KS3 Energy & Material Changes

Baking a cake by mixing flour, sugar, chocolate powder, eggs, and milk, and then heating them in the oven is an example of a/an .........

• Chemical Change
• Physical Change

Which of the following is NOT an example of a physical change?

• crumpling up a piece of paper
• sharpening a pencil 
• clothes shrinking when they are washed
• milk turning sour

Which of the following is NOT an example of chemical change?

• milk turning sour
• burning wood
• breaking a pencil
• rusting of iron

In chemical reactions, the law of conservation of mass is......

• always disobeyed
• never true
• always obeyed
• sometimes correct

The Law of Conservation of Mass tells us matter cannot  ______________.

• change colour
• change from one state of matter to another
• be created or destroyed
• change temperature

Which type of  chemical reaction is the following an example of :  
Na + CaF₂ --> Ca + NaF

• Decomposition
• Single Replacement
• Synthesis
• Double Replacement

During reactions of metals with acids  energy is released. What kind of reaction is this?

• Physical
• Exothermic
• Endothermic
• Photothermic

Which of the following IS a clue that a chemical change has occurred? 

• State of matter change
• Size Change
• Change in temperature
• Shape change

Tags

NGSS.MS-PS1-2

Which of the following is an example of synthesis?

• Na + Br₂ --> NaBr
• KClO₃ --> KCl + O₂
• HgO + Cl₂-->HgCl + O₂
• Cl₂ + NaBr --> NaCl + Br₂

Tags

NGSS.MS-PS1-5

Identify this type of reaction,
Cl₂ + 2KI _-->  I₂ + 2KCl

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition