Law of Definite Proportions

Question 1

The percent by mass of sodium in table salt (NaCl) is 39.34 %. What is the percent by mass of chlorine?

Answer 1

60.66%

Question 2

Will the composition of water vary depending on its source?

Answer 2

NO

Question 3

Water is 11.19% hydrogen and 88.81% oxygen by mass. Lake Superior contains about 1.2×10^16 kg of water. What mass of hydrogen is contained in Lake Superior?

Answer 3

1.3x10^15kg

Question 4

A given chemical compound always contains the same elements in the exact same proportions by mass is the law of _____.

Answer 4

Definite Proportions

Question 5

A chemical compound is always found to be made up of the same elements combined together in different proportions by mass.

Answer 5

False

Question 6

Identify the law that explains the following observation: Nitrogen dioxide can be formed by reacting 14 grams of nitrogen with 32 grams of oxygen.

Answer 6

The Law of Definite Proportions

Question 7

In carbon dioxide, 12 grams of carbon combines with 16 grams of oxygen.

Answer 7

False

Question 8

A chemical compound is always found to be made up of the same elements combined together in the same fixed proportion by mass. This is known as the:

Answer 8

Law of Definite Proportions

Question 9

The law of definite proportions is only applicable when the elements which are reacting together form the same product.

Answer 9

True

Question 10

Every molecule of carbon dioxide consists of 1 atom(s) of carbon and 2 atom(s) of oxygen.

Answer 10

True