HW #3

The number of elements known today is around

100

A chemical change always involves a change in the ______ of a piece of matter.

Composition

Which of the following approaches is an example of green chemistry?

Designing a product that degrades in the environment to produce by-products that have less toxicity than the original product.

What companies sell chemical products?

Exxon Mobil, Apple, Wal-Mart Stores

What would increase the rate of a chemical reaction?

Increasing the temperature

Which statement in regards to a mole of carbon is incorrect?

It contains 12 atoms of carbon; Correct: It weighs 12.0107g, It contains the Avogadro's number of carbon atoms,It is a quantity of carbon.

Which pair of elements has the most similar chemical properties?

Li & Na; Elements within a group or family have similar properties. Groups are identified by the numbers at the top of the columns in the periodic table. Examples include Group 1A the alkali metals or Group 8A the noble gases. Only elements Li and Na are in the same family or group in the periodic table. Elements in the same family have the same number of valence electrons and thus have similar chemical properties

What is the relationship between the number of elements and the number of compounds is correct?

The number of compounds is much larger than the number of elements.

Sea-Nine is an antifoulant that reduces impacts compared to Tributyltin Oxide during which stage or stages of the life cycle for a ship?

Use and End of Life

Sea-Nine was a technology that won a Presidential Green Chemistry Challenge Award. This award program is important for sustainable product development because it...

raises the visibility of chemical strategies that enable companies to reduce the impact on human health and the environment for the products they create