Mixture & Pure Substances, Acids, and Bases

To prepare for a lab in science class, Cheryl is mixing 20 grams of table salt (NaCl) into a beaker of 100 mL of water.  She now needs to explain her procedures in making the solution in her science notebook. Which of the following terms should she use to describe the dissolved substance in the solution?

• Solute

• Mole

• Solvent

• Suspension

Marjorie has learned that the substances in a mixture retain their physical properties, therefore the mixture can be separated back into the original components.  Which of the following would be a way to recover salt that has been dissolved in water?

• by evaporating the water

• by filtering the salt solution

• by pouring off the upper part of the solution

• by siphoning off the lower part of the solution

In science class, Melanie and Olivia have been learning about homogeneous and heterogeneous mixtures. Their teacher has asked them to find an example of each type of mixture and create it for the class. Which of the following is the best example to use to demonstrate a heterogeneous mixture?

• Lemonade made of water, lemonade powder mix, and sugar.

• An omelet made of scrambled eggs and cheddar cheese.

• Trail mix made of raisins, peanuts, and chocolate candies.

• A glass of ice water made of ice cubes and pure water.

For generations, the Johnson family has passed down a recipe for salad dressing. This morning, Emily made the family recipe for her mother’s surprise birthday dinner. She notices that each time before someone used the salad dressing, they needed to shake the bottle before pouring. When they set the bottle down, she could observe the ingredients of the salad dressing separating. Given Emily’s observations of the salad dressing, which of the terms below BEST describes the salad dressing?

• Mixture

• Element

• Solution

• Compound

A dish is given to you, which contains a blackish-yellow powder. When you move a magnet over it, you are amazed to see black iron particles fly upwards and get stuck to the magnet, and all that's left in the dish is a yellow powder, which you discover to be sulfur.  Was your original powder an element, compound or mixture?

• Element

• Compound

• Mixture

Apple juice is an example of a(n) ________.

• Compound

• Heterogeneous Mixture

• Homogeneous Mixture

• Colloid

What type of mixture has easily seen, separate parts?

• Colloid

• Homogeneous mixture

• Solution

• Heterogeneous Mixture

Which of the following does NOT describe a solution?

• It is a mixture

• It has the same properties throughout.

• It contains a solvent and a solute.

• It contains large particles that settle out.

Which of the following is an example of a homogeneous mixture?

• Chicken noodle soup

• Trail mix

• Carbon dioxide

• Tomato soup

Air, which makes up Earth’s atmosphere, is considered

• a mixture

• an element

• a compound

• a pure substance