Question

in a single replacement reaction, what happens? *
one element replaces another in a compound
a substance reacts with oxygen
two compounds form one
two elements trade places

the law stating that matter cannot be created or destroyed is the: * 5 po
law of motion
law of thermodynamics
law of gases
law of conservation of matter

the energy required to start a chemical reaction is called: * 5 points
activation energy
potential energy
thermal energy
kinetic energy

Explanation:

• First question: In a single replacement reaction, the general form is \(A + BC

ightarrow AC + B\), where one element (\(A\)) replaces another element (\(B\)) in a compound (\(BC\)). A substance reacting with oxygen is a combustion reaction. Two compounds forming one is a synthesis reaction. Two elements trading places is a double - replacement reaction.

• Second question: The law of conservation of matter (or mass) states that matter cannot be created or destroyed in a chemical reaction. The law of motion is related to forces and motion (Newton's laws). The law of thermodynamics deals with heat, work, and energy transfer. The law of gases (e.g., ideal gas law \(PV = nRT\)) is about gas behavior.
• Third question: Activation energy is the minimum energy required to start a chemical reaction. Potential energy is stored energy. Thermal energy is related to heat. Kinetic energy is the energy of motion.

Answer:

1. One element replaces another in a compound
2. Law of Conservation of Matter
3. Activation energy