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Physical Behavior of Matter - Unit 5 Regents Chemistry Flashcards | StudBud
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Physical Behavior of Matter - Unit 5 Regents Chemistry
Physical Behavior of Matter - Unit 5 Regents Chemistry
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1
0.125g of glucose is dissolved in water to make 250. g of solution. The solution's concentration in parts per million is
5.00 × 104 ppm
5.00 × 103ppm
5.00 × 101 ppm
5.00 × 102 ppm
2
Which substance forms an unsaturated solution when 80. grams of it are stirred into 100. grams of H2O at 10°C?
NH3
KI
NaCl
KNO3
3
During which timeinterval does the substance exist as both a liquid and a solid?
min 2 to min 4
min 7 to min 9
min 5 to min 7
min 4 to min 5
4
Based on Table F, which equation represents a saturated solution having the lowest concentration of Cl– ions?
KCl(s) ⇌ K+(aq) + Cl–(aq)
AgCl(s) ⇌ Ag+(aq) + Cl–(aq)
NH4Cl(s) ⇌ NH4+(aq) + Cl–(aq)
NaCl(s) ⇌ Na+(aq) + Cl–(aq)
5
What happens to the number of solute particles in solution and the boiling point of a solution as more solute dissolves?
The number of solute particles decreases & the boiling point increases
The number of solute particles increases & the boiling point decreases
The number of solute particles increases & the boiling point increases
The number of solute particles decreases & the boiling point decreases
6
Distillation is a process used to separate a mixture of liquids based on different
boiling points
solubilities
densities
freezing points
7
A syringe contains a sample of H2 gas at 330. K, 150. kPa and 3.50 L. What would its volume be at STP?
1.96 L
0.233 L
6.26 L
4.29 L
8
Which statement describes a mixture of sand and water at room temperature?
It is homogeneous, and its components are in the same phase.
It is homogeneous, and its components are in different phases.
It is heterogeneous, and its components are in the same phase.
It is heterogeneous, and its components are in different phases.
9
Which statement describes the particles of an ideal gas, based on the kinetic molecular theory?
The gas particles' volume is negligible compared to the total gas volume.
There are attractive forces between the particles.
The collisions between the particles reduce the total energy of the gas.
The particles move in circular paths.
10
If the Kelvin temperature of a gas in a syringe is doubled while pressure is held constant, the gas's volume is
halved
tripled
doubled
unchanged
11
What is the molarity of 2.0 liters of an aqueous solution that contains 0.50 mole of potassium iodide, KI?
0.25 M
2.0 M
0.50 M
1.0 M
12
A solution contains 25 g of KI dissolved in 200. grams of H2O. Which numerical setup calculates the percent by mass of K
(200g / 225 g) x 100
(25g / 175 g) x 100
(25g / 200 g) x 100
(25g / 225 g) x 100
13
What is the vapor pressure of propanone at 50.°C?
50. kPa
37 kPa
101 kPa
83 kPa
14
The temperature of a substance is a measure of the __________ of its particles.
ionization energy
average kinetic energy
average potential energy
activation energy
15
Which phrase describes this change? Br2(l) → Br2(g)
exothermic physical change
exothermic chemical change
endothermic physical change
endothermic chemical change
16
Which particle diagram represents a sample of oxygen gas at STP?
B
A
C
D
17
At which temperature and pressure would a sample of helium behave most like an ideal gas?
600 K and 50. kPa
150 K and 500. kPa
75 K and 500. kPa
300 K and 50. kPa
18
At which temperature will Hg( ) and Hg(s) reach equilibrium in a closed system at 1.0 atmosphere?
273 K
630 K
234 K
373 K
19
A student separates compounds from crushed leaves using chromatography. The compounds separate due to differences in
malleability
electrical conductivity
boiling point
molecular polarity
20
At STP, which gas sample has the same number of molecules as 2.0 liters of CH4(g) at STP?
2.0 liter of O2(g)
1.0 liter of C2H6(g)
6.0 liter of CO2(g)
5.0 liter of N2(g)
21
During which two processes does a substance release energy?
evaporation and condensation
freezing and condensation
freezing and melting
evaporation and melting
22
The table below shows four different gas samples at 100. kPa. Which two gas samples contain equal numbers of atoms?
neon and krypton
helium and neon
neon and argon
helium and argon
