Question 1

Which of the following best describes a chemical change?

Accepted Answer

Burning propane to produce CO$$_2$$ and H$$_2O$$

Question 2

A sample of pure water is analyzed and found to contain 11.2 g of hydrogen and 88.8 g of oxygen. If another sample of pure water is analyzed, what will be the mass ratio of hydrogen to oxygen?

Accepted Answer

$$1:8$$

Question 3

Which property is intrinsic and does NOT depend on the amount of substance present?

Accepted Answer

Density

Question 4

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

Accepted Answer

Boiling water

Question 5

According to Dalton's atomic theory, which statement is FALSE?

Accepted Answer

Atoms are created and destroyed in chemical reactions

Question 6

A student measures the mass of a liquid as 25.0 g and its volume as 20.0 mL. What is the density of the liquid?

Accepted Answer

$$1.25\ \mathrm{g/mL}$$

Question 7

Which of the following best explains why the density of water is considered an intrinsic property?

Accepted Answer

It remains constant regardless of sample size

Question 8

Which statement about the Law of Conservation of Mass is correct?

Accepted Answer

Mass is neither created nor destroyed in chemical reactions

Question 9

A mixture of hydrocarbons in crude oil can be separated by which physical process?

Accepted Answer

Distillation

Question 10

Which of the following is a quantitative observation?

Accepted Answer

The mass of the sample is $$3.52\ \mathrm{g}$$

Question 11

If a student measures the mass of a sample as $$4.50\ \mathrm{g}$$, but the true value is $$4.35\ \mathrm{g}$$, what is the percent error?

Accepted Answer

$$3.45\%$$

Question 12

Which of the following is NOT a chemical property?

Accepted Answer

Boiling point

Question 13

Which statement about specific heat capacity is correct?

Accepted Answer

It is the amount of heat needed to raise the temperature of 1 g of a substance by $$1\ ^\circ\mathrm{C}$$

Question 14

Which of the following is a correct application of the Law of Multiple Proportions?

Accepted Answer

The ratio of the masses of elements in different compounds is a small whole number

Question 15

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how reproducible measurements are

Question 16

Which of the following is a correct statement about atoms according to Dalton's atomic theory?

Accepted Answer

Atoms of different elements have different masses

Question 17

A precipitation reaction occurs when:

Accepted Answer

Two solutions are mixed and a solid forms

Question 18

Which of the following is a correct formula for percent error?

Accepted Answer

$$\frac{\lvert 	ext{measured} - 	ext{true} vert}{	ext{true}} 	imes 100\%$$

Question 19

Which of the following is a correct statement about energy in chemical reactions?

Accepted Answer

Energy must be transferred and can be stored or released

Question 20

Which of the following is a correct statement about the charge of an electron?

Accepted Answer

$$-1.60 	imes 10$$^{-19}$$\ \mathrm{C}$$

Foundations of General Chemistry: Matter, Energy, and Atomic Theory

Guida di studio - Domande di pratica

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