Descreva as principais caracteristícas dos compostos ionicos
Answers
a) They are solid at ambient temperatures of 25 ° C and pressure of 1 atm.
b) Ionic compounds represent high temperature melting and boiling.
c) They are hard and brittle and then subjected to the impact, break easily, creating planar faces.
d) When dissolved in water, or pure liquid, carry electrical current due to the existence of ions that move freely and can be attracted by the electrodes, closing the electric circuit.
e) His solvent is water.
Related Questions
The apparent westward movement of a planet against the background of stars is called ____. (1 point)retrograde motion revolution rotation universal gravitation
Which characteristics both generally decrease when the elements in Period 3 on the Periodic Table are considered in order from left to right?(1) nonmetallic properties and atomic radius(2) nonmetallic properties and ionization energy(3) metallic properties and atomic radius(4) metallic properties and ionization energy
Glycerol boils at a higher temperature than water. What does this indicate about the attractive forces of glycerol?
Which of these is always equal to the molar mass of any element?its atomic number its atomic weight its atomic formula its atomic structure
Answers
Answer:
Moles of Carbon in the product = 0.183 mol
Explanation:
Complete combustion of an organic compound in the presence of excess oxygen will give carbon dioxide (CO2) and water vapour(H2O).
Equation of reaction
CxHyOz(s) + (2x + y/2 - z)/2 O2(g) --> x CO2(g) + y/2 H2O(l)
Moles of products
CO2
Molar mass of CO2 = 12 + (16*2)
= 44 g/mol
n(CO2) = 8.07/44.0
= 0.183 mol
One compound of CO2 has 1 Carbon atom and 2 Oxygen atom.
So if we have,
0.183 moles of carbon dioxide then
0.183 moles of carbon.
The mass of carbon in the product, m = 0.183*12
= 2.20 g
H2O:
Molar mass of H2O = (1*2) + 16
= 18 g/mol
Number of moles of H2O =
= 3.3/18
= 0.183 mol
One compound of H2O has 2 Hydrogen atom and 1 Oxygen atom.
0.183 moles of water then we also have
= 2*(0.183)
= 0.367 moles of hydrogen in the sample.
The mass of hydrogen in the compound, m
= 0.367*1
= 0.367 g
Adding these two values together will give us the mass of our compound that C and H;
2.2 + 0.367
= 2.567 g
So for the Oxygen,
5.5 g - 2.567
= 2.933 g
Moles of Oxygen;
Molar mass of O = 16 g/mol
= 2.933/16
= 0.183 mol
There are 0.030 moles of carbon in the original sample as per the mole concept.
Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is given by the formula,
The given values are,mass=
molar mass=
Substitution of values in formula gives,
Thus, there are 0.030 moles of carbon in the original sample as per the mole concept.
Learn more about mole concept,here:
#SPJ3
Answers
Answer : always the same
i took the test lol
Aspirin is less soluble than table salt, but more soluble than carbon dioxide.
A saturated solution of table sugar is more concentrated than a saturated solution of table salt.
Answers
Answer:
1,3
Explanation:
got it right on assignment
Answer: A, C and D
Explanation: For me it was D a well as of edge 2022. Hope this help!
2. Silver
3. Copper
4. Sulfur
Answers
Potassium is one of the alkali metals; alkali metals are the most active metals.
Potassium is so active that it never occurs free in nature. It always occurs in compounds, combined with other elements.
95% of potassium is used as fertilizers, the remaining 5% is divided into creating potassium hydroxide, potassium chloride solution, and potassium carbonate.
Potassium hydroxide is used to make soaps and detergents.
Potassium chloride is used in pharmaceuticals, medical drips, and saline injections.
Potassium carbonate is used in glass manufacturing; particularly, glass used in television sets.
Other potassium salts are used in making iodized salts, used in baking, tanning leather, and photography.
Final answer:
Potassium is the element that is so active chemically that it occurs naturally only in compounds.
Explanation:
The element that is so active chemically that it occurs naturally only in compounds is potassium.
Potassium is a highly reactive alkali metal that is commonly found in nature bonded to other elements in compounds. It is not found in its pure form due to its reactivity.
An example of a compound that contains potassium is potassium chloride (KCl), which is commonly used as a salt substitute.
Learn more about Potassium here:
#SPJ11
Answers
A chemist places a flask containing the reactant in an ice bath. This will decrease the rate of reaction.
Answer:
give them brainliest
Explanation:
Answers
Answer:
It could possibly cause damage to the person lighting the firework and would quicken the ignition time.
Explanation:
The purpose of the longer fuse is so the person can run back in enough time to reach safety. Shortening that fuse can cause serious danger. The role of the fuse is to delay ignition.
Final answer:
If the secondary fuse of an aerial firework is too short, the firework would explode prematurely, potentially presenting a danger to operators and spectators.
Explanation:
In the context of aerial fireworks, fuses are critical components that control the timing of explosions. If the secondary fuse in an aerial firework is too short, the firework would explode prematurely, potentially before it even leaves the ground or far below the intended altitude. The short fuse wouldn't provide the requisite delay, which is normally intended to allow the firework to reach its maximum altitude before exploding. This could pose safety risks to those operating the fireworks and the nearby spectators as well.
Learn more about Aerial Fireworks here:
#SPJ3