Module 3; atoms, molecules, and ions

What is the mass number for an atom of selenium that has 45 neutrons? 34 11 79 45

79

What type of chemical bond is present in NiBr2? An ionic bond NiBr2 is a homogeneous mixture, so there is no chemical bond between Ni and Br. A covalent bond NiBr2 is a heterogeneous mixture, so there is no chemical bond between Ni and Br.

An ionic bond

An ion of which element could contain 33 protons, 42 neutrons, and 30 electrons? As3+ Zn3− Zn3+ As3−

As3+

Which pair of elements would most likely form an ionic compound? Sulfur and oxygen Calcium and oxygen Chlorine and oxygen Nitrogen and oxygen

Calcium and oxygen

1/1 What type of compound would form between nitrogen and oxygen? Ionic Atomic Metallic Covalent

Covalent

What type of bond would form between two atoms of nitrogen? Metallic Covalent Atomic Ionic

Covalent

Carbon dioxide has the formula CO2. Which of the following best describes carbon dioxide? Covalent compound Homogeneous mixture Ionic compound Heterogeneous mixture

Covalent compound

92

How many electrons are in this isotope? 146 238 92 330

50

How many neutrons does the isotope have? 128 50 89 39

1/1 A neutral atom has a mass number of 1. Which element is it? Hydrogen Helium Lithium Beryllium

Hydrogen

Rank this list of objects from largest to smallest: 1. Atom 2. Cell 3. Neutron 4. Electron 2, 1, 4, 3 1, 2, 4, 3 3, 4, 2, 1 2, 1, 3, 4

2, 1, 3, 4

Thallium has two stable isotopes, 203Tl and 205Tl. The average atomic mass of thallium is 204.38 amu. Which isotope is the more abundant of the two? They both have the same percent abundance. 205Tl There is not enough information to solve this problem. 203Tl

205Tl

What is the charge of an ion that contains 15 protons and 18 electrons? 3- 2+ 2- 3+

3-

Chlorine has two naturally occurring isotopes. One has a mass of 34.96885 amu and a percent abundance of 75.77%, and the other has a mass of 36.96590 amu and a percent abundance of 24.23%. Calculate the average atomic mass of chlorine. 35.33 amu 35.04 amu 35.45 amu 35.57 amu

35.45 amu

Rank the list of objects from smallest to largest: 1. Atom 2. Proton 3. Molecule 4. Electron 3, 1, 4, 2 4, 2, 1, 3 3, 1, 2, 4 2, 4, 1, 3

4, 2, 1, 3

Antimony, Sb, has two stable isotopes with an experimentally determined mass of 120.904 amu (121Sb) and 122.904 (123Sb). The average atomic mass of antimony is 121.757 amu. What are the relative abundances of these isotopes? 55.18% 121Sb ; 44.82% 123Sb 57.35% 121Sb ; 42.65% 123Sb 44.82% 121Sb ; 55.18% 123Sb 42.65% 121Sb ; 57.35% 123Sb

57.35% 121Sb ; 42.65% 123Sb

Gallium has two naturally occurring isotopes, 69Ga and 71Ga, with masses of 68.9257 amu and 70.9249 amu, respectively. The average atomic mass of gallium is 69.723 amu. What is the percent abundances of these isotopes of gallium? 45.7% 69Ga ; 54.3% 71Ga 39.9% 69Ga ; 60.1% 71Ga 54.3% 69Ga ; 45.7% 71Ga 60.1% 69Ga ; 39.9% 71Ga

60.1% 69Ga ; 39.9% 71Ga

What type of compound would form between a Group 16 element and an alkaline earth metal? Atomic Covalent Ionic Metallic

Ionic

What type of compound would form between an alkali metal and a halogen? Atomic Covalent Ionic Metallic

Ionic

Which of the following statements describes P4? P4 is a compound with ionic bonds. P4 is an element with neither covalent nor ionic bonds. P4 is an element with covalent bonds. P4 is a compound with covalent bonds.

P4 is an element with covalent bonds.

Which of the following objects is the smallest? Molecule Proton Nucleus Atom

Proton

A neutral atom has a mass number of 17 and 8 electrons. Which element is it? Oxygen Manganese Fluorine Chlorine

Oxygen

What is the charge of an ion that contains 36 protons, 44 neutrons, and 35 electrons? 1- 1+ 2+ 2-

1+

Bromine (used to make silver bromide, the important component of photographic film) has two naturally occurring isotopes. One has a mass of 78.918336 amu and a percent abundance of 50.69%, and the other has a mass of 80.916289 amu and a percent abundance of 49.31%. What is the average atomic mass of bromine? 78.99 amu 79.92 amu 79.51 amu 79.90 amu

79.90 amu

Strontium has four stable isotopes. Strontium-84 has a very low natural abundance, but 86Sr, 87Sr, and 88Sr are all reasonably abundant. Which of these more abundant isotopes predominates? 87Sr 88Sr 84Sr 86Sr

88Sr

The formula for table salt is NaCl. What type of chemical bond is present in NaCl? An ionic bond NaCl is a heterogeneous mixture, so there is no chemical bond between Na and Cl. A covalent bond NaCl is a homogeneous mixture, so there is no chemical bond between Na and Cl.

An ionic bond

What is the name of the compound with the formula Cl2O7? Dichlorine hexoxide Dichlorine sectoxide Dichlorine septoxide Dichlorine heptoxide

Dichlorine heptoxide

What is the name of the compound with the formula P2O5? Phosphorus pentoxide Diphosphorus pentoxide Phosphorus oxide Diphosphorus oxide

Diphosphorus pentoxide

Which of the following objects is the smallest? Electron Cell Molecule Atom

Electron

Which of the following objects is the largest? Cell Proton Liver Atom

Liver

Which of the following compounds contains covalent bonds? AlF3 N2H4 Ga2Se3 CuO

N2H4

Choose the smallest item from the following list: Lungs, Capillaries, Blood Cell, Neutron Lungs Neutron Blood Cell Capillaries

Neutron

What is the name of the compound with the formula NO3? Trinitrogen oxide Nitrogen oxide Mononitrogen trioxide Nitrogen trioxide

Nitrogen trioxide

Which of the following statements most accurately describes S8 ? S8 is a molecule and a compound. It has covalent bonds. S8 is an atom and an element. It has no bonds. S8 is a molecule and an element. It has covalent bonds. S8 is an ionic compound and has ionic bonds.

S8 is a molecule and an element. It has covalent bonds.

A neutral atom has 14 protons and a mass number of 29. Which element is it? Copper Silicon Technetium Phosphorus

Silicon

An atom contains 16 protons, 20 neutrons, and 16 electrons. Which element is it? Phosphorous Sulfur Germanium Oxygen

Sulfur

1/1 Which pair of elements would most likely form a covalent compound? Sodium and fluorine Chromium and oxygen Magnesium and nitrogen Sulfur and phosphorus

Sulfur and phosphorus

An ion of which element could contain 81 protons, 123 neutrons, and 80 electrons? Br- Br+ Tl+ Tl-

Tl+

Isotopes

Which of the following options best describes this illustration?Three hydrogen isotopes; one with zero neutrons, one with one neutron, and one with two neutrons. Ions Electrons Isotopes Atoms