Answer: Matter cannot be created or destroyed in chemical reactions.
Explanation: This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
cân bằng phương trình Al + HCl → AlCl3 + H2
Answer:
Explanation:
Balance the reaction of Al + HCl = AlCl3 + H2 using this chemical equation balancer!
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on an energy diagram, where is a stable equilibrium point?
Answer:
1.2
Explanation:
What are the three principles of Kinetic Molecular Theory
Answer:
The simplest kinetic model is based on the assumptions that: (1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size; (2) the molecules undergo perfectly elastic collisions (no energy loss) with each other and with the
Explanation:
How to determine the speed of light.
Please, if you wish not to receive multiple notifications, ignore answering this, for which you will be stressed and annoyed.
Answer:
Hey mate....
Explanation:
This is ur answer....
By adjusting the path length while observing the interference pattern and carefully measuring the change in path length, the wavelength of the light (λ) can be determined. The speed of light is then calculated using the equation c = λf.
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15.24. Calcium hydroxide, also known as slaked lime, is used in industrial processes in which low concentrations of base are required. Only 0.16 g of Ca(OH)2 dissolves in 100 mL of water at 25°C. What is the concentration of hydroxide ions in 250 mL of a solution containing the maximum amount of dissolved calcium hydroxide?
The concentration of the hydroxide ions, OH¯ in 250 mL of the solution containing the maximum amount of dissolved calcium hydroxide is 0.01728 M
We'll begin by calculating the number of mole of in 0.16 g of Ca(OH)₂. This can be obtained as follow:
Mass of Ca(OH)₂ = 0.16 g
Molar mass of Ca(OH)₂ = 40 + 2[16 + 1] = 74 g/mol
Mole of Ca(OH)₂ =?Mole = mass / molar mass
Mole of Ca(OH)₂ = 0.16 / 74
Mole of Ca(OH)₂ = 0.00216 mole Next, we shall determine the molarity of the stock solution of Ca(OH)₂.Mole of Ca(OH)₂ = 0.00216 mole
Volume = 100 mL = 100 / 1000 = 0.1 L
Molarity of Ca(OH)₂ =?Molarity = mole / Volume
Molarity of Ca(OH)₂ = 0.00216 / 0.1
Molarity of Ca(OH)₂ = 0.0216 MNext, we shall determine the molarity of the diluted solution. This can be obtained as follow:Volume of stock solution (V₁) = 100 mL
Molarity of stock solution (M₁) = 0.0216 M
Volume of diluted solution (V₂) = 250 mL
Molarity of diluted solution (M₂) =?M₁V₁ = M₂V₂0.0216 × 100 = M₂ × 250
2.16 = M₂ × 250
Divide both side by 250
M₂ = 2.16 / 250
M₂ = 0.00864 MThus, the molarity of the diluted solution is 0.00864 M
Finally, we shall determine the concentration of the hydroxide ions, OH¯ in the diluted solution. This can be obtained as follow:Ca(OH)₂(aq) —> Ca²⁺(aq) + 2OH¯(aq)
From the balanced equation above,
1 mole of Ca(OH)₂ contains 2 moles of OH¯
Therefore,
0.00864 M Ca(OH)₂ will contain = 2 × 0.00864 = 0.01728 M OH¯
Thus, the concentration of the hydroxide ions, OH¯ in 250 mL of the solution containing the maximum amount of dissolved calcium hydroxide is 0.01728 M
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which two particles would be attracted to each other?
Answer: protons and electrons.
Explanation:
Convert 19 rabbits into jackalopes, given that 5 rabbits = 8 hares and 10 hares = 13 jackalopes.
Answer:3 9 jackalopes
Explanation: given that five rabbits are equal to eight hares and ten hares are also equal to thirteen jackalopes:
19 rabbits =31 hares by (19×8)/5 so 31hares =39 jackal by 31×13/10
An electrochemical cell was designed using magnesium anode and zinc cathode calculate the EMF of the cell
Will the reaction be spontaneous or not? Give reason for your answer
When the cell potential is positive then the electrochemical reaction is spontaneous. The Ecell is positive when Zn serves as cathode and Mg serves as anode hence the reaction is spontaneous.
An electrochemical cell is any type of cell in which energy is produced by a spontaneous chemical reaction. Redox reactions that occur in an electrochemical cell produce energy.
An electrochemical cell becomes spontaneous only when Ecell is positive. Ecell is positive when a metal that has a more negative electrode potential serves as the anode.
Since Mg has a more negative electrode potential that Zn, it follows that a cell in which Mg is the anode and Zn is the cathode will have a positive Ecell and the reaction will be spontaneous.
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What two factors must be held constant for density to be a constant ratio?
Answer:
Temperature and Pressure
Explanation:
Temperature and pressure cause change in volume.
So any change in volume will alter the ratio of density as given by equation of density.
Density = mass/ volume
Change in volume will alter the ratio.
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Beth measured her brand new figurine to be
17.550 cm tall. However, the manufacturer
claims that it is 17.260 cm tall. What is the
percent error in Beth's measurement?
A 1.68%
B
1.65%
Answer: A
Explanation: I just answered mine
As the volume of a gas at 101.3kPa changes from 30mL to 95mL the volume of the gas will?
1)Increases
2) Decreases
3 Remains the same
which will have a greater volume: 10 grams of liquid water or 10 grams of solid water?
What is the range of valence electrons that metals have?
What is patagium and what do you meant by prehensile tail
The patagium (plural: patagia) is a membranous structure that assists an animal in gliding or flight. The structure is found in living and extinct groups of animals including bats, birds, some dromaeosaurs, pterosaurs, gliding mammals, some flying lizards, and flying frogs.
A prehensile tail is the tail of an animal that has adapted to grasp or hold objects. Fully prehensile tails can be used to hold and manipulate objects, and in particular to aid arboreal creatures in finding and eating food in the trees.
Answer:
patagium in American English
1. a wing membrane, as of a bat. 2. the extensible fold of skin of certain insects or of a gliding mammal or reptile, as a flying squirrel.
Explanation:
A prehensile tail pertains to the tail of certain animals that enable the latter to grasp or hold objects. ... A fully prehensile tail is one in which the animal can fully hold on to and manipulate an object with its tail.
When the skydiver is falling at a constant velocity after the parachute is open, what is their acceleration?
Answer:
Once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward. ... The skydiver thus slows down. As the speed decreases, the amount of air resistance also decreases until once more the skydiver reaches a terminal velocity.
When the skydiver is falling at a constant velocity after the parachute is open, acceleration is zero.
The acceleration of the skydiver will be zero shortly after the parachute opens, but we can not call it as “acceleration due to gravity”.It's the acceleration due to gravity and air resistance together, and the forces cancel each other out to give an acceleration of zero.Once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward.Learn more:
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1. Select the animals which are vertibrates
A. Tigers
B. Lions
C. Butterfly
D. Frogs
E. Ants
F. Spiders
G. Dogs
H. Cats
I. Eagles
J. Snail
Answer:
A.Tigers
B.Lions
C.Frogs
G.Dogs
H.Cats
I.Eagles
Atoms share one or more pairs of electrons.
Options:
Ionic Bond or Covalent Bond?
Answer:
covalent bonds
Explanation:
ionic transfer of e^- ions formed (charges)
ionic=non-metal+ metal
ex: F+Ca
covalent sharing e^- no true charges
covalent= non-metal+ non-metal
ex: F+P
( my notes)
What is the wavelength of a radio wave that has a frequency of 9.40 X 10^8Hz?
3.1
quotes for climate change
for example ‘’CLIMATE CHANGE IS REAL!’’
‘’SMALL CNAGES CAN MAKE A DIEFFENCE!’’
give me 3 and more
Answer:
Explanation:
WAKE FOR CLIMATE CHANGE IS NOT FAKE
SAVE THE GLACIERS
HELP THE ARCTIC ANIMALS
Since sodium chloride is classified as a compound, a sample of it contains
A. atoms that are gases, liquids, and solids.
O
B. more than one kind of atom.
C. matter that cannot be reduced to atoms.
O
D. a solution of atoms and molecules.
Answer:
more than one kind of atom. a solution of atoms and molecules.
Explanation:
a compound always contains more than one type of atom.
Although the formula for sodium chloride is NaCl, the compound does not contain actual NaCl molecules. Rather, it contains equal numbers of sodium ions with a charge of positive one (Na+) and chloride ions with a charge of negative one (Cl−).
negative ions form when atoms _______ valence electrons.
Answer:
Negatively charged ions are called anions, and an anion is formed when an atom gains an electron. Thus, the atom has an extra charge of electrons,
Explanation:
so it becomes negatively charged.
Negative ions (or anions) are atoms that have gained electrons.
Electrons have a negative charge so if an atom is getting more of them, it's becoming more negative.
Do the boiling points and melting points of these elements support the claim that elements of the same group have similar physical characteristics?
Answer:
Elements in the same group has different physical properties such as boiling and melting points. However there are trends of their physical properties down the group.
Explanation:
You should look at the perdoic table to for extra help
The boiling points and melting points of the given elements does not support the claim that elements of the same group have similar physical properties.
What are boiling point and melting point?The boiling point of a substance is the temperature at which it changes from liquid state to gaseous state. Melting point is the temperature at which the substance changes from solid to liquid state.
Elements in the same group shows similar physical and chemical properties. But from the boiling and melting point we cant say that they are in the same group.
Elements in a group shows a trend in boiling point and melting point but cannot be distinguished with this from other groups.
Hence, boiling point and melting point of the elements do no support for the similar properties in a group.
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Your question is incomplete, but most probably your full question was,
Do the boiling points and melting points of these elements support the claim that elements of the same group have similar physical characteristics? (image uploaded)
Which factor of production would water be considered?
A) Land
B)Labor
C) capital
D)entrepreneurship
Explanation:
land.
I think it is the answer
Answer:
land .......................
Someone help me with this I will make you brain
Answer:
D, took the test
Explanation:
Answer:
D: To show how using a list of examples can strengthen a claim
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Briefly discuss the 3 most important properties of metals
Answer: Luster: Metals are shiny when cut, scratched, or polished.
Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped.
Conductivity: Metals are excellent conductors of electricity and heat.
Explanation: Hope this helped!
hello
Describe the structure of solid potassium iodide.
Answer:
Potassium iodide is a metal-halide salt that has an ionic connection between the potassium cation (K+) and the iodide anion (I–). It is colorless to white and appears as cubical crystals, powder, or white granules. It has a salty, astringent flavor. This chemical is made from iodine and potassium hydroxide.
A central atom is found to have one double bond, one single bond, and one non-bonding pair of electrons. how many electron domains does the central atom have?
Answer:
A central atom is found to have one double bond, one single bond, and one non-bonding pair of electrons
What happens if metal is in acid?
I'm having a blank
Answer:
it dissolves or disintegrates
Explanation:
Why do you think lone pairs of electrons create greater repulsion when located near other
lone pairs or bonding pairs? Orbitals containing lone pairs of electrons require more space
than orbitals containing bonding pairs. Why do you think this is the case? What does the
presence of one or more lone pairs of electrons do to the bond angles in a molecule (in other
words, do bond angles get larger, smaller, or remain unchanged?)
When there are lone pairs on the valence shell of the central atom in a molecule, the bond angle is decreased.
The shape of molecules depend on the number of electron pairs on the valence shell of the molecules. These electron pairs could be lone pairs or bond pairs. Lone pairs occupy more space around the central atom since it is attracted to only one nucleus compared to bond pairs which are attracted to two nuclei.
When lone pairs are present on the central atom in a molecule, they tend to "squeeze" the molecule thereby decreasing the bond angle in the molecule. Hence, presence of one or more lone pairs of electrons make the bond angles get smaller.
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