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In a chemical equation, what are the reactants?

1. AThe catalysts written above the arrow
2. BThe starting substances, written to the left of the arrow
3. CThe new substances formed, written to the right of the arrow
4. DThe numbers written in front of each formula

A cleaning solution has a pH of 12. How is it described?

1. AWeakly acidic
2. BStrongly basic
3. CNeutral
4. DStrongly acidic

In a solution, what is the solvent?

1. AThe substance that does the dissolving, usually present in the larger amount
2. BAny solid that will not dissolve, however long it is stirred
3. CThe substance that is dissolved, usually present in the smaller amount
4. DThe gas given off when a solid dissolves

How many grams are in 2,5 kg?

1. A250 g
2. B25 g
3. C0,0025 g
4. D2500 g

What feature makes a hydrocarbon an alkene?

1. AA ring of six carbon atoms with no hydrogen
2. BAt least one carbon–carbon double bond
3. COnly carbon–carbon single bonds
4. DAn –OH group

Senyawa apa yang terbentuk antara kalsium (Ca²⁺) dan klorin (Cl⁻)?

1. ACaCl
2. BCa₂Cl₃
3. CCaCl₂
4. DCa₂Cl

10 g suatu zat dilarutkan dalam air hingga menjadi 250 mL larutan. Berapa konsentrasinya dalam g/L?

1. A40 g/L
2. B25 g/L
3. C0,04 g/L
4. D2,5 g/L

Many ethene (C₂H₄) molecules join together to form poly(ethene), a plastic. What type of reaction is this?

1. AHydrolysis, in which water breaks each monomer apart
2. BAddition polymerisation, in which the C=C double bonds open up to link the monomers
3. CCondensation polymerisation, in which a water molecule is released at each new link
4. DCombustion, in which ethene reacts with oxygen