KERBOODLE PRACTICE QUESTIONS: DF

Question 1

The amount of energy needed to raise 1kg of a substance by 1^oC is called its:

A) heat capacity

B) thermal capacity

C) molar heat capacity

D) specific heat capacity

Answer 1

D) specific heat capacity

Question 2

Which answer is correct?

A) bond-making
endothermic
+ΔH

B) bond-breaking
exothermic
-ΔH

C) bond-making
exothermic
+ΔH

D) bond-breaking
endothermic
+ΔH

Answer 2

D) bond-breaking
endothermic
+ΔH

Question 3

10cm³ of 2.0 moldm^-3 NaOH is mixed with 10cm³ 2.0mol dm^-3 H₂SO₄. The temperature rises by y^oC.

The enthalpy change of neutralisation of the reaction of NaOH with H₂SO₄ (in kJ) is given by:

A) 4.18y

B) 4.18 x y/2

C) 20 x 4.18y

D) 15 x 4.18 x y/2

Answer 3

A) 4.18y

Amount of NaOH = 0.02 mol
H₂SO₄ is in excess

energy transferred = 20 x 4.18 x /1000 kJ
per mol of H₂O = per mol of NaOH
= 20 x 4.18 x y/1000 x 0.02
= 4.18y

Question 4

Chloroethene has the formula of CH₂==CHCl
Poly(chloroethene) can be represented as:

A) —(CH₃CH₂Cl)—

B) —(CHClCHCl)—

C) —(CHCHCl)—

D) —(CH₂CHCl)—

Answer 4

B) —(CHClCHCl)—

Question 5

Which of the following cannot be formed from ethene in a one-step reaction?

A) CH₂BrCH₂Br

B) CH₃CHBr₂

C) CH₃CH₂OH

D) CH₃CH₂Br

Answer 5

D) CH₃CH₂Br

A - has to many hydrogen atoms. B - has too many

Question 6

Which of the following might be found in the exhaust when hydrogen burns in an internal combustion engine?

A) NO_x

B) CO

C) hydrocarbons

D) SO₂