If 25% of a radioactive element remains after 1,000 years, what is the half-life?

Name two geological resources

Which element is the most reactive? sodium, nickel, carbon, or oxygen

When a toaster in use electrical energy is transformed into

If 1.0g of rubidium and 1.0 g of bromine are reacted what will be left in measurable amounts in the reaction

A piece of wood has a volume of 30 cm³. It has a length of 2 cm and a width of 3 cm. What is the height of the wood? 5 cm 6 cm 15 cm 60 cm

Which set of procedures and observations indicates a chemical change? A) Ethanol is added to an empty beaker and the ethanol eventually disappears. B) A solid is gently heated in a crucible and the solid slowly turns to liquid.

If 100 grams citric acid react with 100 g baking soda how many grams of carbon dioxide?

What state of matter undergoes changes in volume most easily? a. solidb. liquidc. gasd. frozen

What was the result of the atomic theory?

Explain mitosis and meiosis in your own words.