Grade 12 Chemistry: Composition
A worksheet covering fundamental concepts of chemical composition, including atomic structure, isotopes, and molecular formulas, suitable for Grade 12 Chemistry students.
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Grade 12 Chemistry: Composition
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. Which subatomic particle primarily determines the chemical properties of an element?
Proton
Neutron
Electron
Nucleus
2. What is the definition of an isotope?
Atoms of the same element with different numbers of electrons.
Atoms of different elements with the same number of protons.
Atoms of the same element with different numbers of neutrons.
Atoms of different elements with the same atomic mass.
3. The is the total number of protons and neutrons in an atom's nucleus.
4. A chemical formula that shows the simplest whole-number ratio of atoms in a compound is called the formula.
5. Consider the image above. If the circle represents the atomic number of an element, and the number line represents the periodic table, what does this specific location tell you about the element?
6. Explain the difference between a molecular formula and an empirical formula, providing an example for each.
7. All atoms of a given element have the same number of neutrons.
True
False
8. The mass number is always equal to the atomic number for any given element.
True
False
Match the term on the left with its description on the right.
9. Atomic Number
a. The sum of protons and neutrons
10. Mass Number
b. Defines the element; number of protons
11. Mole
c. 6.022 x 10^23 particles
12. Label the following components of an atomic structure diagram:
