Answer:
D) 2H₂O → 2H₂ + O₂
Explanation:
Decomposition means water molecules break up into hydrogen and oxygen molecules.
H₂O → H₂ + O₂
We need to balance the equation. There's one O atom on the left, and two O atoms on the right. Put a 2 in front of H₂O.
2H₂O → H₂ + O₂
Now there's 4 H atoms on the left, and 2 H atoms on the right. Put a 2 in front of H₂.
2H₂O → 2H₂ + O₂
The equation is balanced. There are 4 H atoms and 2 O atoms on either side.
Answer:
radio waves
Explanation:
Radio waves are used for communication such as television and radio. Radio waves are transmitted easily through air. They do not cause damage if absorbed by the human body, and they can be reflected to change their direction. These properties make them ideal for communications.
Answer:
-0.209 kg.m/s
Explanation:
The mass of the ball, m = 275g or 0.275 kg
Speed or velocity, v = 2.60 m/s
Momentum, P = mv
Momentum when velocity is 2.60 = 0.275 x 2.60 = 0.715 kg.m/s
Speed or velocity, v = 1.84 m/s
Momentum, P = mv
Momentum when velocity is 1.84= 0.275 x 1.84 = 0.506 kg.m/s
Change in magnitude = 0.506 - 0.715 = -0.209 kg.m/s
A tough, lightweight, elastic synthetic polymer with a protein-like chemical structure, able to be produced as filaments, sheets, or molded objects.
Answer:
A car is accelerating whenever there is a change in its state of motion. Acceleration also applies to changes in direction. It is important to distinguish between speed and velocity. Acceleration is defined as the rate of change in velocity, rather than speed.