Properties of Water

A student finds the mass and volume of four mystery liquids. The data is provided. The student knows that the density of water is 1 g/mL. Which of the four mystery liquids can be correctly identified as water?

• W

• X

• Y

• Z

Scenario:

In science class students use gumdrops to model atoms and molecules. Different colors of gumdrops represent different types of atoms. They use toothpicks to combine atoms to make molecules.

The table shows some of the models created by the students.

What are the red molecules shown in the picture?

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Tags

NGSS.MS-PS1-1

Why is water classified as a compound?

• Because it is an element, which consists of only one type of atom.

• Because it is a substance, which can easily be separated.

• Because it is a substance composed of two or more kinds of atoms bonded together.

• Because it is an unevenly mixed solution, or a heterogeneous mixture.

Tags

NGSS.MS-PS1-1

Which substance is composed of more than one element?

• water

• carbon

• gold

• sodium

Tags

NGSS.MS-PS1-1

When water freezes in the ocean, the ice floats to the surface. What property explains this phenomenon?

• water expands when it freezes, making ice less dense than water

• water compacts when it freezes, making ice more dense than water

• hydrogen bonds in water push the ice to the surface

• ice is afraid of water, and avoids it

What is the chemical formula for water?

Tags

NGSS.MS-PS1-1

Which property of water allows it to dissolve many substances?

• Cohesion

• Adhesion

• Polarity

• Viscosity

What is the boiling point of water at standard atmospheric pressure?

• 0°C

• 100°C

• 50°C

• 200°C

Tags

NGSS.MS-PS1-4

Why does ice float on water?

• Ice is denser than water

• Ice is less dense than water

• Ice has more mass than water

• Ice has less volume than water

What is the pH level of pure water?

• 0

• 7

• 14

• 5