Metric&Dimen
What is the abbreviation of Milligram?
Mg
The mass of an object is 150 grams, and its volume is 30 cm³. What is its density?
5 g/cm³
(Density = Mass / Volume = 150 g / 30 cm³ = 5 g/cm³)
How many significant figures are in the number 0.004506?
c) 4
(The digits 4, 5, 0, 6 are significant; leading zeros are not.)
Which of the following is a chemical property?
a) Density
b) Solubility
c) Ability to rust
d) Melting point
c) Ability to rust
Ice is what state of matter?
Solid
Convert 500 milliliters (mL) to liters (L).
0.5 L
A material has a density of 3.2 g/cm³. What would be the volume of 256 grams of this material?
80 cm³
(Volume = Mass / Density = 256 g / 3.2 g/cm³ = 80 cm³)
How many significant figures are in the number 0.00934?
3
(The digits 9, 3, 4 are significant; leading zeros are not significant.)
When a piece of wood is cut into smaller pieces, which type of change occurs?
Physical change
What phase of matter has a definite shape and a definite volume?
Solid
How many kilometers (km) are in 5,000 meters (m)?
0.5 km
What is the definition of density?
physical property of matter that describes how much mass is contained in a given volume
What is the result of (0.005 × 12.35)?
0.0618
(When multiplying, the answer has as many significant figures as the number with the least number of sig figs. 0.005 has 1 sig fig and 12.35 has 4 sig figs, so the result should have 1 sig fig.)
What is the physical property of water?
Freezing point
Which of the following is a property of gases?
a) Gases have a definite shape but not a definite volume.
b) Gases can expand to fill any container.
c) Gases have a definite volume but not a definite shape.
d) Gases are incompressible.
Gases can expand to fill any container.
Convert 5 hours to seconds.
5,400 seconds
(1 hour = 60 minutes, 1 minute = 60 seconds → 5 hours × 60 minutes/hour × 60 seconds/minute = 5,400 seconds)
How much heat energy is required to raise the temperature of 2 kg of water by 10°C? The specific heat capacity of water is 4,186 J/kg°C.
41,860 J
(Q = mcΔT = 2 kg × 4,186 J/kg°C × 10°C = 41,860 J)
What is the result of 125.06 + 7.1?
132.2
(When adding, round to the least number of decimal places. 7.1 has 1 decimal place, so the answer must have 1 decimal place.)
A sample of a gas is placed in a rigid, sealed container. Over time, the gas reacts with the container walls and forms a new substance. What is the best description of this situation?
Chemical change of the gas
(The gas forms a new substance after reacting with the container, which is a chemical change.)
What happens to the particles in a substance when it changes from a solid to a liquid?
a) The particles move closer together and vibrate more.
b) The particles move farther apart and become less ordered.
c) The particles stay in fixed positions, but vibrate more.
d) The particles remain in fixed positions and do not change.
b. the particles move farther apart and become less ordered.
(When a solid melts, the particles move farther apart, and their arrangement becomes less ordered.)
A tank has a volume of 0.25 cubic meters. How many liters is this?
1 cubic meter = 1,000 liters
250 L
(1 cubic meter = 1,000 liters → 0.25 m³ × 1,000 = 250 L)
What is the heat energy required to raise the temperature of 0.5 kg of water from 10°C to 40°C? The specific heat capacity of water is 4,186 J/kg°C.
62,790 J
(Q = mcΔT = 0.5 kg × 4,186 J/kg°C × 30°C = 62,790 J)
What is the result of 4.56 × 10⁵ + 7.8 × 10⁴?
5.4 × 10⁵
(When adding numbers in scientific notation, round to the least number of decimal places. 4.56 × 10⁵ has 2 decimal places and 7.8 × 10⁴ has 1 decimal place. Therefore, the result should be rounded to 1 decimal place.)
Which of the following best describes the dissolution of salt (NaCl) in water?
a) It is a chemical change because the ions in salt break apart in the solution.
b) It is a chemical change because the water molecules interact with the salt.
c) It is a physical change because the salt dissolves without changing its chemical composition.
d) It is a chemical change because the salt reacts with the water molecules.
c) It is a physical change because the salt dissolves without changing its chemical composition.
At what point does a substance transition from a liquid to a gas?
a) Freezing point
b) Boiling point
c) Melting point
d) Sublimation point
b) Boiling point
(When a liquid reaches its boiling point, it transitions into a gas through the process of boiling.)