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Chemistry µIB
1.1 Particles + Chemical Change
10 quick questions



10 minutes maximum!


1. Which of the following statements about mixtures is true?
  • A.   Mixtures have a fixed composition
  • B.   Differences in physical properties are used to separate components of a mixture
  • C.   The components in a mixture are chemically combined
  • D.   Mixtures can be represented by a chemical formula
2. Which of the following is NOT a homogeneous mixture?
  • A.   oil and water
  • B.   stainless steel
  • C.   ethanol and water
  • D.   unpolluted air

3. Which of the following changes of state are exothermic?

I. evaporation
II. sublimation
III. freezing
  • A.   II only
  • B.   III only
  • C.   I and II only
  • D.   II and III only

 What is the sum of the coefficients when the following equations are balanced using the smallest possible whole numbers?

4.    __BaCl2  + __NaOH    __Ba(OH)2  +  __NaCl
  • A.   4
  • B.   5
  • C.   6
  • D.   7
5.    __C4H10  +  __O2    __CO2  +  __H2O
  • A.   16
  • B.   17
  • C.   32
  • D.   33
6.     __Fe3O4   +   __H2       __Fe   +   __H2O
  • A.   8
  • B.   11
  • C.   12
  • D.   14
7. What is the name given to the change of state represented by the following equation?

    CO2(g)      CO2(s)

  • A.   condensation
  • B.   deposition
  • C.   freezing
  • D.   sublimation

8. Which of the following occur as steam condenses to water?

I. The kinetic energy of the particles increases
II. The distance between the particles increases
III. The temperature remains constant
  • A.   I and II only
  • B.   I and III only
  • C.   II and III only
  • D.   III only

9. Which of the following graphs best represents the cooling curve when a pure substance with a melting point of 50°C is cooled from 75°C to room temperature?

cooling curve graphs x4

10. Which of these changes of state is endothermic?
  • A.   H2O(g)    H2O(l)
  • B.   CO2(s)    CO2(g)
  • C.   Na(l)    Na(s)
  • D.   C10H8(g)    C10H8(s)