Mixtures

Dana is trying to determine if an unknown sample is a pure substance or not. The sample has a cloudy white color, and it seems evenly mixed throughout. The sample is a liquid with high viscosity (thickness). Dana tried separating the sample with a magnet with no effect. When Dana filtered the sample, larger granules of the sample were left behind in the filter.

What evidence allowed Dana to conclude that the sample is not a pure substance?

• It is a cloudy white.

• The liquid has high viscosity

• Dana tried separating the sample with a magnet with no effect.

• Dana filtered the sample and larger granules of the sample were left behind

Which of the following correctly describes pure substances

• Pure substances exist only as solids.

• Pure substances are found only in nature.

• Pure substances have a fixed composition of elements

• Pure substances can be separated into individual elements by physical means.

Which statement best describes the air in Earth's atmosphere?

• A pure substance made of one kind of gas

• a solution of gases that are physically mixed

• a compound made of two or more kinds of gases

• A mixture of two gases that are chemically combined

Sugar is added to iced tea and the contents are stirred until all of the sugar dissolves. How would the tea now be classified?

• It is a solution

• It is an element.

• It is a compound

• It is a pure substance

Which characteristic applies to all mixtures, including solutions?

• Mixtures must be composed of compounds

• Mixtures are composed of a single element

• Mixtures are composed of two or more substances.

• Mixtures have uniform structures throughout entire samples.

Part of Todd's dinner was salad dressing, soup, salt, and cake.

COMPOSITION OF SOME DINNER ITEMS

Dinner Item Ingredients

Salad dressing oil and vinegar,

physically combined

Soup vegetables and broth,

physically and chemically

combined

Salt sodium and chloride,

chemically combined

Cake sugar, baking powder, flour,

and eggs,

physically and chemically

combined

Which of the following dinner items is a pure substance?

• Salad Dressing

• Soup

• Salt

• Cake

Which of these is NOT an example of a pure substance?

• Aluminum Can

• Milk

• Table Salt

• Water

Tags

NGSS.MS-PS1-4

The picture below shows Kelsey's glass of ice water.

Which of the following is correct about Kelsey's glass of ice water?

• It is a mixture now because the water and ice can be seen in the glass, but it will not be a mixture when the ice cubes melt.

• It is not a mixture now because the ice is floating on the water, but it will be a mixture when the ice cubes melt.

• It is not a mixture because ice and water are the same thing in two different states.

• It is a mixture because ice and water are two different things in two different states.

The picture shows four liquids: tea, water, orange juice, and fruit punch. Which of the liquids are mixtures?

• Tea, Orange juice, and Fruit punch

• Orange juice and Fruit punch, only

• Tea, Water, and Fruit punch

• Water and Tea, only

Mr. Johnson is teaching his students about mixtures. He decides to mix sand and iron filings to see whether his students can determine the best way to separate the iron from the sand. The best way for Mr. Johnson's students to separate this mixture is by

• running a magnet through the mixture.

• adding water to the mixture

• Shaking the mixture.

• freezing the mixture