Grade 11 Chemistry: Composition
A worksheet covering fundamental concepts of chemical composition for Grade 11 Chemistry students, including atomic structure, isotopes, and chemical formulas.
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Grade 11 Chemistry: Composition
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Read each question carefully and provide your best answer. Show all work for calculations.
1. Which subatomic particle primarily determines the identity of an element?
Electron
Proton
Neutron
Nucleus
2. Isotopes of an element have the same number of:
Neutrons
Electrons
Protons
Mass number
1. The atomic number of an element is equal to the number of in its nucleus.
2. The mass number of an atom is the sum of its and .
3. A chemical formula shows the of each element in a compound.
1. Describe the primary components of an atomic nucleus. How do these components contribute to the atom's overall charge and mass?
2. Explain the difference between an empirical formula and a molecular formula. Provide an example for each.
1. All atoms of a given element have the same number of neutrons.
True
False
2. The law of definite proportions states that a chemical compound always contains exactly the same proportion of elements by mass.
True
False
Match each term on the left with its definition on the right.
1. Atomic Mass
a. Atoms of the same element with different numbers of neutrons
2. Mole
b. The weighted average of the masses of an element's isotopes
3. Isotopes
c. The SI unit for amount of substance, equal to 6.022 x 10^23 particles
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