CHEMICAL CHANGES Flashcards
(25 cards)
What is a chemical change?
A chemical change is a process where substances transform into different substances with new chemical properties.
True or False: Chemical changes can be reversed easily.
False
Fill in the blank: A chemical change often involves a change in _____ and _____ properties.
energy; physical
Give an example of a chemical change.
Burning wood.
What is a reactant?
A reactant is a substance that undergoes a chemical change in a reaction.
What is a product?
A product is a substance formed as a result of a chemical reaction.
Multiple Choice: Which of the following is NOT a sign of a chemical change? A) Color change B) Temperature change C) Change in shape
C) Change in shape
What happens to the bonds in a chemical change?
The bonds between atoms are broken and new bonds are formed.
True or False: All chemical changes are accompanied by a change in energy.
True
What is the law of conservation of mass?
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
Multiple Choice: Which process is an example of a chemical change? A) Ice melting B) Iron rusting C) Water boiling
B) Iron rusting
What are indicators of a chemical change?
Indicators include color change, temperature change, gas production, and the formation of a precipitate.
Fill in the blank: A _____ is formed when two or more elements chemically combine.
compound
What is oxidation?
Oxidation is a chemical change involving the reaction of a substance with oxygen.
True or False: Chemical changes can be observed at the molecular level.
True
What is a precipitate?
A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.
Multiple Choice: Which of the following represents a chemical change? A) Dissolving sugar in water B) Baking a cake C) Melting wax
B) Baking a cake
What role do catalysts play in chemical changes?
Catalysts speed up chemical reactions without being consumed in the process.
What is the difference between a physical change and a chemical change?
A physical change alters the form of a substance but not its chemical composition, while a chemical change produces new substances.
Fill in the blank: A chemical equation represents a _____ change.
chemical
What is fermentation?
Fermentation is a chemical change where sugars are converted into alcohol or acids by microorganisms.
True or False: Chemical changes can occur in living organisms.
True
What is combustion?
Combustion is a chemical change that occurs when a substance reacts rapidly with oxygen, producing heat and light.
Multiple Choice: In a chemical reaction, the mass of the reactants is _____ the mass of the products. A) less than B) equal to C) greater than
B) equal to
