Chemistry Quiz: Isotopes & Periodic Table

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Questions and Answers

How many neutrons are present in an atom of silver represented by the symbol $^{107}Ag$?

60 (correct)

What determines the average atomic mass reported on the periodic table?

The atomic mass of the most common isotope

A weighted average of stable isotopes (correct)

The mass of neutrons in the element only

The sum of all isotopic masses

Which of the following statements is correct regarding isotopes?

Isotopes have the same number of protons but different masses. (correct)

Isotopes of an element have the same number of neutrons.

All isotopes are stable and contribute equally to average atomic mass.

Isotopes differ in their chemical properties due to neutron differences.

Which formula correctly expresses the calculation for average atomic mass?

$m_{average} = ext{sum of } (m_i imes A_i)$ (C) Signup and view all the answers

Which of the following elements is isotopically represented by the given mass data: 91.9 amu, 93.9 amu, 94.9 amu with respective abundances?

Molybdenum (D) Signup and view all the answers

What is the molecular mass of silver nitrate (AgNO3)?

169.87 g/mol (A) Signup and view all the answers

If 10 g of silver nitrate is formed, how many moles of silver nitrate does this correspond to?

0.059 mol (C) Signup and view all the answers

How much silver (in grams) is in 10 g of silver nitrate based on its composition?

5.77 g (A) Signup and view all the answers

What is the cost to replace the lost silver, if 1 gram costs 1.29 CAD?

7.23 CAD (C) Signup and view all the answers

If you have 1 mole of silver atoms, how many atoms does it contain?

6.022 × 10^23 (A) Signup and view all the answers

Which of the following elements would be classified as a non-metal?

Oxygen (D) Signup and view all the answers

What aspect can be determined by measuring the 13C to 12C ratio in honey?

The purity of the honey (B) Signup and view all the answers

Which category of elements is primarily involved in the formation of ionic compounds?

Main Group Metals (D) Signup and view all the answers

Which of the following properties is NOT directly related to an atom's atomic radius?

Atomic mass (A) Signup and view all the answers

In the context of the periodic table, which trend is observed as you move from left to right across a period?

Increasing electronegativity (B) Signup and view all the answers

What is the significance of ionic charge in atomic interactions?

It affects the formation of chemical bonds. (B) Signup and view all the answers

Which group of elements are characterized by having similar chemical properties?

All of the above (D) Signup and view all the answers

Which of the following elements would be classified as a metalloid?

Silicon (B) Signup and view all the answers

What is the charge on hydrogen ions?

1+ (C) Signup and view all the answers

In a one-liter soft drink containing 0.001 M of hydrogen ions, how many moles of hydrogen ions are present?

0.001 moles (C) Signup and view all the answers

What is the atomic mass of the cations with an atomic mass of 39 amu and 41 amu respectively?

39.5 amu (B) Signup and view all the answers

What is the result of a molar ratio larger than 0.01096 in honey?

Doped honey (D) Signup and view all the answers

How many electrons are in each hydrogen ion?

0 electrons (C) Signup and view all the answers

What does a cation with a charge of 1+ signify?

It has lost one electron (C) Signup and view all the answers

Which of the following compounds has an anion with electrons equal to the cation's protons?

NaCl (B) Signup and view all the answers

What indicates that there are isotopes in the sample of cations?

Different atomic masses (B) Signup and view all the answers

Which characteristic is generally shared by elements within the same group?

Chemical and physical properties (C) Signup and view all the answers

What property does the period number correspond to in the periodic table?

The principal quantum number for electronic orbitals (A) Signup and view all the answers

Which of the following properties typically increases as you move down a group in the periodic table?

Electrical conductivity (B) Signup and view all the answers

An element that acts as a non-metal in the second period can be identified as which of the following?

Oxygen (D) Signup and view all the answers

Which of the following elements belongs to Group 1 in the periodic table?

Sodium (B) Signup and view all the answers

What does the upper left number in an elemental symbol represent?

Mass number (A) Signup and view all the answers

Which of the following elements is a gas at 0 °C and 1 bar pressure?

Hydrogen (C) Signup and view all the answers

What is represented by the lower right number in an elemental symbol?

Number of atoms (C) Signup and view all the answers

Which statement about isotopes is correct?

Isotopes behave the same chemically. (A) Signup and view all the answers

In which group would you find elements that typically exhibit metallic character?

Group 13 (D) Signup and view all the answers

Study Notes

Verifying Food Quality: Carbon Isotopes of Honey

Honey is a valuable product, but some manufacturers dilute it with cheaper sugars to increase profits.
The ratio of carbon-13 to carbon-12 isotopes in honey is different from other sugars.
By measuring this ratio, we can determine if a honey sample is pure.

Navigating the Periodic Table – Regions

The periodic table is organized by atomic number.
Elements are frequently grouped into four regions: main group metals, transition metals, metalloids, and nonmetals.
These categories are defined by similar chemical properties.

Navigating the Periodic Table – Groups

Elements within a group share similar chemical and physical properties, including: electron configuration, electronegativity, ionization energy, ionic charge, and electical conductivity.

Navigating the Periodic Table – Periods

The period number corresponds to the principle quantum number of the electronic orbitals of its atoms.
Elements in each successive period tend to exhibit more metallic character, this is especially important for groups 13 through 16.

Elemental Symbols

Elemental symbols can include additional information, indicated by numbers in specific locations.
Upper left: mass number (mi), total number of protons and neutrons in an atom.
Upper right: Ionic charge (q), net electric charge on an atom.
Lower left: Atomic number (Z), equal to the number of protons in an atom.
Lower right: Number of atoms (N), number of atoms in a molecule or formula.

Identifying Isotopes

The atomic number identifies an element and therefore the number of protons.
The mass number is equal to the sum of protons and neutrons.
Number of neutrons in an atom can be determined by subtracting the atomic number (protons) from the mass number.

Isotopic Abundance and Average Atomic Mass

The atomic mass found on the periodic table is the weighted average of the masses for each stable isotope.
The atomic mass (amu) is equivalent to the number of grams in a single mole of that element (1 amu = 1 g/mol).
This average weight is calculated by taking the average of each isotope's mass, multiplied by their relative abundance.
Average atomic mass = ∑ (mass of isotope * relative abundance of isotope) for all isotopes.

Quantifying Matter – The Mole

The amount of a substance (n) is quantified in moles (mol), where 1 mole = 6.022 x 10^23 somethings.
These "somethings" can be atoms, molecules, or other particles.
Avogadro's number (NA) is 6.022 x 10^23 mol−1.
The amount of substance (in moles) is equal to its mass (m) divided by its molecular mass (M): n (mol) = m (g)/M (g/mol)

Molar Mass

The molecular mass (M) is the sum of the atomic masses of all the atoms in a molecule.
To calculate the mass of a substance given the number of moles, multiply the number of moles by the molecular mass.
To calculate the number of moles of a substance given the mass, divide the mass by the molecular mass.

Knowledge Development Questions

The ratio of carbon-13 to carbon-12 isotopes is used to determine the purity of honey.
The carbon-13 to carbon-12 isotope ratio in doped honey is larger than the ratio in pure honey.
To determine the number of electrons in an anion, add the number of protons for the element to the negative charge.
To find the average atomic mass of an element, take the weighted average of all isotopes, accounting for their relative abundance.
The average atomic mass of a cation is equal to the average atomic mass of the element.
To determine the number of electrons in a cation, subtract the positive charge from the number of protons for the neutral element.

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Description

This quiz covers two main topics in chemistry: verifying food quality using carbon isotopes in honey, and understanding the organization of the periodic table. You will learn how isotope ratios can indicate honey purity and explore the characteristics of various element regions, groups, and periods. Test your knowledge on these essential concepts in chemistry!