Q: Which of the following is a correct application of dimensional analysis for converting $$2.5\ in to $$centimeters? (1 in = 2.54 cm)

$$2.5\ in \times \frac{2.54\ cm}{1\ in}$$

Question 1

Which of the following best defines chemistry?

Accepted Answer

The study of matter, its properties, and the changes it undergoes.

Question 2

Which statement correctly describes the scientific method?

Accepted Answer

It involves making observations, forming a hypothesis, conducting experiments, and developing theories or laws.

Question 3

Which of the following is an example of a physical change?

Accepted Answer

Water boiling to form steam.

Question 4

A sample of matter is uniform throughout and can be separated into two substances by a physical process. How is this sample best classified?

Accepted Answer

Homogeneous mixture

Question 5

Which separation technique would be most appropriate to separate a mixture of sand and water?

Accepted Answer

Filtration

Question 6

Which of the following is a derived SI unit?

Accepted Answer

Joule

Question 7

Convert 25.0 °C to Kelvin. Use the equation $$K = ^\circ C + 273.15.$$

Accepted Answer

$$298.15\ K$$

Question 8

Which of the following statements about energy is correct?

Accepted Answer

Thermal energy is a form of kinetic energy.

Question 9

A block of aluminum has a mass of $$54.0\ g$$ and a volume of $$20.0\ cm^3$. What is its density? Use the equation d$$ = \frac{m}{V}$$.

Accepted Answer

$$2.70\ g/cm^3$

Question 10

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 11

How many significant figures are in the measurement $$0.004560\ m$$?

Accepted Answer

4

Question 12

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom.

Question 13

A student measures the mass of a sample three times and gets values that are very close to each other but far from the true value. This is an example of:

Accepted Answer

Low accuracy, high precision

Question 14

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

Micro-

Question 15

Convert $$5.00\ km to $$meters. (1 km = 1000 m)

Accepted Answer

$$5000\ m$$

Question 16

Which of the following best describes a chemical property?

Accepted Answer

The ability of iron to rust.

Question 17

Which law states that energy cannot be created or destroyed, only transformed?

Accepted Answer

Law of Conservation of Energy

Question 18

A solution is prepared by dissolving $$10.0\ g of $$salt in $$90.0\ g of $$water. Which statement is correct?

Accepted Answer

The solution is a homogeneous mixture.

Question 19

Which of the following is a correct application of dimensional analysis for converting $$2.5\ in to $$centimeters? (1 in = 2.54 cm)

Accepted Answer

$$2.5\ in 	imes \frac{2.54\ cm}{1\ in}$$

Question 20

Which of the following best describes a Bose-Einstein Condensate?

Accepted Answer

A state of matter where atoms behave as a single quantum entity at temperatures near absolute zero.

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