Q: Which of the following is the correct conversion factor to convert $1 \text{ in}^2$ to $\text{cm}^2$?

$(2.54)^2 \ \text{cm}^2 = 1 \ \text{in}^2$

Question 1

Which of the following best describes the difference between a scientific law and a scientific theory?

Accepted Answer

A law summarizes a series of related observations; a theory provides the underlying reasons for them.

Question 2

A sample of copper is heated from room temperature to $95^\circ \mathrm{C}$. The density of copper decreases as temperature increases. What happens to the sample?

Accepted Answer

The sample expands.

Question 3

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

Accepted Answer

Iron rusting in moist air.

Question 4

Which temperature scale has no negative values?

Accepted Answer

Kelvin

Question 5

A student measures the mass of a lead block five times and gets values close to each other, but all are far from the true value. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 6

Which of the following is a homogeneous mixture?

Accepted Answer

Sweetened tea

Question 7

Which of the following is an intensive property?

Accepted Answer

Density

Question 8

A sample of water is separated into hydrogen and oxygen. The ratio of the mass of oxygen to hydrogen is always approximately 8:1. This observation supports which law?

Accepted Answer

Law of definite proportions

Question 9

Which of the following is the correct formula to convert a temperature from Celsius to Kelvin?

Accepted Answer

$K = ^\circ C + 273.15$

Question 10

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

Accepted Answer

Filtration

Question 11

A student multiplies $2.52$, $12.054$, and $0.53$ in a calculation. How many significant figures should the final answer have?

Accepted Answer

2

Question 12

Which of the following is a pure substance that cannot be chemically broken down into simpler substances?

Accepted Answer

Element

Question 13

Which prefix multiplier is most appropriate for reporting a measurement of $5.57 	imes 10^{-6}$ m?

Accepted Answer

micro

Question 14

Which of the following best describes chemical energy?

Accepted Answer

Potential energy stored in the bonds of molecules

Question 15

A sample of a compound contains only carbon and oxygen. Which of the following statements is true?

Accepted Answer

It is a pure substance composed of two elements in fixed proportions.

Question 16

Which of the following is the correct conversion factor to convert $1 	ext{ in}^2$ to $	ext{cm}^2$?

Accepted Answer

$(2.54)^2 \ 	ext{cm}^2 = 1 \ 	ext{in}^2$

Question 17

A student records the following measurements for the mass of a sample: $5.12$ g, $5.13$ g, $5.11$ g, $5.12$ g. The true mass is $5.50$ g. Which of the following best describes the data?

Accepted Answer

Precise but not accurate

Question 18

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 19

Which of the following best explains why gases are compressible while solids are not?

Accepted Answer

Gases have a lot of space between their particles, allowing them to be compressed.

Question 20

A solution is prepared by dissolving $5.00$ g of salt in $100.0$ g of water. What type of matter is the resulting solution?

Accepted Answer

Homogeneous mixture

Matter, Measurement, and Problem Solving – CHEM 212 Study Notes

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