Liam, Mason, and Aiden are on a science adventure to discover the relative density of some mysterious small items. Which fun experiment should they try?

• Insert each item into the open wires of a circuit, and see which items cause the circuit’s light bulb to light up.

• Place each item on a balance scale and determine the mass of each item in grams.

• Insert each item into a tub of water and see which items sink and which items float.

Answer explanation

To determine relative density, placing items in water shows if they sink or float. Sinking indicates higher density than water, while floating indicates lower density. This method directly assesses density through buoyancy.

Ava, Elijah, and Mia are working together in their science lab to find the best material to insulate electrical wires. They tested four different materials and recorded their results in the table below. Based on their data, which material should they choose to keep the wires safe from electricity?

• Material A

• Material B

• Material C

Answer explanation

Material B is the best insulator for electrical wires as it has the lowest electrical conductivity among the tested materials, which means it effectively prevents the flow of electricity, reducing the risk of short circuits.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Kai and Evelyn are on a science adventure! They find an iron nail and a steel key. Which TWO properties do these objects have in common?

• Electrical conductors

• Less dense than water

• Magnetic

Answer explanation

The objects are electrical conductors, allowing the flow of electricity, and they are also magnetic, meaning they can attract or repel magnets. These two properties are common among the observed objects.

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Olivia, Arjun, and Ava are on a science adventure! They observed the properties of different objects and wrote down their findings in the table below. Can you help them figure out which property of matter they can use to split these objects into two groups?

Object | Observations
plastic bead | green, floats in water, non-magnetic
metal block | silver, sinks in water, non-magnetic
rubber eraser | non-magnetic, blue, floats in water
marble | clear, non-magnetic, sinks in water

• Solubility

• Relative density

• Magnetism

Answer explanation

The objects can be separated based on relative density, as some float in water (plastic bead, rubber eraser) while others sink (metal block, marble). This property distinguishes them into two groups effectively.

Tags

NGSS.5-PS1-3

Henry, Sophia, and William are working together in the lab and accidentally mix iron filings with sand. Which tool should they use to best separate their mixture and save the day?

• Magnet

• Strainer or sieve

• Paper filter

Answer explanation

A magnet is the best tool to separate iron filings from sand because iron is magnetic, while sand is not. The magnet will attract the iron filings, allowing for easy separation from the non-magnetic sand.

Ava, Priya, and Aiden are helping in the kitchen and find a strainer just like the one in the picture! Which of these mixtures can they separate most easily using the strainer?

• Marbles and plastic cubes

• Dish soap and water

• Pebbles and sand

Answer explanation

Pebbles and sand can be separated easily using a strainer because the pebbles are larger and will not pass through the holes, while the sand will. This makes it a straightforward physical separation method.

Grace, Aria, and Olivia are helping their teacher make lemonade for a class party! They stir lemon juice and sugar into water to make a tasty drink. When the sugar dissolves in the lemonade, which property of the sugar stays the same?

• A. Taste

• B. Color

• C. None of the above

Answer explanation

The taste of sugar remains the same when dissolved in lemonade. While it may change form, its sweet flavor is unchanged, making 'A. Taste' the correct choice. The color of sugar does not affect its taste.

Tags

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Nora, Anika, and Aiden decided to become mixture detectives! They created several different mixtures in science class. Can you help them out? Choose TWO mixtures in which all of the ingredients keep their physical properties.

• Mixture 1

• Mixture 2

• Mixture 3

• Mixture 4

Answer explanation

Mixture 2 and Mixture 4 are correct because they consist of ingredients that do not chemically react and retain their individual physical properties, unlike mixtures that form new substances.

Benjamin and Abigail are doing a fun science experiment! They put grapes and salt into a plastic bottle filled with water. After giving it a good shake, they watch closely to see what happens. Which of these materials will mix and form a solution with the water?

• Plastic

• Salt

• None of the above

Answer explanation

Salt will dissolve in water, forming a solution, while plastic does not interact with water in this way. Therefore, the correct choice is salt.

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NGSS.MS-PS1-2

David and Benjamin are making lemonade. What happens when they mix lemon juice with water?

• The volume of the water decreases.

• The lemon juice dissolves and spreads evenly throughout the water.

• The lemon juice floats on top of the water.

Answer explanation

When lemon juice is combined with water, it dissolves and spreads evenly throughout the water, creating a uniform solution. This is the correct change that occurs, unlike the other options which are incorrect.

Tags

NGSS.MS-PS1-2