Chemical Changes Flashcards
(26 cards)
What is a chemical change?
A process where substances transform into different substances with distinct properties.
True or False: A chemical change can be easily reversed.
False
Fill in the blank: A chemical change often involves the formation of _____ or _____.
new substances, gas
What is the primary indicator of a chemical change?
The production of gas, color change, temperature change, or precipitate formation.
Which element is commonly involved in combustion reactions?
Oxygen (O)
What happens to the atomic structure of elements during a chemical change?
The bonds between atoms are broken and new bonds are formed.
True or False: Dissolving salt in water is a chemical change.
False
Which of the following is a sign of a chemical change? A) Melting B) Rusting C) Boiling
B) Rusting
What type of reaction occurs when an acid reacts with a base?
Neutralization reaction
Fill in the blank: The law of conservation of mass states that mass is neither _____ nor _____ in a chemical reaction.
created, destroyed
Which element is essential for cellular respiration?
Oxygen (O)
What is a precipitate?
An insoluble solid that forms during a chemical reaction in a solution.
True or False: Photosynthesis is an example of a chemical change.
True
What is the chemical formula for water?
H2O
Which element is produced when hydrogen burns in oxygen?
Water (H2O)
What type of chemical reaction is represented by the equation: 2H2 + O2 → 2H2O?
Synthesis reaction
Fill in the blank: The process of rusting involves the reaction of iron with _____ and _____ to form rust.
oxygen, water
What is an example of a decomposition reaction?
The breakdown of hydrogen peroxide into water and oxygen.
True or False: Chemical changes can affect the physical state of a substance.
True
What is an endothermic reaction?
A reaction that absorbs energy from its surroundings.
What is an exothermic reaction?
A reaction that releases energy in the form of heat or light.
Which element is commonly associated with the process of fermentation?
Carbon (C)
What is the term for a chemical reaction that occurs in the presence of light?
Photochemical reaction
Fill in the blank: The _____ scale measures the acidity or basicity of a solution.
pH
