A student is preparing to bake a cake at home and places several ingredients on the countertop to use. First he preheats the oven to 175C, then mixes all of the ingredients together. He pours all of the cake batter into 2 pans and bakes for 1 hour. The cake layers are allowed to cool for 15 minutes. Which of the following indicates that a chemical change occurred?

The chemical change while baking a cake takes place whenever there is a formation of new substance due to either mixing or cooling.

Given data:

The procedure followed by the student to bake the cake is given.

To find:

The step at which the chemical change takes place.

When the cake is baked, then the cake batter will indicate that chemical change has occurred here.  

Thus, we can conclude that the chemical change while baking a cake takes place whenever there is a formation of new substance due to either mixing or cooling.

Learn more about the chemical change here:

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baking the cake batter

Explanation:

Baking the cake batter will indicate that chemical change has occurred here. What is a chemical change?

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the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s