Hydrogen gas and oxygen gas react to form liquid hydrogen peroxide. Which statement is true about the reaction? A.
The same atoms are present, so the chemical properties remain the same.
B.
The product that is formed has the same physical properties as the reactants.
C.
The two gases mix together, but a new substance does not form.
D.
The atoms of the reactants combine to form a new substance.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?