Rain occurs after water has evaporated from the Earth's surface. Which of these is the main source of water on the Earth's surface?

Matter is everywhere around us. Make a list by nameof fifteen different kinds of matter that you encounter every day.

Tin reacts with nitric acid according to the following equation. What substance is the reducing agent? Sn (s) + 4HNO3 (aq) → SnO2 (s) + 4NO2 (g) + 2H2O (g)

The Living Planet Index (LPI), which measures trends in thousands of vertebrate species populations, show between 1970 and 2010. Terrestrial species declined by 39% between 1970 and 2010, a trend that shows down.

How many unpaired electrons does oxygen have?

What imformation does the pH of solution give?

How did coroners handle their responsibilities in the early 1900s? Why was there a need for significant change in the job?

Which of the following is the best indication that a chemical change has taken place? a. The matter changes color. b. A mixture separates into layers. c. The change is reversible. d. The shape of the substance changes.

This is not lost in a chemical Reaction (4 letter word second letter is A)

Which type of soil holds the least water

Eq-43 which type of fire extinguisher should be onboard a vessel with a permanently installed fuel tank