The three basic crystal structures are called Hexagonal Close Packed (HCP), Face Centered Cubic (FCC) and Body Centered Cubic (BCC).Shown below are alternative representations of the structures in Figure 1.The order in which they are represented is:

When the thermometer was in the 40°C water, in the time interval between 0 sec and 2 sec, approximately how rapidly, in °C/sec, was the temperature registered by the thermometer changing?

The instrument shown is used to study:

Suppose scientists discover a new echinoderm that uses its tube feet to move across the deep-sea floor as it hunts for prey. This newly discovered echinoderm can most likely be classified as a(n):

A pantograph is a four-bar linkage mechanism used for drawing. It consists of two long bars and two short bars pivoted to one another so that they can move freely in the plane. In the version shown in Figure 3 below the short bars are half the lengths of the long ones.The point O is held fixed. There is a pointer at X and a pencil at Y. As the pointer at X is traced over a shape, the pencil at Y draws the shape enlarged by a factor of two.In Figure 3 if O and Q are both held fixed, the point Y.

An ideal gas is a hypothetical gas whose pressure - volume - temperature behavior can be completely accounted for by the ideal gas equation (General gas equation). The molecules of an ideal gas do not attract or repel one another, and their volume is negligible compared with the volume of the container. Experiments show that under the STP conditions, one mole of an ideal gas occupies a volume of 22.4dm3.A tin can is sealed at a pressure of 100mmHg. If the can is taken to STP, the can may:

It is generally well known that on average we are taller than our ancestor; this is true of people in various places around the world.The people of the Netherlands, now the world's tallest, have been on an upward trend since 1851, though the rate of growth accelerated after the second world war. In 1965, the average Dutchman was 1.78m tall. By 1997, he was 6cm taller. The average Dutch woman grew from 1.66m to 1.71m.The Spanish grew 2.4cm per decade between 1960 and 1990. In Western Europe this growth has now slowed to about 1cm per decade but Western Europe and Japan are increasing by up to 3cm per decade. However, on average, women are increasing in height more slowly than men so the gap in height between the sexes is widening.It has been found that it is the first two years of life which are the most important for height, when the leg bones are growing rapidly. Not only increased food supply but also general health improvement brought about antibiotics and vaccinations have had an effect. Your final height, however, is still dependent on the height of your parents and grandparents.Between 1960 and 1990 the average height of a Spaniard increased overall by about