las diferencias fundamentales del entramado urbano antes y despues de 1750
Answer:?
?Explanation:
Sodium (Na) and iodine gas (I2) react to form sodium iodine (NaI).
Which equation is a correct representation of the balanced equation?
2Na+I2→2NaI
I2→2NaI+2Na
Na→NaI+I2
NaI→2Na+I2
Answer:
2Na+I2→2NaI
Explanation:
What metal forms an ionic compound with nitrogen with the general formula X3N?
Answer:
B. Lithium (Li)
Explanation:
Lithium forms an ionic compound with nitrogen with the general formula X₃N. When lithium and nitrogen react, they form a nitride called lithium nitride.
The Lithium nitride is actually prepared by the direct combination of elemental lithium with nitrogen gas. Below is the reaction equation:
6Li + N₂ → 2Li₃N
The reaction can occur when a solution of lithium in liquid sodium metal is treated with N₂. When the Lithium nitride reacts with water, it does that violently and produces ammonia.
how many moles of aluminum are needed to produce 2.8 moles of aluminum chloride
Answer:
1.4 mol
Explanation:
that my i got i was doing for it
is facilitated diffusion passive or active transport?
Answer:
Its passive
Explanation:
Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins.
PLEASE HELP
In the equation 2KCIO3 → 2KC1 + 302, how many moles of oxygen are produced when 3.0 mol of KCIO3 decompose completely?
Moles of Oxygen produced : 4.5 moles
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
The reaction coefficient shows the mole ratio of the reactants and products
Reaction
2KCIO₃ → 2KCl + 30₂
moles of KCIO₃ = 3
From equation, mol ratio of KCIO₃ : O₂ = 2 : 3, so mol O₂ :
[tex]\tt mol~O_2=\dfrac{3}{2}\times 3=4.5[/tex]
Sodium hydroxide solution was added to dilute hydrochloric acid. The pH of the solution in the flask was measured at intervals until no further change of pH took place. What would be the pH change in this reaction?
Answer:
The pH change will be neutral. I.e pH of 7.
Explanation:
The pH change will be neutral because reaction between hydrochloric acid and sodium hydroxide will result in the formation of sodium chloride salt and water. Sodium chloride salt and water is neutral because reaction between strong acid(pH is acidic) and strong base( pH is basic) will produce neutral salt with pH of 7. This salt does not hydrolyze.
I WILL MARK BRAINLIEST ANSWER!
Which statement describes heterogeneous mixtures?
1. They are made up of two or more Pure substances that are not chemically bonded together and appear non-uniform
2. The substances they are composed of can only be separated chemically
3. The substances they are composed of have fixed ratio between their components
4. They are made up of two or more pure substances that are chemically bonded together appear uniform
Answer:
1. They are made up of two or more Pure substances that are not chemically bonded together and appear non-uniform
Explanation:
edge2020 :)
Heterogenous mixtures are made up of two or more substances that are not chemically bounded together and which appear non-uniform.
What are heterogenous mixtures?Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.
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The Great Plains are also referred to as____.
Answer:
The interior plains
Answer:
interier plains
Explanation:
What do atomic-scale models show you that your observations of properties cannot?
The amount of protons in an atom's nucleus is what is known as the atomic number, according to models at the atomic scale. The identification of an element is determined by its proton count.
What is atomic-scale model?Everybody is aware that the things around us are formed of matter. We also know that the three subatomic particles are electrons, protons, and neutrons. But an atom has where all of these subatomic particles live. This essay will address all of these questions and describe how important Atomic Model breakthroughs were produced.
In order to better define and comprehend the atomic structure, we have developed five fundamental Atomic Models. The amount of protons in an atom's nucleus is what is known as the atomic number, according to models at the atomic scale. The identification of an element is determined by its proton count.
Therefore, the amount of protons in an atom's nucleus is what is known as the atomic number, according to models at the atomic scale. The identification of an element is determined by its proton count.
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3. If x electrons are needed to displace 108 g silver from a solution which contains Ag+ ions how many electrons are needed to displace 9g of aluminium from solution which contains Al3+
What happens when balanced forces act on an object at rest?
Answer:
Balanced forces do not cause a change in motion.
The result is no motion. Balanced forces can cancel each other out. Any time there is a balanced force, the object does not move.
Explanation:
Answer:
The result is no motion. Balanced forces can cancel each other out. Any time there is a balanced force, the object does not move.
Explanation: MARK MOST BRAINLIEST PLEASE
A 22 g sample of water is heated until it reaches a temperature of 73 °C. This sample
is placed in a calorimeter that contains 23 mL of H20 at 41 °C (use dH20 = 1.0 g/mL).
If the Cs of water is 4.18 J/g°C what is the final temperature of the water? (assume
that all the heat of the hot water goes into heating up the cold water until the two are
at thermal equilibrium and no heat is lost to the environment)
Answer:
56.64°c
Explanation:
its obtained from facts that heat gained by water=heat lost by calorimeter
This is actually fun. First comment is brainliest.
Answer:
sup, how ya doin?
Explanation:
Which energy output objects work with the solar panels?
Answer:
A converter to convert from dc to ac
Explanation:
The atomic number of an element is 15. What is the likely arrangement of the valence and core electrons in a neutral atom of this element?
The element has :
core electrons : 10valence electron : 5 Further explanationValence electrons : electrons used in forming bonds (the outer shell)
Core electrons : electrons that belong to atoms except for valence electrons. It is located close to the core and fills the inner shell.
Electron configurations for an element with the atomic number: 15 1s²2s²2p⁶3s²3p³
Neutral atoms ⇒ atomic number= number of protons=number of electrons
The electron configuration shows that the valence electron of the element = 5(3s²3p³) so the number of Core electrons:
Core electron = atomic number (total number of electrons) - valence electron
Core electron = 15 - 15
Core electron = 10
Which of the following statements is NOT true about Olympus Mons?
It is 3 times as high as Mount Everest.
O Its base is about the same size as Arizona.
It is the largest mountain in the solar system.
It have never erupted.
Answer:
The largest of the volcanoes in the Tharsis Montes region, as well as all known volcanoes in the solar system, is Olympus Mons. Olympus Mons is a shield volcano 624 km (374 mi) in diameter (approximately the same size as the state of Arizona), 25 km (16 mi) high, and is rimmed by a 6 km (4 mi) high scarp.
Explanation:
A structure that carries a single unit of hereditary information is a what
Answer: chromosomes is the answer hope this helps
Explanation:
How many moles are in 0.0688 g of silver chloride (AgCl)
Answer: 0.00048
m
o
l
Explanation:
Moles = Mass/Molar mass
n
=
m
M
r
=
0.0688
107.87
+
35.5
=
0.00048
m
o
l
When you dissolve an antacid tablet in water and it produces bubbles, what kind of change is this?
A. a physical change
B. a chemical change
C. a solution change
Answer: B. a chemical change
Explanation:
How many moles are in 4.78 * 10 ^ 24 molecules of hydrogen peroxide, H2O2
Answer:
7.94 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.78 \times {10}^{24} }{6.02 \times {10}^{23} } \\ =7.940199...[/tex]
We have the final answer as
7.94 molesHope this helps you
Suppose a snack bar is burned in a calorimeter and heats 2,000 g water by 20 °C. How much heat energy was released?
Heat energy released : 167.2 kJ
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
m = 2000 g
c = 4.18 J/ g ° C
∆t = 20 ° C
[tex]\tt Q=2000\times 4.18\times 20\\\\Q=167200~J=167.2~kJ[/tex]
An ice cube and a scoop of table salt are left outside on a warm sunny day. explain why the ice cube melts and the salt does not.
The melting point of ice is 0 degrees Celcius, which means it exists as a liquid for any temperatures above 0 degrees. The melting point of salt is approximately 800 degrees Celcius, which is way greater than the melting point of ice. This means that for temperatures below 800 degrees, salt exists as a solid.
The temperature of the area where they were placed we can assume was somewhere between 0 and 800 degrees, greater than the melting point of ice but less than the melting point of salt. This why the ice melted but the salt did not.
I hope this helps!
Which describes the dissolving process? (Choose all that Apply)
A) All molecules are in constant motion, so they run into each-other.
B) Molecules bond with the solvent forming a chemical reaction.
C) Collisions of molecules is what makes a substance dissolve
D) Molecules of the solvent bombard molecules of the solute.
Answer:
A and D
Explanation:
I took the test, and choose both B and C and got it wrong
Which of the following molecules have the weakest attraction to each other?
F2
Cl2
Br2
Answer:
Explanation:
F2 have the weakest attraction to each other because of higher electronegativity when they are brought close to each other they repel each other
1. Which scenario best describes Newton's 1st law?
Answer:
option B . because acording to Newton 1st law until or unless you donot apply force the object will not move or stops.
Explanation:
which of the folllowing
Answer:
I think its cadmium pliz mark brainliest if helpful
The energy levels of an atom are occupied by
A.electrons
B.protons
C.neutrons
D.ions
Answer:
A: electrons
Explanation:
What is the percent yield of a reaction?
a.the difference between measured and calculated amounts
b.the amount of product obtained / amount possible x100
c. The amount of product actually obtained in a reaction
d. The amount of product that is possible from a reaction
Answer:
B
Explanation:
A P E X
The amount of product obtained / amount possible x100. Hence, option B is correct.
What is the per cent yield of a reaction?To express the efficiency of a reaction, calculate the per cent yield using this formula:
%yield = (actual yield/theoretical yield) x 100.
A per cent yield of 90% means the reaction was 90% efficient, and 10% of the materials were failed and not in use.
Hence, option B is correct.
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during conduction heat is transferred by the movement of currents within a fluid true or false
Answer:
True i think
Explanation:
Answer:
Yes
Explanation:
Water is an example because heat touches the bottom of the sea without being nullified
