Pure Substances & Mixtures Quiz 2

Which material is a pure substance?

• mixture

• homogeneous

• compound

• solution

When you combine chocolate powder and milk, the result is best described as

• a mixture

• a compound

• an element

• a substance

Mom serves mixed vegetables, including peas, carrots, and corn, with dinner. This side dish is classified as a

• pure substance

• homogeneous

• compound

• heterogeneous

What is one characteristic of a sample of matter that indicates it is a pure substance?

• It can be separated using by a physical means, such as filtering.

• The components in a pure substance do not have to be in definite ratios.

• If the composition of a sample varies, the sample is a pure substance.

• If the composition of a sample is fixed, the sample is a pure substance.

Both __________ and __________ can be classified as pure substances because they have distinct properties and composition.

• electrons, protons

• elements, compounds

• atoms, element

• formulas, structure

Which image(s) would be considered pure substances?

• V

• I and II

• II and IV

• III and V

Brass is an alloy of copper and zinc. The two metals are melted, mixed, and then solidified. How would you BEST classify brass?

• pure substance: mixture

• heterogeneous mixture

• homogeneous mixture

• pure substance: compound

A mixture is what you get when you combine two substances in such a way that no chemical reaction occurs between the components. A solution is a mixture that looks exactly the same everywhere. Which of these mixtures is a solution?

• a fruit salad

• a mixture of sugar and salt

• a mixture of sugar and water

• a chocolate chip cookie

Taylor was thirsty and decided to mix up a pitcher of lemonade. She put lemon juice, water, and sugar into a pitcher and stirred it to create this wonderful new drink. How could Taylor decide if she just created a mixture or a compound?

• it must be a compound because it all looks the same

• if it were a compound, there would have been an explosion

• it must be a mixture as she can separate all of the individual ingredients

• it must be a compound as she can separate all of the individual ingredients

Elements are pure substances that make up all matter. Gold, aluminum, iron, and lead are some examples of these pure substances. What is the basic building block of all pure substances that make up matter in the world?

• compound

• atom

• mixture

• cell