Answer: Decomposition is the answer
Explanation: why because aluminium hydroxide would decomposes in the presence of heat and would form an oxide which is aluminium oxide and would also form water as a product.
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19. 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
Hydrogen gas (H2) is a promising alternative to fossil fuels. How many molecules are present in 1.0 kg of hydrogen gas
Answer:
3.01×10²⁶ molecules
Explanation:
From the question given above, the following data were obtained:
Mass of H₂ = 1 Kg
Number of molecules =?
From Avogadro's hypothesis,
1 mole of H₂ = 6.02×10²³ molecules
But 1 mole of H₂ = 2 × 1 = 2 g
Now, we shall determine the number of molecules present in 1 Kg (i.e 1000 g) of H₂ as follow:
From Avogadro's hypothesis,
2 g of H₂ = 6.02×10²³ molecules
Therefore,
1000 g of H₂ = 1000 × 6.02×10²³ / 2
1000 g of H₂ = 3.01×10²⁶ molecules
Thus, the number of molecules present in 1 Kg (i.e 1000 g) of H₂ is 3.01×10²⁶ molecules
which organ is used to detect the product of neutralisation reaction
Answer:
Neutralization reactions occur when two reactants, an acid and a base, combine to form the products salt and water.
The organ that is used to detect the product of a neutralization reaction is the sense of taste.
When a neutralization reaction occurs between an acid and a base, it results in the formation of a salt and water. The salt produced in the reaction may have a distinct taste, depending on its chemical properties. For example, when hydrochloric acid reacts with sodium hydroxide, the products are sodium chloride and water. Sodium chloride, commonly known as table salt, has a characteristic salty taste.
Similarly, other salts formed from neutralization reactions may have different tastes. For instance, magnesium hydroxide reacting with acetic acid produces magnesium acetate, which has a slightly sweet taste. By using our taste buds, particularly on the tongue, we can detect and identify the taste of the salt formed during a neutralization reaction.
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sodium is more reactive than magnesium. Give reason
Answer: According to the reactivity of metals Sodium is the second metal while Magneesium is the fourth metal. The metal in the top of the reactivity serise table are more reactive.
(The series obtained by the arrangement of metals in the decending oder of their reactivity is the REACTIVITY SERIES TABLE)
Explanation:
K
Na
Ca
Mg
Al
Zn
Fe
Sn
Pb
H
Cu
Hg
Ag
Pt
Au
Therefore Sodium is more reactive than Magnesium
Answer:
The alkaline-earth metals tend to lose two electrons to form M 2+ ions (Be2+, Mg2+, Ca2+, and so on). These metals are less reactive than the neighboring alkali metal. Magnesium is less active than sodium; calcium is less active than potassium; and so on. These metals become more active as we go down the column.
Could anyone provide me with a run down on Electrolysis?
Answer:
La electrólisis es un proceso físico por el que se descompone una sustancia en disolución a través de la corriente eléctrica. Para que la electrólisis sea posible es necesaria una fuente de alimentación continua, una disolución iónica y dos polos (ánodo y cátodo), que atraen hacia sí los iones de signo opuesto.
Can someone help me with this one :")
Answer:
i think is probably A
Explanation:
because at constant temperature, the product of the pressure and volume of a given mass of and ideal gass in a closed system is always constant
Answer:
I believe the answer is A or D
Explanation:
I hope this helps you out!
Which of the following is the best thermal insulator to reduce the transfer of
heat by convection?
A. Air
B. Water
C. Alcohol
D. A vacuum
Answer:
A
Explanation:
describe the formation of covalent bond in methane (5 marks)
Answer: Covalent bonding is when atoms of different elements share electrons
Explanation: Taking Methane CH₄
it contains Hydrogen and Carbon atoms pairing electrons. the electronic configuration for carbon is 2,4 that is to say it has 4 electrons in its valence shell (outer shell) and hydrogen has 1 so carbon shares its four electrons with four hydrogen atoms thus forming a covalent bond. so they now have a stable arrangement of electrons in their outer shell ,thus giving CH₄There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, sharing of electron is the only basis for the formation of covalent bond in methane.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Carbon has an electrical configuration of 2,4. Hydrogen only has one electron in its valence shell, whereas carbon contains four electrons. In order to create methane, carbon forms a covalent connection with four hydrogen atoms, sharing its four electrons with them.
Therefore, sharing of electron is the only basis for the formation of covalent bond in methane.
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Coupled reactions are: A. reactions in which endergonic reactions obtain the energy to go forward from exergonic reactions. B. reactions in which exergonic reactions obtain the energy to go forward from endergonic reactions. C. reactions that lower the activation energy of another reaction. D. any reactions that are accelerated by an enzyme.
Answer:
A
Explanation:
Coupled reactions are reactions in which endergonic reactions obtain the energy to go forward from exergonic reactions.
When benzene diazonium chloride interacts with phenol, the para position of the phenol molecules is associated with the diazonium salt, resulting in
p-hydroxyazobenzene. The coupling reaction is the name given to this process.
Which is producer gas? a) CO+H2 b) CO+N2 c) CO+ O2 d) CO+H20
Answer:
co + H2 it is the answer may it helpfull
Answer:
d
Explanation:
because CO mixes with H2O
Select all that apply Select the correct statements explaining how manometers measure the pressure of a gas in an experiment. Multiple select question.
In an open-end manometer, the gas pressure pushes on the Hg surface on one arm of the U tube and atmospheric pressure gas pushes on the other.
In an closed-end manometer, the gas pressure pushes on the Hg surface on one arm of the U tube and atmospheric pressure gas pushes on the other.
In an open-end manometer, the gas pressure is equal to the difference in column heights in the two arms of a U tube.
In an closed-end manometer, the gas pressure is equal to the difference in column heights in the two arms of a U tube.
The gas pressure is directly related to the height of a column of mercury it produces in a U tube.
Answer:
-In an closed-end manometer, the gas pressure is equal to the difference in column heights in the two arms of a U tube.
-In an open-end manometer, the gas pressure pushes on the Hg surface on one arm of the U tube and atmospheric pressure gas pushes on the other.
-The gas pressure is directly related to the height of a column of mercury it produces in a U tube.
Explanation:
Manometer is simply an instrument used for measuring the pressure that is acting on a column of liquid.
Now they could either be open ended or closed ended manometers.
However the difference between both of them is that;
Closed - end manometer are those used to measure absolute pressure while open end manometer is used to measure the gauge pressure.
From operation of a closed end manometer, the gas pressure is read from the difference in column heights of the two arms of the U tube being used. While in open end thermometer, the gas pressure will push the mercury surface on one arm of the U tube while the atmospheric pressure gas will push on the other arm.
Lastly, the height of a column of mercury in the U-tube is directly related to the gas pressure.
Thus, the correct options are A, D, E
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:
Which of the following statements regarding the movement of electrons during cellular respiration is true?
A. Electrons tend to move away from O2.
B. O2 is reduced when it accepts electrons and forms water.
C. The electrons release large amounts of energy each time they are transferred from one molecule to another.
D. O2 is eventually oxidized by the electrons to form water.
Answer:
B. O2 is reduced when it accepts electrons and forms water.
Explanation:
During cellular respiration water is formed when oxygen receives electrons and picks up protons at the conclusion of the electron transport chain. The electron transport chain will stop functioning if there isn't enough oxygen to receive electrons (for example, because a person isn't breathing in enough oxygen), and ATP will no longer be created by chemiosmosis. Cells can't carry out the reactions they need to function if they don't even have enough ATP, and they may perish after a long period of time.
When a gas is heated,
Answer: when gas is heated ,they gain more kinetic energy causing them to move faster.
Explanation: so as they gain kinetic energy they hit the walls of the container with more force thus causing pressure to increase
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Si 40 g de un compuesto C6H10O5 se disuelven en 500 g de agua, determine el punto de ebullición de esta solución. (Agua: temperatura de ebullición 100 °C y Ke = 0,52 °C/m)
The question is: If 40 g of a compound C6H10O5 are dissolved in 500 g of water, determine the boiling point of this solution. (Water: boiling temperature 100 ° C and Kb = 0.52 ° C / m).
Answer: The boiling point of given solution is [tex]100.256^{o}C[/tex].
Explanation:
Given: Mass of solute = 40 g
Mass of solvent = 500 g (1 g = 0.001 kg) = 0.5 kg
[tex]K_{b} = 0.52^{o}C/m[/tex]
Molality is the moles of solute present in kg of solvent.
Moles is the mass of substance divided by its molar mass. Hence, moles of [tex]C_{6}H_{10}O_{5}[/tex] (molar mass = 162.141 g/mol) is calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{40 g}{162.141 g/mol}\\= 0.246 mol[/tex]
Now, molality of the solution is calculated as follows.
[tex]Molality = \frac{molesof solute}{mass(in kg)}\\= \frac{0.246}{0.5 kg}\\= 0.492 m[/tex]
The boiling point is calculated as follows.
[tex]\Delta T_{b} = K_{b}m[/tex]
where,
m = molality
Substitute the values into above formula as follows.
[tex]\Delta T_{b} = K_{b}m\\= 0.52^{o}C/m \times 0.492 m\\= 0.256^{o}C[/tex]
As the boiling point of water is 100 degree Celsius. So, the boiling point of solution is as follows.
[tex](100 + 0.256)^{o}C\\= 100.256^{o}C[/tex]
Thus, we can conclude that the boiling point of given solution is [tex]100.256^{o}C[/tex].
True or false, The mass of an electron is equal to the mass of a neutron.
Answer:
False
Explanation:
No, the mass of an electron is not equal to the mass of a neutron. Mass of neutron is greater than the mass of an electron.
Hydrogen fluoride, HF exist as liquid at room temperature. Explain this phenomenon based on the formation of hydrogen bonds.
Explanation:
The hydrogen fluoride molecule is highly polar, in the liquid and gaseous phases, HF prone to formation hydrogen bonds. ... These hydrogen bonds are strong, their energy is 41.5 kj/mol.Hydrogen fluoride can be a liquid or gas at room temperature; it has a boiling point of 19.5 ºC. It is corrosive, colourless and has a very strong odour.The gaseous compound formed when dry fluorine gas reacts with dry Hydrogen, gas is called hydrogen fluoride. Hydrogen fluoride gas on condensation forms liquid hydrogen fluoride which is also referred to as anhydrous hydrogen fluoride or anhydrous hydrofluoric acidhope it helps
stay safe healthy and happy..This is the chemical formula for calcium phosphate:
Ca3PO42.
Calculate the mass percent of oxygen in calcium phosphate. Round your answer to the nearest percentage
Answer:
This is the chemical formula for calcium phosphate:
[tex]Ca_3(PO_4)_2[/tex].
Calculate the mass percent of oxygen in calcium phosphate. Round your answer to the nearest percentage
Explanation:
The molar mass of calcium phosphate is: 310.18g/mol.
In one mole of calcium phosphate there are 8 moles of oxygen atoms.
The atomic mass of oxygen in calcium phosphate is: 128.0 g
Hence, the mass % of oxygen in the given compound is:
[tex]mass% of Oxygen =\frac{mass of oxygen}{mass of calcium phosphate}*100\\&=\frac{128.0g}{310.18g} *100\\&=41.3[/tex]
Hence,mass%of oxygen is 41.3.
1 x 10^-3 m is the same as which of the following? Select all that apply.
a
10000 m
b
1/1000 m
c
1/0.1 m
d
0.001 m
e
100 m
Answer: b and d
Explanation:
1×10^-3=1×1/10³=1×1/1000=1/1000 so b is correct
1×10^-3=1/1000=0.001
so d is correct
(Please help)
1.what is the most common isotope for element x
2.calculate the average atomic mass for element x
Answer:
1. Isotope with mass number 39.
2. 39.02g/mol
Explanation:
1. The most common isotope is the isotope in the higher proportion, that is:
Isotope with mass number 39.
2. The average atomic mass is the sum of the masses times their abundance. For the element X:
Average atomic mass:
38*0.0967 + 39*0.7868 + 40*0.1134 + 41*0.0031
= 39.02g/mol
The specific shape that an electron moves in inside a sub-level_____
Answer:
The specific shape that an electron moves in inside a sub-level shell.
define all the physical features of earth
MOUNTAINS
Mountains are large, tall, and elevated land areas on the earth's surface. They have steep, sloping sides and sharp or rounded ridges, and a high point, called a peak.
PLAINS
Plains are one of the major landforms on earth. They are areas of flat lands.
PLATEAUS
A plateau is a flat, elevated landform that rises above the surrounding area.
DESERTS
Regions of dry, arid lands.
DELTAS
A river delta is a landform created by deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water.
7. Explain the difference between an ionic compound and a molecule, on an atomic
level (that is, describe what is happening with the atoms that makes these compounds
different)
Answer:
bakit Kay's lahat Ng module mahirap
ionisation potential of the element increases across a period from left to right
Answer:
False
Explanation:
It actually decreases.
Which of the following belongs to VIIA?
a) Na
b) Mg
c) Cl
d) Xe
the right answer and please Quick
Answer: The answer is CL also known as chlorine
What are characteristics of all protests?
Answer:
Explanation:
Una manifestación, protesta o marcha es la exhibición pública de la opinión de un grupo activista (económica, política o social), mediante una congregación en las calles, a menudo en un lugar o una fecha simbólicos y asociados con esa opinión.
What is a substance that decreases the rate of a chemical reaction called? (5 points)
What is a substance that decreases the rate of a chemical reaction called? (5 points)
Catalyst
Inhibitor
Product
Reactant
Answer:
inhibitor :)
Explanation:
Catalysts speed the reaction up, and the other 2 are essential for the reaction to work, so an inhibitor :)
Answer:
Inhibitor
Explanation:
classify each of the following solids as ionic,metallic, molecular, network (covalent)or amorphous?
1) Tetra phosphorous deicide(P4O10)
2)Graphite
3) Ammonium phosphate (NH4)3po4
4) Brass
5)SiC
6)Rb
7)l2
8)LiBr
9)P4
10) Plastic
11)Si
Answer;
P4O10 - molecular solid
Graphite - network solid
Ammonium phosphate - ionic
Brass - metallic
SiC - network solid
Rb- metallic
I2 - molecular
LiBr- ionic
P4 - molecular
Plastic - amorphous
Si - network
Explanation:
An ionic solid is consists of a combination of two oppositely charged ions to yield a crystal lattice such as LiBr.
A covalent solid is one in whom the atoms of the molecule are held together by covalent bonds e.g I2.
Metals are held together by interaction of metal ions and a sea of electrons. This is called the metallic bond. Like SiC
A network solid consists of covalently bonded atoms held together by strong covalent bonds and the molecules in the solid state are held together by a continuous network of atoms.
When a theory is disposed by further evidence, which of the following occurs
Answer:
it adds to scientific knowledge
what is the application of chemistry
Answer:
Chemistry plays an important and useful role towards the development and growth of a number of industries. This includes industries like glass, cement, paper, textile, leather, dye etc. We also see huge applications of chemistry in industries like paints, pigments, petroleum, sugar, plastics, Pharmaceuticals.