A base generally releases a hydroxide ion (OH-) when dissolved in water.
There are exceptions, such as ammonia NH3, which acts as a base but does not produce OH- ions. There are three definitions of acids and bases (Arrhenius, Bronsted-Lowry, and Lewis) and each one looks at acid/base characteristics differently. OH- donation is the Arrhenius definition.
2 H₂O (l) → 2 H₂ (g) + O₂ (g)
Molar mass water = 1.01 x 2 + 16.00 = 18.02 g/mol
Number of mol water decomposed = 28.7 g H₂O x [1 mol / 18.02g] = 1.59 mol H₂O
<span>From the balanced equation 2 mol H₂O decomposes to 2 mol H₂ and 1 mol O₂ </span>
so the mole ratio water : oxygen = 2 : 1
and number of mol O₂ produced = ½ x 1.59 = 0.796 mol O₂
The ideal gas law is PV = nRT
so V = nRT/P
P = 0.986 atm
V = ?
n = 0.796
R = 0.0821 L atm K⁻¹ mol⁻¹
T = 294K
V = 0.796 x 0.0821 x 294 / 0.986
V = 19.5 L
<span>So 19.5 L O₂ gas are produced
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Answer:
C: No correct response
Explanation:
Bond length is simply defined as the distance between two atoms that are participating in a bond.
Now, looking at the options, none of the options correctly defines it this way. The closest is option E which is "distance between two electrons" but it uses the word electrons instead of atoms. Thus none of the statements are correct
Answer:
Explanation:
Columns and rows used in the periodic classification of elements shows trends in the properties of elements.
The periodic columns are called groups and they denote vertical arrangement of elements.
The horizontal rows are the periods.
- Groups and Periods provides a very simple way to classify elements.
- They reflect trends among different elements that are found in nature. Following these groups and periods, it is even possible to predict the nature of an undiscovered element.
- Certain parts of the table have some unique elements on them with some distinctive properties that distinguish them from others.
- The atomic number is the basis of this classification. By this, it is possible to delineate that elements with similar properties are located on the same group.
Answer:
a number assigned to an element in chemical combination which represents the number of electrons lost (or gained, if the number is negative), by an atom of that element in the compound
Explanation:
sodium, magnesium, iron is zero.
