i.e all the given options are applicable.
All the parts of the earth contains at least one form of water and the hydrosphere on earth contains all form of water.
The atmosphere is the gaseous envelope round the earth. Breathing involves gaseous exchange between lungs and the atmosphere.
The biosphere is the living component. It is the part dominated and domiciled by life. T
The geosphere is the rock sphere of the earth. The earth's interior is all about the geosphere.
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50 POINTS AND BRAINLIEST
PLEASE HELP
Answer the questions using complete sentences.
1.What is the difference in electron movement between ionic and covalent bonding?
2.How can you predict if a bond would be ionic or covalent based on the location of the elements on the periodic table?
3.How could you predict if a bond would be ionic or covalent based on electronegativity?
4.What has to happen in order for bonds to break in reactants?
5.How does the height of an object affect the amount of gravitational potential energy it has?
6.What is kinetic energy?
7.What is the connection between kinetic energy and temperature? If the temperature goes up, what happens to the KE?
Answer/Explanation:
[1] The difference in electron movement between ionic and covalent bonding is ionic bond essentially donates an electron to the other atom participating in the bond, while electrons in a covalent bond are shared equally between the atoms.
[2] One way you can predict if a bond would be ionic or covalent based on the location of the elements on the periodic table is to look how far apart the two atoms forming the bonds are in the periodic table. If one atom is on the far left (Group 1 or 2) and the other is on the far right (Group 5, 6, or 7), then the atoms will have large differences in EN and will form an ionic bond.
[3] You can predict if a bond would be ionic or covalent based on electronegativity is If the electronegativity difference is less than 0.5, then the bond is nonpolar covalent. If the ΔEN is between 1.6 and 2.0 and if a metal is involved, then the bond is considered ionic. If only nonmetals are involved, the bond is considered polar covalent.
[4] In Order for bonds to break in reactants Molecules must collide in order to react. In order to effectively initiate a reaction, collisions must be sufficiently energetic (kinetic energy) to break chemical bonds.
[5] The height of an object affect the amount of gravitational potential energy it has by gravitational potential energy (P.E) depends on the mass of the body and the height at which it travels, the two quantities will therefore dictate the work done on the object which is eventually the same as magnitude of the gravitational potential energy P.E. It is assumed that gravitational pull acts toward the earth surface. The more the object move upward the more the work is done on the object to pull it down. We can have different masses of object at different heights, but gravitational field strength will always remain constant on earth.Since the gravitational potential energy P.E depend on the mass of the body and the height at which it travels, the two quantities will therefore dictate the work done on the object which is eventually the same as magnitude of the gravitational potential energy P.E.
[6] Kinetic energy is a form of energy that an object or a particle has by reason of its motion.Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.
[7] The connection between kinetic energy and temperature is the relationship between temperature and kinetic energy is that the higher the temperature, the more kinetic energy there is. As the temperature increases, the average kinetic energy increases as does the velocity of the gas particles hitting the walls of the container.
[RevyBreeze]
3. What is the volume of a 2 M solution of CaCl2, contains 15 grams of CaCl2?
V = n : M
Mr CaCl₂ : 111 g/mol
n = mole = mass : Mr
V = 15 g/111 g/mol : 2 M
V = 0.068 L
Are the following equations balanced or unbalanced?
Answer:
a is unbalanced and bcd is balanced
Valence electrons are found on the ____ shell of an atom and ____ with other atoms. For most atoms, the magic number is __ electrons to make a compound stable. Elements in group 1 have ___ valences electron(s) and are most ____. Elements in group 18 have 8 valence electrons, making them “___” and not reactive.
A)ants
B)sun
C)soil
D)air
Please help
Answer:
Abiotic factor would be soil.
Biotic factor would be ants.
Explanation:
How many grams of nitrogen trihydride would be produced if 9 moles of
hydrogen were used with excess nitrogen?
Reaction:
N₂ (g) + 3 H₂ (g) ---> 2 NH₃ (g)
mol NH₃ = H₂ (limited reactant) :
[tex]\tt \dfrac{2}{3}\times 9=6~moles[/tex]
grams: mol x Mr NH₃ (17 g/mol):
[tex]\tt = 6\times 17=102~g[/tex]
SOMEONE HELP ME PLEASE
Answer:
Convert the 60 and round it up with how ever many bars are above the 60
sorry if this doesnt help
Explanation:
Which equation correctly describes photosynthesis? Question 5 options: water sugar oxygen → carbon dioxide chlorophyll sunlight water carbon dioxide → oxygen sugar sunlight sugar → water oxygen carbon dioxide oxygen → water sugar sunlight.
Photosynthesis is a process of food and energy production by autotrophs. Water and carbon dioxide in the presence of sunlight gives oxygen and sugar.
What are the reactants and the products of photosynthesis?Photosynthesis is a biochemical reaction that uses organic and inorganic compounds and converts the molecules with the help of biological organs and substances.
The reactant of the process includes atmospheric water vapours, carbon dioxide and the heat and energy from the sun. These reactants are used by plants and some other organisms.
The organism utilizes the reactants and produces molecules of sugar like glucose and by-product oxygen. These molecules are necessary for the metabolic and respiratory processes.
Therefore, option B. [tex]\rm sunlight + water + carbon\; dioxide \rightarrow oxygen + sugar[/tex] is the correct equation that describes photosynthesis.
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PLEASE HELP!! FAST!!
Explanation:mok in this we learning about sum multiplication on a chart but it to small but the answer 52
Organism typically have more than one form of each gene if one form can mask the appearance of another form that form is considered what
Dominant
Explanation:
Meaning that particular gene is stronger than the others.
What is TRUE about mitochondrial DNA?
A.
It is inherited from the biological father.
B.
It is inherited from the biological mother.
C.
It is found inside the nucleus of a cell.
D.
It is harder to collect than nuclear DNA.
Answer:
The answer is B
Answer: B
Explanation:
1. Choose the correct answer from the given alternative. 1. A blood sample analysis showed that a total of 0.0000036g lead. Express it in micrograms? A. 0.0036 micro gram B. 0.036 micro grams C. 0.36 micro grams D. 3.6 micrograms.
Answer:
3.6 micrograms answers (c)
Explanation:
For the cell notation shown, which species is undergoing reduction?
For the cell notation shown, [tex]Ag(s)[/tex] is the species that is undergoing reduction.
What is reduction?Reduction can be defined as a chemical reaction or phenomenon through which the number of electrons or oxidation states associated with the atoms of a chemical element are changed.
This ultimately implies that, reduction is a half-reaction that typically involves decreasing the oxidation number of a chemical species, especially by gaining electrons.
In this scenario, [tex]Ag(s)[/tex] is the species that is undergoing reduction because it is not oxidized and it gains one (1) electron.
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Ag(s)
As here Ag gains one more electron from Ag^+1 so it undergoes reduction
Reduction simply means addition of hydrogen and gain of electronBalance the chemical equation : CH₄ + O₂ → CO₂ + H₂O
Answer:
balanced equation: CH₄ + 2O₂ → CO₂ + 2H₂O
Explanation:
Given sample: CH₄ + O₂ → CO₂ + H₂O
The carbon is same, so no need to change. Hydrogen 2 less on left side so putted "2" before H₂O = "2H₂O"so now, there is total 4 oxygen on left side to balance put 2 before right side oxygen like this "2O₂"changes applied: CH₄ + 2O₂ → CO₂ + 2H₂O
Which state of matter is characterized by having an indefinite shape, but a definite volume?.
Answer:
A liquid
Explanation:
Liquids has an indefinite shape, which means it could change from one shape to another. For example, if you pour water into a rectangular fish tank. The shape of the liquid changes into a rectangle. Definite volume means its volume is consistent and that it is unchangeable. If you fill the rectangular fish tank with water, the volume of the water stays the same even though it changes shape.
Hope this helps.
how many particles are in 2.0 moles of CH4
Answer: There are 4.8 x 1024 hydrogen atoms in 2.0 moles of CH4
Answer:
There are 4.8 x 1024 hydrogen atoms in 2.0 moles of CH4 .
Explanation:
The addictive chemical found in all tobacco products is.
Answer:
Nicotene
Explanation:
Stoichiometry Review Worksheet
1
Solid tin reacts with diatomic chlorine to produce tin (IV) chloride. If 95 grams of tir
react in an excess of chlorine, what mass of tin (IV) chloride is produced?
[tex]\\ \rm\longmapsto Sn+2Cl_2\longrightarrow SnCl_4[/tex]
Moles of Tin:-
95/118=0.8molHere
1 mol of Tin produces 1 mol Tin chlorideSo 0.8 mol will produce 0.8mol Tin chlorideMass of Tin chloride
[tex]\\ \rm\longmapsto 0.8(189)=151.2g[/tex]