Section A: Answer ALL questions in this Section. Write your answers in the spaces provided. 1.
(a)
An experiment was carried out in the laboratory during a Chemistry lesson. A
drop of bromine was added to gas jar A. Immediately, another gas jar B was
placed above it as shown in the diagram below.
Comment on:
The concentration of bromine in gas jar A and gas jar B at the start of the
experiment.

Where are each of the three particles located within the atom?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.