This chemical equation represents a chemical reaction. CaCO3 + 2HCl → CO2 + CaCl2 + H20
Which chemical is a reactant in this reaction?
A. CaCl2
B. H20
C. HCI
D. CO2
SUBMIT

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s