Flashcardizz S4 T9 L1 & 2 Chemical Change & Conservation of Mass

Front

What type of reactions usually feel hot?

Back

Exothermic reactions release heat.

Front

What is the term for the number before a chemical formula?

Back

Coefficient.

Front

What is the chemical formula for water?

Back

Front

What always happens in a chemical change?

Back

A change in the way atoms are bonded to each other.

Front

Is the equation Al + O₂ ---> 2Al₂O₃ balanced?

Back

No.

Front

What is a chemical change?

Back

A process where substances transform into different substances with new properties.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is an endothermic reaction?

Back

A reaction that absorbs heat from its surroundings.

Front

What is a subscript in a chemical formula?

Back

A number that indicates the number of atoms of an element in a molecule.

Front

What does a balanced chemical equation represent?

Back

It shows that the number of atoms for each element is the same on both sides of the equation.