Question 1

A student is studying calcium, a highly reactive element that humans need for strong bones.  Which characteristic of calcium is most closely related to its chemical reactivity?

Accepted Answer

the 2 valence electrons in each atom of calcium

Answer

the atomic mass of calcium, which is 40.078 amu

Answer

the density of calcium, which is 1.54 $g/cm^3$

Answer

the 20 protons in each atom of calcium

Question 2

A model of a beryllium atom is shown.  What types of particles are found in the cloud surrounding the atom's nucleus?

Accepted Answer

negatively charged particles only

Answer

positively charged particles only

Answer

neutral particles and positively charged particles

Answer

positively charged particles and negatively charged particles

Question 3

A student draws the model shown.  Which of these compares the conditions at Location X and Location Y?

Accepted Answer

There are more hours of daylight at Location X than at Location Y.

Answer

The moon is brighter when viewed from Location X than when viewed from Location Y.

Answer

It is winter at Location X and summer and Location Y.

Answer

It is day at Location X and night at Location Y.

Question 4

Based on its chemical formula, which of the following substances is an organic compound?

Accepted Answer

urea, $CH_4N_2O$

Answer

ammonium sulfide, $(NH_4)_2S$

Answer

silane, $SiH_4$

Answer

sodium chloride, $NaCl$

Question 5

Which of these situations could be represented by this graph?

Accepted Answer

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.

Answer

A student walks 1.5 km to a friend's house in 30 minutes.  The two students then walk another 1.5 km to school in 30 minutes.

Answer

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 60 minutes.

Answer

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

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