Scelta multipla
Which of the following statements about the melting temperature of potassium chloride (KCl) is correct?
145
views
1. Intro to General Chemistry
Chemical Properties
Scelta multipla
Which of the following is an example of a chemical reaction?
A
Water freezing to form ice
B
Salt dissolving in water
C
Iron rusting when exposed to air
D
Breaking a glass into pieces
Guida verificata passo dopo passo1
Understand the definition of a chemical reaction: it involves the rearrangement of atoms to form new substances with different chemical properties.
Analyze each option to see if new substances are formed: Water freezing to form ice is a physical change because the molecular structure of H\_2O remains the same.
Salt dissolving in water is also a physical change since the salt dissociates into ions but no new chemical substances are created.
Iron rusting when exposed to air is a chemical reaction because iron reacts with oxygen and moisture to form a new compound, iron oxide (rust).
Breaking a glass into pieces is a physical change because the glass is only physically broken, not chemically altered.
Video correlati
Pratica correlata
