Myra puts kernels of wheat in a grinder and grinds them into flour. She then adds salt,
baking soda, sugar, and dry yeast and mixes them together. (Yeast is a live organism
that lives off of simple sugars and gives off carbon dioxide gas as it eats the sugars.)
Next, she adds water, milk, and oil. She kneads the mixture to form dough. She lets the
dough rise until it doubles in size. Then, she punches it down, forms a loaf, and places it
in a bread pan. She lets it rise again, and then she bakes it in the oven.

Which of the following steps involves a chemical change?

A)She lets the dough rise until it doubles in size.

B)She adds salt, baking soda, sugar, and dry yeast to the flour and mixes them together.

C)Myra puts kernels of wheat in a grinder and grinds them into flour.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

the answer is 0.8m.

by: nicholas

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied