Page 20 - Surviving Chemistry BFF Homework Helper and Test Prep Preview

Questions for Regents Practice Matter, Energy & Changes

Parts A and B-1 Multiple Choice

1. One similarity between all mixtures and compounds is that both
1) Are heterogeneous 3) Combine in definite ratios
2) Are homogeneous 4) Consist of two or more substances

2. Which correctly describes particles of a substance in the gas phase?
1) Particles are arranged in a regular geometric pattern and are far apart
2) Particles are in a fixed rigid position and are close together

3) Particles move freely in a straight path
4) Particles move freely and are close together.

3. When a substance evaporates, it is changing from

1) Liquid to gas 2) Gas to liquid 3) Solid to gas 4) Gas to solid

.
4. The specific heat capacity of water is 4.18 J/ g K . Adding 4.18 Joules of heat to
a 1-gram sample of water will cause the water to
1) Change from solid to liquid 3) Change its temperature 1K

2) Change from liquid to solid 4) Change its temperature 4.18 K

5. Real gases differ from ideal gases because the molecules of real gases have
1) Some volume and no attraction for each other

2) Some volume and some attraction for each other
3) No volume and no attraction for each other

4) No volume and some attraction for each other

6. Under which two conditions do real gases behave most like an ideal gas?
1) High pressure and low temperature 3) High pressure and high temperature
2) Low pressure and high temperature 4) Low pressure and low temperature

7. At constant pressure, the volume of a confined gas varies
1) Directly with the Kelvin temperature 3) Directly with the mass of the gas
2) Indirectly with the Kelvin temperature 4) Indirectly with the mass of the gas

8. Which statement describes a chemical property of iron?

1) Iron can be flattened into sheets. 3) Iron conducts electricity and heat.
2) Iron combines with oxygen to form rust. 4) Iron can be drawn into a wire.

9. Which sample at STP has the same number of molecules as 5 liters of NO 2(g) at

STP?
1) 5 grams of H2(g) 3) 5 moles of O2(g)
23
2) 5 liters of CH 4(g) 4) 5 × 10 molecules of CO 2(g)

10. Which substance can be decomposed by a chemical change?
1) Helium) 2) Potassium 3) Aluminum 4) Ammonia

11. Molecules of which substance have the lowest average kinetic energy?

o
1) NO(g) at 20 C 3) NO2 at 35 K
o
2) NO 2(g) at -30 C 4) N 2O 3 at 110 K

12. At STP, the difference between the boiling point and the freezing point of water

in the Kelvin scale is
1) 373 2) 273 3) 180 4) 100

13. A real gas will behave most like an ideal gas under which conditions of

temperature and pressure?
o
o
o
1) 0 C and 1 atm 2) 0 C and 2 atm 3) 273 C and 1 atm 4) 273 C and 2 atm
o
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