Chemical Bonding — Cumulative exam Answers

What does a triple-beam balance require the user to do?

A cylinder at left with balls in a layer on the bottom of the cylinder has an arrow leading to a cylinder at right with balls stacked near the bottom of the cylinder.

An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?

Who was the first chemist to organize elements by atomic number?

Gerard lives in a tropical region where the average annual temperature is 77°F and the average annual rainfall is more than 100 inches a year. He surveys 25 people in his neighborhood about items they regularly use and records the data into a table.

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

Which element is least likely to form chemical bonds?

Two scientists write a paper detailing their research and conclusions and submit it to a scientific journal. Several months later, the publisher sends them back the paper. Many comments from several fellow scientists are attached. Which step will the authors of the paper most likely take next?

What best describes the states of nonmetals when they are at room temperature?

This is how manganese appears in the periodic table.

Students are studying the changing concentration of carbon dioxide levels in different substances. They insert sensors into each substance and allow a device to graph the results.What are the students most likely using?

Luther accidentally spilled his chemicals, and they splashed onto his arm and legs. Which piece of equipment should he use?

Atoms of iron (Fe) form metallic bonds with other iron atoms. How are the valence electrons of these atoms rearranged to form the bonds?

Why is matter so diverse in its properties and characteristics?

Which describes the correct procedure when converting a number from scientific notation to standard notation?

Calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive?

Fluorine has an atomic number 9. It is in period 2 of the periodic table. The diagram shows the electron dot diagram of a fluorine atom.

Scientists often work on projects for a long time and fail to see sources of error in their research. Which process allows an outside expert to look at the scientist’s project and point to sources of error?

During which changes of state do atoms that cannot move past one another become free to move?

Which example illustrates public scientific communication?