According to this formula:
pH = - log [H]
And, pOH = - log [OH] >>> (1)
Where, pH + pOH = 14 >>> (2)
∵ the hydroxide ion concentration = (OH-) = 10 ^ -10 M
from (1) and (2) and by substitution:
∴ pOH = - log [10^-10] = 10
∴ pH = 14 - 10 = 4
Answer:
i think is probably A
Explanation:
because at constant temperature, the product of the pressure and volume of a given mass of and ideal gass in a closed system is always constant
Answer:
Here is a bunch of info from my lesson to help you out...
Explanation:
All matter has physical and chemical properties. Physical properties are characteristics that scientists can measure without changing the composition of the sample under study, such as mass, color, and volume (the amount of space occupied by a sample). Chemical properties describe the characteristic ability of a substance to react to form new substances; they include its flammability and susceptibility to corrosion. All samples of a pure substance have the same chemical and physical properties. For example, pure copper is always a reddish-brown solid (a physical property) and always dissolves in dilute nitric acid to produce a blue solution and a brown gas (a chemical property).
Physical properties can be extensive or intensive. Extensive properties vary with the amount of the substance and include mass, weight, and volume. Intensive properties, in contrast, do not depend on the amount of the substance; they include color, melting point, boiling point, electrical conductivity, and physical state at a given temperature. For example, elemental sulfur is a yellow crystalline solid that does not conduct electricity and has a melting point of 115.2 °C, no matter what amount is examined (Figure 1.3.1
1.3.
1
). Scientists commonly measure intensive properties to determine a substance’s identity, whereas extensive properties convey information about the amount of the substance in a sample.
<h3>Further explanation</h3>
In the periodic system
The group number in the periodic system is determined by the same valence electrons (main group), while the period is determined by the number of shells
valence electrons :
- Transition metals: ns, (n-1) d, np
- Lanthanides and actinides: ns, (n-2) f, (n-1) d, np
Valence electrons for the main group: Group 1,2,13-18
Lanthanides and actinides: Group 3–16
Transition metals: Group 3–12
1. Valence electron : 4s²
Group 2
Period 4
2. Valence electron : 2s²2p²
Group 14
Period 2
3. Valence electron : 3s²3p⁴
Group 16
Period 3
4. Valence electron : 4s²3d⁸
Group 10
Period 4
5. Valence electron : 5s²5p⁶
Group 18
Period 5
6. Valence electron : 7s²
Group Lanthanides and actinides (6)
Period 7
Positive is numbers above 0 on the number line
