One difference between a chemical formula and a chemical equation is that the chemical equation shows A. abbreviations for each element.
B. the number of atoms per element.
C. what elements are in each molecule.
D. the chemical reaction that takes place.

The correct option is D.

D. the chemical reaction that takes place.

The following information should be considered:

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D. the chemical reaction that takes place.

Explanation:

The difference between a chemical formula and a chemical equation is that the chemical equation shows the reaction that takes place.

In a chemical equation, we have reactants and products on different sides of the expression.

This implies that a chemical change is taking place.

For chemical formula, they are used to represent a compound and it shows the number of atoms that are combining in a compound.

(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