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

A polyatiomc ion is? A. a charged covalent bond B. an ionic bond C. a metallic bond D. used in covalent bonds

Letter flipper on a game show. Periodic table pun

Many trials are not needed before a hypothesis can be accepted

Do atoms bond in such a way as to produce electron configuration of a noble gas

Which of the following best describes the relationship between the Earth and the sun? (A The Earth gets no light from the sun, and is illuminated by the moon. B When it's night time, your part of the Earth is facing away from the sun.

The density of HCN (hydrogen cyanide) gas at STP is 1.21g/L. What volume will 100.0g of HCN occupy at STP? A) 121 L B) 0.012 L C) 82.6 L D) none of the above

A 20.0 ml sample of 0.150 m ethylamine is titrated with 0.0981 m hcl. what is the ph after the addition of 5.0 ml of hcl? for ethylamine, pkb = 3.25

Some polymers are elastic because they are made of a. carbon. c. sugar and alcohol. b. phosphate ladders. d. cross-linked chains.

The hot converting blank is the layer of rock between the earths crust and core

Compare the compressibility of gases and liquids. Support your answer by describing the arrangement of particles in gases and liquids.