Stone tools enabled people to hunt and grow crops made the food supply more

What is one element in the same family as oxygen?

If the hydrogen ion concentration of a solution is 10-10m the solution is

What is the best explanation of why it was important that Becquerel used a uranium salt in his experiments? Uranium salts are solid at room temperature. Uranium atoms are found in photographic plates. Uranium atoms are radioisotopes.

A match has about 21 milligrams of red phosphorus coating the tip. How many atoms of phosphorus is this?

A reaction showing heat as a product is an exothermic reaction. TRUE FALSE

What concentration of the lead ion, pb2+, must be exceeded to precipitate pbf2 from a solution that is 1.00*10-2 m in the fluoride ion, f-? ksp for lead (ii) fluoride is 3.3*10-8?

Calculate the temperatureoC that 0.2 moles of gas in a balloon at 2.0 atmoccupies 2.0 L.

How does the molecular count support the idea of a nucleotide as a subunit

Explain how will you know the mass of the water in your experiment?

Convert 5 moles H2O to liters