A Rock is determined to be 1.426 billion years old. How much uranium-235 remains in the rock?

Does brainy work with out Wi-Fi?

When a species must survive changes in the environment, would they want to use sexual or asexual reproduction. Explain

When fibers are found at a crime scene, they become valuable only when the forensic scientist can determine where the fiber came from. true or false?

What is the formula of nitrous acid

Why does a balloon pop when it is stepped on?

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?