Q. 3.3 - An Introduction to General, Organic, and Biological Chemistry

Question

3.3. Classify each of the following as a pure substance or a mixture:

a. baking soda $\left({\mathrm{NaHCO}}_3\right)$

b. a blueberry muffin

c. ice $\left({\mathrm{H}}_2\mathrm{O}\right)$

d. zinc ($Zn$)

e. trimix (oxygen, nitrogen, and helium) in a scuba tank

Step-by-Step Solution

Answer

a. The substance is a Compound

b. The substance is a  Element

c. The substance is a Compound

d. The substance is a Element

e. The substance is a Compound

Step 1: Given information (a)

(a) As a Pure substance or a mix of baking soda $\left({\mathrm{NaHCO}}_3\right)$

Step 2: Explanation (a)

(a) The given substance is baking soda $\left({\mathrm{NaHCO}}_3\right)$. The substance contains the weather sodium $\left(Na\right)$, hydrogen $\left(H\right)$, carbon $\left(C\right)$, and oxygen $\left(O\right)$. It contains four elements combined together during a fixed proportion of mass. Hence, the substance may be a compound.
Hence, the substance could be a pure substance 

Step 3: Given information (b)

(b) As a Pure substance or a mix of a blueberry muffin

Step 4: Explanation (b)

(b) The given substance could be a blueberry muffin. The muffin is created from blueberries, sugar, milk, and water. Hence, it's mixture of the many ingredients (substance).
The blueberry muffin may be a mixture.

Step 5: Given Information (c)

As a Pure substance or a mix of Ice$\left(H_{2}O\right)$

Step 6: Explanation (c)

(c) The given substance is ice. Ice may be a solid style of water $\left(H_{2}O\right)$. The proportion of hydrogen to oxygen gas is$2:1$. Hence, it's a compound. Ice may be a pure substance. 

Step 7: Given information (d)

As a Pure substance or a mix of Zinc $\left(Zn\right)$

Step 8: Explanation (d)

(d) The given substance is zinc $\left(Zn\right)$. It contains only a zinc atom. Hence, the substance is a part.
The given substance of zinc may be a pure substance. 

Step 9: Given information (e)

(e) As a Pure substance or a mix of trimix (oxygen, nitrogen, and helium) in a scuba tank

Step 10: Explanation (e)

(e) The given substance is trimix (oxygen, nitrogen, and helium) during a scuba tank. It contains oxygen, nitrogen, and helium, which aren't chemically combined together. The given substance could be a mixture.