Basic Concepts of Chemistry

A ___ is a substance formed when two or more elements are chemically bonded together.

• Element

• Compound

• Mixture

• Solution

Starting with 300 grams of reactants, the total mass of products after the reaction should be _____ g, demonstrating the conservation of mass principle.

• 250 grams

• 300 grams

• 350 grams

• 400 grams

Identify the total number of atoms, elements, and molecules in the chemical formula: 5CaCO₃.

• 5 molecules, 3 elements, 25 atoms

• 5 molecules, 3 elements, 20 atoms

• 5 molecules, 4 elements, 25 atoms

• 5 molecules, 3 elements, 30 atoms

Determine whether the chemical equation is balanced or unbalanced. Show your work: @@4FeS + 7O_2 \rightarrow 2Fe_2O_3 + 4SO_2@@

• Balanced

• Unbalanced

• Partially Balanced

• Cannot be Determined

Products in the chemical equation

• Ethanol

• Methanol

• Acetic Acid

• Butanol

Arrow in a chemical equation

• Indicates the direction of the reaction, showing the conversion of reactants to products.

• Represents the physical state of the reactants and products.

• Shows the temperature at which the reaction occurs.

• Indicates the presence of a catalyst in the reaction.

Chemical equation

• A representation of a chemical reaction using symbols and formulas.

• A type of chemical bond between atoms.

• A method for measuring the concentration of a solution.

• A process of combining different substances to create a new one.

Formation of gas

• Bubbles forming when vinegar is mixed with baking soda.

• Steam rising from boiling water.

• Air escaping from a punctured tire.

• Carbon dioxide released from a soda can.

Reactants in a chemical equation

• Substances that undergo a chemical change.

• Products formed after a reaction.

• Catalysts that speed up the reaction.

• Inert substances that do not react.

Reactants in the chemical equation

• Ethylene and water

• Propylene and ethanol

• Acetylene and oxygen

• Methane and carbon dioxide