Question

3
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.
reset next

Explanation:

• A physical change is a change in which no new substances are formed. In this case, when salt is dissolved in water, it is still salt (the taste is salty) and water. The salt has just dispersed in the water.
• A chemical reaction would involve the formation of a new substance with different chemical properties. Here, no new chemical substance is formed.
• Synthesis is a type of chemical reaction where two or more substances combine to form a new substance. This is not the case here as no new substance is formed.

Answer:

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