During the hot summer days, there is a lot more water in the air. This is due to which change of state?

A temperature of 20 degrees C is equivalent to approximately

In a redox reaction, one of the reactants must release a. H + ions b. OH - ions c. electrons d. gas

What does it mean to "simplify" the equation? conclusion:

Do wind up clocks need batteries? - like the non wired ones.

Butene is an alkene explain how you know

What shape is the magnetic field produced when current is passed through a wire? a. Parabolic b. Elliptical c. Circular d. Bimodal

What year was the hole in the ozone layer detect in the antarctica?

Sodium (NA) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have? A) 0 B) 1 C) 9 D) 11

Which of the following is not caused by the moon? a. moonrise b. tides c. eclipses d. sunrise

Approximately how many mineral species have scientists identified? 250 5000 1500 60