5.Which of the following indicates that an exothermic reaction has taken place?
A. change in color
B. release of heat and/or light energy
C. cooling of the surroundings
D. Absorption of heat by the reaction

6.Which on the following indicates that an endothermic reaction has taken place?
A. cooling of the surrounding
B. release of the heat and light energy
C. a loud explosion
D. a change in color

7. What type of reaction does the generalized equation A + B -AB represent?
A. Decomposition
B. Double Displacement
C. Single displacement
D. synthesis

8. Consider the equation CO2 - C + O2. what type of reaction is this?
A. Synthesis
B. Decomposition
C. Single Displacement
D. double displacement

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.