Question

select the correct answer. samuel adds a teaspoon of salt to a glass of water. he notices that the salt disappears. samuel takes a sip to discover that the water tastes salty. what kind of change has occurred? a. its a chemical reaction because a new substance has formed. b. its a physical change because the water and the salt kept their original properties. c. its an example of synthesis because two substances reacted to give one substance. d. its a chemical reaction because the water now tastes salty but originally did not.

Explanation:

When salt is added to water, it dissolves. This is a physical change as the salt and water retain their chemical identities. No new substance is formed chemically; the salt just breaks into ions and disperses in water. In a chemical reaction, a new substance with different chemical properties is formed. Synthesis is a type of chemical reaction where two or more substances combine to form a new compound. Since the salt - water mixture doesn't meet these criteria for chemical change or synthesis, it's a physical change.

Answer:

B. It's a physical change because the water and the salt kept their original properties.