Samarium-146 has a half-life of 103.5 million years. After 1.035 billion years, how much samarium-146 will remain from a 205-g sample?

0.200 g

0.400 g

20.5 g

103 g

Which of the following units can be used to measure the mass of a grain of salt? A. milliliters B. milliseconds C. millimeters D. milligrams

What are some positive and negative effects of the production of maple syrup on society and the environment?

This phase of water is invisible

What is chromatography? Where is this method used in our lives.

Which of the following steps in a star's life cycle takes the longest? A. fusion of carbon atoms B. formation of a protostar C. fusion of hydrogen atoms D. fusion of helium atoms

As transformações estão presente em nosso cotidiano, elas nunca param de acontecer, na sua maioria invisível a olho nu. Quais critérios é preciso observar para identificar se ocorreu transformação?

U human ear is measured in?

Is the earth older than any of the rock layers.

Problem page liquid hexane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. what is the theoretical yield of water formed from the reaction of of hexane and of oxygen gas?

Calculate the mass percent of a NaCl solution in which 140g of NaCl is dissolved in 4.50L of water at 25C (density = 0.997g/mL).