Unit 5 assessment - Reactions

Look at the statements below. Select the statement that shows a chemical reaction has taken place.

• A solid substance will melt.

• Bubbles appear in the substance

• The substance dissolves when being stirred in water

Look at the picture of the student performing the experiment. Identify the correct set of safety rules she is following.

• Wearing safety goggles, Using her fingers to identify the solution, Using a test tube rack

• Hair tied back, Using a test tube rack , Wearing a lab coat

• Wearing a lab coat, Hair tied back , Wearing Safety goggles

• Wearing safety goggles, Hair tied back, Using a test tube rack

When using liquids they may be dangerous. Choose the name of the type hazard for the description below.

Could cause slight swelling or redness on the skin.

• Irritant

• Corrosive

When using liquids they may be dangerous. Choose the name of the type of hazard for the description below.

Could burn skin and eyes.

• Irritant

• Corrrosive

A neutral substance has a pH level that will be

• Greater than 7

• Less than 7

• Equal to 7

A alkali substance will have a pH level

• Greater than 7

• Less than 7

• Equal to 7

A acid will have a pH level

• Greater than 7

• Less than 7

• Equal to 7

Complete the sentence below by selecting the correct word.

When a metal or non metal reacts with oxygen an .............. is formed

• Oxate

• Oxide

• Oxlate

• Oxo

Complete the sentence below by inserting the correct word.

At room temperature (20C), metal oxides are mostly ...............

• Solids

• Liquids

• Gases

Complete the sentence below by inserting the correct word

At room temperature (20C) non metal oxides are mostly ..................

• Solids

• Liquids

• Gases