Answer:
potassium
The third alkali metal is K (potassium). The atomic number of K (potassium) is 19. Thus, the atomic number of third alkali metal is 19
Explanation:
To get the PH we are going to use Henderson - Hasselblach equation:
PH = Pka + ㏒ [A/AH]
when the molar mass of Na2HPO4 = 142 g/mol
and A is the conjugate base HPO4-- ions so,
∴[A] = 26g / 142 g/mol
= 0.183 M
and when the molar mass of KH2PO4 = 136 g/mol
and AH is the weak acid H2PO4- ions so,
∴[AH] = 13 g / 136 g/mol
= 0.096 M
and when we have the Pka value of H3PO4 = 7.21
so, by substitution:
∴ PH = 7.21 + ㏒ (0.183 / 0.096)
= 7.49
Answer:
Overall reaction equation is:
Cl2(g) + CHCl3(g) --> HCl(g) + CCl4(g)
The intermediates are Cl(g), CCl3(g).
Rate law= ka^1/2 c
Explanation:
This reaction is a non elementary reaction. A non elementary reaction is one that does not take place in a single reactive encounter. In other words, the reaction is comprised of many steps.
The overall reaction equation is the sum of all the reaction steps after all intermediates have been cancelled out. The rate law is obtained from the slowest step in the reaction sequence.
Answer:
B.
Explanation:
The telescopes of the 1600s were gradually improved upon over time, resulting in the telescopes that are available today.
Answer:
The correct answer would be "They could allow scientists to explore remote places, like other planets, in new ways".
As the artificial muscles are lightweight and can withstand high temperatures they can be used efficiently in exploring remote places, stars, or planets where humans can not survive.
For example, they can be used to explore the inner or outer core region of the earth which would help us more in understanding the earth.
Similarly, robots with these types of muscles can be used to obtain samples from other planets which have a very high temperature such as mercury.