Ezekiel And Rehan UNIT 2 quiz

Which of the following is NOT a general property related to the location of an element in the periodic table?

• Alkali metals

• Halogens

• Noble gases

• Covalent bonds

What do the columns of the periodic table represent?

• Groups or families with elements that have different properties

• Individual elements with unique properties

• Groups or families with elements that have similar properties

• The periodic law of elements

What is the significance of the structure of substances in relation to electrical forces?

• It determines the color of the substance.

• It determines the strength of electrical forces between particles.

• It has no significance in relation to electrical forces.

• It determines the temperature at which a substance melts.

How does the functioning of designed materials depend on their structure at the molecular level?

• It depends on the color and texture of the materials.

• It depends on the electrical conductivity of the materials.

• It depends on the molecular-level structure.

• It depends on the size of the materials.

What must chemists organize according to the introduction?

• Compounds

• Mixtures

• Elements

• Reactions

What does the current organization of elements allow us to do?

• Predict chemical reactions

• Understand the history of chemistry

• Predict things about elements that are not yet discovered

• Organize chemical laboratories

By the end of the 1700's, approximately how many elements had been discovered?

• 15

• 30

• 60

• 45

Which new laboratory technique in the early 1800's allowed the discovery of more elements?

• Chemical reactions

• Atomic spectroscopy

• Microscopic analysis

• Thermal conductivity

Approximately how many elements were discovered by the early 1800's using new laboratory techniques like atomic spectroscopy?

• About the same number as in the 1700's

• About twice the number they had in the 1700's

• About half the number they had in the 1700's

• About three times the number they had in the 1700's

¿Qué químico alemán de principios del siglo XIX descubrió que algunos elementos podían agruparse en lo que él llamó Triadas (grupos de tres)?

• Dmitri Mendeléyev

• Antoine Lavoisier

• J.W. Döbereiner

• John Dalton