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4A physical change alters the composition of a substance.
Chemical change cannot be reversed directly to its original state.
Reactants are written on the right side of a chemical equation.
Products are formed after a chemical reaction.
A word equation uses chemical symbols and formulae only.
A balanced chemical equation has equal number of atoms on both sides.
The unbalanced chemical equation is called a skeletal equation.
Combination of atoms can occur during a chemical reaction.
In Zn + 2HCl → ZnCl₂ + H₂, hydrogen gas is a reactant.
Chemical equations are symbolic representations of reactions.
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A change that does not alter composition is called:
The substances formed after a reaction are called:
Which symbol separates reactants and products?
Which of the following is a word equation?
Which equation is balanced?
Heating calcium carbonate produces:
The reaction Zn + 2HCl → ZnCl₂ + H₂ is an example of:
In N₂ + 3H₂ → 2NH₃, the product is:
Equal number of atoms on both sides shows:
Exchange of atoms occurs in:
Substances formed at the end of a chemical reaction are called ______
Substances that take part in a chemical reaction are called ______.
The number of atoms of every element on both sides of a balanced chemical equation must be ______
The chemical formula of ammonia is ______