A radioactive material has a count rate of 1600 counts per minute. It has a half life of 20 minutes. How long will it take to decay to a rate of 100 counts per minute?

21. Archaea are also called: a. Peptidophiles b. Lipidophiles c. Resistophiles d. Reservophiles e. Extremophiles

a compound of general formula qr contains no hydrogen, q is the alkali metal of lowest atomic mass, and r contains the elements oxygen and carbon in a 3:1 ratio. write the name and the formula of the compound

Which describes gneiss? igneous formed from shells tends to split along bands grains randomly arranged

The iceman known as Otzi was discovered on a mountain on the Austrian-Italian border. Samples of his hair and bones had carbon-14 activity that was about 12.5% of that present in new hair or bone.

What is a material that cannot be broken down into anything simpler by chemical reaction?

Name 5 types of alloys

What is the 3 types of matters

A sunflower turns its head toward sunlight. What triggers this behavior in a sunflower? gravity phototropism presence of nutrients presence of water

Enter your answer in the provided box. A sample of an unknown gas effuses in 14.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.42 min. What is the molar mass of the unknown gas

What volume will 0.710 moles of nitrogen gas occupy at STP?