K12 chemistry unit assessment: chemical bonding,

electrostatic forces in ionic bonds hold which of the following together? 1. He atoms in helium gas 2. Na + and Br - in NaBr 3. Fe atoms and localized electrons in iron

Write the formula for aluminum oxide.

Because rusting is a spontaneous process under standard conditions, which of the following is a correct conclusion about the process

What part of an atom cannot change without changing the atom's identity?

According to the general trend, metallic character for the periodic table (increases/decreases) proceeding from left to right in the periodic table.

A copper block (20°C) is placed in contact with a lead block (30°C), which is already in contact with an iron block (70°C).

Write a speech aimed at year 7 to explain why some metals lose their shine over time but gold does not.

How many moles of co2 could fit in a 475 ml bag at - 22c and 1.125 atm?

How mant atoms are in 3N2

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.

1.87 $/gal to dollars per liter, Express your answer using three significant figures.