Recap of Y7 Chemical Reactions

In the chemical reaction shown, what are the products?

• copper sulfate, magnesium, magnesium sulfate and copper

• copper sulfate and magnesium

• magnesium sulfate and copper

• Copper is the only product

In this reaction, the copper sulfate and the magnesium are called the...

• Producers

• Reactants

• Starters

• Reactors

What is the meaning of the arrow in the middle of a word equation? Choose the BEST description.

• "combine to make"

• "equals"

• "goes to"

• "react to form"

Magnesium chloride is a salt with similarities to table salt (sodium chloride). One way to make magnesium chloride is simply to react two elements together.

What is the name of the element missing from the word equation? (Take care with spelling.)

During a chemical reaction, bubbles may be formed. This shows that at least one of the products of this reaction is a ..........

Which TWO of these substances are soluble in water?

• flour

• sodium chloride (table salt)

• glucose (a sugar)

• stainless steel

• sand

What risk is associated with this bottle of dilute sulfuric acid?

• It may irritate skin or eyes, causing pain or a rash

• It may catch fire easily

• It may cause severe skin burns

• If it touches you it may cause damage to your nervous system

A few acids, e.g. citric acid, come in solid form.

But usually the acid particles come dissolved in water. This is called a ........................ of the acid.

In a displacement reaction, one element is replaced by another.

The reaction shown works because...

• magnesium is more reactive than copper

• copper is more reactive than magensium

• copper sulfate is a solution but magnesium sulfate is a solid

• None of these

Which of the following particle pictures could represent a displacement reaction?

• A

• B

• C

• None of these