Earth and the Solar System: Phenomena: Question 3
How old is our solar system?
Select one:

1. About 13.5 million years.

2. About 13.5 billion years.

3. About 4.5 million years.

4. About 4.5 billion years.

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

Which statement can best be concluded from the ideal gas law?

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?