Question

Which of the substances below can be described as a pure substance?
Responses

Silver (Ag
)
Silver (cap A g)

Smoothie
Smoothie

Flour
Flour

Baking Soda (NaHCO3
)

Answer 1

A pure substance is a material that has a constant composition and has consistent properties throughout the sample. Based on the substances you listed, the following can be classified as pure substances:

1. **Silver (Ag)** - This is a pure element, so it is a pure substance.
2. **Baking Soda (NaHCO3)** - This is a chemical compound with a defined formula and composition, making it a pure substance.

The other two options:

- **Smoothie** - This is a mixture of various ingredients and cannot be classified as a pure substance.
- **Flour** - This is also a mixture (e.g., wheat flour may contain various components, depending on processing), so it is not a pure substance.

In summary, the pure substances among your options are Silver (Ag) and Baking Soda (NaHCO3).