Pure Substances & Mixtures

1. A student copied down notes from their science teacher about three different types of substances. Somehow, the part of the page with the substance names got removed from the notebook. Can you help them correctly identify the substance names for the following three substances? 

• 1. Substance 1: Homogeneous mixture; Substance 2: Pure substance; Substance 3: Heterogeneous mixture 

• 1. Substance 1: Homogeneous mixture; Substance 2: Heterogeneous mixture; Substance 3: Pure substance 

• 1. Substance 1: Heterogeneous mixture; Substance 2: Pure substance; Substance 3: Homogeneous mixture 

• 1. Substance 1: Pure substance; Substance 2: Heterogeneous mixture; Substance 3: Homogeneous mixture 

2. Students were investigating mixtures. During the investigation, they were asked to mix four different types of substances. Which experiment result would show that a heterogeneous mixture was created?

• 1. Results 1 and 2 

• Results 2 and 3

• 1. Results 1 and 3 

• 1. Results 3 and 4 

When panning for gold, a miner scoops up gravel, rocks, and dirt, and then washes the mixture with water, leaving the gold behind. What is one reason the gold is easily separated from the gravel, rocks, and dirt? 

• 1. The gold is easily separated because the mixture is a pure substance. This means it is easily separated by physical means. 

• 1. The gold is easily separated because the mixture is a homogeneous mixture. This means it is easily separated by physical means. 

• 1. The gold is easily separated because the mixture is a heterogeneous mixture. This means it is easily separated by physical means. 

• 1. The gold is easily separated because the mixture is a solution. This means it is easily separated by physical means. 

Which of the following is NOT an example of a homogeneous mixture (solution)?

• 1. Sodium and chlorine chemically combine to create salt. 

• 1. Water and lemonade powder are mixed to create lemonade. 

• Salt is dissolved in water to create salt water.

• 1. Milk is poured into coffee and mixed. 

Which of the following is NOT a method used to determine if a substance is a mixture or a pure substance?

• Chemical separation

• 1. Evaporation 

• 1. Straining with a sieve 

• 1. Tweezers 

6. Which of the following properties are shared by homogeneous and heterogeneous mixtures? 

• 1. Option 1 

• 1. Option 2

• 1. Option 3

• 1. Option 4 

• 1. Option 5

• -Can easily be separated using physical means

• -Does not have a uniform appearance

• homogeneous mixture

• heterogeneous mixture

• pure substance

• -Cannot be separated using physical means

• -Has a uniform appearance

• homogeneous mixture

• heterogeneous mixture

• pure substance

• -Can be separated using physical means

• -Has a uniform appearance

• homogeneous mixture

• heterogeneous mixture

• pure substance

Which sections of the circle graph provided are considered pure substances?

• 1. Substance 1 and 2

• 1. Substance 2 and 3

• 1. Substance 3 and 4

• 1. Substance 1 and 3