You ask 3 friends to each flip a penny 25 times, then report the probability the penny shows tails. Your friends report probabilities of $0.44$, $0.48$, and $0.60$. You say the probability is $0.5$. Can everyone be right? Explain.

For each of the following sentences, underline the correct word or word group in parentheses. Base your answer on formal, standard usage.

Will you (lend, loan) me your umbrella?

Using only the elements P, Br, and Mg, give formulas for the following:

(a) an ionic compound

(b) a molecular compound with polar covalent bonds that obeys the octet rule and has no formal charges

On the line in each sentence, write the correct form of who, whom, or whose according to the rules of standard, formal usage. Sami asked me --- I had met at the station.

In given of the following sentence, underline the word or words in parentheses that are correct according to the rules of formal, standard English.
Keidron was happier (than, then) Kelly was about their move to a new town.

Based on the concept of formal charge, what is the central atom in (a) $\mathrm{HCN}$ (do not include $\mathrm{H}$ as a possibility)? (b) $\mathrm{NOCl}(\mathrm{Cl}$ is always a terminal atom)?

For each of the following sentences, choose the correct word or words in parentheses. Base your answers on the rules of standard, formal usage.

The temperature has warmed (some, somewhat).

Assign formal charges to the atoms in the following species, and then select the more likely skeletal structure. (a) $\mathrm{H}_2 \mathrm{NOH}$ or $\mathrm{H}_2 \mathrm{ONH}$

$$\textbf {\color{#19804f}{Summarizing Information}}\text { Read the article ''Life's Crucible," by Peter Radetsky (Earth, February 1998, vol. 7, pp. 34-41). Write a report explaining the different hypotheses that scientists say could explain the origin of life. In your report, describe the flaws in the hypotheses and explain why scientists think there could be life on Europa or Mars. Share your report with the class.}$$

Draw orbital diagrams to show the orbitals that are involved in the $\sigma$ and $\pi$ bonding in furan.[Hint: You need to use only one of the contributing structures, such as the one with no formal charges .]

Circle the BEST answer.
You gave a person the wrong treatment. Which is true?
a Report the error at the end of the shift.
b Take action only if the person was injured.
c You are guilty of negligence.
d You must complete an incident report.

For each of the following sentences, choose the correct word or words in parentheses. Base your answers on the rules of standard, formal usage.

The rescuers looked (like, as if, as) they had not slept.

Write Lewis structures for these ions: (a) $\mathrm{O}_2^{2-}$, (b) $\mathrm{C}_2^{2-}$, (c) $\mathrm{NO}^{+}$, (d) $\mathrm{NH}_4^{+}$. Show formal charges.

You're probably already familiar with the items above. Skim them briefly and then complete the following statement.

These items are.

TV schedules and sports scores

report cards and TV schedules

sports scores and class schedules

class schedules and report cards