Mixtures and Properties

Hey Sophia, can you guess what (a)   means? It's “a combination of two or more substances that maintain their identities”.

• matter

• mixture

• solution

• compound

Answer explanation

The term "mixture" refers to a combination of two or more substances that retain their individual properties, unlike a "compound" where substances chemically combine. Therefore, the correct answer is "mixture".

Arjun and Kai are on a science adventure! They mixed iron filings with sand. (a)   shows that the ingredients in this mixture keep their cool physical properties.

• A magnet will separate the mixture.

• A liquid forms when the mixture is

• The temperature of the mixture decr

• The iron filings seem to disappear

Answer explanation

A magnet will separate the mixture because iron filings are magnetic, while sand is not. This demonstrates that the physical properties of the ingredients remain unchanged in the mixture.

Priya is hosting a salad-making contest and has prepared a delightful mix of ingredients. After mixing the 600 grams of veggies, 300 grams of dressing, 300 grams of croutons, she serves the salad in a fancy bowl. Can you guess the mass of the salad before and after serving?

• 300 grams before and 600 grams after

• 300 grams before and 900 grams after

• 1,200 grams before and 1,200 grams after

• 1,800 grams before and 1,800 grams after

Answer explanation

The total mass of the salad is the sum of all ingredients: 600g (veggies) + 300g (dressing) + 300g (croutons) = 1200g. The mass remains the same before and after serving, confirming the correct choice is 1,200 grams before and 1,200 grams after.

Tags

NGSS.MS-PS1-5

Emma and Ethan are on a science adventure, exploring how different substances interact with water. They carefully observe each reaction. Which substance keeps its original properties when mixed with water?

• A. salt

• B. sand

• C. sugar

Answer explanation

Sand retains its original properties when mixed with water, as it does not dissolve. In contrast, salt and sugar dissolve, changing their properties in the solution.

True or False: The components of a mixture keep their unique properties

• True

• False

Answer explanation

True. In a mixture, the individual components retain their unique properties, meaning they do not chemically combine and can be separated by physical means.

During a science experiment, Nora and Ethan are trying to separate a mixture using a magnet. Which of the following mixtures can they successfully separate?

• A. Sand and salt

• B. Iron filings and sand

• C. Sugar and water

Answer explanation

Nora and Ethan can successfully separate iron filings from sand using a magnet, as iron is magnetic while sand is not. The other mixtures, sand and salt or sugar and water, do not contain magnetic materials.

Avery and Kai are conducting a fun experiment with oil and water. They giggle as they watch the oil form a layer on top of the water. What property of oil and water causes this fascinating phenomenon?

• A. Density

• B. Color

• C. Temperature

Answer explanation

The phenomenon occurs due to density differences; oil is less dense than water, causing it to float on top. This property explains why they form distinct layers instead of mixing.

Isla and Kai are on a treasure hunt and need to separate a mixture of sand and iron filings to find the hidden key. Which method should they use?

• A. Filtration

• B. Evaporation

• C. Magnetic separation

Answer explanation

Isla and Kai should use magnetic separation because iron filings are magnetic, allowing them to be easily separated from the non-magnetic sand. Filtration and evaporation are not suitable for this mixture.

True or False: The components of a mixture keep their unique properties

• True

• False

Answer explanation

True. In a mixture, the individual components retain their unique properties, meaning they do not chemically combine and can be separated by physical means.

Think about the definition of mixture. Which of the following properties do all mixtures have? Select all that apply to mixtures

• made of parts that can be separated

• are considered pure substances

• made of parts that react chemically with each other

• are formed by physically combining two or more substances

• made of parts that cannot be separated

Answer explanation

All mixtures are formed by physically combining two or more substances and consist of parts that can be separated. They are not pure substances and do not necessarily react chemically.