C10L1 - Understanding Chemical Reactions

Front

Each substance written to the LEFT of the arrow in a chemical equation is a ____.

Back

reactant

Front

What is certain proof a chemical reaction has occurred?

Back

Examining the properties of the matter

Front

A change in _____ is a sign of ENERGY being used in a chemical reaction. Options: temperature, odor, color, texture

Back

temperature

Front

Which of the following is a result of a chemical reaction?

• water freezing into ice
• painting a fence
• chlorine and sodium forming salt
• ripping a piece of paper

Back

chlorine and sodium forming salt

Front

All substances _____. Options: are elements, are compounds, have a fixed composition, contain hydrogen

Back

have a fixed composition

Front

If the arrangement of atoms in a substance changes, then which of the following is true?

Back

A chemical reaction has occurred.

Front

What has happened to the hydrogen peroxide in the model?

Back

The bonds in the hydrogen peroxide molecules have broken, and it turns into water and oxygen.

Front

2H₂O_{2 --->} 2H₂O + O₂

_{What are the reactants of this equation?}

Back

hydrogen peroxide (2H₂O₂₎

Front

2H₂O_{2 -->} 2H₂O + O₂

_{What are the products of this equation?}

Back

water (2H₂O) and oxygen (O₂₎