Part 2
asp if i ace this test i will get an xbox one s
pleas ! btw worth 89 points

question 15 unsaved
you are asked to determine the identity of an unknown liquid and can measure only one physical property. you heat the liquid and record that the liquid turns to vapor at 100°c. this demonstrates which physical property?

question 15 options:

boiling point

melting point

combustibility

ability to conduct electricity

question 16 (1 point) question 16 unsaved
mark places four objects in a tank of water. he makes the following observations.

· a beach ball floats.

· a penny sinks.

· a soda can floats.

· a piece of chalk sinks.

which statement is correct based on mark's observations?

question 16 options:

the penny and the chalk have a density greater than water.

the beach ball and the can of soda have a density greater than water.

the beach ball and the can of soda have a density equal to water.

small objects always sink in water.

question 17 (1 point) question 17 unsaved
pam stirred a packet of fruit punch drink mix into a pitcher of 6 cups of warm water until it dissolved. she then put in 10 ice cubes to cool down the mixture before she drank it. pam's brother nate watched her make the drink and said that two physical changes had occurred. pam thought only one had happened. who was right?

question 17 options:

pam is right. the drink mix dissolving into the drink was a physical change, but the ice melting was a chemical one.

pam was right. the ice melting was a physical change, but the drink mix caused the water to change color so it was a chemical change.

neither pam nor nate are correct since both changes were chemical changes.

nate was right. the ice cubes melted and the drink mix dissolved into the water. both are physical changes.

question 18 (1 point) question 18 unsaved
mary sue is making caramel ice cream. in the first part of the process, she combines a cup of sugar and a cup of water in a saucepan. she cooks the mixture over medium heat until the sugar melts and browns to a light amber color. then she adds the same amount of water to the mixture along with a cup and a half of cream and milk.

which part of the preparation indicated a chemical change?

question 18 options:

melting the sugar

mixing the sugar with water

adding cream and milk to the mixture

sugar changes from white to a light amber color

question 19 (1 point) question 19 unsaved
select the correct statement to describe when a sample of liquid water vaporizes into water vapor.

question 19 options:

temperature decreases and molecular motion decreases while shape becomes more defined.

temperature increases and molecular motion decreases while shape becomes more defined.

temperature decreases and molecular motion increases while shape becomes less defined.

temperature increases and molecular motion increases while shape becomes less defined.

question 20 (1 point) question 20 unsaved
the volume of water in a beaker was 315 ml. after 7 days, the volume of the water was 300 ml. kayla says that a chemical change occurred, but maria says it was a physical change. who is correct?

question 20 options:

maria is right. the water in the beaker changed from a liquid to a gas when it evaporated. changing states of matter is a physical change.

both kayla and maria are correct. the water changed states which is a physical change, but it also changed into a new substance which is a chemical change.

neither kayla nor maria are correct since the water just evaporated. no change took place.

kayla is right. the water changed from a water to a gas. a gas is a new and different substance. this is a chemical change.