Question 1

Bismuth-213 is used in targeted alpha therapy (TAT) for cancer treatment. If a sample of Bismuth-213 has a half-life of 46 minutes, how many half-lives have elapsed after 276 minutes?

Accepted Answer

6

Question 2

Which of the following compounds is covalent?

Accepted Answer

$$\mathrm{C_2H_6}$$

Question 3

An ion has 19 protons and 18 electrons. What is its symbol?

Accepted Answer

$$\mathrm{K^+}$$

Question 4

What is the correct formula for the ionic compound formed between strontium and bromine?

Accepted Answer

$$\mathrm{$$SrBr_2$$}$$

Question 5

What is the correct name for $$\mathrm{$$CrBr_3$$}$$?

Accepted Answer

chromium(III) bromide

Question 6

Which of the following is the correct formula for iron(III) sulfate?

Accepted Answer

$$\mathrm{Fe_2$(SO_4$)_3}$$

Question 7

In a molecule composed of covalently bonded atoms, which of the following is true?

Accepted Answer

Non-metal atoms are bonded to non-metal atoms through sharing of electrons.

Question 8

How many covalent bonds and lone pairs does a typical oxygen atom have in a molecule?

Accepted Answer

2 bonds, 2 lone pairs

Question 9

Which of the following molecules has a tetrahedral molecular geometry?

Accepted Answer

$$\mathrm{CH_2Cl_2}$$

Question 10

What is the correct name for $$\mathrm{NO_2$}$$?

Accepted Answer

nitrogen dioxide

Question 11

What is the correct formula for dinitrogen trioxide?

Accepted Answer

$$\mathrm{N_2O_3}$$

Question 12

Which bond is more polar: $$\mathrm{C-O} or$$ $$\mathrm{C-N}$$?

Accepted Answer

$$\mathrm{C-O}$$

Question 13

Which of the following molecules is nonpolar due to its symmetrical shape, despite having polar bonds?

Accepted Answer

$$\mathrm{$$SiCl_4$$}$$

Question 14

Which type of intermolecular force is the strongest in $$\mathrm{NH_3$}$$?

Accepted Answer

Hydrogen bonding

Question 15

Balance the following reaction used in forensic fingerprint analysis: $$\mathrm{Zn(s) + HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)}$$

Accepted Answer

$$1, 2, 1, 1$$

Question 16

Which of the following is a double replacement reaction?

Accepted Answer

$$\mathrm{BD + AC \rightarrow AB + CD}$$

Question 17

What is the charge of the ion formed when an element from Group 6A (16) reacts?

Accepted Answer

$$2-$$

Question 18

Which of the following best explains why $$\mathrm{$$CHFCl_2$$} is a $$polar molecule?

Accepted Answer

It has polar bonds and an asymmetrical shape, resulting in a net dipole moment.

Question 19

Which of the following compounds would you expect to have the highest boiling point due to its intermolecular forces?

Accepted Answer

$$\mathrm{NaOH}$$

Question 20

A patient is given a medication containing $$\mathrm{CsCl}. $$What type of bonding is present in this compound, and what is the charge on the cesium ion?

Accepted Answer

Ionic bonding; $$1+$$

Step-by-Step Guidance for Sample Midterm 2 (GOB Chemistry)

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