Question

on a smooth plane mirror, if the angle of incidence is 30°, then the angle of reflection is 30° 60°. 90° 15° incandescent lighting is much more energy - efficient than fluorescent lighting. true false what type of chemical reaction begins with a single reactant and produces several products? decomposition single replacement synthesis double replacement

Explanation:

Step1: Recall the law of reflection

According to the law of reflection, the angle of incidence is equal to the angle of reflection. Given the angle of incidence is \(30^{\circ}\), so the angle of reflection is also \(30^{\circ}\).

Step2: Analyze the energy - efficiency of incandescent and fluorescent lighting

Incandescent lighting produces light by heating a filament, and a large amount of energy is wasted as heat. Fluorescent lighting uses less energy to produce the same amount of light. So, incandescent lighting is not more energy - efficient than fluorescent lighting.

Step3: Recall the definition of chemical reactions

A decomposition reaction is a reaction in which a single reactant breaks down into two or more products. A single - replacement reaction is \(A + BC
ightarrow AC + B\), a synthesis reaction is \(A + B
ightarrow AB\), and a double - replacement reaction is \(AB+CD
ightarrow AD + CB\)

Answer:

1. \(30^{\circ}\)
2. False
3. decomposition