Science Benchmark Answer Key Pt 3

The chemical formula for sodium sulfate is Na2 SO4 . How many sulfur atoms are in the formula 2 4 for sodium sulfate?

1

The points labeled W and Y on the topographic map below show the campsites of two families. Each family hiked to the elevation on the map marked X. The arrows show the paths taken by both families. What was the change in elevation, to the nearest ten meters, for the family that took the steepest path to Point X?

120

A student uses a magnet to move a 0.025 kg metal ball. The magnet exerts a force of 5 N, which causes the ball to begin moving. What is the acceleration of the ball when it begins to move?

200 m/s^2

What is the mass number of a potassium (K) atom that has 20 neutrons?

39

The graph below shows distance over time. Which of these situations could be represented by this graph?

A student walks 1.5 km to a friend's house in 20 minutes. The two students then walk another 1.5 km to school in 40 minutes.

In 1838 botanist Matthias Schleiden determined that all plants are composed of cells. In 1839 anatomist Theodor Schwann proposed that all animals are composed of cells. In 1855 biologist Rudolph Virchow added to Schleiden's and Schwann's observations and proposed that all living things are composed of cells. Which statement is also part of Virchow's cell theory?

All cells arise from pre-existing cells

When people run long distances, their muscles require increased amounts of oxygen. Which system is responsible for carrying this oxygen to the muscles?

Circulatory

The diagram below shows four positions in Earth's orbit around the sun. The Northern Hemisphere experiences the beginning of spring when Earth is in —

Position 3

Some students used records from the U.S. Naval Observatory to make the table below of the percent of the moon that was visible on each night in January 2011. Based on these data, what part of the lunar cycle occurred between January 5 and January 7?

Waxing crescent moon

CaCO-heat-> CaO + CO 3 2 In the chemical reaction shown above, the products are best classified as —

two compounds

The diagram below shows a model of the movement of two tectonic plates. When the plates collide, one plate often moves below the other plate. The rising magma that can result from this type of plate movement may produce —

volcanic islands