7.6 Review

Using the periodic table, which elements are present in the formula CaCO₃?

• carbon and cobalt

• calcium and cobalt

• calcium, carbon, and oxygen

• carbon, actinium, and oxygen

Tags

NGSS.MS-PS1-1

Samantha learned that honey is a saturated solution of glucose and fructose dissolved in water. Which describe solute(s) and solvent(s) in the honey solution?

• Fructose is the solvent and water is the solute.

• Water is the solvent and glucose is the only solute.

• Water is the solvent and glucose and fructose are the solutes.

• Fructose is the solvent and water and glucose are the solutes.

Shelby sorted different types of changes into the categories of chemical change and physical change. Which phrase describes a chemical change?

• boiling a pot of water

• tearing paper into small pieces

• fruit rotting and giving off a smell

• sugar crystalizing out of solution as water evaporates

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Compare and contrast the substances shown in terms of their atoms and structures. Which substance is a molecule but NOT a compound?

• water

• oxygen

• glucose

• silver

Tags

NGSS.MS-PS1-1

Using the diagrams as models, how can your answer choice in the previous question be explained?

• The substance has chemical bonds between atoms and only one type of atom.

• The substance has no chemical bonds between atoms and only one type of atom.

• The substance has chemical bonds between atoms and more than one type of atom.

• The substance has no chemical bonds between atoms and more than one type of atom.

Tags

NGSS.MS-PS1-1

Which substances can be broken down into simpler substances?

• water vapor (H2O)

• gold wire (Au)

• lead weight(Pb)

• table salt (NaCl)

Tags

NGSS.MS-PS1-5

Which substances cannot be broken down into simple substances?

• gold wire (Au)

• lead weight (Pb)

• table salt (NaCl)

• Carbon (C)

Physical and chemical changes can be identified based on various observations of changes in objects. Which observation can be done to a piece of paper and be considered a physical change.

• cut in half

• soaked in water

• painted from white to red

• set on fire and burned

Physical and chemical changes can be identified based on various observations of changes in objects. Which observation can be done to a piece of paper and be considered a chemical change?

• painted from red to white

• interacts with acid and turns yellow

• set on fire and burned

• soaked in water

Tags

NGSS.MS-PS1-2

Loren and Bailey are investigating how agitation of a solution affects the rate of dissolution. They are making a data table to record their results. Which column titles should be used in their data table to determine how agitation affects the rate of dissolution? Choose TWO correct answers.

• amount of solute

• amount of solvent

• number of stirs per minute

• time when no solid is visible

• temperature of the solution