Exam 1: A Very Brief History of Chemistry

A naturally occurring element consists of three isotopes. The data for the isotopes are: Isotope 1: 147.9554 u, 10.563% Isotope 2: 150.9496 u, 70.811% Isotope 3: 152.9461 u, 18.626% What is the average atomic mass of this naturally occurring element?

Which of the following have opposite electric charges?

The atomic mass of naturally occurring iron, which is a mixture of isotopes, is listed as . This means that the average mass of iron is

Which one of the statements below is true?

In stars the heaviest elements migrate to the outer layers of the star due to centrifugal forces.

Chemistry has four main ideas that were given in chapter 0. List them.

The relative number of atoms of each element in a particular compound

Which subatomic particle has a positive charge?

A naturally occurring element consists of two isotopes. Calculate the average atomic mass and identify the element, based on the data below. Isotope 1: 10.013 u 19.78 % Isotope 2: 11.009 u ------% ,Hint: Percentages should always add up to 100% then find the weighted average.

How many electrons are in an atom of ³⁵Cl?

When a piece of paper burns in a closed container, the combined masses of the products is less than the mass of the original piece of paper.

A compound of hydrogen and sulfur contains 2.69 grams of hydrogen and 47.31 grams of sulfur. Another sample of the same compound that contains 75.63 grams of sulfur would contain how many grams of hydrogen? Hint: Consider the ratio of the masses to determine the mass of hydrogen

Stars that are classified as red giants are formed after the outer layer of hydrogen in a star cools and is no longer white hot.

An atom of the isotope sulfur-33 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron)

The particles found in nuclei, the protons and neutrons, are collectively called ________.

According to recent IUPAC recommendations, a range of atomic masses should be used instead a single value.

Molecular self-assembly occurs when two atoms can spontaneously arrange themselves into creating a diatomic molecular structure.

Consider the atoms of ⁵⁹Co and ⁶⁰Co. Both of these atoms have the same

Which of the following is the logical progression of elements formed in a star?

A naturally occurring element consists of three isotopes. The data for the isotopes are: Isotope 1: 46.972 u, 69.472% Isotope 2: 48.961 u, 21.667% Isotope 3: 49.954 u, 8.8610% What is the average atomic mass of this naturally occurring element?