Q: Which equation correctly converts Celsius to Fahrenheit?

$\text{F} = \frac{9}{5} \times \text{C} + 32$

Question 1

Which of the following best describes the arrangement and movement of atoms in a solid, as shown in the first image?

Accepted Answer

Atoms are packed closely in fixed locations and vibrate in place.

Question 2

Diamond and graphite are both forms of carbon. Based on the images provided, which statement best explains the difference between these two allotropes?

Accepted Answer

Diamond has carbon atoms arranged in a network of tightly bound layers, while graphite has carbon atoms arranged in sheets not bound to other sheets.

Question 3

Which property distinguishes a gas from a solid, as illustrated in the piston compression image?

Accepted Answer

Gases are compressible due to the large spaces between molecules, while solids are not compressible.

Question 4

A sample of matter is heated and changes from a solid to a liquid. Which type of change is occurring, and what evidence supports this?

Accepted Answer

Physical change; the state changes but the composition remains the same.

Question 5

Which separation technique would be most appropriate for separating a mixture of sand and water, as shown in the filtration image?

Accepted Answer

Filtration

Question 6

A mixture of two liquids with different boiling points is separated using the apparatus shown in the distillation image. What is the principle behind this separation?

Accepted Answer

The liquid with the lower boiling point evaporates first and is collected after condensation.

Question 7

Which of the following is an example of a physical change, as illustrated in the dry ice sublimation image?

Accepted Answer

Solid carbon dioxide (dry ice) subliming to gaseous carbon dioxide

Question 8

Which evidence would best indicate that a chemical change has occurred, as shown in the propane burning image?

Accepted Answer

Formation of new substances (carbon dioxide and water) from propane and oxygen

Question 9

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 10

A car burns gasoline, releasing energy that moves the car forward. Which type of energy transformation is primarily occurring?

Accepted Answer

Potential energy in gasoline molecules to kinetic energy of the car

Question 11

Which SI base unit is used to measure temperature?

Accepted Answer

Kelvin (K)

Question 12

Convert 40.00 ºC to Kelvin using the correct formula.

Accepted Answer

$K = 40.00 + 273.15$

Question 13

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture that appears to be one substance with uniform composition throughout.

Question 14

Which equation correctly converts Celsius to Fahrenheit?

Accepted Answer

$	ext{F} = \frac{9}{5} 	imes 	ext{C} + 32$

Question 15

Which of the following is an extensive property?

Accepted Answer

Mass

Question 16

A scientist measures the mass of a substance before and after a chemical reaction in a closed container and finds no change. Which law does this observation support?

Accepted Answer

Law of Conservation of Mass

Question 17

Which of the following is NOT a method for separating mixtures?

Accepted Answer

Combustion

Question 18

Which statement about the Kelvin scale is correct?

Accepted Answer

Kelvin scale assigns 0 K to the coldest temperature possible, called absolute zero.

Question 19

Which of the following is a derived unit in the SI system?

Accepted Answer

Newton (N)

Question 20

Which evidence would best indicate that a chemical reaction has occurred?

Accepted Answer

Formation of a precipitate

Chapter 1: Matter, Measurement, and Problem Solving – General Chemistry IA Study Notes

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