CHemical Reactions Flashcards
(16 cards)
What are signs of a chemical reaction?
Signs of a chemical reaction can include bubbles, a colour change, and a large energy change.
What do bubbles indicate in a chemical reaction?
Bubbles indicate the production of a gas during a chemical reaction.
What does a colour change signify in a chemical reaction?
A colour change signifies that new chemicals are formed that differ in colour from the original substances.
What does a large energy change indicate in a chemical reaction?
A large energy change indicates that a reaction is occurring, either releasing or absorbing energy.
What is required for a chemical reaction to take place?
A new substance must be produced for a chemical reaction to take place.
Why do bubbles in boiling water not indicate a chemical reaction?
Bubbles in boiling water are steam and do not indicate a new substance has formed, as steam condenses back into liquid water.
How are chemical reactions used in everyday life?
Chemical reactions are used to make useful new chemicals, heat homes, power cars, and cook food.
What happens when vinegar and baking soda are mixed?
A reaction occurs, producing bubbles of carbon dioxide gas.
What is the chemical name for vinegar?
The chemical name for vinegar is ethanoic acid.
What is sodium bicarbonate commonly known as?
Sodium bicarbonate is commonly known as baking soda.
What is the first step in the vinegar and baking soda reaction experiment?
The first step is to light a candle.
What happens when carbon dioxide is poured onto a flame?
The carbon dioxide displaces the oxygen fueling the flame and puts it out.
What occurs during a chemical reaction at the particle level?
Chemical bonds between atoms are broken and made, rearranging atoms into new substances.
What is formed when two elements react together?
A compound is formed when two elements react together.
What is a sulfide?
A sulfide is a chemical compound containing the element sulfur.
What happens to the total number of atoms during a chemical reaction?
The total number of atoms remains the same during a chemical reaction.
