The length of an earth year is based on earths?

1. Summarize How did the work of scientists who studied fossils support the theory of evolution?

A scientist measures the pH of some rainwater and finds that it is acidic. Which pH corresponds with the acidic quality of the rainwater? A. 6 B. 7 C. 8 D. 9

In the nitrogen cycle, bacteria combine nitrogen gas with hydrogen to form ammonia in a process called

The tarnish that forms on objects made of silver is solid silver sulfide; it can be removed by reacting it with aluminum metal to produce silver metal and solid aluminum sulfide.

Identify the precipitate (s) of the reaction that occurs when a silver nitrate solution is mixed with a sodium chloride solution. check all that apply.

Which of the following statements are correct about the chemical reaction? H2 + O2 - > H2O2 versus 2 H2 + O2 - > 2 H2O? They are both balanced chemical equations. The two reactions are equivalent. The laws of thermodynamics apply to both.

What do chemists use to describe a chemical reaction

When you drop a sugar cube in a glass of water, at first the water doesn't taste sweet. Later, it tastes very sweet. Eventually, the water will taste equally sweet throughout. What term explains molecule movement to maintain a balance?

Using density what is the mass in grams of 150mL of a liquid with a density of 1.4 g/mL

All of the following can be recycled except clothing aluminum cans compact fluorescent bulbs plastic drink bottles