Which statement is a hypothesis these students might be using in their experiment?

A this experiment tests how the speed of a toy car changes with the steepest of the ramp .

B it’s fun to see how fast the cars roll down the steepest ramp.

C if a toy car is down ramps of different steepest it will roll fastest on the steepest ramp .

D will a toy car roll faster down a steeper ramp ?

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

yes

explanation:

search chemistry final b exam in google and a site called quizlet will pop up

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.