Answer:
Se llaman bioelementos primarios. Los átomos de carbono tienen la capacidad de unirse a otros átomos. Esto permite que tenga lugar la vida y es por eso que el carbono es el bioelemento más importante. Otros elementos químicos se encuentran en los seres vivos; sin embargo, aparecen en pequeñas cantidades.
Explanation:
Answer: 122 moles
Procedure:
1) Convert all the units to the same unit
2) mass of a penny = 2.50 g
3) mass of the Moon = 7.35 * 10^22 kg (I had to arrage your numbers because it was wrong).
=> 7.35 * 10^22 kg * 1000 g / kg = 7.35 * 10^ 25 g.
4) find how many times the mass of a penny is contained in the mass of the Moon.
You have to divide the mass of the Moon by the mass of a penny
7.35 * 10^ 25 g / 2.50 g = 2.94 * 10^25 pennies
That means that 2.94 * 10^ 25 pennies have the mass of the Moon, which you can check by mulitiplying the mass of one penny times the number ob pennies: 2.50 g * 2.94 * 10^25 = 7.35 * 10^25.
5) Convert the number of pennies into mole unit. That is using Avogadros's number: 6.022 * 10^ 23
7.35 * 10^ 25 penny * 1 mol / (6.022 * 10^ 23 penny) = 1.22* 10^ 2 mole = 122 mol.
Answer: 122 mol
Answer:
No precipitate will form on mixing potassium bromide and lead acetate
Explanation:
Precipitation occurs when the ionic product of the ions exceeds the solubility product of the corresponding salt in the solution. If, this implies that the solution is over saturated and precipitation of salt will occur.Potassium bromide and lead acetate are strong electrolyte and thus completely dissociate in water.
The dissociation reaction is given as,Potassium bromide and lead acetate react to give lead bromide and potassium acetate.The concentration of lead ions is equal to the concentration of.The concentration of bromide ion is equal to the concentration of.Potassium acetate is soluble in aqueous solution. Lead bromide will precipitate out if the ionic product of lead ion and bromide ion exceeds the solubility product of .
The value of solubility product constant,, for is.The reaction quotient for is calculated as,Substitute the values.The value of the reaction quotient for is less than its solubility product, , therefore, precipitation of will not occur.
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Answer:</h3>
An ionic bond is an attraction between oppositely charged ions. A covalent bond is a sharing of electrons between atoms.
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Explanation:</h3>
- Ionic bonds and covalent bonds are both types of chemical bonds.
- Ionic bonds are types of chemical bonds that are formed between a metal and non-metal atoms.
- Ionic bond formation involves the transfer of electrons from a metal atom to a non-metal atom. For example from a potassium atom to a chlorine atom.
- Metallic atom loses electrons to form a positively charged ion and non-metallic atom gains electrons to form a negatively charged ion.
- The electrostatic attraction between the oppositely charged ions results in an ionic bond.
- A covalent bond, on the other hand, occurs between non-metal atoms as a result of sharing electrons. For example, in a chlorine molecule, two chlorine atoms share electrons to form a chlorine molecule.
I would maybe say solid at higher temps