Which of the following is the main evidence of life in the early universe?

A) photosynthetic bacteria

B) remains in amber

C) dinosaur fossils

D) rock impressions

Which is measured using a calorimeter

A hydrate of CoCl2with mass of 6.00g heated strongly. After cooling, the mass of anhydrate is 3.27g. How many grams of H2O were lost from hydrate?

Complete combustion of 7.80 g of a hydrocarbon produced 25.1 g of CO2 and 8.55 g of H2O. What is the empirical formula for the hydrocarbon? Insert subscripts as necessary

At present, cosmologists expect the universe to

What does the 2 in CO2 represent

During which two processes does a substance release energy? 1. | freezing and condensation freezing and melting evaporation and condensation evaporation and melting Submi

Lake michigan holds 1.35 x 10^15 gallons of water

N which orbitals would the valence electrons for selenium (Se) be placed? s orbital and f orbital s orbital only s orbital and p orbital d orbital only

Anne prepares a solution of copper nitrate with a concentration of 30 g/dm³. What mass of copper nitrate did she add to 100cm³ of water, in grams?

Chemists classify an element an element as a metal based on what physical properties