What are the four classifications of matter?

of those four, which two are pure substances?

Which of the following radiation sources provides the greatest radiation dose? one year of natural background radiation one X-ray at the dentist food that has been irradiated a nuclear power plant

Which of the following masses is the largest? O 0.020 kg 0 20.0 mg O 0.200 g O 2000 ug

How many moles are represented by 250g of platinum?

An ice cube is dropped into a glass of milk at 20°C. Which statement explains the transfer of kinetic energy (KE) ? A) Because milk has higher KE than ice, KE is transferred from the milk to the molecules of ice.

If a scientist took a Geiger counter into a laboratory and measured a very high reading, this would indicate that A. uranium and no other radioactive element is present. B. ionizing radiation is present. C.

Which radioactive element is used to determine the absolute age of late pleistocene animal remains?

Compare the practical uses and limitations of nuclear fission and fusion. Include in your answer a detailed description of the two processes, comparing and contrasting them in terms of the types of atoms involved, the conditions needed to get the

Why can two igneous rocks have the same minerals but different names?

Where do the heaviest elements in our solar system come from?

Four students presented different analogies to describe the formation of an ionic bond. Student A: A tug of war between seven middle school students and a high school student Student B: A small dog and a big dog tugging at a bone with equal strength