There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2Br2 molecules, and the mass of a Br2Br2 molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br2Br2 consists of three peaks: Mass (amu)(amu) Relative Size 157.836 0.2569 159.834 0.4999 161.832 0.2431 What is the origin of first (mass of 157.836 amu) peak (of what isotopes does each consist)

Part of molten rock at mid-ocean ridges

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

In november 1987, a massive iceberg broke loose from the antartic ice mass and floated free in the ocean. the chunk of ice was estimated to be 98 mi long, 25 mi wide, and 750 ft thick. a typical backyard swimming pool contains about 24,000 gallons of water. how many of these pools could you fill from the water in this iceberg? (assume the iceberg is a rectangular solid of the above dimensions and consists of water only). express answer in scientific notation.