IB Chemistry Option A

Which is an appropriate unit for the rate of a reaction?

• mol dm^-3 s

• mol dm^-3 s^-1

• mol dm^-3

• s

Tags

NGSS.HS-PS1-5

What is the best definition of rate of reaction?

• The time it takes to use up all the reactants

• The rate at which all the reactants are used up

• The increase in concentration of a product per unit time

• The time it takes for one of the reactants to be used up

Tags

NGSS.HS-PS1-5

The value of K_c for the reaction between hydrogen and bromine in the gas phase to produce hydrogen bromide is 4.0 x 10^-2. What is the value of K_c for dissociation of gaseous hydrogen bromide into hydrogen and bromine?

• 4.0 x 10^-2

• 2.0 x 10^-2

• 25

• 400

The reaction between bromine and ethene in the dark is an example of:

• free radical substitution

• esterification

• nucleophilic substitution

• addition

Which compound is an ester?

• CH₃COOH

• CH₃OCH₃

• C₂H₅CHO

• HCOOCH₃

What is the general formula of the alkyne series?

• C_nH_n

• C_nH_2n-2

• C_nH_2n

• C_nH_2n+2

What is the mechanism of the reaction between ethane and chlorine in sunlight?

• Free radical substitution

• Free radical addition

• Electrophilic substitution

• Electrophilic addition

A compound decolorizes bromine water in the dark. Which statement is correct?

• It contains C=C and is an alkene.

• It contains C–C and is an alkene.

• It contains C=C and is an alkane.

• It contains C–C and is an alkane.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which compound could be X in the two-stage reaction pathway?

C₂H₄ → X → C₂H₅OH

• C₂H₆

• C₂H₃OH

• C₂H₅Br

• C₂H₄Cl₂

Applying IUPAC rules, what is the name of the compound?

• 1-ethyl-1,3-dimethylbut-2-ene

• 2-ethyl-4-methylpent-3-ene

• 2-methyl-4-ethylpent-3-ene

• 2,4-dimethylhex-2-ene