Question

abigail, leiah, and kayla are working on a chemistry project for their science class. they need to select a pure substance from the following options for their experiment. which one should they choose?
4
sea water they collected during their field trip to the beach
table salt they purchased from the local grocery store
a loaf of bread they baked for a school fundraiser
garden soil from their schools community garden

Explanation:

Step1: Understand the concept of pure substances

A pure substance has a uniform and definite composition.

Step2: Analyze each option

• Sea water: A mixture of water, salts, and other substances.
• Table salt (purchased from the local grocery store): Usually sodium chloride (\(NaCl\)), a pure compound.
• A loaf of bread: A mixture of flour, water, yeast, etc.
• Garden soil: A mixture of minerals, organic matter, water, air, etc.

Answer:

Table salt they purchased from the local grocery store.