Question 1

Bismuth-213 is used in targeted alpha therapy (TAT) for cancer treatment. If its half-life is 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 8 protons and 10 electrons. What is its symbol and charge?

Accepted Answer

$$\mathrm{O$$^{2-}$$}$$

Question 4

What is the correct formula for the ionic compound formed between cesium and oxygen?

Accepted Answer

$$\mathrm{Cs_2O}$$

Question 5

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

Accepted Answer

chromium(III) bromide

Question 6

What 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 statement is correct?

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 an oxygen atom typically 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 polar due to its molecular geometry and the presence of different atoms attached to the central atom?

Accepted Answer

$$\mathrm{$$CHFCl_2$$}$$

Question 14

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

Accepted Answer

hydrogen bonding

Question 15

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

Accepted Answer

$$1\ \mathrm{Zn(s)} + 2\ \mathrm{HCl(aq)} \rightarrow 1\ \mathrm{$$ZnCl_2$$(aq)} + 1\ \mathrm{H_2$(g)}$$

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 ions formed by elements in Group 7A (17) when they react?

Accepted Answer

$$1-$$

Question 18

A patient is given a medication containing $$\mathrm{NaOH}. $$What is the major type of intermolecular force between $$\mathrm{NaOH}$$ molecules?

Accepted Answer

ionic bonding

Question 19

Which of the following best describes the bonding in $$\mathrm{CO_2$}$$?

Accepted Answer

Covalent bonds formed by sharing of electrons between non-metal atoms

Question 20

Which of the following formulas represents cobalt(II) acetate?

Accepted Answer

$$\mathrm{Co(C_2H_3O_2)_2}$$

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

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