6.5 ABC

Which of the following correctly represents an element?

• Water- H2O

• Copper- Cu

• Carbon Monoxide- CO

• Salt- NaCl

Which of the following is a compound?

• Co

• Fe

• H

• CO

Tags

NGSS.MS-PS1-1

Which of the following statements are characteristics of a compound?

• I, III

• IV

• I, II. IV

• II, III, IV

Tags

NGSS.MS-PS1-1

Compounds are pure substances. What other substances are considered pure substances?

• Chemical reactions

• Elements

• Mixtures

• Solutions

Mixing silver nitrate and sodium chloride in water will cause silver chloride to precipitate out

of solution. In this example, the precipitate is silver chloride.

Which example represents the formation of a precipitate?

• Heat and light are produced when paper burns.

• White chunks form when you add vinegar to milk or heavy cream.

• Gas is released when vinegar and baking soda are mixed together.

• A cut apple turns brown when left out in the open air.

Tags

NGSS.MS-PS1-2

Water has the chemical formula H2O. Which statement correctly describes water?

• Water is not a pure substance, but is an element.

• Water is a pure substance and an element.

• Water is a pure substance and a compound.

• Water is not a pure substance, but is a compound.

Tags

NGSS.MS-PS1-1

Which example provides evidence of a chemical change?

• Wood releases ash and smoke when burned.

• Rock particles separate when soil is being sifted.

• Boiling water bubbles when being heated.

• Sugar is not visible when dissolved in water.

Tags

NGSS.MS-PS1-2

Two liquids are mixed together. Which of the following does NOT identify the formation of a

new substance?

• A gas is produced.

• One liquid dissolves into the other.

• The temperature changes.

• A solid is formed.

Tags

NGSS.MS-PS1-2

A student had a beaker with a small amount of baking soda. The student added a few drops

of pickle juice to the baking soda and observed fizzing and bubbling.

Based on observation, which of these can the student conclude?

• A chemical reaction produced a solid.

• No chemical reaction took place.

• Only a physical change happened.

• A chemical reaction produced a gas.

Tags

NGSS.MS-PS1-2

What do the letters Na and Cl represent in the chemical formula NaCl?

• Mixtures

• Compounds

• Elements

• Molecules

Tags

NGSS.MS-PS1-1