Chemical Reactions

Chemical properties of a substance include all of the following except..

• its boiling point 
• its toxicity 
• its flammability 
• its reactivity 

The toxicity of a substance refers to ..

• its ability to burn ie catch on fire 
• its ability to react quickly with other substances 
• how its affects your health 
• its ability to explode 

A metal like copper is said to be ductile. This means it can be ... 

• corroded easily
• bent into wires 
• heat up and conduct heat
• bent into sheets 

Which of the following is a chemical change rather than a physical change 

• boiling water at 100 C
• chopping up a piece of wood. 
• cooking a cake 
• ice carbon dioxide sublimating to gas 

Tags

NGSS.MS-PS1-2

Some hydrochloric acid is added to marble chips in a test tube. The students observed bubbles and fizzing. The gas is ....

• Oxygen gas 
• Carbon dioxide 
• Hydrogen gas 
• nitrogen gas 

Tags

NGSS.MS-PS1-2

Some hydrochloric acid is added to marble chips in a test tube. The marble chips is....

• Lead nitrate 
• Calcium carbonate  
• sodium carbonate 
• calcium oxide  

In the above reaction, to test for the gas I could ...

• Bubble it through limewater and it will go milky 
• do the pop test and it will burn 
• Light a taper and it will burn brighter
• note the colour change to yellow 

In another reaction, the student places a piece of metal into a test tube and adds an acid again. Its fizzes ..
The gas produced is called...

• nitrogen 
• Oxygen gas
• sulphur dioxide 
• Hydrogen gas 

The process going from a gas to a liquid is called ...

• evaporation 
• melting 
• condensation 
• sublimation 

The only way you can be certain that a chemical reaction has occured is by? 

• Light has been emitted 
• a colour change has occurred 
• bubbles appear 
• identifying one or more new chemical products