98. in order to assign oxidation states in po...
98. in order to assign oxidation states in polyatomic molecules, which of the following rules is followed?\n a. the oxidation of all elements in any allotropic form is zero.\n b. all other oxidation states are chosen that the algebraic sum of the oxidation states for the ions and molecules is zero.\n c. the oxidation state of oxygen is always -2.\n d. the oxidation state of hydrogen is always +1.\n99. what is the present value of p 10,000 to be received 20 years from now, if the principal is invested at 8% per year compounded annually?\n a. p 2743.20\n b. p 2387.34\n c. p 2145.48\n d. p 2546.32\n100. the difference between people with access to computers and the internet and those without this access is known as the\n a. digital divide.\n b. web divide.\n c. internet divide.\n d. broadband divide.
Answer
### 98.
# Brief Explanations:
In polyatomic molecules, oxygen usually has an oxidation state of -2 (except in peroxides where it is -1). Hydrogen usually has an oxidation state of +1 (except in metal hydrides where it is -1). Rules for assigning oxidation states are followed to determine the oxidation states of all elements.
# Answer:
No options provided in the question - need to know the rules for oxidation - state assignment in polyatomic molecules.
### 99.
# Explanation:
## Step1: Recall present - value formula
The present - value formula for a future amount $F$ received $n$ years from now with an annual interest rate $r$ compounded annually is $P = \frac{F}{(1 + r)^n}$. Here, $F=\text{P}10000$, $n = 20$ years, and $r=0.08$.
## Step2: Substitute values into the formula
$P=\frac{10000}{(1 + 0.08)^{20}}$.
## Step3: Calculate the result
$(1 + 0.08)^{20}\approx4.66095714$. Then $P=\frac{10000}{4.66095714}\approx\text{P}2145.48$.
# Answer:
c. P 2145.48
### 100.
# Brief Explanations:
The digital divide refers to the gap between people who have access to computers and the internet and those who do not.
# Answer:
a. digital divide