Science Tech

Which best describes an advantage of the model?

• The model shows that water exists as a solid, liquid, and gas.

• The model shows observable properties of water.

• The model shows how water interacts with other substances.

• The model shows parts of the molecule that are too small to see.

Tags

NGSS.MS-PS1-1

Lisa changes her model by adding another circle to represent oxygen as part of the molecule. How does this change what the model shows?

• The model now shows that water can change into new substances.

• The model now shows a larger water molecule.

• The model now shows a different kind of molecule.

• The model now shows that water molecules can have two oxygen atoms.

Tags

NGSS.MS-PS1-1

Which model would best demonstrate evidence of matter that cannot be seen?

• Blow up a balloon with helium gas.

• Burn a piece of paper to make ashes.

• Feel the heat given off by a lightbulb.

• Add water to a mixture of sand and gravel.

Tags

NGSS.MS-PS1-5

Jin knows that there is water in the air in the form of a gas. It is called water vapor. He also knows that when water vapor cools, it turns from a gas into a liquid. He decides to use a model to show that there is water in the air that people cannot see. He places a glass of cold ice water on a picnic table on a warm day. Jin lets the glass sit on the table for several minutes.

Which observation will show that there is water in the air that people cannot see?

• The ice in the glass will melt.

• Water droplets will form on the outside of the glass.

• Gas from the surrounding air will enter the glass.

• The water in the glass will get warmer.

Tags

NGSS.MS-ESS2-4

A hand lens, or magnifying glass, magnifies objects. Karen uses a hand lens to observe a rock. Which observation could Karen make using the hand lens?

• The rock is made of atoms.

• The rock contains different kinds of molecules.

• The rock is made of small grains of sand.

• The rock weighs about 2 kilograms.

Claire has a sample of matter and knows that the sample is one of the four substances in the table. Her sample is white and has a crystal appearance. Which two substances could Claire have?

• w

• x

• y

• z

Claire discovers that her sample does not form a solution. Can the sample now be identified based on the data in the chart?

• Yes, she can identify it as substance Y.

• No, she needs to know if it forms a conductive solution.

• Yes, she can identify it as substance Z.

• No, because more than one substance has the same properties.

Delaney has two samples of matter. She observes the samples with a hand lens and does not observe any differences in the two samples.

Which observations would identify the samples as two different kinds of matter? Select two correct answers.

• One sample is soluble in water and one sample is not.

• One sample has more mass than the other sample.

• One sample has a greater volume than the other sample.

• One sample forms bubbles in vinegar and one sample does not.

Tags

NGSS.MS-PS1-2