Chem Unit 3 Lesson 2

Question 1

Law of Constant Composition is ?

Answer 1

a compound will always contain the same elements in the same fixed mass ratio

Question 2

What does Percentage Composition refers to?

Answer 2

the percentage (by mass) of each
element in a compound

Question 3

What is an empirical formula?

Answer 3

a formula that shows the simplest
whole-number ratio of elements in a compound ( reduced form)

Question 4

A Molecular formula is?

Answer 4

A formula that shows the element symbols in the exact number of each type of atom in a molecular compound

Question 5

The law of conservation was first proposed by?

Answer 5

by French chemist Joseph Proust in 1799

Question 6

What is alloy?

Answer 6

mixture of different metals blended together to form useful products

Question 7

An example of an alloy is?

Answer 7

brass is an alloy of copper and zinc; stainless steel is an alloy of iron and
chromium

Question 8

Unlike compounds, percent compositions of alloys can___

Answer 8

Vary
(stainless steel cutlery usually contains about 10% chromium, where as surgical stainless steel contains
about 18% chromium)