CPC2 Review

Which model represents an ammonia molecule, NH3, where N is represented by a dark circle and H is represented by a light circle?

• A model with one dark circle and three light circles

• A model with two dark circles and two light circles

• A model with three dark circles and one light circle

• A model with four light circles

Tags

NGSS.MS-PS1-1

Which statement BEST describes this model?

• The model shows a single atom that is made of two molecules.

• The model shows a single molecule that is made of two atoms.

• The model shows a single atom that is made of three molecules.

• The model shows a single molecule that is made of three atoms.

Tags

NGSS.MS-PS1-1

Water is…

• an atom made of two compounds, 2 hydrogen and 1 oxygen.

• a solution made of two compounds, 2 hydrogen and 1 oxygen.

• a molecule made of three atoms, 2 hydrogen and 1 oxygen.

• an element made of three atoms, 2 hydrogen and 1 oxygen.

Tags

NGSS.MS-PS1-1

Iron is an element. What does an element of iron contain?

• one mixed substance of two different metals

• one kind of compound

• a simple mixture of different atoms

• a single type of atom

Tags

NGSS.MS-PS1-1

What are the reactants in this chemical equation? CH₄ + 2O₂ → CO₂ + 2H₂O

• CH₄ and O₂

• CO₂ and H₂O

• CH₄ and CO₂

• O₂ and H₂O

Tags

NGSS.MS-PS1-2

Is this chemical equation balanced or unbalanced? 4SO₄ + (NH₃)₂ ⟶ 6NO₂H + S₄

• balanced

• unbalanced

Tags

NGSS.MS-PS1-5

Which of the following diagrams represents a chemical change?

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why would a piece of wood float on water?

• wood is as dense as water

• wood has a higher density than water

• wood is less dense than water

• because of cohesion

The chart shows the densities of three different liquids. The three liquids are poured into a cylinder. List in order from top to bottom: Liquid X: 15.2 g/mL Liquid Y: 0.5 g/mL Liquid Z: 1.0 g/mL

• Liquid Y, Liquid Z, Liquid X

• Liquid X, Liquid Z, Liquid Y

• Liquid Z, Liquid Y, Liquid X

• Liquid X, Liquid Y, Liquid Z

Tags

NGSS.MS-PS1-2

Which process represents a chemical change?

• gold melting

• iron rusting

• water evaporating

• sugar crystallizing

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5